The TLC4501 and TLC4502 are the highest precision CMOS single supply rail-to-rail operational amplifiers
available today. The input offset voltage is 10 µV typical and 40 µV maximum. This exceptional precision,
combined with a 4.7-MHz bandwidth, 2.5-V/µs slew rate, and 50-mA output drive, is ideal for multiple
applications including: data acquisition systems, measurement equipment, industrial control applications, and
portable digital scales.
D
Slew Rate . . . 2.5 V/µs
D
High Output Drive Capability . . . ±50 mA
D
Calibration Time . . . 300 ms
D
Characterized From –55°C to 125°C
D
Available in Q-Temp Automotive
HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards
These amplifiers feature
self-calibrating
circuitry which digitally trims the input offset voltage to less than 40 µV
within the first 300 ms of operation. The offset is then digitally stored in an integrated successive approximation
register (SAR). Immediately after the data is stored, the calibration circuitry effectively drops out of the signal
path, shuts down, and the device functions as a standard operational amplifier.
Offset Control
D/A
SAR
Oscillator
A/D
1
OUT
4
GND
V
IN+
IN–
DD
3
2
Calibration Circuitry
8
Power-On
Reset
+
–
5 V
Control
Logic
Figure 1. Channel One of the TLC4502
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.
LinEPIC and Self-Cal are trademarks of 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1999, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1
TLC4501, TLC4501A, TLC4502, TLC4502A
0°C to 70°C
40°C to 125°C
40°C to 125°C
55°C to 125°C
FAMILY OF SELF-CALIBRATING (Self-Cal)
PRECISION CMOS RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
SLOS221A – MA Y 1998 – REVISED JULY 1999
description (continued)
Using this technology eliminates the need for noisy and expensive chopper techniques, laser trimming, and
power hungry, split supply bipolar operational amplifiers.
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values, except differential voltages, are with respect to V
2. Differential voltages are at IN+ with respect to IN–. Excessive current flows when an input is brought below V
3. The output may be shorted to either supply. Temperature and/or supply voltages must be limited to ensure that the maximum
dissipation rating is not exceeded.
VDD = 2.5 V
GND = –2.5 V
RL = 1 kΩ to GND
AV = –1
VI = 0
700 800 900 1000
CALIBRATION TIME AT 125°C
0.5
CALIBRATION TIME AT 85°C
0.5
0
–0.5
–1
–1.5
– Output Voltage – V
O
–2
V
–2.5
–3
0 100 200 300 400 500 600
VDD = 2.5 V
GND = –2.5 V
RL = 1 kΩ to GND
AV = –1
VI = 0
700 800 900 1000
t – Time – ms
Figure 33
0
–0.5
–1
–1.5
– Output Voltage – V
O
–2
V
–2.5
–3
VDD = 2.5 V
GND = –2.5 V
RL = 1 kΩ to GND
AV = –1
VI = 0
0 100 200 300 400 500 600
t – Time – ms
Figure 34
700 800 900 1000
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
19
TLC4501, TLC4501A, TLC4502, TLC4502A
FAMILY OF SELF-CALIBRATING (Self-Cal)
PRECISION CMOS RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
SLOS221A – MA Y 1998 – REVISED JULY 1999
APPLICATION INFORMATION
D
The TLC4502 is designed to operate with only a single 5-V power supply , have true differential inputs, and
remain in the linear mode with an input common-mode voltage of 0.
D
The TLC4502 has a standard dual-amplifier pinout, allowing for easy design upgrades.
D
Large differential input voltages can be easily accommodated and, as input differential-voltage protection
diodes are not needed, no large input currents result from large differential input voltage. Protection should
be provided to prevent the input voltages from going negative more than –0.3 V at 25°C. An input clamp
diode with a resistor to the device input terminal can be used for this purpose.
D
For ac applications, where the load is capacitively coupled to the output of the amplifier, a resistor can be
used from the output of the amplifier to ground. This increases the class-A bias current and prevents
crossover distortion. Where the load is directly coupled, for example in dc applications, there is no crossover
distortion.
D
Capacitive loads, which are applied directly to the output of the amplifier, reduce the loop stability margin.
V alues of 500 pF can be accommodated using the worst-case noninverting unity-gain connection. Resistive
isolation should be considered when larger load capacitance must be driven by the amplifier.
The following typical application circuits emphasize operation on only a single power supply. When
complementary power supplies are available, the TLC4502 can be used in all of the standard operational
amplifier circuits. In general, introducing a pseudo-ground (a bias voltage of VI/2 like that generated by the
TLE2426) allows operation above and below this value in a single-supply system. Many application circuits
shown take advantage of the wide common-mode input-voltage range of the TLC4502, which includes ground.
In most cases, input biasing is not required and input voltages that range to ground can easily be
accommodated.
description of calibration procedure
To achieve high dc gain, large bandwidth, high CMRR and PSRR, as well as good output drive capability, the
TLC4502 is built around a 3-stage topology: two gain stages, one rail-to-rail, and a class-AB output stage. A
nested Miller topology is used for frequency compensation.
During the calibration procedure, the operational amplifier is removed from the signal path and both inputs are
tied to GND. Figure 35 shows a block diagram of the amplifier during cabilbration mode.
The class AB output stage features rail-to-rail voltage swing and incorporates additional switches to put the
output node into a high-impedance mode during the calibration cycle. Small-replica output transistors (matched
to the main output transistors) provide the amplifier output signal for the calibration circuit. The TLC4502 also
features built-in output short-circuit protection. The output current flowing through the main output transistors
is continuously being sensed. If the current through either of these transistors exceeds the preset limit (60 mA
– 70 mA) for more than about 1 µs, the output transistors are shut down to approximately their quiescent
operating point for approximately 5 ms. The device is then returned to normal operation. If the short circuit is
still in place, it is detected in less than 1 µs and the device is shut down for another 5 ms.
The offset cancellation uses a current-mode digital-to-analog converter (DAC), whose full-scale current allows
for an adjustment of approximately ±5 mV to the input offset voltage. The digital code producing the cancellation
current is stored in the successive-approximation register (SAR).
During power up, when the offset cancellation procedure is initiated, an on-chip RC oscillator is activated to
provide the timing of the successive-approximation algorithm. T o prevent wide-band noise from interfering with
the calibration procedure, an analog low-pass filter followed by a Schmidt trigger is used in the decision chain
to implement an averaging process. Once the calibration procedure is complete, the RC oscillator is deactivated
to reduce supply current and the associated noise.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
21
TLC4501, TLC4501A, TLC4502, TLC4502A
FAMILY OF SELF-CALIBRATING (Self-Cal)
PRECISION CMOS RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
SLOS221A – MA Y 1998 – REVISED JULY 1999
APPLICATION INFORMATION
The key operational-amplifier parameters CMRR, PSRR, and offset drift were optimized to achieve superior
offset performance. The TLC4502 calibration DAC is implemented by a binary-weighted current array using a
pseudo-R-2R MOSFET ladder architecture, which minimizes the silicon area required for the calibration
circuitry, and thereby reduces the cost of the TLC4502.
Due to the performance (precision, PSRR, CMRR, gain, output drive, and ac performance) of the TLC4502, it
is ideal for applications like:
D
Data acquisition systems
D
Medical equipment
D
Portable digital scales
D
Strain gauges
D
Automotive sensors
D
Digital audio circuits
D
Industrial control applications
It is also ideal in circuits like:
D
A precision buffer for current-to-voltage converters, a/d buffers, or bridge applications
D
High-impedance buffers or preamplifiers
D
Long term integration
D
Sample-and-hold circuits
D
Peak detectors
The TLC4502 self-calibrating operational amplifier is manufactured using Texas instruments LinEPIC process
technology and is available in an 8-pin SOIC (D) Package. The C-suffix devices are characterized for operation
from 0°C to 70°C. The I-suffix devices are characterized for operation from –40°C to 125°C.The M-suffix devices
are characterized for operation from –55°C to 125°C.
Macromodel information provided was derived using Microsim
software used with Microsim
PSpice
. The Boyle macromodel (see Note 4) and subcircuit in Figure 46 are
Parts
Release 8, the model generation
generated using the TLC4501 typical electrical and operating characteristics at TA = 25°C. Using this
information, output simulations of the following key parameters can be generated to a tolerance of 20% (in most
cases):
D
Maximum positive output voltage swing
D
Maximum negative output voltage swing
D
Slew rate
D
Quiescent power dissipation
D
Input bias current
D
Open-loop voltage amplification
NOTE 4: G. R. Boyle, B. M. Cohn, D. O. Pederson, and J. E. Solomon, “Macromodeling of Intergrated Circuit Operational Amplifiers”,
V
V
Journal of Solid-State Circuits,
3
DD+
RP
2
IN –
IN+
1
DP
4
DD–
ISS
SC-9, 353 (1974).
RSS
10
J1J2
11
C1
RD1
CSS
12
RD2
+
VD
–
DC
DE
+
VE
–
53
54
D
Unity-gain frequency
D
Common-mode rejection ratio
D
Phase margin
D
DC output resistance
D
AC output resistance
D
Short-circuit output current limit
EGND
R26
9
+
VB
–
90
HLIM
+
–
GCM
+
DLP
–
+
–
91
C2
GA
DLN
FB
99
RO2
7
+
VLIM
92
–
VLNVLP
+
–
8
RO1
5
IEEE
OUT
.subckt TLC4501 1 2 3 4 5
*
c2 6 7 8.0000E–12
css 10 99 1.0000E–30
dc 5 53 dy
de 54 5 dy
dlp 90 91 dx
dln 92 90 dx
dp 4 3 dx
egnd 99 0 poly(2) (3,0) (4,0) 0 .5 .5
fb 7 99 poly(5) vb vc ve vlp vln 0
TLC4501, TLC4501A, TLC4502, TLC4502A
FAMILY OF SELF-CALIBRATING (Self-Cal)
PRECISION CMOS RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
SLOS221A – MA Y 1998 – REVISED JULY 1999
MECHANICAL INFORMATION
D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PIN SHOWN
14
1
0.069 (1,75) MAX
0.050 (1,27)
A
0.020 (0,51)
0.014 (0,35)
0.010 (0,25)
0.004 (0,10)
8
7
0.010 (0,25)
0.157 (4,00)
0.150 (3,81)
M
0.244 (6,20)
0.228 (5,80)
Seating Plane
0.004 (0,10)
PINS **
DIM
A MAX
A MIN
0.008 (0,20) NOM
Gage Plane
0°–8°
8
0.197
(5,00)
0.189
(4,80)
14
0.344
(8,75)
0.337
(8,55)
0.010 (0,25)
0.044 (1,12)
0.016 (0,40)
4040047/D 10/96
16
0.394
(10,00)
0.386
(9,80)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold plated.
E. Falls within JEDEC MS-004
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
0.045 (1,14)
0.035 (0,89)
0.045 (1,14)
0.035 (0,89)
4040140/D 10/96
29
TLC4501, TLC4501A, TLC4502, TLC4502A
FAMILY OF SELF-CALIBRATING (Self-Cal)
PRECISION CMOS RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS
SLOS221A – MA Y 1998 – REVISED JULY 1999
MECHANICAL INFORMATION
JG (R-GDIP-T8) CERAMIC DUAL-IN-LINE PACKAGE
0.400 (10,20)
0.355 (9,00)
0.063 (1,60)
0.015 (0,38)
0.100 (2,54)
8
1
5
4
0.065 (1,65)
0.045 (1,14)
0.020 (0,51) MIN
0.280 (7,11)
0.245 (6,22)
0.200 (5,08) MAX
0.130 (3,30) MIN
0.023 (0,58)
0.015 (0,38)
0.310 (7,87)
0.290 (7,37)
Seating Plane
0°–15°
0.014 (0,36)
0.008 (0,20)
NOTES: A. All linear dimensions are in inches (millimeters).
30
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification only on press ceramic glass frit seal only.
E. Falls within MIL-STD-1835 GDIP1-T8
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification only.
E. Falls within MIL STD 1835 GDFP1-F10 and JEDEC MO-092AA
0.300 (7,62)
1.000 (25,40)
0.750 (19,05)
10
0.350 (8,89)0.350 (8,89)
0.250 (6,35)
0.019 (0,48)
0.015 (0,38)
0.050 (1,27)
6
0.025 (0,64)
0.005 (0,13)
4040179/B 03/95
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
31
IMPORTANT NOTICE
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICA TIONS USING SEMICONDUCT OR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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