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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 = +25C), PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6W Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 to +80C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75C/W Recommended Operating Characteristics: (All voltages with reference to Pin5)
Parameter Operating Supply Voltage Symbol VCC Test Conditions Min 7.0 Typ 8.5 Max 16.0 Unit V
DC Electrical Characteristics: (VCC = 8.5V, TA = +25C unless otherwise specified)
Parameter Current Consumption (Without LED Driver) Power Dissipation Voltages on Pin15 Voltages on Pin16, Pin12 DC Current Pin14 DC Current Pin2 Output Current Pin3 Switch "VCO OFF" Voltage (Pin7) Current (Pin7) Symbol ITOT PD V15-5 V16-5, V12-5 -I14 -I2 -I3 V7 I7 Test Conditions Min - - - - 195 195 - - - Typ 15 125 2.0 3.5 275 275 - 2.2 - Max - - - - 390 390 20 - 50 Unit mA mW V V A A mA V A
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 = +25C)
Parameter Gain Input Amplifier Input Impedance (External) Maximum Input Voltage Gain Output Buffers Maximum Output Voltage Output Impedance Maximim Load Impedance 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 VOUT/VIN V12 = V16 THD VOUT = 1.2VRMS, Note 1 VOUT 12, 16 THD = 1% VOUT 12 VOUT 16 S/N L = 1, R = 0 Bandwidth 20Hz to 16kHz Bandwidth DINA 10 1.1 - - - 26 - - 11 1.25 - - 0.2 40 76 82 12 - 0.5 TBD 1.0 - - - dB V % V dB dB dB dB Symbol AV ZI VI AV VO12, 16 ZO ZL muting THD 1% Pin12, Pin16 Test Conditions Min - - - - - - 5.0 - - Typ - 47 - 10 - - - 90 90 Max 20 - - TBD 500 - - - Unit dB k dB V0 k dB dB
TBD VP-P
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 = +25C)
Parameter SDS Control 10dB Channel Separation Full Stereo Full Mono For Switching to Stereo For Switching to Mono Hysteresis Pilot Signal Subcarrier V4 V4 V4 VI VI VI 19 38 57 228 Intermodulation 2 3 Traffic Radio (VWF) Suppression SCA (Subsidary Communications Authorization) 57 (VWF) 67 f = 19kHz, R6-5 = 180k, Note 2 f = 38kHz f = 57kHz f = 228kHz fM = 10kHz, spurious signal, fS = 1kHz, Note 4 fM = 13kHz, spurious signal, fS = 1kHz, Note 4 f = 57kHz, Note 5 f = 67kHz, Note 6 Channel Separation 26dB Channel Separation 1dB - - - - 4 - 32 - - - - - - - 1.0 1.2 0.8 14 - 4 40 45 50 75 50 50 80 70 - - - 20 - - - - - - - - - - V V V mV mV mV dB dB dB dB dB dB dB dB Symbol Test Conditions Min Typ Max Unit
Stereo/Mono Switch (R6 - 5 = 180k, Note 2)
Carrier and Harmonic Suppression at the Output (Note 3)
Note 2. Also adjustable. Note 3. Reference output voltage at 1kHz (measured channel R (Pin2)). Note 4. Intermodulation suppression (BFC: Beat-Frequency Components): 2 = 3 = VO (signal) at 1kHz : fS = (2 x 10kHz) - 19kHz VO (spurious) at 1kHz 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 67 = fS = (2 x 38kHz) - 67kHz VO (spurious) at 9kHz 57 (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 = +25C)
Parameter ACI (Adjacent Channel Interference) Ripple Rejection Symbol 114 190 RR100 Test Conditions f = 114kHz, Note 7 f = 190kHz, Note 7 f = 100Hz, VRIPPLE = 100mV V9 = 8.5V V9 = 7.0V Min - - - - - VPILOT = 32mV - - - 2.0 25 - - 25 2.0 - Typ 90 60 46 TBD 228 4 +200 - - 10 - - 10 - - Max - - - - - - - 0.8 8.0 - TBD 0.8 - 8.0 TBD Unit dB dB dB dB kHz % ppm/C V V A A V A V A Carrier and Harmonic Suppression at the Output (Cont'd) (Note 3)
VCO (Voltage-Controlled Oscillator) Oscillator Frequency Adjustable with R8 Capture Range (Deviation from 228kHz Center Frequency) Temperature Drift (Uncompensated) Muting Circuit (Pin11) Input Voltage (Mute "ON") Input Voltage (Mute "OFF") Input Current (Mute "ON") Input Current (Mute "OFF") Cassette-to-Radio Radio-to-Cassette VDlow VDhigh -IDlow IDhigh VClow -IClow VChigh IChigh fOSC f/f TC
Source Selector (Pin10) Switching Level
Note 3. Reference output voltage at 1kHz (measured channel R (Pin2)). Note 7. ACI (Adjacent Channel Interference): VO (signal) at 1kHz 114 = : 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). 190 =
Pin Connection Diagram
Cassette Input (R) Stereo DEC Output LED Driver SDS Control GND Pilot Cancel/ Level Control VCOOFF OSC
1 2 3 4 5 6 7 8
16 (R) Output 15 MUX Input 14 (L) Stereo DEC Output 13 Cassette Input 12 (L) Output 11 Mute 10 Radio/Cassette Switch 9 VCC
16
9
1
8
.870 (22.0) Max
.260 (6.6) Max .200 (5.08) Max
.100 (2.54) .700 (17.78)
.099 (2.5) Min

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