TDA8349A 查看數據表（PDF） - Philips Electronics
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TDA8349A Datasheet PDF : 17 Pages
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Philips Semiconductors
Multistandard IF amplifier and demodulator
Product specification
TDA8349A
Notes
1. All input signals are measured in RMS values at 100% carrier level and a frequency of 38.9 MHz.
2. On set AGC.
3. Input impedance selected so that a SAW filter can be applied without extra components.
4. Measured with 0 dB = 200 µV.
5. Measured at 10 mV(RMS) top sync input signal and the video output unloaded.
6. Projected zero point with internally switched demodulator.
7. With the AGC switch switched to ground, for the B/G standard, or with the identification capacitor switched to VCC
for the negative MAC standard.
8. With the AGC switch switched open for the L standard, or switched to VCC for the positive MAC standard.
9. Measured in accordance with the test line given in Fig.8.
- 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 phase angle of the 4.4 MHz signal at
20% and 80% luminance signal.
10. Measured in accordance with the test line shown in Fig.9.
The non-linearity is measured by comparing the differences between adjacent pairs of six luminance levels that make
up the 5 step staircase. The measurement result is the largest percentage deviation in adjacent step values. The sign
is always positive.
11. Measured with a 75 Ω source: S ⁄ N = 20 log -V----n----(-V-R---o--M--b----Sl-a---)-c--a-k----t--t-Bo-----w-=----h-5--i-t--eM-----H----z--
12. The internal circuit of pin 20 behaves as an internal voltage source of 4.5 V with an input resistance of 15 kΩ. Using
the system switch three conditions can be obtained:
Negative modulation with top sync level AGC. This is achieved with pin 20 connected to ground.
Positive modulation with white level AGC. This is achieved with pin 20 open, or connected to 5 V.
Positive modulation with top white AGC and an increased time constant for MAC signals. This is achieved with pin
20 connected to VCC.
13. Measured with a capacitor of 2.2 µF connected to pin 5. A step is made from 200 µV to 80 mV input signals.
14. Measured with a capacitor of 2.2 µF connected to pin 5. A step is made from 80 mV to 200 µV input signals.
15. It is possible to adjust the tuner AGC over the whole AGC range of the IF amplifier for both pnp and npn tuners. Tuner
AGC starting point is defined as an output current of 0.2 mA for pnp and 1.8 mA for npn, in an application with a
resistance of 6 kΩ to VP at pin 4.
16. Crosstalk is defined as: 20 log V----V-o---uo---nw---w-a----an---nt--e-t--ed---d--v---i-v-d--i-de---eo----o-b----bl-a--l-ac---k-c----k-t---o--t-o---w-----w-h---hi-t--ei--t-e-- measured at 4.4 MHz
17. The video switch is controlled by a voltage on pin 7. The switching level is approximately 1.4 V. With pin 7 open-circuit
internal video is selected; with pin 7 pulled to ground external video is selected.
18. Measurement taken with an input 10 mV(RMS). The unloaded Q factor of the reference tuned circuit is 70.
19. Switching off the AFC is obtained by a voltage of less than 2 V on pin 6. Normally this is achieved by pulling pin 6 to
ground.
20. Switching to the normal analog AFC mode can be done by pulling pin 9 to a voltage above 10.2 V. Normally this is
achieved by pulling pin 9 to VP.
The inverse analog AFC mode can only be obtained by a voltage of between 8 and 10 V applied to pin 9.
February 1991
11
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