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參數資料
| 型號： | LMH6622MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Dual Wideband, Low Noise, 160MHz, Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 12/18頁 |
| 文件大小： | 540K |
| 代理商： | LMH6622MMX |
Test Circuits
(Continued)
20029255
5) Multitone Power Ratio, R
F
= 500
, R
G
= 174
, R
L
=
437
DSL Receive Channel Applications
The LMH6622 is a dual, wideband operational amplifier de-
signed for use as a DSL line receiver. In the receive band of
a Customer Premises Equipment (CPE) ADSL modem it is
possible that as many as 255 Discrete Multi-Tone (DMT)
QAM signals will be present, each with its own carrier fre-
quency, modulation, and signal level. The ADSL standard
requires a line referred noise power density of -140dBm/Hz
within the CPE receive band of 100KHz to 1.1MHz. The CPE
driver output signal will leak into the receive path because of
full duplex operation and the imperfections of the hybrid
coupler circuit. The DSL analog front end must incorporate a
receiver pre-amp which is both low noise and highly linear
for ADSL-standard operation. The LMH6622 is designed for
the twin performance parameters of low noise and high
linearity.
Applications ranging from +5V to +12V or
±
2.5V to
±
6V are
fully supported by the LMH6622. In Figure 2 the LMH6622 is
used as an inverting summing amplifier to provide both
received pre-amp channel gain and driver output signal can-
cellation, i.e., the function of a hybrid coupler.
20029223
FIGURE 1. ADSL Signal Description
L
www.national.com
12
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6622MMX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6624 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual Ultra Low Noise Wideband Operational Amplifier |
| LMH6624_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual Ultra Low Noise Wideband Operational Amplifier |
| LMH6624A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:ULTRA LOW NOISE WIDEBAND OP AMP |
| LMH6624J-QML | 制造商:Texas Instruments 功能描述:OP Amp Single Volt Fdbk ±6V/12V 8-Pin CDIP Rail |
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