Analog Devices Linear Technology DC2692A Guide de configuration rapide

dc2692af

DEMO MANUAL DC2692A

DESCRIPTION

LTC2662

5-Channel, 16-/12-Bit, 300mA,

SoftSpan Current Source DACs

Demonstration circuit 2692A-A features the LT C

2662,

5-channel, 16-bit, 300mA, current source DACs with

10ppm/°C reference in a 5mm × 5mm QFN package.

Thisdevice features per-channel SoftSpan™configura-

tion of 3.125mA to 300mA, a separate supply for each

output, and an internal switch to allow any output pin to

be connected to V–.

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

and QuikEval and SoftSpan are trademarks of Analog Devices, Inc. All other trademarks are the

property of their respective owners.

Pin-compatible 12-bit versions are available for lower

resolution requirements on the DC2692A-B.

Design files and Bill of Materials for this circuit board

are available at http://www.linear.com/demo/DC2692A

Figure 1. Connection Diagram

dc2692af

DEMO MANUAL DC2692A

1. Download and install QuikEval™ from:

http://www.linear.com/quikeval

2. Connect a DC590 controller or DC2026 Linduino

with

the DC590 emulator firmware to the DC2692A with the

supplied ribbon cable.

3. Connect low noise analog power supplies as shown

in Figure 1. Refer to the data sheet for other supply

options.

4. Connect the controller to the host PC’s USB port and

run QuikEval. The DC2692A software will be down-

loaded and installed, after which the GUI will appear

ASSEMBLY TYPE PART NUMBER DAC CHANNELS BITS

MAX CURRENT PER

CHANNEL

DC2692A-A LTC2662-16 5 16 300mA

DC2692A-B LTC2662-12 5 12 300mA

as shown in Figure 2. The control panel gives access

to all of the LTC2662’s functionality including per-

channel SoftSpan ranges, toggling, power-down, etc.

Detailed instructions are provided in the Help menu.

Using External Reference for the DC2692

To use an external reference to drive the DC2692, move

the jumper named REF SEL (JP1) from the INT posi-

tion to the EXT position. Use the REF turret to drive the

reference voltage. If this is done after the DC2692 was

powered up, then the internal reference will need to be

disabled from the control register.

QUICK START PROCEDURE

ASSEMBLY OPTIONS

Figure 2. Main Control Panel

dc2692af

DEMO MANUAL DC2692A

Using External Precision Resistor to Adjust

Full‑ScaleOutput Current

The DC2692 has an unstuffed resistor (R4) that can be

used to set and adjust the full-scale output current. Move

the jumper named FS ADJ (JP2) from INT to EXT. It is

recommended to use a resistor with better than 2ppm/°C

temperature coefficient to take advantage of the LTC2662

low temperature coefficient. Values between 19k and 50k

can be used for the precision resistor.

Using External Supplies for VDDx

The DC2692 can be configured to connect different sup-

plies than V+. Move the jumper labeled VDDx from V+to

EXT and connect the low noise supply to the correspond-

ing VDDx turret.

Connectors and Turrets

J1:Interface connector to DC590 controller or Lin-

duinoprovides IOVCC power, SPI interface, and board

identification.

–

, GND, V

:Analog supplies, connected to the LTC2662

V+and V–pins. Nominally positive supply should be 7V

to 33V and negative supply should be 0V to –15V. Refer

to the data sheet for other supply configurations.

GND: Additional ground posts and exposed ground plane

around the board edge allow solid connection to prototype

circuitry and measurement equipment.

VCC:Analog supply voltage. Normally supplied by an

onboard LT3042 regulator set to 5V that is powered from

the V+supply. For single supply applications, VCC may be

tied directly to V+and supplied with 2.85V to 5.5V.

VDD0 to VDD4:Output supply voltage. A jumper is used to

connect the output supply to V

. Placing the jumper in the

EXT position allows the output supply voltage channel to

be connected externally to this point.

REF:Connection to the REF pin. In internal reference

mode, the reference voltage may be monitored at this

point. Placing REF SEL jumper in EXT position allows an

external low noise reference to be connected to this point.

Refer to the data sheet for compatible voltages.

MUX:Monitor Mux output. Allows surveying the DACout-

puts under software control. Must be measured with a high

impedance meter (output impedance is nominally10kΩ).

OUT0 – OUT4: DAC outputs.

CLR:Asynchronous clear input (pulled high to IOVCC with

a 5k resistor). Pull to the ground to reset the DAC to the

power-on reset value.

TGP:Toggle input (pulled high to IOVCC with a 5k resis-

tor). A high level on this pin enables software toggling.

See data sheet for a complete description of toggle

operation.

LDAC:Asynchronous DAC update. If CS/LD is high at the

falling edge of LDAC, DAC outputs will be updated with

the contents of the input registers. If CS/LD is low when

LDAC goes low, the DAC registers are updated after CS/

LD returns high.

FAULT:Fault detection pin (pulled high to IOVCC with a

5k resistor). The LTC2662 pulls this pin low if a fault is

detected. It is released on the next rising edge of CS/LD.

Jumpers

REF SEL (JP1): Selects internal or external reference

mode.

FS ADJ (JP2): Sets the full-scale current for the DACs.

Ensure FS ADJ is set to EXT position when using an exter-

nal precision resistor.

DD0

, V

DD1

, V

DD2

, V

DD3

, V

DD4

(J3, J4, J5, J6, J7): Select

the output supply voltages for the DACs to be either V+or

external via the turret.

LEDs

FAULT:Lights when FAULT pin asserts, indicating a fault

has occurred. (Note that LED will light if positive analog

supply is present and IOVCC is not. IOVCC is normally

supplied by the controller.)

Test Points

The SPI bus is available on a row of through-hole test

points next to J1 that may be used to monitor the bus or

drive the bus with an external controller.

EEGND, WP: For factory use only.

QUICK START PROCEDURE

dc2692af

DEMO MANUAL DC2692A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0817 • PRINTED IN USA

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

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