INA2132 datasheet(8/19 Pages) TI2

8 / 19 page

INA2132

12 (10)

13 (9)

14 (8)

INA2132

ADS7806(1)

2 (6)

3 (5)

+5V

–In

12 Bits

Out

0V-4V

Input

+In

S = 45µs (4V Step to 0.01%)

NOTE: (1) For 16-bit output, use ADS7809.

FIGURE 4. Differential Input Voltage-to-Current Converter

for Low IOUT.

FIGURE 5. Differential Input Data Acquisition.

FIGURE 3. Low Power, High Output Current Precision

Difference Amplifier.

CAPACITIVE LOAD DRIVE CAPABILITY

The INA2132 can drive large capacitive loads, even at low

supplies. It is stable with a 10nF load. Refer to the “Small-

Signal Step Response” and “Settling Time vs Load Capaci-

tance” typical performance curves.

CHANNEL CROSSTALK

The two channels of the INA2132 are completely indepen-

dent, including all bias circuitry. At dc and low frequency,

there is virtually no signal coupling between channels.

Crosstalk increases with frequency and is dependent on

source impedance and signal characteristics. See the typical

performance curve “Channel Separation vs Frequency” for

more information.

Most crosstalk is produced by capacitive coupling of signals

from one channel to the input section of the other channel.

To minimize coupling, separate the input traces as far as

practical from any signals associated with the opposite

channel. A grounded guard trace surrounding the inputs

helps reduce stray coupling between channels. Run the

differential inputs of each channel parallel to each other or

directly adjacent on the top and bottom sides of a circuit

board. Stray coupling then produces a common-mode signal

which is rejected by the INA2132’s input.

12 (10)

13 (9)

14 (8)

INA2132

BUF634

2 (6)

3 (5)

–In

+In

(Low I

Q mode)

BUF634 inside feedback

loop contributes no error.

12 (10)

13 (9)

3 (5)

INA2132

2 (6)

14 (8)

Load

O = (V3 – V2)/R

12 (10)

13 (9)

3 (5)

14 (8)

INA2132

2 (6)

DG188

Logic

Logic In

–V

FIGURE 6. Digitally Controlled Gain of

±1 Amplifier.

FIGURE 7. Precision Voltage-to-Current Converter with

Differential Inputs.

12 (10)

13 (9)

3 (5)

INA2132

2 (6)

14 (8)

Load

O = (V1 – V2) (1/40k + 1/R)

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