VIN, Differential Input Voltage (V)

-15

-12

-9

-6

-3

0

3

6

9

12

15

-15

-12

-9

-6

-3

0

3

6

9

12

15

I(Vs+)

I(Vs–)

I(IN+)

I(IN–)

VS = VSOUT = ±15V

VICM = VREF = 0V

G = 50V/V

VIN linear limits = ±0.58V

Figure 8-7. Current Consumption versus

Differential Input Voltage

VIN, Differential Input Voltage (V)

-5

-4

-3

-2

-1

0

1

2

3

4

5

-15

-12

-9

-6

-3

0

3

6

9

12

15

I(Vs+)

I(Vs–)

I(IN+)

I(IN–)

VS = VSOUT = ±15V

VICM = VREF = 0V

G = 100V/V

VIN linear limits = ±0.29V

Figure 8-8. Current Consumption versus

Differential Input Voltage

8.2 Typical Application

8.2.1 ADS127L11 and ADS127L21B, 24-Bit, Delta-Sigma ADC Driver Circuit

The application circuit in Figure 8-9 shows a schematic for a 24-bit wide-bandwidth, delta-sigma ADC. The

ADS127Lx1 ADC offers two digital filters to optimize ac applications (wideband filter) or dc applications (sinc4

filter). Table 8-2 and Table 8-3 show measurement results in both filter settings. For a detailed design procedure

to operate the ADS127Lx1 ADC, see the ADS127Lx1EVM-PDK evaluation module user's guide.

+

–

OUT+

IN

IN+

OUT

VOCM

6.67k

3.33k

3.33k

6.67k

ADS127L21B

INP

INN

FDA_IN

FDA_IN+

PGA854

+

–

VIN+

VIN

VOUT = G × VIN

VIN = VIN+

VIN

+

VOUT

Gain Network

A0

A1

A2

A0

A1

A2

VDGND

DGND

VREF

AVDD

CFB

680pF

CFB

680pF

RFIL

47.4

RFIL

47.4

CDIFF

470pF

CCM

47pF

CCM

47pF

1k

1000pF

ADS127L21B

VCM Pin

VS+

VS

15V

100nF

5V

5V

15V

100nF

LVDD

LVSS

AVSS

4.096V

RFIL_Optional

RFIL_Optional

CIN_DIFF

10 ×

CIN_CM

1 ×

CIN_CM

1 ×

100nF

3.16k

3.16k

4.7nF

470pF

470pF

Figure 8-9. Driving the ADS127Lx1 Delta-Sigma ADC

www.ti.com

PGA854

SBOSAN2A – AUGUST 2025 – REVISED DECEMBER 2025

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