Datasheet > MAX2308

MAX2308

更新时间： 2023-12-20 18:44:05

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	192K
描述
CDMA IF VGA及I/Q解调器，带有VCO及合成器

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数据手册

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MAX2308 数据手册

CDMA IF VGAs a n d I/Q De m o d u la t o rs

w it h VCO a n d S yn t h e s ize r

47pF

0.01µF

2.4kΩ

0.01µF

0.1µF

BYP

FM-

0.068µF

0.01µF

CP_OUT

GND

33pF

10kΩ

FM+

TANKL+

CDMA+

2pF

33nH

33pF

CDMA

MAX2306

680Ω

10kΩ

TANKL-

CDMA-

VGC

33pF

TANKH+

DAC

47pF

2pF

33pF

10kΩ

TANKH-

MODE

DATA

47pF

3-WIRE

GND

REF

CLK

SHDN

IOUT+

QOUT+

10kΩ

47kΩ

IOUT-

QOUT-

LOCK

Figure 1. MAX2306 Typical Operating Circuit

The MAX2309 buffers the output of the VCO and pro-

vid e s this s ig na l a t the LOOUT p in. This s ig na l is

e na b le d b y the BUFEN (BE) c ontrol b it or b y the

BUFEN c ontrol p in. The fre q ue nc y of this s ig na l is

selected by the BUF_DIV (BD) control bit, and can be

either the VCO frequency or half the VCO frequency.

Vo lt a g e -Co n t ro lle d Os c illa t o r,

Bu ffe rs , a n d Qu a d ra t u re Ge n e ra t io n

The LO signal for downconversion is provided by a

voltage-controlled oscillator (VCO) consisting of an on-

chip differential oscillator, and an off-chip high-Q reso-

nant network. Figure 4 shows a simplified schematic of

the VCO oscillator. Multiband operation is supported by

the MAX2306 with dual VCOs. VCO_H and VCO_L are

selectable with the MODE pin or the VCO_SEL (VS)

control bit. They oscillate at twice the desired LO fre-

quency. For applications requiring an external LO, the

VCOs can be bypassed with the VCO_BYP (VB) control

bit.

Quadrature downconversion is realized by providing in-

phase (I) and quadrature-phase (Q) components of the

LO signal to the LO ports of the demodulator described

above. The quadrature LO signals are generated by

dividing the VCO output frequency using two latches.

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