TDA9845 datasheet(8/20 Pages) PHILIPS

8 / 20 page

1995 Mar 20

Philips Semiconductors

Preliminary speciﬁcation

TV and VTR stereo/dual sound processor

with digital identiﬁcation

TDA9845

CHARACTERISTICS

VP =5V; Tamb = +25 °C; nominal input signal Vi1,2 = 0.25 V RMS value (FM: 54% modulation is equivalent to

∆f= ±27 kHz); nominal input signal Vi1 = 0.5 V RMS value (AM: m = 0.54); nominal input signal Vi3 = 0.25 V RMS

value (AM: m = 0.54); nominal output signal Vo1,2 = 0.5 V RMS value; fAF = 1 kHz; Vi pil = 16 mV RMS value;

fpil = 54.6875 kHz (identiﬁcation frequencies: stereo = 117.48 Hz, dual = 274.12 Hz), 50 µs pre-emphasis;

noise measurement in accordance with

“CCIR468-3”, working oscillator frequency fω = 10008 MHz;

currents into the IC positive; measured in test circuit Fig.5 unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

supply voltage (pin 18)

4.5

8.8

supply current (pin 18)

without LED current

16.5

Ptot

total power dissipation

145.2

Vn(DC)

DC voltage

(pins 8 to 13 and 17)

⁄2VP − 0.1 1⁄2VP

⁄2VP + 0.1 V

Vref(DC)

DC reference voltage (pin 7)

⁄2VP − 0.1 1⁄2VP

⁄2VP + 0.1 V

lL(DC)

DC leakage current (pin 7)

−−

±1

µA

AF Inputs; Vi1 and Vi2 (pins 8 and 9)

Vi(rms)

nominal input signal voltage

(RMS value)

54% modulation

B/G

−

0.25

−

L (only Vi1)

−

0.5

−

Vi(rms)

clipping voltage level

(RMS value)

THD

≤ 1.5%

VP = 5 V; B/G

0.625

0.715

−

VP = 8 V; B/G

1.050

1.200

−

VP = 5 V; L (only Vi1)

1.200

1.600

−

VP = 8 V; L (only Vi1)

2.100

2.356

−

AF signal voltage gain

G = Vo/Vi; note 1

B/G

7dB

L (only Vi1)

−1

input resistance

Ω

Rdeem

internal de-emphasis resistor

(pins 13 and 17)

see Fig.4

4.25

5.0

5.75

Ω

Additional AF input pin (pin 10)

Vi(rms)

nominal input signal voltage

(RMS value)

54% modulation

−

0.25

−

Vi(rms)

clipping voltage level

(RMS value)

THD

≤ 1.5%

VP = 5 V

0.625

0.715

−

VP =8V

1.050

1.200

AF signal voltage gain

G=Vo/Vi; note 1

7dB

input resistance

Ω

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