Digital-to-analog converter with a flexible data interface

Details Digital-to-analog converter with a flexible data interface Digital-to-analog converter with a flexible data interface

1992-03-30

1994-08-16

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

377 67, H03M 166, G11C 1900

Patent

active

053390792

ABSTRACT:
A flexible data interface (21, 22) for a digital-to-analog converter (25, 26) includes a mute circuit (46, 70, 71 ) to mute and de-mute input data in 6 dB steps over a time period such as one-quarter of a second. The mute circuit includes a counter (46) to provide mute signals, a decoder (70) to decode the mute signals, and a shift matrix (71) to shift the data from zero to the maximum number of bits in response to the decoded signals. The interface (21, 22) includes a programmable shift register (43) to allow different data word lengths, such as 20-, 18-, or 16-bit, to be presented to the digital-to-analog converter (25, 26). The interface (21, 22) also includes a multiplexer (47) to allow left- and right-channel data to be received either time-multiplexed on a single pin, or on two separate pins.

REFERENCES:
patent: 4771279 (1988-09-01), Hannah
patent: 5033067 (1991-07-01), Cole et al.
patent: 5057840 (1991-10-01), Ledzius et al.
"SAA7350 20-bit Input Bitstream Conversion DAC for Digital Audio Systems," Phillips Semiconductors, Feb., 1991.

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