DEM-ADS7810 [ETC]
DEM-ADS7810 - DISCONTINUED PRODUCT. No longer recommended for new design. ; DEM - ADS7810 - 停产的产品。不再建议用于新设计。\n
| 型号： | DEM-ADS7810 |
| 厂家： | 
ETC |
| 描述： | DEM-ADS7810 - DISCONTINUED PRODUCT. No longer recommended for new design.
|
| 文件： | 总11页 (文件大小：381K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
DEM-ADS7810/19C
EVALUATION FIXTURE
FEATURES
● 800kHz 12-BIT ADS7810P AND ADS7819P
DESCRIPTION
The DEM-ADS7810/19C Evaluation Fixture is a fully
assembled printed circuit board used to evaluate
ADS7810P and ADS7819P. This device incorporates
an analog input amplifier (with provisions to bypass
this amplifier), a parallel digital output buffer, a crys-
tal oscillator-based 800kHz convert command genera-
tor, external R/C and CS connectors, and a 2.3" x 1.2"
breadboard area. The DEM-ADS7810/19C achieves
full converter performance on a two-layer board.
INCLUDED
● 12-BIT BUFFERED PARALLEL OUTPUT
● CONNECTOR FOR ALL DIGITAL I/O PINS
● CRYSTAL OSCILLATOR BASED 800kHz
CONVERT COMMAND GENERATOR
● EXTERNAL R/C AND CS CONNECTORS
● PROTOTYPE AREA
This fixture requires only ±5V power supplies. An
optional bipolar power supply connector is
provided for the input amplifier and breadboarding.
APPLICATIONS
● EVALUATE ADS7810P AND ADS7819P
PERFORMANCE
● BREADBOARD COMPLETE ANALOG
SYSTEM
● EVALUATE SIMPLE TWO-LAYER PCB
LAYOUT
● INCOMING INSPECTION TEST FIXTURE
International Airport Industrial Park
•
Mailing Address: PO Box 11400
Cable: BBRCORP
•
Tucson, AZ 85734
•
Street Address: 6730 S. Tucson Blvd.
• Tucson, AZ 85706
Tel: (602) 746-1111 Twx: 910-952-1111
•
•
•
Telex: 066-6491
•
FAX: (602) 889-1510
•
Immediate Product Info: (800) 548-6132
© 1993 Burr-Brown Corporation
LI-454
Printed in U.S.A. December, 1993
TABLE OF CONTENTS
How to Use This Manual........................................................................................................................... 2
PCB Legend............................................................................................................................................... 3
Factory Settings ...................................................................................................................................... 3-5
Step-by-Step Basic Operations .................................................................................................................. 6
Device ................................................................................................................................................ 6
Input Amplifier .................................................................................................................................. 6
Offset/Gain Adjust............................................................................................................................. 6
Convert Command Generator............................................................................................................ 6
Output Format.................................................................................................................................... 7
Power Supplies .................................................................................................................................. 7
Wiring Diagram ......................................................................................................................................... 8
Pin-Out for Output Connectors.................................................................................................................. 9
PCB Component Side ................................................................................................................................ 9
PCB Solder Side ...................................................................................................................................... 10
Installed Component List......................................................................................................................... 11
Packing List ............................................................................................................................................. 11
HOW TO USE THIS MANUAL
A table and diagrams are included in the “Factory Settings”
section showing how the board is configured from the
factory. A listing of other components, which are shipped
with the board, is also included.
The Step-by-Step Basic Operations section describes all of
the options. At the end of each step, a figure illustrates
factory settings. Items installed are highlighted in those
figures.
For further details on the OPA671, ADS7810P, ADS7819P,
or any other device on the DEM-ADS7810/19C, refer to the
specific product data sheet.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
2
DEM-ADS7810/19
GND
FIGURE 1. PCB Legend.
FACTORY SETTINGS
With ±5V supplies connected to P2, the DEM-ADS7810/
19C starts converting at 800kHz with an input range of
±10V(ADS7810P) or ±2.5V (ADS7819P). Data can be read
in full parallel from P5. Buffered full parallel can be read
from P6. The following is a listing of “factory settings”.
MAKE SELECTION
OPTIONS (requires alteration of the demo board, all needed
components included).
FOR EACH STEP (1)
FACTORY SETTINGS
ADS7810P installed.
OPA671 bypassed.
1. Device
ADS7819P included for installation.
2. Input Amplifier
3. Offset Adjust
Switching jumpers on J1 and J2 to “B” selects input amplifier. Apply ±15V to P1.
Trim circuit not installed.
Trim circuit resistors and potentiometers included for
installation. See Step-by-Step Basic Operations, step 3.
Gain Adjust
Trim circuit not installed.
Trim circuit resistors and potentiometers included for
installation. See Step-by-Step Basic Operations, step 3.
4. Convert Command
On-board 800kHz convert command
generator connected to R/C. CS tied
LOW on P5 with a jumper.
A combination of R/C and CS can be used to control the conversions via P4
and P6. Refer to the product datasheets for timing diagrams and limits.
5. Output Format
6. Power Supplies
12-bit buffered full parallel output.
Full parallel output (P5).
3-pin power block (P2) ready for ±5V.
3-pin power block (P1) ready for ±15V (for use with breadboard
and optional input amplifier).
NOTE: (1) Each of these steps is explained in detail in the Step-by-Step Basic Operations section.
TABLE I. Quick Reference to Factory Settings and Other Options.
®
DEM-ADS7810/19
3
FACTORY SETTINGS (CONT)
Hardware
Installed
Yes
Comments
–V GND +V
+5 GND +5
POWER
P1
P2
P3
P4
P5
P6
P7
U1
3-Pin Power Block
BURR-BROWN CORP.
ADS7810/19
EVALUATION BOARD
P2
Yes
3-Pin Power Block
P1
OPTIONAL
POWER
Yes
PCB Mount BNC Connector
PCB Mount BNC Connector
20 X 2 Header
PIN 1
P4
P3
Yes
Yes
P5
ANALOG
INPUT
EXTERNAL
CS
+5
+5
GND
–5
–5
B
B
A
Yes
PCB Mount BNC Connector
20 X 2 Shrouded Header
A
U2
Yes
J1
J2
BUSY
CS
R/C
D0
Yes
28-Pin Socket for ADS7810P
or ADS7819P
D1
D2
D3
D4
D5
D6
D7
D8
U2
Yes
Yes
No
8-Pin Socket for OPA671
3 x 1 Headers
J1, J3, J5
J4
U1
Refer to Step-by-Step
Basic Operations,
Step 4B.
J3
D9
D10
D11
EXT
INT
R/C
SELECT
J5
EXTERNAL
R/C
FROM P5
EXT
CS
SELECT
P6
2
1
P6
40
39
PARALLEL OUTPUT
FIGURE 2. Hardware Installed.
Jumpers for:
Setting
Comments
BURR-BROWN CORP.
ADS7810/19
EVALUATION BOARD
J1, J2
“A”
U2 (Input Amplifier Socket)
bypassed
J3
“INT”
Crystal On-Board Con-
vert Command Genera-
tor Selected (Outputs
800kHz to R/C)
P5
+5
+5
GND
–5
–5
BUSY
CS
R/C
D0
D1
D2
D3
D4
D5
D6
D7
D8
B
A
B
A
J5
“From P5”
CS Controlled by Pin 27 of P5
CS Tied LOW
J1
J2
P5
Pin 27 to 28
J3
D9
D10
D11
EXT
INT
R/C
SELECT
J5
FROM P5
EXT
CS
SELECT
FIGURE 3. Jumpers Installed.
®
4
DEM-ADS7810/19
FACTORY SETTINGS (CONT)
ICs
Installed
No
Comments
BURR-BROWN CORP.
ADS7810/19
EVALUATION BOARD
ADS7819P
ADS7810P
Included in Package
Plugged into 28-Pin
Socket (U1)
Yes
OPA671
Yes
Plugged into 8-Pin Socket
(U2)
U3
Yes
Yes
Yes
Yes
4-Bit Decade Counter
Hex Schmitt Inverters
8-Bit Latch
U2
U4
U5, U6
U7
8.000MHz Crystal Oscillator
U1
U3
U5
U6
U4
U7
FIGURE 4. ICs Installed.
Resistors
R1
Installed
Comments
BURR-BROWN CORP.
ADS7810/19
EVALUATION BOARD
No
No
4.99kΩ 1/4W 1%(1)
221kΩ 1/4W 1%(1)
49.9 Ω 1/4W 1%(1)
49.9 Ω 1/4W 1%
1kΩ 1/4W 1%
R3
R4
No
–R7–
R2, R8, R9
R5, R6, R7
Yes
Yes
–R5–
–R2–
C2
(
(
)
)
–R6–
C1
–R8–
C10
C11
Pots
Installed
Comments
RV1, RV2
No
5kΩ 1/4" 1%(1)
Capacitors
Installed
Comments
C1, C2, C6,C8,
C10, C12-C16
Yes
0.1µF (50V ceramic)
C4, C5, C7, C9, C11
Yes
10µF (10V Tantalum)
C12
–R9–
NOTE: (1) Included in Package.
C13
C15
C16
C14
FIGURE 5. Resistors and Capacitors Installed.
®
DEM-ADS7810/19
5
Step 3 — Offset/Gain Adjust
Offset Adjust
STEP-BY-STEP
BASIC OPERATIONS
A) To adjust offset, install RV2 (5kΩ) and R1 (4.99kΩ),
ground the input, then adjust RV2. See Figure 8 for
location of RV2 and R1.
STEP 1 — ADS7810P OR ADS7819P
A) To test the ADS7810P, install an ADS7810P in U1.
B) To test the ADS7819P, install an ADS7819P in U1.
Gain Adjust
NOTE: The ADS7810P has an input range of ±10V. The
ADS7819P has an input range or ±2.5V. No alteration of the
board is necessary when switching from one to the other.
B) To adjust gain, install RV1 (5kΩ) and R3 (221kΩ), then
adjust RV1. Do this for +full scale and –full scale. See
Figure 8.
Factory Setting: C4-C11 and 28-pin socket soldered to the
board. ADS7810P plugged into U1.
NOTE: The offset directly affects the gain. Always trim
offset first. For maximum precision, more than one iteration
of these adjustments may be required.
–V GND +V
–5 GND +5
POWER
P5
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
Factory Setting: ±10V input range without offset/gain trim,
P1
P2
OPTIONAL
POWER
–R7–
PIN
1
RV2
P3
P4
oA
–R1–
–R2–
R2 soldered to the board.
–R5–
–R6–
C2
B
(
(
)
)
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
EXTERNAL
CS
(
(
)
)
–R3–
B
A
C1
GA
–R8–
A
U2
RV1
J1
J2
BUSY
CS
R/C
D0
C10
C11
D1
D2
D3
D4
D5
U1
D6
D7
®
D8
D9
C10
C11
D10
D11
–V GND +V
–5 GND +5
POWER
P5
J3
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
EXT
INT
P1
P2
U3
OPTIONAL
POWER
–R7–
R/C
SELECT
C12
PIN
1
U5
U6
RV2
J5
P3
P4
–R9–
FROM P5
EXT
oA
–R1–
–R2–
EXTERNAL
R/C
U4
–R5–
–R6–
C2
B
(
(
)
)
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
EXTERNAL
CS
(
(
)
)
CS
SELECT
–R3–
B
A
C1
C13
U7
C15
C16
GA
P6
–R8–
A
U2
RV1
J1
2
P7
40
J2
BUSY
CS
R/C
D0
J4
C14
RV2
RV1
C10
C11
1
39
D1
PARALLEL OUTPUT
D2
D3
D4
OA
GA
D5
U1
U1
D6
R1
R2
D7
®
D8
D9
D10
D11
J3
EXT
INT
U3
FIGURE 6. Factory Settings For Step 1.
R/C
SELECT
C12
U5
U6
J5
R3
–R9–
FROM P5
EXT
EXTERNAL
R/C
U4
CS
SELECT
C13
U7
C15
C16
P6
2
P7
40
Step 2 — On-Board Input Amplifier
J4
C14
1
39
PARALLEL OUTPUT
To use the on-board input amplifier, jumpers J1 and J2 must
be set to the “B” position, and P1 (Optional Power) must be
supplied with ±15V. The factory setting of the amplifier
yields an inverting gain of 2. Combinations of resistors R5,
R6, and R7 will affect the gain of the amplifier as follows:
FIGURE 8. Factory Settings for Step 3.
Step 4 — Convert Command Generator
GAIN = – (R7)/(R5 || R6)
A) J3 set to “INT” selects the on-board convert command
generator operating at 800kHz (divided down from 8MHz
by U3).
NOTE: The on-board input amplifier may improve the
quality of the signal reaching the ADS7810P or ADS7819P.
This depends on the output characteristics of the signal
generator.
B) J3 set to “EXT” selects an external convert command
generator. Apply a negative-going pulse, 100ns in dura-
tion, to P6 (External Convert Command). This connector
is terminated on the board with a 50Ω resistor (R8).
Adjust the voltage of the generator for a 0V to 5V swing
and the pulse rate to the desired frequency (≤800kHz).
NOTE: When using an external convert command, the
trace powering the on-board convert command generator
can be cut to eliminate any noise contributions due to the
oscillator. To reconnect, install a jumper at J4.
Factory Setting: J1 and J2 set to “A”, bypassing the
amplifier, R5, R6, R7, C1, C2 and 8-pin socket (U2) sol-
dered to the board. OPA671 plugged into U2.
–V GND +V
–5 GND +5
POWER
P5
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
P1
P2
–V GND +V
OPTIONAL
POWER
–R7–
PIN
1
RV2
P3
P4
oA
–R1–
–R2–
–R5–
–R6–
C2
B
(
(
)
)
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
EXTERNAL
CS
(
(
)
)
–R3–
B
A
P1
C1
GA
–R8–
A
U2
RV1
J1
J2
BUSY
CS
R/C
D0
C10
C11
OPTIONAL
POWER
D1
D2
D3
D4
C) J3 and J5 set to “EXT” allows the user to control the
“read” and “convert” commands via P4 (CS) and P6
(R/C). Refer to the product data sheets for timing
diagrams and limits.
D5
U1
D6
D7
D8
®
D9
R7
D10
D11
J3
EXT
INT
U3
R5
R6
R/C
SELECT
C2
B
C12
U5
U6
J5
–R9–
EXTERNAL
R/C
FROM P5
EXT
U4
CS
SELECT
B
A
C13
U7
C15
C16
P6
C1
2
P7
40
J4
C14
A
Factory Setting: J5 set to “From P5”, J3 set to “INT”,
conversions synchronized to on-board convert command
generator at 800kHz. P4, P6, R8, R9, U3, U7, C12 and C14
soldered to the board.
U2
1
39
PARALLEL OUTPUT
J1
J2
FIGURE 7. Factory Settings for Step 2.
®
6
DEM-ADS7810/19
–V GND +V
–5 GND +5
POWER
P5
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
P4
P1
P2
OPTIONAL
POWER
–R7–
PIN
1
RV2
P3
P4
oA
–R1–
–R2–
–R5–
–R6–
C2
B
(
(
)
)
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
EXTERNAL
CS
(
(
)
)
–R3–
B
A
C1
EXTERNAL
GA
–R8–
A
U2
RV1
J1
J2
CS
R8
BUSY
CS
R/C
D0
C10
C11
D1
D2
D3
D4
D5
U1
D6
D7
®
D8
D9
D10
D11
J3
EXT
INT
U3
R/C
SELECT
C12
U5
U6
J5
U3
–R9–
EXTERNAL
R/C
FROM P5
EXT
U4
EXT
INT
CS
C13
U7
C15
C16
SELECT
P6
2
P7
40
J4
C14
C12
1
39
PARALLEL OUTPUT
R/C
SELECT
J5
FROM P5
EXT
U7
R9
J4
EXTERNAL
R/C
CS
SELECT
C14
P6
FIGURE 9. Factory Settings for Step 4.
Step 6 — Power Supplies
Step 5 — Parallel Output
A)±5V power supplies connected to P2 (Power) is all that is
A)P5 outputs full parallel data — See Figure 10.
required to operate the DEM-ADS7810/19C.
B) P6 outputs buffered full parallel data—See Figure 10.
B) If the optional amplifier is used, P1 must be supplied with
power (OPA671 requires at least ±15V for this applica-
tion).
A rising edge pulse will be output on pin 33 (Data Valid)
of P6 signifying the end of a conversion and that data is
valid. Data will be from the most recently completed
conversion.
Factory Setting: P1 and P2 ready to be connected to the
appropriate power supplies.
Factory Setting: P5, P6, U4, U5, U6, C13, C15 and C16
soldered to the board. Buffered full parallel output on P6.
–V GND +V
+5 GND +5
POWER
P5
–V GND +V
–5 GND +5
POWER
P5
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
P1
P2
+5
+5
GND
–5
–5
BUSY
CS
R/C
D0 (LSB)
D1
P2
P1
OPTIONAL
POWER
–R7–
PIN
1
RV2
P3
P4
oA
–R1–
–R2–
–R5–
–R6–
C2
B
(
(
)
)
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
OPTIONAL
POWER
EXTERNAL
CS
(
(
)
)
–R3–
B
A
C1
GA
–R8–
A
U2
RV1
J1
J2
BUSY
CS
R/C
D0
C10
C11
–V GND +V
–5 GND +5
POWER
P5
BURR-BROWN COR.
ADS7810/19
EVALUATION BOARD
P1
P2
D1
D2
OPTIONAL
POWER
–R7–
D3
PIN
1
RV2
P3
P4
D4
oA
–R1–
–R2–
D5
U1
–R5–
–R6–
C2
B
(
(
)
)
D6
ANALOG
INPUT
A4
+5
+5
GND
–5
–5
EXTERNAL
CS
(
(
)
)
D7
–R3–
B
A
®
C1
D8
GA
–R8–
D9
A
U2
RV1
D10
D11
J1
J2
J3
BUSY
CS
R/C
D0
C10
C11
EXT
INT
U3
D1
R/C
SELECT
D2
C12
D3
U5
U6
J5
D4
D2
D3
D4
D5
–R9–
EXTERNAL
R/C
FROM P5
EXT
D5
U1
D6
U4
D7
®
D8
CS
SELECT
D9
C13
U7
C15
C16
D10
D11
P6
J3
EXT
INT
2
P7
40
U3
J4
C14
R/C
SELECT
C12
U5
U6
J5
–R9–
EXTERNAL
R/C
FROM P5
EXT
1
39
U4
D6
PARALLEL OUTPUT
CS
SELECT
C13
U7
C15
C16
D7
D8
D9
P6
2
P7
40
J4
C14
1
39
PARALLEL OUTPUT
D10
D11 (MSB)
FIGURE 11. Factory Settings for Step 6.
U5
U6
U4
C13
C15
P6
C16
40
2
1
39
PARALLEL OUTPUT
MSB
LSB
DATA VALID
FIGURE 10. Factory Settings for Step 5.
®
DEM-ADS7810/19
7
FIGURE 12. DEM-ADS7810/19C Circuit Diagram.
®
8
DEM-ADS7810/19
ADS7810/19P
FUNCTION
D11(MSB)
D10
ADS7810/19P
FUNCTION
GND
ADS7810/19P
ADS7810/19P
FUNCTION
GND
PIN
1
PIN
2
PIN
1
FUNCTION
PIN
2
B1(MSB)
3
GND
4
3
B2
GND
4
5
D9
GND
6
5
B3
GND
6
7
D8
GND
8
7
B4
B5
GND
8
9
D7
GND
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
9
GND
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
D6
GND
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
B6
GND
D5
GND
B7
GND
D4
GND
B8
GND
D3
GND
B9
GND
D2
GND
B10
GND
D1
GND
B11
GND
D0 (LSB)
R/C
GND
B12
GND
GND
DATA LOW
DATA LOW
DATA LOW
DATA LOW
DATA VALID
GND
CS
GND
GND
BUSY
–5V
GND
GND
GND
GND
–5V
GND
GND
GND
+5V
GND
GND
GND
GND
+5V
GND
GND
GND
TABLE II. Pinout of the Digital I/O Connector (P5).
TABLE III. Pinout of Buffered Output (P6).
FIGURE 13. PCB Component Side (Ground Plane).
®
DEM-ADS7810/19
9
FIGURE 14. PCB Solder Side
®
10
DEM-ADS7810/19
INSTALLED COMPONENT LIST
REFERENCE
QUANTITY
PART NUMBER
DESCRIPTION
MANUFACTURER(1)
C1, C2, C6, C8-C10
C12-C16
10
6
SR205C104KAA
TAP106K010SCS
NSH-3SB-S1-T
0.1µF Ceramic Capacitor
10µF 10V Tantalum Capacitor
3 X 1 Header
AVX
AVX
C3-5, 7, 9,11
J1-J3, J5
4
Robinson Nugent
P7
P1, P2
1
2
IDH-40LP-S3-TG
ED500/3DS
20 x 2 Shrouded Header
3-pin Power Block
Robinson Nugent
On-Shore Technology
P3, P4, P6
P5
3
1
3
3
1
1
1
1
2
1
5
1
1
KC-79-274-M06
NSH-40DB-S1-T
5043ED49R90F
5193ED1K000F
ADS7810P
PCB Mount BNC Connector
20 X 2 Header
Kings
Robinson Nugent
Philips
R2, R8, R9
R5, R6, R7
U1
49.9Ω 1/4W 1% MF Resistor
1kΩ 1/4W 1% MF Resistor
12-Bit Sampling A/D Converter
Op Amp
Philips
Burr-Brown
Burr-Brown
T.I.
U2
OPA671
U3
74HC190
4-Bit Decade Counter DIP
Hex Schmitt Inverters DIP
8-Bit Latch DIP
U4
74HC14
T.I.
U5, U6
U7
74HC574
T.I.
F1100E
8.000MHz Crystal Oscillator
0.1 Centerline Shunt
28-Pin Socket (0.3")
8-Pin Socket
Fox
MSB-2366-G-C-STP
DIP-328011B
DIP-308011B
McKenzie
McKenzie
McKenzie
U1
U2
PACKING LIST
REFERENCE
QUANTITY
ITEM
DESCRIPTION
MANUFACTURER(1)
Demo Board
U1
1
1
2
1
1
1
1
1
DEM-ADS7810/19C
ADS7819P
Fully assembled printed circuit board with ADS7810P installed.
12-bit Sampling A/D Converter
5kΩ 1/4" trimmer resistors
Burr-Brown
Burr-Brown
Bourns
RV1,RV2
R1
RJ26FW502
5043ED4k990F
5043ED4221KF
PDS-1138A
4.99kΩ 1/4W 1% MF resistor
Phillips
R3
221kΩ 1/4W 1% MF resistor
Phillips
ADS7810P
ADS7819P
Demo Board Info.
ADS7810 Product Data Sheet
Burr-Brown
Burr-Brown
Burr-Brown
PDS-1193A
ADS7819 Product Data Sheet
LI-454
DEM-ADS7810/19C Manual
NOTE: (1) For reference only. Equivalent components may be used.
®
DEM-ADS7810/19
11
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