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| U2860B-B Dual-Channel FM Sound Demodulator for TV Systems Description The U2860B-B is a dual-channel FM sound demodulator realized with Atmel Wireless & Microcontrollers' advanced bipolar process. All TV FM standards, from 4.5 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-B is suitable for TV, VCR and multimedia applications. Features D Two alignment-free PLL FM demodulators, automatic lock in on the received sound carrier frequency D Mono and dual channel application D Sound IF inputs provided for ceramic filters D Automatic mute for 2nd sound channel (squelch) D Mute function for both sound channels D 5 V supply voltage, low power consumption D Few external components 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) 94 8139 e 9 Figure 1. Block diagram Rev. A2, 08-Feb-01 1 (11) U2860B-B Ordering Information Extended Type Number U2860B-B U2860B-BFP Package DIP14 SO14 taped Remarks Circuit Description The U2860B-B 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. Audio Amplifiers 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. Limiter Amplifiers 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. Squelch Function 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. PLL FM Demodulators 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. Mute Switch Simultaneously muting of both circuits is possible by switching Pin 3 to ground. Internal Voltage Stabilizer The internal bandgap reference ensures constant performance independent of supply voltage and temperature. 2 (11) Rev. A2, 08-Feb-01 U2860B-B Pin Description Pin Vin1 1 14 Vin2 1 2 3 NC 2 13 VS 4 Vmute 3 12 GND 5 6 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) Vsque 4 U2860B 7 11 Cstab 8 NC 5 10 Rref 9 10 VAF2 6 9 C9 11 12 VAF1 7 94 8679 8 C8 13 14 Figure 2. Connection diagram Maximum Ratings Reference point Pin 12, unless otherwise specified Parameters Supply voltage Supply current Power dissipation Output currents External voltages VS = +9 V Pin 6, 7 Pin 1, 14 Pin 3, 4 Pin 6, 7, 8, 9, 10, 11 Pin 13 Pin 13 Symbol VS IS P Iout Vext Vext Vext Tj Tstg VESD 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 Junction temperature Storage temperature Electrostatic handling *) all pins *) Machine model in accordance with ESD S5.2 standard Rev. A2, 08-Feb-01 3 (11) U2860B-B Operating Range Parameters Supply voltage range Ambient temperature Pin 13 Symbol VS Tamb Value 4.5 to 9.0 0 to +85 Unit V C Thermal Resistance Parameters Junction ambient when soldered to PCB Symbol RthJA Value 90 Unit K/W Electrical Characteristics VS = 5 V, Tamb = 25_C, reference point Pin 12, unless otherwise specified Parameters DC-supply Supply voltage range Supply current Intercarrier input 1 DC input voltage Input resistance Input limiting voltage See note 1 Input signal vin: f = 5.5 MHz output signal AF1: vAF1 -3 dB Pin 14 VDC See note 1 Input signal vin: f = 5.74 MHz output signal AF2: vAF2 -3 dB Audio output AF2 active Rin vlim 1.75 680 750 150 V W mV Pin 1 VDC Rin vlim 1.75 680 750 150 V W mV Test Conditions / Pins Pin 13 VS IS 4.5 5.0 27 9.0 33 V mA Symbol Min. Typ. Max. Unit Intercarrier input 2 DC input voltage Input resistance Input limiting voltage 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 T = 55C Pin 10 fVCO fVCO fVCO fadj Rref 1 15 22 30 5.5 500 MHz kHz 4.5 V < VS < 5.5 V 200 kHz By external resistor Rref at Pin 10 MHz kW 4 (11) Rev. A2, 08-Feb-01 U2860B-B Electrical Characteristics (continued) VS = 5 V, Tamb = 25_C, reference point Pin 12, unless otherwise specified Parameters 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 AC output peak current AF output voltage, RMS value vin = 10 mV, f = 5.5 MHz, FM-dev. = 27 kHz, fmod = 1 kHz See note 1 VDC IDC Rout iAC vAF 500 2.2 1.0 150 1.0 -1.3 V mA W mA mV Test Conditions / Pins Pin 10 S fcap fhold 1.4 2.0 200 1.9 3.0 kHz/kW MHz MHz Resistor Rref at Pin 10 Symbol Min. Typ. Max. Unit FM demodulators, internal VCO's Difference between the output signals Total harmonic distortion 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 Pin 3 AF outputs active AF outputs not active Pin 4 vAF THD 0.1 1 0.5 dB % AM suppression aAM 46 66 dB Crosstalk attenuation between the AF outputs Supply voltage ripple rejection Mute switch Control voltage - muteoff - mute on Control current Squelch function Control voltage for automatic mute-2nd carrier "off" automatic mute-2nd carrier "on" Control current Notes 1.) aatt RR 70 24 dB dB Vmute Imute 2.0 0 150 VS 0.8 V V mA Vsque 0 2.0 0.8 VS 150 V V mA Isque This parameter is given as an application information and not measured during final testing. Rev. A2, 08-Feb-01 5 (11) U2860B-B 94 8140 +5 V 22 mF 22 nF Cstab 22 nF 10 mF 12 11 10 SIF 2 50W 14 13 *) 2.2 mF 2.2 mF 9 8 U2860B-B 1 22 nF SIF 1 50 W Mute Squelch 2 3 4 5 3.3 kW 6 7 3.3 k W 15 nF AF 2 15 nF AF 1 Figure 3. Test circuit 94 8498 +5 V 22 mF SFE 5.74 MC 10 mF 22 nF 680W 14 13 12 11 2.2 mF 10 9 8 *) 2.2 k W 1 kW 2.2 mF SIF U2860B-B 680 W 1 2 3 4 5 3.3 kW 6 7 3.3 kW SFE 5.5 MC SFE 6.0 MC Mute Squelch 15 nF AF 2 15 nF AF 1 Figure 4. Application circuit 6 (11) Rev. A2, 08-Feb-01 U2860B-B 95 10708 Figure 5. PCB layout (test/application circuit) 95 10709 95 10710 Figure 6. Component layout (test circuit) Figure 7. Component layout (application circuit) Rev. A2, 08-Feb-01 7 (11) U2860B-B 0.5 0.4 0.3 0.2 0.1 0.0 1 95 10705 3.0 input level = VCO control voltage (U8)/ V 2.5 caption hold THD/ % 2.0 1.5 1.0 2 3 4 5 6 7 8 9 95 10702 1 2 3 4 5 6 7 8 9 Frequency/ MHz Frequency/ MHz Figure 8. Total harmonic distortion 0 -10 AM suppression/ dB AF output level/ dB -20 -30 -40 -50 -60 -70 -80 30 95 10703 Figure 11. Capture and hold range 2 -2 -6 -10 -14 f = 5.5 MHz, FM-dev = +/-50 kHz, fmod = 1 kHz, 50 ms de-emphasis -18 40 50 60 70 80 90 100 110 120 IF input level/ dBmV 26 95 10704 28 30 32 34 36 38 40 IF input level/ dBmV 42 44 Figure 9. AM suppression 120 100 (S+N)/ N [dB] 80 60 40 20 0 2 95 10707 Figure 12. Limiter characteristics -50 -55 -60 -65 -70 -75 -80 8 9 95 10706 umin/ mV Pin 10 open R 10 = 15 K R 10 = 30 K 3 4 5 6 7 Frequency/ MHz 2 4 6 Frequency/ MHz 8 Figure 10. VCO free-running frequency Figure 13. Signal to noise ratio 8 (11) Rev. A2, 08-Feb-01 U2860B-B 8,9 1,14 600 W 1.75 V 2.5 k W 94 8587 600 W 9510607 Figure 14. SIF inputs Figure 17. Decoupling capacitor 3.5 V 3.5 V 11.5 kW 20 k W 3,4 2 kW 10 22 kW 94 8588 94 8591 Figure 15. Mute switch/squelch switch Figure 18. VCO offset (reference resistor) 11 6,7 100 W 3.5 V 94 8592 1.0 mA 95 10612 Figure 16. Audio outputs Figure 19. Internal supply voltage stabilization Rev. A2, 08-Feb-01 9 (11) U2860B-B Package Information Package DIP14 Dimensions in mm 20.0 max 7.77 7.47 4.8 max 6.4 max 0.5 min 3.3 1.64 1.44 0.58 0.48 15.24 14 8 0.36 max 9.8 8.2 2.54 technical drawings according to DIN specifications 13020 1 7 Package SO14 Dimensions in mm 5.2 4.8 8.75 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 13035 1 7 10 (11) Rev. A2, 08-Feb-01 U2860B-B 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. 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. A2, 08-Feb-01 11 (11) |
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