REV. 0

ADF4206/ADF4207/ADF4208

–5–

PIN FUNCTION DESCRIPTIONS

Mnemonic

Pin

ADF4206/

No.

ADF4207

ADF4208

Function

Positive Power Supply for the RF1 Section. A 0.1

µF capacitor should be connected between

Output from the RF1 Charge Pump. This is normally connected to a loop filter which, in

turn, drives the input to an external VCO.

4

Ground Pin for the RF1 Digital Circuitry.

5

Input to the RF1 Prescaler. This low-level input signal is normally taken from the RF1 VCO.

6

Complementary Input to the RF1 Prescaler of the ADF4208. This point should be decoupled to

the ground plane with a small bypass capacitor.

Ground Pin for the RF1 Analog Circuitry.

8

MUXOUT

logic gate.

9

CLK

Oscillator Output.

10

DATA

MUXOUT

This multiplexer output allows either the IF/RF lock detect, the scaled RF, or the scaled

Reference Frequency to be accessed externally. See Table V.

11

LE

CLK

Serial Clock Input. This serial clock is used to clock in the serial data to the registers. The

data is latched into the 22-bit shift register on the CLK rising edge. This input is a high

impedance CMOS input.

12

DATA

Serial Data Input. The serial data is loaded MSB first with the two LSBs being the control

bits. This input is a high impedance CMOS input.

13

LE

Load Enable, CMOS Input. When LE goes high, the data stored in the shift registers is

loaded into one of the four latches, the latch being selected using the control bits.

14

Ground Pin for the RF2 Analog Circuitry.

15

Complementary Input to the RF2 Prescaler. This point should be decoupled to the ground

plane with a small bypass capacitor.

16

Input to the RF2 Prescaler. This low-level input signal is normally ac-coupled to the

external VCO.

17

Ground Pin for the RF2, Digital, Interface, and Control Circuitry.

18

Output from the RF2 Charge Pump. This is normally connected to a loop filter that drives

the input to an external VCO.

19

20

Positive Power Supply for the RF2, Interface, and Oscillator Sections. A 0.1

µF capacitor

PIN CONFIGURATIONS

TSSOP

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

MUXOUT

LE

DATA

CLK

ADF4206/

ADF4207

TSSOP

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

ADF4208

MUXOUT

LE

DATA

CLK