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參數(shù)資料
| 型號(hào)： | 935241000118 |
| 廠(chǎng)商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | PLASTIC, SOT-266, SSOP-20 |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 136K |
| 代理商： | 935241000118 |
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1997 May 26
9
Philips Semiconductors
Product specication
Low power PLL FM demodulator for
satellite TV receivers
TDA8012AM
13. For applications in which a fixed AGC threshold is used, it is recommended to use the internal resistor voltage divider
for lower AGC threshold spread. In this case, the threshold is set to 57 dB
V.
14. 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.
15. 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.
16. This current discharges the external capacitors between two energy dispersal peak values and avoid the use of
external resistors in parallel with capacitors.
17. The drift of the automatic frequency control voltage is measured in accordance with the following method:
a) At room temperature (Tamb =25 °C) the TDA8012AM 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
be adjusted to obtain 1.5 V at the AFC output. Then the VCO frequency fVCO is measured in free running mode
(without input signal). The drift of the automatic frequency control voltage will then be equal to the difference
between the input frequency and fVCO.
Fig.3 AFC and carrier detector output.
handbook, full pagewidth
MBH932
0
frequency
0.15
0.3
0.45
0.6
0.8
1
AFC DATA
V19
VCC
carrier detect on
f o
500 kHz
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