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AD1855 Datasheet(PDF) 1 Page - Analog Devices |
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AD1855 Datasheet(HTML) 1 Page - Analog Devices |
1 / 15 page a AD1855* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. REV. B Stereo, 96 kHz, Multibit DAC FUNCTIONAL BLOCK DIAGRAM ATTEN/ MUTE ATTEN/ MUTE SERIAL DATA INTERFACE 8 INTERPOLATOR MULTIBIT SIGMA- DELTA MODULATOR SERIAL CONTROL INTERFACE CLOCK CIRCUIT OUTPUT BUFFER OUTPUT BUFFER DAC DAC MULTIBIT SIGMA- DELTA MODULATOR VOLTAGE REFERENCE VOLUME MUTE CONTROL DATA INPUT 3 2 DIGITAL SUPPLY CLOCK IN 96/ 48FS CLOCK ANALOG OUTPUTS 2 2 ZERO FLAG ANALOG SUPPLY DE-EMPHASIS MUTE PD/RST 2 SERIAL MODE 16-/18-/20-/24-BIT DIGITAL DATA INPUT AD1855 8 INTERPOLATOR 3 384/ 256 X2MCLK FEATURES 5 V Stereo Audio DAC System Accepts 16-/18-/20-/24-Bit Data Supports 24 Bits and 96 kHz Sample Rate Multibit Sigma-Delta Modulator with “Perfect Differen- tial Linearity Restoration” for Reduced Idle Tones and Noise Floor Data Directed Scrambling DAC—Least Sensitive to Jitter Differential Output for Optimum Performance 113 dB Signal-to-Noise and Dynamic Range at 48 kHz Sample Rate 110 dB Signal-to-Noise and Dynamic Range at 96 kHz Sample Rate –97 dB THD+N On-Chip Volume Control with 1024 Steps Hardware and Software Controllable Clickless Mute Zero Input Flag Outputs for Left and Right Channels Digital De-Emphasis Processing Supports 128, 256, 384, and 512 FS Master Mode Clock Switchable Clock Doubler Power-Down Mode Plus Soft Power-Down Mode Flexible Serial Data Port with Right-Justified, Left- Justified, I2S-Compatible and DSP Serial Port Modes 28-Lead SSOP Plastic Package APPLICATIONS DVD, CD, Set-Top Boxes, Home Theater Systems, Auto- motive Audio Systems, Computer Multimedia Prod- ucts, Sampling Musical Keyboards, Digital Mixing Consoles, Digital Audio Effects Processors *Patents Pending. PRODUCT OVERVIEW The AD1855 is a high performance, single-chip stereo, audio DAC delivering 113 dB Dynamic Range and SNR (A-weighted— not muted) at 48 kHz sample rate. It is comprised of a multibit sigma-delta modulator with dither, continuous time analog filters and analog output drive circuitry. Other features include an on-chip stereo attenuator and mute, programmed through an SPI-compatible serial control port. The AD1855 is fully com- patible with current DVD formats, including 96 kHz sample frequency and 24 bits. It is also backwards compatible by sup- porting 50 µs/15 µs digital de-emphasis intended for “redbook” 44.1 kHz sample frequency playback from compact discs. The AD1855 has a very simple but very flexible serial data input port that allows for glueless interconnection to a variety of ADCs, DSP chips, AES/EBU receivers and sample rate converters. The AD1855 can be configured in left-justified, I 2S, right- justified, or DSP serial port compatible modes. The AD1855 accepts 16-/18-/20-/24-bit serial audio data in MSB first, twos- complement format. A power-down mode is offered to mini- mize power consumption when the device is inactive. The AD1855 operates from a single +5 V power supply. It is fabri- cated on a single monolithic integrated circuit and housed in a 28-lead SSOP package for operation over the temperature range 0 °C to +70°C. |
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