TLC27M4, TLC27M4A, TLC27M4B, TLC27M4Y, TLC27M9

LinCMOS

™ PRECISION QUAD OPERATIONAL AMPLIFIERS

SLOS093C – OCTOBER 1987 – REVISED MAY 1999

17

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

single-supply versus split-supply test circuits

Because the TLC27M4 and TLC27M9 are optimized for single-supply operation, circuit configurations used for

the various tests often present some inconvenience since the input signal, in many cases, must be offset from

ground. This inconvenience can be avoided by testing the device with split supplies and the output load tied to

the negative rail. A comparison of single-supply versus split-supply test circuits is shown below. The use of either

circuit gives the same result.

VDD

CL

RL

VO

VI

VI

VO

RL

CL

VDD+

VDD –

(a) SINGLE SUPPLY

(b) SPLIT SUPPLY

Figure 1. Unity-Gain Amplifier

VDD

VDD+

1/2 VDD

20

Ω

VO

2 k

Ω

20

Ω

VDD –

20

Ω

20

Ω

2 k

Ω

VO

(b) SPLIT SUPPLY

(a) SINGLE SUPPLY

Figure 2. Noise-Test Circuit

VDD

10 k

Ω

VO

100

Ω

CL

1/2 VDD

VI

VI

CL

100

Ω

VO

10 k

Ω

VDD+

VDD –

(b) SPLIT SUPPLY

(a) SINGLE SUPPLY

Figure 3. Gain-of-100 Inverting Amplifier