OPA2832 datasheet(20/37 Pages) NSC

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APPLICATIONS INFORMATION

WIDEBAND VOLTAGE-FEEDBACK

1/2

OPA2832

S = +3.3V

OUT

66.5

Ω

1.13k

Ω

255

Ω

150

Ω

0.75V

6.8

µF

0.1

µF

0.1

µF

400

Ω

400

Ω

+0.75V

+0.75

1/2

OPA2832

S = +5V

OUT

66.7

Ω

505

Ω

S/2

332

Ω

150

Ω

6.8

µF

0.1

µF

0.1

µF

400

Ω

400

Ω

OPA2832

SBOS327C – FEBRUARY 2005 – REVISED AUGUST 2008 ............................................................................................................................................. www.ti.com

ground. Voltage swings reported in the Electrical

Characteristics are taken directly at the input and

output pins. For the circuit of Figure 62, the total

OPERATION

effective load on the output at high frequencies is

The OPA2832 is a unity-gain stable, very high-speed

150

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

voltage-feedback op amp designed for single-supply

noninverting input provide the common-mode bias

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

voltage. Their parallel combination equals the DC

input voltages below ground and to within 1.7V of the

resistance at the inverting input RF), reducing the DC

positive supply. The complementary common-emitter

output offset due to input bias current.

output stage provides an output swing to within 25mV

of ground and the positive supply. The OPA2832 is

compensated to provide stable operation with a wide

range of resistive loads.

Figure 61 shows the AC-coupled, gain

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 61, the total

effective load on the output at high frequencies is

150

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

noninverting input provide the common-mode bias

voltage. Their parallel combination equals the DC

resistance at the inverting input RF), reducing the DC

output offset due to input bias current.

Figure 62. AC-Coupled, G = +2, +3V Single-Supply

Specification and Test Circuit

Figure 63 shows the DC-coupled, gain of +2, dual

power-supply circuit configuration used as the basis

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 63, the total

effective load will be 150

Ω || 800Ω. Two optional

components are included in Figure 63. An additional

resistor

(175

Ω) is

included

series

with

the

noninverting input. Combined with the 25

Ω DC

source resistance looking back towards the signal

generator, this gives an input bias current cancelling

resistance that matches the 200

Ω source resistance

Figure 61. AC-Coupled, G = +2, +5V Single-Supply

seen at the inverting input (see the DC Accuracy and

Specification and Test Circuit

Offset Control section). In addition to the usual

power-supply decoupling capacitors to ground, a

Figure 62 shows the AC-coupled, gain

0.01

µF capacitor is included between the two

configuration used for the +3.3V Specifications and

power-supply pins. In practical PC board layouts, this

Typical Characteristic Curves. For test purposes, the

optional

capacitor

will

typically

improve

the

input impedance is set to 66.5

Ω with a resistor to

2nd-harmonic distortion performance by 3dB to 6dB.

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