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參數(shù)資料
| 型號： | TDA8012M-T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT-266-1, SSOP-20 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 78K |
| 代理商： | TDA8012M-T |
1996 Mar 26
7
Philips Semiconductors
Product specication
Low power PLL FM demodulator
for satellite TV receivers
TDA8012M
Notes
1. The DC supply current is defined for VCC =5V.
2. This typical value of
70 ppm/°C or 70 × 106 °C1 can be found in the reference measuring set-up shown in Fig.3.
The temperature drift may be adjusted by the temperature coefficient of the external capacitor in the tank circuit.
3. The circuit is designed for an input level of 57 dB
V. The maximum allowable input level is 61 dBV. However, for
levels other than 57 dB
V the optimum loop filter values will be different from those given for the 57 dBV input level
in the reference measuring set-up.
4. The input impedance is reduced to a resistor with a parallel reactance. The values are given at 480 MHz. In order to
reduce the radiation from the oscillator to the RF input, it is recommended to use a symmetrical drive.
5. The PLL loop gain shift and drift are given without loop filter shift and drift (non-temperature compensated external
components).
6. The capture range or lock-in range is defined as the PLL normal operating range. This value depends strongly on
the loop filter characteristics.
7. Measurements with test signals in accordance with CCIR recommendation 473-3. FM modulated signal with
DBS parameters:
a) 625 lines PAL TV system
b) 25 MHz/V modulator sensitivity
c) 1 V (p-p) video signal
d) No SAW filter is used.
8. No SAW filter is used at the input:
a) 16 MHz/V modulator sensitivity
b) 4.43 MHz sine wave colour signal [660 mV (p-p)]
c) 3.25 MHz sine wave luminance signal [700 mV (p-p)]
d) Two Wegner sound sub-carriers at 7.02 and 7.2 MHz (100 mV)
e) Intermodulation distance is defined as the distance between the luminance signal and the intermodulation
products.
9. The characteristics of the AGC function are measured in the application circuit of Fig.4. The circuit illustrated in Fig.4
has been designed to set the maximum AGC current of 1 mA. The output of the AGC function is capable of handling
up to 5 mA. The maximum AGC current can be increased to 5 mA by decreasing the value of the resistor connected
between pins 8 and 9.
10. In the application circuit (see Fig.4) the voltage at the AGC output decreases when the IF input level increases above
the adjusted AGC threshold.
11. The outputs from the AFC and carrier detector are combined at pin 19 (see Fig.3). During search tuning, when the
input frequency is outside the capture range, the combined output (carrier detector function) is at a LOW level
(any voltage below 0.6VCC). When the PLL becomes locked, the voltage at pin 19 rises to a HIGH level
(V19 = 0.8VCC to VCC). When the input channel is close to the centre frequency, V19 falls to the LOW level. As shown
in Fig.3, the voltage at pin 19 is now a function of the centre frequency (AFC function). This information may be read
by a microcontroller via the ADC of the satellite frequency synthesizer (TSA5055) and the I2C-bus.
12. The drift of the AFC voltage is measured in accordance with the following method:
a) At room temperature (Tamb =25 °C) the TDA8012M is driven by a 480 MHz unmodulated signal. The voltage at
pin 20 must be adjusted to obtain a 1.5 V output at the AFC output (pin 19).
b) At Tamb =80 °C, due to its temperature drift, the AFC output voltage differs from 1.5 V. The input frequency must,
therefore, be adjusted to obtain 1.5 V at the AFC output. The drift of the AFC voltage will then be equal to the
difference between the new input frequency and 480 MHz.
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