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SA606DK/01

更新时间： 2024-02-06 03:18:02
品牌 Logo 应用领域
恩智浦 - NXP 电信光电二极管电信集成电路
页数 文件大小 规格书
33页 536K
描述
IC SPECIALTY TELECOM CIRCUIT, PDSO20, 4.40 MM, PLASTIC, MO-152, SOT266-1, SSOP-20, Telecom IC:Other

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SA606DK/01 技术参数

Source Url Status Check Date：2013-06-14 00:00:00是否无铅： 含铅
是否Rohs认证： 符合生命周期：Active
Reach Compliance Code：unknown风险等级：5.61
Base Number Matches：1

SA606DK/01 数据手册

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SA606  
NXP Semiconductors  
Low-voltage high performance mixer FM IF system  
7. Functional description  
The SA606 is an IF signal processing system suitable for second IF systems with input  
frequency as high as 150 MHz. The bandwidth of the IF amplifier and limiter is at least  
2 MHz with 90 dB of gain. The gain/bandwidth distribution is optimized for 455 kHz,  
1.5 ksource applications. The overall system is well-suited to battery operation as well  
as high performance and high quality products of all types.  
The input stage is a Gilbert cell mixer with oscillator. Typical mixer characteristics include  
a noise figure of 6.2 dB, conversion gain of 17 dB, and input third-order intercept of  
9 dBm. The oscillator will operate in excess of 200 MHz in L/C tank configurations.  
Hartley or Colpitts circuits can be used up to 100 MHz for crystal configurations. Butler  
oscillators are recommended for crystal configurations up to 150 MHz.  
The output impedance of the mixer is a 1.5 kresistor permitting direct connection to a  
455 kHz ceramic filter. The input resistance of the limiting IF amplifiers is also 1.5 k. With  
most 455 kHz ceramic filters and many crystal filters, no impedance matching network is  
necessary. The IF amplifier has 43 dB of gain and 5.5 MHz bandwidth. The IF limiter has  
60 dB of gain and 4.5 MHz bandwidth.  
To achieve optimum linearity of the log signal strength indicator, there must be a 12 dBV  
insertion loss between the first and second IF stages. If the IF filter or interstage network  
does not cause 12 dBV insertion loss, a fixed or variable resistor or an L pad for  
simultaneous loss and impedance matching can be added between the first IF output  
(IF_AMP_OUT) and the interstage network. The overall gain will then be 90 dB with  
2 MHz bandwidth.  
The signal from the second limiting amplifier goes to a Gilbert cell quadrature detector.  
One port of the Gilbert cell is internally driven by the IF. The other output of the IF is  
AC-coupled to a tuned quadrature network. This signal, which now has a 90phase  
relationship to the internal signal, drives the other port of the multiplier cell.  
The demodulated output of the quadrature drives an internal op amp. This op amp can be  
configured as a unity gain buffer, or for simultaneous gain, filtering, and second-order  
temperature compensation if needed. It can drive an AC load as low as 5 kwith a  
rail-to-rail output.  
A log signal strength indicator completes the circuitry. The output range is greater than  
90 dB and is temperature compensated. This log signal strength indicator exceeds the  
criteria for AMPS or TACS cellular telephone. This signal drives an internal op amp. The  
op amp is capable of rail-to-rail output. It can be used for gain, filtering, or second-order  
temperature compensation of the RSSI, if needed.  
Remark: dBV = 20log VO/VI.  
SA606  
All information provided in this document is subject to legal disclaimers.  
© NXP B.V. 2013. All rights reserved.  
Product data sheet  
Rev. 6 — 8 November 2013  
6 of 33  
 
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