VS = VSOUT = ±15V

VICM = VREF = 0V

VINDIFF = ±1.8V

G = 8V/V

Figure 8-7. Current Consumption versus

Differential Input Voltage

VS = VSOUT = ±15V

VICM = VREF = 0V

VINDIFF = ±0.9V

G = 16V/V

Figure 8-8. Current Consumption versus

Differential Input Voltage

8.2 Typical Applications

8.2.1 Driving a Single-Ended Input SAR ADC

Figure 8-9 shows the schematic for a 16-bit, precision, 1MSPS, successive approximation register (SAR),

analog-to-digital converter (ADC). This circuit is used to measure the driving capability of the PGA849 with the

ADS8860 single-ended input ADC.

ADS8860

Single-Ended

SAR ADC

INP

INN

5.3V

AVSS

REF6250

5.0V

Reference

RDIV1

±0.05%

10k

REF6050

5.0V

Reference

1k

OPA192

+

–

RISO

20

RF

2k

5.3V

IN+

IN–

10pF

10pF

15V

100nF

–15V

100nF

DA_IN–

+

OUT

IN+

IN–

DA_IN+

+

PGA849

+

Gain Network

A0

A1

A2

A0

A1

A2

Overvoltage

Protection

Overvoltage

Protection

VS+

DGND

–

–

–

REF

LVDD

VS–

LVSS

5.3V

1µF

REFIN

PGA849

REF Voltage

2.5V

100pF

100nF

CFB

100pF

CFB

100pF

22µF

0.22

CCM

120pF

RFIL

15

CDIFF

1.2nF

RFIL

15

CCM

120pF

22nF

10nF

RDIV2

±0.05%

10k

CF

2200pF

100nF

100

100

5k

5k

5k

5k

Figure 8-9. Driving the ADS8860 SAR ADC

www.ti.com

PGA849

SBOSAG3A – MARCH 2024 – REVISED DECEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

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