PRELIMINARY SPECIFICATION (V1.5)

FREQUENCY SYNTHESIZER

KB8821/22/23

4

99-06-15

PIN DESCRIPTION

Pin No

Symbol

I / O

Description

1

-

order to reject supply noise, bypass capacitors must be placed as close as

possible to this pin and be connected directly to the ground plane.

2

Vp1

-

Power supply voltage input for RF charge pump(

3

CPoRF

O

Internal RF charge pump output for connection to an external loop filter whose

filtered output drives an external VCO.

4

GND

-

Ground for RF digital blocks.

5

finRF

I

RF prescaler input. The signal comes from the external VCO.

6

finRF

I

The complementary input of the RF prescaler. A bypass capacitor must be

placed as close as possible to this pin and be connected directly to the ground

plane. The bypass capacitor is optional with some loss of sensitivity.

7

GND

-

Ground for RF analog blocks.

8

OSCin

I

Reference counter input. TCXO is connected via a coupling capacitor.

9

GND

-

Ground for IF digital blocks.

10

O

Multiplexed output of the RF/IF programmable counters, the reference

counters, the lock detect signals and the shift registers. The output level is

11

CLOCK

I

CMOS clock input. Serial data for the various counters is transfered into the

22-bit shift register on the rising edge of the clock signal.

12

DATA

I

Binary serial data input. The MSB of CMOS input data is entered first. The

control bits are on the last two bits. CMOS input.

13

LE

I

Load enable CMOS input. When LE becomes high, the data in the shift

register is loaded into one of the four latches(by the control bits).

14

GND

-

Ground for IF analog blocks.

15

finIF

I

The complementary input of the IF prescaler. A bypass capacitor must be

placed as close as possible to this pin and be connected directly to the ground

plane. The bypass capacitor is optional with some loss of sensitivity.

16

finIF

I

IF prescaler input. The signal comes from the external VCO.

17

GND

-

Ground for IF digital blocks.

18

CPoIF

O

Internal IF charge pump output for connection to an external loop filter whose

filtered output drives an external VCO.

19

Vp2

-

Power supply voltage input for IF charge pump(

20

-

order to reject supply noise, bypass capacitors must be placed as close as

possible to this pin and be connected directly to the ground plane.