DC1546A - Demo Manual

DEMO MANUAL DC1546A
LTC2754-16
Quad 16-Bit SoftSpan
IOUT DAC
Description
Demonstration circuit 1546A features the LTC2754-16
dual 16-bit SoftSpan™ IOUT DAC. This device features
six output ranges: 0V to 5V, 0V to 10V, ±5V, ±10V, ±2.5V,
and –2.5V to 7.5V. The DAC has offset adjustment and
gain-adjustment pins to allow optimization of transient
response.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval and SoftSpan are a trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Board Photo
RIBBON CABLE
DAC
CONNECTIONS
TO DC590
CONTROLLER
dc1546a F01
ANALOG POWER SUPPLY
(NORMALLY ±15V)
Figure 1. DC1546A Connection Diagram
DC1546Af
1
DEMO MANUAL DC1546A
Quick Start Procedure
1. Connect a clean ±15V power supply to the AMPV+ and
AMPV– turret posts at the bottom of the DC1546A
board.
2. Connect J1 to a DC590 USB serial controller using
the supplied 14-conductor ribbon cable.
3. Connect the DC590 to a host PC with a standard USB
A/B cable.
The software automatically sets the LTC2754-16 outputs
according to the entries in the control panel. A square
wave option is available to test settling time. The MSPAN
jumper should be low if software span control is desired.
Additional software documentation may be available from
the Help menu item, as features may be added periodically.
4. Run the QuikEval™ evaluation software supplied with
the DC590 or download it from www.linear.com/
software. The correct control panel will be loaded
automatically.
Figure 2. QuikEval Software Screenshot
DC1546Af
2
DEMO MANUAL DC1546A
Hardware Setup
Jumpers
ANALOG CONNECTIONS
MSPAN: Manual Span Control Pin. MSPAN is used to
configure the LTC2754-16 for operation in a single, fixed
output range. If MSPAN is high it will be configured for
single span use. If MSPAN is low it will be set through the
QuikEval software. The default position is 0 (low).
OUTA, OUTB, OUTC, OUTD: DAC Voltage Outputs.
S0, S1, S2: Used to set the fixed output range if MSPAN
is high. Default is all jumpers removed, allowing software
span control.
VOSA, VOSB, VOSC, VOSD: DAC Offset Adjust Input. Use
only if the VOSA/VOSB/VOSC/VOSD jumper is set to EXT.
Nominal input range is ±5V.
S2
S1
S0
SPAN
0
0
0
Unipolar 0V to 5V
0
0
1
Unipolar 0V to 10V
0
1
0
Bipolar –5V to 5V
0
1
1
Bipolar –10V to 10V
1
0
0
Bipolar –2.5V to 2.5V
1
0
1
Bipolar –2.5V to 7.5V
Codes not shown are reserved and should not be used.
VREF: Voltage reference selection for the DAC, either 5V
for the onboard LT1236 reference or EXT if an external
reference source is connected to the VREF turret post.
VOSA, VOSB, VOSC,VOSD: Offset adjustment selection
for DACA, DACB, DACC, DACD. If no offset adjustment is
required, select GND. Selecting EXT connects the offset
pin to the turret allowing external adjustment of offset.
REFADJA, REFADJB, REFADJC, REFADJD: Gainadjustment selection for each associated DAC. If no gainadjustment is required, select GND. Selecting EXT
connects the gain pin to the turret allowing external
adjustment of gain.
VCC: Select source for 5V VCC supply. Set to 5V for supply by onboard LT1236 reference (recommended). Set to
REG to be supplied by regulated supply from the DC590
controller and remove the jumper to supply externally.
VREF: DAC Reference Voltage. If the onboard LT1236
references are selected, the voltage may be measured at
these points. If a remote reference is selected, then an
external reference must be applied to these points.
REFADJA, REFADJB, REFADJC, REFADJD: Gain-adjust
input for each associated DAC. This control input can be
used to null gain error or to compensate for reference errors.
Only used if the associated REFADJ jumper is set to EXT.
DIGITAL CONNECTIONS (TURRET POSTS)
CLR: Asynchronous Clear Pin. Pulled high through a 10k on
the board but can be driven low to clear all DAC registers.
RFLAG: Reset Flag Pin. Active low output.
LDAC: Asynchronous DAC Load Input. Pulled high through
a 10k on the board, but can be driven low to update all
DAC registers
GROUNDING AND POWER CONNECTIONS
Analog Power: The 15V, –15V and GND turret posts are
the analog supplies for the internal DAC amplifiers. These
should be connected to a well regulated, low noise power
supply.
VCC: Connection to VCC. See the schematic and description for the VCC jumper.
DC1546Af
3
DEMO MANUAL DC1546A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., X7R, 150pF, 50V, 10%, 0603
AVX, 06035C151KAT2A
DC1546A Required Circuit Components
1
4
C7, C14, C20, C21
2
4
C16, C17, C18, C19
CAP., COG, 27pF, 50V, 10%, 0603
AVX, 06035A270KAT2A
3
2
C15, C22
CAP., X7R, 0.1µF, 25V, 20%, 0603
TDK, C1608X7R1E104M
4
10
C1-C6, C8, C9-C13
CAP., X5R, 0.1µF, 50V, 20%, 0805
TDK, C2012X7R1H104M
TDK, C3216X5R1C106M
5
4
C1, C8, C23, C24
CAP., X5R, 10µF, 16V, 20%, 1206
6
0
C7, C14, C16-C21
OPT.
7
3
D1, D2, D4
DIODE, SCHOTTKY, SOT23
DIODES INC., BAT54C-7-F
8
1
D3
LED, SMT GREEN
PANASONIC, LN1351C-(TR)
9
27
E1-E27
TESTPOINT, TURRET, 0.064"
MILL-MAX, 2308-2
10
0
TP1-TP6
OPT.
11
9
JP1-JP7, JP10, JP13
JMP, 3-PIN, 1 ROW, 0.079"
SAMTEC, TMM-103-02-L-S
12
4
JP8, JP9, JP11, JP12
JMP, 2×3, 0.079"
SAMTEC, TMM-103-02-L-D
13
17
JP1-JP7, JP10, JP13,
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
(JP8, JP9, JP11, JP12 = 2 EA.)
14
1
J1
HEADER, 2×7PIN, 0.079"
MOLEX, 87831-1420 (PBF)
15
3
R4-R6
RES., CHIP, 4.99k, 1/16W, 1%, 0603
VISHAY, CRCW06034K99FKED
16
3
R1-R3
RES., CHIP ,10k, 1/16W, 5%, 0603
VISHAY, CRCW060310K0FKED
17
1
U1
I.C., LTC2754AIUKG-16, QFN52UKG
LINEAR TECHNOLOGY, LTC2754AIUKG-16
18
4
U2-U5
I.C., LT1469CS8, SO8
LINEAR TECHNOLOGY, LT1469CS8
19
1
U7
I.C., LT1236ACS8-5, SO8
LINEAR TECHNOLOGY, LT1236ACS8-5
MICROCHIP, 24LC025-I /ST
20
1
U6
I.C., SERIAL EEPROM, TSSOP8
21
4
FOR 4 CORNERS
STAND-OFF, NYLON (SNAP-ON), 0.625" TALL KEYSTONE, 8834
DC1546Af
4
D
C
B
A
1
NC
EEGND
EESCL
EESDA
EEVCC
MISO
SDA/MOSI
SCK/SCL
CS
5V
V+
E18
E16
E13
E10
E8
E6
E4
E3
E2
J1
HD2X7
REFADJD
REFADJC
REFADJB
REFADJA
LDAC
RFLAG
CLR
AMP V-
GND
14
12
11
9
10
5
7
4
6
2
1
V-
1
C22
0.1uF
TP1
CS
2
R4
4.99K
TP2
SCK
REFADJD
REFADJC
REFADJB
REFADJA
D2
BAT54C
3
2
2
D1
BAT54C
GND
R5
4.99K
TP3
SDI
3
TP5
WP
C3
0.1uF
50V
TP6
SDA
SCL
WP
VSS
A2
A1
A0
U6
24LC025
C10
0.1uF
50V
VCC
VSS
5
6
7
8
R6
4.99K
TP4
SDO
GND
JP4
REFADJD
1
EXT.
2
JP3
REFADJC
1
EXT.
2
3
GND
JP2
REFADJB
1
EXT.
2
3
GND
3
C9
0.1uF
50V
C2
0.1uF
50V
JP1
REFADJA
1
EXT.
2
C8
10uF
16V
C1
10uF
16V
4
3
2
1
C12
0.1uF
50V
3
C23
10uF
16V
R2
10K
2
33
34
35
32
36
VIN
8
7
6
5
31
30
6
S0
S1
S2
M-SPAN
LDAC
SRO
SCK
SDI
CS
RFLAG
CLR
C24
10uF
16V
6
4
2
C15
0.1uF
VCC
JP11
4
5
3
1
4
+
7
EXT.
5V
6
4
2
C14
150pF
JP12
3
2
5
3
1
V-
+
-
V+
Exposed Pad, Solder Side
U1
LTC2754AIUKG-16
U2B
LT1469CS8
5
6
EXT.
5V
1
E24
E26
REF3
REF4
1
2
3
JP13
EXT.
5V
E27
E23
REF1
VCC
E21
REF2
VCC
U5A
LT1469CS8
C20
150pF
3
2
V-
+
-
V+
5
5
+
-
VCC
REF4
REF3
REF1
REF2
5
6
1
7
U4B
LT1469CS8
150pF
C21
VOSADJD
IOUT2D
IOUT1D
VOSADJC
IOUT2C
IOUT1C
VOSADJB
IOUT2B
IOUT1B
VOSADJA
IOUT2A
IOUT1A
U3A
LT1469CS8
C7
150pF
Figure 3. LTC2754-16 Schematic Diagram
VOUT
U7
LT1236ACS8-5
D4
BAT54C
V+
REFADJD
REFADJC
REFADJB
REFADJA
S0
S1
S2
R3
10K
VCC
C13
0.1uF
50V
C6
0.1uF
50V
M-SPAN
1
C5
0.1uF
50V
D3
LED
GREEN
R1
10K
2
C11
0.1uF
50V
C4
0.1uF
50V
1
3
1
3
10
VDD
2
REFADJA
1
REFADJB
40
REFADJC
27
REFADJD
14
REF2
REF1
GND
4
GND
11
GND
9
GND
53
REF3
REF4
8
4
44
V+
8
4
RINC
28
GND
37
39
RINB
2
RINA
52
RCOMA
41
RCOMB
RCOMC
26
RIND
13
RCOMD
15
42
REFB
43
24
REFC
25
ROFSB
ROFSC
49
RFBA
50
ROFSA
51
RFBB
RFBC
23
REFA
REFD
16
ROFSD
17
RFBD
18
AMP V+
GND
GND
GND
3
8
13
2
3
20
12
19
21
29
22
46
38
45
47
3
48
S0
S2
REF4
0
1
6
4
2
VCC
0
1
6
4
2
VCC
REF3
REF2
JP8
VOSADJD
VOSADJC
VOSADJB
VOSADJA
REF1
6
S2
S1
6
JP9
S0
M-SPAN
+
-
+
-
C16
27pF
7
M-SPAN
S1
U4A
LT1469CS8
U5B
LT1469CS8
C18
27pF
U3B
LT1469CS8
7
3
2
3
2
V-
+
-
V+
V-
+
-
V+
1
JP7
VOSADJC
1
2
3
JP10
VOSADJD
1
2
3
GND
EXT.
GND
EXT.
JP6
VOSADJB
1
2
3
GND
EXT.
Linear Technology Has Made A Best Effort To Design A
Circuit That Meets Customer-Supplied Specifications;
However, It Remains The Customer's Responsibility To
Verify Proper And Reliable Operation In The Actual
Application. Component Substitution And Printed
Circuit Board Layout May Significantly Affect Circuit
Performance Or Reliability. Contact Linear Technology
Applications Engineering For Assistance.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
Customer Notice
7
E25
E22
E20
E19
VOSADJD
VOSADJC
VOSADJB
VOSADJA
GND
OUTD
GND
OUTC
GND
OUTB
GND
OUTA
Thursday, June 04, 2009
Date:
Sheet
8
1
of
1
Rev.
A
16-Bit Quad Serial Precision
SoftSpan Iout DAC
www.linear.com
Demo Circuit 1546A
Document Number
Size
LTC2754AIUKG-16,
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone (408) 432-1900
Fax (408) 434-0507
VOSADJD
VOSADJC
VOSADJB
VOSADJA
E17
E15
E14
E12
E11
E9
E7
E5
NOTES:
8
Linear Technology Corporation
Title
C19
27pF
JP5
VOSADJA
1
2
3
GND
EXT.
1
C17
27pF
7
U2A
LT1469CS8
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
5
3
1
VCC
5
3
1
VCC
5
6
5
6
8
4
8
4
E1
GND
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
4
1
D
C
B
A
DEMO MANUAL DC1546A
Schematic Diagram
DC1546Af
5
DEMO MANUAL DC1546A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
DC1546Af
6
Linear Technology Corporation
LT 0513 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
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