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U4311B
Low-Current Superhet Remote Control Receiver
Description
The U4311B 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 about 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 Logarithmic AM demodulator D FM demodulator D Monoflop exit to wake up a microcontroller D High-performance operational amplifier to realize a data recovering filter D Non-inverting clamping comparator with amplitudedepending hysteresis for data regeneration
Block Diagram
Wake-up out
VS 15 VRef = 2.4V 13 Bandgap 11 Internal VRef = 2.4 V Monoflop RF Level Wake up Non - invert. clamping comparator 10 3 7 6 5 Data out
10.7 MHz 9 IF amplifier Quadrature detector Operational amplifier - 4 8 log AM out 10.7 MHz Figure 1. Block diagram 12 14 FM out Data filter 16 + 1
95 9968
2
Ordering Information
Extended Type Number U4311B-M U4311B-MFL Package DIP16 SO16L Remarks
Rev. A3, 28-Sep-00
1 (15)
U4311B
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 11 10 9 Discr GND1 SWout 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 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
Figure 2. Pin description
Internal connections see figures 4 to 19
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
2 (15)
Rev. A3, 28-Sep-00
U4311B
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 rejection ratio 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 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 ft d g0 Vout Vin Vos Iout 0.7 -2.5 0 50 3 4 80 70 1.55 1.7 +2.5 5 95 6.5 MHz degree dB V V mV mA m = 30% Pin 9 Pin 9 IF level 70 dBmV Pins 9 and 14 Pin 9 Pin 14 Pin 14 Pins 9 and 14 Pin 9 Pin 8 Pin 8 Rin Cin f3dB VFM3dB VFMout RFMout AMrr VAMmax IAMout IAMoutmax 10 50 8 30 130 50 25 90 22 100 37 230 180 330 5 12 520 W pF MHz dBmV mV kW dB dBmV mA mA f = 50 Hz Pin 13 Pin 13 Pin 13 Pin 13 Pin 13 VRef IRef RRef CRef psrr 10 60 2.3 2.3 2.4 2.5 5 5 V mA W mF dB Pin 15 Pin 15 Pin 15 VS Iq Iact 3 1 2.8 12 1.3 3.6 V mA mA Test Conditions / Pins Symbol Min. Typ. Max. Unit
Rev. A3, 28-Sep-00
3 (15)
U4311B
Parameters Common-mode rejection ratio Total harmonic distortion Test Conditions / Pins Pin 1 and 16 Vin < 300 mV, f = 33 kHz, unity gain circuit Pin 2 Symbol cmrr thd Min. 65 Typ. 85 1 3 Max. Unit dB %
4 (15)
Rev. A3, 28-Sep-00
U4311B
Electrical Characteristics (continued)
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 Power-supply rejection ratio Clamping comparator Typical common-mode input voltage range Maximum distortion voltage Pin 2 Vsignal = 100 mV, R+ = R- = 50 kW, C+ = C- = 200 nF, fdisto = 50 Hz, fsignal = 1 kHz Pin 2 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 Vcmvr Vdmax 0.8 1.6 200 V mV Test Conditions / Pins f = 50 Hz Pin 2 Symbol psrr Min. 65 Typ. 85 Max. Unit dB
Output voltage
Vcout
VRef
V
Output voltage
Vcout
0
150
250
mV
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) 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 Vin Rint Vth ISW VSW RWU CWU th td 1.5 CWU RWU 22 10 CWU 0.75 kW 180 40 1.5 1.6 250 550 5.5 dBmV 1) kW V mA V 2) kW mF s 3) s 3)
Rev. A3, 28-Sep-00
5 (15)
U4311B
Circuit Description
General Functions The integrated circuit U4311B includes the following functions: IF amplifier, FM demodulator, wake-up circuit with monoflop, operational amplifier, non-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 effected by use of an automatic gain control system or a quadrature detector for FM. A datashaping 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. 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 entire circuitry is turned on by the wake-up circuit. This signal is externally available at 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 the complete functionality 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 non-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 transistor's 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.
VRef
1
2
3
4
5
6
7
8
95 9969
Q4 Q1 Q3 Q2
Hysteresis Op. amp. +- Comp. threshold to Pin 16 Comparator
Figure 3. Principle function of the clamping comparator
6 (15)
Rev. A3, 28-Sep-00
U4311B
Internal Pin Circuitry
95 9970
4
95 9973
1
16 Figure 7. Pin 4 GND2
5
Figure 4. Pin 1 OPin+ VRef 13 Figure 8. Pin 5 Compout
95 9974
2 13 VRef
95 9971 95 9975
Figure 5. Pin 2 OPout 3 13 VRef 2
6
95 9972
Figure 6. Pin 3 RCwake
Figure 9. Pin 6 RC-
Rev. A3, 28-Sep-00
7 (15)
U4311B
7 13 VRef
95 10128
10 2
95 10125
Figure 10. Pin 7 RC+ Figure 13. Pin 10 SWout 13 VRef
11
95 10126
95 10129
Figure 14. Pin 11 GND1
8 Figure 11. Pin 8 AMout
12
95 10127
9
95 10130
Figure 12. Pin 9 IFin
Figure 15. Pin 12 Discr
8 (15)
Rev. A3, 28-Sep-00
U4311B
15 VS 15
95 10133
VRef Figure 18. Pin 15 VS 13
95 10134 95 10131
Figure 16. Pin 13 VRef
16 13 VRef
1
14
95 10132
Figure 17. Pin 14 FMout
Figure 19. Pin 16 OPin-
Rev. A3, 28-Sep-00
9 (15)
U4311B
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 can be seen in figures 20 and 22. This filter gives a typical application of a 1-kBaud Manchester-code, amplitude-modulated transmission. The capacitor C2 is responsible for the highpass cut-off frequency. In order to achieve a correct pulse response, this highpass cut-off 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, please refer to filter design handbooks/ programs or request Atmel Wireless & Microcontrollers for support.
40 20 30 dBmV 0 6 8 10
50 dBmV
12
14
16
95 10332
IF frequency ( MHz )
Figure 21. IF-frequency response
0
-10 V / V ( dB ) max
-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
10 (15)
Rev. A3, 28-Sep-00
V ( mV ) out
1200
U4311B
VS C7 10 mF C8 100 nF C9 10 mF C10 10 nF R8
100 kW
R9 56 W IF input
R10 300 W C11 10 nF 10 9
16 R1 8.2 kW
15
14
13
12
11
Wake-up out
C2 100 nF
C1 10 nF R2 30 kW
C3 1.5 nF
R6 100 kW
1
2
3
4
5 R12
6
7
8
R5 100 kW
C4 100 nF
C12 Comparator output
100 kW 220 nF Data filter output R7 22 kW Wake up R3 220 kW R13 10 kW R4 100 kW C6 220 nF
C5 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 N (high level) 40 60 80 IF-input level ( dmBV ) 100 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
95 10292
40 55 70 85 IF-input level (dBmV )
100
Figure 24. Signal-to-noise ratio AM
Figure 25. AM-demodulator characteristic vs. temperature
Rev. A3, 28-Sep-00
95 10135
11 (15)
U4311B
VS Filter C7 10 mF C8 100 nF R15 22 k W R14 22 k W C9 10 mF TOKO A119ACS-19000Z (L = 2.2 mH, C = 100 pF)
R9 56 W IF input
C10 22 pF R8 100 k W
R10 300 W C11 10 nF
16 C2 100 nF R1 8.2 k W
15
14
13
12
11
10
9
Wake-up out
C3 1.5 nF R6 100 kW C1 10 nF R2 30 k W R5 100 k W 1 2 3 4 5 R12 C4 100 nF 100 k W 220 nF Wake up R7 22 kW R4 100 kW R3 220 kW C5 220 nF R13 10 k W C6 220 nF 6 7 8
C12
R11 10 k W
Comparator output
Data filter output
Figure 26. FM test circuit with 2-kHz Bessel lowpass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10 0 S+N -20 -30 -40 -50 -60 -70 0 20 N Output voltage ( V ) -10
2.5 C10 = 22 pF 2.0 1.5 1.0 0.5 0.0 10.3
95 10290
C10 = 47 pF
95 10291
40 60 80 IF-input level ( dmBV )
100
10.5
10.7 10.9 Frequency ( MHz )
95 10136
11.1
Figure 27. Signal-to-noise ratio FM; deviation 22.5 kHz
Figure 28. FM-discriminator characteristic
12 (15)
Rev. A3, 28-Sep-00
U4311B
Application
The U4311B is well-suited to implement UHF remote control or data transmission systems, based on a low-current 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 (Vishay Telefunken). 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.
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
Rev. A3, 28-Sep-00
13 (15)
U4311B
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
14 (15)
Rev. A3, 28-Sep-00
U4311B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany 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. Atmel Germany GmbH 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. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
13.
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 Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A3, 28-Sep-00
15 (15)

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