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參數(shù)資料
| 型號： | MAX2306 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer |
| 中文描述： | CDMA IF VGA及I/Q解調器，帶有VCO及合成器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 295K |
| 代理商： | MAX2306 |
M
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________
9
Voltage-Controlled Oscillator,
Buffers, and Quadrature Generation
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.
The MAX2309 buffers the output of the VCO and pro-
vides this signal at the LOOUT pin. This signal is
enabled by the
BUFEN
(BE) control bit or by the
BUFEN
control pin. The frequency of this signal is
selected by the BUF_DIV (BD) control bit, and can be
either the VCO frequency or half the VCO frequency.
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.
Figure 1. MAX2306 Typical Operating Circuit
MAX2306
TANKL-
BYP
BYP
FM-
FM+
CDMA+
CDMA
FM
3-WIRE
DAC
0.1
μ
F
0.01
μ
F
0.068
μ
F
47pF
2pF
33pF
0.01
μ
F
10k
2.4k
10k
33pF
47pF
33nH
0.01
μ
F
680
CDMA-
LOCK
VGC
V
CC
V
CC
V
CC
V
CC
DATA
CLK
QOUT+
QOUT-
EN
TANKH-
IOUT-
IOUT+
REF
GND
V
CC
MODE
TANKH+
GND
CP_OUT
BYP
SHDN
TANKL+
0.01
μ
F
V
CC
47pF
10k
47k
Q
10k
2pF
33pF
10k
10k
33pF
I
33nH
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| MAX2306EGI | CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer |
| MAX2308EGI | CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2306EGI | 功能描述:調節(jié)器/解調器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| MAX2306EGI-T | 功能描述:調節(jié)器/解調器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| MAX2306ETI+ | 功能描述:調節(jié)器/解調器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| MAX2306ETI+T | 功能描述:調節(jié)器/解調器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| MAX2306EVKIT | 功能描述:射頻開發(fā)工具 MAX2306/8/9 Eval Kit RoHS:否 制造商:Taiyo Yuden 產品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
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