ADRF6755ACPZ-R7 datasheet(12/48 Pages) AD

12 / 48 page

ADRF6755

Data Sheet

Rev. B | Page 12 of 48

Pin No.

Mnemonic

Description

SDI/SDA

Serial Data Input for SPI Port/Serial Data Input/Output for I2C Port. In SPI mode, this pin is a high

impedance CMOS data input, and data is loaded in an 8-bit word. In I2C mode, this pin is a bidirec-

tional port.

CLK/SCL

Serial Clock Input for SPI/I2C Port. This serial clock is used to clock in the serial data to the registers.

This input is a high impedance CMOS input.

SDO

Serial Data Output for SPI Port. Register states can be read back on the SDO data output line.

REFIN

Reference Input. This high impedance CMOS input should be ac-coupled.

REFIN

Reference Input Bar. This pin should be either grounded or ac-coupled to ground.

RFOUT

RF Output. Single-ended, 50 Ω, internally biased RF output. This pin must be ac-coupled to the load.

TXDIS

Output Disable. This pin can be used to disable the RF output. Connect to a high logic level to

disable the output. Connect to a low logic level for normal operation.

25, 26

LOMON,

LOMON

Differential Monitor Outputs. These pins provide a replica of the internal local oscillator frequency

(1× LO) at four different power levels: −6 dBm, −12 dBm, −18 dBm, and −24 dBm, approximately.

These open-collector outputs must be terminated with external resistors to REGOUT. These outputs

can be disabled through serial port programming and should be tied to REGOUT if not used.

8, 10

No Connect. Do not connect to these pins.

LDET

Lock Detect. This output pin indicates the state of the PLL: a high level indicates a locked condition,

whereas a low level indicates a loss of lock condition.

MUXOUT

Mux Output. This pin is a test output for diagnostic use only. Do not connect to this pin.

Exposed Paddle

Exposed Paddle. Connect to ground plane via a low impedance path.

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