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| Features * Two Alignment-free PLL FM Demodulators, Automatic Lock-in on the Received Sound * * * * * * Carrier Frequency Mono and Dual Channel Application Sound IF Inputs Provided for Ceramic Filters Automatic Mute for Second Sound Channel (Squelch) Mute Function for Both Sound Channels 5-V Supply Voltage, Low-power Consumption Few External Components Description The U2860B-M is a dual-channel FM sound demodulator realized with Atmel 's advanced bipolar process. All TV FM standards, from 4.5 MHz up to 6.5 MHz (standard M, B/G, I, D/K) can be processed with high performance. The circuit is alignment-free and has a minimum number of external components. With 5 V supply voltage, the U2860B-M is suitable for TV, VCR and multimedia applications. Dual-Channel FM Sound Demodulator for TV Systems U2860B-M Figure 1. Block Diagram VS Cstab 13 12 Supply 11 8 7 VAF1 Vin1 1 VCO 1 Loop filter 1 Mute 3 Mute VCO offset 10 VCO offset Rref (optional) Vin2 14 VCO 1 Loop filter 2 6 VAF2 Squelch 4 Squelch Squelch (second carrier) 9 Rev. 4794A-TVVCR-02/04 Pin Configuration Figure 2. Pinning Vin1 NC Vmute Vsque NC VAF2 VAF1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vin2 VS GND Cstab Rref C9 C8 Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol Vin1 NC Vmute Vsque NC VAF2 VAF1 C8 C9 Rref Cstab GND VS Vin2 Function Intercarrier input of sound channel 1 (5.5 MHz) Not connected Mute for sound channel 1+2 "on/off" Automatic mute for 2nd sound channel (squelch) "on/off" Not connected Audio output AF2 of sound channel 2 Audio output AF1 of sound channel 1 Decoupling capacitor for sound channel 1 Decoupling capacitor for sound channel 2 VCO offset of the free-running frequency Internal supply voltage stabilization Ground Supply voltage Intercarrier input of sound channel 2 (5.74 MHz) 2 U2860B-M 4794A-TVVCR-02/04 U2860B-M Circuit Description The U2860B-M includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation. The intercarrier signals are fed through external ceramic bandpass filters to a 7-stage limiter amplifier. This guarantees high input sensitivity and excellent AM suppression. The alignment-free Phase Locked Loop (PLL) demodulator covers a wide frequency range of 4.5 MHz up to 6.5 MHz with low-noise performance. The linear voltage to frequency characteristic results in low harmonic distortion. The free-running frequency of the internal VCO circuit is about 5.5 MHz. For this frequency, the input sensitivity and VCO locking is optimal. An additional external resistor at pin 10 allows a frequency shift of 1 MHz via an internal offset current. With this option, it is possible to shift the optimum conditions to the upper frequency (6.5 MHz) or to the lower frequency (4.5 MHz). The offset current acts simultaneously on both VCO circuits. If no resistor is connected, the offset current is disabled. The demodulated signals are amplified to 500 mVrms with low output impedance at the audio outputs (pin 6 and pin 7). AC decoupling at pin 8 and pin 9 of the audio amplifiers leads to high common mode rejection. For channel 2 the audio output amplifier and VCO2 is muted automatically (squelch) when the second sound carrier is not present. This avoids a wrong identification for stereo and dual sound in the stereo decoder. Therefore, with mono sound, there is no output signal at pin 6. The automatic squelch function can be disabled by switching pin 4 to ground. Simultaneous muting of both circuits is possible by switching pin 3 to ground. The internal bandgap reference ensures constant performance independent of supply voltage and temperature. Limiter Amplifiers PLL FM Demodulators Audio Amplifiers Squelch Function Mute Switch Internal Voltage Stabilizer 3 4794A-TVVCR-02/04 Absolute Maximum Ratings Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point pin 12, unless otherwise specified. Parameters Supply voltage Supply current Power dissipation VS = +9 V Output currents External voltages Junction temperature Storage temperature Electrostatic handling Notes: (1) Pin 13 13 6, 7 1, 14 3, 4 6, 7, 8, 9, 10, 11 Symbol VS IS P Iout Vext Vext Vext Tj Tstg Value 9.0 33 300 1.5 2.0 VS 4.5 V +125 -25 to +125 200 Unit V mA mW mA V V V C C V all pins VESD 1. Machine model in accordance with ESD S5.2 standard. Thermal Resistance Parameters Junction ambient when soldering to PCB Symbol RthJA Value 90 Unit K/W Operating Range Parameters Supply voltage range, pin 13 Ambient temperature Symbol VS Tamb Value 4.5 to 9.0 0 to 85 Unit V C 4 U2860B-M 4794A-TVVCR-02/04 U2860B-M Electrical Characteristics VS = 5 V, Tamb = 25 C, reference point pin , unless otherwise specified Parameters DC Supply (Pin 13) Supply voltage range Supply current Intercarrier Input 1 (Pin 1) DC input voltage Input resistance (1) Test Conditions Pin Symbol VS IS VDC Rin Min. 4.5 Typ. 5.0 27 1.75 680 Max. 9.0 33 Unit V mA V 750 V Input limiting voltage Input signal vin: f = 5.5 MHz output signal AF1: vAF1 = -3 dB vlim 150 Intercarrier Input 2, Pin 14 DC input voltage Input resistance(1) Input signal vin: f = 5.74 MHz output signal AF2: vAF2 = -3 dB Audio output AF2 active VDC Rin vlim 1.75 680 750 V V Input limiting voltage 150 Input signal for automatic second sound carrier mute off (squelch) Free-running frequency Oscillator drift (free-running) as function of temperature Oscillator shift (free-running) as function of supply voltage Adjustment range of free-running frequencies Adjustment resistance for free-running frequencies vin > 0.7 1.0 < 1.5 mV FM Demodulators, Internal VCO's (Pin 10) fVCO T = 55 C 4.5 V < VS < 5.5 V By external resistor Rref at pin 10 fVCO fVCO fadj Rref 1 15 22 30 5.5 500 200 MHz kHz kHz MHz k FM Demodulators, Internal VCO's (Pin 10) Steepness of free-running frequency adjustment Capture range of PLL's Holding range of PLL's Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6) DC output voltage DC output current Output resistance Note: (1) Resistor Rref at pin 10 S fcap fhold VDC IDC Rout iAC 1.4 2.0 200 1.9 3.0 2.2 1.0 150 1.0 -1.3 kHz/k MHz MHz V mA mA AC output peak current 1. This parameter is given as an application information and not measured during final testing. 5 4794A-TVVCR-02/04 Electrical Characteristics (Continued) VS = 5 V, Tamb = 25 C, reference point pin , unless otherwise specified Parameters Test Conditions vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz fmod = 1 kHz Pin Symbol Min. Typ. Max. Unit AF output voltage, RMS value vAF 500 mV Difference between the output signals vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz fmod = 1 kHz vin = 10 mV f = 5.5 MHz fmod = 1 kHz reference signal: FM-dev. = 50 kHz test signal: m = 30% f = 50 Hz to 12.5 kHz VRR < 200 mV, f = 70 Hz vAF 1 dB Total harmonic distortion THD 0.1 0.5 % AM suppression AM 46 66 dB Crosstalk attenuation between the AF outputs Supply voltage ripple rejection Mute Switch (Pin 3) Control voltage - mute off - mute on Control current Squelch Function, (Pin 4) Control voltage for automatic mute 2nd carrier - off - on Control current Note: att RR 70 24 dB dB AF outputs active AF outputs not active Vmute Imute 2.0 0 150 VS 0.8 V V A Vsque Isque 0 2.0 150 0.8 VS V V A 1. This parameter is given as an application information and not measured during final testing. 6 U2860B-M 4794A-TVVCR-02/04 U2860B-M Figure 3. Total Harmonic Distortion 0.5 0.4 0.3 THD (%) 0.2 0.1 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) Figure 4. AM Suppression 0 -10 AM Suppression (dB) -20 -30 -40 -50 -60 -70 -80 30 40 50 60 70 80 90 100 110 120 IF Input Level (dBV) Figure 5. VCO Free-running Frequency 120.0 80.0 Pin 10 open umin (V) 40.0 R10 = 30k R10 = 15k 0.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) 7 4794A-TVVCR-02/04 Figure 6. Capture and Hold Range 3.0 VCO Control Voltage U8 (V) 2.5 Input level = caption 2.0 Input level = hold 1.5 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) Figure 7. Limiter Characteristics 2 AF Output Level (dB) -2 -6 -10 f = 5.5 MHz, FM-dev. = +/- 50 kHz, fmod = 1 kHz, 50 s de-emphasis -14 -18 26 28 30 32 34 36 38 40 42 44 IF Input Level (dB) Figure 8. Signal-to-noise Ratior -50 -55 -60 (S+N)/N (dB) -65 -70 -75 -80 0 2 4 6 8 10 Frequency (MHz) 8 U2860B-M 4794A-TVVCR-02/04 U2860B-M Figure 9. SIF Inputs 1,14 600 1.75 V 600 Figure 10. Mute Switch/Squelch Switch 3.5 V 20 k 2k Figure 11. Audio Outputs 6,7 100 1.0 mA 9 4794A-TVVCR-02/04 Figure 12. Decoupling Capacitor 8,9 2.5 k Figure 13. VCO Offset (Reference Resistor) 3.5 V 11.5 k 10 22 k Figure 14. Internal Supply Voltage Stabilization 11 3.5 V 10 U2860B-M 4794A-TVVCR-02/04 U2860B-M Figure 15. Test Circuit +5 V 22 mF 22 nF SIF 2 Cstab 22 nF 10 F 12 11 10 9 2.2 F 8 2.2 F 50 14 13 U2860B-M 1 22 nF SIF 1 50 Mute Squelch 2 3 4 5 3.3 k 6 7 3.3 k 15 nF AF2 15 nF AF1 Figure 16. Application Circuit +5 V 22 F SFE 5.74 MC 10 F 22 nF 680 14 13 12 11 2.2 F 10 9 8 2.2 k 1 k 2.2 F SIF U2860B-M 680 1 2 3 4 5 3.3 k 6 7 3.3 k SFE 5.5 MC SFE 6.0 MC Mute Squelch 15 nF AF2 15 nF AF1 11 4794A-TVVCR-02/04 Figure 17. PCB Layout (Test/Application Circuit) Figure 18. Component Layout (Test Circuit) Figure 19. Component Layout (Application Circuit) 12 U2860B-M 4794A-TVVCR-02/04 U2860B-M Ordering Information Extended Type Number Package Remarks U2860B-MFP U2860B-MFPG3 SO14 SO14 Tube Taped and reeled Package Information Package SO14 Dimensions in mm 8.75 5.2 4.8 3.7 1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85 technical drawings according to DIN specifications 1 7 13 4794A-TVVCR-02/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel: (33) 4-76-58-30-00 Fax: (33) 4-76-58-34-80 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel: (33) 4-42-53-60-00 Fax: (33) 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Literature Requests www.atmel.com/literature Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. (c) Atmel Corporation 2004. All rights reserved. Atmel (R) and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. 4794A-TVVCR-02/04 |
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