參數(shù)資料
型號(hào)： TSH81IPT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： ROHS COMPLIANT, PLASTIC, TSSOP-8
文件頁(yè)數(shù)： 11/27頁(yè)
文件大小： 1229K
代理商： TSH81IPT
TSH80, TSH81, TSH82, TSH84
Precautions on asymmetrical supply operation
Doc ID 9413 Rev 5
19/27
4
Precautions on asymmetrical supply operation
The TSH8x can be used with either a dual or a single supply. If a single supply is used, the
inputs are biased to the mid-supply voltage (+VCC/2). This bias network must be carefully
designed so as to reject any noise present on the supply rail.
As the bias current is 15 A, you should use a high resistance R1 (approximately 10 k
Ω) to
avoid introducing an offset mismatch at the amplifier’s inputs.
Figure 33.
Asymmetrical supply schematic diagram
C1, C2, C3 are bypass capacitors intended to filter perturbations from VCC. The following
capacitor values are appropriate.
C1 = 100 nF and C2 = C3 = 100 F
R2 and R3 are such that the current through them must be superior to 100 times the bias
current. Therefore, you could use the following resistance values.
R2 =R3=4.7k
Ω
Cin and Cout are chosen to filter the DC signal by the low pass filters (R1, Cin) and (Rout,
Cout). With R1 = 10 kΩ, Rout =RL = 150 Ω, and Cin =2F, Cout = 220 F the cutoff
frequency obtained is lower than 10 Hz.
Figure 34.
Use of the TSH8x in a gain = -1 configuration
IN
R1
OUT
R2
R3
C1
C3
+
-
R4
C2
R5
Cf
RL
Cin
Cout
AM00845
Vcc+
IN
R1
OUT
R2
R3
C1
C3
+
-
C2
Cf
RL
Cin
Cout
AM00846
Vcc+
1 k
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