Texas Instruments ADS8380EVM Manuale utente

User's GuideSLAU146 – December 2004

ADS8380EVM

This user's guide describes the characteristics, operation, and use of the ADS838018-bit, 600-kHz, high-speed, serial interface analog-to-digital converter evaluationboard (EVM). A complete circuit description, schematic diagram, and bill of materialsare included.

The following related documents are available on the TI Web site at www.ti.com .

Data Sheets: Literature Numbers:ADS8380 SLAS387REF1004C-2.5 SBVS002SN74AHC1G125 SCLS377THS4031 SLOS224OPA132 SBOS054

Contents1 EVM Overview ............................................................................................................... 22 Analog Interface .............................................................................................................. 23 Digital Interface .............................................................................................................. 44 Power Supplies .............................................................................................................. 55 Using the EVM ............................................................................................................... 66 ADS8380EVM Bill Of Materials ............................................................................................ 78 Board Layers ................................................................................................................. 99 Schematics .................................................................................................................. 13

List of Figures

1 Input Buffer Circuit ........................................................................................................... 32 Top Layer ..................................................................................................................... 93 Power Plane ................................................................................................................ 104 Ground Plane ............................................................................................................... 115 Bottom Layer ................................................................................................................ 12

List of Tables

1 Analog Input Connector ..................................................................................................... 22 Jumper Setting ............................................................................................................... 43 Pinout for Serial Control Connector P2 ................................................................................... 54 Power Supply Test Points .................................................................................................. 55 Power Connector J2 Pinout ................................................................................................ 57 ADS8380EVM Bill of Materials ............................................................................................. 7

ADS8380EVMSLAU146 – December 2004 1

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1 EVM Overview

1.1 Features

2 Analog Interface

2.1 Signal Conditioning

EVM Overview

•Full-featured evaluation board for the ADS8380 18-bit, 600-kHz, single-channel, high-speedserial-interface analog-to-digital converter (ADC)•Onboard signal conditioning•Onboard reference•Input and output digital buffer

The ADS8380 analog-to-digital converter has both a positive and negative analog input pin. A signal forthe positive input pin can be applied at connector P1, pin 2 (shown in Table 1 ) or applied to the center pinof SMA connector J1. The EVM ships with the negative input pin shorted to ground close to the converterusing via SJP7. The negative and positive input pins have a range of -200 mV to +200 mV and -200 mVto VREF+200 mV, respectively.

Table 1. Analog Input Connector

Description Signal Name Connector Pin No. Signal Name Description

Inverting Input –IN P1.1 P1.2 +IN Noninverting InputReserved N/A P1.3 P1.4 N/A ReservedReserved N/A P1.5 P1.6 N/A ReservedReserved N/A P1.7 P1.8 N/A ReservedGround AGND P1.9 P1.10 N/A ReservedGround AGND P1.11 P1.12 N/A ReservedReserved N/A P1.13 P1.14 N/A ReservedGround AGND P1.15 P1.16 N/A ReservedGround AGND P1.17 P1.18 N/A ReservedReserved N/A P1.19 P1.20 REF+ External Reference Input

It is a recommended practice to buffer the analog input to any SAR-type converter with a high-speed,fast-settling, low-noise amplifier. The amplifier circuit shown in Figure 1 is the buffer circuit used on theADS8380EVM. This circuit consists of the THS4031, a high-speed, low-noise, low-distortion amplifierconfigured as an inverting gain of one. The circuit shown in Figure 1 was optimized to achieve the acspecifications (i.e., SNR, THD, SFDR, etc.) listed in the ADS8380 data sheet. The 12- Ωseries resistorworks with the capacitor to filter the input signal, but also isolates the amplifier from the capacitive load.The 6800-pF capacitor to ground at the input of the ADC works with the series resistor to filter the inputsignal, behaves like a charge reservoir, and provides a short to ground for high-frequency noise andkickback currents when the device switches from hold to sample mode. This external filter capacitor alsoworks with the amplifier to charge the internal sampling capacitor during sampling mode.

The type of input capacitors used in the signal path can make a few decibels of difference in acperformance. Polypropylene or C0G-type capacitors are recommended for the input signal path.Polypropylene capacitors cause the least distortion of the input signal and have excellent long-termstability, but are expensive and bulky. C0G ceramic capacitors cost less, come in smaller packages, andperform as well as polypropylene capacitors in many applications, but are not as stable over time andtemperature. The 68-pF and 6800-pF capacitors installed on the EVM are low-cost C0G type,manufactured by TDK Corporation.

ADS8380EVM 2 SLAU146 – December 2004

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THS4031

0.1 F

1 F

0.1 F

−VCC

+VCC

604 

VIN

12 

6800 pF

1 F

100 

10 k

4.096 V

IN+

IN−

2.2 Reference Voltage

Analog Interface

Figure 1. Input Buffer Circuit

The ADS8380EVM allows the designer to select internal, onboard, or user-supplied reference-voltagesources. The internal reference is a 4.096-V reference voltage generated by the ADS8380 on pin 9. Theonboard reference can be either a REF3040 (U1) or REF1004-2.5 (U13). The EVM ships with theREF1004-2.5 installed. The reference amplifier, U3, is set for a gain of 1.6, enabling it to take a 2.5-Vinput and output 4.1 V for use with the converter, or as part of the dc offset voltage circuit for the inputbuffer (U4). The user-supplied reference voltage is applied to connector P1, pin 20 and can be routedthrough the reference buffer and filtered, if desired. The EVM allows a number of configurations. SeeTable 1 for jumper settings or the full schematic in Section 9 for more information. The common SOICfootprint of U13 allows users to evaluate this converter with various reference ICs.

The ADS8380EVM ships with the internal reference tied directly to the reference pin of the converter.

SLAU146 – December 2004 3ADS8380EVM

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3 Digital Interface

Digital Interface

Table 2. Jumper Setting

Reference Pins/PadsDescriptionDesignator

1-2 2-3

SJP1 Buffer onboard reference (REF1004-2.5) Shorted

(1)

OpenBuffer user-supplied reference voltage applied at P1 pin 20 Open ShortedSJP2 Connect external reference directly to SJP4 Shorted

(1)

OpenConnect buffered external reference to SJP4 Open ShortedSJP3 Connect U2 negative supply to ground Shorted OpenConnect U2 negative supply to –VCC Open Shorted

(1)

SJP4 Connect internal reference to REFIN Shorted

(1)

OpenConnect external reference to REFIN Open ShortedSJP5 Connect U4 negative supply to ground Shorted OpenConnect U4 negative supply to –VCC Open Shorted

(1)

SJP6 Connect DC offset voltage to U4 Shorted

(1)

N/ASJP7 Connect -IN pin to analog ground Shorted

(1)

N/AW1 Connect +5VD to BVDD Shorted

(1)

OpenConnect +3.3VD to BVDD Open ShortedW2 Set signal straight binary/2s complement ( SB/2C) high Shorted N/AW3 Set power down signal (PD) high Shorted N/AW4 Set frame sync signal (FS) high Shorted N/AW5 Set chip select signal ( CS) low Shorted N/A

(1)

Factory Installed

The ADS8380EVM is designed for easy interfacing to multiple platforms. Samtec plug and socketconnectors provide a convenient dual row header/socket combination at P1 and P2 to plug into prototypeboards or through ribbon cable to user system boards.

The digital input and output signals for the converter is available at connector P2 on the ADS8380EVM;see Table 3 for the connector pinout.

4 SLAU146 – December 2004ADS8380EVM

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4 Power Supplies

Power Supplies

Table 3. Pinout for Serial Control Connector P2

Description Signal Name Connector Pin Signal Name Description

Chip Select CS P2.1 P2.2 SB/2C Straight binary or 2s complement outputSerial Clock SCLK P2.3 P2.4 DGND GroundReserved N/A P2.5 P2.6 N/A ReservedFrame Sync FS P2.7 P2.8 N/A ReservedReserved N/A P2.9 P2.10 N/A ReservedReserved N/A P2.11 P2.12 N/A ReservedSerial Data Out SDO P2.13 P2.14 N/A ReservedBUSY BUSY P2.15 P2.16 N/A ReservedConvert Start CONVST P2.17 P2.18 DGND GroundPower down PD P2.19 P2.20 N/A Reserved

The EVM accepts four power supplies:•A dual ±Vs dc supply for the dual-supply operational amplifiers. The maximum recommended voltageis ±12 Vdc.•A single +5-Vdc supply for the analog section of the board (A/D + Reference).•A single +5-Vdc or +3.3-Vdc supply for the digital section of the board (A/D + buffers).

There are two ways to provide these voltages. The first way is to connect the voltages to the test pointslisted in Table 4 .

Table 4. Power Supply Test Points

Test Point Signal Description

TP1 +VA Connect +12-Vdc supply for amplifierTP2 –VA Connect –12-Vdc supply for amplifierTP3 +BVDD Apply +3.3 Vdc or +5 Vdc. See ADC data sheet for full range.TP4 +AVCC Apply +5 Vdc

The second way is to use the power connector J2 and derive the voltages elsewhere. Table 5 gives thepinout for J2. If using this connector, set W1 jumper to connect +3.3VD or +5VD from J2 to +BVDD. Shuntpins 1-2 to select +5VD, or pins 2-3 to select +3.3VD as the source for the digital buffer voltage supply(+BVDD).

Table 5. Power Connector J2 Pinout

Signal J2 Pin Signal

+VA(+12V) 1 2 –VA(–12 V)+5VA 3 4 N/CDGND 5 6 AGNDN/C 7 8 N/C+3.3VD 9 10 +5VD

ADS8380EVMSLAU146 – December 2004 5

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5 Using the EVM

5.1 Reference Design

5.2 Prototype Board

5.3 Software Test Platform

Using the EVM

The ADS8380EVM serves three functions:1. As a reference design2. As a prototype board3. As a software test platform

As a reference design, the ADS8380EVM contains the essential circuitry to showcase the analog-to-digitalconverter. This essential circuitry includes the input amplifier, reference circuit, and buffers. The EVManalog-input circuit is optimized for a 100-kHz input signal; therefore, users may need to adjust theresistor and capacitor values to accommodate higher frequencies. In ac-type applications where signaldistortion is a concern, polypropylene or C0G-type capacitors are recommended for use in the signal path.

As a prototype board, the buffer circuit has resistor pads for configuring the input as either single-ended orfully differential input. The input circuit can be modified to accommodate user prototype needs, whether itbe evaluating another differential amplifier or limiting noise for best performance. The analog, power, anddigital connectors can be made to plug into a standard 0.1-in. breadboard or ribbon cables to interfacedirectly to FPGAs or processors.

As a software test platform, connectors P1 and P2 plug into the serial interface connectors of the 5-6KInterface Board. The 5-6K Interface Board plugs into the TMS320C5000 and TMS320C6000 Digital SignalProcessor starter kits (DSK). See the 5-6K Interface Board User’s Guide (SLAU104 ) for more information.

ADS8380EVM 6 SLAU146 – December 2004

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6 ADS8380EVM Bill Of Materials

ADS8380EVM Bill Of Materials

The following table contains a complete bill of materials for the ADS8380EVM. The schematic diagram isalso provided for reference. Contact the Product Information Center or email [email protected] forquestions regarding this EVM.

Table 7. ADS8380EVM Bill of Materials

Item Reference Manufacturer'sQTY Value Footprint Manufacturer DescriptionNo. Designator Part Number

1 1 49.9 ΩR1 805 Panasonic - ECG or ERJ-6ENF49R9V RES 49.9 Ω1/10W 1% 0805 SMDAlternate

2 1 1.2 k ΩR2 603 Yageo America or 9C06031A1201FKHFT RES 1.20 k Ω1/10 W 1% 0603 SMDAlternate

3 2 NI R4, R5 805 Not Installed Not Installed

4 3 0 ΩR6, R15, R30 603 Panasonic - ECG or Alter- ERJ-3GEY0R00V RES 0 Ω1/16 W 5% 0603 SMDnate

5 7 10 k ΩR7, R8, R9, 603 Panasonic - ECG or ERJ-3EKF1002V RES 10 K Ω1/16 W 1% 0603 SMDR10, R11, AlternateR12, R32

6 1 10 k ΩR13 BOURNS Bourns 3214W-1-103E TRIMPOT 10 K Ω4MM TOP ADJ SMD_32X4W

7 1 768 ΩR14 603 Panasonic - ECG or ERJ-3EKF7680V RES 768 Ω1/16 W 1% 0603 SMDAlternate

8 2 0 ΩR16, R17 805 Panasonic - ECG or ERJ-6GEY0R00V RES 0 Ω1/10 W 5% 0805 SMDAlternate

9 2 604 ΩR18, R19 805 Panasonic - ECG or ERJ-6ENF6040V RES 604 Ω1/10 W 1% 0805 SMDAlternate

10 1 100 ΩR20 805 Panasonic - ECG or ERJ-6ENF1000V RES 100 Ω1/10 W 1% 0805 SMDAlternate

11 1 12 ΩR21 805 Panasonic - ECG or ERJ-6GEYJ120V RES 12 Ω1/8 W 5% 0805 SMDAlternate

12 8 100 R22, R23, 603 Panasonic - ECG or ERJ-3EKF1000V RES 100 Ω1/16 W 1% 0603 SMDR24, R25, AlternateR26, R27,R28, R29

13 1 1 k ΩR31 603 Panasonic - ECG or ERJ-3EKF1001V RES 1 k Ω1/16 W 1% 0603 SMDAlternate

14 1 49.9 k ΩR33 805 Panasonic - ECG or ERJ-6ENF4992V RES 49.9 k Ω1/10 W 1% 0805 SMDAlternate

15 1 47 µF C1 1206 TDK Corporation or C3216X5R0J476M CAP CER 47 µF 6.3 V X5R 20% 1206Alternate

16 5 1 µF C2, C3, C4, 805 TDK Corporation or C2012X7R1E105K CAP CER 1 µF 25 V X7R 0805 T/RC5, C31 Alternate

17 8 NI C6, C7, C21, 603 Not Installed Not Installed Multilayer CeramicC23, C44,C45, C59, C60

18 4 0.1 µF C8, C9, C10, 805 TDK Corporation or C2012X7R1E104K CAP CER 0.1 µF 25 V X7R 10% 0805C11 Alternate

19 12 0.1 µF C12, C13, 603 TDK Corporation or C1608X7R1E104K CAP CER 0.1 µF 25 V X7R 10% 0603C16, C17, AlternateC18, C52,C53, C54,C55, C56,C57, C58

20 6 2.2 µF C14, C15, 603 TDK Corporation or C1608X5R1A225MT CAP CER 2.2 µF 6.3 V X5R 20% 0603C19, C20, AlternateC28, C50

21 3 NI C22, C32, R3 805 Not Installed Not Installed Multilayer Ceramic

22 1 10 µF C24 3528 Kemet or Alternate T491B106K016AS CAPACITOR TANT 10 µF 16 V 10% SMD

23 8 0.01 µF C25, C26, 603 TDK Corporation or C1608X7R1H103KT CAP CER 10000 pF 50 V X7R 10% 0603C27, C29, AlternateC30, C42,C43, C51

24 1 6800 µF C33 805 TDK Corporation or C2012C0G1H682J CAP CER 6800 pF 50 V C0G 5% 0805Alternate

25 4 10 µF C34, C35, 1206 TDK Corporation or C3216X5R1C106KT CAP CER 10 µF 16 V X5R 20% 1206C36, C37 Alternate

26 4 10 µF C38, C39, 6032 Pansonic - ECG or ECS-T1EC106R CAP 10 µF 25 V Tantalum TE SMDC40, C41 Alternate

27 5 1000 pF C46, C47, 603 TDK Corporation or C1608C0G1H102KT CAP CER 1000 pF 50 V C0G 0603 T/RC48, C49, C62 Alternate

ADS8380EVMSLAU146 – December 2004 7

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ADS8380EVM Bill Of Materials

Table 7. ADS8380EVM Bill of Materials (continued)Item Reference Manufacturer'sQTY Value Footprint Manufacturer DescriptionNo. Designator Part Number

28 1 1 µF C61 603 TDK Corporation or C1608X5R1A105KT CAP CER 1 µF 10 V X5R 10% 0603Alternate

29 4 MMZ2 L1, L2, L3, L4 805 TDK Corporation or MMZ2012R601A FERRITE CHIP 600 Ω500 mA 0805012R6

01A

30 1 NI U1 3-SOT-23 Not Installed Not Installed REF3040 SOT23-3 CMOS Voltage Refer-ence

31 1 OPA132 U2 8-SOP(D) Texas Instruments OPA132U High-Speed FET-Input Operational Amplifier

32 8 SN74X1G125 U3, U6, U7, 5-SOT(DBV) Texas Instruments SN74AHC1G125DBVR Single Bus Buffer Gate/Line Driver withU8, U9, U10, 3-State OutputU11, U12

33 1 THS4031 U4 8-SOT(D) Texas Instruments THS4031CD 100-MHz Low-Noise High-Speed Amplifier

34 1 ADS8380 U5 28-PQFP Texas Instruments ADS8380IBRHPT 18-Bit 600 kSPS Serial Analog-to-Digital(QFN) Converter

35 1 REF1004-2.5 U13 8-SOP(D) Texas Instruments REF1004C-2.5 2.5-V Micropower Voltage Reference

36 1 SMA_PCB_ J1 SMA_JACK Johnson Components Inc. 142-0701-301 Right Angle SMA ConnectorMT

37 1 Power Supply J2 5X2X.1_ Samtec SSW-105-22-S-D 0.025-In. SMT Socket - Bottom Side of PWBSMT_Socket -VS

38 1 Samtec TSM-105-01-T-D-V 0.025-In. SMT Plug - Top Side of PWB-P

39 2 10X2X.1 P1, P2 10X2X.1 Samtec SSW-110-22-S-D-VS 0.025-In. SMT Socket - Bottom Side of PWB_SMT_P

LUG_&_

SOCKET

40 2 Samtec TSM-110-01-T-D-V-P 0.025-In. SMT Plug - Top Side of PWB

41 1 3POS_ W1 3pos_jump Samtec TSW-103-07-L-S 3-Position Jumper_0.1-In. SpacingJUMPER

42 4 2POS_ W2, W3, W4, 2pos_jump Samtec TSW-102-07-L-S 2-Position Jumper_0.1-In. SpacingJUMPER W5

43 2 SJP2 SJP6, SJP7 SJP2 Not Installed Not Installed Pad 2 Position Jumper

44 5 SJP3 SJP1, SJP2, SJP3 Not Installed Not Installed Pad 3 Position JumperSJP3, SJP4,SJP5

45 10 TP_.025 TP1, TP2, test_point2 Keystone Electronics 5000K-ND Test Point PC Mini 0.040-In. D RedTP3, TP4,TP5, TP6,TP7, TP8,TP10, TP13,

46 4 TP_0.25 TP9, TP11, test_point2 Keystone Electronics 5001K-ND Test Point PC Mini 0.040-In D BlackTP12, TP14

ADS8380EVM 8 SLAU146 – December 2004

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8 Board Layers

Board Layers

Figure 2. Top Layer

ADS8380EVMSLAU146 – December 2004 9

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Board Layers

Figure 3. Power Plane

ADS8380EVM 10 SLAU146 – December 2004

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