TLC271_01 Datasheet, PDF (56/82 Pages) Texas Instruments – LinCMOSE PROGRAMMABLE LOW-POWER OPERATIONAL AMPLIFIERS

TLC271, TLC271A, TLC271B
LinCMOS PROGRAMMABLE LOW-POWER
OPERATIONAL AMPLIFIERS
SLOS090D – NOVEMBER 1987 – REVISED MARCH 2001
PARAMETER MEASUREMENT INFORMATION
full-power response
Full-power response, the frequency above which the amplifier slew rate limits the output voltage swing, is often
specified two ways: full-linear response and full-peak response. The full-linear response is generally
measuredby monitoring the distortion level of the output while increasing the frequency of a sinusoidal input
signal until the maximum frequency is found above which the output contains significant distortion. The full-peak
response is defined as the maximum output frequency, without regard to distortion, above which full
peak-to-peak output swing cannot be maintained.
Because there is no industry-wide accepted value for significant distortion, the full-peak response is specified
in this data sheet and is measured using the circuit of Figure 98. The initial setup involves the use of a sinusoidal
input to determine the maximum peak-to-peak output of the device (the amplitude of the sinusoidal wave is
increased until clipping occurs). The sinusoidal wave is then replaced with a square wave of the same
amplitude. The frequency is then increased until the maximum peak-to-peak output can no longer be maintained
(Figure 102). A square wave is used to allow a more accurate determination of the point at which the maximum
peak-to-peak output is reached.
(a) f = 100 Hz
(b) BOM > f > 100 Hz
(c) f = BOM
Figure 102. Full-Power-Response Output Signal
(d) f > BOM
test time
Inadequate test time is a frequent problem, especially when testing CMOS devices in a high-volume,
short-test-time environment. Internal capacitances are inherently higher in CMOS than in bipolar and BiFET
devices, and require longer test times than their bipolar and BiFET counterparts. The problem becomes more
pronounced with reduced supply levels and lower temperatures.
APPLICATION INFORMATION
single-supply operation
While the TLC271 performs well using dual power
supplies (also called balanced or split 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 3 V (C-suffix types), thus allowing operation
with supply levels commonly available for TTL and
HCMOS; however, for maximum dynamic range,
16-V single-supply operation is recommended.
VDD
R4
R1
VI
R2
VO
Vref
R3
C
0.01 µF
+ ₎ Vref
VDD
R3
R1 R3
+ * ) VO
(Vref
VI)
R4
R2
Vref
Figure 103. Inverting Amplifier With Voltage
Reference
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