TLC2810Z Datasheet, PDF (19/23 Pages) Texas Instruments – LinCMOSE PRECISION DUAL OPERATIONAL AMPLIFIERS

TLC2810Z, TLC2810Y
LinCMOS™ PRECISION
DUAL OPERATIONAL AMPLIFIERS
SLOS120A – AUGUST 1993 – REVISED AUGUST 1994
APPLICATION INFORMATION
single-supply operation
VDD
While the TLC2810Z performs well using
dual-power supplies (also called balanced or split
R2
supplies), the design is optimized for single-
supply operation. This includes an input common-
mode voltage range that encompasses ground as
well as an output voltage range that pulls down to
ground. The supply voltage range extends down
to 4 V, thus allowing operation with supply levels
commonly available for TTL and CMOS.
Many single-supply applications require that a
R1
VI
TLE2426
–
+
VO
+ ( ^* ) ) VO
VDD VI _R2 VDD
2
R1 2
voltage be applied to one input to establish a
reference level that is above ground. This virtual
ground can be generated using two large
resistors, but a preferred technique is to use a
Figure 31. Inverting Amplifier With Voltage
Reference
virtual ground generator such as the TLE2426 (see Figure 31). The TLE2426 supplies an accurate voltage equal
to V_DD /2, while consuming very little power and is suitable for supply voltages of greater than 4 V.
The TLC2810Z works well in conjunction with digital logic. However, when powering both linear devices and
digital logic from the same power supply, the following precautions are recommended:
1. Power the linear devices from separate bypassed supply lines (see Figure 32). Otherwise, the linear
device supply rails can fluctuate due to voltage drops caused by high switching currents in the digital logic.
2. Use proper bypass techniques to reduce the probability of noise-induced errors. Single capacitive
decoupling is often adequate. However, RC decoupling may be necessary in high-frequency applications.
Output
–
Logic
Logic
Logic
+
(a) COMMON SUPPLY RAILS
Power
Supply
Output
–
Logic
Logic
Logic
+
Power
Supply
(b) SEPARATE BYPASSED SUPPLY RAILS (preferred)
Figure 32. Common Versus Separate Supply Rails
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