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AD9944 Datasheet(PDF) 16 Page - Analog Devices

Part # AD9944
Description  Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9944 Datasheet(HTML) 16 Page - Analog Devices

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AD9943/AD9944
Rev. B | Page 16 of 20
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.
()
(
)
dB
3
.
5
dB
035
.
0
dB
+
×
=
Code
VGA
Gain
VGA
VGA GAIN REGISTER MODE
42
12
383
127
0
30
255
36
34
18
6
511
639
767
895
1023
Figure 13. VGA Gain Curve



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