EVALUATION FIXTURE ANALOG BREADBOARD AREA DIGITAL BREADBOARD AREA

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EVALUATION FIXTURE ANALOG BREADBOARD AREA DIGITAL BREADBOARD AREA

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DEM-ADS78DIP
EVALUATION FIXTURE
ANALOG BREADBOARD AREA DIGITAL BREADBOARD AREA FLEXIBLE CLOCK PROGRAMMING FLEXIBLE REFERENCE VOLTAGE PROGRAMMING STAND-ALONE CAPABILITY
DESCRIPTION
DEM-ADS78DIP evaluation fixture designed quick evaluation Burr-Brown's line 8-pin plastic analog-to-digital converter including, ADS1286, ADS7816, ADS7817, ADS7818, ADS7822, ADS7834, ADS7835. Although these products available other package types, such MSOP, SSOP, SOIC, DEM-ADS78DIP provides excellent evaluate these products their packages with board. board features that allow user evaluate functions these converters. options offered user includes easily configurable voltage reference, flexible clock generator circuit, analog breadboard, digital breadboard isolated digital breadboard areas. Optional power supply connections also available DEM-ADS78DIP board assist evaluation possible transducer input circuits analog breadboard well digital isolation circuits isolated digital breadboard. DEMADS78DIP been designed accommodate standalone operation, allowing user easily connect external processor.
APPLICATIONS
SMALL DYNAMIC RANGE DIGITIZING ISOLATED DATA ACQUISITION TRANSDUCER INTERFACE BATTERY OPERATED SYSTEMS
International Airport Industrial Park Mailing Address: 11400, Tucson, 85734 Street Address: 6730 Tucson Blvd., Tucson, 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
1997 Burr-Brown Corporation
LI-491B
Printed U.S.A. April, 1998
SBAU006
USING VARIOUS CONVERTERS WITH THIS BOARD product line that compatible with this evaluation fixture listed Table This product line features power operation with automatic power down, asynchronous serial interface differential input. reference voltage varied order change input range
consequently size. power, automatic power down, small size make these converters ideal battery operated systems. They also ideal remote isolated data acquisition applications. Although this evaluation fixture designed evaluate devices 8-pin DIP, each product surface-mount option available.
0.1µF 0.1µF Reference Select OPA234P Input Control 100k 100k 100k 0.1µF ADG608BN
ANODE CATHODE CATHODE
REF1004-2.5
49.9
47µF
BB19
VREF
0.1µF Voltage Select ADS7822PD VREF
VIN+ VIN+
IN/OUT
VIN- 2.2µF 2.2µF VIN- +VCC
SDATA
74AC11004
74AC11004 CS/SHDN
Breadboard SDATA BB17 BB18 Breadboard CS/SHDN Breadboard CLOCK
BB16
CLOCK 49.9
2.2µF
-VCC
74AC11004 BB10 74AC11074
Clock Select 74AC11004
Timing Select
2.2µF
+VISO
BB11
74AC11074
GNDISO
BB12
CS/SHDNISO
BB13
0.1µF 32MHz
74AC11074 74hc390n
SDATAISO
BB14
CLOCKISO
BB15
Slider
CTX129-ND
74HC163N
0.1µF
74AC11074
Control
0.1µF
74hc390n
Slider Slider Slider
100k
100k
100k
100k
FIGURE DEM-ADS78DIP Circuit Diagram.
DEM-ADS78DIP
PRODUCT ADS1286 ADS7816 ADS7817 ADS7818 ADS7822 ADS7834 ADS7835
CLOCK RATE 320kHz 3.2MHz 3.2MHz 8MHz 1.6MHz 8MHz 8MHz
SAMPLE RATE 20kHz 200kHz 200kHz 500kHz 100kHz 500kHz 500kHz
VREF RANGE 0.1V 0.1V 0.4V 2.55V 0.1V 2.55V 2.55V
J3-E. This type flexibility allows user easily attach inputs input terminal block, breadboard, ground. input jumper connections (J3) shown Figure summarized Table Optional input networks (J3-A J3-H) designed allow user generate offset from power supply input pin(s) design pass filter. Both configurations shown Figure
JUMPER POSITION
TABLE Some Products that Demonstrated with this Fixture Shown Above.
DESCRIPTION Connects (VIN-) through adjustable network. Connects (VIN-) directly input connector VIN- Connects (VIN-) breadboard center analog breadboard area. Connects (VIN-) GND. Connects (VIN+) GND. Configures (VIN+) directly breadboard bus. Configures (VIN+) input connector VIN+ Connects (VIN+) through adjustable network.
DEM-ADS78DIP BOARD DESCRIPTION
circuit diagram DEM-ADS78DIP shown Figure This demonstration fixture four fundamental active sections board which eases evaluation process Device Under Test (DUT). These sections analog input, voltage reference block, clock generation network digital interface. Each section configurable accommodate differences between 8pin products available from Burr-Brown. socket (U5) allows easy evaluation number converters without doing tedious soldering desoldering. Additionally, analog digital breadboard sections available event user requires further customization circuit. power supply terminal block should connected with (nominal). available optional supply terminal blocks powered discretion user. There five jumpers (J3, board that allow flexibility needed during evaluation phase DUT. directly connected clock generation network. This network divides oscillator clock, 100. further enhance flexibility clocking capability, used jumper external clock into circuit. Finally, used select voltage reference source (VREF). jumper options listed Tables through Each four active sections three breadboard sections discussed below. ANALOG INPUT SECTION analog inputs accessible from terminal block from center signal busses analog breadboard area. cases, must properly configured. inverting non-inverting analog inputs converter (DUT socket) available from pins inclusive. These pins connected four pins jumper, inverting input converter (DUT connected pins J3-A, J3-B, J3-C J3-D. non-inverting input converter (DUT connected pins J3-H, J3-G, J3-F
TABLE Input Configuration Jumper. Both inputs (pins must connected three options described above order obtain sensible output.
VIN+ thru Network VIN+ VIN+ Analog Breadboard Analog Breadboard VIN- Analog Breadboard VIN- VIN- thru Network
FIGURE Analog Input Jumper Configuration, analog breadboard section, located nearest DUT, provided allow user configure their front circuits. Nine power signal busses conjunction with supply terminals provide enough flexibility this area, making easy build desired analog and/or reference circuit. nine power signal busses separated into three groups; VREF, GND, +VD, VIN+, GND, VIN-, +VCC, GND, -VCC (see Figure detailed layout). VREF connected directly converter's reference (pin This allows user design build custom reference circuits analog breadboard. VREF
DEM-ADS78DIP
2.5V Level P2-1 P2-3 J3-H J3-A Converter (DUT)
signal from 100, described Table III. This entire clock section powered down removing jumper top. external clock connected connector, (EXT CLK). best performance achieved with clock duty cycle case J4-A J4-D). external clock instead J4-B J4-C recommended best results. cases, refer Table correct jumper configuration.
JUMPER POSITION FACTORY FREQUENCY 1.6MHz 320kHz 3.2MHz 8MHz BEST SUITED ADS7822 ADS1286 ADS7616 ADS7817 ADS7818 ADS7834 ADS7835
DESCRIPTION Divides clock oscillator, Divides clock oscillator, 100. Divides clock oscillator, Divides clock oscillator,
P2-1 P2-3
J3-H J3-A
Converter
Low-Pass Filter
TABLE III. Clock Divider Control. stated factory frequency assumes 32MHz clock oscillator inserted
JUMPER POSITION
FIGURE network input (J3-H J3-A) configured provide level shift input signal pass filter (b). used, should open. between VREF busses. This same that connected power supply terminal, third this area +VD. powered from terminal block, This terminal block powers must compliance with DUT's specified power supply range. This terminal block also supplies power other devices board. VIN+ VIN-, along with another bus, placed through center analog breadboard area. VIN+ VIN- made available analog breadboard connecting appropriate jumper with described Table II). also connected power supply terminal, third group power consists VCC+, GND, VCC-. VCC+ VCC- independent supplies that powered through supply terminal, Note: Some devices this board have power supply labels +VCC their data sheet. This same VCC+ connection board. These supplies value, dependent user's needs. connections analog breadboard area also used ground reference devices installed remainder board. CLOCK CIRCUITRY clock section board consists U10, 32MHz oscillator chip installed socket. This chip replaced deemed necessary user. used divide clock
DESCRIPTION Selects clock input come from Clock Divider portion demo board. configure desired frequency. Selects clock input come from External Clock connector,
TABLE External Clock Control. U10, provided control function device. 4-bit Synchronous Binary Center. conjunction with (D-type Flip Flop) programmed 12-bit, 10-bit 8-bit operation. Refer Table details. disconnects this function completely.
SLIDER POSITION clock cycles clock cycles conversion 12-bit operation. clock cycles clock cycles conversion 10-bit operation. clock cycles clock cycles conversion 8-bit operation clock cycles clock cycles clock cycles, etc. DESCRIPTION
TABLE Control. VOLTAGE REFERENCE BLOCK voltage that supplied converter provided through five sources; external reference (P5, VREF), precision 2.5V reference (U2), digital programmable reference J10), power supply
DEM-ADS78DIP
SWITCH POSITIONS
MATHEMATICAL VALUE through changed user) (R4)/(R4 +R8) R7)/(R4 R6)/(R4 R5)/(R4
FACTORY VOLTAGE
TABLE VII. J10: Multiplexed Reference Voltage Selection. other switch settings invalid, however, other combinations will cause damage. Don't Care).
JUMPER POSITION
CONNECTOR even pins
DESCRIPTION Voltage Reference Input selected digitally programmable reference, implemented with J10, This voltage reference function fully implemented with selection this jumper conjunction with instructions found Table Voltage Reference Input selected power supply voltage, +VD. Voltage Reference Input selected connected REF1004-2.5, 2.5V precision reference (U2). Voltage Reference Input selected come from VREF connector, converter internal reference (such ADS7818) reference circuit built analog breadboard area soldered VREF bus.
DESCRIPTION Interface through (analog multiplexer) Slider Table Interface through (analog multiplexer) Slider Table Interface through (analog multiplexer) Slider Table Clock interface clock section board DATA interface from CS/SHDN interface Interface through control), Slider Table Interface through control), Slider Table Interface through control), Slider Table Interface through control), Slider Table
Jumper
TABLE Reference Voltage Configuration.
TABLE VIII. Interface DEM-ADS78DIP Evaluation Fixture. Isolated Digital Breadboard Area isolated digital breadboard section laid such that power supply terminals (VCC GND) (+VD, GND) connected power planes this section (see Figure terminal blocks, provided allow user easy access power busses CS/SHDNISO (P8), SDATAISO (P8), CLKISO (P8), +VISO (P7) GNDISO (P7). This breadboard section designed allow user breadboard isolated power isolated signal interface DEM-ADS78DIP board. This accomplished separating power ground planes isolated breadboard section from rest board. This area designed withstand high isolation voltages. been included help designer evaluate effects isolated power sources such converters.
from circuit built analog breadboard area. origin voltage reference configured using jumper, Table jumper placed position analog multiplexer (U3) used switch various voltages reference DUT. sockets through allow easy insertion standard through-hole resistors. With these sockets user easily configure custom array reference voltages DUT. Table details. DIGITAL BREADBOARD Non-isolated Digital Breadboard Area non-isolated digital breadboard area shown Figure five power/signal busses available. connected directly power terminal, having nominal voltage +5V. directly connected board ground plane. connected directly DUT's CS/SHDN (pin SDATA connected directly DUT's DOUT (pin connected directly clocking network (per Tables DUT's DCLOCK (pin
DEM-ADS78DIP
DIGITAL INTERFACE converter, analog multiplexer (U3) onboard clock accessible through digital interface socket, even pins connected board (per power terminal, P4). Table VIII more details. remainder layout information shown Figures through Table summarizes external terminal connections DEM-ADS78DIP board well connections from breadboard evaluation fixture circuitry. parts list this evaluation fixture listed Table
DESCRIPTION Voltage Reference Non-inverting Input Inverting Input Ground
NAME VREF
BREADBOARD NUMBER NAME TERMINAL #/PIN VREF VIN+ VIN- P2/1 P2/3 P2/2 P3/2 P4/2 Even Pins
Chip Select /Shut Down Digital Clock Input Power Supply Auxiliary Breadboard Power Supply Auxiliary Breadboard Power Supply Isolated Isolated Isolated Isolated Power Isolated Ground Plane
CS/SHDN DOUT DCLOCK +VCC
SDATA +VCC -VCC CS/SHDNISO SDATAISO CLOCKISO +VISO GNDISO
P1/47 P1/45 P1/43 P4/1 P3/1 P3/3 P8/1 P8/2 P8/3 P7/1 P7/2
TABLE General Summary External Connections Breadboard Connections DEMADS78DIP Evaluation Fixture.
DESIGNATOR R1-R3, R9-R12, R24, R27, R30, R4-R8, R15-R17, R22, R25, R28, R18-R20, R23, R26, R29, R13, C1-C4, C10-C14 C5-C8 J10, DESCRIPTION Single-Supply Amp, PDIP 2.5V Reference, Surface Mount Single-Supply Analog Multiplexer Digital Buffer 8-pin, 12-Bit Converter 32MHz Clock Oscillator Dual D-Type Flip-Flop 4-Bit Synchronous Binary Counter Dual Decade Counter 100, 0.125W, Resistor 0.125W, Resistor 10k, 0.125W, Resistor 100k, 0.125W, Resistor 49.9, 0.125W, Resistor 0.1µF, 50VX7R Ceramic Capacitor 47µF, 10V, 10%, Tantalum Dipped Radial 2.2µF, Tantalum Dipped/Radial, 25V, Contact, Right-angle, Connector 3-Pin Term Block 2-Pin Term Block Connector, Mount Switch Low-Profile Jumper Tops DEM-ADS78DIP Board Socket Socket Socket 20-pin, Socket 8-pin Socket 14-pin Oscillator Socket PART NUMBER OPA234P REF1004C-2.5 ADG608BN 74AC11004 ADS7816P CTX129-ND 74AC11074 74HC163N 74HC390N RN55C1000F RN55C1001F RN55C1002F RN55C1003F RN55C49R9 CK05BX104K T350H476K010AS T350B225K025AS IDH-50LP-SR3-TG ED300/3 ED300/2 KC-79-274-M06 LD04 SNT-100-BK-T-H A2206-1 520AG-11-DES 508AG-11-DES 1107741 VENDOR(S) Burr-Brown Burr-Brown Analog Devices T.I. Burr-Brown (DigiKey T.I. T.I. T.I. Dale Dale Dale Dale Dale Kemet Kemet Kemet Robinson-Nugent On-Shore Technology On-Shore Technology King Components Samtec Burr-Brown Aries Augat Augat
TABLE Parts List.
DEM-ADS78DIP
DESCRIPTION 8-pin Converter 8-pin Converter ADS7816 Product Data Sheet ADS7817 Product Data Sheet ADS7822 Product Data Sheet DEM-ADS78DIP Product Data Sheet
PART NUMBER ADS7822P ADS7817P PDS-1355 PDS-1369 PDS-1358 LI-491
VENDOR(S) Burr-Brown Burr-Brown Burr-Brown Burr-Brown Burr-Brown Burr-Brown
TABLE Packing List.
FIGURE Component Side.
DEM-ADS78DIP
FIGURE Silkscreen.
FIGURE Solder Side.
DEM-ADS78DIP
FIGURE Soldermask.
DEM-ADS78DIP
IMPORTANT NOTICE Texas Instruments subsidiaries (TI) reserve right make changes their products discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgment, including those pertaining warranty, patent infringement, limitation liability. warrants performance semiconductor products specifications applicable time sale accordance with TI's standard warranty. Testing other quality control techniques utilized extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements. Customers responsible their applications using components. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. assumes liability applications assistance customer product design. does warrant represent that license, either express implied, granted under patent right, copyright, mask work right, other intellectual property right covering relating combination, machine, process which such semiconductor products services might used. TI's publication information regarding third party's products services does constitute TI's approval, warranty endorsement thereof.
Copyright 2000, Texas Instruments Incorporated

EVALUATION FIXTURE ANALOG BREADBOARD AREA DIGITAL BREADBOARD AREA

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