tda9817t NXP Semiconductors, tda9817t Datasheet - Page 18

• Manufacturer Part Number: tda9817t
• Description: Single/multistandard Vif/sif-pll And Fm-pll/am Demodulators
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes
1. Values of video and sound parameters are decreased at V
2. This parameter is not tested during production and is only given as an application information for designing the
3. Loop bandwidth BL = 70 kHz (natural frequency f
4. Temperature coefficient of external LC circuit is equal to zero.
5. V
6. VIF signal for nominal video signal.
7. The leakage current of the AGC capacitor should not exceed 1 A at B/G standard, respectively 10 nA current at
8. S/N is the ratio of black-to-white amplitude to the black level noise voltage (RMS value, pin CVBS). B = 5 MHz
9. The intermodulation figures are defined:
10. Measurements taken with SAW filter K3953 (sound carrier suppression: 40 dB); loop bandwidth BL = 70 kHz:
11. Response speed valid for a VIF input level range of 200 V up to 70 mV.
12. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
13. Depending on the ratio C/C
14. Source impedance: 2.3 k in parallel to 12 pF (SAW filter); f
15. Without using an SIF SAW filter the mixer can be switched to intercarrier mode by connecting pin SIF1 and/or
2004 Jun 29
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
television receiver.
gain control range). Resonance circuit of VCO: Q
approximately 2.7 V).
video modulation.
L standard. Larger currents will increase the tilt.
weighted in accordance with “CCIR 567” .
a) Modulation VSB; sound carrier off; f
b) Sound carrier on; SIF SAW filter K9453; f
given in Fig.9. The AFC-steepness can be changed by the resistors at pin AFC.
pin SIF2 to ground. In this mode the SIF passes the VIF SAW filter and IF intercarrier levels are depending on the
sound shelf of the VIF SAW filter. The intercarrier output signal at pin QSS can be calculated by the following formula
taking into account the video output signal at pin CVBS (V
a)
b)
c) 6 dB = correction term of internal circuitry
d)
i(VIF)(rms)
1.1
3.3
V
---------- -
2 2
------------- - (dB)
V
V
o(rms)
3 dB = tolerance of video output and intercarrier output amplitude V
1
=
=
i(sc)
i(pc)
20
20
= correction term for RMS value
=
= 10 mV; f = 1 MHz (VCO frequency offset related to picture carrier frequency); white picture
log
log
1.1 V p p
= sound-to-picture carrier ratio at VIF inputs in dB
V
------------------------------------- -
V
V
------------------------------------- -
V
o
o
o
o
at 4.4 MHz
at 1.1 MHz
at 4.4 MHz
at 3.3 MHz
–
---------- -
2 2
1
0
of the LC resonant circuit of VCO (Q
+
;
3.6 dB
10
3.3
V
------------ dB
V
------------------------------------------------------------- -
value at 3.3 MHz referenced to colour carrier.
i(sc)
i(pc)
video
;
1.1
> 0.5 MHz.
+
20
video
6 dB 3 dB
value at 1.1 MHz referenced to black/white signal;
n
0
= 10 kHz to 10 MHz.
= 12 kHz; damping factor d
> 50; C
18
o(CVBS)(p-p)
where:
ext
P
IF
= 4.5 V.
= 8.2 pF 0.25 pF; C
= 38.9 MHz.
0
> 50; note 3; C
= 1.1 V typical) as a reference:
o(rms)
3; calculated with sync level within
int
TDA9817; TDA9818
0
= C
8.5 pF (loop voltage
int
+ C
Product specification
ext
).