OPA650 datasheet(10/24 Pages) TI2

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APPLICATIONS INFORMATION

Wideband Voltage Feedback Operation

1/2

OPA2652

50W

402W

205W

57.6W

Source

+5V

-5V

49.9W

0.1 F

6.8 F

0.1 F

6.8 F

Load

1/2

OPA2652

+5V

-5V

Load

49.9W

174W

49.9W

Source

402W

6.8 F

0.1 F

6.8 F

0.1 F

OPA2652

SBOS125A – JUNE 2000 – REVISED MAY 2006

Voltage swings reported in the specifications are

taken directly at the input and output pins, while

The OPA2652 is a dual, low-power, wideband

output powers (dBm) are at the matched 50

Ω load.

voltage feedback operational amplifier. Each channel

For the circuit of Figure 28, the total effective load

is internally compensated to provide unity gain

will be 100

Ω || 804Ω. Two optional components are

stability. The OPA2652 voltage feedback architecture

included in Figure 28.

features true differential and fully symmetrical inputs.

This architecture minimizes offset errors, making the

An additional resistor (174

Ω) is included in series

OPA2652 well-suited for implementing filter and

with the noninverting input. Combined with the 25

Ω

instrumentation designs. As a

dual

operational

DC source resistance looking back towards the

amplifier, OPA2652 is an ideal choice for designs

signal generator, this additional resistor gives an

that require multiple channels where reduction of

input bias current cancelling resistance that matches

board space, power dissipation and cost are critical.

the 201

Ω source resistance seen at the inverting

Its AC performance is optimized to provide a gain

input (see the DC Accuracy and Offset Control

bandwidth product of 200MHz and a fast rise time of

section). In addition to the usual power-supply

2.0ns,

which

important

consideration

decoupling capacitors to ground, a 0.1

µF capacitor is

high-speed data conversion applications. The low

included between the two power-supply pins. In

DC input offset of

±1.5mV and drift of ±5µV/°C

practical printed circuit board (PCB) layouts, this

support high accuracy requirements. In applications

optional-added

capacitor

typically

improves

the

requiring a higher slew rate and wider bandwidth,

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

such

video

and

high

bit

rate

digital

Figure 29 shows the DC-coupled, gain of –1, bipolar

communications, consider the dual current feedback

supply circuit configuration that is the basis of the

OPA2694, or the OPA2691.

specifications and typical characteristics at G = –1.

Figure 28 shows the DC-coupled, gain of +2, dual

The input impedance matching resistor (57.6

Ω) used

power-supply circuit configuration used as the basis

for testing gives a 50

Ω input load. A resistor (205Ω)

of the

±5V specifications and typical characteristics.

connects the noninverting input to ground. This

This configuration is for one channel. The other

configuration provides the DC source resistance

channel is connected similarly. For test purposes, the

matching to cancel outputs errors arising from input

input impedance is set to 50

Ω with a resistor to

bias current.

ground and the output impedance is set to 50

Ω with

a series output resistor.

Figure 29. DC-Coupled, G = –1, Bipolar Supply,

Specification and Test Circuit

Figure 28. DC-Coupled, G = +2, Bipolar Supply,

Specification and Test Circuit

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