la72670bm Sanyo Semiconductor Corporation, la72670bm Datasheet - Page 10

• Manufacturer Part Number: la72670bm
• Description: Us Multiplex Modulation For Vcr Hifi Sound Signal Processor
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
No.
Pin
24
27
26
28
29
30
REC CURRENT AMP
CURRENT AMP
HiFi/NORMAL
HEAD AMP input
terminal
HEAD AMP input
terminal
output terminal
ADJUST terminal
SAP detection terminal
detection terminal
Pin Function Name
(Hch)
(Lch)
DC
PB; 2.0V
REC; 4.1V
DC; 4.1V
AC; 2.1Vp-p
DC; 2.4V
AC:1.3Vp-p
DC ;
DC:
Nor; 2.5V or
more
HiFi; 2.2V or
less
(L/R_MIX)
DC voltage
AC level
It becomes HEAD AMP input in PB mode.
Hch is Pin24, and Lch is Pin 27.
And, it becomes supply source of REC
current in REC mode.
CURRENT AMP output in REC mode.
Common input terminal in PB mode.
Terminal for adjusting the recording current.
Filter terminal in the SPA detector circuit.
This terminal is for detecting
demodulation noise and output which has
passed through the primary
HPF(fc=140kHz).
LA72670BM
Function
PB-ON
200Ω
2kΩ
Equivalent circuit
400Ω
PB-ON
REC-ON
Continued on next page.
Pin30
Pin28
REC-
1kΩ
ON
No.A0644-10/20
V CC 5V