ADF4107

Rev. 0 | Page 6 of 20

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

CP

CPGND

AGND

MUXOUT

LE

DATA

CLK

CE

DGND

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

ADF4107

TOP VIEW

(Not to Scale)

TSSOP

Figure 3. ADF4107 TSSOP (Top View)

15 MUXOUT

14 LE

13 DATA

12 CLK

CPGND 1

AGND 2

AGND 3

11 CE

4

5

PIN 1

INDICATOR

TOP VIEW

ADF4107

CSP

(Chip Scale Package)

Figure 4. ADF4107 Chip Scale Package

Table 4. Pin Functional Descriptions

Mnemonic

Function

Connecting a resistor between this pin and CPGND sets the maximum charge pump output current. The nominal voltage

SET

MAX

CP

R

I

5

.

25

=

CP

CPGND

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

AGND

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

Complementary Input to the RF Prescaler. This point must be decoupled to the ground plane with a small bypass capacitor,

typically 100 pF. See Figure 18.

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

Analog Power Supply. This voltage may range from 2.7 V to 3.3 V. Decoupling capacitors to the analog ground plane should

Figure 17. This input can be driven from a TTL or CMOS crystal oscillator or it can be ac-coupled.

DGND

Digital Ground.

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.

CLK

Serial Clock Input. This serial clock is used to clock in the serial data to the registers. The data is latched into the 24-bit shift

register on the CLK rising edge. This input is a high impedance CMOS input.

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.

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.

MUXOUT

This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference frequency to be accessed

externally.

Digital Power Supply. This may range from 2.7 V to 3.3 V. Decoupling capacitors to the digital ground plane should be placed

V and used to drive a VCO with a tuning range of up to 5 V.