AD1893_15 datasheet(4/20 Pages) AD

Part #	AD1893

Description	Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter

Download	20 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

4 / 20 page

AD1893

–4–

REV. A

(continued from Page 1)

PRODUCT OVERVIEW (Continued)

limited to avoid alias distortion on the output signal. The

AD1893 dynamically alters the low-pass filter cutoff frequency

smoothly and slowly, so that real-time variations in the sample

rate ratio are possible without degradation of the audio quality.

The AD1893 has a pin selectable slow- or fast-settling mode.

This mode determines how quickly the ASRC adapts to a

change in either the input sample clock frequency (FSIN) or the

output sample clock frequency (FSOUT). In the slow-settling

mode, the control loop which computes the ratio between FSIN

and FSOUT settles in approximately 800 ms and begins to reject

jitter above 3 Hz. The slow-settling mode offers the best signal

quality and the greatest jitter rejection. In the fast-settling mode,

the control loop settles in approximately 200 ms and begins to

reject jitter above 12 Hz. The fast-settling mode allows rapid,

real time sample rate changes to be tracked without error, at the

expense of some narrowband noise modulation products on the

output signal.

The AD1893 features short group delay processing. This feature

relates to the depth of the First-In, First-Out (FIFO) memory,

which buffers the input data samples before they are processed

by the FIR convolver. In the AD1893, the group delay is

approximately 700

µs. If the read and write pointers that

manage the FIFO cross (indicating underflow or overflow), the

AD1893 asserts the mute output (MUTE_O) pin HI for 128

output clock cycles. If MUTE_O is connected to the mute input

(MUTE_I) pin, as it normally should be, the serial output will

be muted (i.e., all bits zero) during this transient event.

The AD1893 includes an on-chip oscillator that only requires

the user provide an external crystal. By removing the need for

an external oscillator, the AD1893 lowers the total cost of own-

ership to the end user. The AD1893 also includes a power-

down mode, which is invoked with the PWRDWN pin.

Asserting this control signal HI will place the AD1893 into a

very low power dissipation in active and standby condition.

The AD1893 is fabricated in a 0.8

µm single poly, double metal

CMOS process and are packaged in a 0.6" wide 28-lead plastic

DIP and a 10 mm by 10 mm body size 44-lead LQFP. The

AD1893 operates from a +3 V to +5 V power supply over the

temperature range of 0

°C to +70°C.

DEFINITIONS

Dynamic Range

The ratio of a near full-scale input signal to the integrated noise

in the passband (0 kHz to

≈20 kHz), expressed in decibels (dB).

Dynamic range is measured with a –60 dB input signal and

“60 dB” arithmetically added to the result.

Total Harmonic Distortion + Noise

Total Harmonic Distortion plus Noise (THD+N) is defined as

the ratio of the square root of the sum of the squares of the values

of the harmonics and noise to the rms value of a sinusoidal

input signal. It is usually expressed in percent (%) or decibels.

Interchannel Phase Deviation

Difference in input sampling times between stereo channels,

expressed as a phase difference in degrees between 1 kHz inputs.

Group Delay

Intuitively, the time interval required for a full-level input pulse

to appear at the converter’s output, at full level, expressed in

milliseconds (ms). More precisely, the derivative of radian

phase with respect to radian frequency at a given frequency.

Transport Delay

The time interval between when an impulse is applied to the

converter’s input and when the output starts to be affected by

this impulse, expressed in milliseconds (ms). Transport delay is

independent of frequency.

Similar Part No. - AD1893_15

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD1893JN	216Kb / 20P	Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter REV. A
Analog Devices	AD1893JST	216Kb / 20P	Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter REV. A

More results

Similar Description - AD1893_15

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD1893	216Kb / 20P	Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter REV. A
	AD1890	416Kb / 20P	SamplePort Stereo Asynchronous Sample Rate Converters REV. 0
	AD1890	419Kb / 20P	SamplePort Stereo Asynchronous Sample Rate Converters REV. 0
	AD1891	419Kb / 20P	SamplePort Stereo Asynchronous Sample Rate Converters REV. 0
	AD1895	1Mb / 24P	192 kHz Stereo Asynchronous Sample Rate Converter REV. B
	AD1896	1Mb / 28P	192 kHz Stereo Asynchronous Sample Rate Converter REV. A
Texas Instruments	SRC4190-Q1	1Mb / 29P	[Old version datasheet] 192-kHz STEREO ASYNCHRONOUS SAMPLE-RATE CONVERTER
Analog Devices	AD1896	1Mb / 28P	192 kHz Stereo Asynchronous Sample Rate Converter REV. A
	AD1896AYRSZ	1Mb / 28P	192 kHz Stereo Asynchronous Sample Rate Converter REV. A
	AD1895	860Kb / 24P	192 kHz Stereo Asynchronous Sample Rate Converter REV. B

More results

AD1893 Datasheet(PDF) 4 Page - Analog Devices

AD1893 Datasheet(HTML) 4 Page - Analog Devices

Similar Part No. - AD1893_15

Similar Description - AD1893_15

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Datasheet Download

Link URL