TLE2662
DUAL µPOWER JFET-INPUT OPERATIONAL AMPLIFIER
WITH SWITCHED-CAPACITOR VOLTAGE CONVERTER
SLOS118B – DECEMBER 1992 – REVISED AUGUST 1994
DW PACKAGE
(TOP VIEW)
Single-Supply Operation With Rail-to-Rail
Inputs
= 0.000 V While Sinking 25 mA
V
OL
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1OUT
1IN–
1IN+
V
CC+
2OUT
Wide V
Range . . . 3.5 V to 15 V
CC
SCOUT Supplies up to 100 mA for External
Loads
2IN–
2IN+
CAP–
GND
CAP+
FB/SD
V
CC–
Shutdown Mode
SCOUT
SCREF
OSC
External 2.5-V Voltage Reference Available
description
SCIN
TheTLE2662offerstheadvantagesofJFET-input
operational amplifiers and rail-to-rail common-
mode input voltage range with the convenience of single-supply operation. By combining a switched-capacitor
voltage converter with a dual operational amplifier in a single package, Texas Instruments now gives circuit
designers new options for conditioning low-level signals in single-supply systems.
The TLE2662 features two low power, high-output drive JFET-input operational amplifiers with a switched-
capacitor building block. Using two external capacitors, the switched-capacitor network can be configured as
a voltage inverter, generating a negative supply voltage capable of sourcing up to 100 mA. This supply functions
not only as the amplifier negative rail but is also available to drive external circuitry. In this configuration, the
amplifier common-mode input voltage range extends from the positive rail to below ground, providing true
rail-to-rail inputs from a single supply. Furthermore, the outputs can swing to and below ground while sinking
over 25 mA. This feature was previously unavailable in operational amplifier circuits. The TLE2662 operational
amplifier section has output stages that can drive 100-Ω loads to 2.5 V from a 5-V rail. With a 10-kΩ load, the
output swing extends to 3.5 V and can include the positive rail with a pullup resistor.
This operational amplifier offers the high slew rate, wide bandwidth, and high input impedance commonly
associated with JFET-input amplifiers, making the TLE2662 operational amplifier section suited for amplifying
fast signals without loading the signal source. When not sourcing or sinking current into a load, the amplifier
consumes only microamperes of supply current, thereby reducing the drain on and extending the life of the
power supply.
The TLE2662 features a shutdown pin (FB/SD), which can be used to disable the switched capacitor section.
When disabled, the voltage converter block draws less than 150 µA from the power supply. This feature,
combined with the operational amplifier’s low quiescent current, makes the TLE2662 a real power saver in the
standby mode.
The switched-capacitor building block also provides an on-board regulator; with the addition of an external
divider, awell-regulatedoutputvoltageiseasilyobtained. Additionalfilteringcanbeaddedtominimizeswitching
noise. The internal oscillator runs at a nominal frequency of 25 kHz. This can be synchronized to an external
clock signal or can be varied using an external capacitor. A 2.5-V reference is brought out to SCREF for use
with the on-board regulator or external circuitry.
TheTLE2662ischaracterizedforoperationovertheindustrialtemperaturerangeof –40°Cto85°C. Thisdevice
is available in a 16-pin wide-body surface-mount package.
AVAILABLE OPTION
PACKAGE
T
A
SMALL OUTLINE
(DW)
–40°C to 85°C
TLE2662IDW
The DW package is available taped and reeled. Add
the suffix R to the device type (i.e., TLE2662IDWR).
Copyright 1994, 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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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