參數(shù)資料
型號(hào)： TDA9887TS/V3
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
封裝： 5.30 MM, PLASTIC, MO-150, SOT-340-1, SSOP-24
文件頁(yè)數(shù)： 28/56頁(yè)
文件大?。?/td> 230K
代理商： TDA9887TS/V3
2002 Mar 05
34
Philips Semiconductors
Product specication
I2C-bus controlled multistandard alignment-free
IF-PLL demodulator with FM radio
TDA9887TS
4. Loop bandwidth BL = 70 kHz (damping factor d = 1.9; calculated with sync level within gain control range).
Calculation of the VIF-PLL filter can be done by use of the following formula:
, valid for d
≥ 1.2
,
where:
KO is the VCO steepness
or
; KD is the phase detector steepness
;
R is the loop resistor; C is the loop capacitor; BL3dB is the loop bandwidth for 3 dB; d is the damping factor.
5. Vi(VIF) = 10 mV (RMS); f = 1 MHz (VCO frequency offset related to picture carrier frequency); white picture video
modulation.
6. Condition: luminance range (5 steps) from 0% to 100%.
7. S/N is the ratio of black-to-white amplitude to the black level noise voltage (RMS value on pin CVBS). B = 5 MHz
(B/G, I and D/K standard). Noise analyzer setting: 200 kHz high-pass and SC-trap switched on.
8. The intermodulation figures are defined for:
a) f = 1.1 MHz (referenced to black and white signal) as
b) f = 3.3 MHz (referenced to colour carrier) as
9. Measurements taken with SAW filter M1963M (sound shelf: 20 dB); loop bandwidth BL = 70 kHz.
a) Modulation Vestigial Side-Band (VSB); sound carrier off; fvideo > 0.5 MHz.
b) Sound carrier on; fvideo = 10 kHz to 10 MHz.
10. AC load; CL < 20 pF and RL >1k. The sound carrier frequencies (depending on TV standard) are attenuated by
the integrated sound carrier traps (see Figs 13 to 18;
H (s) is the absolute value of transfer function).
11. The sound carrier trap can be bypassed by switching the I2C-bus. In this way the full composite video spectrum
appears at pin CVBS. The amplitude is 1.1 V (p-p).
12. If selected by the I2C-bus, the VIF-AGC voltage can be monitored at pin OP2, and pin OP1 can be used as input. In
this case, both pins cannot be used for the normal port function.
13. The response time is valid for a VIF input level range from 200
Vto70mV.
14. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
given in Fig.9. The AFC slope (voltage per frequency) can be changed by resistors R1 and R2.
15. The tolerance of the reference frequency determines the accuracy of the VIF-AFC, FM demodulator centre
frequency and maximum FM deviation.
BL
3dB
–
1
2
π
------- KOKDR
=
d
1
2
--- RKOKDC
=
rad
V
--------
2
π
Hz
V
-------
A
rad
--------
α
IM
20
V
0 at 4.4 MHz
V
0 at 1.1 MHz
-------------------------------------
3.6 dB
+
log
=
α
IM
20
V
0 at 4.4 MHz
V
0 at 3.3 MHz
-------------------------------------
log
=
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