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參數(shù)資料
| 型號(hào)： | MAX3558 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quad-Output LNA with AGC for Cable TV Applications |
| 中文描述： | 四輸出LNA，帶有AGC，適用于有線電視應(yīng)用 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 398K |
| 代理商： | MAX3558 |
M
Detailed Description
Programmable-Gain Amplifier
The PGA consists of the variable-gain amplifier (VGA)
and the digital-to-analog converter (DAC), which pro-
vide better than 56dB of output-level control in 0.5dB
steps. The PGA is implemented as a programmable
Gilbert-cell attenuator. The gain of the PGA is deter-
mined by a 7-bit word (D6
–
D0) programmed through
the serial data interface (Tables 1 and 2).
Specified performance is achieved when the input is
driven differentially. The device may be driven single
ended. To drive the device in this manner, one of the
input pins must be capacitively coupled to ground. Use
a capacitor value large enough to allow for a low-
impedance path to ground at the lowest frequency of
operation. For operation down to 5MHz, a 0.001μF
capacitor is recommended.
Output Amplifiers
The output amplifiers are Class A differential amplifiers,
capable of driving 61dBmV (QPSK) differentially. This
architecture provides superior even-order distortion
performance but requires that a transformer be used to
convert to a single-ended output. In transmit-disable
mode, the output amplifiers are powered down. A resis-
tor is placed across the output, so that the output
impedance remains matched when the amplifier is in
transmit-disable mode. Disabling the output devices
also results in low output noise.
To match the output impedance to a 75
load, the trans-
former must have a turns ratio of 1:1. The differential
amplifier is biased directly from the 3.3V supply using the
center tap of the output transformer. This provides a sig-
nificant benefit when switching between transmit mode
and transmit-disable mode. Stored energy due to bias
currents cancels within the transformer and prevents
switching transients from reaching the load.
Serial Interface
The serial interface has an active-low enable (
CS
) to
bracket the data, with data clocked in MSB first on the
rising edge of SCLK. Data is stored in the storage latch
on the rising edge of
CS
. The serial interface controls
the state of the PGA and the output amplifiers. Tables 1
and 2 show the register format. Serial-interface timing is
shown in Figure 1.
Upstream CATV Amplifier
8
_______________________________________________________________________________________
Functional Diagram
MAX3503
GND
SDA SCLK
OUT-
OUT+
IN+
IN-
V
CC
TXEN
SHDN
CEXT
BIAS
CONTROL
HIGH
POWER
LOW
NOISE
D/A CONVERTER
SERIAL DATA INTERFACE
CS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3558CGI+ | 制造商:Maxim Integrated Products 功能描述:QUAD-OUTPUT LNA WITH AGC FOR CABLE TV APPLICA - Rail/Tube |
| MAX3558CGI+T | 制造商:Maxim Integrated Products 功能描述:QUAD-OUTPUT LNA WITH AGC FOR CABLE TV APPLICA - Tape and Reel |
| MAX3558CTI+ | 功能描述:射頻放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測(cè)試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3558CTI+T | 功能描述:射頻放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測(cè)試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3558EVKIT | 功能描述:射頻開發(fā)工具 MAX3558 Eval Kit RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評(píng)估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
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