ADS7866-68 EVM Datasheet by Texas Instruments

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1 EVM Overview
1.1 Features
User's GuideSLAU181 – July 2006
ADS7866EVM/ADS7867EVM/ADS7868EVM
This Users Guide describes the characteristics, operation, and use of theADS7866/ADS7867/ADS7868 12/10/8-bit, 200/240/280-KSPS, high-speed,serial-interface analog-to-digital (A/D) converter evaluation (EVM) board. A completecircuit description as well as schematic diagram and bill of materials is included.
Contents
1 EVM Overview ...................................................................................... 1
2 Introduction .......................................................................................... 2
3 Analog Interface .................................................................................... 2
4 Digital Interface ..................................................................................... 4
5 Power Supplies ..................................................................................... 5
6 Using the EVM ...................................................................................... 5
7 ADS786xEVM BOM ................................................................................ 6
8 ADS786xEVM LAYOUT ........................................................................... 8
9 ADS786xEVM Schematic ......................................................................... 9
10 Related Documentation from Texas Instruments ............................................. 10
List of Figures
1 Input Buffer Circuit .................................................................................. 3
2 Top - Layer 1 ........................................................................................ 8
3 Ground Plane - Layer 2 ............................................................................ 8
4 Power Plane - Layer 3 ............................................................................. 9
5 Bottom - Layer 4 .................................................................................... 9
List of Tables
1 Analog Input Connector ............................................................................ 2
2 Jumper Setting ...................................................................................... 4
3 Serial Control Connector P2 ...................................................................... 4
4 Power Supply Test Points ......................................................................... 5
5 Power Connector Pin Out ......................................................................... 5
6 ADS786xEVM Bill of Materials .................................................................... 6
Full-featured evaluation module (EVM) for the ADS7866/ADS7867/ADS7868 12/10/8-bit,200/240/280-KSPS, single-channel, high-speed serial interface A/D converter.
On board signal conditioning
On board reference
TMS320C5000, TMS320C6000, TMS320C2000 are trademarks of Texas Instruments.eZdsp is a trademark of Spectrum Digital.
SLAU181 – July 2006 ADS7866EVM/ADS7867EVM/ADS7868EVM 1
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2 Introduction
3 Analog Interface
3.1 Signal Conditioning
Introduction
The ADS7866 is a 12-bit, 200-KSPS serial-interface, analog-to-digital converter (ADC). The ADS7867 is a10-bit, 240-KSPS serial-interface A/D converter. The ADS7868 is a 8-bit, 280-KSPS analog to digitalconverter. The devices include a capacitor based SAR A/D converter with inherent sample and hold. Theserial interface for each A/D converter is controlled by the two signals chip select and serial shift clock.The input signal is sampled with the falling edge of chip select, and serial shift clock is used as conversionand the serial data output clock.
The devices operate from 1.2 V up to 3.6 V, and are available in SOT23 packages. Low powerconsumption and a small size make these devices ideally suitable for battery powered, portableapplications. The ADS7866/67/68 devices are specified for operation from -40 °C to 85 °C.
The high level of the digital input to the device is not limited to device VDD. This means the digital inputcan go as high as 3.6 V when the device supply is 1.2 V. This feature is useful when digital signals arecoming from other circuit with different supply levels.
The ADS7866/ADS7867/ADS7868 A/D converters have one analog input pin. A signal for the input pincan be applied at connector P1, pin 2 (shown in Table 1 ), or applied to the center pin of SMA connectorJ1. The input range of the converter is set by the power supply voltage applied at pin 1. For example, ifVDD = 3.6 V, then V
I
can range from 0 V up to 3.6 V or 3.6 V
PP
.
Table 1. Analog Input Connector
Description Signal Name Connector.Pin Number Signal Name Description
Reserved N/C P1.1 P1.2 ( + ) VIN
Reserved N/C P1.3 P1.4 N/C Reserved
Reserved N/C P1.5 P1.6 N/C Reserved
Reserved N/C P1.7 P1.8 N/C Reserved
Pin tied to Ground AGND P1.9 P.10 N/C Reserved
Pin tied to Ground AGND P1.11 P1.12 N/C Reserved
Reserved N/C P1.13 P1.14 N/C Reserved
Pin tied to Ground AGND P1.15 P1.16 N/C Reserved
Pin tied to Ground AGND P1.17 P1.18 N/C Reserved
Reserved N/C P1.19 P1.20 EXT_REF External Reference Input
The VIN input to the ADS7866, ADS7867, and ADS7868 should be driven with a low impedance source.In many cases, an input driver is not necessary, but in those cases where the source impedance exceeds200 , using a buffer helps achieve the rated performance of the converter.
The amplifier circuit shown in Figure 1 is the buffer circuit used on the ADS7866/ADS7867/ADS788EVM.This circuit consists of the THS4031, a high-speed, low noise, low distortion amplifier configured as aninverting gain of one. The circuit shown Figure 1 is optimized to achieve the ac (i.e., SNR, THD, SFDR,etc) specifications listed in the ADS7866/ADS7867/ADS7868 datasheets. Note the input circuit mayrequire adjustments to achieve best performance for specific applications.
The 15- series resistor works with the capacitor, C20, to filter the input signal and isolates the amplifierfrom the capacitive load. The 680-pF capacitor to ground at the input of the A/D works with the seriesresistor to filter the input signal, behaves like a charge reservoir, and provides a short to ground for highfrequency noise and kickback currents when the device switches from hold to sample mode. This externalfilter capacitor also works with the amplifier to charge the internal sampling capacitor during samplingmode.
2ADS7866EVM/ADS7867EVM/ADS7868EVM SLAU181 – July 2006
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-VCC
1 Fm
+VCC
1 Fm
+2.5V
VI
300 W
THS4031
680pF
15 W
VIN
1 Fm
10kW
0
300 W
R24
R20
C5
R5
C18
U4
R13
C3
R25
C20
3.2 Reference
Analog Interface
The type of input capacitors used in the signal path can make a few decibels of difference in ACperformance. The factory recommends using either polypropylene or C0G type capacitor in the inputsignal path. The polypropylene capacitor causes the least distortion of the input signal and has excellentlong-term stability, but is bulky and expensive. The C0G ceramic is lower cost, comes in smallerpackages, and performs well in many applications. C0G capacitors however, tend to be less stable overtime and temperature when compared polypropylene capacitors. The 680-pF capacitors installed on theEVM are low cost C0G type manufactured by TDK Corporation.
Figure 1. Input Buffer Circuit
The ADS7866, ADS7867, and ADS7868 reference voltage is derived from the supply voltage internally.Consequently, the supply voltage to these converters should be driven with a low impedance source andbe decoupled to ground at the chip. It is recommended that, at least, a 1- µF and 10-nF decouplingcapacitors be placed close to the chip. The traces from these capacitors to the VDD pin should be wide,low impedance traces.
The converters themselves draw very little current from the supply lines. Therefore, the supply voltage pinfor the ADS7866, ADS7867, and ADS7868 can be connected directly to the system supply or to a lownoise and low drift reference chip. The EVM provides users the option to power the A/D converter fromeither the analog supply voltage applied at TP15 or from an onboard 2.5-V reference chip.
SLAU181 – July 2006 ADS7866EVM/ADS7867EVM/ADS7868EVM 3
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4 Digital Interface
Digital Interface
Table 2. Jumper Setting
(1)
Jumper SettingReference
DescriptionDesignator
1-2 2-3
Set negative supply of U2 to ground. Installed
(2)
SJP1
Select negative supply of U2 to -VCC. Not Installed
Set negative supply of U4 to ground. Not InstalledSJP2
Select negative supply of U4 to -VCC. Installed
(2)
Apply CS from P2.1 to the ADC Chip select pin Installed
(2)
W1
Apply FS from P2.7 to the ADC Chip select pin Not Installed
Set IOVDD to +3.3VD Installed
(2)
W2
Set IOVDD to +5VD N/A - Pin 3 Cut
Set 2.5 V to W4 (pin 3) Installed
(2)
W3
Set user applied voltage to W4 (pin 3) Not Installed
Set DUT power supply pin to 5 V N/A - Pin 1 CutW4
Set DUT power supply pin to voltage on W3 (pin 2). Installed
(2)
(1)
These jumper setting are for PWB revision B of the ADS7866EVM/7887EVM/7888EVM.(2)
Factory Installed
The ADS7866EVM/ADS7867EVM/ADS7868EVM is designed for easy interfacing to multiple platforms.Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient dual rowheader/socket combination at P1 and P2. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for avariety of mating connector options.
The digital input and output signals for the converter is made available via connector P2 on theADS7866EVM/ADS7867EVM/ADS7868EVM, see Table 3 for connector pin-out.
Table 3. Serial Control Connector P2
Description Signal Name Connector.Pin Number Signal Name Description
Chip Select CS P2.1 P2.2 N/C Reserved
Serial Clock SCLK P2.3 P2.4 DGND Ground
Reserved N/C P2.5 P2.6 N/C Reserved
Frame Sync FS P2.7 P2.8 N/C Reserved
Reserved N/A P2.9 P2.10 DGND Ground
Reserved N/C P2.11 P2.12 N/C Reserved
Serial Data Out SDO P2.13 P2.14 N/C Reserved
Reserved N/C P2.15 P2.16 N/C Reserved
Reserved N/C P2.17 P2.18 DGND Ground
Reserved N/C P2.19 P2.20 N/A Reserved
I/O buffer and level translation functions may not be required for some applications. These devices havethe high-level digital input that is not limited to the device VDD voltage, but to 4 V. This means the ADCcan be powered up at 1.2 V and interfaced to 3.3-V logic directly.
The ADS7866/ADS7867/ADS7868 output low-level and high-level voltages are 0.4 V and VDD - 0.2 V,respectively. If the ADS7866/ADS7867/ADS7868 is powered up at 3.6 V and the host processor is at1.8 V, then level translation maybe required. The output level translation function (done by U6 on theEVM) may be required depending on the host processor. Check your host processor’s data sheet for inputlogic levels.
ADS7866EVM/ADS7867EVM/ADS7868EVM 4 SLAU181 – July 2006
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5 Power Supplies
6 Using the EVM
6.1 As a Reference Board
Power Supplies
The EVM accepts four power supplies.
A dual ±V
S
dc supply for the dual supply operational-amplifiers. Recommended ±5 VDC.
A single 2.7 to 5-V dc supply for U3, the ADC supply reference (2.5-V, REF3225).
A single 1.8 to 3.3-V dc supply for digital section of the board (output buffers U6).
There are two ways to provide these voltages.
1. Wire in voltages at test points on the EVM. See Table 4 .
Table 4. Power Supply Test Points
Test Point Signal Description
TP1 +VA Apply +5 VDC. Positive supply for amplifier.
TP2 –VA Apply -5 VDC. Negative supply for amplifier.
TP3 +VDD Apply up to 3.6 VDC. See the ADC data sheet for full range.
TP15 +VCC via W3 and W4 Apply up to 3.6 VDC max and move the jumper at W3 to cover pins 2-3.
2. Use the power connector J2, and derive the voltages elsewhere. The pin out for this connector isshown in Table 5 . If using this connector, then set W2 jumper to connect +3.3VD from connector to+VDD. A short between pins 1-2 to select +3.3VD as the source for the digital I/O buffer voltage supply(+IOVDD) is the factory shipped condition.
Table 5. Power Connector Pin Out
Signal J1 Pin Signal
+VA (5 V) 1 2 –VA (–5 V)
+5VA 3 4 N/C
DGND 5 6 AGND
N/C 7 8 N/C
+3.3VD 9 10 +5VD
The voltage applied to the VCC pin of the ADC is controlled by W4. Pin 1 of W4 is cut to prevent the+5VCC from being applied to the ADC. By default, pins 2 and 3 are shorted and the reference voltageselected by W3 is powering the ADC. To monitor device current draw, the shunt jumper can be removedand replaced with a current meter. See Table 2 or the schematic drawings at the end of this user’s guideto determine how power is supplied to the various ICs on the board.
The ADS7866/ADS7867/ADS7868EVM serves three functions:
1. As a reference design
2. As a prototype board and
3. As software test platform
As a reference design, the ADS7866EVM/ADS7867EVM/ADS7868EVM contains the essential circuitry toshowcase the A/D converter. This essential circuitry includes the input amplifier, reference circuit, andbuffers. The analog input circuit is optimized for 100-kHz input signal; therefore, users may need to adjustthe resistor and capacitor values to accommodate higher frequencies and different test systems. Inac-type applications where signal distortion is concern, care should be taken to insure polypropylene orC0G type capacitors are used in the signal path.
The design and layout of this EVM, in conjunction with the ADC data sheet, can be used as the guidewhen incorporating this ADC into the user system board.
SLAU181 – July 2006 ADS7866EVM/ADS7867EVM/ADS7868EVM 5
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6.2 As a Prototype Board
6.3 As a Software Test Platform
7 ADS786xEVM BOM
ADS786xEVM BOM
As a prototype board, the buffer circuit consists of resistor pads for configuring the input as either invertingor noninverting configurations. The input circuit can be modified to accommodate user prototype needs,whether it be evaluating another amplifier or limiting noise for best performance. The analog, power, anddigital connectors can be made to plug into a standard 0.1 inch 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 card. The 5-6K interface card plugs into the TMS320C5000™ DSP and TMS320C6000™ DSPstarter kits (DSK). See the 5-6K interface card user’s guide (SLAU104 ) for more information.
Connectors P1 and P2 also plug into the serial interface connectors of the HPA-MCU Interface Board. TheHPA-MCU Interface was designed for use with the TMS320C2000™ series DSP and eZdsp™ starter kitsfrom Spectrum Digital. See the HPA-MCU Interface Board user’s guide (SLAU106 ) for more information.
Table 6 contains a complete Bill of Materials for the ADS7866/67/68EVM . The schematic diagram is alsoprovided for reference. Contact the Product Information Center at (972) 644-5580 or e-maildataconvapps@list.ti.com for questions regarding this EVM. When e-mailing, please be sure to inclue theEVM name in the subject line.
Table 6. ADS786xEVM Bill of Materials
ReferenceItem No. QTY Value Mfg Mfg Part number DescriptionDesignators
1 5 NI R1 R2 R3 R4 R26 NOT INSTALLED NOT INSTALLED
Panasonic-ECG or RES 0.0 OHM 1/10W 5% 08052 1 0 R5 ERJ-6GEY0R00VAlternate SMD
Panasonic-ECG or RES ZERO OHM 1/16W 5% 06033 5 0 R6 R7 R9 R11 R12 ERJ-3GEY0R00VAlternate SMD
Panasonic-ECG or RES 100 OHM 1/16W 1% 06034 2 100 R8 R15 ERJ-3EKF1000VAlternate SMD
Yageo America or RES ZERO OHM 1/16W 5% 06035 1 140 R16 9T06031A1400DBHFTAlternate SMD
6 4 NI R10 R21 R22 R23 Not Installed Not Installed
TRIMPOT 10K OHM 4MM TOP7 1 10k R13 Bourns 3214W-1-103E
ADJ SMD
Yageo America or RES 1.00K OHM 1/10W 1% 06038 1 1k R14 9C06031A1001FKHFTAlternate SMD
Panasonic ECG or RES 10.0K OHM 1/16W 1% 06039 2 10k R18 R19 ERJ-3EKF1002VAlternate SMD
Panasonic-ECG or RES 15.0 OHM 1/16W 1% 060310 1 15 R25 ERJ-3EKF15R0VAlternate SMD
Yageo America or11 2 300 R20 R24 9C08052A3000FKHFT RES 300 OHM 18W 1% 0805 SMDAlternate
Panasonic-ECG or RES ZERO OHM 1/4W 5% 120612 1 0 R28 ERJ-8GEY0R00VAlternate SMD
13 1 NI C1 Not Installed Not Installed
TDK Corporation or CAP CER 1.0UF 10V X5R 10%14 4 1uF C2 C3 C4 C9 C1608X5R1A105KTAlternate 0603
TDK Corporation or CAP CER 1.0UF 25V X7R 080515 2 1uF C5 C18 C2012X7R1E105KAlternate T/R
TDK Corporation or CAP CER .47UF 10V X5R 10%16 1 0.47uF C8 C1608X5R1A474KAlternate 0603
17 2 NI C11 C19 Not Installed Not Installed
TDK Corporation or CAP CER .10UF 25V X7R 10%18 1 0.1uF C15 C1608X7R1E104KAlternate 0603
6ADS7866EVM/ADS7867EVM/ADS7868EVM SLAU181 – July 2006
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ADS786xEVM BOM
Table 6. ADS786xEVM Bill of Materials (continued)
TDK Corporation or CAP CER 2.2UF 6.3V X5R 20%19 1 2.2uF C17 C1608X5R1A225MTAlternate 0603
TDK Corporation or20 1 10nF C13 C1608C0G1H100D CAP CER 10PF 50V C0G 0603Alternate
TDK Corporation or CAP CER 10UF 6.3V X5R 20%21 4 10uF C22 C23 C24 C25 C2012X5R0J106MAlternate 0805
TDK Corporation or CAP CER 10UF 16V X5R 20%22 4 10uF C26 C27 C28 C29 C3216X5R1C106KTAlternate 1206
TDK Corporation or CAP CER 680PF 50V C0G 5%23 1 680pF C20 C1608C0G1H681JAlternate 0603
TDK Corporation or CAP CER 1000PF 50V C0G 5%24 4 1000pF C36 C37 C38 C39 C1608C0G1H102JAlternate 0603
MMZ2012R FERRITE CHIP 600 OHM 500MA25 3 L1 L3 L4 TDK Corporation MMZ2012R601A601A 0805
C6 C7 C10C12 C14 C2126 12 NI NOT INSTALLED NOT INSTALLED Multilayer Ceramic - 0805 SizeC30 C31 C32C33 C34 C35
low drift reference REF 3225, 3230,27 1 REF3225 U3 Texas Instruments REF3225AIDBVT
3233, 3240
100-MHz LOW-NOISE HIGH28 2 THS4031 U2 U4 Texas Instruments THS4031CD
SPEED AMPLIFIER
ADS7866IDBVR ADS7866 - 12-Bit, 200KSPS ADC29 1 DUT U5 Texas Instruments ADS7867IDBVR ADS7867 - 10-Bit, 240KSPS ADCADS7868IDBVR ADS7868 - 8-Bit, 280KSPS ADC
SN74LVC1 SINGLE BUS BUFFER GATE WITH30 1 U6 Texas Instruments SN74LVC1G07DBVRG07 OUTPUT ENABLE
31 2 W1 W2 Samtec TSW-103-07-L-S 3 Position Jumper _ .1" spacing
32 2 W3 W4 Samtec TMM-103-03-T-S 2mm low profile
0.025" SMT SOCKET - BOTTOM33 2 10X2X.1 P1 P2 Samtec SSW-110-22-S-D-VS
SIDE OF PWB
0.025" SMT PLUG - TOP SIDE of34 2 Samtec TSM-110-01-T-D-V-P
PWB
SMA_PCB Johnson35 1 J1 142-0701-301 Right Angle SMA Connector_MT Components Inc.
Power 0.025" SMT SOCKET - BOTTOM36 1 J2 Samtec SSW-105-22-S-D-VSSupply SIDE OF PWB
0.025" SMT PLUG - TOP SIDE of37 1 Samtec TSM-105-01-T-D-V-P
PWB
38 2 SJP1 SJP2
TP1 TP2 TP3TP4 TP5 TP639 10 TP_.025 Keystone Electronics 5000K-ND TEST POINT PC MINI .040"D REDTP7 TP9 TP12TP15
TP8 TP10
TEST POINT PC MINI .040"D40 5 TP_.025 TP11 TP13 Keystone Electronics 5001K-ND
BLACKTP14
On the ADS7868EVM, item 29 is the ADS7868SDBVT device. On the ADS7867EVM, item 29 is theADS7867SDBVT device.
SLAU181 – July 2006 ADS7866EVM/ADS7867EVM/ADS7868EVM 7
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8 ADS786xEVM LAYOUT
ADS786xEVM LAYOUT
This chapter contains the layout drawings for revision B of the ADS7866EVM, ADS7867EVM, andADS7868EVM printed circuit board.
Figure 2. Top - Layer 1
Figure 3. Ground Plane - Layer 2
8ADS7866EVM/ADS7867EVM/ADS7868EVM SLAU181 – July 2006
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9 ADS786xEVM Schematic
ADS786xEVM Schematic
Figure 4. Power Plane - Layer 3
Figure 5. Bottom - Layer 4
SLAU181 – July 2006 ADS7866EVM/ADS7867EVM/ADS7868EVM 9
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A
B
C
D
D
C
B
Ati
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TITLE:
SHEET: OF:
FILE: SIZE:
REV:
Drawn By:
Engineer:
Revision History
REV ECN Number Approved
DOCUMENT CONTROL #:
12
BlockDiagram.sch
B
DATE: 30-Jun-2006
ADS7866/67/68/86/87/88EVM Block Diagram
6456887
Serial Control
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
P2
Analog Input
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
P1
+VA
-VA
CS
SCLK
+AVCC
+VA
-VA
+VDD
B_SDO
+IN
EXT_REF
Circuits
J1
+AVCC
Lijoy Philipose
Lijoy Philipose
1 2
3 4
5 6
7 8
910
J2
Power Supply
+VA -VA
+5VD
AGND
+AVCC
TP4
TP3
TP1
TP2
DGND
+3.3VD
CS
SCLK
FS
B_SDO
W1
W2
J m a U; in“ “ + 5 (inn: R2 ‘7 1 ‘ 04 Cm H H m. W5 7 7 m as , U4 "7 > mwm mu . \l + R25 R22 Cu! \. me ~ :- Rm 1 1 R m 05 m cu \‘ m m. H H \‘ rPs , m u €15“ (:17 m (:27 —— m w W <7 1m="" rpm="" m="" ,="" u="" t="" mm/zmlmun="" (:22="" m=""><9 m="" um="" nm="" mm="" m="" in="" tm="" u5="" ’—="" w="" m="" gm="" i="" *:cz§="" m="" “mm="" \m'm/u)="" mm="" \m'm/u)="" mm"="" \m'm/u)="" mummy="" \="" tph="" rh="" mm="" l.="" mummy="" \="">
1 2 3 4 5 6
A
B
C
D
6
54321
D
C
B
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TITLE:
SHEET: OF:
FILE: SIZE:
REV:
Drawn By:
Engineer:
Revision History
REV ECN Number Approved
DOCUMENT CONTROL #:
22
Circuits
B
DATE: 30-Jun-2006
Circuits
6456887
C17
2.2uF
C13
10nF
+5VCC
-VA
+VA
C5
1uF
C3
1uF
R24
300
R25
15
+IN
C19
NI
C18
1uF
R10
NI
R5
0
R23
NI
TP5
R20
300
C20
680pF
R14
1k
R9
0
C10
NI
+VA
C2
1uF
-VA
C4
1uF
R2
NI
Lijoy Philipose
Lijoy Philipose
C11
NI
1
2
3
R13
10k
3
2
6
74
5
1
U2
OPA735
31
2
SJP2
31
2
SJP1
*
*
*
3
2
6
74
5 1
8
U4
THS4031
C12
NI
*
R11
0
R22
NI
CS
SCLK
B_SDO
L1
MMZ2012R601A
TP9 +5VCC
C33
NI
C31
NI
TP10 TP7 +IOVDD
C32
NI
C30
NI
TP8
C23
10uF
C22
10uF
C36
1000pF
C37
1000pF
+AVCC
L3
MMZ2012R601A
L4
MMZ2012R601A
C6
NI
C7
NI
C34
NI
C35
NI
TP6
TP12
TP13
+VA
-VA
C24
10uF
C25
10uF
C38
1000pF
C39
1000pF
+VA
-VA
TP11
SDO
R8 100
R15
100
R7
0
C21
NI
+VCC C15
0.1uF
OE
1
A
2
GND
3Y4
VCC 5
U6
SN74LVC1G07
C14
NI
+5VCC
C8
0.47uF
VCC
1
GND
2
VIN
3SCLK 4
SDO 5
CS 6
U5
DUT
R21
NI
R3
NI
R4
NI
R6
0
R26
NI
C27
10uF
C26
10uF
C29
10uF
C28
10uF
ADS7866/ADS7867/ADS7868
ADS7883/ADS7884/ADS7885
ADS7886/ADS7887/ADS7888
C1
NI
+VCC
R28 0
W4
TP15
+VDD
TP14
R18
10k
+IOVDD
R19
10k
R16
140
+IOVDD
GND_F
1
GND_S
2
ENABLE
3IN 4
OUT_S 5
OUT_F 6
U3
REF3225
W3
C9
1uF
R1
NI
R12
0
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10 Related Documentation from Texas Instruments
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,please identify this booklet by its title and literature number. Updated documents can also be obtainedthrough our website at www.ti.com .
Data Sheets: Literature Number:
ADS7866/ADS7867/ADS7868 SLAS465
OPA227 SBOS110
REF1004C-2.5 SBVS002
SN74AHC1G125 SCLS377
THS4031 SLOS224
10 ADS7866EVM/ADS7867EVM/ADS7868EVM SLAU181 – July 2006
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It is important to operate this EVM within the input voltage range of 2.35 V to 5.25 V and theoutput voltage range of 0.4 V and VDD - 0.2 V.
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During normal operation, some circuit components may have case temperatures greater than30 °C. The EVM is designed to operate properly with certain components above 30 °C as long asthe input and output ranges are maintained. These components include but are not limited tolinear regulators, switching transistors, pass transistors, and current sense resistors. These typesof devices can be identified using the EVM schematic located in the EVM User's Guide. Whenplacing measurement probes near these devices during operation, please be aware that thesedevices may be very warm to the touch.
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