Texas Instruments ADS8401EVM Manual de usuario

User's GuideSLAU114A – December 2004

ADS8401/ADS8405/ADS8411EVM User's Guide

This user's guide describes the characteristics, operation, and use of theADS8401/ADS8405/ADS8411 16-bit parallel analog-to-digital converter evaluationboard. A complete circuit description, as well as schematic diagram, layout, and bill ofmaterials, are included.

Contents1 EVM Overview ...................................................................................... 22 Digital Interface ..................................................................................... 43 Power Supplies ..................................................................................... 54 Using the EVM ...................................................................................... 65 Related Documentation From Texas Instruments .............................................. 7Appendix A ADS8401EVM/ADS8405EVM/ADS8411EVM BOM .................................. 8Appendix B ADS8401/ADS8405/ADS8411EVM Layout .......................................... 10Appendix C ADS8401/ADS8405/ADS8411EVM Schematic ..................................... 14

List of Figures

1 ADS8411 Input Buffer Circuit ..................................................................... 32 Decoding Control Signals Using the Address Bus ............................................. 7B-1 Toplayer – Layer 1 ................................................................................ 10B-2 Ground Plane – Layer 2 .......................................................................... 11B-3 Power Plane – Layer 3 ........................................................................... 12B-4 Bottom Layer – Layer 4 .......................................................................... 13

List of Tables

1 Analog Input Connector ............................................................................ 22 Pad Jumper Setting ................................................................................ 33 Parallel Control Connector P2 .................................................................... 44 Pin Jumper Setting for Decoder Outputs ........................................................ 45 Data Bus Connector P3 ............................................................................ 46 Pinout for Converter Control Connector J3 ..................................................... 57 Power Supply Test Points ......................................................................... 58 Power Connector, J1, Pin Out .................................................................... 6A-1 Bill of Materials ...................................................................................... 8

ADS8401/ADS8405/ADS8411EVM User's GuideSLAU114A – December 2004 1

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1 EVM Overview

1.1 Features

1.2 Analog Interface

1.3 Signal Conditioning

EVM Overview

•Full-Featured evaluation board for the high speed SAR type ADS8401, ADS8405, and ADS841116-bit, single channel, parallel interface analog-to-digital converters.•On board signal conditioning•On board reference•Input and output digital buffers•On board decoding for stacking multiple EVMs

The ADS8401, ADS8405, and ADS8411 analog-to-digital converters have both a positive and negativeanalog input pin. The EVM gives the provision to ground the negative input close to the device via SJP3,or to wire in a user ground. The negative input pin, which has a range of –200 mV up to 200 mV, arrivesshorted to ground on the EVM via SJP3. A signal to the positive input pin can be applied at connector P1pin 2 (shown in Table 1 ) or at center pin of SMA connector J2.

Table 1. Analog Input Connector

Connector.Pin#

(1)

Signal Description

P1.2 +IN Non-inverting input channelP1.4 ReservedP1.6 ReservedP1.8 ReservedP1.10 ReservedP1.12 ReservedP1.14 ReservedP1.16 ReservedP1.18 ReservedP1.20 REF+ External reference input

(1)

All odd numbered pins of P1 are tied to AGND.

The factory recommends the analog input to any SAR type converter be buffered and low pass filtered.This input buffer on the ADS8411/ADS8405/ADS8401EVM utilizes the THS4031 configured as anINVERTING gain of one, as shown in Figure 1 . It is important to note the amplifier is not stable at a gain ofone, thus, it is configured in for inverting gain of one. The THS4031 was selected for its low noise, highslew rate and fast settling time. The low pass filter resistor and capacitor values are selected such thatADS8411/ADS8405/ADS8401EVM meets the 100 kHz ac performance specifications listed in the datasheet. The series resistor works in conjunction with the capacitor to filter the input signal, and isolates theamplifier from the large capacitive load. The capacitor to ground at the input of the A/D works inconjunction with the series resistor to filter the input signal, and acts like a charge reservoir. This externalfilter capacitor works with the amplifier to charge the internal sampling capacitor during sampling mode.

The EVM has a provision to offset the input voltage by adjusting a 10 k Ωpotentiometer (R25).

ADS8401/ADS8405/ADS8411EVM User's Guide2 SLAU114A – December 2004

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−VCC

+VCC

+4.096 V

Vin

1kΩ

THS4031

6800 pF

(+)IN

(−)IN

1kΩ

10 kΩ

0.22 µF

0.1 µF

1 µF

0.1 µF

500 Ω

15 Ω

C39

R13

R25

R10

C31

C37

C15

C33

1.4 Reference

EVM Overview

Figure 1. ADS8411 Input Buffer Circuit

The ADS8401/ADS8405/ADS8411EVM allows users to select from three different reference sources. Itprovides an onboard 4.096-V reference circuit. Allows for the user to supply a user reference voltage viaconnector P1 pin 20 or select the on-chip reference voltage. The user reference voltage and onboardreference voltages can be filtered by installing amplifier U1. The ADS8401, ADS8405, and ADS8411analog-to-digital converters have a integrated onboard reference buffer; therefore, it is not necessary tobuffer the voltage externally. The reference buffer (U1)circuit on the EVM is not populated with anamplifier for this reason. The EVM comes installed with on-chip internal reference shorted directly to thereference pin of the converter.

The EVM allows users to select from three reference sources via solder jumper pads SJP1, SJP2, andSJP3. Set SJP1, SJP2, and SJP3 to select from the three reference voltage sources. See Table 2 forjumper settings. See Appendix C for the full schematic.

Table 2. Pad Jumper Setting

Reference Description Jumper SettingDesignator

1–2 2–3

SJP1 Select REF3040 output for reference voltage Installed

(1)

Not installedSelect buffered reference voltage Not installed InstalledSJP2 Select internal A/D 4.096 V reference Installed

(1)

Not installedSelect U3, REF3040, as 4.096 V reference Not installed InstalledSJP3 Short (–) IN pin to ground Installed

(1)

N/ASJP4 Buffered REF3040 reference voltage Installed

(1)

Not installedBuffer user supplied reference voltage via P1 pin 20 Not installed InstalledSJP5 Apply offset voltage to A/D buffer Not installed N/ASJP6 Set negative rail of amplifier U1 to ground Installed Not installedSet negative rail of amplifier U1 to –V

Not installed InstalledSJP7 Set negative supply of amplifier U2 to ground Installed Not installedSet negative supply of amplifier U2 to –V

Not installed Installed

(1)

Factory set conditioin

SLAU114A – December 2004 3ADS8401/ADS8405/ADS8411EVM User's Guide

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2 Digital Interface

Digital Interface

The ADS8411/ADS8405/ADS8401EVM is designed for easy interfacing to multiple platforms. Samtec plugand socket connectors provide a convenient dual row header/socket combination at P1, P2 and P3 to pluginto prototype boards or ribbon cables. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for avariety of mating connector options.

Table 3. Parallel Control Connector P2

Connecator.Pin

(1)

Signal Description

P2.1 DC_CS Daughter card Board Select pinP2.3

P2.5

P2.7 A0 Address line from processorP2.9 A1 Address line from processorP2.11 A2 Address line from processorP2.13

P2.15

P2.17

P2.19 BUSY Busy signal from converter. W4 must be shorted.

(1)

All even numbered pins of P2 are tied to DGND

Read ( RD), conversion start ( CONVST), and reset ( RESET) signals to the converter can be assigned totwo different addresses in memory via jumper settings. This allows for the stacking of up to twoADS8401EVM, ADS8405EVM and/or ADS8411EVMs into processor memory. See Table 4 for jumpersettings. Note that the evaluation module does not allow the chip select ( CS) line of the converter to beassigned to different memory locations. It is, therefore, suggested the CS line be grounded or wired to anappropriate signal of the processor.

Table 4. Pin Jumper Setting for Decoder Outputs

Reference Description Jumper SettingDesignator

1–2 2–3

W1 Set A[2..0] = 0x1 to generate RD pulse Installed

(1)

Not installedSet A[2..0] = 0x2 to generate RD pulse Not installed InstalledW2 Set A[2..0] = 0x3 to generate CONVST pulse Installed

(1)

Not installedSet A[2..0] = 0x4 to generate CONVST pulse Not installed InstalledW3 Set A[2..0] = 0x5 to generate RESET pulse Installed

(1)

Not installedSet A[2..0] = 0x6 to generate RESET pulse Not installed InstalledW4 Short busy signal to P2 pin 19 Installed

(1)

N/A

(1)

Factory set conditioin

The data bus is available at connector P3. See Table 5 for pin out information.

Table 5. Data Bus Connector P3

Connector.Pin

(1)

Signal Description

P3.1 D0 Buffered Data Bit 0 (LSB)P3.3 D1 Buffered Data Bit 1P3.5 D2 Buffered Data Bit 2

(1)

All even numbered pins of P3 are tied to DGND.

ADS8401/ADS8405/ADS8411EVM User's Guide4 SLAU114A – December 2004

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3 Power Supplies

Power Supplies

Table 5. Data Bus Connector P3 (continued)

Connector.Pin

(1)

Signal Description

P3.7 D3 Buffered Data Bit 3P3.9 D4 Buffered Data Bit 4P3.11 D5 Buffered Data Bit 5P3.13 D6 Buffered Data Bit 6P3.15 D7 Buffered Data Bit 7P3.17 D8 Buffered Data Bit 8P3.19 D9 Buffered Data Bit 9P3.21 D10 Buffered Data Bit 10P3.23 D11 Buffered Data Bit 11P3.25 D12 Buffered Data Bit 12P3.27 D13 Buffered Data Bit 13P3.29 D14 Buffered Data Bit 14P3.31 D15 Buffered Data Bit 15 (MSB)

This evaluation module provides direct access to all the analog-to-digital converter control signals viaconnector J3, see Table 6 .

Table 6. Pinout for Converter Control Connector J3

Connector.Pin

(1)

Signal Description

J3.1 CS Chip select pin, active lowJ3.3 RD Read pin, active lowJ3.5 CONVST Convert start pin, active lowJ3.7 BYTE BYTE mode pin, used for 8-bit busesJ3.9 RESET Reset pin, active lowJ3.11 BUSY Converter status output. High when a conversion is in process.

(1)

All even numbered pins of J3 are tied to DGND.

The EVM accepts four power supplies.•A dual ±Vs dc supply for the dual supply op amps. Recommend ±12 VDC supply.•A single +5 V dc supply for analog section of the board (A/D + Reference).•A single +5 V or +3.3 V dc supply for digital section of the board (A/D + address decoder + buffers).

The two ways to provide these voltages are as follows:1. Wire in voltages at test points on the EVM. See Table 7 .

Table 7. Power Supply Test Points

Test Point Signal Description

TP11 +BVDD Apply +3.3 VDC or +5 VDC. See respective ADC data sheet for full range.TP10 +AVCC Apply +5 VDCTP12 +VA Apply +12.0 VDC. Positive supply for amplifier.TP14 –VA Apply –12.0 VDC. Negative supply for amplifier.

ADS8401/ADS8405/ADS8411EVM User's GuideSLAU114A – December 2004 5

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4 Using the EVM

Using the EVM

2. Use the power connector J1, and derive the voltages elsewhere. See Table 8 for the pinoutsfor this connector.

Table 8. Power Connector, J1, Pin Out

Signal Power Connector – J1 Signal

+VA (+12VA) 1 2 –VA (–12VA)+AVCC (+5VA) 3 4 N/CN/C 5 6 AGNDN/C 7 8 N/CN/C 9 10 +BVCC (+5VD)

The ADS8401/ADS8405/ADS8411EVM serves three functions:1) a reference design2) a prototype board3) a test platform for the software engineer to develop code.

As a reference design, the ADS8401/ADS8405/ADS8411EVM contains the essential circuitry to showcasethe analog-to-digital converter. This essential circuitry includes the input amplifier, reference circuit, andbuffers. The EVM analog input circuit is optimized for 100 kHz sine wave, therefore users may need toadjust the resistor and capacitor values of the A/D input RC circuit. In AC type applications where signaldistortion is concern, polypropylene capacitors should be used in the signal path. In applications where theinput is multiplexed, the A/D input resistor and capacitor may need to be adjusted or possibly removedaltogether.

As a prototype board, the buffer circuit consists of footprint is a standard 8–pin SOIC and resistor pads forinverting and non-inverting configurations. The ADS8401/ADS8405/ADS8411EVM can be used toevaluate both dual and single supply amplifiers. The EVM comes installed with a dual supply amplifier as itallows the user to take advantage of the full input voltage range of the converter. For applications thatrequire signal supply operation and smaller input voltage range, the THS4031 can be replaced with thesingle supply amplifier like OPA300 or OPA355. Pad jumper SJP7 should be shorted between pads 1 and2, as it shorts the minus supply pin of the amplifier to ground. Positive supply voltage can be applied viatest pint TP12 or connector J1 pin 1.

As a software test platform, connectors P1, P2 and P3 plug into the parallel interface connectors of the5-6K interface card. The 5-6K interface card sits on the C5000 and C6000 Digital Signal Processor starterkit (DSK). The ADS8401/ADS8405/ADS8411EVM is then mapped into the processor's memory space.This card also provides an area for signal conditioning. This area can be used to install applicationcircuit(s) for digitalization by the ADS8401, ADS8405 or ADS8411 analog-to-digital converter. Refer to the5-6K interface card user's guide (SLAU104 ) for more information.

For the software engineer the ADS8401/ADS8405/ADS8411EVM provides a simple platform forinterfacing to the converter. The EVM provides standard 0.1 inch headers and sockets to wire intoprototype boards. The user need only provide in 3 address lines (A2, A1, A0) and address valid lineDC_CS) to connector P2, as shown in Figure 2 . To choose which address combinations will generate RD,CONVST, and RESET set jumpers as shown in Table 4 . Recall chip select ( CS) signal is not memorymapped or wired to P2, therefore it must be controlled via general purpose pin or shorted to ground at J3pin 1. If address decoding is not required, the EVM provides direct access to converter data bus andcontrol I/O via connectors P3 and J3, respectively.

ADS8401/ADS8405/ADS8411EVM User's Guide6 SLAU114A – December 2004

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Y7 RESET

CONVST

SN74AHC138

DC_CS

5 Related Documentation From Texas Instruments

Related Documentation From Texas Instruments

Figure 2. Decoding Control Signals Using the Address Bus

To obtain a copy of any of the following TI documents, call the Texas Instruments Literature ResponseCenter at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering,identify this booklet by its title and literature number. Updated documents can also be obtained throughour website at www.ti.com.

Data Sheets Literature Number:ADS8401 SLAS376ADS8405 SLAS427ADS8411 SLAS369THS4031 SLOS224OPA627 SBOS165REF3040 SBVS032SN74AHC138 SCLS258SN74AHC245 SCLS230

ADS8401/ADS8405/ADS8411EVM User's GuideSLAU114A – December 2004 7

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Appendix A ADS8401EVM/ADS8405EVM/ADS8411EVM BOM

Appendix A

Table A-1 contains a complete bill of materials for the ADS8401/ADS8405/ADS8411EVM. The schematicdiagram is provided in Appendix C. Contact the Product Information Center or e-mail[email protected] for questions regarding this EVM.

Table A-1. Bill of Materials

Item QTY Value Reference MFG MFG. Part No. DescriptionNo. Designators

1 1 0 ΩR24 Panasonic - ECG or ERJ-3GEY0R00V Resistor, 0 Ω, 1/16 W, 5%, 0603 SMDalternate

2 1 15 ΩR1 Panasonic - ECG or ERJ-6ENF15R0V Resistor, 15 Ω, 1/10 W, 1%, 0805 SMDalternate

0 R1

(1)

Panasonic - ECG or ERJ-6GEY0R00V Resistor 0 Ω, 805alternate

3 1 49.9 ΩR8 Panasonic - ECG or ERJ-8ENF49R9V Resistor, 49.9 Ω, 1/8 W, 1%, 1206 SMDalternate

4 1 NI R11 Not installed Not installed

5 1 5 ΩR13 Yageo America or 9C08052A4R99FKHFT Resistor, 4.99 Ω, 1/8 W, 1%, 0805 SMDalternate

15 ΩR13

(1)

Panasonic - ECG or ERJ-6ENF15R0V Resistor, 15 Ω, 1/10W, 1%, 0805 SMDalternate

6 1 75 ΩR21 Panasonic - ECG or ERJ-6ENF75R0V Resistor, 75 Ω, 1/10 W, 1%, 0805 SMDalternate

7 1 100 ΩR14 Panasonic - ECG or ERJ-6ENF1000V Resistor, 100 Ω, 1/10 W, 1%, 0805 SMDalternate

8 1 200 ΩR4 Panasonic - ECG or ERJ-6ENF2000V Resistor, 200 Ω, 1/10 W, 1%, 0805 SMDalternate

9 1 499 ΩR2 Panasonic - ECG or ERJ-6ENF4990V Resistor, 499 Ω, 1/10 W, 1%, 0805 SMDalternate Panasonic -ECG or alternate

10 2 1 k ΩR6 R10 Panasonic - ECG or ERJ-6ENF1001V Resistor, 1 k Ω, 1/10 W, 1%, 0805 SMDalternate

11 5 10 k ΩR16, R17, R18, Panasonic - ECG or ERJ-3EKF1002V Resistor, 10 k Ω, 1/16 W, 1%, 0603 SMDR19, R20 alternate

12 4 1 nF C3, C5, C11, C23 TDK Corporation or C3216C0G1H102JT Capacitor, 1000 pF, 50 V, ceramic, NPOalternate 1206

13 1 4700 pF C39 WIMA MKP2 4700/630/5 Capacitor, 4700 pF, polypropylene

6800 pF C39

(1)

WIMA MKP2 6800/100/1 Capacitor, 6800 pF, polypropylene

14 10 0.01 µF C13, C21, C38, TDK Corporation or C1608X7R1H103JT Capacitor, 10000 pF, 50 V, ceramic, X7RC41, C44, C46, alternate 0603C48, C53 C50, C56

15 3 0.01 µF C10, C18, C20 TDK Corporation or C2012X7R1H103KT Capacitor, 10000 pF, 50 V, ceramic, X7Ralternate 0603

16 14 0.1 µF C8, C25, C34, C40, TDK Corporation or C1608X7R1E104KT Capacitor, 0.1 µF, 25 V, ceramic, X7RC42, C43, C47, alternate 0603C51, C52, C54,C55, C57, C58, C62

17 7 0.1 µF C7, C9, C15, C22, TDK Corporation or C2012X7R1H104JT Capacitor, 0.10 µF, 50 V, ceramic, X7RC32, C36, C45 alternate 0805

18 2 0.01 µF C4, C26 TDK Corporation or C3216X7R1H103JT Capacitor, 10000 pF, 50 V, ceramic, X7Ralternate 1206

19 1 0.22 µF C33 TDK Corporation or C2012X7R1C224KT Capacitor, 0.22 µF, 16 V, ceramic, X7Ralternate 0805

20 4 1 µF C31, C37, C59, C60 TDK Corporation or C2012X7R1E105KT Capacitor,ceramic, 1 µF, 25 V, X7R 0805alternate T/R

21 2 1 µF C2, C28 TDK Corporation or C3216X7R1E105KT Capacitor, 0.1 µF, 25 V, ceramic, X7Ralternate 1206

(1)

This part is to be used with the ADS8411EVM only.

ADS8401EVM/ADS8405EVM/ADS8411EVM BOM8 SLAU114A – December 2004

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Appendix A

Table A-1. Bill of Materials (continued)Item QTY Value Reference MFG MFG. Part No. DescriptionNo. Designators

22 4 10 µF C1, C6, C12, C19 TDK Corporation or C3216X5R1C106MT Capacitor, 10 µF, 16 V, ceramic, X5R 1206alternate

23 3 10 µF C14, C24, C49 Kemet or alternate T491B106K016AS Capacitor, tantalum, 10 µF, 16 V, 10%,SMT

24 1 22 µF C17 TDK Corporation or C3216X5R0J226MT Capacitor, 22 µF, 6.3 V, ceramic, X5Ralternate 1206

25 2 47 µF C27, C29 Kemet or alternate T491B476M010AS Capacitor, tantalum, 47 µF, 10 V, 20%,SMT

26 2 NI C16, R3 Not installed Not installed

27 5 NI C30, C35, C61, Not installed Not installed Chip resistor, 1/10 W, 0805C63, R5

28 1 10 k ΩR25 Bourns 3214W-1-103E Trimpot, 10 k Ω, 4 mm top ADJ SMD

29 2 1 k ΩRP1, RP3 CTS Corporation 742C163102JTR Resistor array, 1 k Ω, 16 terminal, 8 resistor,SMD

30 1 100 ΩRP2 CTS Corporation 742C163101JTR Resistor array, 100 Ω, 16 terminal, 8 re-sistor, SMD

31 4 BLM21AJ601SN1L L1, L2, Lc, L4 TDK Corporation or MPZ2012S601AT Chip ferrite beads, 600 Ωat 100 MHzalternate

32 1 OPA627 U1 Not installed Not installed

33 1 THS4031 U2 Texas Instruments THS4031IDR Amplifier, 100-MHz, low-noise, high-speed

34 1 REF3040 U3 Texas Instruments REF3040AIDBZT REF3040, 50 ppm/ °C, 50 µA in SOT23-3CMOS voltage reference

35 1 ADS8401 U4 Texas Instruments ADS8401IPFBT ADS8401, 16 bit, 1.25 MSPS

ADS8405 U4

(2)

Texas Instruments ADS8405IPFBT ADS8405, 16 bit, 1.25 MSPS

ADS8411 U4

(1)

Texas Instruments ADS8411IPFBT ADS8411, 16 bit, 2 MSPS

36 3 SN74AHC245PWR U5, U6, U7 Texas Instruments SN74AHC245PWR Octal bus transceiver, 3-state

37 1 SN74AHC138PWR U8 Texas Instruments SN74AHC138PWR 3-line to 8-line decoder/demultiplexer

38 1 SOIC-8 U9 Not installed Not installed

39 1 5X2X.1 J1 Samtec SSW-105-22-S-D-VS 0.025" SMT socket - bottom side of PWBSamtec TSM-105-01-T-D-V-P 0.025" SMT plug - top side of PWB

40 1 SMA_PCB_MT J2 Johnson Components 142-0701-301 Right angle SMA connectorInc.

41 1 6X2X.1 J3 Samtec SSW-106-22-S-D-VS 0.025" SMT socket - bottom side of PWBSamtec TSM-105-01-T-D-V-P 0.025" SMT plug - top side of PWB

42 2 10X2x.1 P1, P2 Samtec SSW-110-22-S-D-VS 0.025" SMT socket - bottom side of PWBSamtec TSM-110-01-T-D-V-P 0.025" SMT plug - top side of PWB

43 1 16X2X.1_SMT_ P3 Samtec SSW-116-22-S-D-VS 0.025" SMT socket - bottom side of PWBPLUG_ &_SOCKET Samtec TSM-116-01-T-D-V-P 0.025" SMT plug - top side of PWB

44 1 SW-PB S1 Panasonic EVQ-PJU04K Switch

45 2 SJP2, SJP3, SJP5 Not installed Not installed Pad 2 position jumper

46 5 SJP1, SJP2, SJP3, Not installed Not installed Pad 3 position jumperSJP4, SJP6, SJP7

47 2 2POS_JUMPER W4, W5 Samtec TSW-102-07-L-S 2 Positiion jumper, 0.1" spacing

48 3 3POS_JUMPER W1, W2, W3 Samtec TSW-103-07-L-S 3 Positiion jumper, 0.1" spacing

49 14 TP_0.025 TP1, TP2, TP3, Keystone 5000K-ND Test point - Single, 0.025" pinTP4, TP5, TP6, ElectronicsTP7, TP8, TP9,TP10, TP11, TP12,TP13, TP14

(2)

This part is to be used with the ADS8405EVM only.

ADS8401EVM/ADS8405EVM/ADS8411EVM BOMSLAU114A – December 2004 9

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Appendix B ADS8401/ADS8405/ADS8411EVM Layout

Appendix B

Figure B-1. Toplayer – Layer 1

ADS8401/ADS8405/ADS8411EVM Layout10 SLAU114A – December 2004

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