ETC DEM-ADS7804

DEM-ADS7804/05C
EVALUATION FIXTURE
FEATURES
DESCRIPTION
● 100kHz 12-BIT ADS7804P AND 16-BIT
ADS7805P INCLUDED
The DEM-ADS7804/05C Evaluation Fixture is a fully
assembled printed circuit board used to evaluate
ADS7804P and ADS7805P. This device incorporates
an analog input amplifier (with provisions to bypass
this amplifier), a parallel digital output buffer, a crystal oscillator based 100kHz convert command generator, an external convert command connector and a 2.3"
x 1.2" breadboard area. The DEM-ADS7804/05C
achieves full converter performance on a two-layer
board.
● 16-BIT BUFFERED PARALLEL OUTPUT
● CONNECTOR FOR ALL DIGITAL I/O PINS
● CRYSTAL OSCILLATOR BASED 100kHz
CONVERT COMMAND GENERATOR
● EXTERNAL CONVERT COMAND
CONNECTOR
● PROTOTYPE AREA
This fixture requires only a single +5V power supply.
An optional bipolar power supply connector is
provided for the input amplifier and breadboarding.
APPLICATIONS
● EVALUATE ADS7804P AND ADS7805P
PERFORMANCE
● BREADBOARD COMPLETE ANALOG
SYSTEM
● EVALUATE SIMPLE TWO-LAYER PCB
LAYOUT
● INCOMING INSPECTION TEST FIXTURE
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (602) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1993 Burr-Brown Corporation
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (602) 889-1510 • Immediate Product Info: (800) 548-6132
LI-448
Printed in U.S.A. November, 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
Other Options .................................................................................................................................... 7
Pin-Out for Output Connectors.................................................................................................................. 7
Wiring Diagram ......................................................................................................................................... 8
PCB Component Side .............................................................................................................................. 10
PCB Solder Side ...................................................................................................................................... 11
Installed Component List......................................................................................................................... 12
Packing List ............................................................................................................................................. 12
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, ADS7804P, ADS7805P,
or any other device on the DEM-ADS7804/05C, 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.
®
DEM-ADS7804/05
2
GND
FIGURE 1. PCB Legend.
FACTORY SETTINGS
With a +5V supply connected to P2, the DEM-ADS7804/
05C starts converting at 100kHz with an input range of
±10V. Data can be read in bytes or full parallel from P5.
MAKE SELECTION
FOR EACH STEP (1)
Buffered full parallel can be read from P6. The following is
a listing of “factory settings”.
OPTIONS (requires alteration of the demo board, all needed
components included).
FACTORY SETTINGS
1. Device
ADS7805P installed.
ADS7804P included for installation.
2. Input Amplifier
OPA671 bypassed.
Switching jumpers on J1 and J2 to “B” selects input amplifier. Apply ±15V to P1.
3. Offset Adjust
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.
5. Output Format
On-board 100kHz convert command
generator connected to R/C.
12/16-bit buffered full-parallel output (P6)
Apply external convert command generator (≤100kHz) to P4
and switch J3 to “EXT”.
Full parallel or 8-bit byte reading output (P5).
6. Power Supplies
2-pin power block (P2) ready for +5V.
3-pin power block (P1) ready for ±15V (for use with breadboard
and optional input amplifier).
4. Convert Command
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.
®
3
DEM-ADS7804/05
FACTORY SETTINGS (CONT)
Installed
Comments
P1
Yes
3-Pin Power Block
P2
Yes
2-Pin Power Block
P3
Yes
PCB Mount BNC Connector
P4
P5
Yes
Yes
PCB Mount BNC Connector
20 X 2 Header
P6
Yes
20 X 2 Shrouded Header
U1
Yes
28-Pin Socket for ADS7804P
or ADS7805P
U2
Yes
8-Pin Socket for OPA671
J1-J3
Yes
3 x 1 Headers
J4
No
Refer to Step-by-Step
Basic Operations,
Step 4B.
–V GND
+V
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
P1
P2
POWER
OPTIONAL
POWER
P4
P3
ANALOG
INPUT
P5
B
B
A
A
U2
J1
J2
DIGITAL I/O
GND
Hardware
U1
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
J3
INT
EXT
R/C
SELECT
J4
2
P6
40
1
PARALLEL OUTPUT
39
J4 Not included
FIGURE 2. Hardware Installed.
Jumpers for:
J1, J2
Setting
“A”
“INT”
P5
P5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
Crystal On-Board Convert Command Generator Selected (Outputs
100kHz to R/C)
B
B
Pin 37 to 38
CS Tied LOW
A
A
Pin 33 to 34
BYTE Tied LOW
P5
J1
J2
DIGITAL I/O
GND
J3
Comments
U2 (Input Amplifier Socket)
bypassed
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
J3
INT
J4
J4 Not included
FIGURE 3. Jumpers Installed.
®
DEM-ADS7804/05
4
EXT
R/C
SELECT
FACTORY SETTINGS (CONT)
ICs
Installed
Comments
ADS7804P
No
Included in Package
ADS7805P
Yes
Plugged into 28-Pin
OPA671
Yes
Plugged into 8-Pin Socket
(U2)
U3
Yes
4-Bit Decade Counter
U4
Yes
Hex Schmit Inverters
U5, U6
Yes
8-Bit Latch
U7
Yes
1.000MHz Crystal Oscillator
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
Socket (U1)
U2
U1
U3
U5
U6
U4
U7
FIGURE 4. ICs Installed.
Resistors
Installed
Comments
R2
No
576kΩ 1/4W 1%(1)
R3
No
33.2kΩ 1/4W 1%(1)
R5
No
49.9kΩ 1/4W 1%(1)
R1
Yes
33.2kΩ 1/4W 1%
R4
Yes
200Ω 1/4W 1%
R6-R8
Yes
4.99kΩ 1/4W 1%
R9
Pots
RV1, RV2
Yes
Installed
No
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
RV2
R8
R6
R7
R5
C5
GA
R1
R2
R3
R4
C2
OA
C1
RV1
49.9Ω 1/4W 1%
C3
C6
R9
C4
Comments
50kΩ 1/4W 1%(1)
Capacitors
Installed
Comments
C1, C2, C5,
C7-C11
Yes
0.1µF (50V)
C3, C4
Yes
2.2µF (25V)
C6
Yes
10µF (10V)
C7
NOTE: (1) Included in Package.
C8
C9
C10
U7
C11
FIGURE 5. Resistors and Capacitors Installed.
®
5
DEM-ADS7804/05
STEP-BY-STEP
BASIC OPERATIONS
Gain Adjust
STEP 1 — ADS7804P OR ADS7805P
A) To test the ADS7804P, install an ADS7804P in U1.
B) To test the ADS7805P, install an ADS7805P in 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.
Factory Setting: C3, C4, C5, C6 and 28-pin socket (U1)
soldered to the board. ADS7805P plugged into U1.
Factory Setting: ±10V input range without offset/gain trim,
R1 and R4 soldered to the board.
+V
B
C1
OA
RV1
A
U2
C6
C4
J2
OPTIONAL
POWER
U1
®
C6
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
DIGITAL I/O
GND
J1
P5
P3
R9
ANALOG
INPUT
R5
RV2
R8
R1
R2
R3
R4
C2
B
C1
A
J1
OA
RV1
A
U2
P2
POWER
PIN 1
GA
R6
R7
B
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
P4
C5
P4
C5
P5
J2
U1
®
U3
C7
U5
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
C6
C4
DIGITAL I/O
GND
R1
R2
R3
R4
C3
PIN 1
GA
C2
A
–V GND
P1
RV2
R8
R6
R7
B
P2
POWER
C4
P3
ANALOG
INPUT
R5
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
C5
C3
+V
OPTIONAL
POWER
C3
–V GND
P1
B) To adjust gain, install RV2 (50kΩ) and R2 (576kΩ), then
adjust RV2. Do this for +10V and –10V. See Figure 8.
R9
RV2
GA
U3
U6
INT
C7
U4
C8
C9
EXT
R/C
SELECT
C10
U5
U6
P6
J3
INT
U4
U7
2
R1
R2
R3
R4
OA
J3
40
C8
J4
C9
C10
RV1
EXT
R/C
SELECT
U7
C11
2
P6
40
1
PARALLEL OUTPUT
39
J4
1
39
PARALLEL OUTPUT
C11
U1
FIGURE 6. Factory Settings For Step 1.
FIGURE 8. Factory Settings for Step 3.
Step 2 — On-Board Input Amplifier
Step 4 — Convert Command Generator
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 R6,
R7, and R8 will affect the gain of the amplifier as follows:
A) J3 set to “INT” selects the on-board convert command
generator operating at 100kHz (divided down from 1MHz
by U3).
B) J3 set to “EXT” selects an external convert command
generator. Apply a negative-going pulse, 100ns in duration, to P4 (External Convert Command). This connector
is terminated on the board with a 50Ω resistor (R9).
Adjust the voltage of the generator for a 0V to 5V swing
and the pulse rate to the desired frequency (≤100kHz).
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.
GAIN = – (R8)/(R6 || R7)
NOTE: The on-board input amplifier may improve the
quality of the signal reaching the ADS7804P or ADS7805P.
This depends on the output characteristics of the signal
generator.
Factory Setting: J1 and J2 set to “A”, bypassing the
amplifier, R6, R7, R8, C1, C2 and 8-pin socket (U2) soldered to the board. OPA671 plugged into U2.
RV2
R8
B
R1
R2
R3
R4
C2
B
C1
A
OA
A
U2
RV1
J2
P5
C6
C4
U1
®
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
P1
R9
OPTIONAL
POWER
–V GND
C7
U5
U6
R6
R7
J3
INT
C10
EXT
R/C
SELECT
B
P6
40
1
PARALLEL OUTPUT
39
RV2
R8
B
R1
R2
R3
R4
C2
B
C1
A
U2
J1
OA
RV1
J2
P4
C5
P5
C6
C4
J4
A
C11
A
U2
U1
®
J1
P4
P2
POWER
PIN 1
GA
R6
R7
A
B
C1
U7
2
C2
ANALOG
INPUT
R5
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
OPTIONAL
POWER
P3
U4
C9
+V
P1
R8
U3
C8
+V
P4
C5
DIGITAL I/O
GND
J1
–V GND
POWER
PIN 1
GA
R6
R7
P2
C3
OPTIONAL
POWER
P3
ANALOG
INPUT
R5
Factory Setting: J3 set to “INT”, conversions synchronized
to on-board convert command generator at 100kHz. P4, R9,
U3, U7, C7 and C11 soldered to the board.
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
DIGITAL I/O
GND
+V
C3
–V GND
P1
J2
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
R9
EXTERNAL
R/C
R9
U3
FIGURE 7. Factory Settings for Step 2.
C7
U5
U6
J3
U3
INT
U4
C8
C9
C10
EXT
R/C
SELECT
U7
2
P6
40
1
PARALLEL OUTPUT
39
J4
Step 3 — Offset/Gain Adjust
C11
Offset Adjust
C7
U7
A) To adjust offset, install RV1 (50kΩ) and R3 (33.2kΩ),
ground the input, then adjust RV1. See Figure 8 for
location of RV1 and R3.
J4
C11
FIGURE 9. Factory Settings for Step 4.
®
DEM-ADS7804/05
6
Step 5 — Parallel or Byte-Reading Output
OPTIONAL
POWER
P3
ANALOG
INPUT
R5
RV2
R8
R1
R2
R3
R4
C2
B
C1
A
OA
POWER
P4
C5
P5
C4
DIGITAL I/O
GND
J2
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
C6
RV1
A
U2
J1
A) P5 outputs byte-reading and full parallel data — See
Figure 10.
P2
PIN 1
GA
R6
R7
B
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
U1
®
R9
B) P6 outputs buffered full parallel data—See Figure 11.
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. Be sure to tie pin 33 of P5 to pin 34 of P5
with a jumper. This puts the MSB on pin 1 of P6.
U3
C7
U5
U6
J3
INT
U4
EXT
C8
C9
R/C
SELECT
C10
U7
2
P6
40
1
PARALLEL OUTPUT
39
J4
C11
P5
P5
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
MSB (04P and 05P)
D8
LSB (05P)
D9
D10
D11
D12 LSB (04P)
D13
D14
D15
Pin 33 (P5) LOW
–V GND
+V
OPTIONAL
POWER
RV2
R8
B
R1
R2
R3
R4
C2
B
C1
A
U2
J1
OA
RV1
A
P2
POWER
PIN 1
GA
R6
R7
ANALOG
INPUT
R5
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
P1
P3
P4
C5
P5
C6
C4
J2
DIGITAL I/O
GND
BUSY
CS
R/C
BYTE
D0
LSB (05P)
D1
D2
D3
D4
LSB (04P)
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15 MSB (04P and 05P)
DIGITAL I/O
GND
DIGITAL I/O
GND
Factory Setting: Pin 33 jumpered to pin 34 (P5), P5, P6,
U4, U5, U6, C8, C9 and C10 soldered to the board (See
Figures 10, 11, and 12).
C3
+V
C3
–V GND
P1
U1
®
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
R9
U3
C7
U5
U6
J3
INT
U4
C8
C9
C10
EXT
R/C
SELECT
U7
2
P6
40
1
PARALLEL OUTPUT
39
J4
C11
U5
Pin 33 (P5) HIGH
U6
U4
FIGURE 10. Location of MSBs and LSBs on P5.
C8
C9
C10
FIGURE 12. Factory Settings for Step 5.
+V
OPTIONAL
POWER
P3
ANALOG
INPUT
R5
RV2
R8
R1
R2
R3
R4
C2
B
C1
A
A
U2
RV1
J2
POWER
P4
C5
P5
C4
U1
®
Step 6 — Power Supplies
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
C6
DIGITAL I/O
GND
J1
OA
P2
PIN 1
GA
R6
R7
B
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
C3
–V GND
P1
R9
A) A 5V power supply connected to P2 (Power) is all that is
required to operate the DEM-ADS7804/05C.
B) If the optional amplifier is used, P1 must be supplied with
power (OPA671 requires at least ±15V for this application).
U3
C7
U5
U6
J3
INT
U4
EXT
C8
C9
C10
R/C
SELECT
U7
2
P6
40
1
PARALLEL OUTPUT
39
J4
C11
Factory Setting: P1 and P2 ready to be connected to the
appropriate power supplies.
Pin 33 (P5) LOW
P6
40
–V GND
+V
OPTIONAL
POWER
1
PARALLEL OUTPUT
MSB (04P and 05P)
Pin 1
LSB (04P)
Pin 23
39
ANALOG
INPUT
R5
RV2
R8
R1
R2
R3
R4
C2
B
C1
A
U2
OA
RV1
J2
P4
C5
P5
C6
C4
DIGITAL I/O
GND
J1
Data Valid
Pin 33
GND +5
P2
POWER
PIN 1
GA
R6
R7
B
A
LSB (05P)
Pin 31
GND +5
BURR-BROWN CORP.
ADS7804/05
EVALUATION BOARD
P1
P3
C3
2
U1
®
P2
EXTERNAL
R/C
BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
R9
POWER
–V GND
+V
U3
FIGURE 11. Location of MSBs and LSBs on P6.
C7
U5
U6
P1
J3
INT
U4
C8
C9
C10
EXT
R/C
SELECT
U7
2
P6
40
1
PARALLEL OUTPUT
39
J4
C11
OPTIONAL
POWER
FIGURE 13. Factory Settings for Step 6.
®
7
DEM-ADS7804/05
FIGURE 14. DEM-ADS7804/05C Circuit Diagram.
®
DEM-ADS7804/05
8
Analog
Input
P3
B
J1
A
R7
4.99kΩ
R6
4.99kΩ
–V
GND
+V
GND
+5V
7
3
2
1
2
1
C7
0.1µF
+5V
P1
P2
+5V
–V
4
OPA671
RV1
50kΩ
3
2
U2
+V
R8
4.99kΩ
C8
0.1µF
+5V
–V
+V
+
+
C4
2.2µF
R4
200Ω
C11
0.1µF
+5V
C3
2.2µF
B
A
C10
0.1µF
+5V
R2
576kΩ
R3
33.2kΩ
C9
0.1µF
+5V
+5V
C1
+ 0.1µF
RV2
50kΩ
+5V
6
C2
+ 0.1µF
J2
10
D11
14
13
12
9
D12
D9
8
D13
11
7
D10
6
5
4
3
2
1
D14
D8
Out
8
DGND
D8
D9
D10
D11
D12
D13
D14
D15 (MSB)
AGND2
CAP
REF
+5V
BYTE
R/C
CS
BUSY
VANA
VDIG
9
10
1
15
11
4
5
4
D7
D6
D5
D4
D3
D2
D1
D0 (LSB)
U1
ADS7805
AGND1
VIN
GND
7
D15
R1
33.2kΩ
1.000MHz
U7
14
+V
+5V
U3
D6
D7
15
D5
D4
D3
D2
D1
D0
RCO
QD
16
17
18
19
20
21
22
23
24
25
26
27
28
D
QC
QB
B
C
QA
+
MAX/MIN
A
C5
0.1µF
LOAD
CTEN
D/U
CLK
74HCT190
13
7
6
2
3
12
+5V
C6
+ 10µF
7
5
3
1
D13
D14
D15
15
D8
9
17
D7
11
19
D6
D12
21
D5
D11
23
D4
D10
25
D3
13
27
D2
D9
29
D1
P5
34
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
36
38
33
37
35
40
1
R9
49.9Ω
2
U4
74HCT14
39
31
EXT
R/C
INT
D0
J3
3
P4
4
5
2
3
4
5
6
7
8
9
D9
D10
D11
D12
D13
D14
D15
11
1
9
8
7
6
5
4
3
2
11
1
6 13
D8
D7
D6
D5
D4
D3
D2
D1
D0
External
R/C
CLK
8D
7D
6D
5D
4D
3D
2D
1D
13
15
17
19
21
23
25
27
29
31
33
35
37
39
8Q
7Q
6Q
5Q
4Q
3Q
2Q
1Q
12
13
14
15
16
17
18
1
3
5
7
9
8
74HCT574
19
12
13
14
15
16
17
18
19
9
11
8Q
7Q
6Q
5Q
4Q
3Q
2Q
1Q
10
U5
OE
8D
7D
6D
5D
4D
3D
2D
1D
CLK
OE
74HCT574
U6
12 11
P6
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
NOTE: This circuit diagram includes the offset and gain circuitry. Refer to pages 3, 4 and 5 for factory settings.
Output
Parallel
PIN
ADS7804P
FUNCTION
ADS7805P
FUNCTION
ADS7804/05P
FUNCTIONS
PIN
ADS7804P
FUNCTION
ADS7805P
FUNCTION
1
D11(MSB)
D15(MSB)
3
D10
D14
2
GND
1
D11(MSB)
D15(MSB)
2
GND
4
GND
3
D10
D14
4
GND
5
D9
D13
7
D8
D12
6
GND
5
D9
D13
6
GND
8
GND
7
D8
D12
8
9
D7
GND
D11
10
GND
9
D7
D11
10
GND
11
13
D6
D10
12
GND
11
D6
D10
12
GND
D5
D9
14
GND
13
D5
D9
14
GND
15
D4
D8
16
GND
15
D4
D8
16
GND
17
D3
D7
18
GND
17
D3
D7
18
GND
19
D2
D6
20
GND
19
D2
D6
20
GND
21
D1
D5
22
GND
21
D1
D5
22
GND
23
D0 (LSB)
D4
24
GND
23
D0 (LSB)
D4
24
GND
25
Data Zero
D3
26
GND
25
Data Zero
D3
26
GND
27
Data Zero
D2
28
GND
27
Data Zero
D2
28
GND
29
Data Zero
D1
30
GND
29
Data Zero
D1
30
GND
31
Data Zero
D0 (LSB)
32
GND
31
Data Zero
D0 (LSB)
32
GND
33
BYTE
BYTE
34
GND
33
BYTE
BYTE
34
GND
35
R/C
R/C
36
GND
35
R/C
R/C
36
GND
37
CS
CS
38
GND
37
CS
CS
38
GND
39
BUSY
BUSY
40
GND
39
BUSY
BUSY
40
GND
PIN
TABLE II. Pinout of the Digital I/O Connector (P5). Pin 33
tied to pin 34 on P5 (BYTE is LOW).
PIN
ADS7804/05P
FUNCTIONS
TABLE III. Pinout of Buffered Output (P6). Pin 33 tied to pin
34 on P5 (BYTE is LOW).
FPO
FIGURE 15. PCB Component Side (Ground Plane).
®
9
DEM-ADS7804/05
–V GND +V
GND +5
AIN
R/C
FIGURE 16. PCB Solder Side
®
DEM-ADS7804/05
10
INSTALLED COMPONENT LIST
REFERENCE
QUANTITY
PART NUMBER
DESCRIPTION
MANUFACTURER(1)
Kemet
C1, C2, C5, C7-C11
8
SR205C104KAA
0.1µF 50V X 7R Ceramic Capacitor
C3, C4
3
TAP225K025SCS
2.2µF 25V Tantalum Capacitor
AVX
C6
1
TAP106K010SCS
10µF 16V Tantalum Capacitor
AVX
J1-J3
3
NSH-3SB-S1-T
3 X 1 Header
Robinson Nugent
P1
P2
1
1
ED500/3DS
ED500/2DS
3-pin Power Block
2-pin Power Block
On-Shore Technology
On-Shore Technology
P3, P4
2
KC-79-274-M06
PCB Mount BNC Connector
Kings
P5
1
NSH-40DB-S1-T
20 X 2 Header
Robinson Nugent
P6
1
IDH-40LP-S3-TG
20 X 2 Shrouded Header
Robinson Nugent
R1
1
5043EM33K20F
33.2kΩ 1/4W 1% MF Resistor
Philips
R4
1
5043EM200R0F
200Ω 1/4W 1% MF Resistor
Philips
R6-R8
3
5043EM499K0F
4.99kΩ 1/4W 1% MF Resistor
Philips
R9
1
5043EM49R90F
49.9Ω 1/4W 1% MF Resistor
Philips
U1
1
ADS7805P
16-Bit Sampling A/D Converter
Burr-Brown
U2
1
OPA671
Op Amp
Burr-Brown
U3
1
74HC190
4-Bit Decade Counter
T.I.
U4
1
74HC14
Hex Schmitt Inverters
T.I.
U5, U6
2
74HC574
8-Bit Latch
T.I.
U7
1
DOC-2-1.000MHz
1.000MHz Crystal Oscillator
Daiwa
4
MSB-2366-G-C-STP
0.1 Centerline Shunt
McKenzie
U1
1
DIP-328011B
28-Pin Socket (0.3")
McKenzie
U2
1
DIP-308011B
8-Pin Socket
McKenzie
QUANTITY
ITEM
DESCRIPTION
MANUFACTURER(1)
Demo Board
1
DEM-ADS7804/05C
Fully assembled printed circuit board with ADS7805P installed.
Burr-Brown
U1
1
ADS7804P
12-bit 10µs Sampling CMOS A/D Converter
Burr-Brown
RV1,RV2
2
RJ26FW503
50kΩ 1/4" trimmer resistors
Bourns
R2
1
5043EM576kOF
576kΩ 1/4W 1% MF resistor
Phillips
R3
1
5043EM33KOF
33.2kΩ 1/4W 1% MF resistor
Phillips
ADS7806P
1
PDS-1156A
ADS7804 Product Data Sheet
Burr-Brown
ADS7807P
1
PDS-1157A
ADS7805 Product Data Sheet
Burr-Brown
Demo Board Info.
1
LI-448
DEM-ADS7804/05C Manual
Burr-Brown
PACKING LIST
REFERENCE
NOTE: (1) For reference only. Equivalent components may be used.
®
11
DEM-ADS7804/05