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U4311B-FS
Low-Current Superhet Remote Control Receiver
Description
The U4311B-FS is a monolithic integrated circuit in bipolar technology for low-current UHF remote control super-heterodyne 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 output 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 19 VRef = 2.4V 17 Bandgap 15 Internal VRef = 2.4 V Monoflop RF Level Wake up Non - invert. clamping comparator 13 3 9 7 6 Data out
10.7 MHz 12 IF amplifier Quadrature detector Operational amplifier - 5 11 16 18 FM out Data filter 20 + 1
12648
2
log AM out 10.7 MHz
Figure 1. Block diagram
Ordering Information
Extended Type Number U4311B-MFSG3 Package SSO20 Remarks Ambient temperature up to +105C
Rev. A3, 28-Sep-00
1 (13)
U4311B-FS
Pin Description
OPin+ 1 OPout 2 20 OPin- Pin 1 2 3 RCwake 3 n.c. 4 18 FMout 17 VRef 16 Discr 15 GND1 14 n.c. 13 SWout 12 IFin 11 AMout
12649
Symbol OPin+ OPout RCwake n.c. GND2 Compout RC- n.c. RC+ n.c. AMout IFin SWout n.c. GND1 Discr VRef FMout VS OPin-
Function OP amplifier non-inverted input OP amplifier output RC wake-up reset time Not connected Ground of the logical circuits Comparator output Comparator time constant Not connected Comparator time constant Not connected AM current output IF input Wake-up output Not connected Ground of the analog circuits FM discriminator tank Reference voltage FM discriminator output Supply voltage OP amplifier inverted input
19 VS
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
GND2 5 Compout 6 RC- n.c. RC+ 7 8 9
n.c. 10
Figure 2. Pinning
Internal connections see figures 4 to 19
Absolute Maximum Ratings
Parameters Supply voltage Power dissipation Storage temperature Ambient temperature for SSO20 Tamb = 85C Junction temperature Symbol VS Ptot Tj Tstg Tamb Value 13 400 125 -55 to +125 -40 to +105 Unit V mW C C C
Thermal Resistance
Parameters Junction ambient SSO20 Symbol RthJA Value 140 Unit K/W
2 (13)
Rev. A3, 28-Sep-00
U4311B-FS
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 Common-mode rejection ratio Total harmonic distortion Pins 1, 2 and 20 Pins 1, 2 and 20 Pins 1, 2 and 20 Pin 2 Pins 1 and 20 Pins 1 and 20 Pin 2 Pin 1 and 20 Vin < 300 mV, f = 33 kHz, unity gain circuit Pin 2 ft d g0 Vout Vin Vos Iout cmrr thd 65 85 1 3 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 dB % m = 30% Pin 12 Pin 12 IF level 70 dBmV Pins 12 and 18 Pin 12 Pin 18 Pin 18 Pins 12 and 18 Pin 12 Pin 11 Pin 11 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 17 Pin 17 Pin 17 Pin 17 Pin 17 VRef IRef RRef CRef psrr 10 60 2.3 2.3 2.4 2.5 5 5 V mA W mF dB Pin 19 Pin 19 Pin 19 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 (13)
U4311B-FS
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 > (V7 + V9) /2 (10-kW load to VRef) Pin 6 V2 < (V7 + V9 ) /2 (10-kW load to VRef) Pin 6 Pin 12 Pin 3 Pin 3 Pin 13 Pin 13 Pins 3 and 17 Pins 3 and 17 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, (12) 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)
4 (13)
Rev. A3, 28-Sep-00
U4311B-FS
Circuit Description
General Functions
The integrated circuit U4311B-FS 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 13 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 functionally at lower IF level 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
9
10
12650
Q4 Q1 Q3 Q2
Hysteresis Op. amp. +- Comp. threshold to Pin 20 Comparator
Figure 3. Principle function of the clamping comparator
Rev. A3, 28-Sep-00
5 (13)
U4311B-FS
Internal Pin Circuitry
1251
5
12654
1
20 Figure 7. Pin 5 GND2
6
Figure 4. Pin 1 OPin+ VRef 17 Figure 8. Pin 6 Compout
12655
2 17 VRef
12652 12656
Figure 5. Pin 2 OPout 3 17 VRef 2
7
12653
Figure 6. Pin 3 RCwake
Figure 9. Pin 7 RC-
6 (13)
Rev. A3, 28-Sep-00
U4311B-FS
9 17 VRef
12660
13 2
12657
Figure 10. Pin 9 RC+ Figure 13. Pin 13 SWout 17 VRef
15
12658
12661
Figure 14. Pin 15 GND1
11 Figure 11. Pin 11 AMout
16
12659
12
12662
Figure 12. Pin 12 IFin
Figure 15. Pin 16 Discr
Rev. A3, 28-Sep-00
7 (13)
U4311B-FS
19 VS 19
12665
VRef 17
12666 12663
Figure 18. Pin 19 VS
Figure 16. Pin 17 VRef 20 1
17
VRef
18
12664
Figure 17. Pin 18 FMout
Figure 19. Pin 20 OPin-
8 (13)
Rev. A3, 28-Sep-00
U4311B-FS
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.
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. in order to 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 cause 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.
-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
Rev. A3, 28-Sep-00
V ( mV ) out
1200
9 (13)
U4311B-FS
VS C7 10 mF C8 100 nF C9 10 mF C10 10 nF R8 100 kW 20 R1 8.2 kW
12667
R9 56 W R10 300 W C11 10 nF 13 12 11 IF input
Wake-up out
19
18
17
16
15
14
C2 100 nF
C1 10 nF R2 30 kW
C3 1.5 nF
R6 100 kW R5 100 kW
1
2
3
4
5
6 R12
7 C12
8
9
10
C4 100 nF
100 kW 220 nF Data filter output R7 22 kW Wake up R3 220 kW C5 220 nF R13 10 kW R4 100 kW C6 220 nF
Comparator output
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
10 (13)
Rev. A3, 28-Sep-00
U4311B-FS
VS Filter C7 10 mF C8 100 nF C9 10 mF TOKO A119ACS-19000Z (L = 2.2 mH, C = 100 pF) R9 56 W C10 22 pF R8 100 kW R10 300 W C11 10 nF IF input
R15 22 kW
R14 22 kW
Wake-up out
20 C2 100 nF R1 8.2 kW
19
18
17
16
15
14
13
12
11 R11 10 kW
C3 1.5 nF
R6 100 kW R5 100 kW
1
2
3
4
5
6 R12
7 C12
8
9
10
C1 10 nF
R2 30 kW
C4 100 nF
100 kW 220 nF Wake up R7 22 k W R3 220 kW R13 10 kW R4 100 k W Comparator output C5 220 nF C6 220 nF
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 )
12668
11.1
Figure 27. Signal-to-noise ratio FM; deviation 22.5 kHz
Figure 28. FM-discriminator characteristic
Rev. A3, 28-Sep-00
11 (13)
U4311B-FS
Application
The U4311B-FS 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 (Vishay Telefunken). The frequency of the local oscillator can be determined either by coaxial resonators or SAW devices. Due to the large
VS 350 mA 350 mA
SAW-resonator, tolerance an IF bandwidth * and in a FM system additionally the discriminator amplitude characteristic (see 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.
RF in
Data out
1 mA Signal path Power supply Figure 29. Principle diagram of a UHF remote control receiver
95 10137
Package Information
Package SSO20
Dimensions in mm
6.75 6.50 5.7 5.3 4.5 4.3
1.30 0.25 0.65 5.85 20 11 0.15 0.05 0.15 6.6 6.3
technical drawings according to DIN specifications 13007
1
10
12 (13)
Rev. A3, 28-Sep-00
U4311B-FS
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.
9.
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
13 (13)

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