TDA9874H datasheet(19/56 Pages) PHILIPS

19 / 56 page

1998 Apr 27

Philips Semiconductors

Preliminary speciﬁcation

Digital TV sound demodulator/decoder

TDA9874H

7.3.1

AGC GAIN REGISTER (AGCGR)

If the Automatic Gain Control (AGC) function is switched off in the General Configuration Register (see Section 7.3.2),

the contents of this register defines a fixed gain of the SIF input stage. The input voltages given are meant to generate

a nearly full-scale output from the SIF ADC. If the AGC is on, the contents of this register are ignored. The default setting

at power-up is 00000000. In Table 12 the stated step number corresponds with the SIF level read from subaddress 7

(see Section 7.4.6); the input voltages should be considered as approximate target values.

Table 12 AGC Gain Register (subaddress 0)

76543210

STEP

SIF INPUT VOLTAGE

(mV (RMS))

00011111

240

00011110

214

00011101

195

00011100

176

00011011

159

00011010

145

00011001

131

00011000

119

00010111

107

00010110

00010101

00010100

00010011

00010010

00010001

00010000

00001111

00001110

00001101

00001100

00001011

00001010

00001001

00001000

00000111

00000110

00000101

00000100

00000011

00000010

00000001

00000000

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