20

TEL-97-D003

99-06-15

PRELIMINARY SPECIFICATION (V1.5)

FREQUENCY SYNTHESIZER

KB8821/22/23

PIN DESCRIPTION(24-QFN)

Pin No

( 20-

TSSOP)

Pin No

(24QFN)

Symbol

I / O

Description

1

24

-

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

the ground plane.

-

1

-

N/C

No connection.

2

2

Vp1

-

Power supply voltage input for RF charge pump(

3

3

CPoRF

O

Internal RF charge pump output for connection to an external loop

filter whose filtered output drives an external VCO.

4

4

GND

-

Ground for RF digital blocks.

5

5

finRF

I

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

6

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

7

GND

-

Ground for RF analog blocks.

8

8

OSCin

I

Reference counter input. TCXO is connected via a coupling

capacitor.

-

9

-

N/C

No connection.

9

10

GND

-

Ground for IF digital blocks.

10

11

O

Multiplexed output of the RF/IF programmable counters, the

reference counters, the lock detect signals and the shift registers.

Table)

11

12

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.

-

13

-

N/C

No connection.

12

14

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

15

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

16

GND

-

Ground for IF analog blocks.

15

17

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

18

finIF

I

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

17

19

GND

-

Ground for IF digital blocks.

18

20

CPoIF

O

Internal IF charge pump output for connection to an external loop

filter whose filtered output drives an external VCO.

-

21

-

N/C

No connection.

19

22

Vp2

-

Power supply voltage input for IF charge pump(