TDA9816M datasheet(21/44 Pages) PHILIPS

21 / 44 page

1997 Nov 19

Philips Semiconductors

Preliminary speciﬁcation

Multistandard multimedia IF-PLL and FM

radio demodulator

TDA9816M

10. Measurements taken with SAW filter K3953 (sound carrier suppression: 40 dB); loop bandwidth = 70 kHz.

a) Modulation VSB; sound carrier off; fvideo > 0.5 MHz.

b) Sound carrier on; SIF SAW filter K9453; fvideo = 10 kHz to 10 MHz.

11. Response speed valid for a VIF input level range of 200

µVupto70mV.

12. A current source output is provided to match the AFC output signal to different tuning systems. The test circuit is

given in Fig.7 for TV mode and in Fig.13 for radio mode. The AFC steepness can be changed by the resistors at

pin 19.

a) A voltage output is provided to match the AFC output signal to different tuning systems. The DC load current

should not exceed 180

µA.

13. Depending on the ratio

∆C/C0 of the LC resonant circuit of the VCO (Q0 > 50; see note 3; C0 =Cint +Cext).

14. Source impedance: 2.3 k

Ω in parallel with 12 pF (SAW filter); fIF = 38.9 MHz.

15. Without using an SIF SAW filter the mixer can be switched to intercarrier mode by connecting pin 27 and/or pin 28

to ground. In this mode the SIF passes the VIF SAW filter and IF intercarrier levels are dependant on the sound shelf

of the VIF SAW filter. The intercarrier output signal at pin 14 can be calculated with the following formula using the

video output signal at pin 18 (Vo(video)(p-p) = 1.1 V typical) as a reference:

with

= correction term for RMS value,

= sound-to-picture carrier ratio at VIF input (pins 1 and 2) in dB,

6 dB = correction term of internal circuitry and

±3 dB = tolerance of video output and intercarrier output amplitude

Vo(rms).

Example: SAW filter G1962 (sound shelf: 20 dB)

⇒⇒ V

o(rms) = 32 mV (typ.).

16. Input level for second IF from an external generator with 50

Ω source impedance. AC-coupled with 10 nF capacitor,

fmod = 1 kHz, 27 kHz (54% FM deviation) of audio reference. A VIF/SIF input signal is not permitted. Pins 6 and 5

have to be connected to positive supply voltage for minimum IF gain. S/N and THD measurements are taken at

µs de-emphasis at pin 14 (modulator pre-emphasis has to be activated). The FM demodulator steepness

∆V

o(AF)/∆fAF is positive.

a) Second IF input level 10 mV (RMS).

17. Measured with an FM deviation of 27 kHz, the typical AF output signal is 500 mV (RMS) (Rx =0 Ω). By using

Rx = 680 Ω the AF output signal is attenuated by 6 dB (250 mV RMS). For handling a frequency deviation of more

than 53 kHz the AF output signal has to be reduced by using Rx in order to avoid clipping (THD < 1.5%). For an

FM deviation up to 100 kHz an attenuation of 6 dB is recommended with Rx = 680 Ω.

18. The leakage current of the decoupling capacitor (2.2

µF) should not exceed 1 µA.

19. For all S/N measurements the used vision IF modulator has to meet the following specifications:

a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.

b) QSS AF performance, measured with the television-demodulator AMF2 (audio output, weighted S/N ratio) better

than 60 dB (deviation

±27 kHz) for 6 kHz sine wave black-to-white video modulation.

c) Picture-to-sound carrier ratio; PC/SC1 = 13 dB; (transmitter).

o rms

()

1.1 V p

–

()

-----------

iSC

()

iPC

()

----------------- dB

() 6dB 3 dB

--------------------------------------------------------------------

-----------

iSC

()

iPC

()

----------------- dB

()

iSC

()

iPC

()

-----------------

27 dB

–

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