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Dual Channel, 12-Bit, 80 MSPS A/D Converter with Analog Input Signal Conditioning AD13280
and performance while still maintaining excellent isolation, and providing for significant board area savings. Multiple options are provided for driving the analog input, including single-ended, differential, and optional series filtering. The AD13280 also offers the user a choice of analog input signal ranges to further minimize additional external signal conditioning, while still remaining general purpose. The AD13280 operates with 5.0 V for the analog signal conditioning with a separate 5.0 V supply for the analog-to-digital conversion, and 3.3 V digital supply for the output stage. Each channel is completely independent allowing operation with independent encode and analog inputs, and maintaining minimal crosstalk and interference. The AD13280 is packaged in a 68-lead ceramic gull wing package. Manufacturing is done on Analog Devices, Inc. MIL-38534 Qualified Manufacturers Line (QML) and components are available up to Class-H (-40C to +85C). The components are manufactured using Analog Devices, Inc. high-speed complementary bipolar process (XFCB).
PRODUCT HIGHLIGHTS
FEATURES Dual, 80 MSPS Minimum Sample Rate Channel-to-Channel Matching, 1% Gain Error 90 dB Channel-to-Channel Isolation DC-Coupled Signal Conditioning 80 dB Spurious-Free Dynamic Range Selectable Bipolar Inputs ( 1 V and 0.5 V Ranges) Integral Single-Pole Low-Pass Nyquist Filter Two's Complement Output Format 3.3 V Compatible Outputs 1.85 W per Channel Industrial and Military Grade APPLICATIONS Radar Processing (Optimized for I/Q Baseband Operation) Phased Array Receivers Multichannel, Multimode Receivers GPS Antijamming Receivers Communications Receivers PRODUCT DESCRIPTION
The AD13280 is a complete dual channel signal processing solution including on board amplifiers, references, ADCs, and output termination components to provide optimized system performance. The AD13280 has on-chip track-and-hold circuitry and utilizes an innovative multipass architecture to achieve 12-bit, 80 MSPS performance. The AD13280 uses innovative highdensity circuit design and laser-trimmed thin-film resistor networks to achieve exceptional channel matching, impedance control,
1. Guaranteed sample rate of 80 MSPS. 2. Input signal conditioning included; gain and impedance match. 3. Single-ended, differential, or off-module filter options. 4. Fully tested/characterized full channel performance. 5. Compatible with 14-bit (up to) 65 MSPS family.
FUNCTIONAL BLOCK DIAGRAM
AMP-IN-A-2 AMP-IN-A-1 AMP-IN-B-2 AMP-IN-B-1
AMP-OUT-A A-IN A+IN DROUTA (LSB) D0A D1A D2A D3A D4A D5A D6A D7A D8A TIMING 9 VREF DROUT 12 100 OUTPUT TERMINATORS 3 100 VREF DROUT 12 OUTPUT TERMINATORS 7 5
AMP-OUT-B
AD13280
B+IN B-IN
DROUTB ENC TIMING ENC D11B (MSB) D10B D9B D8B D7B D9A D10A D11A (MSB) D0B D1B D2B D3B D4B D5B (LSB) D6B
ENC ENC
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2001
AD13280-SPECIFICATIONS
Parameter RESOLUTION DC ACCURACY No Missing Codes Offset Error Offset Error Channel Match Gain Error2 Gain Error Channel Match
1
(AVCC = +5 V, AVEE = -5 V, DVCC = +3.3 V; applies to each ADC with Front-End Amplifier unless otherwise noted.)
Temp Test Level Mil Subgroup Min AD13280AZ/BZ Typ Max 12 Full 25C Full Full 25C Full 25C Max Min IV I VI VI I VI I VI VI 12 1 2, 3 1, 2, 3 1 2, 3 1 2 3 Guaranteed 1.0 1.0 0.1 -1.0 2.0 0.5 1.0 1.0 Unit Bits
-2.2 -2.2 -1.0 -3 -5.0 -1.5 -3.0 -5
+2.2 +2.2 +1.0 +1 +5.0 +1.5 +3.0 +5
% FS % FS % % FS % FS % % %
SINGLE-ENDED ANALOG INPUT Input Voltage Range AMP-IN-X-1 AMP-IN-X-2 Input Resistance AMP-IN-X-1 AMP-IN-X-2 Capacitance Analog Input Bandwidth3 DIFFERENTIAL ANALOG INPUT Analog Signal Input Range A+IN to A-IN and B+IN to B-IN 4 Input Impedance Analog Input Bandwidth ENCODE INPUT (ENC, ENC)1 Differential Input Voltage Differential Input Resistance Differential Input Capacitance SWITCHING PERFORMANCE Maximum Conversion Rate 5 Minimum Conversion Rate 5 Aperture Delay (tA) Aperture Delay Matching Aperture Uncertainty (Jitter) ENCODE Pulsewidth High at Max Conversion Rate ENCODE Pulsewidth Low at Max Conversion Rate Output Delay (tOD) Encode, Rising to Data Ready, Rising Delay SNR1, 6 Analog Input @ 10 MHz
Full Full Full Full 25C Full
V V IV IV V V 12 12 99 198
0.5 1.0 100 200 4.0 100 101 202 7.0
V V pF MHz
Full 25C Full Full 25C 25C Full Full 25C 25C 25C 25C 25C Full Full 25C Min Max 25C Min Max 25C Min Max 25C Min Max 25C Min Max 25C Min Max
V V V IV V V VI IV V IV V IV IV V V I II II I II II I II II I II II I II II I II II 12 0.4
1 618 50
V MHz V p-p k pF MSPS MSPS ns ps ps rms ns ns ns ns dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS
10 2.5 4, 5, 6 12 12 12 12 4.75 4.75 80 20 1.5 250 0.3 6.25 6.25 5 8.5 70 500 8 8
Analog Input @ 21 MHz
Analog Input @ 37 MHz
4 6 5 4 6 5 4 6 5 4 6 5 4 6 5 4 6 5
67.5 64.5 67.5 67.5 64 67.5 63.5 61.5 63.5 67 63.5 67 65 63 65 54.5 53 54.5
70
65
SINAD1, 7 Analog Input @ 10 MHz
69
Analog Input @ 21 MHz
68.5
Analog Input @ 37 MHz
59
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Parameter SPURIOUS-FREE DYNAMIC RANGE Analog Input @ 10 MHz
1, 8
Temp 25C Min Max 25C Min Max 25C Min Max 25C 25C 25C 25C 25C Min Max 25C 25C 25C 25C
Test Level I II II I II II I II II V V V V I II II V V IV V
Mil Subgroup 4 6 5 4 6 5 4 6 5
Min 75 70 75 68 67 68 56 55 56
AD13280AZ/BZ Typ Max 80
Unit dBFS
Analog Input @ 21 MHz
75
dBFS
Analog Input @ 37 MHz
62
dBFS
SINGLE-ENDED ANALOG INPUT Passband Ripple to 10 MHz Passband Ripple to 25 MHz DIFFERENTIAL ANALOG INPUT Passband Ripple to 10 MHz Passband Ripple to 25 MHz TWO-TONE IMD REJECTION 9 fIN = 9.1 MHz and 10.1 MHz f1 and f2 are -7 dB fIN = 19.1 MHz and 20.7 MHz f1 and f2 are -7 dB fIN = 36 MHz and 37 MHz f1 and f2 are -7 dB CHANNEL-TO-CHANNEL ISOLATION 10 TRANSIENT RESPONSE DIGITAL OUTPUTS11 Logic Compatibility DVCC = 3.3 V Logic "1" Voltage Logic "0" Voltage DVCC = 5 V Logic "1" Voltage Logic "0" Voltage Output Coding POWER SUPPLY AVCC Supply Voltage12 I (AVCC) Current AVEE Supply Voltage12 I (AVEE) Current DVCC Supply Voltage12 I (DVCC) Current ICC (Total) Supply Current per Channel Power Dissipation (Total) Power Supply Rejection Ratio (PSRR)
0.05 0.1 0.3 0.82 4 6 5 4 4 12 90 25 CMOS 75 71 75 80
dB dB dB dB dBc
77 60
dBc dBc dB ns
Full Full Full Full
I I V V
1, 2, 3 1, 2, 3
2.5
DVCC - 0.2 0.2 0.5 DVCC - 0.3 0.35 Two's Complement
V V V V
Full Full Full Full Full Full Full Full Full
IV I IV I IV I I I V
4.85 1, 2, 3 -5.25 1, 2, 3 3.135 1, 2, 3 1, 2, 3 1, 2, 3
5.0 310 -5.0 38 3.3 34 369 3.72 0.01
5.25 338 -4.75 49 3.465 46 433 4.05
V mA V mA V mA mA W % FSR/% VS
NOTES 1 All ac specifications tested by driving ENCODE and ENCODE differentially. Single-ended input: AMP-IN-X-1 = 1 V p-p, AMP-IN-X-2 = GND. 2 Gain tests are performed on AMP-IN-X-1 input voltage range. 3 Full Power Bandwidth is the frequency at which the spectral power of the fundamental frequency (as determined by FFT analysis) is reduced by 3 dB. 4 For differential input: +IN = 1 V p-p and -IN = 1 V p-p (signals are 180 out of phase). For single-ended input: +IN = 2 V p-p and = -IN = GND. 5 Minimum and maximum conversion rates allow for variation in Encode Duty Cycle of 50% 5%. 6 Analog Input signal power at -1 dBFS; signal-to-noise ratio (SNR) is the ratio of signal level to total noise (first five harmonics removed). Encode = 80 MSPS. SNR is reported in dBFS, related back to converter full scale. 7 Analog Input signal power at -1 dBFS; signal-to-noise and distortion (SINAD) is the ratio of signal level to total noise + harmonics. Encode = 80 MSPS. SINAD is reported in dBFS, related back to converter full scale. 8 Analog Input signal at -1 dBFS; SFDR is ratio of converter full scale to worst spur. 9 Both input tones at -7 dBFS; two tone intermodulation distortion (IMD) rejection is the ratio of either tone to the worst third order intermod product. 10 Channel-to-channel isolation tested with A channel grounded and a full-scale signal applied to B Channel. 11 Digital output logic levels: DV CC = 3.3 V, C LOAD = 10 pF. Capacitive loads > 10 pF will degrade performance. 12 Supply voltage recommended operating range. AV CC may be varied from 4.85 V to 5.25 V. However, rated ac (harmonics) performance is valid only over the range AVCC = 5.0 V to 5.25 V. Specifications subject to change without notice.
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL1 AVCC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 7 V AVEE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 V to 0 V DVCC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 7 V Analog Input Voltage . . . . . . . . . . . . . . . . . . . . . VEE to VCC Analog Input Current . . . . . . . . . . . . . . -10 mA to +10 mA Digital Input Voltage (ENCODE) . . . . . . . . . . . . . 0 to VCC ENCODE, ENCODE Differential Voltage . . . . . . . . 4 V max Digital Output Current . . . . . . . . . . . . . . -10 mA to +10 mA ENVIRONMENTAL2 Operating Temperature (Case) . . . . . . . . . -40C to +85C Maximum Junction Temperature . . . . . . . . . . . . . . . . 175C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 300C Storage Temperature Range (Ambient) . . -65C to +150C
NOTES 1 Absolute maximum ratings are limiting values applied individually, and beyond which the serviceability of the circuit may be impaired. Functional operability is not necessarily implied. Exposure to absolute maximum rating conditions for an extended period of time may affect device reliability. 2 Typical thermal impedance for "ES" package: JC 2.2C/W; JA 24.3C/W.
PIN CONFIGURATION 68-Lead Ceramic Leaded Chip Carrier (ES-68C)
AMP-OUT-A A+IN B+IN AMP-OUT-B AMP-IN-A-2 AMP-IN-A-1 AMP-IN-B-1 AMP-IN-B-2
SHIELD AGNDB
AGNDA
A-IN AGNDA
AGNDA
AGNDB
9
8
7
6
5
4
3
2
1 68 67 66 65 64 63 62 61 PIN 1 IDENTIFIER 60 59 58 57 56 55 54
AGNDA 10 AV EEA 11 AV CCA 12 AGNDA 13 ENCODEA 14 ENCODEA 15 AGNDA 16 DV CCA 17 NC 18 NC 19 D0A(LSB) 20 D1A 21 D2A 22 D3A 23 D4A 24 D5A 25 DGNDA 26
AGNDB
B-IN
AGNDB AV EEB AV CCB AGNDB ENCODEB ENCODEB
AD13280
TOP VIEW (Not to Scale)
AGNDB DV CCB 52 D11B(MSB) 51 D10B
53 50 49 48 47 46 45 44
D9B D8B D7B D6B D5B D4B DGNDB
TEST LEVEL
I
100% Production Tested.
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
DROUTB NC NC
D1B D2B
D3B
D10A D11A(MSB)
SHIELD
II 100% Production Tested at 25C, and sample tested at specified temperatures. AC testing done on sample basis. III Sample Tested only. IV Parameter is guaranteed by design and characterization testing. V Parameter is a typical value only. VI 100% production tested with temperature at 25C: sample tested at temperature extremes.
ORDERING GUIDE
NC = NO CONNECT
Model AD13280AZ AD13280AF 5962-0053001HXA AD13280/PCB
Temperature Range (Case) -25C to +85C -25C to +85C -40C to +85C 25C
Package Description 68-Lead Ceramic Leaded Chip Carrier 68-Lead Ceramic Leaded Chip Carrier with Nonconductive Tie-Bar 68-Lead Ceramic Leaded Chip Carrier Evaluation Board with AD13280AZ
D0B(LSB)
DROUTA
DGNDA
Package Option ES-68C ES-68C ES-68C
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD13280 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
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DGNDB
D6A
D7A D8A D9A
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PIN FUNCTION DESCRIPTIONS
Pin No. 1, 35 2, 3, 9, 10, 13, 16 4 5 6 7 8 11 12 14 15 17 18, 19, 37, 38 20-25, 28-33 26, 27 34 36 39-42, 45-52 43, 44 53 54, 57, 60, 61, 67, 68 55 56 58 59 62 63 64 65 66
Name SHIELD AGNDA A-IN A+IN AMP-OUT-A AMP-IN-A-1 AMP-IN-A-2 AVEEA AVCCA ENCODEA ENCODEA DVCCA NC D0A-D11A DGNDA DROUTA DROUTB D0B-D11B DGNDB DVCCB AGNDB ENCODEB ENCODEB AVCCB AVEEB AMP-IN-B-2 AMP-IN-B-1 AMP-OUT-B B+IN B-IN
Function Internal Ground Shield between Channels A Channel Analog Ground. A and B grounds should be connected as close to the device as possible. Inverting Differential Input (Gain = 1). Noninverting Differential Input (Gain = 1). Single-Ended Amplifier Output (Gain = 2). Analog Input for A Side ADC (Nominally 0.5 V). Analog Input for A Side ADC (Nominally 1.0 V). A Channel Analog Negative Supply Voltage (Nominally -5.0 V or -5.2 V). A Channel Analog Positive Supply Voltage (Nominally 5.0 V). Complement of Encode; Differential Input. Encode Input; Conversion Initiated on Rising Edge. A Channel Digital Positive Supply Voltage (Nominally 5.0 V/ 3.3 V). No Connect. Digital Outputs for ADC A. D0 (LSB). A Channel Digital Ground. Data Ready A Output. Data Ready B Output. Digital Outputs for ADC B. D0 (LSB). B Channel Digital Ground. B Channel Digital Positive Supply Voltage (Nominally 5.0 V/ 3.3 V). B Channel Analog Ground. A and B grounds should be connected as close to the device as possible. Encode Input; Conversion Initiated on Rising Edge. Complement of Encode; Differential Input. B Channel Analog Positive Supply Voltage (Nominally 5.0 V). B Channel Analog Negative Supply Voltage (Nominally -5.0 V or -5.2 V). Analog Input for B Side ADC (Nominally 1.0 V). Analog Input for B Side ADC (Nominally 0.5 V). Single-Ended Amplifier Output (Gain = 2). Noninverting Differential Input (Gain = 1). Inverting Differential Input (Gain = 1).
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AD13280 -Typical Performance Characteristics
0 -10 -20 -30 -40 -50 dB
dB
0 ENCODE = 80MSPS AIN = 5MHz (-1dBFS) SNR = 69.4dBFS SFDR = 81.9dBc -10 -20 -30 -40 -50 -60 -70 -80 4 5 6 -90 -100 -110 -120 -130 0 5 10 15 20 25 30 35 40 FREQUENCY - MHz 0 5 10 15 20 25 30 35 40 6 2 3 5 4 ENCODE = 80MSPS AIN = 10MHz (-1dBFS) SNR = 69.19dBFS SFDR = 79.55dBc
-60 -70 -80 -90 -100 -110 -120 -130 2 3
FREQUENCY - MHz
TPC 1. Single Tone @ 5 MHz
TPC 4. Single Tone @ 10 MHz
0 -10 -20 -30 -40 -50
dB dB
0 ENCODE = 80MSPS AIN = 18MHz (-1dBFS) SNR = 69.79dBFS SFDR = 76.81dBc -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0 5 10 15 20 25 30 35 40 -130 0 5 10 15 20 25 30 35 40 4 6 5 2 3 ENCODE = 80MSPS AIN = 37MHz (-1dBFS) SNR = 68.38dBFS SFDR = 57.81dBc
-60 -70 -80 -90 -100 -110 -120 -130
FREQUENCY - MHz
FREQUENCY - MHz
TPC 2. Single Tone @ 18 MHz
TPC 5. Single Tone @ 37 MHz
0 -10 -20 -30 -40 -50 dB dB -60 -70 -80 -90 -100 -110 -120 -130 0 5 10 15 20 25 30 35 40 ENCODE = 80MSPS AIN = 9MHz AND 10MHz (-7dBFS) SFDR = 82.77dBc
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 0 5 10 15 20 25 30 35 40 ENCODE = 80MSPS AIN = 19MHz AND 20MHz (-7dBFS) SFDR = 74.41dBc
FREQUENCY - MHz
FREQUENCY - MHz
TPC 3. Two Tone @ 9 MHz/10 MHz
TPC 6. Two Tone @ 19 MHz/20 MHz
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3.0 2.5 2.0 1 1.5
LSB
3 ENCODE = 80MSPS DNL MAX = 0.688 CODES DNL MIN = 0.385 CODES ENCODE = 80MSPS INL MAX = 0.562 CODES INL MIN = 0.703 CODES
2
LSB 0 512 1024 1536 2048 2560 3072 3584 4096
1.0 0.5 0
0
-1
-2 -0.5 -1.0 -3 0 512 1024 1536 2048 2560 3072 3584 4096
TPC 7. Differential Nonlinearity
TPC 9. Integral Nonlinearity
0 -1 -2 -3 -4 dBFS -5 -6 -7 -8 -9 -10 1.0 3.5 6.0 8.5 11.0 13.5 16.0 18.5 21.0 23.5 26.0 ENCODE = 80MSPS ROLL-OFF = 0.0459dB
FREQUENCY - MHz
TPC 8. Passband Ripple to 25 MHz
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DEFINITION OF SPECIFICATIONS Analog Bandwidth Minimum Conversion Rate
The analog input frequency at which the spectral power of the fundamental frequency (as determined by the FFT analysis) is reduced by 3 dB.
Aperture Delay
The encode rate at which the SNR of the lowest analog signal frequency drops by no more than 3 dB below the guaranteed limit.
Maximum Conversion Rate
The encode rate at which parametric testing is performed.
Output Propagation Delay
The delay between a differential crossing of ENCODE and ENCODE command and the instant at which the analog input is sampled.
Aperture Uncertainty (Jitter)
The delay between a differential crossing of ENCODE and ENCODE command and the time when all output data bits are within valid logic levels.
Overvoltage Recovery Time
The sample-to-sample variation in aperture delay.
Differential Analog Input Resistance, Differential Analog Input Capacitance, and Differential Analog Input Impedance
The amount of time required for the converter to recover to 0.02% accuracy after an analog input signal of the specified percentage of full scale is reduced to midscale.
Power Supply Rejection Ratio
The real and complex impedances measured at each analog input port. The resistance is measured statically and the capacitance and differential input impedances are measured with a network analyzer.
Differential Analog Input Voltage Range
The ratio of a change in input offset voltage to a change in power supply voltage.
Signal-to-Noise-and-Distortion (SINAD)
The peak-to-peak differential voltage that must be applied to the converter to generate a full-scale response. Peak differential voltage is computed by observing the voltage from the other pin, which is 180 degrees out of phase. Peak-to-peak differential is computed by rotating the inputs phase 180 degrees and taking the peak measurement again. The difference is then computed between both peak measurements.
Differential Nonlinearity
The ratio of the rms signal amplitude (set at 1 dB below full scale) to the rms value of the sum of all other spectral components, including harmonics but excluding dc. May be reported in dB (i.e., degrades as signal level is lowered) or in dBFS (always related back to converter full scale).
Signal-to-Noise Ratio (without Harmonics)
The deviation of any code from an ideal 1 LSB step.
Encode Pulsewidth/Duty Cycle
The ratio of the rms signal amplitude (set at 1 dB below full scale) to the rms value of the sum of all other spectral components, excluding the first five harmonics and dc. May be reported in dB (i.e., degrades as signal level is lowered) or in dBFS (always related back to converter full scale).
Spurious-Free Dynamic Range
Pulsewidth high is the minimum amount of time that the ENCODE pulse should be left in Logic "1" state to achieve rated performance; pulsewidth low is the minimum time ENCODE pulse should be left in low state. At a given clock rate, these specs define an acceptable Encode duty cycle.
Harmonic Distortion
The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component. The peak spurious component may or may not be a harmonic.
Transient Response
The ratio of the rms signal amplitude to the rms value of the worst harmonic component.
Integral Nonlinearity
The time required for the converter to achieve 0.02% accuracy when a one-half full-scale step function is applied to the analog input.
Two-Tone Intermodulation Distortion Rejection
The deviation of the transfer function from a reference line measured in fractions of 1 LSB using a "best straight line" determined by a least square curve fit.
tA
The ratio of the rms value of either input tone to the rms value of the worst third order intermodulation product; reported in dBc.
N+3 N AIN N+1 N+2 N+4
t ENC
ENC, ENC N
t ENCH
N+1
t ENCL
N+2 N+3
N+4
t E_DR
D[11:0] N-3 N-2 N-1 N
t OD
DRY
Figure 1. Timing Diagram
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AMP-IN-X-1 100 AMP-IN-X-2 100 TO AD8037
THEORY OF OPERATION
Figure 2. Single-Ended Input Stage
LOADS AVCC AVCC 10k ENCODE 10k 10k AVCC 10k ENCODE AVCC
The AD13280 is a high-dynamic range 12-bit, 80 MHz pipeline delay (three pipelines) analog-to-digital converter. The custom analog input section provides input ranges of 1 V and 2 V p-p and input impedance configurations of 50 , 100 , and 200 . The AD13280 employs four monolithic ADI components per channel (AD8037, AD8138, AD8031, and a custom ADC IC), along with multiple passive resistor networks and decoupling capacitors to fully integrate a complete 12-bit analog-to-digital converter. In the single-ended input configuration the input signal is passed through a precision laser trimmed resistor divider allowing the user to externally select operation with a full-scale signal of 0.5 V, or 1.0 V by choosing the proper input terminal for the application. The result of the resistor divider is to apply a fullscale input approximately 0.4 V to the noninverting input of the internal AD8037 amplifier. The AD13280 analog input includes an AD8037 amplifier featuring an innovative architecture that maximizes the dynamic range capability on the amplifiers' inputs and outputs. The AD8037 amplifier provides a high input impedance and gain for driving the AD8138 in a single-ended to differential amplifier configuration. The AD8138 has a -3 dB bandwidth at 300 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 differential outputs help balance the differential inputs to the custom ADC maximizing the performance of the device.
LOADS
Figure 3. ENCODE Inputs
DVCC
CURRENT MIRROR
DVCC VREF DR OUT
The AD8031 provides the buffer for the internal reference analogto-digital converter. The internal reference voltage of the custom ADC is designed to track the offsets and drifts and is used to ensure matching over an extended temperature range of operation. The reference voltage is connected to the output common-mode input on the AD8138. This reference voltage sets the output common mode on the AD8138 at 2.4 V, which is the midsupply level for the ADC. The custom ADC has complementary analog input pins, AIN and AIN. Each analog input is centered at 2.4 V and should swing 0.55 V around this reference. Since AIN and AIN are 180 degrees out of phase, the differential analog input signal is 2.2 V peak-to-peak. Both analog inputs are buffered prior to the first track-and-hold. The custom ADC digital outputs drive 100 series resistors (Figure 5). The result is a 12-bit parallel digital CMOS-compatible word, coded as two's complement.
USING THE SINGLE-ENDED INPUT
CURRENT MIRROR
Figure 4. Digital Output Stage
DVCC
CURRENT MIRROR
DVCC VREF 100 D0-D11
The AD13280 has been designed with the user's ease of operation in mind. Multiple input configurations have been included on-board to allow the user a choice of input signal levels and input impedance. The standard inputs are 0.5 V and 1.0 V. The user can select the input impedance of the AD13280 on any input by using the other inputs as alternate locations for the GND. The following chart summarizes the impedance options available at each input location. AMP-IN-X-1 = 100 when AMP-IN-X-2 is open. AMP-IN-X-1 = 50 when AMP-IN-X-2 is shorted to GND. AMP-IN-X-2 = 200 when AMP-IN-X-1 is open. Each channel has two analog inputs AMP-IN-A-1 and AMPIN-A-2 or AMP-IN-B-1 and AMP-IN-B-2. Use AMP-IN-A-1 -9-
CURRENT MIRROR
Figure 5. Digital Output Stage
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or AMP-IN-B-1 when an input of 0.5 V full scale is desired. Use AMP-IN-A-2 or AMP-IN-B-2 when 1 V full scale is desired. Each channel has an AMP-OUT which must be tied to either a noninverting or inverting input of a differential amplifier with the remaining input grounded. For example, Side A, AMP-OUT-A (Pin 6) must be tied to A+IN (Pin 5) with A-IN (Pin 5) tied to ground for noninverting operation or AMP-OUT-A (Pin 6) tied to A-IN (Pin 4) with A+IN (Pin 5) tied to ground for inverting operation.
USING THE DIFFERENTIAL INPUT
If a low jitter ECL/PECL clock is available, another option is to ac-couple a differential ECL/PECL signal to the encode input pins as shown below. A device that offers excellent jitter performance is the MC100LVEL16 (or same family) from Motorola.
VT 0.1 F ENCODE ECL/ PECL 0.1 F
AD13280
ENCODE
Each channel of the AD13280 was designed with two optional differential inputs, A+IN, A-IN and B+IN, B-IN. The inputs provide system designers with the ability to bypass the AD8037 amplifier and drive the AD8138 directly. The AD8138 differential ADC driver can be deployed in either a single-ended or differential input configuration. The differential analog inputs have a nominal input impedance of 620 and nominal fullscale input range of 1.2 V p-p. The AD8138 amplifier drives a differential filter and the custom analog-to-digital converter. The differential input configuration provides the lowest even-order harmonics and signal-to-noise (SNR) performance improvement of up to 3 dB (SNR = 73 dBFS). Exceptional care was taken in the layout of the differential input signal paths. The differential input transmission line characteristics are matched and balanced. Equal attention to system level signal paths must be provided in order to realize significant performance improvements.
APPLYING THE AD13280 Encoding the AD13280
VT
Figure 7. Differential ECL for Encode
Jitter Consideration
The signal-to-noise ratio (SNR) for any ADC can be predicted. When normalized to ADC codes, Equation 1 accurately predicts the SNR based on three terms. These are jitter, average DNL error, and thermal noise. Each of these terms contributes to the noise within the converter.
2 (1 + ) VNOISE RMS SNR = -20 x log N + (2 x x f ANALOG x t J RMS )2 + N 2 2 1/2
(1)
fANALOG tJ RMS N
= analog input frequency = rms jitter of the encode (rms sum of encode source and internal encode circuitry) = average DNL of the ADC (typically 0.50 LSB) = Number of bits in the ADC
The AD13280 encode signal must be a high quality, extremely low phase noise source, to prevent degradation of performance. Maintaining 12-bit accuracy at 80 MSPS places a premium on encode clock phase noise. SNR performance can easily degrade 3 dB to 4 dB with 37 MHz input signals when using a high-jitter clock source. See Analog Devices' Application Note AN-501, "Aperture Uncertainty and ADC System Performance" for complete details. For optimum performance, the AD13280 must be clocked differentially. The encode signal is usually ac-coupled into the ENCODE and ENCODE pins via a transformer or capacitors. These pins are biased internally and require no additional bias. Shown below is one preferred method for clocking the AD13280. The clock source (low jitter) is converted from single-ended to differential using an RF transformer. The back-to-back Schottky diodes across the transformer secondary limit clock excursions into the AD13280 to approximately 0.8 V p-p differential. This helps prevent the large voltage swings of the clock from feeding through to the other portions of the AD13280, and limits the noise presented to the ENCODE inputs. A crystal clock oscillator can also be used to drive the RF transformer if an appropriate limited resistor (typically 100 ) is placed in the series with the primary.
CLOCK SOURCE 0.1 F 100 T1-4T
VNOISE RMS = V rms noise referred to the analog input of the ADC (typically 5 LSB) For a 12-bit analog-to-digital converter like the AD13280, aperture jitter can greatly affect the SNR performance as the analog frequency is increased. The chart below shows a family of curves that demonstrates the expected SNR performance of the AD13280 as jitter increases. The chart is derived from the above equation. For a complete discussion of aperture jitter, please consult Analog Devices' Application Note AN-501, "Aperture Uncertainty and ADC System Performance."
71 70 69 68 67
SNR - -dBFS
AIN = 5MHz
AIN = 10MHz
66 65 64 63 62 61 60 59 AIN = 37MHz AIN = 20MHz
ENCODE
1.4 1.6 1.8 2.0 2.2 2.4
0.6 0.8 1.0 1.2
2.6 2.8 3.0
AD13280
ENCODE HSMS2812 DIODES
CLOCK JITTER - ps
Figure 8. SNR vs. Jitter
Figure 6. Crystal Clock Oscillator--Differential Encode
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3.6 3.8 4.0
58
0.0 0.2 0.4 3.2 3.4
REV. 0
AD13280
Power Supplies LAYOUT INFORMATION
Care should be taken when selecting a power source. Linear supplies are strongly recommended. Switching supplies tend to have radiated components that may be "received" by the AD13280. Each of the power supply pins should be decoupled as closely as possible to the package, using 0.1 F chip capacitors. The AD13280 has separate digital and analog power supply pins. The analog supplies are denoted AVCC and the digital supply pins are denoted DVCC. AVCC and DVCC should be separate power supplies because the fast digital output swings can couple switching current back into the analog supplies. Note that AVCC must be held within 5% of 5 V. The AD13280 is specified for DVCC = 3.3 V as this is a common supply for digital ASICs.
Output Loading
The schematic of the evaluation board (Figure 10) represents a typical implementation of the AD13280. The pinout of the AD13280 is very straightforward and facilitates ease of use and the implementation of high-frequency/high-resolution design practices. It is recommended that high-quality ceramic chip capacitors be used to decouple each supply pin to ground directly at the device. All capacitors can be standard high-quality ceramic chip capacitors. Care should be taken when placing the digital output runs. Because the digital outputs have such a high slew rate, the capacitive loading on the digital outputs should be minimized. Circuit traces for the digital outputs should be kept short and connect directly to the receiving gate. Internal circuitry buffers the outputs of the ADC through a resistor network to eliminate the need to externally isolate the device from the receiving gate.
EVALUATION BOARD
Care must be taken when designing the data receivers for the AD13280. The digital outputs drive an internal series resistor (e.g., 100 ) followed by a gate like 75LCX574. To minimize capacitive loading, there should be only one gate on each output pin. An example of this is shown in the evaluation board schematic shown in Figure 9. The digital outputs of the AD13280 have a constant output slew rate of 1 V/ns. A typical CMOS gate combined with a PCB trace will have a load of approximately 10 pF. Therefore, as each bit switches, 10 mA (10 pF x 1 V / 1 ns) of dynamic current per bit will flow in or out of the device. A full-scale transition can cause up to 120 mA (12 bits x 10 mA/bit) of transient current through the output stages. These switching currents are confined between ground and the DVCC pin. Standard TTL gates should be avoided since they can appreciably add to the dynamic switching currents of the AD13280. It should also be noted that extra capacitive loading will increase output timing and invalidate timing specifications. Digital output timing is guaranteed with 10 pF loads.
The AD13280 evaluation board (Figure 9) is designed to provide optimal performance for evaluation of the AD13280 analog-to-digital converter. The board encompasses everything needed to ensure the highest level of performance for evaluating the AD13280. The board requires an analog input signal, encode clock, and power supply inputs. The clock is buffered on-board to provide clocks for the latches. The digital outputs and out clocks are available at the standard 40-pin connectors J1 and J2. Power to the analog supply pins is connected via banana jacks. The analog supply powers the associated components and the analog section of the AD13280. The digital outputs of the AD13280 are powered via banana jacks with 3.3 V. Contact the factory if additional layout or applications assistance is required.
Figure 9. Evaluation Board Mechanical Layout
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AD13280
Bill of Materials List for Evaluation Board
Qty. 2 1 2 10 2 4 28 Component Name 74LCX16373MTD AD13280AZ ADP3330 BJACK BRES0805 BRES0805 CAP2 Ref/Des U7, U8 U1 U5, U6 BJ1-BJ10 R41, R53 R38, R39, R55, R56 C1, C2, C5-C10, C12, C16-C18, C20-C26, C28, C30-C38 C13, C27 J1, J2 L1-L6 U2, U4, U9, U11 U4, U10 C3, C4, C11, C14, C15, C19, C29, C30 R47-R50 R1, R2, R5, R7, R8, R54 R3, R4, R6, R9, R12-R15, R19-R28, R31-R36, R37, R42, R43, R44-R46 R51, R52 J3-J14 Value Description Latch AD13280 Regulator Banana Jacks 0805 SM Resistor 0805 SM Resistor 0805 SM Capacitor Manufacturing Part No. 74LCX16373MTD (Fairchild) AD13280AZ ADP3330ART-3.3RL7 108-0740-001 (Johnson Components) ERJ-6GEYJ 240V ERJ-6GEYJ 333V GRM 40X7R104K025BL
25 33 k 0.1 F
2 2 6 4 2 8 4 6 36
CAP2 H40DM IND2 MC10EL16 MC100ELT23 POLCAP2 RES2 RES2 RES2
0.47 F 47 10 F 0 50 100
0805 SM Capacitor 2 x 20 40 Pin Male Connector SM Inductor Clock Drivers ECL/TTL Clock Drivers Tantalum Polar Caps 0805 SM Resistor 0805 SM Resistor 0805 SM Resistor
VJ1206U474MFXMB TSW-120-08-G-D 2743019447 MC1016EP16D SY100ELT23L T491C106M016A57280 ERJ-6GEY OR 00V ERJ-6GEYJ 510V ERJ-6GEYJ 101V
12 4 4 1
SMA Standoff Screws PCB
SMA Connectors Standoff Screws (Standoff) AD13280 Eval Board (Rev. B)
142-0701-201 313-2477-016 (Johnson Components) MPMS 004 0005 PH (Building Fasteners) GS03361
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REV. 0
AD13280
J13 SMA J9 SMA J3 SMA AGNDA AGNDA AGNDA J4 SMA E50
E71 E73 E75 E79 E81 E76 E78
E68 AGNDA
E66 LIDA
E67 AGNDB J8 SMA J14 SMA E53
E83
J6 SMA
E51 E49 E69 AGNDA
9 8 7 AGNDA AMP IN A 2 AMP IN A 1
E54 E52 E85
63 62 61
J7 SMA
AGNDB AGNDB
66 E80
65 E82
64 E84
6 E72
5 E74
4 E77
E70
E86
AGNDB
68
AGNDB
67
AGNDB AGNDB AGNDB -5.2VAB +5VAB AGNDB ENCBB ENCB AGNDB 55 54 53 52 51 50 49 48 47 46 45 44 D11B D10B D9B D8B D7B D6B D5B D4B DGNDB DGNDB 60 59 58 57 56 AGNDB ENCBB ENCB AGNDB AGNDB OUT 3.3VDB C18 0.1 F C37 0.1 F AGNDB -5VAB C33 0.1 F AGNDB +5VAB C17 C38 0.1 F 0.1 F
3
2 AGNDA
AGNDA
1
AGNDB
AMP IN B 1
AGNDA -5VAA C9 0.1 F AGNDA +5VAA C34 C35 0.1 F 0.1 F AGNDA 10 11 12 13 AGNDA ENCAB AGNDA OUT 3.3VDA C36 0.1 F C10 0.1 F ENCA AGNDA 14 15 16 17 NC0A NC1A DGNDA D0A D1A D2A D3A D4A D5A DGNDA 18 19 20 21 22 23 24 25 26 AGNDA -5VAA +5VAA AGNDA ENCAB ENCA AGNDA +3VDA NC NC D0A(LSB) D1A D2A D3A
U1
AMP IN B 2
AMP OUT A
AMP OUT B
SHIELD
AGNDB
A-IN
A+IN
B-IN
B+IN
+3.3VDB D11B(MSB) D10B D9B D8B D7B D6B
AD13280
D11A(MSBA)
DRBOUT
DRAOUT
SHIELD
D10A
D6A
D7A
D8A
D9A
D1B
D2B
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
D3B
DGNDA
DGNDA
DGNDB
D5A
D0B(LSBB)
D4A
D5B D4B DGNDB
NC
NC
NC = NO CONNECT
DRAOUT E56 LIDB E65 DGNDA E48 E40
DRBOUT E55
DGNDB
+3VDA BJ10 1 C29 10 F U7 C62 0.1 F
47 20% @100MHz L1 DUT 3.3VDA
+3VAA 47 20% @100MHz BJ6 1 C3 10 F +5VAA L3 U1 C20 0.1 F
DGNDB
NC0B
NC1B
D1B
D2B
D11A
DGNDA
D10A
D6A
D7A
D8A
D9A
D0B
D3B
43
-5VAA 47 20%@100MHz BJ2 1 C11 10 F AGNDA -5VAA L5 U1 C32 0.1 F
AGNDA DGNDA
AGNDA
AGNDA
+3VDB BJ9 1 C30 10 F U8 C16 0.1 F
47 20% @100MHz DUT 3.3VDB L2
+5VAB 47 20%@100MHz BJ5 1 C4 10 F +5VAB L4 U1 C21 0.1 F
-5VAB 47 20%@100MHz BJ1 1 C19 10 F -5VAB L6 U1 C31 0.1 F
DGNDB
AGNDB
AGNDB
AGNDB
AGNDB
Figure 10a. Evaluation Board
REV. 0
-13-
AD13280
U8
R47 0
25 26 27 28
LE2 115 114
OE2 O15 O14
24 23 22
DGNDA
R18, DNI R17, DNI
F0A F1A F2A F3A B0A (LSB) B1A B2A B3A B4A B5A B6A B7A 3.3VDA MSB B11A B10A C15 10 F B9A B8A B7A DGNDA
H40DM J1 1 2 3 4 5 6 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 DGNDA
R48 0
DGNDA
GND GND
DGNDA R40, DNI R44, DNI DUT 3.3VDA R45, 100 DGNDA R46, 100 R15, 100 R14, 100 R13, 100 R15, 100 DGNDA
DGNDA
NC0A NC1A
DUT 3.3VDA
LSB D0A D1A
DGNDA
D2A D3A D4A D5A
DGNDA
D6A D7A
DUT 3.3VDA
D8A D9A
DGNDA
D10A MSB D11A
R7 50
113 29 112 30 VCC 31 111 32 110 33 GND 34 19 35 18 36 17 37 16 38 GND 39 15 40 14 41 VCC 42 13 43 12 44 GND 45 11 46 10 47 LE1 48
21 O13 20 O12 19 VCC 18 O11 17 O10 16 GND 15 O9 14 O8 13 O7 12 O6 11 GND 10 O5 9 O4 8 VCC 7 O3 6 O2 5 GND 4 O1 3 O0 2 OE1 1
R24, 100 R23, 100
DUT 3.3VDA R22, 100 R21, 100 DGNDA R20, 100 R19, 100 DGNDA
B8A B9A B10A B11A (MSB)
7 B6A 8 B5A 9 R5 E61 50 B4A 10 11 E59 E60 12 B3A 13 B2A 14 B1A 15 LSB B0A 16 F3A 17 F2A 18 F1A 19 F0A 20 DGNDA BUFLATA DRAOUT
LATCHA 74LCX16374 E58
U7
R49 0
25 26 27 28
LE2 115 114
OE2 O15 O14
24 23 22
DGNDB
R11, DNI R10, DNI
F0B F1B F2B F3B B0B (LSB) B1B B2B B3B B4B B5B B6B B7B E63 E64
R2 50
J2 H40DN 3.3VDB MSB B11B B10B C14 10 F B9B B8B B7B DGNDB B6B B5B B4B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 DGNDB
R50 0
DGNDB
GND GND
DGNDB R30, DNI R29, DNI DUT 3.3VDB R28, 100 DGNDB R27, 100 R26, 100 R12, 100 R9, 100 R25, 100 DGNDB
DGNDB
NC0B NC1B
DUT 3.3VDB
LSB D0B D1B
DGNDB
D2B D3B D4B D5B
DGNDB
D6B D7B
DUT 3.3VDB
D8B D9B
DGNDB
D10B MSB D11B
R8 50
113 29 112 30 VCC 31 111 32 110 33 GND 34 19 35 18 36 17 37 16 38 GND 39 15 40 14 41 VCC 42 13 43 12 44 GND 45 11 46 10 47 LE1 48
21 O13 20 O12 19 VCC 18 O11 17 O10 16 GND 15 O9 14 O8 13 O7 12 O6 11 GND 10 O5 9 O4 8 VCC 7 O3 6 O2 5 GND 4 O1 3 O0 2 OE1 1
E62 BUFLATB DRAOUT B3B B2B B1B LSB B0B F3B F2B F1B F0B DGNDB
R36, 100 R35, 100
DUT 3.3VDB R34, 100 R33, 100 DGNDB R32, 100 R31, 100 DGNDB
B8B B9B B10B B11B (MSB)
LATCHB 74LCX16374 E57
Figure 10b. Evaluation Board
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REV. 0
AD13280
U5 3 +5VAA 2 5 ERR IN SD GND 4 AGNDA J5 ENCODE SMA C13 0.47 F C1 0.1 F 1 2 NC D VCC 8 7 6 5 AGNDA MC10EL16 NC = NO CONNECT DGNDA R55 33k R41 25 1 2 AGNDA 8 7 6 5 DGNDA R4 100 R56 33k C6 0.47 F AGNDA NC D VCC +3.3VDA R3 100 1 2 3 4 DGND DGNDA R43 100 AGNDA C8 0.1 F AGNDA 5 NR OUT 1
ADP3330
R42 100 C7 0.1 F ENCAB ENCA 1 BJ7 1 DGNDB BJ8 1 C5 0.47 F 8 7 6 5 DGNDA DGNDA DGNDB BJ3 1 BJ4 AGNDA AGNDB
+3.3VA
AGNDA
R1 50 AGNDA
3 DB 4 VBB
U2
Q QB VEE
J12 SMA
C2 0.1 F
U3
Q QB VEE
NC D DB VBB
VCC
+3.3VDA LATCHA E23 E19 BUFLATA DGNDA
3 DB 4 VBB
E15 E7
E16 E12 DGNDB
U4
Q0 Q1 VEE
MC10EL16 NC = NO CONNECT
DGNDA
MC100EPT23 NC = NO CONNECT DGNDA
E11 E39
E8 E47 DGNDB
5 3 NR ERR OUT 1
+5VAB
ADP3330 2 IN U6
5 SD GND 4 AGNDB AGNDB R52 100 +3.3VB C24 0.1 F ENCBB ENCB AGNDB R51 100 AGNDA DGNDB C28 0.1 F DGNDA
E17 E27 E25 E21 E32 E44 E42 E10 E33 E6
E18 E28 E26 E20 E31 E43 E41 E9 E34 E5 AGNDA
J10 ENCODE SMA
C27 0.47 F C22 0.1 F 1 2 3 NC D DB VBB VCC 8 7 6 5
U11
Q QB VEE
AGNDB
R54 50 AGNDB
4
MC10EL16 NC = NO CONNECT R38 33k C25 0.47 F DGNDB 8 7 +3.3VDB R37 100
E38 E29 E1 E36 E14 E45 E3
E37 E30 E2 E35 E13 E46 E4 AGNDB
J11 SMA
C23 0.1 F 1 R53 25 2
DGNDB R39 33k
C26 0.1 F 1 2 8 7 6 5
DGNDB
SO1 SO2 SO3
SO4 SO5 SO6
NC
VCC
AGNDB
D Q U9 6 3 DB QB 4 5 VBB VEE MC10EL16 NC = NO CONNECT DGNDB
NC D DB VBB
VCC
+3.3VDA LATCHB E24 E22 BUFLATB DGNDB
R6 100 DGNDB
3 4
U10
Q0 Q1
VEE
MC100EPT23 NC = NO CONNECT
Figure 10c. Evaluation Board
REV. 0
-15-
AD13280
Figure 11a. Top Silk
Figure 11b. Top Layer
-16-
REV. 0
AD13280
Figure 11c. GND1
Figure 11d. GND2
REV. 0
-17-
AD13280
Figure 11e. Bottom Silk
Figure 11f. Bottom Layer
-18-
REV. 0
AD13280
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
68-Lead Ceramic Leaded Chip Carrier (ES-68C)
0.235 (5.97) MAX
0.010 (0.25) 0.008 (0.20) 0.007 (0.18)
0.960 (24.38) 0.950 (24.13) SQ 0.940 (23.88)
60 61 44 43
1.070 (27.18) MIN
0.800 (20.32) BSC
PIN 1
TOP VIEW
(PINS DOWN)
1.190 (30.23) 1.180 (29.97) SQ 1.170 (29.72)
9 10 26
27
0.060 (1.52) 0.050 (1.27) 0.040 (1.02)
DETAIL A 0.175 (4.45) MAX 0.055 (1.40) 0.050 (1.27) 0.045 (1.14) 0.020 (0.508) 0.017 (0.432) 0.014 (0.356)
REV. 0
-19-
AD13280
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
68-Lead Ceramic Leaded Chip Carrier With Non-Conductive Tie-Bar (ES-68C)
0.960 (24.38) 0.950 (24.13) SQ 0.940 (23.88)
0.350 (8.89) TYP
0.015 (0.3) 45 3 PLS
2.000 (8.89) TYP
PIN 1
TOP VIEW
(PINS DOWN)
0.055 (1.40) 0.050 (1.27) 0.045 (1.14) 0.020 (0.508) 0.017 (0.432) 0.014 (0.356)
0.040 (1.02) 45
0.040 (1.02) R TYP
0.800 (20.32) BSC 0.175 (4.45) MAX DETAIL A
0.235 (5.97) MAX 0.010 (0.25) 0.008 (0.20) 0.007 (0.18)
0.010 (0.254)
30 0.050 (1.27) 0.020 (0.508) DETAIL A
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REV. 0
PRINTED IN U.S.A.
C02386-2.5-4/01(0)

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