Cobra MR HH475 FLT BT/EU, Service Manual

Page: 55 / 67

Block Diagram
PIN Description
Pin No. Symbol Function Description I / O
1 Fin1 RF input, channel 1. I
2, 15 Vcc
Power supply.
Two pins are connected each other.
-
3
Charge pum p output, cha nnel 1. Charg e pu mp current is selecte d b y th e inp ut
serial data.
O
4, 13 GND Ground. Two pins are connected. -
5 LD Output of lock detection. It is the open drain output. O
6 Clock input.
7 DATA Serial data input.
8 EN Input of enable signal.
Serial data interface. I
9 BO Output of buffer amplifier. The local signal passes through the buffer amplifier. O
10 Oscillator output. O
11
PLL reference input.
Typically connected to a TCXO output.
I
12
Switchover terminal to contr ol time cons tant of loop filter . It is the open drain
output. When switched of
f, it
s normal output.
O
14 CP2 Charge pump output, channel 2. O
16 Fin2 RF input, channel 2. I
OSCO
OSCI
SW
CK
CP1
U GP214D 6-
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