LT1007CP datasheet(17/24 Pages) TI

17 / 24 page

LT1007, LT1007A, LT1037, LT1037A

LOW-NOISE, HIGH-SPEED, PRECISION OPERATIONAL AMPLIFIERS

SLOS017C – D3195, FEBRUARY 1989 – REVISED JANUARY 1993

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

4.7 k

Ω

4.7 k

Ω

IN –

IN +

VCC –

OUT

VCC +

1 k

Ω

10 k

Ω

VCC +

OUT

VCC –

IN +

IN –

Figure 35. Standard Adjustment

Figure 36. Improved Sensitivity

Adjustment

The circuit shown in Figure 37 can be used to measure offset voltage. In addition, with the supply voltages

increased to

± 20 V, it can be used as the burn-in configuration for the LT1007 and LT1037.

When RF ≤ 100 Ω and the input is driven with a fast large-signal pulse (> 1 V), the output waveform will be as

shown in Figure 38.

During the fast-feedthrough-like portion of the output, the input protection diodes effectively short the output to

the input and a current, limited only by the output short-circuit protection, is drawn by the signal generator. When

RF is ≥ 500 Ω, the output is capable of handling the current requirements (IL ≤ 20 mA at 10 V), the amplifier stays

in its active mode, and a smooth transition occurs.

When RF is > 2 kΩ, a pole will be created with RF and the amplifier’s input capacitance, creating additional phase

shift and reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with RF will eliminate this

problem.

2.8 V /

µs

Output

–

VO = 1000 VOS

50 k

Ω

100

Ω

50 k

Ω†

15 V

– 15 V

† Resistors must have low thermoelectric potential

Figure 37. Test Circuit for Offset

Figure 38. Pulse Operation

Voltage and Offset Voltage Drift With

Temperature

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