F1385 Datasheet

© 2022 Renesas Electronics Corporation

3

February 7, 2022

Pin Descriptions

Table 1. Pin Descriptions

Number

Name

Description

1

SW_LATCH Stand-by latch. Pull Low or Ground for Normal Operation. If left floating, this input will be internally pulled

high, disabling SPI writes to ENb (Standby) and RF SW bits (A0, A2).

2

RF_SEL

RF input selection. Pull high to select RF_INY. Pull low to select RF_INX.

3

RF_INY

Alternate RF Input. Separated from RF_INX by internal SP2T. AC couple to this pin. This is a reflective

switch and is not internally matched to 50 ohms.

4, 5, 6, 8,

11,15, 21,

22, 34, 36

GND

Ground these Pins.

7, 13, 29, 30,

31, 32, 33

NC

No Connection. Not internally connected. OK to connect to Vcc. Recommended Connection is Ground.

9, 16, 25

VCC

Power Supply. Bypass to GND with capacitors shown in the Typical Application Circuit as close as

possible to pin.

10

LO_ADJ

Connect the specified resistor from this pin to ground to set the LO path ICC. This is a current setting

resistor.

12

LO_IN

LO Input. AC couple to this pin. Internally matched to 50 ohms.

14

STBY

STBY Mode. Pull this pin high for Standby mode (~20 mA). Pull low or Ground for normal operation.

17

IF_BIAS_I

Connect the specified resistor from this pin to ground to set the IF amplifier bias reference. This is NOT a

current setting resistor.

18

IF_BIAS_Q Connect the specified resistor from this pin to ground to set the IF amplifier bias reference. This is NOT a

current setting resistor.

19

IF_I+

In-Phase Positive Port Mixer Differential IF Output. Connect pullup inductors from each of these pins to

VCC (see the Typical Application Circuit).

20

IF_I-

In-Phase Negative Port Mixer Differential IF Output. Connect pullup inductors from each of these pins to

VCC (see the Typical Application Circuit).

23

IF_Q-

Quadrature Negative Port Mixer Differential IF Output. Connect pullup inductors from each of these pins

to VCC (see the Typical Application Circuit).

24

IF_Q+

Quadrature Positive Port Mixer Differential IF Output. Connect pullup inductors from each of these pins to

VCC (see the Typical Application Circuit).

26

CSb

Chip Select Bar. The falling edge initiates a programming cycle and the rising edge latches the

programmed shift register data into the active register.

27

DATA

Serial Data Input.

28

CLK

Serial Clock Input.

35

RF_INX

Main RF Input. Separated from RF_INY by internal SP2T. AC couple to this pin. This is a reflective

switch and is not internally matched to 50 ohms.

— EP

Exposed Pad. Internally connected to GND. Solder this exposed pad to a PCB pad that uses multiple

ground vias to provide heat transfer out of the device into the PCB ground planes. These multiple

grounds are also required to achieve the noted RF performance.