Complete Dual-Band

Quadrature Transmitters

8

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Pin Description

MAX2360

PIN

NAME

FUNCTION

MAX2368

MAX2367

1

—

1

RFL

Transmitter RF Output for Cellular Band (800MHz to 1000MHz)—for both FM

and digital modes. This open-collector output requires a pullup inductor to

the supply voltage, which may be part of the output matching network and

may be connected directly to the battery.

No Connection. Make no connection to these pins.

N.C.

2, 10, 11,

16, 17,

32–35

43, 47

1, 8, 9, 18,

19, 30, 31,

34, 35, 44

—

2

2

—

RFH0

Transmitter RF Output for PCS Band (1700MHz to 2000MHz). This open-

collector output requires a pullup inductor to the supply voltage. The pullup

inductor may be part of the output matching network and may be connected

directly to the battery.

Open-Collector Output Indicating Lock Status of the IF and/or the RF PLLs.

Requires a pullup resistor. Control using configuration register bit LD_MODE0,

LD_MODE1.

LOCK

3

3

3

4

4

4

Power Supply

Digital Input. A logic low on IDLE shuts down everything except the RF PLL

and associated registers. A small R-C lowpass filter may be used to prevent

digital noise.

IDLE

5

5

5

6

6

6

ground as close to the pin as possible. The ground vias for the bypass

capacitor should not be shared by any other branch.

Digital Input. A logic low on TXGATE shuts down everything except the RF

PLL, IF PLL, IF VCO, and serial bus and registers. This mode is used for

gated transmission.

TXGATE

7

7

7

8, 9

—

8, 9

IFINL+,

IFINL-

Differential Inputs to the RF Upconverter. These pins are internally biased to

+1.5V. The input impedance for these ports is nominally 400

Ω differential.

The IF filter should be AC-coupled to these ports. Keep the differential lines

as short as possible to minimize stray pickup and shunt capacitance.

Differential Inputs to the RF Upconverter. These pins are internally biased to

+1.5V. The input impedance for these ports is nominally 400

Ω differential.

The IF filter should be AC-coupled to these ports. Keep the differential lines

as short as possible to minimize stray pickup and shunt capacitance.

IFINH+,

IFINH-

—

10, 11

10, 11

12

12

12

Bias Resistor Pin. RBIAS is internally biased to a bandgap voltage of +1.18V. An

external resistor or current source must be connected to this pin to set the bias

current for the upconverters and PA driver stages. The nominal resistor value is

16k

Ω. This value can be altered to optimize the linearity of the driver stage.

Input Pins from the 3-Wire Serial Bus (SPI/QSPI/MICROWIRE compatible).

An R-C filter on each of these pins may be used to reduce noise.

CLK, DI,

CS

13, 14, 15

13, 14, 15

13, 14, 15

MAX2366