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PDF MT1530 Data sheet ( Hoja de datos )
| Número de pieza | MT1530 | |
| Descripción | UPSTREAM AMPLIFIER | |
| Fabricantes | ETC | |
| Logotipo |  |
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M I C R O T U N E™
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
1 APPLICATIONS
• Cable modems
• Telephony over cable
• Set-top box CATV
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
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 µA.
The MT1530 is available in a 20-pin SSOP package for the extended industrial
temperature range of -40°C to +85°C.
DS-00010
Rev 1.2 — December 2000
Page 1 of 14
1 page  
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
-40
Vin = 34 dBmV
-45
-50
-55
65 MHz
-60
30 MHz
-65
50 51 52 53 54 55 56 57 58 59 60 61 62 63
Gain Code
Figure 7 Third-Order Harmonic Distortion vs. Gain
Code
69
68
20 MHz
67
42 MHz
66
65
65 MHz
64
63
62
61
52 53 54 55 56 57 58 59 60 61 62 63
Gain Code
Figure 8 Output 1 dB Compression Point vs. Gain
and Frequency
1.0E-06
1.0E-07
1.0E-08
1.0E-09
0
5 10 15 20 25 30 35 40 45 50 55 60
Gain Code
Figure 9 Output Noise vs. Gain Code
110
100
90
80
70
60
50
40
30
20
0
5 10 15 20 25 30 35 40 45 50 55 60
Gain Code
Figure 10 Power Supply Current vs. Gain Code
10
Z0 = 75 Ohms
15
20
25
30
35
5
15 25 35 45 55 65 75 85
Frequency ( MHz )
Figure 11 Output Return Loss vs. Frequency
95
DS-00010
Rev 1.2 — December 2000
Page 5 of 14
5 Page 
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
9 TERMINAL CONNECTIONS
Terminal connections for the MT1530 are described in Table 7.
Table 7 Terminal Connections
PIN FUNCTION/
SYMBOL
DESCRIPTION
1
GND
Ground connection
+5V Power supply for the input amplifier, variable attenuator, and serial
2
VCC1
interface. Bypass to GND1 with a 0.1 µF decoupling capacitor as close to
the part as possible.
3 NC No connect
4
GND1
Ground connection for the input amplifier and variable attenuator
5
VIN+
Positive input to the input amplifier
6
VIN-
Negative input to the input amplifier. Bypass with capacitor if driving
amplifier single-ended.
7
DGND
Ground connection to serial interface
8 CS Chip select input to serial interface (active low)
9
SDA
Data input to serial interface (active high)
10
SCLK
Clock input to serial interface (positive-edge triggered)
11 NC No connect
12
SHDN
Shutdown mode input (active low)
13 NC No connect
14
VCM
Output common-mode bypass. Bypass to GND2 with 0.1 µF capacitor.
15
VOUT-
PA negative output
16
VOUT+
PA positive output
17 NC No connect
18
TXEN
PA output enable input (active high)
19
VCC2
+5V Power supply for PA bias and control circuitry. Bypass to GND2 with a
0.1 µF decoupling capacitor as close to the part as possible.
20
GND2
Ground connection for the PA
DS-00010
Rev 1.2 — December 2000
Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MT1530.PDF ] | |
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