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M I C R O T U N ETM
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
1 APPLICATIONS
* * * Cable modems Telephony over cable Set-top box CATV
CATV APPLICATIONS
2 FEATURES
* * * * * * * * * * * * Lowest power consumption upstream amplifier available Maximum output level of 64 dBmV Low power-up/down transients of 4 mVp-p typical at 59 dBmV output Best in class second harmonic distortion Ultra low third harmonic distortion Single +5V supply 63-dB Gain range Gain programmable in 1-dB steps Low transmit output noise floor: 131 nV / Hz Low transmit-disable output noise: 810 pV / Hz Two power-down modes DOCSIS and EuroDOCSIS compatible
Preliminary and Proprietary
3 OVERVIEW
The Microtune 1530 (MT1530) is a low-cost programmable-gain power amplifier IC for use in CATV upstream applications. Specifically, the MT1530 is optimized for the DOCSIS upstream standard. The device operates at a frequency range from 5 MHz to 65 MHz, and can output 64 dBmV through a 4:1 impedance-ratio transformer. Second harmonic distortion is typically less than -70 dBc, and third harmonic distortion is typically less than -55 dBc at a 59 dBmV output level. A 3-wire digital serial bus controls the variable gain, with gain control available in 1-dB steps and a nominal 63-dB gain range. The MT1530 may be disabled via an external control pin. The transmit-disable mode not only minimizes output noise by shutting off the output stage, but also maintains its output impedance at nominal levels. Output glitch transients are nominally less than 4 mV at maximum gain settings during transmit enable/disable switching. Operating from a single +5V supply, the amplifier's typical current draw at maximum gain, or minimum attenuation, is 102 mA. Additionally, internal circuitry reduces the amplifier's power consumption depending on gain setting. Transmit-disable mode power supply current is reduced to a nominal of 14 mA. A shutdown mode further reduces current to a nominal of 130 A. The MT1530 is available in a 20-pin SSOP package for the extended industrial temperature range of -40C to +85C.
DS-00010 Rev 1.2 -- December 2000 Page 1 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 4 ABSOLUTE MAXIMUM RATING S
CATV APPLICATIONS
Stresses greater than those listed in Table 1 may cause permanent damage to the device. These are stress ratings only; functional operation of the device under conditions other than those listed in the operational sections of this document is not recommended or implied. Exposure to any of the absolute-maximum rating conditions for extended periods of time may affect reliability. Table 1 Stress Ratings PARAMETER
VCC (VCC1, VCC2) VOUT+, VOUTInput voltage levels (all inputs), VCM
MIN
-0.7 -0.7 -0.7
MAX
6 7.5 VCC + 0.7 +150
UNIT
V V V C C C
Preliminary and Proprietary
Junction temperature Storage temperature range Lead temperature (soldering, 10 seconds) -55
+150 +300
5 DC ELECTRICAL CHARACTERIS TICS
The DC electrical characteristics listed in Table 2 are valid for the following conditions unless otherwise noted. Typical parameters are at TA = +25C. * * * * VCC = +4.75V to +5.25V TXEN = high D7 = 1 TA = -40C to +85C DC Electrical Characteristics PARAMETER
Supply voltage Supply current, transmit mode Gain code = 52 to 63 Gain code = 46 to 51 Gain code = 45 to 0 Supply current, transmit-disable mode (TXEN = low) Supply current, shutdown mode (D7 = 0 or ICC ICC VIH VIL IIH IIL 0 0 2.0 0.8 ICC
Table 2
SYMBOL
VCC
MIN
4.75
TYP
MAX
5.25
UNIT
V
102 59 37 14 131
129 75 47 19 164 mA A V V A A mA
SHDN = 0)
Input high voltage Input low voltage Input high current Input low current
DS-00010 Rev 1.2 -- December 2000 Page 2 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 6 AC ELECTRICAL CHARACTERIS TICS
CATV APPLICATIONS
The AC electrical characteristics listed in Table 3 are valid for the following conditions unless otherwise noted. Typical parameters are at TA = +25C. * * * * * * VCC = +4.75V to +5.25V TXEN = SHDN = high D7 = 1 VIN = 33 dBmV differential Output impedance = 75 through a 4:1 impedance transformer TA = -40C to +85C AC Electrical Characteristics of the MT1530
CONDITIONS
FIN = 5 MHz to 42 MHz Gain control word = 0 Gain control word = 63
1
Table 3
PARAMETER
SYMBOL
AV
MIN
-33.6 28.1
TYP
-32.4 30.8 -0.25 -0.9
MAX
-31.1 32.1 -0.5 -1.5
UNIT
dB dB dB dB dBmV
Preliminary and Proprietary
Voltage gain
Gain rolloff 1 dB Compression point Output step size Transmit mode noise Transmit-disable mode noise Isolation in transmitdisable mode TXEN Transient duration TXEN Transient step size Input impedance Output impedance Output return loss Third-order output intercept 2 Harmonic distortion
nd
VOUT = 59 dBmV, FIN = 42 MHz VOUT = 59 dBmV, FIN = 65 MHz P1dB AV = 29 dB, 42 MHz
2
1
65 0.7
67 1 131 1.3 150 10.1
FIN = 5 MHz to 42 MHz AV = 26 dB
2
dB nV / Hz nV / Hz pV / Hz dB s
AV = -26 dB
2
8.5 810 69 1.5 4 2 1.35 1.85 75
TXEN = low, AV = 26 dB, FIN = 5 MHz to 65 MHz TXEN = low, gain control word = 63, FIN = 65 MHz TXEN rise/fall time < 0.1s Gain setting = 63 ZIN ZOUT RL OIP3 HD2 FIN = 5 MHz to 65 MHz
2
2
16 8
mVp-p mVp-p k dB dBmV
Gain setting = 51 or lower2 FIN = 5 MHz to 65 MHz, single-ended2
10.7 80
15 84 -72 -70 -59 -55 -66 -64 -55 -51
Input tones at 65 MHz and 66 MHz, VIN = 28 dBmV/tone, VOUT = 53 dBmV/tone2 FIN = 33 MHz, VOUT = +59 dBmV FIN = 65 MHz, VOUT = +59 dBmV FIN = 22 MHz, VOUT = +59 dBmV FIN = 65 MHz, VOUT = +59 dBmV
dBc dBc dBc dBc
3 Harmonic distortion
rd
HD3
1 2
Referenced to 10 MHz. Guaranteed by design.
DS-00010 Rev 1.2 -- December 2000 Page 3 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 7 TYPICAL PERFORMANCE
CATV APPLICATIONS
The following data is representative of a part measured in a typical application circuit. * * *
30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 0 5 10
4:1 impedance ratio balun on the output Zload = 75, Vcc = 5V TA = 25C
0.30 0.20 0.10 0.00
5MHz
65MHz
-0.10 -0.20 -0.30
5MHz 15MHz 42MHz
Preliminary and Proprietary
15
20
25
30
35
40
45
50
55
60
0
5
10
15
20
25
30
35
40
45
50
55
60
Gain Code
Gain Code
Figure 1
1.8 1.6 1.4 1.2 1.0
Voltage Gain vs. Gain Code
Referenced to 5MHz
Figure 2
100 95 90 85
Differential Gain Linearity vs. Gain Code
TXEN = LOW
65 MHz
0.8 0.6 0.4 0.2 0.0 -0.2 0 5 10 15 20 25
80 75 70 65
20 MHz
65 MHz
42 MHz
60 55
Gain Code
30
35
40
45
50
55
60
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
Gain Code
Figure 3
90 88 86 84 82 80 78 76 74 72 70 68 50 51
Gain Rolloff vs. Gain Code
Vout = 53 dBmV / Tone
42 MHz 65 MHz
Figure 4
-45 -50 -55 -60 -65
Input-Output Isolation vs. Gain Code
Vin = 34 dBmV
65 MHz
-70
33 MHz
-75 -80
52
53
54
55
56
57
58
59
60
61
62
63
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Gain Code
Gain Code
Figure 5
Third-Order Output Intercept vs. Gain Control
Figure 6
Second-Order Harmonic Distortion vs. Gain Code
DS-00010 Rev 1.2 -- December 2000 Page 4 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
CATV APPLICATIONS
-40
69
Vin = 34 dBmV
68 20 MHz
42 MHz
-45
67 66 65
-50
-55 65 MHz -60 30 MHz -65 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 63 62 61
65 MHz
Gain Code
52
53
54
55
56
Gain Code
57
58
59
60
61
62
63
Figure 7
Third-Order Harmonic Distortion vs. Gain Code
Figure 8
Output 1 dB Compression Point vs. Gain and Frequency
1.0E-06
110 100
Preliminary and Proprietary
90 1.0E-07 80 70 60 1.0E-08 50 40 30 1.0E-09 0 5 10 15 20 25 30 35 40 45 50 55 60 20 0 5 10 15 20 25
Gain Code
30 35 Gain Code
40
45
50
55
60
Figure 9
10
Output Noise vs. Gain Code
Figure 10 Power Supply Current vs. Gain Code
Z0 = 75 Ohms 15
20
25
30
35 5 15 25 35 45 55 65 75 85 95
Frequency ( MHz )
Figure 11 Output Return Loss vs. Frequency
DS-00010 Rev 1.2 -- December 2000 Page 5 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 8 DETAILED DESCRIPTION
CATV APPLICATIONS
This section describes the MT1530 functional blocks shown in Figure 12.
19 Variable Attenuator Input Amp Vcc2
Vcc1
2
Vout+ Power Amp Vcm
16
5
Vin+
14 CEXT
6
VinVout15
Preliminary and Proprietary
Serial Interface
PA Control
DGND
SHDN
12
7
8
9
10
Figure 12 MT1530 Amplifier Block Diagram
8.1 FUNCTIONAL MODES
The MT1530 amplifier has three functional modes controlled through the serial interface or external pins: transmit mode, transmit-disable mode, and shutdown mode.
8.1.1 TRANSMIT MODE
Transmit mode is the normal active mode of the MT1530. The TXEN and SHDN pins must be held high in this mode.
8.1.2 TRANSMIT-DISABLE MODE
Transmit-disable mode is typically used between bursts in TDMA systems. This mode shuts off the power amplifier while keeping the input amplifier and variable attenuator powered up. Taking TXEN low while keeping SHDN high and D7 = 1 (see Table 5) activates this mode.
18
TXEN
SCLK
SDA
CS
DS-00010 Rev 1.2 -- December 2000 Page 6 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 8.1.3 SHUTDOWN MODE
CATV APPLICATIONS
Shutdown mode minimizes current consumption while maintaining the programmed gain state stored in the latch of the serial interface. All analog functions are disabled in this mode and current consumption is reduced to 131 A (typical). Shutdown mode is enabled when either D7 = 0 or SHDN is set low. This mode overrides the TXEN input pin, but TXEN should be held low to minimize glitching when exiting this mode.
8.2 IC ARCHITECTURE
The MT1530's signal path consists of an input amplifier, a variable attenuator, and a power amplifier as shown in Figure 12. The input amplifier is a fixed-gain, low-noise, differential amplifier with a nominal input impedance of 1.85 k. The variable attenuator is capable of a 51-dB attenuation range in 1-dB steps. The output power amplifier has 12 dB of gain range in 6 dB steps.
Preliminary and Proprietary
8.2.1 INPUT AMPLIFIER
The input amplifier (IA) is a fully differential, low-noise amplifier with no gain adjustment. Its bias may be disabled either by the external SHDN pin, or D7 of the serial control register. For best second-order performance, the IA should be driven differentially. However, the device may be driven in a single-ended mode, with the other unused input bypassed to ground with a 10 nF capacitor. The IA's inputs are self-biasing and must be AC coupled.
8.2.2 VARIABLE ATTENUATOR
The variable attenuator (VA) provides up to 51 dB attenuation of the input signal in nominal 1-dB increments. The architecture is fully differential to minimize glitching and even-order harmonics. This attenuator acts together with the output power amplifier to achieve a nominal 63 dB of gain range, as described in section 8.2.3.
8.2.3 OUTPUT POWER AMPLIFIER
The output power amplifier (PA) is a fully differential amplifier capable of driving +64 dBmV into a 75 load. An off-chip transformer must be used to convert from a differential to a single-ended output. The PA's output impedance is nominally 300, which is transformed to 75 by the 4:1 impedance ratio transformer. This impedance is maintained when the amplifier is powered down by setting TXEN = low. The amplifier's outputs are powered by +5V connected to the center tap of the transformer's secondary. The differential nature of the PA provides superior second-order harmonic performance. Additionally, any single-ended transients on the amplifier's outputs that are generated during transmit enable/disable switching are cancelled by this architecture.
DS-00010 Rev 1.2 -- December 2000 Page 7 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
CATV APPLICATIONS
In addition to providing output power, the PA also plays a role in the gainprogrammability of the IC. The output amplifier has attenuation settings of 0, 6, and 12 dB. Higher attenuations reduce output power and noise. The programmed gain control code automatically sets the PA's attenuation. Gain control codes of 52 through 63 set the PA's attenuation to 0 dB, putting the PA at maximum power. Gain control codes of 46 to 51 set the PA's attenuation to 6 dB, lowering its power by half. Gain control codes of less than 46 set the PA's attenuation to 12 dB, lowering its power to one quarter of the maximum value. Transmit-disable and shutdown modes turn off power to the PA for maximum isolation and minimum output noise.
8.2.4 PA CONTROL
The PA Control (PAC) both adjusts the output amp's gain, and manages power-up and power-down transients. The PAC uses internal timing circuits to control the ramp-up and ramp-down of the PA's bias block. This orderly ramp keeps the PA's output glitch to very low levels.
Preliminary and Proprietary
The PAC begins a bias ramp-down on the falling edge of TXEN. A rising TXEN produces a bias ramp-up. Note that for a minimum glitch on the output, the rest of the IC must already be powered up by having disabled shutdown mode.
8.3 SERIAL INTERFACE
The serial interface (SI) programs the gain of the MT1530 using an 8-bit control word. The SI uses the gain control word to set the VA's and PA's gains individually using an internal decoder. It has an active-low chip-select ( CS ) to synchronize to the incoming word. Data is clocked MSB first on the rising edge of SCLK. Data is latched on the rising edge of CS . Table 4 and Table 5 show the register format. Figure 13 illustrates serial interface timing. Table 4 BIT
7 (MSB) 6 5 4 3 2 1 0 (LSB)
Serial Interface Control Word MNEMONIC
D7 D6 D5 D4 D3 D2 D1 D0
DESCRIPTION
Software shutdown (active low) Unused (Don't Care) Gain control, Bit 5 Gain control, Bit 4 Gain control, Bit 3 Gain control, Bit 2 Gain control, Bit 1 Gain control, Bit 0
DS-00010 Rev 1.2 -- December 2000 Page 8 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
CATV APPLICATIONS
Table 5
SHDN
Chip State Control Bits D7
X 0 1 1 1 1 1 1 1
TXEN
0 0 0 1 1 1 1 1 1
D6
X X X X X X X X X
D5
X X X X 0 0 1 1 1
D4
X X X X 0 0 0 1 1
D3
X X X X 0 0 0 1 1
D2
X X X X 0 0 0 1 1
D1
X X X X 0 0 0 1 1
D0
X X X X 0 1 0 0 1
GAIN STATE (DECIMAL)
X X X X 0 1 32 62 63
STATE
Shutdown mode Software shutdown mode Transmit-disable mode Transmit mode Gain = -32 dB1 Gain = -31 dB1 Gain = 0 dB1 Gain = 30 dB1 Gain = 31 dB1
0 X 1 1 1 1 1 1 1
Preliminary and Proprietary
1
Typical gain at +25C, VCC = +5V, Fin = 20 MHz
DS-00010 Rev 1.2 -- December 2000 Page 9 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
CATV APPLICATIONS
Table 6 PARAMETER
CS to SCK rise setup time CS to SCK rise hold time
Timing Characteristics SYMBOL
tSENS tSENH tSDAS tSDAH tDATAH tDATAL tSCKH tSCKL
MIN
10 20 10 20 50 50 50 50
TYP
MAX
UNITS
ns ns ns ns ns ns ns ns
SDA to SCK setup time SDA to SCK hold time SDA pulse width high SDA pulse width low SCK pulse width high SCK pulse width low
Preliminary and Proprietary
tSENS
tDATAH/ tDATAL
tSDAS
tSDAH
tSCKL tSCKH
tSENH
CS
SCLK
SDA
D7
D6
D5
D4
D3
D2
D1
D0
Figure 13 Serial Interface Timing Diagram
DS-00010 Rev 1.2 -- December 2000 Page 10 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 9 TERMINAL CONNECTIONS
Terminal connections for the MT1530 are described in Table 7. Table 7 PIN
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
CATV APPLICATIONS
Terminal Connections DESCRIPTION
Ground connection +5V Power supply for the input amplifier, variable attenuator, and serial interface. Bypass to GND1 with a 0.1 F decoupling capacitor as close to the part as possible. No connect Ground connection for the input amplifier and variable attenuator Positive input to the input amplifier Negative input to the input amplifier. Bypass with capacitor if driving amplifier single-ended. Ground connection to serial interface Chip select input to serial interface (active low) Data input to serial interface (active high) Clock input to serial interface (positive-edge triggered) No connect Shutdown mode input (active low) No connect Output common-mode bypass. Bypass to GND2 with 0.1 F capacitor. PA negative output PA positive output No connect PA output enable input (active high) +5V Power supply for PA bias and control circuitry. Bypass to GND2 with a 0.1 F decoupling capacitor as close to the part as possible. Ground connection for the PA
FUNCTION/ SYMBOL
GND VCC1 NC GND1 VIN+ VINDGND
Preliminary and Proprietary
CS
SDA SCLK NC
SHDN
NC VCM VOUTVOUT+ NC TXEN VCC2 GND2
DS-00010 Rev 1.2 -- December 2000 Page 11 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 10 PIN CONFIGURATION
Top View
CATV APPLICATIONS
GND VCC1 NC GND1 VIN+ VINDGND CS SDA SCLK
1 2 3 4 5 6 7 8 9 10
20 19 18 17
GND2 VCC2 TXEN NC VOUT+ VOUTVCM NC SHDN NC
MT1530
16 15 14 13 12 11
Preliminary and Proprietary
Figure 14 Pin Diagram
DS-00010 Rev 1.2 -- December 2000 Page 12 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET 11 PACKAGE DRAWING
SEE:V.T"D" SEE: V.T"S" C L
3 2 1
CATV APPLICATIONS
AA ONLY 0.045" DIA AB/AC/AD ONLY 0.016 X 45 0.010 0.157 MAX 0.150 MIN 0.244 MAX 0.228 MIN
0.118 C L
C L
C L 0.035 MAX 0.016 MIN
2X 2X
0.003 N 0.010
C L D/2
0.010 8 MAX 0 MIN
Preliminary and Proprietary
TOP VIEW
0.061 MAX 0.055 MIN 0.025 CC LL
0.005 H PARTING LINE
END VIEW
0.012 MAX 0.008 MIN
0.068 MAX 0.061 MIN
0.009 MAX 0.007 MIN 0.010 MAX 0.007 MIN
SEATING PLANE 0.004
SEE DETAIL "C"
0.0098 MAX 0.004 MIN WITH PLATING
0.011 MAX 0.008 MIN
BASE METAL
SIDE VIEW
CONTROLLING DIMENSION: INCHES
VARIATIONS AA AB AC AD MIN. 0.189 0.337 0.337 0.386 V.T."D" MAX. NOM. 0.196 0.194 0.344 0.342 0.342 0.344 0.391 0.393 MIN. 0.002 0.050 0.025 0.025
DETAIL "C"
V.T."S" NOM. MAX. 0.005 0.007 0.053 0.055 0.028 0.030 0.028 0.030
N 16 20 24 28
THIS PACKAGE MEETS JEDEC REGISTRATION MO-137AA-AF EXCEPT FOR THE PKG THICKNESS, DIM 0.061 MAX.
Figure 15 MT1530 Package Drawing
DS-00010 Rev 1.2 -- December 2000 Page 13 of 14
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
CATV APPLICATIONS
NOTICES
NOTICE - The information in this document is believed to be accurate and reliable. Microtune assumes no responsibility for any consequences arising from the use of this information, nor from any infringement of patents or the rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or other rights of Microtune. The information in this publication replaces and supersedes all information previously supplied, and is subject to change without notice. The customer is responsible for assuring that proper design and operating safeguards are observed to minimize inherent and procedural hazards. Microtune assumes no responsibility for applications assistance or customer product design.
Preliminary and Proprietary
NOTICE - The devices described in this document are not authorized for use in medical, life-support equipment, or any other application involving a potential risk of severe property or environmental damage, personal injury, or death without prior express written approval of Microtune. Any such use is understood to be entirely at the user's risk. TRADEMARKS - Microtune, MicroTuner, and the Microtune logo are trademarks of Microtune, Inc. All other trademarks belong to their respective companies. PATENTS - This product is manufactured and protected by the following U.S. patents: 5,805,988; 5,739,730; 5,625,325; 5,737,035; 5,648,744; 5,717,730; 5,847,612; 6,104,242; 6,100,761; 6,144,402; and additional patents pending or filed. COPYRIGHT - Entire contents Copyright (c) 2000 Microtune, Inc.
World Headquarters
Microtune, Inc. 2201 Tenth Street Plano, TX 75074
Telephone: 972-673-1600 Fax: 972-673-1602 Email: sales@microtune.com Website: www.microtune.com Telephone: +49-841-9378-011 Fax: +49-841-9378-010 Sales Telephone: +49-841-9378-020 Sales Fax: +49-841-9378-024 Telephone: +852-2378-8128 Fax: +852-2302-0756
European Headquarters
Microtune GmbH and Co. KG Marie Curie Strasse 1 85055 Ingolstadt / Germany Pan-Asian Headquarters Microtune, Inc. - Hong Kong Silvercord Tower 1, Room 503 30 Canton Road Kowloon, Hong Kong
For a detailed list of current sales representatives, visit our Web site at www.microtune.com.
DS-00010 Rev 1.2 -- December 2000 Page 14 of 14

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