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| 型号： | MAX2620EUA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC RF OSC W/BUFFERED OUT 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | RF 振荡器 |
| 频率： | 10MHz ~ 1GHz |
| RF 型： | 手机，WSM，NPCS |
| 次要属性： | 缓冲输出 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
V CC
V CC
10 ?
L3*
220nH
1000pF
C13*
TEST PORT
1000pF
1 V CC 1
2 TANK
MAX2620
OUT 8
V CC 2 7
VCC
1000pF
OUT
Z O = 50 ?
V CC
C2*
1000pF
C3*
2.7pF
C4*
1pF
3 FDBK
4 SHDN
BIAS
SUPPLY
GND 6
OUT 5
1000pF
C10*
1000pF
OUT
Z O = 50 ?
ON
OFF
51 ?
V CC
*AT 10MHz, CHANGE TO:
10 ?
1000pF
1000pF
C3 = C4 = 270pF
L3 = 10 μ H
C2 = C10 = C13 = 0.01 μ F
Figure 1. 900MHz Test Circuit
_______________Detailed Description
Oscillator
The oscillator is a common-collector, negative-
resistance type that uses the IC’s internal parasitic ele-
ments to create a negative resistance at the base-
emitter port. The transistor oscillator has been opti-
mized for low-noise operation. Base and emitter leads
are provided as external connections for a feedback
capacitor and resonator. A resonant circuit, tuned to
the appropriate frequency and connected to the base
lead, will cause oscillation. Varactor diodes may be
used in the resonant circuit to create a voltage-con-
trolled oscillator (VCO). The oscillator is internally
biased to an optimal operating point, and the base and
emitter leads need to be capacitively coupled due to
the bias voltages present.
Output Buffers
The output buffers (OUT and OUT ) are an open-
collector, differential-pair configuration and provide
load isolation to the oscillator. The outputs can be used
__________Applications Information
Design Principles
At the frequency of interest, the MAX2620 portion of
Figure 2 shows the one-port circuit model for the TANK
pin (test port in Figure 1).
For the circuit to oscillate at a desired frequency, the res-
onant tank circuit connected to TANK must present an
impedance that is a complement to the network
(Figure 2). This resonant tank circuit must have a positive
real component that is a maximum of one-half the magni-
tude of the negative real part of the oscillator device, as
well as a reactive component that is opposite in sign to
the reactive component of the oscillator device.
TANK
differentially to drive an integrated circuit mixer.
Alternatively, isolation is provided between the buffer
outputs when one output drives a mixer (either upcon-
version or downconversion) and the other output drives
LESS THAN 1/2
TIMES R L
jX L
RESONANT
TANK
-jX T
OSCILLATOR
DEVICE
-R n
a prescaler. The isolation in this configuration prevents
prescaler noise from corrupting the oscillator signal’s
spectral purity.
A logic-controlled SHDN pin turns off all bias to the IC
when pulled low.
Figure 2. Simplified Oscillator Circuit Model
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2620EVKIT | 功能描述:时钟和定时器开发工具 MAX2620 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 |
| MAX2622EUA | 功能描述:VCO振荡器 855MHz - 881MHz Mono V Ctrld 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 |
| MAX2622EUA+ | 功能描述:VCO振荡器 855MHz - 881MHz Mono V Ctrld 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 |
| MAX2622EUA+T | 功能描述:VCO振荡器 855MHz - 881MHz Mono V Ctrld 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 |
| MAX2622EUA-T | 功能描述:VCO振荡器 855MHz - 881MHz Mono V Ctrld 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 |
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