MAX2365ETM+T【PDF 9/29 页】IC TRANSMITTER QUAD 48TQFN-EP

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Sheet目录55

5页 6页 7页 8页 [9页]10页 11页 12页 13页

Complete Dual-Band

Quadrature Transmitters

_______________________________________________________________________________________ 9

Pin Description

13, 14, 15

CLK, DI,

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

Bias Resistor Pin. BIAS is internally biased to approximately 600mV. An exter-

nal resistor between this pin to GND sets the bias current for the upconverters

and PA driver stages. The nominal resistor value is 10k&. This value can be

altered to optimize the linearity of the driver stage.

BIAS

10, 11

IFINH+,

IFINH-

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

The input impedance for these ports is nominally 400& differential. The IF fil-

ter 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.

The input impedance for these ports is nominally 400& differential. The IF fil-

ter should be AC-coupled to these ports. Keep the differential lines as short

as possible to minimize stray pickup and shunt capacitance.

IFINL+,

IFINL-

8, 9

TXGATE

Digital Input, Drive to Logic High for Normal Operation. A logic low on

TXGATE shuts down everything except the RF PLL, IF PLL, IF VCO, and seri-

al bus and registers. This mode is used for gated transmission.

Supply Pin for the Upconverter Stage. V

must be bypassed to system

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

capacitor should not be shared by any other branch.

IDLE

Digital Input, Drive to Logic High for Normal Operation. A logic low on IDLE

shuts down everything except the RF PLL and associated registers. A small

R-C lowpass can be used to filter digital noise.

Supply Pin for the Driver Stage. May be connected directly to the battery.

Bypass to PC board ground as close to the pin as possible. The ground vias

for the bypass capacitor should not be shared by any other branch.

CCDRV

LOCK

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

Requires a pullup resistor. Control using configuration register bits LD_MODE.

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. For split band PCS application, use RFH0 for the

1880MHz1910MHz range.

RFH0

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

can be connected directly to the battery.

RFL

MAX2361

MAX2365

FUNCTION

NAME

MAX2363

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