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7872
14-Bit A/D Converter
AGND C REF REF OUT VIN VDD VDD
12
11
13
R R
14
TRACK/HOLD
9
16
COMP
3V REFERENCE
14-BIT DAC
CLK
3
CLOCK
SAR + COUNTER
CONTROL CONVST
1 2
CONTROL LOGIC 4
SERIAL INTERFACE 5
SCLK
6
SDATA
8
DGND
15
VSS
SSTRB
Logic Diagram
Memory
FEATURES:
* 14-bit resolution and accuracy * Total dose hardness: - > 100 krad (Si), depending upon space mission * Single event effects: - SEL > 104 MeV/mg/cm2 - SEUTH = 1.4 MeV/mg/cm2 - SEUSat = 1E-3 cm2/Device * Package: - 16 pin RAD-PAK(R) flat package - 16 pin RAD-PAK(R) dual-in-line package * Fast Conversion Times: 10 s * Low 50 mW typical power consumption * High speed LC2MOS technology - Analog input range of 3V - 83 KSPS throughput rate - Operates with +5V/-5V power supplies - 80 dB SNR at 10 kHz input frequency - 2 s complement coding - Serial output
DESCRIPTION:
Maxwell Technologies' 7872 high-speed 14-bit ADC microcircuit features a greater than 100 krad (Si) total dose tolerance; depending upon orbit. The 7872 consists of a track/hold amplifier, successive-approximation ADC, 3V buried Zener reference and versatile interface logic. It features a self-contained, laser- trimmed internal clock, so no external clock timing components are required. For minimum noise possible, the onchip clock may be overridden to synchronize the device operation to the digital system. The 7872 is a serial output device. It is capable of interfacing to all modern microprocessors and digital signal processors. The 7872 operates from 5V power supplies, accepts bipolar input signals of 3V and is able to convert full power signals up to 41.5 kHz. It is also fully specified for dynamic performance parameters including distortion and signal-to-noise ratio. Maxwell Technologies' patented RAD-PAK(R) packaging technology incorporates radiation shielding in the microcircuit package. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, RAD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to Class S.
5.21.02 Rev 4
All data sheets are subject to change without notice
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(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
7872
TABLE 1. 7872 PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SIGNAL CONTROL CONVST CLK SSTRB SCLK SDATA NC DGND VDD NC CREF AGND REFOUT VIN VSS VDD DESCRIPTION Control Function Convert Start Clock Input Serial Strobe Serial Clock Serial Data Non Connect Digital Ground Positive Supply No Connect Reference Capacitor Analog Ground Voltage Reference Output Analog Input Negative Supply Positive Supply
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TABLE 2. 7872 ABSOLUTE MAXIMUM RATINGS
PARAMETER Positive Supply Voltage; Relative to GND Negative Supply Voltage; Relative to GND AGND to DGND; Relative to GND REFOUT, CREF to AGND VIN to AGND Digital Input Voltage Digital Output Voltage Thermal Impedance Storage Temperature Range Operating Temperature Range SYMBOL VDD VSS ---VIN VOUT MIN -0.3 0.3 -0.3 0 VSS -0.3 -0.3 -0.3 --65 -55 MAX 7.0 7.0 VDD +0.3 VDD VDD +0.3 VDD +0.3 VDD +0.3 2.44 150 125 UNIT V V V V V V V C/W C C
JC
TS TA
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
TABLE 3. 7872 DC ELECTRICAL CHARACTERISTICS FOR DYNAMIC PERFORMANCE 1
(VDD = 5 V 5%, VSS = -5 V 5%, AGND = DGND = 0 V, fCLK = 2 MHZ EXTERNAL, fSAMPLE = 83 KHZ, -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Signal to Noise Ratio VIN = 10kHz Sine Wave, TMIN to TMAX; SNR is typically 82dB for VIN < 41.5kHz 2 Total Harmonic Distortion VIN = 10kHz Sine Wave Peak Harmonic or Spurious Noise Intermodulation Distortion Second Order Terms: fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz Third Order Terms: fa = 9 kHz, fb = 9.5 kHz, fSAMPLE= 50 kHz Track/Hold Acquisition Time 1. VIN = 3 V. Guaranteed by design. 2. SNR calculation includes distortion and noise components. SYMBOL SNR SUBGROUPS 4, 5, 6 MIN 79 TYP -MAX --
7872
UNIT dB
THD -IMD
4, 5, 6 4, 5, 6 4, 5, 6
-----
-86 -86 -86 -86
-----
dB dB dB
--
4, 5, 6
--
--
2
s
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TABLE 4. 7872 DC ELECTRICAL CHARACTERISTICS FOR ACCURACY
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Resolution Resolution for Which No Missing Codes are Guaranteed Integral Nonlinearity @ 25 C Integral Nonlinearity TMIN to TMAX Bipolar Zero Error Positive Gain Error 1 Negative Gain Error 1 1. Measured with respect to internal reference. SYMBOL -------SUGROUPS 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 MIN 14 14 -----TYP --1 ----MAX ---2 12 12 12 UNIT Bits Bits LSB LSB LSB LSB LSB
TABLE 5. 7872 DC ELECTRICAL CHARACTERISTICS FOR ANALOG INPUT
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Input Voltage Range Input Current SYMBOL --SUBGROUPS 1, 2, 3 1, 2, 3 MIN -3 -500 MAX 3 500 UNITS V A
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
TABLE 6. 7872 DC ELECTRICAL CHARACTERISTICS FOR REFERENCE OUTPUT
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER REFOUT @ +25 C REFOUT TMIN to TMAX REFOUT Tempco: Typically 35ppm Reference Load Sensitivity (DREFOUT/DI) Reference Load Current Change (0-300 A); Reference Load Should Not Be Changed During Conversion SYMBOL ----SUGGROUPS 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 MIN 2.99 2.98 --MAX 3.01 3.02 40 1.2
7872
UNIT V V ppm/oC mV
TABLE 7. 7872 DC ELECTRICAL CHARACTERISTICS FOR LOGIC INPUTS
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Input High Voltage: VDD 5 V 5% Input Low Voltage: VDD 5 V 5% Input Current: VIN = 0 V to VDD Input Current: (14/8/CLK input only) VIN = VSS to VDD Input Capacitance 1 1. Not tested. SYMBOL VINH VINL IIN -CIN SUGGROUPS 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 MIN 2.4 --10 -10 -MAX -0.8 10 10 10 UNIT V V A A pF
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TABLE 8. 7872 DC ELECTRICAL CHARACTERISTICS FOR LOGIC OUTPUTS
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Output High Voltage ISOURCE = 40 A Output Low Voltage ISINK = 1.6 mA Floating-State Leakage Current Floating-State Output Capacitance 1. Not tested.
1
SYMBOL VOH VOL ---
SUBGROUPS 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3
MIN 4.0 ----
MAX -0.4 10 15
UNIT V V A pF
TABLE 9. 7872 DC ELECTRICAL CHARACTERISTICS FOR CONVERSION TIME
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER External Clock Internal Clock: Nominal Value = 2 MHz SYMBOL --SUBGROUPS 1, 2, 3 1, 2, 3 MIN --MAX 10 11 UNIT s s
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
TABLE 10. 7872 DC ELECTRICAL CHARACTERISTICS FOR POWER REQUIREMENTS
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER Positive Supply Voltage Negative Supply Voltage Positive Supply Current Negative Supply Current Power Dissipation SYMBOL VDD VSS IDD ISS PD CONDITIONS 5% for Specified Performance 5% for Specified Performance Typically 6mA Typically 4mA Typically 50mW REQUIREMENTS 5 -5 13 6 95
7872
UNITS V V mA max mA max mW max
TABLE 11. 7872 TIMING CHARACTERISTICS 1,2
(VDD = 5V 5%, VSS = -5 V 5%, TA = -55 TO 125 C UNLESS OTHERWISE SPECIFIED) PARAMETER/CONDITION CONVST Pulse Width SSTRB to SCLK Falling Edge Setup Time SCLK Cycle Time 3 SCLK to Valid Data Delay: CL = 35 pF 4 SCLD Rising Edge to SSTRB Bus Relinquish Time After SCLK SYMBOL t1 t10 t11 t12 t13 t14 SUBGROUPS 9, 10, 11 9, 10, 11 9, 10, 11 9, 10, 11 9, 10, 11 9, 10, 11 MIN 50 100 440 -20 4 MAX ---155 150 100 UNITS ns
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ns ns ns ns ns
1. All input signals are specified with tr = tr = 5 ns (10% to 90% of 5 V) and timed from a voltage level of 1.6 V. 2. Serial timing is measured with a 4.7 k pull-up resistor on SDATA and SSTRB and a 2 k pull-up resistor on SCLK. The capacitance on all three outputs is 35 pF. 3. SCLK mark/space ration (measured from a voltage level of 1.6 V) is 40/60 to 60/40. 4. SDATA will drive higher capacitive loads, but this will add to t12 since it increases the external RC time constant (4.7k/CL) and hence, the time to reach 2.4 V.
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
FIGURE 1. MODE 1 TIMING DIAGRAM SERIAL
t1 CONVST
TRACK HOLD GOES INTO HOLD
7872
SSTRB 1
t10 SCLK2
t11
t13
t12 SDATA
LEADING ZEROS DB13 DB12 DB11 DB10 DB0
t14
1. External 4.7 k pull-up resistor. 2. External 2 k pull-up resistor continuos SCLK (DASHED LINE) when 14/8/CLK (CONTROL) = -5 V; noncontinuous when 14/ 8/CLK (CONTROL) = 0 V.
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FIGURE 2. MODE 2 TIMING DIAGRAM, SERIAL READ
HBEN1
SSTRB 2
t10
t11
t13
SCLK3
t12
t14
SDATA2
1. Times t15, t18, t19 and t20 are the same for a high byte read as for a low byte read. 2. External 4.7 k pull-up resistor. 3. Continuos SCLK (DASHED LINE) when 14/8/CLK (CONTROL) = -5 V; noncontinuous when 14/8/CLK (CONTROL) = 0 V. External 2 k pull-up resistor.
5.21.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
7872
FIGURE 3. LOAD CIRCUIT FOR ACCESS TIME
1.6mA IOL TO OUTPUT PIN +2.1V IOH 200uA
C L 50pF
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FIGURE 4. LOAD CIRCUIT FOR OUTPUT FLOAT DELAY
IOL 1.6mA TO OUTPUT PIN +2.1V IOH 200uA
C L 50pF
5.21.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
7872
Memory
16 PIN RAD-PAK(R) FLAT PACKAGE
SYMBOL MIN A b c D E E1 E2 E3 e L Q S1 N 0.325 0.020 0.005 0.116 0.015 0.004 -0.245 -0.130 0.030 DIMENSION NOM 0.130 0.017 0.005 0.415 0.280 -0.156 0.062 0.050 BSC 0.335 0.033 0.024 16 0.345 0.045 -MAX 0.143 0.022 0.009 0.440 0.285 0.315 ---
F16-01 Note: All dimensions in inches
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All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
7872
E N/2
D S2 A c Q S1 b2 b e L eA/2 eA
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16 PIN RAD-PAK(R) DUAL IN LINE PACKAGE
SYMBOL MIN A b b2 c D E eA eA/2 e L Q S1 S2 N 0.135 0.000 0.005 0.005 -0.014 0.045 0.008 -0.220 DIMENSION NOM 0.157 0.018 0.047 0.010 0.800 0.295 0.300 BSC 0.150 BSC 0.100 BSC 0.145 0.002 0.027 -16 0.155 0.060 --MAX 0.200 0.026 0.065 0.018 0.840 0.310
D16-01 Note: All dimensions in inches
5.21.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
Important Notice:
7872
These data sheets are created using the chip manufacturer's published specifications. Maxwell Technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. The specifications presented within these data sheets represent the latest and most accurate information available to date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no responsibility for the use of this information. Maxwell Technologies' products are not authorized for use as critical components in life support devices or systems without express written approval from Maxwell Technologies. Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Technologies. Maxwell Technologies' liability shall be limited to replacement of defective parts.
Memory
5.21.02 Rev 4
All data sheets are subject to change without notice
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(c)2001 Maxwell Technologies All rights reserved.
14-Bit A/D Converter
Product Ordering Options
Model Number 7872 RP X X Feature Option Details
7872
Screening Flow
Monolithic S = Maxwell Class S B = Maxwell Class B I = Industrial (testing @ -55C, +25C, +125C) E = Engineering (testing @ +25C)
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Package
D = Dual In-line Package (DIP) F = Flat Pack
Radiation Feature
RP = RAD-PAK(R) package
Base Product Nomenclature
14-Bit A/D Converter
5.21.02 Rev 4
All data sheets are subject to change without notice
11
(c)2001 Maxwell Technologies All rights reserved.

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