參數(shù)資料
型號(hào): TSH512CFT
廠(chǎng)商: STMICROELECTRONICS
元件分類(lèi): 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝: 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁(yè)數(shù): 11/31頁(yè)
文件大?。?/td> 1350K
代理商: TSH512CFT
TSH512
General description
Doc ID 8120 Rev 7
19/31
Figure 26.
LNA schematics
The LNA gain is given by:
GLNA (dB) = 20.Log(1+RLNA2/RLNA1)
The high-pass cut-off frequency is:
fHPF = 1/(2.π.RLNA1.CLNA1)
The lowpass filter cut-off frequency is:
fLPF = 1/(2.π.RLNA2.CLNA2)
If you connect an external circuit to the LNA output, the impedance of this external circuit
should be higher than 10 m
Ωand the capacitance lower than 50 pF in order to keep a good
stability.
Note:
The capacitor C must be connected directly to input pin 12.
5.2
Electret condenser microphone source
When an electret condenser microphone (ECM) is used, a high gain LNA is recommended,
but low frequencies have to be attenuated. The ECM must be biased with a stable and clean
reference voltage. The TSH512 provides the LNA and the MIC-BIAS sections to perform this
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