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dc1012af

DEMO MANUAL DC1012A

DESCRIPTION

LTC2499/LTC2497/LTC2495

24-/16-Bit Easy Drive

8-/16- Channel Delta Sigma

ADC with I

C Interface

Demonstration circuit 1012A-A features the LTC

2499

8-/16-channel, 24-bit delta sigma ADC with Easy Drive™

inputs. Key DC specifications include 2ppm INL, 1ppm

offset, 25ppm full-scale error and 10nV/°C offset drift. In

the 6.8Hz/600nV

RMS

mode, input normal mode rejection

of 50Hz and 60Hz noise is better

than 87dB. The LTC2499

also includes an internal temperature sensor that is accurate

to 2°C over the operating temperature range.

DC1012A-B features the LTC2497 16-bit ∆Σ ADC that is

pinout and software compatible with the LTC2499.

DC1012A-C features the LTC2495 16-bit ∆Σ ADC that also

includes a PGA with a gain range from 1 to 256 and the

same temperature sensor as the

LTC2499.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Easy Drive, QuikEval and C-Load are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

DC1012A is a member of Linear Technology’s QuikEval™

family of demonstration boards. It is designed to allow

easy evaluation of the LTC2499, LTC2497 or LTC2495.

DC1012A may be connected directly to the target ap-

plication’s analog signals while using the DC590 USB

serial controller board and QuikEval software to measure

performance. The exposed ground planes allow proper

grounding to

prototype circuitry. After evaluating with

LT C ’s software, the digital signals can be connected to

the application’s processor/controller for development

of the serial interface.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. Proper Measurement Equipment Setup

Summary of content (6 pages)

PAGE 1
DEMO MANUAL DC1012A LTC2499/LTC2497/LTC2495 24-/16-Bit Easy Drive 8-/16- Channel Delta Sigma ADC with I2C Interface DESCRIPTION Demonstration circuit 1012A-A features the LTC®2499 8-/16-channel, 24-bit delta sigma ADC with Easy Drive™ inputs. Key DC specifications include 2ppm INL, 1ppm offset, 25ppm full-scale error and 10nV/°C offset drift. In the 6.8Hz/600nVRMS mode, input normal mode rejection of 50Hz and 60Hz noise is better than 87dB.
PAGE 2
DEMO MANUAL DC1012A QUICK START PROCEDURE Connect the DC1012A to a DC590 USB serial controller using the supplied 14-conductor ribbon cable. Connect the DC590 to host PC with a standard USB A/B cable. Run the evaluation software supplied with the DC590 or downloaded from www.linear.com/software. The correct program will be loaded automatically. Click the COLLECT button to start reading the input voltage.
PAGE 3
DEMO MANUAL DC1012A HARDWARE SETUP GND – Ground turrets are connected directly to the internal analog ground plane. PWR GND – Power ground, connected to the power return trace. VCC – This is the supply for the ADC. Do not draw any power from this point. External power may be applied to this point after disabling the VCC supply on DC590. See the DC590 quick start guide for details. REF+, REF– – These turrets are connected to the LTC2495/LTC2497/LTC2499 REF+ and REF– pins.
PAGE 4
DEMO MANUAL DC1012A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 4 C3, C7, C10, C13 CAP., CHIP X7R 0.01µF 16V AVX, 0603YC103KAT1A 0603 2 2 C11, C15 CAP., CHIP X7R 0.1µF 16V AVX, 0603YC104MAT1A 0603 3 1 C29 CAP., CHIP X5R 1µF 10V TAIYO YUDEN, LMK107BJ105KA 0603 4 3 C2, C9, C12 CAP., CHIP X5R 4.7µF 6.3V TAIYO YUDEN, JMK212BJ475MG 0805 5 1 C8 CAP., CHIP X5R 10µF 6.
PAGE 5
DEMO MANUAL DC1012A SCHEMATIC DIAGRAM dc1012af 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.
PAGE 6
DEMO MANUAL DC1012A 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.