TSH512 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH512' PDF : 32 Pages View PDF
TSH512
Figure 26. LNA schematics
General description
Note:
5.2
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 mΩand the capacitance lower than 50 pF in order to keep a good
stability.
The capacitor C must be connected directly to input pin 12.
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
function (see Section 5.3. MIC-BIAS section: microphone bias voltage).
Doc ID 8120 Rev 7
19/31
Share Link: 
