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AD1955YRSRL Fiches technique(PDF) 1 Page - Analog Devices |
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AD1955YRSRL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 10 page PRELIMINARY TECHNICAL DATA a High Performance Multibit Σ∆ Σ∆ Σ∆ Σ∆ DAC with SACD Playback Preliminary Technical Data AD1955 Rev. PrF 3/18/2002 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 ©Analog Devices, Inc., 2002 FEATURES 5V Power Supply Stereo Audio DAC System. Accepts 16/18/20/24-Bit Data Supports 24-Bits, 192kHz Sample Rate PCM Audio Data Supports SACD bit-stream and External Digital Filter Interface Accepts a Wide Range of PCM Sample Rates Including: 32kHz, 44.1kHz. 48kHz, 88.2kHz, 96kHz, and 192kHz Multibit Sigma Delta Modulator with “Perfect Differential Linearity Restoration” for Reduced Idle Tones and Noise Floor Data Directed Scrambling DAC - Least Sensitive to Jitter Supports SACD playback with “Bit Expansion” filter Differential Current Output for Optimum Performance 8.64 mA p-p Output Current with +3dB headroom in SACD mode 120 dB SNR/DNR (not muted) at 48KHz Sample Rate (A-Weighted Stereo) 123 dB SNR/DNR (Mono) -110 dB THD+N 110 dB Stopband Attenuation with +/-0.0002dB Passband Ripple 8 Times Oversampling Digital Filter On-chip Clickless Volume Control Supports SACD-Mute pattern detection Supports 64fs/128fs DSD SACD with phase modulation Internal Digital Filter pass-through for External Filter Master clock: 256fs,384fs,512fs,768fs Hardware and Software Controllable Clickless Mute Serial (SPI) Control for: Serial Mode, Number of Bits, Sample Rate, Volume, Mute, De-emphasis, Mono Mode Digital De-emphasis for 32, 44.1, 48 KHz Sample Rates Flexible Serial Data Port with Right-Justified, Left-Justified, I2S-Compatible and DSP Serial Port 28 Lead SSOP Plastic Package APPLICATIONS High-End DVD-Audio, SACD, CD, Home Theatre Systems, Automotive Audio Systems, Sampling Musical Keyboards, Digital Mixing Consoles, Digital Audio Effects Processors PRODUCT OVERVIEW The AD1955 is a complete high performance single-chip stereo digital audio playback system. It is comprised of a multibit sigma-delta modulator, high performance digital interpolation filters, and continuous- time differential current output DAC section. Other features include an on-chip clickless stereo attenuator, mute capability, programmed through an SPI-compatible serial control port. The AD1955 is fully compatible with all known DVD audio formats including 192kHz as well as 96kHz sample frequencies and 24-bits. It also is backwards compatible by supporting 50/15 µs digital de-emphasis intended for “redbook” Compact Discs, as well as de-emphasis at 32kHz and 48kHz sample rate. The AD1955 has a very flexible serial data input port that allows for glueless interconnection to a variety of ADCs, DSPs, SACD decoder, external digital filter, AES/EBU receivers and sample rate converters. The AD1955 can be configured in Left-justified, I2S, Right-Justified, or DSP serial port compatible modes. It can support MSB first, twos- compliment format, 16, 18, 20 and 24 bits in all standard PCM modes. Also the AD1955 has an interface for SACD playback and an external digital filter interface for use with an external digital interpolation filter or HDCD decoder. The AD1955 uses a +5 V power supply. It is fabricated on a single monolithic integrated circuit and is housed in a 28- pin SSOP package for operation over the temperature range -400C to +1050C. FUNCTIONAL BLOCK DIAGRAM Multibit Sigma-Delta Modulator Noise- Shaped Scrambling I-DAC I-DAC Serial Data Interface External Filter I/F DSD Filter M U X Voltage Reference SPI Control Auto-Clock Divider Control Data Input 3 Master Clock Input 16/20/24Bit Audio Data / External Digital Filter Input DSD Bitstream Input 4 3 / 4 Differential Current Output L-ch R-ch Digital Supply Analog Supply ZERO Flags MUTE RESET S/H Digital Filter Engine |
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