DAC8563SDGST datasheet(33/56 Pages) TI1

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O UT

REF

Gain

DAC8562, DAC8563

DAC8162, DAC8163

DAC7562, DAC7563

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SLAS719C

– AUGUST 2010 – REVISED JUNE 2011

GAIN REGISTERS

The gain register controls the GAIN setting in the DAC transfer function:

(2)

The DAC756x, DAC816x, and DAC856x have a gain register for each channel. The gain for each channel, in

Equation 2, is either 1 or 2. This gain is automatically set to 2 when using the internal reference, and is

automatically set to 1 when the internal reference is disabled (default). However, each channel can have either

gain by setting the registers appropriately. The gain registers are accessible by using command bits = 000 and

address bits = 010, and using DB1 for DAC-B and DB0 for DAC-A. See Table 13 or Table 14 and Table 15 for

the full command structure. The gain registers are automatically reset to provide either gain of 1 or 2 when the

internal reference is powered off or on, respectively. After the reference is powered off or on, the gain register is

again accessible to change the gain.

Table 14. Gain Register Command Structure

Command

Address

Data

DAC-B

DAC-A

DB23

DB0

Table 15. DAC-n Selection for Gain Register Command

DB1/DB0

Value

Gain

DB0

DAC-A uses gain = 2 (default with internal reference)

DAC-A uses gain = 1 (default with external reference)

DB1

DAC-B uses gain = 2 (default with internal reference)

DAC-B uses gain = 1 (default with external reference)

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