AD9944 データシートの表示（PDF） - Analog Devices

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AD9944

Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors

Analog Devices 

AD9943/AD9944

A/D CONVERTER

The ADC uses a 2 V input range. Better noise performance

results from using a larger ADC full-scale range. The ADC uses

a pipelined architecture with a 2 V full-scale input for low noise

performance.

VARIABLE GAIN AMPLIFIER

The VGA stage provides a gain range of 6 dB to 40 dB,

programmable with 10-bit resolution through the serial digital

interface. The minimum gain of 6 dB is needed to match a 1 V

input signal with the ADC full-scale range of 2 V. A plot of the

VGA gain curve is shown in Figure 13.

( ) VGA Gain(dB) = VGA Code × 0.035 dB + 5.3 dB

42

36

30

34

18

12

6

0

127 255 383 511 639 767 895 1023

VGA GAIN REGISTER MODE

Figure 13. VGA Gain Curve

Rev. B | Page 16 of 20

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