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參數(shù)資料
| 型號： | MAX2620EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO8 |
| 封裝： | MICRO, MAX-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 105K |
| 代理商： | MAX2620EUA |
M
10MHz to 1050MHz Integrated
RF Osc illator with Buffered Outputs
_______________________________________________________________________________________
7
_______________Detailed Desc ription
Osc illator
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
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
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.
__________Applic ations Information
Design Princ iples
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.
-R
n
LESS THAN 1/2
TIMES R
L
-jX
T
TANK
jX
L
RESONANT
TANK
OSCILLATOR
DEVICE
Figure 2. Simplified Oscillator Circuit Model
MAX2620
1
2
VCC1
TANK
FDBK
SHDN
3
4
8
OUT
VCC2
OUT
GND
7
6
5
V
CC
V
CC
V
CC
V
CC
V
CC
TEST PORT
BIAS
SUPPLY
C13*
1000pF
C2*
1000pF
ON
OFF
1000pF
1000pF
1000pF
10
10
L3*
220nH
51
C3*
2.7pF
C4*
1pF
1000pF
1000pF
C10*
1000pF
Z
O
= 50
*AT 10MHz, CHANGE TO:
C3 = C4 = 270pF
L3 = 10
μ
H
C2 = C10 = C13 = 0.01
μ
F
Z
O
= 50
OUT
OUT
Figure 1. 900MHz Test Circuit
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相關代理商/技術參數(shù) |
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| MAX2620EUA+ | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EUA+T | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EUA-T | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EVKIT | 功能描述:時鐘和定時器開發(fā)工具 MAX2620 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| MAX2622EUA | 功能描述:VCO振蕩器 855MHz - 881MHz Mono V Ctrld Osc RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
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