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2.4GHz Monolithic
Voltage-Controlled Oscillator for Automotive
Detailed Description
Oscillator
The MAX2750AUA VCO is implemented as an LC oscil-
lator topology, integrating all of the tank components
on-chip. This fully monolithic approach provides an
extremely easy-to-use VCO, equivalent to a VCO mod-
ule. The frequency is controlled by a voltage applied to
the TUNE pin, which is internally connected to the var-
actor. The VCO core uses a differential topology to pro-
vide a stable frequency versus supply voltage and
improve the immunity to load variations. In addition,
there is a buffer amplifier following the oscillator core to
provide added isolation from load variations and to
boost the output power.
Output Buffer
Layout Issues
Always use controlled impedance lines (microstrip,
coplanar waveguide, etc.) for high-frequency signals.
Always place decoupling capacitors as close as possi-
ble to the V CC pins; for long V CC lines, it may be neces-
sary to add additional decoupling capacitors located
further from the device. Always provide a low-induc-
tance path to ground, and keep GND vias as close as
possible to the device. Thermal reliefs on GND pads
are not recommended.
Pin Configuration
The oscillator signal from the core drives an output
buffer amplifier. The amplifier is internally matched to
50 Ω including an on-chip DC-blocking capacitor. No
external DC-blocking capacitor is required, eliminating
the need for any external components. The output
TOP VIEW
BYP 1
TUNE 2
+
8
7
GND
OUT
amplifier has its own V CC and GND pins to minimize
MAX2750AUA
load-pulling effects. The amplifier boosts the oscillator
GND
3
6
V CC2
signal to a level suitable for driving most RF mixers.
SHDN 4
5
V CC1
Applications Information
Tune Input
The tuning input is typically connected to the output of the
PLL loop filter. The loop filter provides an appropriately
low-impedance source. The input may incorporate an
extra RC filter stage to reduce high-frequency noise and
spurious signals. Any excess noise on the tuning input is
directly translated into FM noise, which can degrade the
phase-noise performance of the oscillator. Therefore, it is
important to minimize the noise introduced on the tuning
input. A simple RC filter with low corner frequency is
needed during testing to filter the noise present on the
voltage source driving the tuning line.
MAX
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相关代理商/技术参数
MAX2750AUA+T
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2750EUA
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2750EUA+
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2750EUA+T
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2750EUA-T
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2750EVKIT
功能描述:时钟和定时器开发工具 MAX2750-52 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Modules 类型:Clock Conditioners 工具用于评估:LMK04100B 频率:122.8 MHz 工作电源电压:3.3 V
MAX2751EUA
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
MAX2751EUA+
功能描述:VCO振荡器 2.4-2.5GHz Mono V-Controlled Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C