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参数资料
| 型号： | TDA3853T-T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 接收器 |
| 英文描述： | AM, VIDEO DISCRIMINATOR, PDSO20 |
| 文件页数： | 2/18页 |
| 文件大小： | 152K |
| 代理商： | TDA3853T-T |
January 1992
10
Philips Semiconductors
Preliminary specication
TV IF amplier and demodulator with
TV-identication
TDA3853T
Notes to the characteristics
1. Video signal is still gain controlled with 2 V (p-p) on output; but intermodulation figures are lowered.
2. AFT characteristic depends on Q-factor.
3. Ripple rejection for f = 50 to 100 Hz.
4. The 7 dB buffer gain accounts for 1 dB loss in the sound trap. Buffer output signal is typical 2 V (p-p).
When no sound trap is applied, a 330
resistor must be connected from output to input (from pin 14 to pin 13).
5. S/N is the ratio of the black-to-white amplitude (pin 12) and the RMS value of noise (black, pin 12). B = 5 MHz
weighted in accordance with CCIR-567 at a source impedance of 50
.
6.
α1.1 = 20 log (Vo at 4.4 MHz / Vo at 1.1 MHz) + 3.6 dB; α1.1 value at 1.1 MHz related to black/white signal.
α3.3 = 20 log (Vo at 4.4 MHz / Vo at 3.3 MHz); α3.3 value at 3.3 MHz related to colour carrier.
7. The carrier-to-noise ratio at IF input for “TV identified” is defined as the ratio of carrier (top sync, RMS value) and
noise (RMS value). Conditions: 5 MHz bandwidth; ViIF = 10 mV RMS (top sync) and a video signal of
2T
+ 20T + white bar.
8. A current source output is provided to match the AFT output signal to the different tuning systems. The internal
90 degrees phase shifter is matched for fo = 38.9 MHz.
9. The AFT characteristic depends on QL of the resonance circuit (QL = 60, without notch components).
10.
±4° corresponds to ±23 kHz for QL as in Fig.1 (refer to note 9).
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