AD1896YRS Analog Devices, AD1896YRS Datasheet

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AD1896YRS

Manufacturer Part Number
AD1896YRS
Description
192kHz stereo asynchronous sample rate converter. For home theater systems, studio digital mixers, automotive audio systems, DVD
Manufacturer
Analog Devices
Datasheet

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AD1896YRS
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20 000
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a
PRODUCT OVERVIEW
The AD1896 is a 24-bit, high-performance, single-chip, second-
generation asynchronous sample rate converter. Based upon
Analog Devices Inc. experience with its first asynchronous
sample rate converter, the AD1890, the AD1896 offers improved
performance and additional features. This improved performance
includes a THD + N range of –117 dB to –133 dB depending
on sample rate and input frequency, 142 dB (A-Weighted)
dynamic range, 192 kHz sampling frequencies for both input and
output sample rates, improved jitter rejection, and 1:8 upsampling
and 7.75:1 downsampling ratios. Additional features include
more serial formats, a bypass mode, better interfacing to digital
signal processors, and a matched phase mode.
The AD1896 has a 3-wire interface for the serial input and
output ports that supports left-justified, I
(16-, 18-, 20-, 24-bit) modes. Additionally, the serial output
Patents pending.
2
S, and right-justified
port supports TDM mode for daisy chaining multiple AD1896’s to
a digital signal processor. The serial output data is dithered down
to 20, 18 or 16 bits when 20-, 18- or 16-bit output data is selected.
The AD1896 sample rate converts the data from the serial input
port to the sample rate of the serial output port. The sample rate
at the serial input port can be asynchronous with respect to the
output sample rate of the output serial port. The master clock to
the AD1896, MCLK, can be asynchronous to both the serial
input and output ports.
MCLK can either be generated off-chip or on-chip by the AD1896
master clock oscillator. Since MCLK can be asynchronous to the
input or output serial ports, a crystal can be used to generate
MCLK internally to reduce noise and EMI emissions on the
board. When MCLK is synchronous to either the output or input
serial port, the AD1896 can be configured in a master mode where
MCLK is divided down and used to generate the left/right
and bit clocks for the serial port that is synchronous to MCLK.
The AD1896 supports master modes of 256 × f
768 × f
Conceptually, the AD1896 interpolates the serial input data by
a rate of 2
output sample rate. In practice, a 64-tap FIR filter with 2
polyphases, a FIFO, a digital servo loop that measures the time
difference between input and output samples within 5 ps, and a
digital circuit to track the sample rate ratio are used to perform
the interpolation and output sampling. Refer to the Theory of
Operation section. The digital servo loop and sample rate ratio
circuit automatically track the input and output sample rates.
SMODE_IN_0
SMODE_IN_1
SMODE_IN_2
LRCLK_I
MUTE_O
192 kHz Stereo Asynchronous
SDATA_I
BYPASS
MUTE_I
SCLK_I
S
for both input and output serial ports.
MCLK_I
20
and samples the interpolated data stream by the
FUNCTIONAL BLOCK DIAGRAM
MCLK_O
SERIAL
INPUT
CLOCK DIVIDER
Sample Rate Converter
MSMODE_0
GRPDLYS
MSMODE_1
DIGITAL
FIFO
PLL
MSMODE_2
RESET
FILTER
FS
ROM
FS
FIR
OUT
IN
VDD_IO VDD_CORE
AD1896
AD1896
OUTPUT
SERIAL
(Continued on page 15)
S
, 512 × f
WLNGTH_O_0
WLNGTH_O_1
SMODE_O_0
SMODE_O_1
TDM_IN
SDATA_O
SCLK_O
LRCLK_O
S
20
and

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AD1896YRS Summary of contents

Page 1

... PRODUCT OVERVIEW The AD1896 is a 24-bit, high-performance, single-chip, second- generation asynchronous sample rate converter. Based upon Analog Devices Inc. experience with its first asynchronous sample rate converter, the AD1890, the AD1896 offers improved performance and additional features. This improved performance includes a THD + N range of –117 dB to –133 dB depending ...

Page 2

AD1896–SPECIFICATIONS TEST CONDITIONS UNLESS OTHERWISE NOTED Supply Voltages VDD_CORE 3.3 V VDD_IO 5 3.3 V Ambient Temperature 25°C Input Clock 30.0 MHz Input Signal 1.000 kHz, 0 dBFS Measurement Bandwidth S_OUT Word Width 24 Bits ...

Page 3

DIGITAL TIMING (–40 C < T < +105 C, VDD_CORE = 3 Parameter t MCLK_I Period MCLKI f MCLK_I Frequency MCLK t MCLK_I Pulsewidth High MPWH t MCLK_I Pulsewidth Low MPWL Input Serial Port Timing t LRCLK_I ...

Page 4

AD1896–SPECIFICATIONS DIGITAL FILTERS (VDD_CORE = 3.3 V Parameter Passband Passband Ripple Transition Band Stop Band Stop Band Attenuation Group Delay Specifications subject to change without notice. DIGITAL I/O CHARACTERISTICS (VDD_CORE = 3.3 V Parameter Input Voltage ...

Page 5

... Model Temperature Range AD1896YRS –40°C to +105°C AD1896YRSRL –40°C to +105°C CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD1896 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges ...

Page 6

AD1896 Pin No. IN/OUT Mnemonic 1 IN GRPDLYS 2 IN MCLK_IN 3 OUT MCLK_OUT 4 IN SDATA_I 5 IN/OUT SCLK_I 6 IN/OUT LRCLK_I 7 IN VDD_IO 8 IN DGND 9 IN BYPASS 10 IN SMODE_IN_0 11 IN SMODE_IN_1 12 IN ...

Page 7

FREQUENCY – kHz 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 –200 2.5 5.0 7.5 10.0 12.5 15.0 17.5 FREQUENCY ...

Page 8

AD1896 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 –200 2.5 5.0 7.5 10.0 12.5 FREQUENCY – kHz –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 –180 –190 –200 2.5 5.0 7.5 10.0 ...

Page 9

FREQUENCY – kHz –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 –180 ...

Page 10

AD1896 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 –200 FREQUENCY – kHz 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 –200 2.5 5.0 7.5 10.0 12.5 15.0 FREQUENCY – kHz ...

Page 11

OUTPUT SAMPLE RATE – kHz –119 –121 –123 –125 –127 –129 –131 –133 –135 105 130 155 OUTPUT SAMPLE RATE – kHz ...

Page 12

AD1896 –130 –131 –132 –133 –134 –135 –136 –137 –138 –139 –140 105 130 OUTPUT SAMPLE RATE – kHz 0 –20 –40 192kHz:96kHz –60 192kHz:48kHz –80 –100 192kHz:32kHz –120 –140 FREQUENCY – kHz ...

Page 13

INPUT LEVEL – dBFS –1 –2 –3 –4 –5 – – ...

Page 14

AD1896 –110 –115 –120 –125 –130 –135 –140 –145 –150 –155 –160 –165 –170 –175 –180 –140 –120 –100 –80 –60 INPUT LEVEL – dBFS –110 –115 –120 –125 –130 –135 –140 –145 –150 –155 –160 –165 –170 –175 –180 ...

Page 15

FREQUENCY – kHz –110 –115 –120 –125 –130 –135 –140 –145 –150 –155 –160 –165 –170 –175 –180 2.5 5.0 ...

Page 16

AD1896 ASRC FUNCTIONAL OVERVIEW THEORY OF OPERATION Asynchronous sample rate conversion is converting data from one clock source at some sample rate to another clock source at the same or different sample rate. The simplest approach to asynchronous sample rate ...

Page 17

IN INTERPOLATE LOW-PASS BY N FILTER f S_IN FREQUENCY DOMAIN OF SAMPLES AT f FREQUENCY DOMAIN OF THE INTERPOLATION SIN(X)/X OF ZERO-ORDER HOLD FREQUENCY DOMAIN OF f RESAMPLING S_OUT FREQUENCY DOMAIN AFTER RESAMPLING HARDWARE MODEL The output rate of the ...

Page 18

AD1896 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 –150 –160 –170 –180 –190 –200 –210 –220 0.01 0.1 The digital servo loop is essentially a ramp filter that provides the initial ...

Page 19

However, the hysteresis of the f /f S_OUT S_IN phase mismatching between two AD1896s operating with the same input clock and the same output clock. Since the hyster- esis requires a difference of more than two ratio ...

Page 20

AD1896 AD1896 MCLK_I C1 AD1896 MCLK_I MCLK_O There are, of course, maximum and minimum operating fre- quencies for the AD1896 master clock. The maximum master clock frequency at which the AD1896 is guaranteed to operate ...

Page 21

... AD1896 SDATA_O TDM_IN LRCLK_O SCLK_O PHASE-MASTER SHARC is a registered trademark of Analog Devices, Inc. LEFT CHANNEL MSB MSB LSB LEFT JUSTIFIED MODE – BITS PER CHANNEL LEFT CHANNEL MSB LSB MSB MODE – BITS PER CHANNEL ...

Page 22

AD1896 AD1896 TDM_IN SDATA_O LRCLK_O SCLK_O CLOCK-MASTER AND PHASE-MASTER MATCHED PHASE MODE (NON-TDM MODE) APPLICATION LRCLK ( S_IN SCLK I AD1896 PHASE-MASTER TDM_IN SDATA_I SDATA_O LRCLK_I LRCLK_O SCLK_O SCLK_I MCLK RESET M2 ...

Page 23

Matched-Phase Mode The matched-phase mode is the mode discussed in the Theory of Operation section that eliminates the phase mismatch between multiple AD1896s. The master AD1896 device transmits its f /f ratio through the SDATA_O pin to the slave S_OUT ...

Page 24

AD1896 PIN 1 0.079 (2.00) MAX 0.002 (0.05) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead Shrink Small Outline Package (SSOP) (RS-28) 0.413 (10.50) 0.402 (10.20) 0.390 (9.90 0.220 (5.60) 0.209 (5.30) 0.197 (5.00) 0.323 (8.20) 0.307 ...

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