SamplePort Stereo Asynchronous
Sample Rate Converters
a
AD1890/AD1891
SYSTEM D IAGRAM
FEATURES
Autom atically Sense Sam ple Frequencies—No
Program m ing Required
Tolerant of Sam ple Clock J itter
Sm ooth Transition When Sam ple Clock Frequencies
Cross
EXAMPLE
FREQUENCIES:
DAT 48kHz OR
CD 44.1kHz OR
BROADCAST 32kHz
EXAMPLE
FREQUENCIES:
DAT 48kHz OR
CD 44.1kHz OR
BROADCAST 32kHz
AD1890/
AD1891
Accom m odate Dynam ically Changing Asynchronous
Sam ple Clocks
INPUT SAMPLE CLOCK
OUTPUT SAMPLE CLOCK
8 kHz to 56 kHz Sam ple Clock Frequency Range
1:2 to 2:1 Ratio Betw een Sam ple Clocks
–106 dB THD+N at 1 kHz (AD1890)
120 dB Dynam ic Range (AD1890)
Optim al Clock Tracking Control
–Short/ Long Group Delay Modes
–Slow / Fast Settling Modes
OUTPUT SERIAL DATA
INPUT SERIAL DATA
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 1:2 to 2:1.
Linear Phase in All Modes
Equivalent of 4 Million 22-Bit FIR Filter Coefficients
Stored On-Chip
Autom atic Output Mute
Flexible Four Wire Serial Interfaces
Low Pow er
T he AD1890/AD1891 use multirate digital signal processing
techniques to construct an output sample stream from the input
sample stream. T he input word width is 4 to 20 bits for the
AD1890 or 4 to 16 bits for the AD1891. Shorter input words
are automatically zero-filled in the LSBs. T he output word
width for both devices is 24 bits. T he user can receive as many
of the output bits as desired. Internal arithmetic is performed
with 22-bit coefficients and 27-bit accumulation. T he digital
samples are processed with unity gain.
APPLICATIONS
Digital Mixing Consoles and Digital Audio Workstations
CD-R, DAT, DCC and MD Recorders
Multitrack Digital Audio and Video Tape Recorders
Studio to Transm itter Links
Digital Audio Signal Routers/ Sw itches
Digital Audio Broadcast Equipm ent
High Quality D/ A Converters
T he input and output control signals allow for considerable flex-
ibility 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 justified to the left/right
clock edge, or delayed by one bit clock from the left/right clock
edge. Input and output data can also be independently justified
to the word clock rising edge or delayed by one bit clock from
the word clock rising edge. T he bit clocks can also be indepen-
dently configured for rising edge active or falling edge active
operation.
Digital Tape Recorder Varispeed Applications
Com puter Com m unication and Multim edia System s
P RO D UCT O VERVIEW
The AD1890 and AD1891 SamplePorts™ are fully digital, stereo
Asynchronous Sample Rate Converters (ASRCs) that solve sample
rate interfacing and compatibility problems in digital audio equip-
ment. Conceptually, these converters interpolate the input data up
to a very high internal sample rate with a time resolution of 300 ps,
then decimate down to the desired output sample rate. T he
AD1890 is intended for 18- and 20-bit professional applications,
and the AD1891 is intended for 16-bit lower cost applications
where large dynamic sample-rate changes are not encountered.
These devices are asynchronous because the frequency and phase
relationships between the input and output sample clocks (both are
inputs to the AD1890/AD1891 ASRCs) 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 AD1890/AD1891 automatically sense the relationship between
T he AD1890/AD1891 SamplePort™ ASRCs have on-chip digi-
tal coefficients that correspond to a highly oversampled 0 kHz to
20 kHz low-pass filter with a flat passband, a very narrow tran-
sition band, and a high degree of stopband attenuation. A subset
of these filter coefficients are dynamically chosen on the basis of
the filtered instantaneous ratio between the input sample clock
(LR_I) and the output sample clock (LR_O), and these coeffi-
cients are used in an FIR convolver to perform the sample rate
conversion. Refer to the “T heory of Operation” section of this
data sheet for a more thorough functional description. T he low-
pass filter has been designed so that full 20 kHz bandwidth is
maintained when the input and output sample clock frequencies
are as low as 44.1 kHz. If the output sample rate drops below
the input sample rate, the bandwidth of the input signal is
SamplePort and SamplePorts are trademarks of Analog Devices, Inc.
(continued on Page 4)
REV. 0
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
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