NTE7050 Integrated Circuit Phase Lock Loop (PLL) Stereo Decoder Description: The NTE7050 is a Phase Lock Loop (PLL) stereo decoder with cassette head amplifiers in a 16–Lead DIP type package designed especially for car radios. This device has SDS circuitry where fluctuating signal strength can cause demodulation noise and distortion. The stereo decoder is compensated for a typical IF filter with a roll–off frequency of 50kHz (2dB down at 38kHz). Features: D A Voltage–Controlled Oscillator D A Pilot Presence Detector and an Automatic Mono/Stereo Switch D A Matrix and Two Amplifiers for the Left and Right Output Signal D Two Output Buffers with 10dB Gain and Low Output Impedance D Mute Circuit D A Source Selector for Radio or Cassette D An Input Amplifier of which the Gain can be Adjusted by means of an External Input Resistor D A Pilot Cancelling Circuit for an Extra Suppression of the Pilot Signal of 15dB D An Signal Dependent Stereo (SDS) Circuit for a Smooth Change Over from Stereo to Mono at Weak Tuner Input Signals Absolute Maximum Ratings: Supply Voltage (Pin3 and Pin9), V3–5, V9–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V LED Driver (Peak Current), I3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA Total Power Dissipation (TA = +25°C), PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6W Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +80°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W Recommended Operating Characteristics: (All voltages with reference to Pin5) Parameter Operating Supply Voltage Symbol VCC Test Conditions Min Typ Max Unit 7.0 8.5 16.0 V DC Electrical Characteristics: (VCC = 8.5V, TA = +25°C unless otherwise specified) Parameter Symbol Current Consumption (Without LED Driver) Min Typ Max Unit ITOT – 15 – mA Power Dissipation PD – 125 – mW Voltages on Pin15 V15–5 – 2.0 – V V16–5, V12–5 – 3.5 – V DC Current Pin14 –I14 195 275 390 µA DC Current Pin2 –I2 195 275 390 µA Output Current Pin3 –I3 – – 20 mA Switch “VCO OFF” Voltage (Pin7) V7 – 2.2 – V Current (Pin7) I7 – – 50 µA Voltages on Pin16, Pin12 Test Conditions AF Conditions: Input MUX signal is 1VP–P = 1kHz; VPILOT = 32mV (9%), oscillator adjusted to fOSC = 228kHz at VI = 0V, unless otherwise specified. (All figures are measured with a roll–off network of 50kHz (2dB down at 38kHz) at the input. AC Electrical Characteristics: (All parameters are measured in the circuit at nominal supply voltage(VCC = 8.5V) and TA = +25°C) Parameter Symbol Test Conditions Min Typ Max Unit Gain Input Amplifier AV – – 20 dB Input Impedance (External) ZI – 47 – kΩ Maximum Input Voltage VI – – Gain Output Buffers AV – 10 – dB THD ≤ 1% – – TBD V0 Pin12, Pin16 – – 500 Ω Maximum Output Voltage VO12, 16 TBD VP–P Output Impedance ZO Maximim Load Impedance ZL 5.0 – – kΩ α muting – 90 – dB α – 90 – dB VOUT/VIN 10 11 12 dB V12 = V16 1.1 1.25 – V – – 0.5 % – – TBD V – 0.2 1.0 dB L = 1, R = 0 26 40 – dB Bandwidth 20Hz to 16kHz – 76 – dB Bandwidth DINA – 82 – dB Muting Level Source Selector Overall Performance Overall Gain (Mono) AF Output Voltage (RMS) Mono Total Harmonic Distortion Output Voltage Output Channel Unbalance Channel Separation Signal–to–Noise Ratio THD VOUT = 1.2VRMS, Note 1 VOUT 12, 16 THD = 1% VOUT 12 VOUT 16 α S/N Note 1. Guaranteed for mono, mono +pilot, stereo. AC Electrical Characteristics (Cont’d): (All parameters are measured in the circuit at nominal supply voltage(VCC = 8.5V) and TA = +25°C) Parameter Symbol Test Conditions Min Typ Max Unit SDS Control 10dB Channel Separation V4 Full Stereo V4 Full Mono V4 – 1.0 – V Channel Separation ≥ 26dB – 1.2 – V Channel Separation ≥ 1dB – 0.8 – V Stereo/Mono Switch (R6 – 5 = 180k, Note 2) For Switching to Stereo VI – 14 20 mV For Switching to Mono VI 4 – – mV Hysteresis ∆VI – 4 – mV Carrier and Harmonic Suppression at the Output (Note 3) Pilot Signal α19 f = 19kHz, R6–5 = 180kΩ, Note 2 32 40 – dB Subcarrier α38 f = 38kHz – 45 – dB α57 f = 57kHz – 50 – dB α228 f = 228kHz – 75 – dB α2 fM = 10kHz, spurious signal, fS = 1kHz, Note 4 – 50 – dB α3 fM = 13kHz, spurious signal, fS = 1kHz, Note 4 – 50 – dB Intermodulation Traffic Radio (VWF) Suppression α57 (VWF) f = 57kHz, Note 5 – 80 – dB SCA (Subsidary Communications Authorization) α67 f = 67kHz, Note 6 – 70 – dB Note 2. Also adjustable. Note 3. Reference output voltage at 1kHz (measured channel R (Pin2)). Note 4. Intermodulation suppression (BFC: Beat–Frequency Components): α2 = VO (signal) at 1kHz : fS = (2 x 10kHz) – 19kHz VO (spurious) at 1kHz α3 = VO (signal) at 1kHz : fS = (3 x 13kHz) – 38kHz VO (spurious) at 1kHz measured with: 91% mono signal; fM = 10 or 13kHz; 9% pilot signal. Note 5. Traffic ratio (VWF) suppression: VO (signal) at 1kHz VO (spurious) at 1kHz ±23Hz measured with: 91% stereo signal; fM = 1kHz; 9% pilot signal; 5% traffic subcarrier (f = 57kHz; 60% AM modulated with f mod. 23Hz). Note 6. SCA (Subsidary Communications Authorization): VO (signal) at 1kHz α67 = fS = (2 x 38kHz) – 67kHz VO (spurious) at 9kHz α57 (VWF) = measured with: 81% mono signal; fM = 1kHz; 9% pilot signal; 10% SCA–subcarrier (fS = 67kHz, unmodulated). AC Electrical Characteristics (Cont’d): (All parameters are measured in the circuit at nominal supply voltage(VCC = 8.5V) and TA = +25°C) Parameter Symbol Test Conditions Min Typ Max Unit Carrier and Harmonic Suppression at the Output (Cont’d) (Note 3) ACI (Adjacent Channel Interference) Ripple Rejection α114 f = 114kHz, Note 7 – 90 – dB α190 f = 190kHz, Note 7 – 60 – dB V9 = 8.5V – 46 – dB V9 = 7.0V – TBD – dB – 228 – kHz – 4 – % RR100 f = 100Hz, VRIPPLE = 100mV VCO (Voltage–Controlled Oscillator) Oscillator Frequency Adjustable with R8 fOSC Capture Range (Deviation from 228kHz Center Frequency) ∆f/f Temperature Drift (Uncompensated) TC – +200 – ppm/°C Input Voltage (Mute “ON”) VDlow – – 0.8 V Input Voltage (Mute “OFF”) VDhigh 2.0 – 8.0 V Input Current (Mute “ON”) –IDlow 25 10 – µA Input Current (Mute “OFF”) IDhigh – – TBD µA VClow – – 0.8 V –IClow 25 10 – µA VChigh 2.0 – 8.0 V IChigh – – TBD µA VPILOT = 32mV Muting Circuit (Pin11) Source Selector (Pin10) Switching Level Cassette–to–Radio Radio–to–Cassette Note 3. Reference output voltage at 1kHz (measured channel R (Pin2)). Note 7. ACI (Adjacent Channel Interference): VO (signal) at 1kHz α114 = : fS = 110kHz – (3 x 38kHz) VO (spurious) at 4kHz VO (signal) at 1kHz : fS = 186kHz – (3 x 38kHz) VO (spurious) at 4kHz measured with: 90% mono signal; fS = 1kHz; 9% pilot signal; 1% spurious signal (fS = 110 or 186kHz, unmodulated). α190 = Pin Connection Diagram Cassette Input (R) Stereo DEC Output LED Driver 1 16 (R) Output 2 15 MUX Input 3 SDS Control 4 14 (L) Stereo DEC Output 13 Cassette Input GND 5 12 (L) Output Pilot Cancel/ Level Control VCOOFF 6 11 Mute 7 10 Radio/Cassette Switch OSC 8 9 16 9 1 8 VCC .870 (22.0) Max .260 (6.6) Max .200 (5.08) Max .100 (2.54) .700 (17.78) .099 (2.5) Min