AD1955

High Performance, Multibit Sigma-Delta DAC with SACD Playback

Data Sheet

Rev. 0

Production

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Overview

Features and Benefits
Product Details

Features and Benefits

Supports 24-Bits, up to 192 kHz Sample Rate PCM Audio Data
Supports SACD bit-stream and External Digital Filter Interface
Multibit Sigma Delta Modulator with "Perfect Differential Linearity Restoration" for Reduced Idle Tones and Noise Floor
Data Directed Scrambling DAC - Least Sensitive to Jitter
8.64 mA p-p Differential Output Current for Optimum Performance, with +3 dB headroom in SACD mode
5 V Power Supply Stereo Audio DAC System

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
Flexible Serial Data Port with Right-Justified, Left-Justified, I²S-Compatible and DSP Serial Port
28 Lead SSOP Plastic Package

Product Details

The AD1955 is a complete, high performance, single chip stereo digital audio playback system comprised of a multi-bit sigma-delta modulator, digital interpolation filters and a continuous-time differential current output DAC section. Unique to this audio DAC is the separate SACD (super audio CD) bit-stream and external digital filter interface, which allows users maximum system flexibility. The AD1955 supports 24-bits, 192 kHz sample rate and is designed for use in high-end SACD players, DVD-audio, home theater, automotive audio, digital mixing consoles, digital audio effect processors and sampling musical keyboards.

Applications

High-End DVD-Audio, SACD, CD, Home Theatre Systems
Automotive Audio Systems, Sampling Musical Keyboards, Digital
Mixing Consoles, Digital Audio Effects Processors

Product Categories

Audio and Video Products
- Audio D/A Converters

D/A Converters (DAC)
- Audio D/A Converters

Markets and Technologies

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

EVAL-AD1955

AD1955 Evaluation Board

EVAL-ADUSB2EBZ

ADUSB2EBZ Evaluation Board

EVAL-ADUSB2EBZ

View Detailed Evaluation Kit Information

The Analog Devices USBi “USB Interface” (EVAL-ADUSB2EBZ) board is the interface between your PC's USB port and SigmaDSP hardware's data input pins. This interface can be used with any evaluation board which includes an External SPI/I²C header (Aardvark Header). The EVAL-ADUSB2EBZ board is capable of both SPI and I²C communication (which is user selectable) and can supply IOVDD of either 3.3V or 1.8V.The USBi interface is powered from the computer's USB port.

To Install the USBi Board:

Connect the USB cable to the USBi Board a spare USB port on your PC.
The Windows “Found New Hardware Wizard” will launch.
Choose “Install from a list or a specific location” and click “Next”.
Select “Search for the best driver in these locations” and Check the box for “Include this location in the search.”
Press the “Browse” button and locate the appropriate driver file in the SigmaStudio application folder (default folder is C:\Program Files\Analog Devices Inc\Sigma Studio\USB drivers): Select the CyUSB.inf file.
Click “Continue Anyway” if you're prompted with “This software has not passed Windows Logo testing.”

Using USBi in SigmaStudio:

To communication between SigmaStudio and the USBi board, a communication channel block must be added to the Schematic design. To locate the block, select the Hardware Configuration Tab, in the ToolBox or Tree ToolBox window choose the “Communication Channels” category, and select the USBi block.

This block provides connections for multiple processors (ICs / DSPs), allowing you to use multiple processors in a single design. This block allows you to explicitly specify both the communication protocol (SPI or I²C) and the part's address, I²C address or SPI catch line. The DSP hardware's address must match the block's selected address for communication to function properly. See the parts data sheet for more information about addressing (e.g. ADR_SEL, ADDR0, or ADDR1 pins). The default USBi protocol is I²C, to enable SPI, you must first select an SPI address in the block's drop down menu and then perform three write operations (e.g. press the write button the Register Read/Write Window 3 times). The USBi hardware has LEDs which indicate the current mode, I²C or SPI.

Features & Benefits

EVAL-ADUSB2EBZ "USBi"

Digital I/O: USB input, I2C/SPI output
DC Supply: 5 V (USB)

Documentation

Data Sheets (1)

PDF

897 kB

AD1955: High Performance Multibit Sigma-Delta DAC with SACD Playback Data Sheet (Rev. 0)

Application Notes (3)

PDF

89 kB

AN-349: Keys to Longer Life for CMOS

PDF

1154 kB

AN-211: The Alexander Current-Feedback Audio Power Amplifier

AN-1006: Using the EVAL-ADUSB2EBZ

User Guides (1)

PDF

1775 kB

UG-048: Evaluation Board User Guide for AD1955

Software & Systems Requirements

Software Modules

ZIP

4.51 M

Automated Register Window Builder, Version 3.2.1

Evaluation Software

ZIP

3923 kB

Automated Register Window Builder

ZIP

2828 kB

AD1955 Evaluation Board Software

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.

Quality And Reliability

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PCN-PDN Information

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Support & Discussions

AD1955 Discussions

RE: AD1955 : DSD_CLK in the SACD mode

RE: How to use AD1955 EVB

RE: AD1955 Output stage

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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