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Analog Devices Semiconductor Electronic Components Datasheet

AD1893 Datasheet

Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter

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AD1893 pdf
a
Low Cost SamplePort®
16-Bit Stereo Asynchronous
Sample Rate Converter
AD1893
FEATURES
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
Approximately 1:2 to 2:1 Ratio Between Sample
Clocks
–96 dB THD+N at 1 kHz
96 dB Dynamic Range
Optimal Clock Tracking Control—Slow/Fast Settling
Modes
Linear Phase in All Modes
Automatic Output Mute
Flexible Four-Wire Serial Interfaces with Right-Justified
Mode
Power-Down Mode
On-Chip Oscillator
APPLICATIONS
Consumer CD-R, DAT, DCC, MD and 8 mm Video Tape
Recorders Including Portables
Digital Audio Communication/Network Systems
Computer Multimedia Systems
PRODUCT OVERVIEW
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. Concep-
tually, this converter interpolates the input data up to a very high
internal sample rate with a time resolution of 300 ps, then deci-
mates down to the desired output sample rate. The AD1893 is
intended for 16-bit low cost, non-varispeed applications where low
voltage, low power (i.e., battery-powered) operation is required.
Refer to the AD1890/AD1891 data sheet for other products in the
SamplePort family. This device is asynchronous because the fre-
quency 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 fre-
quencies can nominally range from 8 kHz to 56 kHz, and the ratio
between them can vary from approximately 1:2 to 2:1.
SamplePort is a registered trademark of Analog Devices, Inc.
REV. A
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.
SYSTEM DIAGRAM
EXAMPLE
FREQUENCIES:
DAT 48kHz OR
CD 44.1kHz OR
BROADCAST 32kHz
INPUT SAMPLE CLOCK
INPUT SERIAL DATA
AD1893
EXAMPLE
FREQUENCIES:
DAT 48kHz OR
CD 44.1kHz OR
BROADCAST 32kHz
OUTPUT SAMPLE CLOCK
OUTPUT SERIAL DATA
The AD1893 uses multirate digital signal processing techniques
to construct an output sample stream from the input sample
stream. The input word width is 4 to 16 bits for the AD1893.
Shorter input words are automatically zero-filled in the LSBs.
The output word width is 24 bits. The user can receive as many
of the output bits as desired. Internal arithmetic is performed
with 22-bit coefficients and 27-bit accumulation. The digital
samples are processed with unity gain.
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
bit clocks can also be independently configured for rising edge
active or falling edge active operation.
The AD1893 SamplePort ASRC has on-chip digital coefficients
that correspond to a highly oversampled 0 Hz to 20 kHz low-
pass filter with a flat passband, a very narrow transition band,
and a high degree of stopband attenuation. A subset of these
filter coefficients are dynamically chosen on the basis of the
filtered ratio between the input sample clock (LR_I) and the
output sample clock (LR_O), and these coefficients are then
used in an FIR convolver to perform the sample rate conversion.
Refer to the Theory of Operation section of this data sheet for a
more thorough functional description. The 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 automatically
(continued on Page 4)
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., 1998


Analog Devices Semiconductor Electronic Components Datasheet

AD1893 Datasheet

Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter

No Preview Available !

AD1893 pdf
AD1893–SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED
Supply Voltage
+3.0 V
Ambient Temperature
25
°C
Crystal Frequency
16 MHz
Load Capacitance
100 pF
All minimums and maximums tested except as noted.
PERFORMANCE1 (Guaranteed for VDD = +3.3 V to +5.0 V ± 10%)
Dynamic Range (20 Hz to 20 kHz, –60 dB Input)
Total Harmonic Distortion + Noise
(20 Hz to 20 kHz, Full-Scale Input, FSOUT/FSIN Between 0.51 and 1.99)
(1 kHz Full-Scale Input, FSOUT/FSIN Between 0.7 and 1.4)
(10 kHz Full-Scale Input, FSOUT/FSIN Between 0.7 and 1.4)
Interchannel Phase Deviation
Input and Output Sample Clock Jitter
(For 1 dB Degradation in THD+N with 10 kHz Full-Scale Input, Slow-Settling Mode)
Min
96
10
DIGITAL INPUTS (Guaranteed for VDD = +3.0 V to +5.0 V ± 10%)
VIH
VIL (VDD +3.0 V)
VIL (+2.7 V VDD < +3.0 V)
IIH @ VIH = +5.0 V, All Pins Except XTAL_I
IIH @ VIH = +5.0 V, XTAL_I Pin
IIL @ VIL = 0 V, All Pins Except XTAL_I
IIL @ VIL = 0 V, XTAL_I Pin
VOH @ IOH = –4 mA (VDD +3.0 V)
VOH @ IOH = –4 mA (+2.7 V VDD < +3.0 V)
VOL @ IOL = 4 mA
Input Capacitance1
Min
2.0
2.4
2.2
DIGITAL TIMING (Guaranteed for VDD = +3.0 V to +5.0 V ± 10%) See Figures 26 through 28.
Min
tCRYSTAL
FCRYSTAL
tPWL
tPWH
FLRI
tRPWL
tRS
tBCLK
FBCLK
tBPWL
tBPWH
tWSI
tWSO
tLRSI
tLRSO
tDS
tDH
tDPD
tDOH
Crystal Period
Crystal Frequency (1/tCRYSTAL)
Crystal LO Pulsewidth
Crystal HI Pulsewidth
LR_I Frequency with 16 MHz Crystal1
RESET LO Pulsewidth
RESET Setup to Crystal Falling
BCLK_I/O Period1
BCLK_I/O Frequency (l/tBCLK)1
BCLK_I/O LO Pulsewidth
BCLK_I/O HI Pulsewidth
WCLK_I Setup to BCLK_I
WCLK_O Setup to BCLK_O
LR_I Setup to BCLK_I
LR_O Setup to BCLK_O
Data Setup to BCLK_I
Data Hold from BCLK_I
Data Propagation Delay from BCLK_O
Data Output Hold from BCLK_O
62.5
20
20
10
125
15
120
55
55
15
40
15
55
0
35
15
Max
–94
–96
–95
0
Max
0.8
0.7
4
6
4
6
0.4
15
Max
125
16
56
8.33
90
Units
dB
dB
dB
dB
Degrees
ns
Units
V
V
V
µA
µA
µA
µA
V
V
V
pF
Units
ns
MHz
ns
ns
kHz
ns
ns
ns
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
–2– REV. A


Part Number AD1893
Description Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter
Maker Analog Devices
Total Page 20 Pages
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