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U4313B
Low-Current Superhet Remote-Control Receiver
Description
The U4313B is a monolithic integrated circuit in bipolar technology for low-current UHF remote-control superheterodyne receivers in amplitude- or frequencymodulated mode. Typical applications are keyless car lock-, alarm- or tele-control remote indication systems. Especially for automotive applications, it supports a superhet design with less than 1 mA total current consumption, as required by the car manufacturers.
Features
D Usable for amplitude- and frequency-modulated
transmission systems
D Extremely low quiescent current (approximately
1 mA in standby mode due to wake-up concept)
D Wide power supply voltage range (3 to 13 V) D Sensitive IF amplifier for 10.7-MHz operating
frequency
D D D D
Logarithmic AM demodulator FM demodulator Monoflop exit to wake up a microcontroller High-performance operational amplifier to realize a data recovering filter depending hysteresis for data regeneration
D Inverting clamping comparator with amplitude-
Block Diagram
Wake-up out
VS 10 VRef = 2.4V 13 Bandgap 11 Internal VRef = 2.4 V Monoflop RF Level Wake up Inveting clamping comparator 3 7 6 5 Data out
10.7 MHz 9 IF amplifier Quadrature detector - 4 8 log AM out 12 14 FM out Data filter 16 Operational amplifier + 1
95 10213
2
10.7 MHz
Figure 1. Block diagram
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U4313B
Pin Description
OPin+ OPout RCwake GND2 Compout RC- RC+ AMout 1 2 3 4 5 6 7 8
95 10322
16 OPin- 15 VS 14 FMout 13 VRef 12 Discr 11 GND1 10 SWout 9 IFin
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Symbol OPin+ OPout RCwake GND2 Compout RC- RC+ AMout IFin SWout GND1 Discr VRef FMout VS OPin-
Function OP amplifier non-inverted input OP amplifier output RC wake-up reset time Ground of the logical circuits Inverting comparator output Comparator time constant Comparator time constant AM current output IF input Wake-up output Ground of the analog circuits FM discriminator tank Reference voltage FM discriminator output Supply voltage OP amplifier inverted input
Internal connections see figures 4 to 19
Figure 2. Pin description
Absolute Maximum Ratings
Parameters Supply voltage Power dissipation Tamb = 85C Junction temperature Ambient temperature Storage temperature Symbol VS Ptot Tj Tamb Tstg Value 13 400 125 -40 to +85 -55 to +125 Unit V mW C C C
Thermal Resistance
Junction ambient Parameters DIP16 SO16L Symbol RthJA RthJA Value 120 100 Unit K/W K/W
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U4313B
Electrical Characteristics
VS = 5 V, Tamb = 25C, fin = 10.7 MHz; FM part: fmod = 1 kHz, fdev = 22.5 kHz; AM part:, fmod = 1 kHz, m = 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 suppression IF amplifier Input resistance Input capacitance Typical internal 3 dB frequency -3 dB limiting point Recovered data voltage FM detector output resistance AM rejection ratio Maximum AM input voltage AM quiescent current Maximum AM 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 Pin 15 Pin 15 Pin 15 Pin 13 Pin 13 Pin 13 Pin 13 Pin 13 Symbol VS Iq Iact Vref Iref RRef Cref psrr Rin Cin f3dB VFM3dB VFMout RFMout AMrr VAMmax IAMout IAMoutmax ft 10 Min. 3 1 2.8 2.3 2.4 2.3 10 60 180 8 30 130 50 25 90 22 100 4 80 70 1.55 37 330 5 520 12 Typ. Max. 12 1.3 3.6 2.5 5 5 Unit V mA mA V mA
W mF W
f = 50 Hz
dB
Pin 9 Pin 9 IF level 70 dBmV Pins 9 and 14 Pin 9 Pin 14 Pin 14 m = 30% Pins 9 and 14 Pin 9 Pin 8 Pin 8 Pins 1, 2 and 16 Pins 1, 2 and 16 Pins 1, 2 and 16 Pin 2 Pins 1 and 16 Pins 1 and 16 Pin 2 Pins 1 and 16 Vin < 300 mV, f = 33 kHz, unity gain circuit Pin 2 f = 50 Hz Pin 2
pF MHz dBmV mV kW dB dBmV
50
230
mA mA
MHz degree dB V V mV mA dB % dB
d
3 50 0.7 -2.5 65
6.5 95 1.7
g0 Vout Vin Vos Iout cmrr thd psrr
0 85 1
+2.5 5
3
65
85
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U4313B
Parameters Clamping comparator Typical common-mode input voltage range Maximum distortion voltage Test Conditions / Pins Pin 2 Vsignal = 100 mV, R+ = R- = 50 kW, C+ = C- = 200 nF, fdisto = 50 Hz, Pin 2 fsignal = 1 kHz V2 > (V6 + V7) /2 (10-kW load to VRef) Pin 5 V2 < (V6 + V7) /2 (10-kW load to VRef) Pin 5 Pin 9 Pin 3 Pin 3 Pin 10 Pin 10 Pins 3 and 13 Pins 3 and 13 Symbol Vcmvr Vdmax Min. 0.8 Typ. Max. 1.6 200 Unit V mV
Output voltage
Vcout
0
150
250
mV 1)
Output voltage
Vcout
VRef
Wake-up circuit Minimum wake-up level Internal charging resistor Threshold voltage Output switch current Output switch voltage External wake-up resistor External wake-up capacitor Hold time ( 30%) Delay time ( 30%)
1) 2) 3) 4)
Vin Rint Vth ISW VSW RWU CWU th td
180 22
40 1.5 1.6 250
dBmV 2) kW V 550 5.5 10 V3) kW s 4) s 4)
mA mF
1.5 RWU CWU CWU 0.75 kW
IC version with non-inverting comparator available: U4311B Measured at Pin 9, referred to 330 W Protected by a Z-diode, see figure 13 Valid for 0.1 mF CWU 10 mF and 22 kW RWU 680 kW
Application
The U4313B is well-suited to implement UHF remote control or data transmission systems based on a lowcurrent superheterodyne receiver concept. SAW devices may be used in the transmitter's as well as in the receiver local oscillator. The front end should be a discrete circuit application with low-current UHF transistors such as S822T or S852T. The frequency of the local oscillator can be determined either by coaxial resonators or SAW devices. Due to large SAW-resonator tolerance, an IF
bandwidth and in a FM system additionally the discriminator amplitude characteristic (figure 28) of 300 kHz or higher is proposed. As the circuit needs only 3.0 V supply voltage for operation, the front end may be a stacked design in order to achieve a total receiver current consumption of approximately 1 mA. Figure 29 shows a principle receiver concept diagram. The application notes ANT012, ANT013 and ANT015 contain more detailed information on complete RF links.
*
*
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U4313B
Circuit Description
General functions The integrated circuit U4313B includes the following functions: IF amplifier, FM demodulator, wake-up circuit with monoflop, operational amplifier, inverting data comparator and voltage regulator. The 10.7-MHz IF signal from the front end passes the integrated IF amplifier which operates for amplitude- or frequency-modulated signals to either a logarithmic AM demodulator which was implemented to avoid settlingtime problems using an automatic gain control system or a quadrature detector for FM. A data shaping filter advantageously realized with the internal high-performance operational amplifier reduces system bandwidth to an optimized compromise regarding transmission distance and data recognition. Thus, an optimal bit-error rate can be achieved without any further active component. Pin 10 and can be used to wake up a microcontroller. After an adjustable reset time, determined by the monoflop time constant, the integrated circuit returns to sleep mode. In this case, typically 1-mA supply current is required. An external resistor matched at Pin 3 to ground blocks the wake-up circuit and enables complete function at lower IF levels as can be seen in figures 24 and 27, but supply current increases up to typically 2.8 mA. Function of the clamping comparator The output signal of the operational amplifier is fed to the input of the inverting comparator and two peak detectors (Q1 and Q2, figure 3). Their time constants are distinguished by RC+ and RC-. The component's value must be adapted to the transmission code. The time constant should be large compared to the bit rate for optimized noise and hum suppression. To compensate the input transistors base-emitter-voltage differences, these two signals are buffered by Q3 and Q4. The mean value is used as comparator threshold, the difference of the peak values controls the hysteresis. This clamping comparator operates as a data regenerator. Another version of the IC, with a non-inverting clamping comparator, is also available (U4311B). Therefore the operational amplifier can be used either as a noninverting or an inverting filter without the need of any additional components.
VRef
*
*
The comparator connected to the output of the filter has a level-dependent hysteresis and clamps its reference voltage to the signal's minimum and maximum peaks as described later. Without IF-input signal in normal mode only the IF amplifier and the AM demodulator which operates as a level-strength indicator are activated. If the level of the IF signal increases, the whole circuitry is turned on by the wake-up circuit. This signal is externally available at
* *
1
2
3
4
5
6
7
8
95 10214
Q4 Q1 Q3 Q2
Op. amp. +-
to pin 16
Figure 3. Principle function of the clamping comparator
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III III
Inverter
Hysteresis
Comparator Comp. threshold
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U4313B
Internal Pin Circuitry
95 9970
3
13 VRef
1
16
95 9972
Figure 6. Pin 3 RCwake
Figure 4. Pin 1 OPin+
4
VRef 13
95 9973
Figure 7. Pin 4 GND2
2
5
95 9971
Figure 5. Pin 2 OPout
95 9974
Figure 8. Pin 5 Compout
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U4313B
13 VRef
95 9975
13 VRef
95 10126
2 8 Figure 11. Pin 8 AMout
6 Figure 9. Pin 6 RC-
95 10127
9 7 13 VRef
2 Figure 12. Pin 9 IFin
95 10128 95 10125
Figure 10. Pin 7 RC+ 10
Figure 13. Pin 10 SWout
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U4313B
11
13
VRef
95 10129
Figure 14. Pin 11 GND1
14 12
95 10132
Figure 17. Pin 14 FMout
13
95 10130
Figure 15. Pin 12 Discr
95 10133
Figure 18. Pin 15 VS
15
VS
95 10134
VRef 13 16 1
95 10131
Figure 16. Pin 13 VRef
Figure 19. Pin 16 OPin-
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U4313B
0.005 1400 1300 Output 0.003 1100 0.002 1000 0.001 Input 0 15
95 10333
0.004 l in ( mA )
900 800 20 25 Time ( ms ) 30 35 40
Figure 20. Time domain response of 2-kHz Bessel lowpass data filter
100 100 dBmV Output current ( m A ) 80 70 dBmV 60
Data-Recovering Filter
The test circuit in figures 23 and 26 includes an example of a data-recovering filter realized with the components R1, R2, C1, C2, C3. It is of a second-order Bessel type with lowpass characteristic, a 3-dB cut-off frequency of 2 kHz and an additional highpass characteristic for suppressing dc and low-frequency ac components. Simulation of time domain and frequency response is drawn in figures 20 and 22. This filter gives a typical application of 1-kBaud Manchester code amplitude-modulated transmission.
14 16
40 20 30 dBmV 0 6 8 10
50 dBmV
12
95 10332
IF frequency ( MHz )
Figure 21. IF-frequency response
0
-10 V / V ( dB ) max
The capacitor C2 is responsible for the highpass cut-off frequency. For a correct pulse response, this highpass cutoff frequency should be as low as possible. Figure 20 shows the transient response and the influence of the dc component. The first pulses might be wrong if the highpass cut-off frequency is too low. For this reason, some burst bits must be transmitted before the real data transmission starts. On the other hand, if the cut-off frequency is too high, roof shaping of the rectangle pulses at the operational amplifier output might causes problems. The lowpass cut-off frequency and the maximum transimpedance Vout/Iin are distinguished by the further external elements. Careful design of the data filter enables optimized transmission range. For designing other filter parameters, refer to filter design handbooks/ programs or request TEMIC for support. Some proposals can be found in the application notes ANT012, ANT013 and ANT015.
-20
-30
-40 0.01
95 10334
0.1
1 Frequency ( kHz )
10
100
Figure 22. Frequency response of 2-kHz Bessel lowpass data filter
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Vout ( mV )
1200
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U4313B
C7 VS 10 mF 56 W R9 C8 C9 C10 10 nF R8
100 kW
100 nF 10 mF
300 W
IF input R10
C11 10 nF 10 9 Wake up out
16 8.2 kW R1
15
14
13
12
11
C3 C2 100 nF C1 10 nF 1.5 nF 100 kW R6 30 kW R2 100 kW 1 2 3 4 5 6 7 8
R5
C4 100 nF
R12
C12 Comparator output
100 kW 220 nF Data filter output R7 22 kW Wake up R3 220 kW R13 10 kW 100 kW C5 220 nF R4 C6 220 nF
R11 10 kW
Figure 23. AM test circuit with 2-kHz Bessel lowpass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10 0 -10 -20 -30 -40 -50 -60 -70 -80 0 20 40 60 80 100 N (high level) N (low level) AM output current ( m A ) S+N
100 90 80 70 60 50 40 30 20 10 10
95 10276
+25C +85C
-40C
25
40
55
70
85
100
95 10292
IF-input level ( dmBV )
IF-input level (dBmV )
Figure 24. Signal-to-noise ratio AM
Figure 25. AM-demodulator characteristic vs. temperature
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95 10135
U4313B
VS C7 10 mF C8 100 nF R15 22 k W R14 22 k W 10 mF C9 C10 22 pF R8 100 k W C11 10 nF Wake up out 300 Filter TOKO A119ACS-19000Z (L = 2.2 mH, C = 100 pF)
56
W W
R9
IF input R10
16 C2 100 nF 8.2 k W R1
15
14
13
12
11
10
9
1.5 nF 1 100 kW C1 10 nF 30 k W 100 k W R6 R5 C4 100 nF 2 3 4 5 6 7 8
R2
R12
C12
10 k W
R11
100 k W 220 nF R7 22 kW Data filter output Wake up R3 220 k W R13 10 k W 100 kW C5 220 nF R4 C6 220 nF Comparator output
Figure 26. FM test circuit with 2-kHz Bessel low-pass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10 0 Output voltage ( V ) -10 -20 -30 -40 -50 -60 -70 0 20 40 60 80 100 N S+N
2.5 C10 = 22 pF 2.0 1.5 1.0 0.5 0 10.3
95 10290
C10 = 47 pF
10.5
10.7
10.9
95 10136
C3
11.1
95 10291
IF-input level ( dmBV )
Frequency ( MHz )
Figure 27. Signal-to-noise ratio FM; deviation 22.5 kHz
Figure 28. FM-discriminator characteristic
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U4313B
VS 350 mA 350 mA
RF in
Data out
1 mA Signal path Power supply Figure 29. Principle diagram of a UHF remote-control receiver
95 10137
Ordering Information
Extended Type Number U4313B-A U4313B-AFL Package DIP16 SO16L Remarks
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U4313B
Package Information
Package DIP16
Dimensions in mm
20.0 max 7.82 7.42
4.8 max 6.4 max 0.5 min 3.3 1.64 1.44 Alternative 16 0.58 0.48 17.78 0.39 max 9.75 8.15
2.54
9
technical drawings according to DIN specifications
1
8
13015
Package SO16L
Dimensions in mm
10.5 10.1 9.25 8.75
2.45 2.25 0.25 0.10 1.27 8.89
2.70 2.45
0.3 0.2 7.5 7.3 10.56 10.15
0.49 0.35
technical drawings according to DIN specifications
1
95 11493
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U4313B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
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