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SA617 PDF预览

SA617

更新时间: 2024-01-01 16:01:43
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
17页 140K
描述
Low-voltage high performance mixer FM IF system

SA617 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:DIP, DIP20,.3Reach Compliance Code:unknown
风险等级:5.78JESD-30 代码:R-PDIP-T20
JESD-609代码:e0端子数量:20
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装等效代码:DIP20,.3封装形状:RECTANGULAR
封装形式:IN-LINE电源:3 V
认证状态:Not Qualified子类别:Receiver ICs
最大压摆率:5 mA表面贴装:NO
技术:BIPOLAR温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
Base Number Matches:1

SA617 数据手册

 浏览型号SA617的Datasheet PDF文件第2页浏览型号SA617的Datasheet PDF文件第3页浏览型号SA617的Datasheet PDF文件第4页浏览型号SA617的Datasheet PDF文件第6页浏览型号SA617的Datasheet PDF文件第7页浏览型号SA617的Datasheet PDF文件第8页 
Philips Semiconductors  
Product specification  
Low-voltage high performance mixer FM IF system  
SA617  
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  
CIRCUIT DESCRIPTION  
The SA617 is an IF signal processing system suitable for second IF  
systems with input frequency as high as 150MHz. The bandwidth of  
the IF amplifier and limiter is at least 2MHz with 90dB of gain. The  
gain/bandwidth distribution is optimized for 455kHz, 1.5ksource  
applications. The overall system is well-suited to battery operation  
as well as high performance and high quality products of all types.  
quadrature network. This signal, which now has a 90° phase  
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 2nd-order temperature  
compensation if needed. It can drive an AC load as low as 2kwith  
a rail-to-rail output.  
The input stage is a Gilbert cell mixer with oscillator. Typical mixer  
characteristics include a noise figure of 6.2dB, conversion gain of  
17dB, and input third-order intercept of –9dBm. The oscillator will  
operate in excess of 200MHz in L/C tank configurations. Hartley or  
Colpitts circuits can be used up to 100MHz for xtal configurations.  
Butler oscillators are recommended for xtal configurations up to  
150MHz.  
A log signal strength completes the circuitry. The output range is  
greater than 90dB and is temperature compensated. This log signal  
strength indicator exceeds the criteria for AMPs or TACs cellular  
telephone. This signal is buffered through an internal unity gain op  
amp. The frequency check pin provides a buffered limiter output.  
This is useful for implementing an AFC (Automatic Frequency  
Check) function. This same output can also be used in conjunction  
with limiter output (Pin 11) for demodulating FSK (Frequency Shift  
Keying) data. Both pins are of the same amplitude, but 180° out of  
phase.  
The output impedance of the mixer is a 1.5kresistor permitting  
direct connection to a 455kHz ceramic filter. The input resistance of  
the limiting IF amplifiers is also 1.5k. With most 455kHz ceramic  
filters and many crystal filters, no impedance matching network is  
necessary. The IF amplifier has 43dB of gain and 5.5MHz  
bandwidth. The IF limiter has 60dB of gain and 4.5MHz bandwidth.  
To achieve optimum linearity of the log signal strength indicator,  
there must be a 12dB(v) insertion loss between the first and second  
IF stages. If the IF filter or interstage network does not cause  
12dB(v) 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 (Pin 16) and the interstage network. The overall  
gain will then be 90dB with 2MHz bandwidth.  
NOTE: Limiter output or Frequency Check output has drive  
capability of a load minimum of 2kor higher to obtain 115mV  
output level.  
NOTE: dB(v) = 20log V  
/V  
OUT IN  
5
1997 Nov 07  

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