730

NTE730
Integrated Circuit
TV Video IF System
Description:
The NTE730 is a monolithic integrated circuit in a 20−Lead Quad−In−Line package that incorporates
an entire video TV−IF subsystem on a single chip. Innovations in integrated circuit design, in addition
to the many active devices and closely matched components utilized in the circuit, make the NTE730
ideally suited for use in color and black and white TV receivers.
The primary functions performed by the IF subsystem are video IF amplification, linear detection, video output amplification, AGC from a keyed supply, AGC delay for tuner, sound carrier detection,
sound carrier amplification, and a buffered AFT output. The advanced circuit design of the NTE730
also includes secondary functions for improved noise immunity and minimal airplane flutter. An isolated zener reference diode, incorporated in the IC, provides a conveninet and economical means
for controlling the regulated voltage supply. The inherent wide bandwidth capability (10−70MHz) and
high overall gain (87dB) make the NTE730 suitable for other AM IF applications whose frequencies
range within this bandwidth.
Features:
D High Gain Wide Band IF Amplifier: 75dB typ at 45MHz
D Gain Reduction with Excellent Stability: 50dB typ at 45MHz
D Video Detector with Linear Characteristics
D Video Amplifier: 12dB gain
D Impulse Noise Limiter
D Keyed AGC With Noise Immunity Circuits
D Delayed AGC for Tuner
D Buffered AFT Output
D Separate Sound IF Intercarrier Amplification
D Sound Carrier Detector
D 4.5MHz Sound Carrier Amplifier
D Isolated Zener Reference Diode For Regulated Voltage Supply
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
DC Supply Voltage:
Between Pin15 and Pin5 (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3V
Pin7 (Collector to GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Pin9 (Collector to GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
DC Current (into Pin18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Device Dissipation (TA ≤ +60°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW
Derate Linearly Above TA = +60°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7mW/°C
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
Lead Temperature (During Soldering 1/32” (0.79mm) from case, 10sec max.) . . . . . . . . . . . +265°C
Note 1. This rating does not apply when using the internal zener reference in conjunction with the
pass transistor.
Electrical Characteristics: (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Static (DC) Characteristics
Quiescent Circuit Currnet
I15
15
−
45
mA
DC Voltages
Sound (Pin2)
V2
−
6
−
V
Keying Input (Pin3)
V3
6.4
−
10
V
AGC 1 (Pin7)
V7
16
−
21
V
AGC 2 (Pin7)
V7
−
1
−
V
AGC Delay (Pin8)
V8
−
4
−
V
Cascode Collector (Pin9)
V9
−
8.5
−
V
Bias (Pin16)
V16
1.1
−
2.3
V
Zener (Pin18)
V18
10.6
11.9
13.2
V
White Level (Pin19)
V19
6
−
10
V
fO = 45.75MHz, MOD (AM) = 85%
at 400Hz; Adjust eI for 4VP−P at Pin19
40
100
200
µV
fO = 45.75MHz, eI (CW) = 10mV
0.4
0.8
1.6
V
−
15
−
mV
16
−
−
V
0.5
−
2.0
V
V5 = V17 = 0V, I18 = 1mA
Dynamic Characteristics
Video Sensitivity
eI
Sync. Tip Level Voltage
V19
AFT Drive Level Voltage
V14
Delay Bias Voltage
At eI = 10mV
V7
At eI = 30mV
fO = 45.75MHz, eI (CW) = 20mV;
Adjust R1 for V7 = 14V
3.58MHz Chroma Output Voltage
V19
fO = 45.75MHz, eI (step mod.) = 10mV;
f1 = 42.17MHz, eI (step mod.) = 3.33mV
0.5
0.8
−
V
4.5MHz Sound Output Voltage
V2
fO = 45.75MHz, eI (step mod.) = 10mV;
f2 = 41.25MHz, eI (step mod.) = 2.5mV
50
200
−
mV
fO = 45.75MHz
4
−
−
kΩ
Parallel Input Impedance
Resistance at Pin6
RI−6
Capacitance at Pin6
CI−6
−
2
−
pF
Resistance at Pin12
RI−12
−
4.5
−
kΩ
Capacitance at Pin12
CI−12
−
4
−
pF
Resistance at Pin13
RI−13
−
5
−
kΩ
Capacitance at Pin13
CI−13
−
4
−
pF
Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
30
−
−
kΩ
Parallel Output Impedance
Resistance at Pin9
RO−9
Capacitance at Pin9
CO−9
−
3
−
pF
Cascode Transfer Characteristics
Magnitude of Forward
Transadmittance
|yf|
−
50
−
mmho
Reverse Tranfer Capacitance
Cr
−
0.001
−
pF
fO = 45.75MHz
Pin Connection Diagram
GND
4.5MHz Sound Output
Keying Pulse
IF from Tuner
1
2
3
19 Video Output
18 (+) VCC Regulated
4
17 GND
GND 5
IF from Tuner 6
AGC to Tuner 7
10
16 IF Transformer
15 (+) VCC
14 To AFT
(+) VCC 8
IF Transformer 9
GND 10
13 IF Transformer
9
2
12 IF Transformer
Index Notch
1
.250
(6.35)
12
19
1.110 (28.8) Max
.200
(5.08)
Max
.100 (2.54)
.325 (8.25)
Max