CRD5381_技术文档

CRD5381

Audio A/D Converter w/ Asynchronous Decimation Filter

Reference Design

Features

Analog Performance

System Features

Advanced Multi-bit Delta-sigma Architecture

24-bit Conversion

Output Sample Rate Determined by Input

Word, Left/Right, or Fsync Clock

No External Master Clock Required

Easily Scalable for Additional Channels

Sample Rates from 27 kHz to 192 kHz

120 dB Dynamic Range

-110 dB THD+N

Performance insensitivity to Input Clock Jitter

Four-Channel Time-Division Multiplexed

Output

Digital Filter Characteristics

Two Independent Stereo, Left-Justified

125 dB Stop-band Rejection

Phase-Matched Outputs

Outputs

CS5381 A

CS8421 A

LEFT

SDOUT

SDIN

SDOUT

Quad Speed

Master Input

RIGHT

Slave Mode

Slave Ouput

2

TDM ENABLE

SDOUT A

Differential Analog

Inputs 1-4

PCM Data Ouput/

Serial Clock Input

Header, J4

TDM/SDOUT B

2

LRCK INPUT SCLK INPUT

TDM IN

LEFT

CS5381 B

Quad Speed

Slave Mode

CS8421 B

Master Input

Slave Output

SDOUT

SDIN

SDOUT

RIGHT

MAY ‘05

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http://www.cirrus.com

CRD5381

Description

The combination of the CS5381 Analog-to-Digital Converter and CS8421 Asynchronous Sample Rate Converter

creates an analog-to-digital conversion system with an asynchronous digital decimation filter that is virtually

immune to interface or network jitter. In addition, the CS8421 adds a multi-channel Time Division Multiplexed

(TDM) output format option. These unique features address many of the issues and design challenges associated

with networked audio systems and other high-performance applications. In addition to the standard 24-bit audio

data, the CS8421 adds the functionality to output properly dithered 32, 20, or 16-bit data.

The CRD5381 was designed as a platform for easy evaluation of the jitter rejection, sample rate conversion, and

time-division multiplexing capabilities of the CS8421 in the context of a A/D conversion system with an asynchro-

nous decimation filter. The CRD5381 accepts four channels of balanced, analog audio input and provides four

channels of PCM data output. The data output can be either a four-channel TDM format or two independent stereo

left-justified data outputs. The PCM data output is synchronous to the serial left-right clock and bit clock that the user

supplies. The CRD5381 also provides status indicators including ADC overflow and SRC unlock, and it accepts an

external reset signal. The only system power requirements for the design include +/- 12 Volts and +3.3 Volts. The

required input signals are a left/right or word clock and serial clock for the audio data output.

This document includes operational instructions and schematics for the CRD5381 and is a companion document to

the Cirrus Logic applications note AN270, “Audio A/D conversion with Asynchronous Decimation Filter” [1]. Please

also refer to the CS5381 and CS8421 data sheets for specific product information and specifications [2,3]. Both doc-

uments, as well as AN270, are available online at http://www.cirrus.com

The CRD5381 schematic set is shown in Figures 9 through 14 and the board layout is shown in Figures 15

through 19. A block diagram of the CRD5381 is shown in Figure 8.

ORDERING INFORMATION

Product

Description

Order#

CRD5381

Audio A/D Converter w/ Asynchronous Decimation Filter Reference Design

CRD5381

2

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CRD5381

TABLE OF CONTENTS

1. SYSTEM OVERVIEW ................................................................................................................ 4

1.1 Sample Clock Domain ....................................................................................................... 4

1.1.1 CS8421 Input Operational Mode .......................................................................... 4

1.1.2 CS5381 Operational Mode ................................................................................... 4

1.1.3 Master Clock Frequency Generation .................................................................... 4

1.1.4 Maximum Sample Rate ......................................................................................... 4

1.1.5 Synchronization of Multiple Sections .................................................................... 4

1.2 CS8421 Output and the Interface Clock Domain .............................................................. 5

1.2.1 CS8421 Output System Clocking ......................................................................... 5

1.2.2 Serial Audio Output Port Options and Selection of Data Resolution and Dither ... 5

1.2.3 Clocking ................................................................................................................ 5

1.2.4 SRC Locking and Varispeed ................................................................................. 5

1.2.5 Latency or Group Delay ........................................................................................ 6

1.2.6 Phase Matching Between Multiple Sections ......................................................... 6

1.3 Filter Response ................................................................................................................. 7

2. OPERATION .............................................................................................................................. 9

2.1 Sample Rate ...................................................................................................................... 9

2.2 Audio Data Output Format Selection ................................................................................. 9

2.3 System Clocking and Data I/O .......................................................................................... 9

2.4 System Status Indicators ................................................................................................. 10

2.5 System Reset .................................................................................................................. 10

2.6 Analog Inputs ................................................................................................................... 11

2.7 Power .............................................................................................................................. 11

2.8 Grounding and Power Supply Decoupling ....................................................................... 11

3. BLOCK DIAGRAM .................................................................................................................. 12

4. SCHEMATICS ......................................................................................................................... 13

5. LAYOUT .................................................................................................................................. 19

6. REFERENCES ......................................................................................................................... 24

7. REVISION HISTORY ............................................................................................................... 24

LIST OF FIGURES

Figure 1. Transitional Band, 48 kHz Out......................................................................................... 7

Figure 2. Transitional Band, 96 kHz Out......................................................................................... 8

Figure 3. Transitional Band, 192 kHz Out....................................................................................... 8

Figure 4. Left-Justified Serial Audio Interface ................................................................................. 9

Figure 5. TDM Audio Interface........................................................................................................ 9

Figure 6. Clock and Data Header Connections, J4....................................................................... 10

Figure 7. Status Indicator and Reset Header, J16........................................................................ 11

Figure 8. Block Diagram................................................................................................................ 12

Figure 9. Analog Inputs 1 & 2........................................................................................................ 13

Figure 10. Analog Inputs 3 & 4...................................................................................................... 14

Figure 11. CS5381 & CS8421 Pair A............................................................................................ 15

Figure 12. CS5381 & CS8421 Pair B............................................................................................ 16

Figure 13. I/O Header and Miscellaneous..................................................................................... 17

Figure 14. Power........................................................................................................................... 18

Figure 15. Silk Screen................................................................................................................... 19

Figure 16. Top Layer..................................................................................................................... 20

Figure 17. Bottom Layer................................................................................................................ 21

Figure 18. Power Plane................................................................................................................. 22

Figure 19. Ground Plane............................................................................................................... 23

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CRD5381

1. SYSTEM OVERVIEW

1.1

Sample Clock Domain

1.1.1

CS8421 Input Operational Mode

Serial Audio Interface - Left-Justified. The selection of the serial audio interface format is arbitrary, assuming

the serial input format of the CS8421 is in agreement with the serial output format of the CS5381. The se-

lection of the serial audio format is done by connecting a resistor (1.96 kΩ in this application) to either ground

or the VL supply.

System Clocking - Master mode, LRCK = MCLK/128. In this mode, the CS8421 generates the Serial and

Left/Right clocks within the sampling clock domain. This mode is selected by the resistor connected to the

MS_SEL pin of the CS8421. In this application the MS_SEL pin is connected to ground (equivalent to con-

necting a 1 kΩ resistor to ground).

1.1.2

CS5381 Operational Mode

Serial Audio Interface - Left-Justified. The selection of the serial audio interface format is arbitrary, assuming

the input format of the CS8421 is in agreement with the output format of the CS5381.

System Clocking - Slave mode. In this application the CS8421 generates the serial and Left/Right clocks

within the sampling clock domain.

Operational Mode or Sample Rate Range - Configured for Quad-Speed Mode to support sample rates

above 100 kHz.

High Pass Filter - Enabled

Master Clock Divide - Enabled to divide the master clock by 2.

1.1.3

Master Clock Frequency Generation

The CS8421 uses the clock supplied through its XTI pin as its master clock (MCLK). The CS5381 also uses

this signal as its master clock (through the MCLK pin). Alternatively, the CS8421 can generate a master

clock (via the MCLK_OUT pin) by connecting a crystal across its XTI-XTO pins, which can supply a MCLK

to the CS5381.

In this application, MCLK_OUT pin is not being used and is pulled high through a 47 kΩ resistor to VL to

disable it. If a crystal is not being used, as with the crystal oscillator in this application, XTO should be left

unconnected or pulled low through a 47 kΩ resistor to ground.

1.1.4

1.1.5

4

Maximum Sample Rate

The maximum sample rate is limited by the maximum allowable master clock frequency of the CS8421,

which is 27 MHz. The sample rate is this clock frequency divided by 128. This corresponds to a maximum

sample rate of 210.937 kHz within the sample clock domain. In this application, we have chosen a master

clock frequency of 25 MHz, which corresponds to a sample rate of approximately 195.312 kHz

Synchronization of Multiple Sections

In this application multiple CS8421 inputs are set to master mode, and it is important that their serial ports

be aligned in time, with minimum possible phase error. To achieve this, their reset signals are tied together

and routed for minimum skew. The amount of deviation between ILRCKs generated by the respective parts

is typically either 0 or 1 master clock period, or between 0 and 40 ns.

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CRD5381

1.2

CS8421 Output and the Interface Clock Domain

1.2.1

CS8421 Output System Clocking

The CS8421 serial output is configured as a system clock slave. The advantages are:

•

Output sample rate is dependent on the frequency of the incoming word clock (OLRCK), set by the user.

Outputs of multiple CS8421 devices are synchronous.

Multiple devices can be configured in a Time Division Multiplexed (TDM) multi-channel interface format.

As mentioned in “CS8421 Input Operational Mode” on page 4, the input of the CS8421 is configured as a

master, with the master clock frequency = 128*Fsi (or ILRCK). To accommodate this serial input mode, and

to set the serial output to slave, the MS_SEL pin is connected to +3.3 V.

1.2.2

1.2.3

1.2.4

Serial Audio Output Port Options and Selection of Data Resolution and Dither

The CS8421 provides multiple options for the serial audio output port. These options include:

•

Output Data Format of Left-Justified, Right-Justified, I²S or TDM

Audio output data resolution of the SRC can be set to 16, 20, 24, or 32-bits. Dithering is applied and is

automatically scaled to the selected output word length. This dither is not correlated between left and

right channels.

Output word-length and serial data format are selected with either a pull-up or pull down resistor connected

to the SAOF pin of the CS8421. Please refer to Table 3 in the CS8421 data sheet for details [3].

The serial audio output of the CRD5381 is configured to operate in either dual 24-bit Left-Justified formats

or a 4-channel 24-bit TDM output.

Clocking

In order to ensure proper operation of the CS8421, the clock or crystal attached to XTI must simultaneously

satisfy the requirements of LRCK for both the input and output as follows:

•

If the input is set to master, Fsi ≤ XTI/128 and Fso ≤ XTI/130.

If the output is set to master, Fso ≤ XTI/128 and Fsi ≤ XTI/130.

If both input and output are set to slave, XTI ≥ 130*[maximum(Fsi,Fso)], XTI/Fsi < 3750, and XTI/Fso <

3750.

In the example application in this data sheet, the input serial port is set to master, and generates serial

clocks for a sampling rate of XTI/128. The output serial port is set as slave, and can receive a left-right clock

that is ≤ XTI/130. The serial bit-clock frequency is always 64*left-right clock.

SRC Locking and Varispeed

The SRC calculates the ratio between the input sample rate and the output sample rate, and uses this in-

formation to set up various parameters inside the SRC block. The SRC takes approximately 4200/Fso

(8.75 ms at Fso of 48 kHz) to make this calculation.

The SRC_UNLOCK pin is used to indicate when the SRC is not locked. When RST is asserted, or if there

is a change in Fsi or Fso, SRC_UNLOCK will be set high. The SRC_UNLOCK pin will continue to be high

until the SRC has reacquired lock and settled, at which point it will transition low. When the SRC_UNLOCK

pin is set low, SDOUT is outputting valid audio data. This can be used to signal a DAC to un-mute its output.

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CRD5381

1.2.5

Latency or Group Delay

The system latency, or group delay, is the sum of the CS5381 group delay and the CS8421 group delay.

The latency of the CS5381 is 5 samples (5/Fs), and the latency of the CS8421 depends on input and output

sample rates, and can be found in the CS8421 data sheet [3]. Table 1 shows the combined group delay for

typical output sample rates with a fixed input sampling rate of 195.3125 kHz.

.

Output Sample Rate

48 kHz

Group Delay

1.48 ms

96 kHz

.895 ms

192 kHz

.605 ms

Table 1. System Latency

1.2.6

Phase Matching Between Multiple Sections

This phase delay is equal across multiple parts. Therefore, when multiple parts operate at the same Fsi and

Fso and use a common XTI/XTO clock, their output data is phase matched.

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CRD5381

1.3

Filter Response

The transition-band response of the CRD5381 is due to the combination of the digital filtering performed by both the

CS5381 and the CS8421. Due to the superior stop-band rejection of the CS8421, the combination of the two parts

yields a better stop-band rejection then the CS5381 alone. When the output sample rate is close to that of the

CS5381, signals that fall within the transition-band spectrum will already have been aliased down into the pass-band

prior to the CS8421’s output filter. This can be seen in Figure 3 on page 8, where the signals above the notch at

approximately 97.5 kHz represent signals that have been aliased downward prior to the action of the CS8421 output

filter.

+0

-5

-10

-15

-20

-25

-30

-35

-40

-45

-50

-55

d

B

F

-60

S

-65

-70

-75

-80

-85

-90

-95

-100

-105

-110

-115

-120

20k

20.5k

21k

21.5k

22k

22.5k

23k

Hz

23.5k

24k

24.5k

25k

25.5k

26k

Figure 1. Transitional Band, 48 kHz Out

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CRD5381

+0

-5

-10

-15

-20

-25

-30

-35

-40

-45

-50

-55

d

B

F

S

-60

-65

-70

-75

-80

-85

-90

-95

-100

-105

-110

-115

-120

40k

41k

42k

43k

44k

45k

46k

Hz

47k

48k

49k

50k

51k

52k

Figure 2. Transitional Band, 96 kHz Out

+0

-5

-10

-15

-20

-25

-30

-35

-40

-45

-50

-55

-60

-65

-70

-75

-80

d

B

F

S

40k

50k

60k

70k

80k

90k

100k

110k

120k

130k

140k

150k

Hz

Figure 3. Transitional Band, 192 kHz Out

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2. OPERATION

2.1

Sample Rate

Sampling Clock Domain - The Sampling clock domain includes the CS5381 A/D converter and the serial

audio input to the CS8421 SRC. The sampling frequency in this clock domain is dictated by the ILRCK fre-

quency of each CS8421, and is derived from the system master clock Y2. The sample rate within this clock

domain is fixed at 195.312 kHz.

Interface Clock Domain - The Interface clock domain includes the output of the CS8421 SRC. The sample

rate of this domain is dictated by the frequency of the Left/Right or Word clock. This signal is an input to the

system and must be applied by the user through header J4.

2.2

Audio Data Output Format Selection

The CRD5381 allows selection of either a standard Left-Justified 3-wire serial audio interface with sepa-

rate data lines for each ADC / SRC pair or a 4-channel TDM interface. Selection of either mode is accom-

plished via jumper J8. The two possible serial audio output formats are shown in Figures 4 and 5.

Channel A

Channel B

LRCK INPUT

SCLK INPUT

SDOUT

MSB

LSB

MSB

LSB

MSB

Figure 4. Left-Justified Serial Audio Interface

LRCK

INPUT

SCLK

INPUT

TDM/

SDOUT B

MSB

SDOUT B (Left)

32 clks

SDOUT B (Right)

32 clks

SDOUT A (Left)

32 clks

SDOUT A (Right)

32 clks

Figure 5. TDM Audio Interface

2.3

System Clocking and Data I/O

Serial Clock - The Serial Clock must be applied by the user through header J4 in both Left-Justified and

TDM mode. In TDM mode, Serial Clock must be 128*Left/Right Clock.

Left /Right or Word Clock - The Left/Right Clock must be applied by the user through header J4 in both

Left-Justified and TDM mode. The output sample rate is determined by the frequency of this clock.

Serial Data Output - The serial data is output on J4. Separate stereo data outputs are available as

SDOUT A and TDM/SDOUT B when the Left-Justified format is selected. Four-channel TDM data is avail-

able on TDM/SDOUT B (J4) when the TDM mode is selected.

Figure 4 and Figure 5 illustrate Left-Justified and TDM data structures. Please refer to the “Slave Mode

Switching Specifications” on page 8 of the CS8421 data sheet for the timing requirements of both the Left-

Justified and TDM modes[3].

Figure 6 illustrates the clock and data connections to J4.

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CRD5381

Table 2 indicates the jumper options for J8 with the associated output data formats and some common

clock frequencies.

TDM/SDOUTB Data LRCK INPUT SCLK INPUT

J8

SDOUTA Data Format

Format

Frequency

3.072 MHz

6.144 MHz

12.288 MHz

6.144 MHz

12.288 MHz

24.576 MHz

LJ

24-bit Left-Justified

4-Channel TDM

48 kHz

LJ

24-bit Left-Justified

96 kHz

LJ

24-bit Left-Justified

192 kHz

48 kHz

TDM

-

96 kHz

192 kHz

Table 2. Clock and Data Formatting Options

.

J4

Signal

Ground

TDM/SDOUT B

LRCK INPUT

SCLK INPUT

SDOUT A

Figure 6. Clock and Data Header Connections, J4

2.4

System Status Indicators

ADC Overflow - Overflow indicators are provided for each CS5381. Overflow is indicated by the LED la-

beled ADC OVERFLOW A (D4) or ADC OVERFLOW B (D5) being lit. These control signals are also avail-

able as outputs on header J16, labeled OVERFLOW A and OVERFLOW B as shown in Figure 7 on page

11.

SRC Unlock - SRC unlock indicators are provided for each CS8421. SRC unlock is indicated by the LED

labeled SRC UNLOCK A (D3) or SRC UNLOCK B (D2) being lit. These control signals are also available

as outputs on header J16, labeled SRC UNLOCK A and SRC UNLOCK B as shown in Figure 7 on page 11.

2.5

System Reset

The CRD5381 provides an on-board reset and a connection for a user-applied reset signal through header

J16.

On-board Reset - The on-board reset signal is activated either upon power-up or by pressing push-button

S1. The reset signal is active-low, and is held low for approximately 350 ms after S1 has been pressed, or

power has been applied to the CRD5381.

External Reset - A connection is provided for a user to apply an external reset to the CRD5381 through

header J16 as shown in Figure 7 on page 11. The external reset should be an active-low, +3.3 V signal.

When an external reset signal is connected to the CRD5381, the on-board reset is the logical OR of the

power-up reset, the push-button reset, and the external reset.

10

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CRD5381

J16

Signal

Ground

RESET

OVERFLOW A

OVERFLOW B

SRC UNLOCK A

SRC UNLOCK B

Figure 7. Status Indicator and Reset Header, J16

2.6

Analog Inputs

The CRD5381 provides four fully differential analog inputs via J9, J11, J7, and J12; shown in Figure 9 and

Figure 10. Each analog input has the required analog circuitry to optimize the performance of each CS5381.

The input buffer to each CS5381 device has unity gain, and the CRD5381 differential input amplitude re-

quired to generate a full-scale digital output is typically 5.65 Vpp.

If extra analog input circuitry is required in the user’s design, it should drive a buffer equivalent to the con-

tents of the dotted boxes shown in Figure 9 and in Figure 10 labeled “CS5381 Required Input Circuitry”. In

this case, all components outside the dotted boxes in Figure 9 and Figure 10 should be removed from the

design.

2.7

Power

The CRD5381 requires the user to supply +3.3 V (J6) and ±12 V (J2 and J1) to the board. Onboard regula-

tors supply the required +5 V and +2.5 V. All voltage inputs must be referenced to the single black banana-

type ground connector (J5). Zener Diodes Z1 and Z2 (shown in Figure 14) are used to protect the CRD5381

circuitry from accidental connection of a reversed polarity supply or a supply of over ± 13 V to J1 and J2.

WARNING: Please refer to the CS5381 and CS8421 data sheet for allowable voltage levels.

2.8

Grounding and Power Supply Decoupling

The CS5381 and CS8421 require careful attention to power supply and grounding arrangements in order

to optimize performance. Figure 8 provides an overview of the connections on the CRD5381; Figure 15

shows the component placement. Figure 16 shows the top layout, Figure 17 shows the bottom layout, Fig-

ure 18 shows the power plane, and Figure 19 shows the ground plane. The decoupling capacitors are lo-

cated as close to the CS5381 and CS8421 as possible. Extensive use of ground plane fill in the evaluation

board yields large reductions in radiated noise.

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CRD5381

5. LAYOUT

Figure 15. Silk Screen

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CRD5381

Figure 16. Top Layer

20

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CRD5381

Figure 17. Bottom Layer

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CRD5381

Figure 18. Power Plane

22

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CRD5381

Figure 19. Ground Plane

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CRD5381

6. REFERENCES

[1] AN270- Audio A/D Conversion w/ Asynchronous Decimation Filter web page:

http://www.cirrus.com

[2] CS5381 - 120 dB, 192 kHz Stereo A/D Converter web page:

http://www.cirrus.com/en/products/pro/detail/P1024.html

[3] CS8421 - 32-bit, 192 kHz, Asynchronous, Stereo Sample Rate Converter web page:

http://www.cirrus.com/en/products/pro/detail/P1082.html

7. REVISION HISTORY

Release

DB1

Date

Changes

MAY 2005

1st Release

Table 3. Revision History

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative.

To find the one nearest to you go to www.cirrus.com

IIMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information contained in this document is accurate and reliable. However, the information is subject

to change without notice and is provided “AS IS” without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant

information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale

supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus

for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third

parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,

copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-

sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent

does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-

ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE

IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DE-

VICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD

TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED

IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICA-

TIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER

AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH

THESE USES.

Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks

or service marks of their respective owners.

24

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型号：	CRD5381
厂家：	CIRRUS LOGIC
描述：	Audio A/D Converter w/ Asynchronous Decimation Filter Reference Design 音频A / D转换器W /异步抽取滤波器参考设计转换器
文件：	总24页 (文件大小：968K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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