MAX2309EVKIT【PDF 8/20 页】EVAL KIT

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CDMA IF VGAs and I/Q Demodulators

with VCO and Synthesizer

Pin Description (continued)

MAX2306

25

26

27

—

—

PIN

MAX2308

25

26

27

28

—

Exposed Paddle

MAX2309

25

26

27

21

28

NAME

BYP

CP_OUT

GND

N.C.

DIVSEL

EP

FUNCTION

Bypass Node. Must be capacitively decoupled (bypassed)

to ground.

Charge-Pump Output

Ground

No Connection

High selects M1/R1; low selects M2/R2.

Ground

_______________Detailed Description

MAX2306

The MAX2306 is intended for dual-band (PCS and cel-

lular) and dual-mode code division multiple access

(CDMA) and FM applications (Figure 1). The device

includes an IF variable-gain amplifier, quadrature

demodulator, dual VCOs, and dual-frequency synthe-

sizers (Functional Diagram ). Dual VCOs are provided

for applications using different IF frequencies for each

mode or band of operation. The analog FM output sig-

nal can be configured for conversion to the I channel,

or it may be converted in quadrature to both the I and

Q channels. The MAX2306 ’s operation modes are

described in Table 1. These modes are set by pro-

gramming the control register and setting logic levels

on control pins. If MODE is left floating, the internal reg-

ister controls the operation. If driven high or low, mode

will override certain register bits, as shown in Table 1.

MAX2308

The MAX2308 supports dual-band, triple mode with

common IF VCO. As with the MAX2306, the FM mode

can be configured for conversion to the I port or quad-

rature conversion to both the I and Q ports (Figure 2).

The MAX2308’s operational modes are described in

Table 2. These modes are set by programming the con-

trol register.

MAX2309

The MAX2309 quadrature demodulators are simplified

versions of the MAX2306 that can be used in single-

mode CDMA or triple mode using an external FM dis-

criminator (Figure 3). The MAX2309 VCO is optimized

for the 67MHz to 300MHz IF frequency range.

The MAX2309 includes a buffered output for the VCO.

The buffered VCO output can be used to support sys-

tems implementing traditional limiting IF stages for FM

demodulation in dual-mode phones as well as for the

transmit LO in TDD systems. This buffered output can

be configured for the VCO frequency (twice the IF fre-

quency) or one-half the VCO frequency (IF frequency).

The BUFEN pin enables this feature. A standby mode,

in which only the VCO and synthesizer are operational,

can be selected through the serial interface or the

STBY pin. The MAX2309 ’s operational modes are

described in Table 3. These modes are set by pro-

gramming the control register and/or setting logic levels

on control pins. If the control pins ( STBY , BUFEN ,

DIVSEL) are left floating, the internal register controls

the operational mode. If driven high or low, the control

pins will override certain register bits, as shown in

Table 3.

Applications Information

Variable-Gain Amplifier and Demodulator

The MAX2306 family provides a VGA with exceptional

gain range. The MAX2306/MAX2308 support multimode

applications with dual differential inputs, selectable with

the IN_SEL (IS) control bit. On the MAX2306, this func-

tion can be controlled with the MODE pin, which over-

rides the IS control bit. The VGA’s gain is controlled

over a 110dB range with the VGC pin. The output of the

VGA drives the RF ports of a quadrature demodulator.

The MAX2306/MAX2308 provide two types of FM

demodulation, controlled by the FM_TYPE (FT) control

bit. When FM_TYPE is “1,” the signal is passed through

both the I and Q signal paths for subsequent lowpass

filtering and A/D conversion at baseband. If FM_TYPE

is “0,” the FM signal is passed through the I mixer only.

8

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