參數(shù)資料
型號(hào): TSH82IYDT
廠商: STMICROELECTRONICS
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: LEAD FREE, PLASTIC, SOP-8
文件頁(yè)數(shù): 10/24頁(yè)
文件大?。?/td> 560K
代理商: TSH82IYDT
Precautions on asymmetrical supply operation
TSH80-TSH81-TSH82
18/24
4
Precautions on asymmetrical supply operation
The TSH8x can be used either with 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, in order to reject any noise present on the supply rail.
As the bias current is 15A, you should use a high resistance R1 (approximately 10k
Ω) to
avoid introducing an offset mismatch at the amplifier inputs.
Figure 33.
Asymmetrical supply schematic diagram
C1, C2, C3 are bypass capacitors intended to filter perturbation from VCC. The following
capacitor values are appropriate:
C1=100nF and C2=C3=100F
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=10kΩ, Rout=RL=150Ω, and Cin=2F, Cout=220F the cutoff frequency
obtained is lower than 10Hz.
Figure 34.
Use of the TSH8x in gain = -1 configuration
IN
R1
Vcc+
OUT
R2
R3
C1
C3
C2
Cin
Cout
+
-
Cf
R5
R4
RL
IN
R1
Vcc+
OUT
R2
R3
C1
C3
C2
Cin
Cout
+
-
1k
Cf
1k
RL
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