OPA2631U datasheet(11/18 Pages) TI1

Part #	OPA2631U

Description	Dual, Low-Power, Single-Supply OPERATIONAL AMPLIFIER

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Manufacturer	TI1 [Texas Instruments]

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OPA2631

11

SBOS067A

APPLICATIONS INFORMATION

WIDEBAND VOLTAGE-FEEDBACK OPERATION

The OPA2631 is a unity-gain stable, very high-speed, volt-

age-feedback op amp designed for single-supply operation

(+3V to +10V). The input stage supports input voltages

below ground, and to within 1.0V of the positive supply. The

complementary common-emitter output stage provides an

output swing to within 30mV of ground and 130mV of the

positive supply. It is compensated to provide stable opera-

tion with a wide range of resistive loads.

Figure 1 shows the AC-coupled, gain of +2 configuration

used for the +5V Specifications and Typical Performance

Curves. For test purposes, the input impedance is set to 50

Ω

with a resistor to ground. Voltage swings reported in the

Specifications are taken directly at the input and output pins.

For the circuit of Figure 1, the total effective load on the

output at high frequencies is 150

Ω || 1500Ω. The 1.50kΩ

resistors at the non-inverting input provide the common-

mode bias voltage. Their parallel combination equals the DC

resistance at the inverting input, minimizing the output DC

offset.

1/2

OPA2631

+V

S = 5V

V

OUT

53.6

Ω

V

IN

R

F

750

Ω

R

G

750

Ω

1.50k

Ω

1.50k

Ω

R

L

150

Ω

+V

S

2

6.8

µF

+

0.1

µF

0.1

µF

0.1

µF

FIGURE 1. AC-Coupled Signal—Resistive Load to Supply

Midpoint.

FIGURE 2. DC-Coupled Signal—Resistive Load to Supply

Midpoint.

1/2

OPA2631

+V

S = 3V

V

OUT

57.6

Ω

V

IN

374

Ω

2.26k

Ω

R

L

150

Ω

+V

S

2

6.8

µF

+

0.1

µF

R

F

750

Ω

R

G

562

Ω

Figure 2 shows the DC-coupled, gain of +2 configuration

used for the +3V Specifications and Typical Performance

Curves. For test purposes, the input impedance is set to 50

Ω

with a resistor to ground. Though not strictly a “rail-to-rail”

design, this part comes very close, while maintaining excel-

lent performance. It will deliver

≈ 2.9Vp-p on a single +3V

supply with 61MHz bandwidth. The 374

Ω and 2.26kΩ

resistors at the input level-shift VIN so that VOUT is within

the allowed output voltage range when VIN = 0. See the

typical performance curves for information on driving ca-

pacitive loads.

SINGLE-SUPPLY ADC CONVERTER INTERFACE

The front page shows a DC-coupled, single-supply, dual

ADC (Analog-to-Digital Converter) driver circuit. Many

systems are now requiring +3V supply capability of both the

ADC and its driver. The OPA2631 provides excellent per-

formance in this demanding application. Its large input and

output voltage ranges, and low distortion support converters

such as the ADS901 shown in this figure. The input level-

shifting circuitry was designed so that VIN can be between

0V and 0.5V, while delivering an output voltage of 1V to 2V

for the ADS901.

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