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SLOS065D − MARCH 1991 − REVISED APRIL 2002
D
D
D
2.5-V Virtual Ground for 5-V/GND Analog
Systems
D
Excellent Regulation Characteristics
− Output Regulation
−45 µV Typ at I = 0 to −10 mA
O
High Output-Current Capability
Sink or Source . . . 20 mA Typ
+15 µV Typ at I = 0 to +10 mA
O
− Input Regulation = 1.5 µV/V Typ
Low-Impedance Output . . . 0.0075 Ω Typ
Macromodel Included
Micropower Operation . . . 170 µA Typ
D
D
description
OUTPUT REGULATION
100
In signal-conditioning applications using a single
V = 5 V
I
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.
80
60
T
= −40°C
A
T
= 0°C
A
40
T
A
= −55°C
20
0
T
= 125°C
= 25°C
A
T
A
= 25°C
T
A
−20
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.
−40
−60
−80
T
= 125°C
A
T
A
= −55°C
−100
−10
−8 −6 −4 −2
0
2
4
8
10
6
I
− Output Current − mA
O
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
PLASTIC
TO-226AA
(LP)
SMALL OUTLINE
T
A
(D)
0°C to 70°C
−40°C to 85°C
−55°C to 125°C
TLE2425CD
TLE2425ID
TLE2425MD
TLE2425CD
TLE2425ID
—
†
The D package is available taped and reeled. Add R suffix to
the device type (e.g., TLE2425CDR).
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.
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Copyright 2002, Texas Instruments Incorporated
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