MAX2365ETM+T【PDF 10/29 页】IC TRANSMITTER QUAD 48TQFN-EP

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Sheet目录55

6页 7页 8页 9页 [10页]11页 12页 13页 14页

Complete Dual-Band

Quadrature Transmitters

10 ______________________________________________________________________________________

Pin Description (continued)

MAX2361

MAX2363

MAX2365

NAME

FUNCTION

16, 17

IFOUTH-,

IFOUTH+

Differential IF Outputs. These ports are active when the register bit IF_SEL is

1. They do not support FM mode. These pins must be inductively pulled up

to V

. A differential IF bandpass filter is connected between this port and

IFINH+ or IFINH-. The pullup inductors can be part of the filter structure. The

differential output impedance of this port is nominally 600&. The transmission

lines from these pins should be short to minimize the pickup of spurious sig-

nals and noise.

18, 19

IFOUTL-,

IFOUTL+

Differential IF Outputs. These ports are active when the register bit IF_SEL is

0. These pins must be inductively pulled up to V

. A differential IF band-

pass filter is connected between this port and IFINL+ and IFINL-. The pullup

inductors can be part of the filter structure. The differential output impedance

of this port is nominally 600&. The transmission lines from these pins should

be short to minimize the pickup of spurious signals and noise.

RF and IF Gain Control Analog Input. Apply 0.6V to 2.4V to control the gain of

the RF and IF stages. An RC filter on this pin should be used to reduce DAC

noise or PDM clock spurs from this line.

Supply Pin for the IF VGA. Bypass with a capacitor as close to the pin as

possible. The bypass capacitor must not share its ground vias with any other

branches.

Supply for the I/Q Modulator. Bypass with a capacitor as close to the pin as

possible. The bypass capacitor must not share its ground vias with any other

branches.

23, 24

Q+, Q-

Differential Q-Channel Baseband Inputs to the Modulator. These pins go

directly to the bases of a differential pair and require an external common-

mode bias voltage.

25, 26

I+, I-

Differential I-Channel Baseband Inputs to the Modulator. These pins go

directly to the bases of a differential pair and require an external common-

mode bias voltage.

SHDN

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

SHDN shuts down the entire IC except the serial interface and retains the

information in all registers. An R-C lowpass can be used to filter digital noise.

Supply Pin to the VCO Section. Bypass as close to the pin as possible. The

bypass capacitor should not share its vias with any other branches.

IFLO

Buffered LO Output. Control the output buffer using register bit BUF_EN and

the divide ratio using the register bit BUF_DIV.

30, 31

TANKL-,

TANKL+

Differential Tank Pins for the Low-Frequency IF VCO. These pins are internally

biased. VCO_SEL = 0 selects this IF VCO.

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