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參數(shù)資料
| 型號： | LM98640W-MPR |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, CQFP68 |
| 封裝： | CERAMIC, QFP-68 |
| 文件頁數(shù)： | 20/50頁 |
| 文件大?。?/td> | 1688K |
| 代理商： | LM98640W-MPR |
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Programmable Gain
The LM98640QML provides two independent gain stages.
The first stage is in the input CDS/SH circuit. The second is
in the form of a Programmable Gain Amplifier (PGA).
CDS/SH Stage Gain
The CDS/SH gain is programmable to either 0dB or 6dB gain.
The load presented to the user in 6dB mode is roughly twice
the switched load of 0dB mode. The CDS/SH gain settings
affect both channels. The CDS/SH gain bit is located in bit 2
of the Main Configuration register, and programmable
through the serial interface.
PGA Gain Plots
The PGA has an 8-bit resolution with a gain range of -3dB to
18dB. Figure 13 below shows a plot for the gain. Each channel
has a independent PGA controlled by registers CH1 PGA and
CH2 PGA, and programmable through the serial interface.
30064714
FIGURE 13. PGA Gain vs. PGA Gain Code
27
www.national.com
LM98640QML
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