DAC7541ASH-BI

更新时间： 2024-01-04 06:52:45

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DAC7541ASH-BI 数据手册

DIGITALLY CONTROLLED GAIN BLOCK

The DAC7541A may be used in a digitally controlled gain

block as shown in Figure 7. This circuit gives a range of gain

from one (all bits = one) to 4096 (LSB = one). The transfer

function is:

Bits 1 to 12

V_IN

V_DD

DAC7541A

–V_IN

V_OUT

B₁

B₂

B₃

B₁₂

+ • • • +

(

)

4096

All bits off is an illegal state, as division by zero is impos-

sible (no op amp feedback). Also, errors increase as gain

increases, and errors are minimized at major carries (only

one bit on at a time).

V_OUT

OPA604

FIGURE 7. Digitally Programmable Gain Block.

DAC7541A

1...5 6 78

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