Texas Instruments ADS7881 Manuale utente

User's GuideSLAU150 – December 2004

ADS7881/ADS7891EVM

This users guide describes the characteristics, operation, and use of theADS7881/ADS7891 12-Bit/14-Bit, parallel, analog-to-digital converter evaluation mod-ule. A complete circuit description, as well as schematic diagram, layout and bill ofmaterials, are included.

Contents1 Related Documentation from Texas Instruments ............................................... 12 EVM Overview ...................................................................................... 23 Introduction .......................................................................................... 24 Analog Interface .................................................................................... 25 Digital Interface ..................................................................................... 46 Power Supplies ..................................................................................... 67 Using the EVM ...................................................................................... 6Appendix A ADS7881EVM/ADS7891EVM Bill of Materials ........................................ 8Appendix B ADS7881EVM/ADS7891EVM Layout ................................................ 10Appendix C ADS7881EVM/ADS7891EVM Schematic ............................................ 14

List of Figures

1 ADS7881 Input Buffer Circuit ..................................................................... 32 Decoding Control Signals Using the Address Bus ............................................. 7B-1 Top Layer – 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 ............................................................................ 21 Analog Input Connector ............................................................................ 32 Solder Short Jumper Setting ...................................................................... 43 Pinout for Parallel Control Connector P2 ........................................................ 44 Jumper Settings ..................................................................................... 55 Data Bus Connector P3 ............................................................................ 56 Pinout for Converter Control Connector J3 ..................................................... 67 Power Supply Test Points ......................................................................... 68 Power Connector, J1, Pin Out .................................................................... 6A-1 Bill of Materials ...................................................................................... 8

ADS7881/ADS7891EVMSLAU150 – December 2004 1

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1 Related Documentation from Texas Instruments

2 EVM Overview

2.1 Features

3 Introduction

4 Analog Interface

Related Documentation from Texas Instruments

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:ADS7881 SLAS400ADS7891 SLAS410ADS8411 SLAS369THS4031 SLOS224OPA132 SBOS054REF1004-2.5 SBVS032SN74AHC138 SCLS258SN74AHC245 SCLS230SN74AHC1G04 SCLS318

•Full-featured Evaluation Board for the high speed SAR type ADS7881(12-bit 4MSPS) orADS7891(14-bit 3MSPS) 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 ADS7881EVM and ADS7891EVM showcase the 12-bit 4-MSPS and 14-bit 3MSPS A-to-D converter.The ADS7881 and ADS7891 devices include a capacitor based SAR A/D converter with inherent sampleand hold. The two devices offer either a 12-bit or 14-bit parallel interface. Both offer byte mode operationthat enables easy interface with 8-bit processors. They also have a pseudo-differential input stage and a2.5V internal reference.

This evaluation module serves as a reference design and a low cost method to test these converters inthe users' application. The following sections will describe the pin outs of the various analog, power anddigital connectors and power requirements.

The ADS7881 and ADS7891 analog-to-digital converter has both a positive and negative analog input pin.The negative input pin, which has a range of -200mV up to 200mV is shorted on the board. A signal forthe positive input pin can be applied at connector P1 pin 2(shown in Table 1 ) or at center pin of SMAconnector J2.

2 SLAU150 – December 2004ADS7881/ADS7891EVM

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4.1 Signal Conditioning

130 pF

C0G

+2.5 V

THS4031

1000 pF

C0G

(+)IN

(−)IN

C35

C16

R13

C33

R25

C31

C37

C15

R10

R12

604 

−VCC

0.1 F

1 F

604 

21 

12 

1 F

0.1 F

+VCC

1 F

VIN

10 k

Analog Interface

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 ADS7881/ADS7891EVM utilizes the THS4031 configured as an INVERTING gainof one, as shown in Figure 1 . It is important to note the amplifier is not stable at a gain of one, thus, it isconfigured in for inverting gain of one. The THS4031 was selected for its low noise, high slew rate andfast settling time. The low pass filter resistor and capacitor values were selected such thatADS7881/ADS7891EVM would meet the 1MHz AC performance specifications listed in the datasheet. Theseries resistor works in conjunction with the capacitor to filter the input signal, but also isolates theamplifier from the capacitive load. The capacitor to ground at the input of the A/D works in conjunctionwith the series resistor to filter the input signal, and acts like a charge reservoir. This external filtercapacitor works with the amplifier to charge the internal sampling capacitor during sampling mode.Resistors R1 and R12 were selected to reduce offset.

The EVM has a provision to offset the input voltage by adjusting, R25, a 10k potentiometer.

Figure 1. ADS7881 Input Buffer Circuit

ADS7881/ADS7891EVMSLAU150 – December 2004 3

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4.2 Reference

5 Digital Interface

Digital Interface

The ADS7881/ADS7891EVM provides an onboard 2.5V reference circuit. The EVM also has the provisionfor users to supply a reference voltage via connecter P1 pin 20. This reference voltage can be filteredthrough amplifier U1. The converter itself has on-chip reference buffer, therefore it is not necessary tobuffer externally. The reference buffer circuit on the EVM is used to generate the offset voltage for theinput amplifier, U2.

The EVM allows users to select from three reference sources. Set SJP1, SJP2, and SJP4 to selecton-board reference voltage (REF1004-2.5), ADC internal reference or a user supplied reference voltagevia P1 pin 20. See Table 2 for jumper settings. See Appendix B for full schematic.

Table 2. Solder Short Jumper Setting

Reference PadsDescriptionDesignator

1–2 2–3

SJP1 Apply on-board reference directly to SJP2 pin 3 Installed

(1)

Apply buffered reference voltage to SJP2 pin 3 InstalledSJP2 Apply internal reference to REFIN pin Installed

(1)

Apply external reference to REFIN pin InstalledSJP4 Apply on-board reference to U1, reference buffer InstalledApply user supplied reference to U1, reference buffer InstalledSJP5 Apply DC offset to input signal Installed

(1)

N/ASJP6 Short to pin 4 of amplifier U1 to ground InstalledShort to pin 4 of amplifier U1 to -VCC Installed

(1)

SJP7 Short to pin 4 of amplifier U2 to ground InstalledShort to pin 4 of amplifier U2 to -VCC Installed

(1)

Factory set condition

The ADS7881/ADS7891EVM is designed for easy interfacing to multiple platforms. Samtec part numbersSSW-110-22-F-D-VS-K , TSM-110-01-T-DV-P, SSW-116-22-S-D-VS , and TSM-116-01-T-D-V-P provide aconvenient dual row header/socket combination at P1, P2, P3, and J3. Please consult Samtec atwww.samtec.com or 1-800-SAMTEC-9 for a variety of mating connector options.

Connectors P1, P2 and P3 allows the user to plug the EVM into the 5-6k interface card to interface directlywith TMS320C5000 and TMS320C6000 series of DSP. See Table 3 for connector pin out.

Table 3. Pinout for Parallel Control Connector P2

Connector.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

(1)

All even numbered pins of P2 are tied to DGND.

ADS7881/ADS7891EVM 4 SLAU150 – December 2004

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Digital Interface

Table 3. Pinout for Parallel Control Connector P2 (continued)

Connector.Pin

(1)

Signal Description

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

Read( RD), conversion start( CONVST) and reset ( RESET) signals to the converter can be assigned to twodifferent addresses in memory via jumper settings. This allows for the stacking of up to twoADS7881EVM, and/or ADS7891EVMs into processor memory. See Table 4 for jumper settings. Note, theevaluation module does not allow chip select ( CS) line of the converter to be assigned to different memorylocations. It is therefore suggested the CS line be grounded or wired to an appropriate signal of the userprocessor.

Table 4. Jumper Settings

Reference PinsDescriptionDesignator

1–2 2–3

W1 Short U8 pin 14 to Powerdown/Reset signal Installed

(1)

Short U8 pin 13 to Powerdown/Reset signal InstalledW2 Short U8 pin 12 to CONVST signal Installed

(1)

Short U8 pin 11 to CONVST signal InstalledW3 Short U8 pin 10 to RD signal Installed

(1)

Short U8 pin 8 to RD signal InstalledW4 Short inverted BUSY to INTC Installed

(1)

Short BUSY to INTC InstalledW5 Short +5VD to +BVDD Installed

(1)

Short +3.3VD to +BVDD Installed

(1)

Factory set condition

The data bus is available at connector P3, see table 4 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 2P3.7 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 11 (MSB - ADS7881)P3.25 D12 Buffered Data Bit 12P3.27 D13 Buffered Data Bit 13 (MSB - ADS7891)P3.29 D14 Not connectedP3.31 D15 Not connected

(1)

All even numbered pins of P3 are tied to DGND.

ADS7881/ADS7891EVMSLAU150 – December 2004 5

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6 Power Supplies

Power Supplies

This evaluation module provides direct access 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 low.J3.3 RD Read pin. Active low.J3.5 CONVST Convert start pin. Active low.J3.7 BYTE BYTE mode pin. Used for 8-bit buses.J3.9 PWD/RST Active low input, acts as device power down/device reset signal.J3.11 A_PDWN Nap mode enable, active lowJ3.13 BUSY Converter status output. High when a conversion is in progress.

(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 ±12VDC supply.•A single +5.0 V DC supply for analog section of the board (A/D + Reference).•A single +5.0V or +3.3V DC supply for digital section of the board (A/D + address decoder + buffers).

There are two ways to provide these voltages.•Wire in voltages at test points on the EVM. See Table below.

Table 7. Power Supply Test Points

Test Point Signal Description

TP11 +BVDD Apply +3.3VDC or +5.0VDC. See respective ADC datasheet for full range.TP10 +AVCC Apply +5.0VDC.TP12 +VA Apply +12.0VDC. Positive supply for amplifier.TP14 –VA Apply -12.0VDC. Negative supply for amplifier.

•Use the power connector J1, and derive the voltages else where. The pin out for this connector isbelow. Set jumper W5 to short between pins 1-2 or pins 2-3 to short +3.3VD or +5VD, respectively, tobe the buffer digital supply (+BVDD).

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/C+3.3VD 9 10 +5VD

ADS7881/ADS7891EVM 6 SLAU150 – December 2004

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7 Using the EVM

CONVST

RESET

SN74AHC138

DC_CS

Using the EVM

The ADS7881EVM/ADS7891EVM serves as a reference design, prototype board and as test platform forthe software engineer to develop code.

As a reference design, the ADS7881EVM/ADS7891EVM contains the essential circuitry to showcase theanalog-to-digital converter. This essential circuitry includes the input amplifier, reference circuit, andbuffers. The EVM analog input circuit is optimized for 1 MHz 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 were theinput is multiplexed, the A/D input resistor and capacitor may need to 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 ADS7881EVM/ADS7891EVM can be used to evaluate bothdual and single supply amplifiers. The EVM comes installed with a dual supply amplifier as it allows theuser to take advantage of the full input voltage range of the converter. For applications that require signalsupply operation and smaller input voltage range, the THS4031 can be replaced with the single supplyamplifier like OPA300. Pad jumper SJP7 should be shorted between pads 1 and 2, as it shorts the minussupply pin of the amplifier to ground. Positive supply voltage can be applied via test point TP12 orconnector J1 pin 1.

As a software test platform, connectors P1, P2, P3 plug into the parallel interface connectors of the 5-6Kinterface card. The 5-6K interface card sits on the C5000 and C6000 Digital Signal Processor starter kit(DSK). The ADS7881EVM/ADS7891EVM is then mapped into the processor's memory space. This cardalso provides an area for signal conditioning. This area can be used to install application circuit(s) fordigitization by the ADS7881 and/or ADS7891 analog-to-digital converter. Refer to the 5-6K interface carduser's guide (SLAU104 ) for more information.

For the software engineer the ADS7881EVM/ADS7891EVM provides a simple platform for interfacing tothe converter. The EVM provides standard 0.1" headers and sockets to wire into prototype boards. Theuser need only provide in 3 address lines (A2, A1, A0) and address valid line( DC_CS) to connector P2, asshown in Figure 2 . To choose which address combinations will generate RD, CONVST, and RESET setjumpers as shown in Table 4 . Recall chip select ( CS) signal is not memory mapped or tied to P2, thereforeit must be controlled via general purpose pin or shorted to ground at J3 pin 1. If address decoding is notrequired, the EVM provides direct access to converter data bus via P3 and control via J3.

Figure 2. Decoding Control Signals Using the Address Bus

ADS7881/ADS7891EVMSLAU150 – December 2004 7

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Appendix A ADS7881EVM/ADS7891EVM Bill of Materials

Appendix A

The following table contains a complete Bill of Materials for the ADS7881EVM/ADS7891EVM. Theschematic diagram is also provided for reference. Contact the Product Information Center or e-mail[email protected] for questions regarding this EVM.

Table A-1. Bill of Materials

Item Reference Footprint Manufacturer'sQty. Value Manufacturer DescriptionNo. Designators Part Number

1 2 21 R1 R12 805 Panasonic-ECG or Alter- ERJ-6ENF21R RES, 21.0 Ω, 1/10W, 1% 0805nate SMD

2 3 NI R2 R5 R11 805 NOT INSTALLED NOT INSTALLED

3 1 NI R3 603 NOT INSTALLED NOT INSTALLED 1/10W, 0805 Chip Resistor

4 3 100 R4 R14 R15 805 Panasonic-ECG or Alter- ERJ-6ENF1000V RES, 100 Ω, 1/10W, 1%, 0805nate SMD

5 2 604 R6 R10 805 Panasonic-ECG or Alter- ERJ-6ENF6040V RES, 604 Ω, 1/10W, 1%, 0805nate SMD

6 6 10k R7 R16 R17 R18 R19 603 Panasonic-ECG or Alter- ERJ-3EKF1002V RES, 10.0 k Ω, 1/16W, 1%, 0603R20 nate SMD

7 1 49.9 R8 1206 Panasonic-ECG or Alter- ERJ-8ENF49R9V RES, 49.9 Ω, 1/8W, 1%, 1206nate SMD

8 1 49.9k R9 805 Panasonic-ECG or Alter- ERJ-6ENF4992V RES, 49.9 k Ω, 1/10W, 1%, 0805nate SMD

9 1 12 R13 805 Panasonic-ECG or Alter- ERJ-6GEYJ120V RES, 12 Ω, 1/8W, 5%, 0805 SMDnate

1 10 R13

(1)

805 Yageo America or Alter- 9C08052A10R0FKHFT RES, 10 Ω, 1/8W, 1%, 0805 SMDnate

10 1 75 R21 805 Panasonic-ECG or Alter- ERJ-6ENF75R0V RES, 75.0 Ω, 1/10W, 1%, 0805nate SMD

11 1 0 R24 603 Panasonic-ECG or Alter- ERJ-3GEY0R00V RES, 0 Ω, 1/16W, 5%, 0603 SMDnate

12 1 10k R22 805 Panasonic-ECG or Alter- ERJ-6ENF1002V RES, 10.0 k Ω, 1/10W, 1%, 0805nate SMD

13 1 10k R25 BOURNS_ 32 ×4W Bourns 3214W-1-103E TRIMPOT, 10 k Ω, 4MM TOP ADJSMD

14 4 10 µF C1 C6 C12 C19 1206 TDK Corporation or Alter- C3216X5R1C106KT CAP, CER, 10 µF, 16V, X5R,nate 20%, 1206

15 2 1 µF C2 C28 603 TDK Corporation or Alter- C1608X5R1C105K CAP, CER, 1.0 µF, 16V, X5R,nate 10%, 0603

16 5 1000 pF C3 C5 C11 C16 C23 603 TDK Corporation or Alter- C1608C0G1H102J CAP, CER, 1000 pF, 50V, C0G,nate 5%, 0603

17 13 0.01 µF C4 C10 C13 C20 603 TDK Corporation or Alter- C1608X7R1H103KT CAP, CER, 10000 pF, 50V, X7R,C21C26 C41 C44 C46 nate 10%, 0603C48 C50 C53 C56

18 4 0.1 µF C7 C15 C32 C36 805 TDK Corporation or Alter- C1608X7R1E104K CAP, CER, 0.10 µF, 25V X7R,nate 10%, 0603

19 8 2.2 µF C8 C40 C42 C47 C51 603 TDK Corporation or Alter- C1608X5R1A225MT CAP, CER, 2.2 µF, 6.3V, X5R,C52 C54 C55 nate 20%, 0603

20 9 0.1 µF C9 C18 C22 C25 C38 603 TDK Corporation or Alter- C1608X7R1E104K CAP, CER, 0.10 µF, 25V, X7RC43 C57 C58 C62 nate 10%, 0603

21 4 10 µF C14 C24 C27 C29 6032 Panasonic-ECG or Alter- ECS-T1EC106R CAP, 10 µF, 25V, TANTALUM,nate TE, SMD

22 1 22 µF C17 1206 Panasonic-ECG or Alter- C3216XR0J226M CAP, CER, 22 µF, 6.3V X5R,nate 20%, 1206

1 1500 pF C16

(1)

603 TDK Corporation or Alter- C1608C0G1H152J CAP, CER, 1500 pF, 50V, C0G,nate 5%, 0603

23 4 NI C30 C39 C61 C63 805 NOT INSTALLED NOT INSTALLED Multilayer Ceramic - 0805 Size

24 5 1 µF C31 C33 C37 C59 C60 805 TDK Corporation or Alter- C2012X7R1E105K CAP, CER, 1.0 µF, 25V, X7R,nate 0805, T/R

25 1 130 pF C35 805 TDK Corporation or Alter- C2012C0G1H131 CAP, CER, 130 pF, 50V 5%,nate C0G, 0805

26 1 10 µF C49 3528 Kemet or Alternate T491B106K016AS CAP, TANTALUM, 10 µF, 16V10%, SMD

(1)

Used for ADS7891EVM only.

ADS7881EVM/ADS7891EVM Bill of Materials8 SLAU150 – December 2004

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Appendix A

Table A-1. Bill of Materials (continued)Item Reference Footprint Manufacturer'sQty. Value Manufacturer DescriptionNo. Designators Part Number

27 2 1K RP1 RP3 CTS_742 CTS Corporation 742C163102JTR RES ARRAY, 1 k Ω, 16TERM8RES SMD

28 1 100 RP2 CTS_742 CTS Corporation 742C163101JTR RES ARRAY 100 Ω16TRM,8RES SMD

29 4 L1 L2 L3 L4 805 TDK Corporation MMZ2012R601A Ferrite chip, 600 Ω, 500 mA

30 1 U1 8-SOP(D) Texas Instruments OPA132UA DiFet amplifier

31 1 U2 8-SOP(D) Texas Instruments THS4031IDR 100 MHz, low-noise, high-speedamplifier

32 1 NI U3 3-SOT-23 NOT INSTALLED NOT INSTALLED REF3040, 50 ppm/–C, 50-A inSOT23-3 CMOS voltage refer-ence

33 1 ADS7881 U4 SOCKET_48 QFPP Texas Instruments ADS7881IPFBT ADS7881, 12-bit, 4 MSPS

ADS7891 U4

(1)

ADS7891IPFBT ADS7891, 14-bit, 3 MSPS

34 3 SN74AHC245 U5 U6 U7 20-TSSOP(PW) Texas Instruments SN74AHC245PWR Octal bus transceiver, 3-state

35 1 SN74AHC138 U8 16-TSSOP (PW) Texas Instruments SN74AHC138PWR 3-line to 8-line decoder/demultiplexer

36 1 REF1004-2.5 U9 8-SOP(D) Texas Instruments REF1004-2.5 Micropower voltage reference

37 1 SN74AHC1G04 U12 5-SOT(DBV) Texas Instruments SN74AHC1G04DBVR Single inverter gate

38 2 10 ×2×0.1 P1 P2 10 ×2×0.1_SMT_PL Samtec SSW-110-22-S-D-VS 0.025" SMT socket - bottom sideUG_& _SOCKET of PWB

39 2 Samtec TSM-107-01-T-D-V-P 0.025" SMT plug - top side ofPWB

40 1 Data Bus P3 10 ×2×0.1_SMT_PL Samtec SSW-116-22-S-D-VS 0.025" SMT socket - bottom sideUG_& _SOCKET of PWB

41 1 Samtec TSM-116-01-T-D-V-P 0.025" SMT plug - top side ofPWB

42 1 Power Supply J1 5 ×2×0.1_SMT_SOC Samtec SSW-105-22-S-D-VS 0.025" SMT socket - bottom sideKET of PWB

43 1 Samtec TSM-105-01-T-D-V-P 0.025" SMT plug - top side ofPWB

44 1 SMA_PCB_MT J2 SMA_JACK Johnson Components Inc. 142-0701-301 Right angle SMA connector

45 1 7 ×2×0.1 J3 7 ×2×0.1_SMT_PLU Samtec SSW-107-22-S-D-VS 0.025" SMT socket - bottom sideG_&_ SOCKET of PWB

46 1 Samtec TSM-107-01-T-D-V-P 0.025" SMT plug - top side ofPWB

47 1 SW-PB S1 EVQ-PJ Panasonic EVQ-PJU04K switch

48 5 W1 W2 W3 W4 W5 3POS_JUMPER Samtec TSW-103-07-L-S 3 Position jumper _ 0.1" spacing

49 1 SJP2 SJP5 SJP2 NOT INSTALLED NOT INSTALLED Pad 2 position jumper

50 5 SJP3 SJP1 SJP2 SJP4 SJP6 SJP3 NOT INSTALLED NOT INSTALLED Pad 3 position jumperSJP7

51 1 TO_0.025 TP1 test_point2 Keystone Electronics 5002K-ND Test point, PC, mini 0.040" D,white

52 10 TO_0.025 TP3 TP4 TP6 TP8 TP9 test_point2 Keystone Electronics 5000K-ND Test point, PC, mini 0.040" D, redTP10 TP11 TP12 TP14TP15

53 4 TO_0.025 TP5 TP7 TP2 TP13 test_point2 Keystone Electronics 5001K-ND Test point, PC, mini 0.040" D,black

ADS7881EVM/ADS7891EVM Bill of MaterialsSLAU150 – December 2004 9

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Appendix B ADS7881EVM/ADS7891EVM Layout

Appendix B

Figure B-1. Top Layer – Layer 1

ADS7881EVM/ADS7891EVM Layout10 SLAU150 – December 2004

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