Kenwood TS-2000, Руководство по обслуживанию

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49
TS-2000/X
PLL : LMX2306TMX (TX-RX 2 unit IC401,409~412,414)
PLL : LMX2316TMX (TX-RX 2 unit IC402, TX-RX 3 unit IC5)
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Block diagram
14-bit
R counter
21-bit
Data Register
18-bit
Function
Latch
Phase
Comp.
Lock
Detect
Fast
Lock
FoLD
MUX
18-bit
N counter
Prescaler
OSC
Charge
Pump
OSC
IN
f
IN
CLOCK
LE
DATA
CPo
FLo
FoLD
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Pin description
No. Name I/O Description
1 FLo O FastLock output. For connection of
parallel resistor to the loop filter.
2 CPo O Charge pump output. For connection to a
loop filter for driving the input of an
external VCO.
3 GND – Charge pump ground.
4 GND – Analog ground.
5 f
IN
I RF prescaler complementary input.
A bypass capacitor should be placed as
close as possible to this pin and be
connected directly to the ground plane.
The complementary input can be left
unbypassed, with some degradation in
RF sensitivity.
6 f
IN
I RF prescaler input. Small signal input
from the VCO.
7 Vcc1 – Analog power supply voltage input.
Input may range from 2.3V to 5.5V.
Bypass capacitors should be placed as
close as possible to this pin and be
connected directly to the ground plane.
Vcc1 must equal Vcc2.
8 OSC
IN
I Oscillator input. This input is a CMOS
input with a threshold of approximately
Vcc/2 and an equivalent 100k input
resistance. The oscillator input is driven
from a reference oscillator.
9 GND – Digital ground.
No. Name I/O Description
10 CE I Chip enable. A LOW on CE powers down
the device and will TRI-STATE the charge
pump output. Taking CE HIGH will power
up the device depending on the status of
the power down bit F2.
11 Clock I High impedance CMOS clock input. Data
for the various counters is clocked in on
the rising edge into the 21-bit shift
register.
12 Data I Binary serial data input. Data entered
MSB first. The last two bits are the
control bits. High impedance CMOS input.
13 LE I Load enable CMOS input. When LE goes
high, data stored in the shift registers is
loaded into one of the 3 appropriate
latches (control bit dependent).
14 Fo/LD O Multiplexed output of the RF program-
mable of reference dividers and lock
detect. CMOS output.
15 Vcc2 – Digital power supply voltage input. Input
may range from 2.3V to 5.5V. Bypass
capacitors should be placed as close as
possible to this pin and be connected
directly to the ground plane. Vcc1 must
equal Vcc2.
16 Vp – Power supply for charge pump.
Must be
≥
Vcc.
SEMICONDUCTOR DATA