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ADRF6701

Data Sheet

Rev. 0 | Page 8 of 36

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

PIN 1

INDICATOR

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

2. THE EXPOSED PADDLE SHOULD BE SOLDERED TO A

LOW IMPEDANCE GROUND PLANE.

VCC1

DECL1

GND

RSET

REFIN

GND

MUXOUT

DECL2

VCC2

23 GND

24 NC

25 GND

26 RFOUT

27 VCC5

28 GND

29 VCC6

30 GND

22 VCC4

21 GND

TOP VIEW

(Not to Scale)

ADRF6701

Figure 3. Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 10, 17, 22, 27, 29, 34

VCC1, VCC2, VCC3,

VCC4, VCC5, VCC6,

VCC7

Power Supply Pins. The power supply voltage range is 4.75 V to 5.25 V. Drive all of

these pins from the same power supply voltage. Decouple each pin with 100 pF and

0.1 μF capacitors located close to the pin.

DECL1

Decoupling Node for Internal 3.3 V LDO. Decouple this pin with 100 pF and 0.1 μF

capacitors located close to the pin.

Charge Pump Output Pin. Connect VTUNE to this pin through the loop filter. If

an external VCO is being used, connect the output of the loop filter to the VCO’s

voltage control pin. The PLL control loop should then be closed by routing the VCO’s

frequency output back into the ADRF6701 through the LON and LOP pins.

4, 7, 11, 15, 20, 21, 23,

25, 28, 30, 31, 35

GND

Ground. Connect these pins to a low impedance ground plane.

Do not connect to this pin.

RSET

Charge Pump Current. The nominal charge pump current can be set to 250 μA, 500 μA,

750 μA, or 1000 μA using DB10 and DB11 of Register 4 and by setting DB18 to 0 (CP

reference source).

In this mode, no external RSET is required. If DB18 is set to 1, the four nominal charge

pump currents (INOMINAL) can be externally tweaked according to the following

equation:

−

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

217

NOMINAL

SET

where ICP is the base charge pump current in microamps. For further details on the

charge pump current, see the Register 4—PLL Charge Pump, PFD, and Reference Path

Control section.

REFIN

Reference Input. The nominal input level is 1 V p-p. Input range is 12 MHz to 160 MHz.

This pin has high input impedance and should be ac-coupled. If REFIN is being driven

by laboratory test equipment, the pin should be externally terminated with a 50 Ω

resistor (place the ac-coupling capacitor between the pin and the resistor). When

driven from an 50 Ω RF signal generator, the recommended input level is 4 dBm.

MUXOUT

Multiplexer Output. This output allows a digital lock detect signal, a voltage

proportional to absolute temperature (VPTAT), or a buffered, frequency-scaled

reference signal to be accessed externally. The output is selected by programming

DB21 to DB23 in Register 4.

DECL2

Decoupling Node for 2.5 V LDO. Connect 100 pF, 0.1 μF, and 10 μF capacitors between this

pin and ground.

DATA

Serial Data Input. The serial data input is loaded MSB first with the three LSBs being

the control bits.

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