U4311B
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U4311B
Low-Current Superhet Remote Control Receiver
U4311B monolithic Integrated Circuit bipolar technology low-current remote control superheterodyne receivers amplitude- frequencymodulated mode. Typical applications keyless lock-, alarm telecontrol remote indication systems. Especially automotive applications supports superhet design with about total current consumption, required manufacturers.
Features
Usable amplitude- frequency- modulated
transmission systems
Extremely quiescent current approximately
stand-by mode wake-up concept
Wide power supply voltage range Sensitive IF-amplifier 10.7 operating
frequency
Logarithmic demodulator demodulator Monoflop exit wake microcontroller High performance operational amplifier realize data recovering filter depending hysteresis data regeneration
Non-inverting clamping comparator with amplitude-
Block Diagram
Wake
VRef 2.4V Bandgap Internal VRef Monoflop Level Wake invert. clamping comparator Data
10.7 amplifier Quadrature detector Data filter Operational amplifier
9968
10.7
Figure Block diagram
Rev. 23.06.1995
(14)
U4311B
OPin+ OPout RCwake GND2 Compout AMout
10322
OPin- FMout VRef Discr GND1 SWout IFin
Symbol OPin+ OPout RCwake GND2 Compout AMout IFin SWout GND1 Discr Vref FMout OPin-
Function amplifier inverted input amplifier output wake reset time Ground logical circuits Comparator output Comparator time constant Comparator time constant current output input Wake output Ground analog circuits discriminator tank Reference voltage discriminator output Supply voltage amplifier inverted input
Internal connections figures
Figure description
Absolute Maximum Ratings
Parameters Supply voltage Power dissipation Tamb 85°C Junction temperature Ambient temperature Storage temperature Symbol Ptot Tamb Tstg Value +125 Unit
Thermal Resistance
Junction ambient Parameters DIP16 SO16L Symbol RthJA RthJA Value Unit
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Rev. 23.06.1995
U4311B
Electrical Characteristics
Tamb 25°C, 10.7 MHz; part: fmod kHz, fdev 22.5 kHz; part: fmod kHz, 100% unless otherwise specified Parameters Characteristics Supply voltage range Quiescent supply current Active supply current Bandgap Regulated voltage Output current Source resistance External capacitor Power supply rejection ratio amplifier Input resistance Input capacitance Typical internal frequency limiting point Recovered data voltage detector output resistance rejection ratio Maximum input voltage quiescent current Maximum current Operational amplifier Gain bandwidth product Excess phase Open loop gain Output voltage range Common mode input voltage Input offset voltage Maximum output current Common mode rejection ratio Total harmonic distortion Power supply rejection ratio Test Conditions Pins Symbol Iact Vref Iref Rref Cref psrr Min. Typ. Max. Unit
level dBmV Pins Pins Pins Pins Pins Pins Pins kHz, unity gain circuit
f3dB VFM3dB VFMout RFMout AMrr VAMmax IAMout IAMoutmax
dBmV dBmV
1.55
degree
-2.5
Vout Iout cmrr psrr
+2.5
Rev. 23.06.1995
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U4311B
Parameters Clamping comparator Typical common mode input voltage range Maximum distortion voltage Test Conditions Pins Vsignal fdisto fsignal load VRef) load VRef) Pins Pins Symbol Vcmvr Vdmax
Min. Typ. Max. Unit
Output voltage
Vcout
VRef
Output voltage
Vcout
Wake circuit Minimum wake level Internal charging resistor Threshold voltage Output switch current Output switch voltage External wake resistor External wake capacitor Hold time 30%) Delay time 30%) Measured referred
Rint
0.75
dBmV2)
version with inverting comparator available: U4313B
Protected Z-diode, figure Valid
Application
U4311B well-suited implement remote control data transmission systems, based lowcurrent superheterodyne receiver concept. SAW-devices used transmitter well receiver local oscillator. front should discrete circuit application with current UHF-transistors like S822T S852T from TEMIC TELEFUNKEN microelectronic GmbH. frequency local oscillator determined either coaxial resonators SAW-devices. large SAW-resonator tolerance IF-bandwidth FM-system additionally discriminator amplitude characteristic (figure higher proposed. circuit needs only supply voltage operation front stacked design order achieve total receiver current consumption approximately Figure shows principle receiver concept diagram. application notes ANT012, ANT013, ANT015 contain more detailed information complete links.
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Rev. 23.06.1995
U4311B
used wake microcontroller. After adjustable reset time, determined monoflop time constant, integrated circuit rests down sleep mode. this case typically supply current required. external resistor matched ground blocks wake-up circuit gives fully function lower IF-level recognize figures supply current increases typically Function clamping comparator output signal operational amplifier input non-inverting comparator peak detectors figure Their time constants distinguished RC-. components value must adapted transmission code. time constant should large compared bit-rate optimized noise suppression. compensate input transistors base-emitter-voltage differences these signals buffered mean value used comparator threshold, difference peak values controls hysteresis. This clamping comparator works data regenerator. Another version with inverting clamping comparator, also available (U4313B). Therefore operational amplifier used either noninverting inverting filter without need additional components.
VRef
Circuit General functions integrated circuit U4311B includes following functions: IF-amplifier, FM-demodulator, wake-up circuit with monoflop, operational-amplifier, noninverting data comparator voltage-regulator. 10.7 IF-signal from front passes integrated IF-amplifier which operates amplitude- frequency-modulated signals either logarithmic AMdemodulator which implemented avoid settling time problems effected automatic gain control system quadrature detector data shaping filter advantageously realized with internal high performance operational-amplifier reduces system bandwidth optimized compromise regarding transmission distance data recognition. Thus, optimal error rate achieved without further active component.
comparator connected output filter level-dependent hysteresis clamps reference voltage signal minimum maximum peaks described later. Without IF-input signal normal mode only IF-amplifier demodulator which operates level strength indicator activated. level signal increases, whole circuitry turned wake-up circuit. This signal externally available
9969
Hysteresis amp. Comp. threshold Comparator
Figure Principle function clamping comparator
Rev. 23.06.1995
(14)
U4311B
Internal Circuitry
9970
VRef
9972
Figure RCwake
Figure OPin+
9973
Figure GND2 VRef
9971 9974
Figure OPout
Figure Compout
(14)
Rev. 23.06.1995
VRef
9975
U4311B
VRef
10126
Figure AMout
10127
Figure
VRef
Figure IFin
10128
10125
Figure
Figure SWout
Rev. 23.06.1995
(14)
U4311B
10129
VRef
Figure GND1
10132
Figure FMout
10133 10130
Figure
Figure Discr
10134
VRef
10131
Figure VRef
Figure OPin-
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Rev. 23.06.1995
U4311B
1400 1300 Output Vout 1200
0.005
0.004
0.003 1100 0.002 1000 0.001 Input Time
10333
Figure Time domain response Bessel pass data filter
dBmV Output current dBmV
Data Recovering Filter
test circuit figures includes example data recovering filter realized with components second order Bessel type with pass characteristic, cut-off frequency additional high pass characteristic suppressing frequency components. Simulation time domain frequency response drawn figures This filter gives typical application kBaud Manchester code amplitude modulated transmission. capacitor responsible high pass cut-off frequency. correct pulse response this high pass cutoff frequency should possible. Figure shows transient response influence component. first pulses might wrong high pass cut-off frequency low. this reason some burst bits must transmitted before real data transmission starts. other hand, cut-off frequency high, might trouble with roof shaping rectangle pulses operational amplifier output. pass cut-off frequency maximum transimpedance Vout/Iin distinguished further external elements. Careful design data filter gives optimized transmission range. designing other filter parameters look filter design handbooks programs request TEMIC TELEFUNKEN microelectronic GmbH support. Some proposals found application notes ANT012, ANT013 ANT015.
dBmV dBmV
10332
frequency
Figure IF-frequency response
0.01
10334
Frequency
Figure Frequency response Bessel pass data filter
Rev. 23.06.1995
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U4311B
input
Wake
Comparator output
Data filter output
Wake
Figure test circuit with Bessel pass data filter
LP-filter output voltage Vs+n/Vn
(high level) (low level) output current
IF-input level dmBV
10276
+25°C +85°C
-40°C
10292
IF-input level (dBmV
Figure Signal noise ratio
Figure AM-demodulator characteristic temperature
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Rev. 23.06.1995
10135
Filter
U4311B
TOKO A119ACS-19000Z
input Wake
Data filter output Wake Comparator output
Figure test circuit with Bessel pass data filter
LP-filter output voltage Vs+n/Vn
Output voltage
10.3
10290
10291
IF-input level dmBV
10.5
10.7
10.9
10136
11.1
Frequency
Figure Signal noise ratio deviation 22.5
Figure FM-discriminator characteristic
Rev. 23.06.1995
(14)
U4311B
Data
Signal path Power supply Figure Principle diagram remote control receiver
10137
Ordering Information
Extended Type Number U4311B-C U4311B-CFL Package DIP16 SO16L Remarks
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Rev. 23.06.1995
U4311B
Dimensions
Package: DIP16
9128
Package: SO16L
8961
Rev. 23.06.1995
(14)
U4311B
Ozone Depleting Substances Policy Statement
policy TEMIC TELEFUNKEN microelectronic GmbH
Meet present future national international statutory requirements. Regularly continuously improve performance products, processes, distribution operating systems with respect their impact health safety employees public, well their impact environment. particular concern control eliminate releases those substances into atmosphere which known ozone depleting substances ODSs). Montreal Protocol 1987) London Amendments 1990) intend severely restrict ODSs forbid their within next years. Various national international initiatives pressing earlier these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division been able policy continuous improvements eliminate ODSs listed following documents. Annex list transitional substances Montreal Protocol London Amendments respectively Class ozone depleting substances Clean Amendments 1990 Environmental Protection Agency EPA) Council Decision 88/540/EEC 91/690/EEC Annex transitional substances respectively. TEMIC certify that semiconductors manufactured with ozone depleting substances contain such substances.
reserve right make changes improve technical design without further notice. Parameters vary different applications. operating parameters must validated each customer application customer. Should buyer TEMIC products unintended unauthorized application, buyer shall indemnify TEMIC against claims, costs, damages, expenses, arising directly indirectly, claim personal damage, injury death associated with such unintended unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 7131 2831, number: 7131 2423
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Rev. 23.06.1995
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