OPA734AIDRG4 datasheet(9/23 Pages) BURR-BROWN

Part #	OPA734AIDRG4

Description	0.05uV/?C max, SINGLE-SUPPLY CMOS OPERATIONAL AMPLIFIERS

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Manufacturer	BURR-BROWN [Burr-Brown (TI)]

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OPA734, OPA2734

OPA735, OPA2735

SBOS282B − DECEMBER 2003 − REVISED FEBRUARY 2005

www.ti.com

9

Low-gain (< 20) operation demands that the auto-zero

circuitry correct for common-mode rejection errors of the

main amplifier. Because these errors can be larger than

0.1% of a full-scale input step change, one calibration

cycle (100

µs) can be required to achieve full accuracy.

The term clock feedthrough describes the presence of the

clock frequency in the output spectrum. In auto-zeroed op

amps, clock feedthrough may result from the settling of the

internal sampling capacitor, or from the small amount of

charge injection that occurs during the sample-and-hold of

the op amp offset voltage. Feedthrough can be minimized

by keeping the source impedance relatively low (< 1k

Ω)

and matching the source impedance on both input

terminals. If the source resistance is high (> 1k

Ω)

feedthrough can generally be reduced with a capacitor of

1nF or greater in parallel with the source or feedback

resistors. See the circuit application examples.

LAYOUT GUIDELINES

Attention to good layout practices is always recom-

mended. Keep traces short. When possible, use a PCB

ground plane with surface-mount components placed as

close to the device pins as possible. Place a 0.1

µF

capacitor closely across the supply pins. These guidelines

should be applied throughout the analog circuit to improve

performance and provide benefits such as reducing the

electromagnetic-interference (EMI) susceptibility.

R

1

V

EX

V

OUT

V

REF

R

1

OPA734

R

RR

+10V

1nF

Figure 2. Single Op Amp Bridge Amplifier Circuit

1/2

OP A 2735

R

3

10k

Ω

R

3

10k

Ω

R

1

1k

Ω

1/2

OP A 2735

R

2

1k

Ω

C

4

1nF

C

4

1nF

R

G

10V

C

1

(1)

1nF

C

2

(1)

10nF

C

3

(1)

1nF

V

REF = 15V

2

4

6

REF102

NOTE: (1) Place close to input pins.

R

RR

G= 1 + 2

R

3

R

G

Figure 3. Differential Output Bridge Amplifier

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OPA734AIDRG4 Datasheet(PDF) 9 Page - Burr-Brown (TI)

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