TLE2425

PRECISION VIRTUAL GROUND

SLOS065D – MARCH 1991 – REVISED APRIL 2002

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Systems

Sink or Source . . . 20 mA Typ

– Output Regulation

– 45

+15

– Input Regulation = 1.5

µV/V Typ

description

In signal-conditioning applications using a single

power source, a reference voltage is required for

termination of all signal grounds. To accomplish

this, engineers have typically used solutions

consisting of resistors, capacitors, operational

amplifiers, and voltage references. Texas Instru-

ments has eliminated all of those components

with one easy-to-use 3-terminal device. That

device is the TLE2425 precision virtual ground.

Use of the TLE2425 over other typical circuit

solutions gives the designer increased dynamic

signal range, improved signal-to-noise ratio,

lower distortion, improved signal accuracy, and

easier interfacing to ADCs and DACs. These

benefits are the result of combining a precision

micropower voltage reference and a high-perfor-

mance precision operational amplifier in a single

silicon chip. It is the precision and performance of

these two circuit functions together that yield such

dramatic system-level performance.

The TLE2425 improves input regulation as well as output regulation and, in addition, reduces output impedance

and power dissipation in a majority of virtual-ground-generation circuits. Both input regulation and load

regulation exceed 12 bits of accuracy on a single 5-V system. Signal-conditioning front ends of data acquisition

systems that push 12 bits and beyond can use the TLE2425 to eliminate a major source of system error.

AVAILABLE OPTIONS

TA

SMALL OUTLINE

(D)

PLASTIC

TO-226AA

(LP)

0

°C to 70°C

TLE2425CD

TLE2425CD

–40

°C to 85°C

TLE2425ID

TLE2425ID

–55

°C to 125°C

TLE2425MD

—

† The D package is available taped and reeled. Add R suffix to

the device type (e.g., TLE2425CDR).

Copyright

 2002, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

80

–20

0

20

60

40

–40

–60

–80

– 100

10

8

–2

0

2

6

4

–4

–6

–8

–10

100

OUTPUT REGULATION

IO – Output Current – mA

VI = 5 V

TA = – 55°C

TA = 25°C

TA = 125°C

TA = – 40°C

TA = 125°C

TA = – 55°C

TA = 0°C

TA = 25°C