DC1397B - Demo Manual

DEMO MANUAL DC1397B
LTC2656
16-Bit, Octal Rail-to-Rail DAC
with 10ppm/°C Max Reference
DESCRIPTION
Demonstration circuit 1397B features the LTC®2656 Octal
16-bit DAC with ±4LSB INL error. This device establishes
a new board-density benchmark for 16-bit DACs and
advances performance standards for output drive, crosstalk and load regulation in single supply, voltage-output
multiple DACs.
The DC1397B has many features for evaluating the performance of the LTC2656. An external 1.25V precision
reference is provided.
Another feature of this board is the onboard LTC2428
20-bit delta-sigma ADC for monitoring the DAC output
voltage. The 16ppm total error of this device is adequate
for taking meaningful measurements of various LTC2656
parameters.
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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TO
DC590
ANALOG
OUTPUT
Figure 1. DC1397B Connection Diagram
PERFORMANCE SUMMARY
PARAMETER
Resolution
Monotonicity
Differential Nonlinearity
Integral Nonlinearity
Load Regulation
DC Crosstalk
DEMO BOARD TYPE
DC1397B-A
DC1397B-B
Specifications are at TA = 25°C
CONDITION
VCC = 5V
VCC = 5V
VCC = 5V
VCC = 5V, Mid-Scale, IOUT = ±15mA
Due to Load Current Change on Any Other Channel
LTC2656 VARIATION
LTC2656BCUFD-L16
LTC2656BCUFD-H16
VALUE
16 Bits
16 Bits
±1LSB Maximum
±4LSB Maximum
2LSB/mA Maximum
3.5µV/mA
FULL SCALE
2.5V
4.096V
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DEMO MANUAL DC1397B
QUICK START PROCEDURE
Connect DC1397B to a DC590 USB serial controller using
the supplied 14-conductor ribbon cable. Connect DC590
to a host PC with a standard USB A/B cable. Run the
evaluation software supplied with DC590 or download it
from www.linear.com/software. The correct control panel
will be loaded automatically. Click the COLLECT button
to begin outputting codes to the DACs and reading back
the resulting output voltage for each DAC.
Complete software documentation is available from the
Help menu item, as features may be added periodically.
Figure 2. Demo Board Software
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DEMO MANUAL DC1397B
HARDWARE SETUP
Jumpers
Grounding and Power Connections
JP1 – VREF Select. Either a 1.25V/2.048V internal or 1.25V
onboard reference can be selected. To apply an external
reference through the VREF turret, set jumper to EXT.
Power (VCC) – Normally DC1397B is powered by the DC590
controller. VCC can be supplied to this turret, however
the power supply on DC590 must be disabled! Refer to
DC590 Quick Start Guide for more details on this mode
of operation.
JP2 – Power-Up Mode. The LTC2656 can be set to either
power up at Mid-Scale or Zero-Scale.
JP3 – ADC Disable. Set to ON for normal operation, with
the onboard ADC enabled. For very sensitive noise measurements, the ADC may be disabled. The software will
then display a positive full-scale reading.
Grounding – Signal ground is connected to the exposed
ground planes at the top and bottom edges of the board,
and to the two turrets labeled “Gnd.” Use signal ground
as the reference point for measurements and connections
to external circuits.
Analog Connections
DAC Outputs – The eight DAC outputs from the LTC2656
are brought out to turrets labeled DAC A through DAC H.
These may be connected to external instruments or other
circuitry. DAC outputs are not in alphabetical order on the
circuit board.
VREF – The VREF turret is connected directly to the REFIN/
OUT pin of the LTC2656.
When one of the onboard references is being used, the
reference voltage may be monitored at this point. An
external reference may also be applied to this turret after
setting JP1 to EXT.
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3
DEMO MANUAL DC1397B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
1
MANUFACTURER/PART NUMBER
0
C1 (Opt.)
CAP., 0402
2
5
C2, C5, C7, C9, C10
CAP., X7R, 0.1µF, 16V, 10% 0402
TAIYO YUDEN, EMK105BJ104KV
3
2
C3, C6
CAP., X7R, 1.0µF, 10V, 10% 0603
TAIYO YUDEN, LMK107BJ105KA
4
1
C4
RES., CHIP, 0, 0402
VISHAY, CRCW04020000Z0ED
5
1
C8
CAP., C0G, 100pF, 25V, 5% 0402
AVX, 04023A101JAT2A
6
0
C11 (Opt.)
CAP., 0603
7
14
E1-E14
TESTPOINT, TURRET, 0.061" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
8
1
JP1
2X4, 0.079 DOUBLE ROW HEADER
SAMTEC, TMM104-02-L-D
9
1
JP2
2X2, 0.079 DOUBLE ROW HEADER
SAMTEC, TMM102-02-L-D
10
1
JP3
3 PIN 0.079 SINGLE ROW HEADER
SAMTEC, TMM103-02-L-S
11
3
SHUNT
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
12
1
J1
CONNECTOR, DUAL 2X7 0.079CC
MOLEX, 87831-1420
13
4
R1, R2, R3, R4
RES., CHIP, 7.5k, 1/16W, 5% 0402
VISHAY, CRCW04027K50JNED
14
3
R5, R6, R7
RES., CHIP, 5.1k, 1/16W, 5% 0402
VISHAY, CRCW04025K10JNED
15
0
U2 (Opt.)
I.C., LT1790 SOT23-6
16
1
U3
I.C., LT1790ACS6-1.25 SOT23-6
LINEAR., LT1790ACS6-1.25#PBF
17
1
U4
I.C., LT1790ACS6-5 SOT23-6
LINEAR., LT1790ACS6-5#PbF
18
1
U5
I.C., LTC2428CG SSOP-28G
LINEAR., LTC2428CG#PBF
19
1
U6
I.C., Serial EEPROM TSSOP8
MICROCHIP, 24LC025-I/ST
U1
I.C., LTC2656BCUFD-L16, UFD-20
LINEAR TECH
U1
I.C., LTC2656BCUFD-H16, UFD-20
LINEAR TECH
Assembly Type-A
20
1
Assembly Type-B
20
1
REVISION HISTORY
REV
DATE
DESCRIPTION
B
10/13
Add REFCOMP Capacitor
PAGE NUMBER
Throughout
dc1397bf
4
E13
E12
GND
GND
NC
EEGND
EESCL
EESDA
EEVCC
MISO
MOSI/SDA
SCK/SCL
CS
5V
VUNREG
14
12
11
9
10
5
7
4
6
2
1
DC1397B-B
E11
C10
0.1uF
R6
5.1K
VCC
LTC2656BCUFD-H16
V+
LTC2656BCUFD-L16
DC1397B-A
V+
U1
ASSEMBLY TYPE
5
SDO
SCK
E10
VCC
SDA
8
7
3
2
1
7
6
R5
5.1K
SDI
SDO
SCK
U6
24LC025-I/ST
A2
A1
A0
WP
SCL
9
*
CS/LD
U1
C12
0.1uF
10
DAC-SDO
SDI
CS
LDAC
Zero Scale
Mid Scale
JP2
2
R7
5.1K
2
4
5
REFCOMP
VCC
1
3
VCC
17
VERSION TABLE
LDAC
J1
HDR2X7-079-MOLEX
GND
13
GND
8
GND
3
VCC
C8
100pF
CUSTOMER NOTICE
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
5
4
3
5
VOUT
2/21/08
2/21/08
DATE
6
C9
0.1uF
E14
FSset
VOUT
6
VCC
JP1
F0
SDO
DIN
CLK
SCK
TECHNOLOGY
26
24
21
19
25
20
23
FILENAME:
DWG NO
3
5
4
V+
E9
VREF
R4
7.5K
SHEET
DC1397B
1
R3
OF
7.5K
1
REV
1
C7
0.1uF
JP3
VCC
Enable Disable
3
1
DNC
DNC
VIN
C4
0
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
6
VOUT
C6
1.0uF
CS_MUX
1
3
5
7
U4
LT1790ACS6-5
INT 2
REF1 6
EXT 4
REF2 8
CS_ADC
C3
1.0uF
C11
1.0uF
opt.
LTC2656BCUFD
12/16-BIT, OCTAL DAC W/REFERENCE
SIZE CAGE CODE
TITLE
7.5K
R2
DNC
DNC
VIN
U3
LT1790ACS6-1.25
DNC
DNC
VIN
U2
LT1790(opt.)
Thursday, October 10, 2013 SCALE:
APPROVED
CONTRACT NO.
U5
LTC2428CG
17
15
14
13
12
11
E7
E8
VE
10
E5
VH
E6
VF
VG
16
E4
15
E3
E2
VB
VA
9
E1
VD
VC
14
13
4
3
1
20
C5
0.1uF
C2
0.1uF
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
APPROVALS
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO DRAWN
J. Wu
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
ENGINEER
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
L. Chen
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
CHECKED
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
VOUTH
VOUTG
VOUTF
VOUTE
VOUTD
VOUTC
VOUTB
VOUTA
R1
7.5K
C1
0.1uF
opt.
4
7
MUXOUT
6
REFIN/OUT
GND
21
CLR
GND
1
GND
2
GND
1
GND
2
4
ADCIN
12
PROSEL
REFLO
19
2
GND
2
11
VCC
GND
18
3
GND
28
ZSset
5
FSset
GND
27
8
VCC
GND
18
VCC
GND
22
GND
16
GND
6
GND
1
GND
1
*
8
VCC
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
2
V+
DEMO MANUAL DC1397B
SCHEMATIC DIAGRAM
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5
DEMO MANUAL DC1397B
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,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
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
dc1397bf
6
Linear Technology Corporation
LT 1013 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
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