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TDA8722

I2C-bus programmable modulator for negative video modulation and FM sound

Philips Electronics 

Philips Semiconductors

I2C-bus programmable modulator for

negative video modulation and FM sound

Product specification

TDA8722

QUICK REFERENCE DATA

VDDA = VDDD = 5 V; Tamb = 25 °C after the IC has reached thermal equilibrium; unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

VDDA

VDDD

IDD

∆m

∆P/S

VRF

δf

analog supply voltage

4.5

5.0

digital supply voltage

4.5

5.0

total supply current

normal mode

41

52

typical modulation depth range video level (pin 19) = 0.5 V (p-p); 65

−

note 1; see Fig.10

typical picture-to-sound level

range

note 2; see Fig.11

−18 −

RF output voltage level

asymmetrical on a 75 Ω load

frequency between

471.25 and 855.25 MHz

77

80

FM deviation on audio

subcarrier

fi = 400 Hz; V1 = 0.5 V (RMS);

20

25

before pre-emphasis filter

5.5

V

5.5

V

63

mA

90

%

−10 dB

83

dBµV

30

kHz

Notes

1. Value depends on value of resistor R17 (see Fig.7).

2. Value depends on value of capacitor C17 (see Fig.7).

1998 Jun 23

3

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