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參數資料
| 型號： | MT1530 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | UPSTREAM AMPLIFIER |
| 中文描述： | 上游放大器 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 427K |
| 代理商： | MT1530 |
DS-00010
Rev 1.2 — December 2000
Page 1 of 14
M I C R O T U N E
P
MT1530 U
PSTREAM
A
MPLIFIER
A
DVANCE
D
ATA
S
HEET
CATV A
PPLICATIONS
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
μ
A.
The MT1530 is available in a 20-pin SSOP package for the extended industrial
temperature range of -40°C to +85°C.
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