WM8143-12 データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8143-12

12-bit/4MSPS CCD Signal Processor

Wolfson Microelectronics plc 

WM8143-12

When the VS/RS control is activated the switch closes

and the effective impedance of the input is 1/CF where

the value of C changes from 0.3pF for minimum gain to

9.6pF for maximum gain and F is the sample frequency

in Hz. Table 2 illustrates the maximum and minimum

input impedance at different frequencies.

SAMPLING

FREQUENCY

(MHz)

IMPEDANCE

(MΩ) MIN

GAIN

IMPEDANCE

(KΩ) MAX

GAIN

0.5

6.6

208

1

3.3

104

2

1.6

52

4

0.8

26

Table 2 Effects of Frequency on Input Impedance

Calibration

To achieve optimum performance of the WM8143-12, a

calibration procedure must be implemented. This is

achieved by using a combination of the gain and offset

functions to amplify and shift the input signal so that it

lies within and maximises the input ADC range.

Production Data

Wolfson Microelectronics

12

PD. Rev 4 Nov. 99

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