AM79C30AVC datasheet(34/101 Pages) AMD

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Am79C30A/32A Data Sheet

Map Mode Register 3 — (MMR3) — Read/Write

Address Indirect 6CH

Secondary Tone Ringer Amplitude Register — (STRA) — Read/Write

Address = Indirect 6DH

Table 35.

Map Mode Register 3

Bit

Function

Bit 7 Reserved, must be written to 0

0-dB pre-amplifier gain, 1.250-V maximum peak input voltage

+6-dB pre-amplifier gain, 0.625-V maximum peak input voltage

+12-dB pre-amplifier gain, 0.312-V maximum peak input voltage

+18-dB pre-amplifier gain, 0.156-V maximum peak input voltage

+24-dB pre-amplifier gain, 0.078-V maximum peak input voltage

Reserved; undefined

MUTE ON, AINA and AINB inputs disabled

MUTE OFF, AINA or AINB enabled

Digital Loopback 2 enabled; D/A output looped to A/D input; EAR, LS, and AIN pin disabled

Digital Loopback 2 disabled

EAR and LS simultaneously enabled

EAR or LS enabled by MMR2 bit 1

Secondary Tone Ringer enabled

Secondary Tone Ringer disabled

Table 36.

Secondary Tone Ringer Amplitude

Bit

Peak-to-Peak

Output Voltage

Relative Output

Approximate Power

into 50 ohms

Silent

Reserved

0.22 V

–27 dB

0.25 mW

0.31 V

–24 dB

0.5 mW

0.44 V

–21 dB

1.0 mW

0.62 V

–18 dB

2.0 mW

0.88 V

–15 dB

4.0 mW

1.25 V

–12 dB

8.0 mW

1.77 V

–9 dB

16.0 mW

2.50 V

–6 dB

31.25 mW

3.53 V

–3 dB

62.5 mW

5.00 V

0 dB

125.0 mW

Bits 0–3 Reserved;

must be written to 0

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