ADF4116/ADF4117/ADF4118

–5–

REV. 0

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Function

Fast Lock Switch Output. This can be used to switch an external resistor to change the loop filter band-

width. This will speed up locking of the PLL.

2

CP

Charge Pump Output. When enabled, this provides the

±I

the external VCO.

3

CPGND

Charge Pump Ground. This is the ground return path for the charge pump.

4

AGND

Analog Ground. This is the ground return path for the prescaler.

Complementary Input to the RF Prescaler. This point should be decoupled to the ground plane with a

small bypass capacitor, typically 100 pF. See Figure 22.

Input to the RF Prescaler. This small signal input is normally ac-coupled from the VCO.

Analog Power Supply. This may range from 2.7 V to 5.5 V. Decoupling capacitors to the analog ground

8

resistance of 100 k

Ω. See Figure 21. The oscillator input can be driven from a TTL or CMOS crystal

oscillator or it can be ac-coupled.

9

DGND

Digital Ground.

10

CE

Chip Enable. A logic low on this pin powers down the device and puts the charge pump output into three-

state mode. Taking the pin high will power up the device depending on the status of the power-down bit F2.

11

CLK

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

the 21-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

MUXOUT

This multiplexer output allows either the Lock Detect, the scaled RF or the scaled Reference Frequency

to be accessed externally.

15

Digital Power Supply. This may range from 2.7 V to 5.5 V. Decoupling capacitors to the digital ground

16

it can be set to 5 V and used to drive a VCO with a tuning range of up to 6 V.

PIN CONFIGURATIONS

TSSOP

TOP VIEW

(Not to Scale)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

ADF4116

ADF4117

ADF4118

CP

CPGND

MUXOUT

AGND

LE

DATA

CLK

CE

DGND

Chip Scale Package

TOP VIEW

(Not to Scale)

CPGND

AGND

AGND

MUXOUT

LE

DATA

CLK

CE

ADF4116

ADF4117

ADF4118

1

2

3

4

5

15

14

13

12

11