TLE2301_15 Datasheet, PDF (15/23 Pages) Texas Instruments – EXCALIBUR 3-STATE-OUTPUT WIDE-BANDWIDTH POWER OPERATIONAL AMPLIFIER

TLE2301
EXCALIBUR 3-STATE-OUTPUT WIDE-BANDWIDTH
POWER OPERATIONAL AMPLIFIER
SLOS131 – DECEMBER 1993
APPLICATION INFORMATION
3-state facility (continued)
The TLE2301 incorporates an output 3-state facility, removing the need for additional circuitry to achieve this
function. In addition, the TLE2301 has a low standby current in the 3-state mode, making it ideal for applications
where low power consumption is also essential.
circuit configuration
The design methodology is to minimize power dissipation in the TLE2301 by maximizing the use of the available
output voltage swing of the amplifier. The amplifier’s output can swing to within 2 V of the supply rail before
saturation begins. With a chosen supply of ± 5 V, the maximum peak-to-peak voltage swing is 6 V. To ensure
that the amplifier’s output is not likely to clip under heavy loads, the maximum output voltage swing has been
reduced by 0.5 V, giving a usable peak-to-peak output voltage swing of 5.5 V.
It is assumed that the input signal to the transmitter stage has a peak-to-peak amplitude of 2.8 V (1 Vrms) as
might be expected if the transmission signal is digitally synthesized by circuitry operating solely from the 5-V
supply. The gain of the amplifier stage is appropriately set to:
+ Gain
peak-to-peak output voltage swing
peak-to-peak input voltage
+ 5.5 V
2.8 V
+ 1.96
An inverting amplifier configuration is chosen for this example, as the input signal source is assumed to have
a relatively low impedance in relation to the gain-setting resistors.
CI
100 nF
VI
RI
2.4 kΩ
TRS1
(3-state control)
CF1 CF2
15 pF 39 pF
RF
4.7 kΩ
16
11
–
1
3
IC1
14
+
76
2
9
5
4
RS
3.3 Ω
D1
1N4001
CD1
220 µF ₊
+ _CD2
220 µF
CD3
100 nF
0V
D2
1N4001
CC
470 nF
5V
–5 V
CD4
100 nF
L1
P2820
Mains
Supply
Figure 24. Full-Circuit Diagram for Utility Band
A noninverting amplifier configuration could be used when the input signal needs to be terminated with high
impedance, but the user should take care that the amplitude of the input signal does not exceed the
common-mode input range (– 4 V < V_ICM < 1.8 V at V_CC = ± 5 V) for low-gain implementations.
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