OPA541

V

OUT

+35V

–35V

DAC702

0.5Ω

–30V to

+30V

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Digital Word

Input

MSB

LSB

100pF

=

+15V

–15V

5kΩ

1µF

OPA27

10kΩ*

*

+15V

–15V

23

18

19

20

10kΩ

FB

±1mA

* TCR

Tracking

Resistors

21

17

6

7

4

1µF

1µF

1µF

1µF

1µF

2

3

OPA541

SBOS153B – SEPTEMBER 2000 – REVISED JANUARY 2016

www.ti.com

Typical Applications (continued)

8.2.4 16-Bit Programmable Voltage Source

The 16-bit voltage source achieves its precision by using an OPA27 along with precision resistors in a feedback

path that provides high overall accuracy.

Figure 17. 16-Bit Programmable Voltage Source

8.2.4.1 Design Requirements

Design requirements for the programmable voltage source shown in Figure 17:

•

±30-V output programmable to 16-bit resolution

•

> ±1.5-A current capability

•

< 500-

μV offset at zero output

•

linearity error less than ±0.0015%

•

differential linearity error less than ±0.003%

14

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