Silan
Semiconductors
PLL FOR DTS
DESCRIPTION
The SC9257 is phase-locked loop (PLL) LSIs for digital tuning
systems (DTS) with built in 2 modulus prescalers.
All functions ate controlled through 3 serial bus lines. These LSIs
are used to configure high-performance digital tuning system.
SC9257
DIP-20-300-2.54
FEATURES
* Optimal for configuring digital tuning systems in high-fi tuners
and car stereos.
* built-in prescalers. Operate at input frequency ranging from
30~150 MHz during FM
IN
input (with 2 modulus prescaler) and
at 0.5~40MHz during AM
IN
input (with 2 modulus prescaler or
direct dividing).
* 16 bit programmable counter, dual parallel output phase
comparator, crystal oscillator and reference counter.
* 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be
used.
* 15 possible reference frequencies. ( When using 4.5MHz crystal)
* Built-in 20 bit general-purpose counter for such uses as
measuring intermediate frequencies (IF
IN1
and IF
IN2
) and low-
frequency pilot signal cycles (SC
IN
).
* High-precision (±0.55~±7.15µs) PLL phase error detection.
* Numerous general-purpose I/O pins for such uses as peripheral
circuit control.
* 4 N-channel open-drain output ports
(OFF withstanding voltage:12V) for such
uses as control signal output.
* Standby mode function (turns off FM, AM
and
IF
amps)
to
save
current
consumption.
* All functions controlled through 3 serial
bus lines.
* CMOS structure with operating power
supply range of VDD=5.0±0.5V.
SOP-20-300-1.27
PIN CONFIGURATION
XT
XT
PERIOD
CLOCK
DATA
OT-1
OT-2
OT-3
OT-4
1
2
3
20 DO2
19 DO1
18 I/O-7/SC
IN
SC9257
4
5
6
7
8
9
17 I/O - 8/IF
IN1
16 I/O - 9/IF
IN2
15 GND
14 FM
IN
13 AM
IN
12 V
DD
11 I/O-6
I/O - 5/CLK 10
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2001.10.18
1
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
