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AD1893:  Low Cost SamplePort 16-Bit ASRC

Product Details

The AD1893 SamplePort is a fully digital, stereo Asynchronous Sample Rate Converter (ASRC) that solves sample rate interfacing and compatibility problems in digital audio equipment. The AD1893 is intended for 16-bit, low cost, non-varispeed applications where low voltage, low power operation is required. (Refer to the AD1890/AD1891 data sheet for other products in the SamplePort family.) This device is asynchronous because the frequency and phase relationships between the input and output sample clocks (both are inputs to the AD1893 ASRC) are arbitrary and need not be related by a simple integer ratio. There is no need to explicitly select or program the input and output sample clock frequencies, as the AD1893 automatically senses the relationship between the two clocks. The input and output sample clock frequencies can nominally range from 8 kHz to 56 kHz, and the ratio between them can vary from approximately 1:2 to 2:1.

The input and output control signals allow for considerable flexibility for interfacing to a variety of DSP chips, AES/EBU receivers and transmitters and for I2S compatible devices. Input and output data can be independently right- or left- (with or without a one bit clock delay) justified to the left/right clock edge. In the right-justified mode, the MSB is delayed 16 bit clock periods from the left/right clock edge transition. Input and output data can also be independently justified to the word clock rising edge. The data justification options are encoded on two mode pins for both the input port and the output port.

The AD1893 is fabricated in a 0.8 µm single poly, double metal CMOS process and are packaged in a 0.6" wide 28-pin plastic DIP and a 10 mm by 10 mm body size 44-pin TQFP. The AD1893 operates from a +3 V to +5 V power supply over the temperature range of 0°C to +70°C.

For more information on ADI's Audio Portfolio, visit the Audio Solutions home page.


  • Low Cost
  • LQFP and PDIP Packages
  • 3 V Supply Performance Specified—Very Low Power
  • Automatically Senses Sample Frequencies—No Programming Required
  • Rejects Sample Clock Jitter
  • Accommodates Dynamically Changing Asynchronous Sample Clocks
  • 8 kHz to 56 kHz Sample Clock Frequency Range
  • See datasheet for additional features

Functional Block Diagram for AD1893


Title Content Type File Type
AD1893: Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter Data Sheet (Rev A, 12/1998) (pdf, 216 kB) Data Sheets PDF
AN-327: DAC ICs: How Many Bits Is Enough?  (pdf, 345 kB)
Digital audio playback DACs are available in a variety of different architectures--each with it's own performance tradeoffs.
Application Notes PDF
AN-211: The Alexander Current-Feedback Audio Power Amplifier  (pdf, 1154 kB) Application Notes PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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AD1893 Model Options
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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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