OPA2832 datasheet(18/32 Pages) BURR-BROWN

18 / 32 page

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APPLICATION INFORMATION

WIDEBAND VOLTAGE-FEEDBACK

1/3

OPA3832

V =+3.3V

OUT

66.5W

1.13kW

255W

150W

0.75V

6.8 F

0.1 F

400W

+0.75V

+0.75

1/3

OPA3832

V =+5V

OUT

66.7W

505W

+2V

332W

150W

+2V

6.8 F

0.1 F

400W

OPA3832

SBOS370 – DECEMBER 2006

effective load on the output at high frequencies is

150

Ω || 800Ω. The 255Ω and 1.13kΩ resistors at the

noninverting input provide the common-mode bias

OPERATION

voltage. This parallel combination equals the dc

The OPA3832 is a unity-gain stable, very high-speed

resistance at the inverting input RF), reducing the dc

voltage-feedback op amp designed for single-supply

output offset arising from input bias current.

operation (+3V to +11V). The input stage supports

input voltages below ground and to within 1.7V of the

positive supply. The complementary common-emitter

output stage provides an output swing to within

25mV of ground and the positive supply. The

OPA3832

compensated

provide

stable

operation with a wide range of resistive loads.

Figure 46 shows the ac-coupled, gain of +2V/V

configuration used for the +5V Specifications and

Typical Characteristic Curves. For test purposes, the

input impedance is set to 50

Ω with the 66.7Ω resistor

to ground in parallel with the 200

Ω bias network.

Voltage

swings

reported

the

Electrical

Characteristics are taken directly at the input and

output pins. For the circuit of Figure 46, the total

Figure 47. AC-Coupled, G = +2, +3.3V

effective load on the output at high frequencies is

Single-Supply Specification and Test Circuit

150

Ω || 800Ω. The 332Ω and 505Ω resistors at the

noninverting input provide the common-mode bias

voltage. This parallel combination equals the dc

Figure 48 shows the dc-coupled, gain of +2, dual

resistance at the inverting input RF), reducing the dc

power-supply circuit configuration used as the basis

output offset resulting from input bias current.

of the ±5V Electrical Characteristics and Typical

Characteristics.

For

test

purposes,

the

input

impedance is set to 50

Ω with a resistor to ground

and the output impedance is set to 150

Ω with a

series output resistor. Voltage swings reported in the

specifications are taken directly at the input and

output pins. For the circuit of Figure 48, the total

effective load will be 150

Ω || 800Ω. Two optional

components are included in Figure 48. An additional

resistor (175

Ω) is included in series with the

noninverting input. Combined with the 25

Ω dc source

resistance looking back towards the signal generator,

this

configuration

gives

input

bias

current

cancelling resistance that matches the 200

Ω source

resistance seen at the inverting input (see the DC

Accuracy and Offset Control section). In addition to

the usual power-supply decoupling capacitors to

Figure 46. AC-Coupled, G = +2, +5V

ground, a 0.01

µF capacitor is included between the

Single-Supply Specification and Test Circuit

two power-supply pins. In practical printed circuit

board (PCB) board layouts, this optional capacitor

Figure 47 shows the ac-coupled, gain of +2V/V

will typically improve the 2nd-harmonic distortion

configuration used for the +3.3V Specifications and

performance by 3dB to 6dB.

Typical Characteristic Curves. For test purposes, the

input impedance is set to 66.5

Ω with a resistor to

ground. Voltage swings reported in the Electrical

Characteristics are taken directly at the input and

output pins. For the circuit of Figure 47, the total

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