5 Device Comparison Table

DEVICE

DESCRIPTION

GAIN EQUATION

RG PINS AT PIN

INA849

Ultra-low-noise (1-nV/√Hz), high-bandwidth instrumentation amplifier

G = 1 + 6 kΩ / RG

2, 3

INA851

Low-noise (3.2 nV/√Hz), high-speed (22 MHz), fully-differential instrumentation

amp with overvoltage protection (±40 V)

G = 1 + 6 kΩ / RG

2, 3

PGA280

20-mV to ±10-V programmable gain instrumentation amplifier with 3-V or 5-V

differential output; analog supply up to ±18 V

Digitally programmable with SPI

N/A

PGA281

Zero-drift, high-voltage programmable gain amplifier

Digitally pin-programmable

N/A

6 Pin Configuration and Functions

1

A2

12

FDA_IN+

2

IN+

11

OUT–

3

IN–

10

OUT+

4

A0

9

FDA_IN–

Not to scale

Thermal Pad

Figure 6-1. RGT Package, 16-Pin VQFN (Top View)

Table 6-1. Pin Functions

PIN

TYPE

DESCRIPTION

NAME

NO.

A0

4

Input

Gain option pin 0

A1

5

Input

Gain option pin 1

A2

1

Input

Gain option pin 2

DGND

16

Power

Ground reference for digital logic and gain setting pins

FDA_IN–

9

Input

Connection to output driver summing node

FDA_IN+

12

Input

Connection to output driver summing node

IN–

3

Input

Negative (inverting) input

IN+

2

Input

Positive (noninverting) input

LVDD

7

Power

Output driver positive supply. Connect this pin to the positive supply of the ADC to protect from overdriving.

LVSS

14

Power

Output driver negative supply. Connect this pin to the negative supply of the ADC to protect from overdriving.

NC

8

—

Do not connect

OUT–

11

Output

Output (inverting)

OUT+

10

Output

Output (noninverting)

VOCM

13

Input

Level set for output common mode value

VS+

6

Power

Input stage positive supply

VS–

15

Power

Input stage negative supply

Thermal Pad

Thermal pad

—

The thermal pad must be soldered to the printed-circuit board (PCB). Connect thermal pad to a plane or large

copper pour that is either floating or electrically connected to VS–, even for applications that have low power

dissipation.

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PGA855

SBOSAE0B – APRIL 2023 – REVISED SEPTEMBER 2023

Copyright © 2023 Texas Instruments Incorporated

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