NTE NTE1231A

NTE1231 & NTE1231A
Integrated Circuit
Complete 4 Watt TV Sound Channel
Description:
Capable of carrying out all of the functions of a TV sound channel, the NTE1231 and NTE1231A silicon monolithic integrated circuits consist of a six–stage IF amplifier/limiter, low–pass filter, differential
peak detector, DC volume control, regulated power supply, audio preamplifier, and output stage.
The audio power amplifier will deliver 4W of low–distortion audio to a 16Ω load with a supply of 24V.
When used with a 12V supply, such as is found in many portable TV sets, these devices will furnish
1.5W to an 8Ω loud speaker.
The NTE1231 is supplied in a quad in–line plastic package with a copper lead frame. This device is
designed to use the printed wiring board on which it is mounted for heat dissipation.
The NTE1231A is furnished in a 16–Lead DIP package with heat–sink contact tabs. The webbed lead
configuration (Pin4 & Pin5, Pin12 & Pin13) allows an inexpensive heat sink to be easily attached for
increased power dissipation capability and yet permits the use of a standard IC socket or printed wiring board hole layout.
Features:
D High Sensitivity
D High AM Rejection
D DC Volume Control
D High Power Output
D Low Distortion
D Wide Operating Voltage Range: 9V to 28V
D Low Quiescent Current Drain
Absolute Maximum Ratings:
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V
Repetitive Peak Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Power Dissipation, PD
Tpins = +90°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3W
TA = +70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 12V,
RL = 8Ω, Vin = 1mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Typ
Max
Unit
5.1
6.0
6.9
V
Quiesecnt Output Voltage
VOUT
Quiescent Supply Current
ICC
RX = 22kΩ, Vin = 0
–
19
33
mA
Input Limiting Threshold
VTH
RX = 0
–
40
100
µV
AM Rejection
AMR
fd = ±25kHz, m = 0.3
40
55
–
dB
POUT = 0.5W, fd = ±25kHz
50
65
–
dB
Signal–to–Noise Ratio
S + N/N
Vin = 0
Min
Recovered Audio
Vout
RX = 0
–
120
–
mV
Output Distortion
THD
POUT = 50mW
–
1.0
–
%
Output Power
POUT
THD = 2%, fd = ±25kHz
–
1.4
–
W
THD = 10%, fd = ±25kHz
–
1.5
–
W
f = 120Hz, RX = 22kΩ, RL = 4Ω
–
46
–
dB
Power Supply Rejection
PSR
Input Resistance
Rin
–
30
–
kΩ
Input Capacitance
Cin
–
5
–
pF
Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 24V,
RL = 16Ω, Vin = 1mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Vin = 0
11
12
13
V
Quiesecnt Output Voltage
VOUT
Quiescent Supply Current
ICC
RX = 22kΩ, Vin = 0
11
22
35
mA
Input Limiting Threshold
VTH
RX = 0
–
40
100
µV
AM Rejection
AMR
fd = ±25kHz, m = 0.3
40
55
–
dB
POUT = 1W, fd = ±25kHz
50
65
–
dB
Signal–to–Noise Ratio
S + N/N
Recovered Audio
Vout
RX = 0
–
120
–
mV
Output Distortion
THD
POUT = 50mW
–
0.75
–
%
Output Power
POUT
THD = 2%, fd = ±25kHz
–
3.5
–
W
THD = 10%, fd = ±25kHz
–
4.2
–
W
f = 120Hz, RX = 22kΩ, RL = 4Ω
–
46
–
dB
Power Supply Rejection
PSR
Input Resistance
Rin
–
30
–
kΩ
Input Capacitance
Cin
–
5
–
pF
Pin Connection Diagram
IF Input
1
12 DE–Emphasis
IF Decoupling
2
IF Decoupling
3
IF Input
1
16 DE–Emphasis
11 Ripple Rejection
IF Decoupling
2
15 Ripple Rejection
10 VCC
IF Decoupling
3
14 VCC
GND
4
NTE1231
GND
5
13 GND
NTE1231A
12 GND
FM Detector
4
9
AF Output
FM Detector
6
11 AF Output
FM Detector
5
8
Compensation
FM Detector
7
10 Compensation
DC Volume Control
6
7
AF Feedback
DC Volume Control
8
9
NTE1231
.247 (6.27)
12
7
1
6
.677
(17.2)
.770 (19.5) Max
.260 (6.6)
.233
(5.9)
Max
.100 (2.54)
.099 (2.5) Min
.700 (17.78)
NTE1231A
16
9
.260 (6.6) Max
1
8
.785 (19.9)
Max
.300
(7.62)
.200 (5.08)
Max
.245 (6.22)
Min
.100 (2.54)
.700 (17.7)
AF Feedback