NTE NTE7050

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