la1867nm Sanyo Semiconductor Corporation, la1867nm Datasheet - Page 10

• Manufacturer Part Number: la1867nm
• Description: Car Radio Single-chip Tuner System
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
Pin
24
25
26
27
29
30
19
AFC
QD OUT
QD IN
V
SD pin
SD sensitivity adjustment
pin
IF counter buffer
Seek/stop switch
REF
Function
Equivalent internal circuit
LA1867NM
Unit (resistance:Ω, capacitance:F)
• R
• Null voltage
The SD output for the pin 30 SD.
R determines the SD sensitivity.
Pin 23 is coupled to the muting drive output.
SD operates when the switch is off.
This pin is used for both the IF counter
buffer (AC output) and the seek/stop switch
(DC input).
It is not coupled to the SD output.
The IF buffer is turned on and off by the pin
19 DC bias level.
Pin 19: high
muting bandwidth.
Increasing R
Decreasing R
When tuned, the voltage between pins 24
and 27 will be 0 V.
V
The band muting is turned on when
| V
1
24
24
is the resistor that determines the band
– V
– V
27
27
= 0 V
| ≥ 0.7 V.
1
1
buffer on, low
reduces the bandwidth.
increases the bandwidth.
Note
No. 4619-10/32
buffer off.