ADF4401ABCEZ datasheet(8/39 Pages) AD

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ADF4401A

Data Sheet

Rev. 0 | Page 8 of 39

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

GND

TEST1

MUXOUT

GND

REFP

REFN

GND

VCC_PLL

CPOUT

GND 10

VCC_CAL 11

VTUNE 12

DCL_BIAS 13

VCC_VCO 14

VCC_VCO 15

GND 16

GND 17

GND 18

GND 19

GND 20

GND

LO_IN

GND

X2_EN

VCC_MIX

GND

VCC_RF

GND

PIN 1

IDENTIFIER

NOTES

1. THE LAND GRID ARRAY (LGA) HAS AN EXPOSED PAD THAT MUST BE SOLDERED TO A

METAL PLATE ON THE PCB FOR MECHANICAL REASONS AND TO GND.

TOP VIEW

(Not to Scale)

ADF4401A

Figure 6. Pin Configuration, Top View

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 4, 7, 10, 16 to 25, 28, 30 to 33, 36

to 48, 50, 51, 55 to 58, 60, 61, 63,

64, 65, 67, 69, 73, 80

GND

Ground. Tie all ground pins together.

TEST1

Internal Test Pin. Tie to GND.

MUXOUT

Multiplexer Output. The MUXOUT pin allows the digital lock detect for the calibration

PLL and scaled RF to be externally accessible. The MUXOUT pin can be programmed to

output the register settings in 4-wire SPI mode.

REFP

Reference Input. The signal at REFP is used as a reference for the calibration PLL.

REFN

Complementary Reference Input. If unused, ac couple the REFN pin to GND.

VCC_PLL

Analog Power Supply. The VCC_PLL pin ranges from 3.15 V to 3.45 V.

CPOUT

Charge Pump Output. When enabled, this output provides ±ICP to the external loop

filter. The output of the loop filter is connected to VTUNE to drive the internal VCO.

VCC_CAL

Power Supply for Internal Calibration Monitor Circuit. The voltage on the VCC_CAL pin

ranges from 3.15 V to 3.45 V. VCC_CAL must have the same value as AVDD, nominally 3.3 V.

VTUNE

Control Input to the VCO. This voltage determines the output frequency and is derived

from filtering the CPOUT output voltage.

DCL_BIAS

Internal Compensation Node for VCO Noise Roll-Off. Internally, the DCL_BIAS pin is

connected with 100 nF to GND, but larger capacitors to GND can be added if required.

14, 15

VCC_VCO

Power Supply for the VCO. The voltage on the VCC_VCO pin ranges from 4.75 V to

5.25 V. Place decoupling capacitors to the analog ground plane as close to the

VCC_VCO pin as possible. For optimal performance, this supply must be clean and

have low noise.

26, 27

VCC_IF2

5 V Supply to the IF Amplifier Connected to the IFOUT Pin.

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