msm6722gs-k Oki Semiconductor, msm6722gs-k Datasheet - Page 11

• Manufacturer Part Number: msm6722gs-k
• Description: Pitch Control Ic For The Speech Signal
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Analog Input Amplifer Circuit
The output V
The allowable FIN input voltage V
Therefore, the amplification factor must be adjusted so that the V
allowable FIN input voltage range. For example, if V
If V
waveform. The load resistance R
Therefore, the feedback resistors R2 and R4 must be 200 kW or more.
When OP amplifier 1 is not used and OP amplifier 2 is used, the MIN pin must be connected to
AGND or AVDD, and the MOUT pin must be open.
Even if amplification is unnecessary, OP amplifier 2 must be always used.
Below is an example of an analog input amplifier circuit when the amplification factor is 1.
LO
exceeds the allowable FIN input voltage range, the output of the LPF will be a clipped
LO
AGND
SG
of OP amplifer 2 is connected to the input FIN of the built-in LPF.
MIN
–
+
OUTA
OP amplifier 1
FIN
Input signal
ranges from 1 V to (V
of the OP amplifier is 200 kW or more.
MOUT
(200kW)
R3
DD
LIN
= 5 V, V
DD
(200kW)
–
+
R4
FIN
– 1) V.
OP amplifier 2
LO
amplitude can be within the
MSM6722
becomes 3 V
LOUT
P–P
MSM6722
max.
11/18