U2860B-M

U2860B-M ATMEL | Alldatasheet

Document overview

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Technical content

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. Figure 1. Block Diagram

10 VCO offset

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Figure 2. Pinning

2 NC Not connected

5 NC Not connected

10 R ref VCO offset of the free-running frequency

11 C stab Internal supply voltage stabilization

12 GND Ground

4794A–TVVCR–02/04 Circuit Description The U2860B-M includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifie r. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation. 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. 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 th is option, it is possible to shift the opti- mum 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. 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. Squelch Function For channel 2 the audio output amplifier and VCO2 is muted automatically (squelch) when the second sound carrier is not presen t. 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. Mute Switch Simultaneous muting of both circuits is possible by switching pin 3 to ground. Internal Voltage Stabilizer The internal bandgap reference ensures c onstant performance independent of supply voltage and temperature.

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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 Pin Symbol Value Unit Supply voltage 13 V S 9.0 V Supply current 13 I S 33 mA Power dissipation VS = +9 V P 300 mW Output currents 6, 7 I out ±1.5 mA External voltages 1, 14 3, 4 6, 7, 8, 9, 10, 11 Vext Vext Vext 2.0 VS 4.5 V V V V Junction temperature T j +125 ° C Storage temperature T stg -25 to +125 ° C Electrostatic handling(1) all pins V ESD ±200 V Notes: 1. Machine model in accordance with ESD S5.2 standard. Thermal Resistance Parameters Symbol Value Unit Junction ambient when soldering to PCB R thJA 90 K/W Operating Range Parameters Symbol Value Unit Supply voltage range, pin 13 V S 4.5 to 9.0 V Ambient temperature T amb 0 to 85 ° C

4794A–TVVCR–02/04

Electrical Characteristics

VS = 5 V, Tamb = 25° C, reference point pin , unless otherwise specified Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit DC Supply (Pin 13) Supply voltage range V S 4.5 5.0 9.0 V Supply current I S 27 33 mA Intercarrier Input 1 (Pin 1) DC input voltage V DC 1.75 V Input resistance(1) Rin 680 750 Ω Input limiting voltage Input signal vin: f = 5.5 MHz output signal AF1: v AF1 = -3 dB vlim 150 µV Intercarrier Input 2, Pin 14 DC input voltage V DC 1.75 V Input resistance(1) Rin 680 750 Ω Input limiting voltage Input signal vin: f = 5.74 MHz output signal AF2: v AF2 = -3 dB vlim 150 µV Input signal for automatic second sound carrier mute off (squelch) Audio output AF2 active v in > 0.7 1.0 < 1.5 mV FM Demodulators, Internal VCO’s (Pin 10) Free-running frequency f VCO 5.5 MHz Oscillator drift (free-running) as function of temperature ∆T = 55° C ∆fVCO 500 kHz Oscillator shift (free-running) as function of supply voltage 4.5 V < VS < 5.5 V ∆fVCO 200 kHz Adjustment range of free-running frequencies By external resistor Rref at pin 10 ∆fadj ±1 MHz Adjustment resistance for free-running frequencies Rref 15 22 30 k Ω FM Demodulators, Internal VCO’s (Pin 10) Steepness of free-running frequency adjustment Resistor Rref at pin 10 S 200 kHz/k Ω Capture range of PLL ’s ∆fcap ±1.4 ±1.9 MHz Holding range of PLL ’s ∆fhold ±2.0 ±3.0 MHz Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6) DC output voltage V DC 2.2 V DC output current I DC 1.0 -1.3 mA Output resistance(1) Rout 150 Ω AC output peak current i AC ±1.0 mA Note: 1. This parameter is given as an application information and not measured during final testing.

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4794A–TVVCR–02/04 AF output voltage, RMS value vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz f mod = 1 kHz vAF 500 mV Difference between the output signals ∆vAF ±1 dB Total harmonic distortion vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz fmod = 1 kHz THD 0.1 0.5 % AM suppression vin = 10 mV f = 5.5 MHz fmod = 1 kHz reference signal: FM-dev. = 50 kHz test signal: m = 30% α AM 46 66 dB Crosstalk attenuation between the AF outputs f = 50 Hz to 12.5 kHz αatt 70 dB Supply voltage ripple rejection V RR < 200 mV , f = 70 Hz RR 24 dB Mute Switch (Pin 3) Control voltage - mute off - mute on AF outputs active AF outputs not active V mute 2.0 VS 0.8 V V Control current I mute 150 µA Squelch Function, (Pin 4) Control voltage for automatic mute 2nd carrier - off - on Vsque 0 2.0 0.8 VS V V Control current I sque 150 µA Electrical Characteristics (Continued) VS = 5 V, Tamb = 25° C, reference point pin , unless otherwise specified Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Note: 1. This parameter is given as an application information and not measured during final testing.

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Figure 6. Capture and Hold Range Figure 7. Limiter Characteristics Figure 8. Signal-to-noise Ratior

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Figure 12. Decoupling Capacitor Figure 13. VCO Offset (Reference Resistor) Figure 14. Internal Supply Voltage Stabilization

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Figure 17. PCB Layout (Test/Application Circuit) Figure 18. Component Layout (Test Circuit) Figure 19. Component Layout (Application Circuit)

4794A–TVVCR–02/04

Ordering Information

Package Information

Extended Type Number Package Remarks U2860B-MFP SO14 Tube U2860B-MFPG3 SO14 Taped and reeled technical drawings according to DIN specifications Dimensions in mm 0.25 0.10 8.75 0.4 1.27 7.62 1.4 5.2 4.8 3.7 3.8 6.15 5.85 0.2 14 8

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