AD1835

The AD1835 is available in a 52-lead MQFP package and is specified for the industrial temperature range of -40°C to 85°C which is a high-performance, single-chip codec featuring four stereo DACs and one stereo ADC. Each DAC comprises a high-performance digital interpolation filter, a multibit sigma-delta modulator featuring Analog Devices's patented technology and a continuous-time voltage out analog section. The ADC comprises two 24-bit conversion channels with multibit sigma-delta modulators and decimation filters. While the AD1835 can be operated from a single 5 V supply, it also features a separate supply pin for its digital interface that allows the device to be interfaced to other devices using 3.3 V power supplies. The AD1835 also contains an on-chip reference with a nominal value of 2.25 V. Each DAC has independent volume control and clickless mute functions. The AD1835 contains a flexible serial interface that allows for glueless connection to a variety of DSP chips, AES/EBU receivers, and sample rate converters. The AD1835 can be configured in left-justified, right-justified, I2S-, or DSP-compatible serial modes. Control of the AD1835 is achieved by means of an SPI-compatible serial port.

The features of AD1835 can be summarized as (1)5V stereo audio system with 3.3 V tolerant digital interface; (2)supports up to 96 kHz sample rates; (3)192 kHz sample rate available on one DAC; (4)supports 16-/20-/24-Bit word lengths; (5)multibit sigma-delta modulators with "perfect differential linearity restoration"-for reduced idle tones and noise floor; (6)data directed scrambling DACs-leas sensitive to jitter; (7)differential output for optimum performance ADCs: -92 dB THD + N, 100 dB SNR, and dynamic range, DACs: -95 dB THD + N, 110 dB SNR, and dynamic range; (8)on-chip volume controls per channel with 1024-step linear scale; (9)DAC and ADC software controllable clickless mutes digital de-emphasis processing; (10)power-down mode plus soft power-down mode; (11)flexible serial data port with right-justified, left-Justified, I2S-compatible, and DSP serial port modes; (12)TDM interface mode supports 8 In/8 out using a single SHARC SPORT; (13)52-lead MQFP plastic package. I t can be used in DVD video and audio players; home theater systems; automotive audio systems; (14)audio/visual receivers; digital audio effects processors.

The absolute maximum ratings of AD1835 are (1)AVDD , DVDD, OVDD  to AGND, DGND: -0.3 V to +6.0V ; (2)AGND to DGND: -0.3 V to +0.3V; (3)digital I/O voltage to DGND: -0.3 V to ODVDD+ 0.3V; (4)analog I/O voltage to AGND: -0.3 V to ADD+0.3 V; (5)operating temperature range industrial (A version): -40°C to +85°C(stresses above those listed under absolute maximum ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for; (6)extended periods may affect device reliability).