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TLC251 Datasheet(PDF) 17 Page - Texas Instruments

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Part No. TLC251
Description  LinCMOS PROGRAMMABLE LOW-POWER OPERATIONAL AMPLIFIERS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC251 Datasheet(HTML) 17 Page - Texas Instruments

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TLC251, TLC251A, TLC251B, TLC251Y
LinCMOS
 PROGRAMMABLE
LOW-POWER OPERATIONAL AMPLIFIERS
SLOS001F – JULY 1983 – REVISED MARCH 2001
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
using BIAS SELECT
The TLC251 has a terminal called BIAS SELECT that allows the selection of one of three IDD conditions (10,
150, and 1000
µA typical). This allows the user to trade-off power and ac performance. As shown in the typical
supply current (IDD) versus supply voltage (VDD) curves (Figure 4), the IDD varies only slightly from 4 V to 16 V.
Below 4 V, the IDD varies more significantly. Note that the IDD values in the medium- and low-bias modes at
VDD = 1.4 V are typically 2 µA, and in the high mode are typically 12 µA. The following table shows the
recommended BIAS SELECT connections at VDD = 10 V.
BIAS MODE
AC PERFORMANCE
BIAS SELECT
CONNECTION†
TYPICAL IDD‡
Low
Medium
High
Low
Medium
High
VDD
0.8 V to 9.2 V
Ground pin
10
µA
150
µA
1000
µA
† Bias selection may also be controlled by external circuitry to conserve power, etc.
For information regarding BIAS SELECT, see Figure 3 in the typical
characteristics curves.
‡ For IDD characteristics at voltages other than 10 V, see Figure 4 in the typical
characteristics curves.
output stage considerations
The amplifier’s output stage consists of a source-follower-connected pullup transistor and an open-drain
pulldown transistor. The high-level output voltage (VOH) is virtually independent of the IDD selection and
increases with higher values of VDD and reduced output loading. The low-level output voltage (VOL) decreases
with reduced output current and higher input common-mode voltage. With no load, VOL is essentially equal to
the potential of VDD–/GND.
input offset nulling
The TLC251C series offers external offset null control. Nulling may be achieved by adjusting a 25-k
potentiometer connected between the offset null terminals with the wiper connected to the device VDD–/GND
pin as shown in Figure 2. The amount of nulling range varies with the bias selection. At an IDD setting of 1000 µA
(high bias), the nulling range allows the maximum offset specified to be trimmed to zero. In low or medium bias
or when the amplifier is used below 4 V, total nulling may not be possible for all units.
supply configurations
Even though the TLC251C series is characterized for single-supply operation, it can be used effectively in a
split-supply configuration when the input common-mode voltage (VICR), output swing (VOL and VOH), and
supply voltage limits are not exceeded.
circuit layout precautions
The user is cautioned that whenever extremely high circuit impedances are used, care must be exercised in
layout, construction, board cleanliness, and supply filtering to avoid hum and noise pickup, as well as excessive
dc leakages.


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