Kenwood RXD-F4 Service Manual page 24

RXD-F3/F4/F41/F42
CIRCUIT DESCRIPTION
6. KEY CONTROL IC : 65840SP (X11 : IC1)
6.1 Block diagram
6.2Pin connection
ees t y fa]
MIXOUT MIXIN XOUT vcC GND REF TEST3 TEST2 TEST1 HPFOUT HPFIN ! ce
3) — ( e @-@—__@—_@ (3) —Gs)
ma =
LOCK rea
{25 |
5 P24 |
1 Lo poo
6 23
ca [22]
| D/A2 D/A 1 — |
LPF2OUT ~—-LPF2IN | DAZINTOUT| DA1CONT | DA1INTIN | CLOCK | ADCONT | ADINTIN LPFIIN
DA2CONT DAZ INTIN DAINTOUT
6.3 Pin description
Q- On ©
qQ
||
DATA STROBE ADINTOUT LPF1OUT
| ic [3]
a
|
—
a
DESCRIPTION
Pais
08
Decide fitness time constant of ADM system A/D convert.
~ Decide fitness time constant of ADM system D/A1 convert.
"Decide fitness time constant of ADM system D/A2 convert. | —
_LINORMAL mode H: TEST mode =
Connect 16MHz ceramic filter.
Serial bus DATA input
Serial bus CLOCK input
4
—|- ibe ae
~ STROBE
_ TEST2 |
N.C. (Open) —
4.
Serial bus STROBE input
- TESTS | :
"N.C.(Open)
REF
1/2Vcc output,Connect filter C.
~ GND ~ GND
"VCC
Power supply
_MIXOUT | O
"MIXIN
Mix key control low signal and through high signal.
~ LPF2OUT
LPF2IN
Post filter after converted D/A of the key control.
~HPFOUT |
HPFIN
| |
| i
L.P.F. of through high signal.
__LPF1 OUT
LPF1IN
-|Oo|-|'0 -|o/-
Pre filter before converted A/D of the key control.
ADINTIN
~ ADINTOUT
A/D converted integrator with outside C.
DAtINTIN
DA1INTOUT
D/A1 converted integrator with outside C.
DA2INTIN
DA2INTOUT
6/~|6}~| 0] —|
D/A2 converted integrator with outside C.