CMV2000 datasheet(40/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 39 of 63

5.11 POWER CONTROL

The power consumption of the CMV2000 can be regulated by disabling the LVDS data channels when they are not used

(in 8, 4 or 2 outputs mode). The power will decrease with approximately 18mW per channel. So reducing the outputs

from 16 to 4 will save you about 216mW or 33%. This is the main source for power saving.

10-bit or 12-bit mode

Default value

Description of the value

Channel_en

80[7:0]

81[7:0]

82[2:0]

All ’1’

Bit 0-15 enable/disable the data output channels

Bit 16 enables/disables the clock channel

Bit 17 enables/disables the control channel

Bit 18 enables/disbales the LVDS clock input

0: disabled

1: enabled

Decreasing the master clock frequency and thereby the LVDS clock frequency will also decrease power consumption

albeit little. Decreasing the LVDS_CLK frequency from 480MHz to 128MHz will decrease power consumption with about

25mW. All power savings will happen on the VDD20 supply. Other settings or factors have little to no effect on the

power consumption.

5.12 OFFSET AND GAIN

5.12.1 OFFSET

A digital offset can be applied to the output signal. This dark level offset can be programmed by setting the desired value

in the sequencer register. The 14 bit register value is a 2-complement number, allowing us to have a positive and a

negative offset (from 8191 to -8192). The ADC itself has a fixed offset of 70.

So the dark-level @ output = 70 + Offset (in 2’s complement). For example register value 16323 (11 1111 1100 0011)

equals -61 in 2’s complement. The default dark-level is thus set at 70 -61 = 9 digital numbers.

Offset

Default

value

Description of the value

Offset

100[7:0]

101[5:0]

16323

Defines the dark level offset applied to the output signal

(min = 0, max = 16383).

The value is in 2’s complement:

Decimal

Binary

2’s Comp.

00 0000 0000 0000

00 0000 0000 0001

…

8191

01 1111 1111 1111

8191

8192

10 0000 0000 0000

-8192

8193

10 0000 0000 0001

-8191

…

16383

11 1111 1111 1111

-1

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