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PDF NTE7018 Data sheet ( Hoja de datos )
| Número de pieza | NTE7018 | |
| Descripción | Integrated Circuit Small-Signal Subsystem for Color TV | |
| Fabricantes | NTE Electronics | |
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NTE7018
Integrated Circuit
Small–Signal Subsystem for Color TV
Description:
The NTE7018 is a TV subsystem circuit intended to be used for base–band demodulation applica-
tions. This circuit consists of all small–signal functions (except the tuner) required for a quality color
television receiver. The only additional circuits needed to complete a receiver are a tuner, the deflec-
tion output stages, and a color decoder. The NTE1567 NTSC color decoder, and the NTE1754 verti-
cal output, are ideal complements for the NTE7018.
Features:
D Vision IF amplifier with synchronous demodulation
D Tuner AGC (negative–going control voltage with increasing signal)
D AGC detector for negative modulation
D AFC circuit
D Video preamplifier
D Sound IF amplifier, demodulator, and preamplifier
D DC volume control
D Horizontal synchronization circuit with two control loops
D Extra time constant switches in the horizontal phase detector
D Vertical synchronization (divider system) and sawtooth generator with automatic amplitude
adjustment for 50 or 60HZ
D Three level sandcastle pulse
Applications:
D Color television receiver
D CATV converters
D Base–band processing
Absolute Maximum Ratings:
Supply Voltage (Pin7), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V
Total Power Dissipation, PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3W
Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +65°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
1 page  
DC and AC Electrical Characteristics (Cont’d): (VCC = V7–6 = 12V, TA = +25°C, unless otherwise
specified)
Parameter
Symbol Min Typ Max Unit
Vertical Output (Pin3)
Output Current
Maximum Output Voltage
Feedback Input (Pin4)
I3
V3–6
––
– 5.7
7
–
mA
V
Input Voltage (DC Component)
(AC Component (peak–to–peak value))
Input Current
Internal Precorrection to Sawtooth
Deviation Amplitude 50/60HZ
Vertical Guard (Note 12)
V4–6
V4–6(P–P)
–
–
3.3
1.2
–
–
I4
––
12
∆tp – 5 –
–0
2
V
µA
%
%
Active at a Deviation with Respect to the DC Feedback Level,
(V27–6 = 2.5V),
(at Switching Level Low)
(at Switching Level High)
∆V4–6
– 1.3
– 1.9
–
–
V
Note
1. Pin11 has a double function. When during switch–on a current of 6mA is supplied to this pin, this current is used
to start the horizontal oscillator. The main supply can then be obtained from the horizontal deflection stage.
When no current is supplied to this pin it can be used as volume control. The indicated maximum value is the
current at which all IC’s will start. Higher currents are allowed: the excess current is bypassed to GND.
Note 2. Signal with negative–going sync top white 10% of the top sync amplitude.
Note 3. The differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and
smallest value relative to the subcarrier amplitude at blanking level. The differential phase is defined as the
difference in degrees between the largest and smallest phase angle.
Note
Note
Note
Note
4. This figure is valid for the complete video signal amplitude (peak white to black).
5. The S/N = 20 log VOUT BLACK–TO–WHITE
VN(RMS) at B = 5MHZ
6. The AFC control voltage is obtained by multiplying the IF–output signal (which is also used to drive the synchro-
nous demodulator) with a reference carrier. This reference carrier is obtained from the demodulator tuned cir-
cuit via a 90° phase shift network. The IF–output signal has an asymmetrical frequency spectrum with respect
to the carrier frequency. To avoid problems due to this asymmetrical signal, the AFC circuit is gated by means
of an internally generated gating pulse. As a result the detector is operative only during black level at a constant
carrier amplitude which contains no additional side bands. As a result the AFC output voltage contains no video
information.
At very weak input signals, the driver signal for the AFC circuit will contain a lot of noise. This noise signal has
again an asymmetrical frequency spectrum and this will cause an offset of the AFC output voltage. To avoid
problems due to this effect, the AFC is switched off when the AGC is controlled to maximum gain.
The measured figures are obtained at an input sign RMS voltage of 10mV and the AFC output loaded with 2
times 220kΩ between +VS and GND. The unloaded Q–factor of the reference tuned circuit is 70. The AFC
is switched off when no signal is detected by the coincidence detector or when the voltage at Pin22 is between
1.2V and 6.4V. This can be realized by a resistor of 68kΩ connected between Pin22 and GND.
7. The slicing level can be varied by changing the value of R17–25. A higher resistor value results in a larger value
of the minimum sync pulse amplitude. The slicing level is independent of the video information.
Note
8. Frequency control is obtained by supplying a correction current to the oscillator RC–network via a resistor, con-
nected between the phase 1 detector output and the oscillator network. The oscillator can be adjusted to the
right frequency in one of the two following ways:
a) Interrupt R23–24.
b) Short circuit the sync separator bias network (Pin25) to +VCC.
To avoid the need of a VCR switch, the time constant of phase detector at strong input signal is sufficient short
to get a stable picture during VCR playback. During the vertical retrace period, the time constant is even shorter
so that the head errors of the VCR are compensated at the beginning of the scan. Only at weak signal conditions
(information derived from the AGC circuit) is the time constant increased to obtain a good noise immunity.
Note 9. The flyback input and sandcastle output have been combined on one pin. The flyback pulse is clamped to a
level of 4.5V. The minimum current to drive the second control loop is 0.1mA.
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet NTE7018.PDF ] | |
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