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DESCRIPTION

The LTC

廬

2641/LTC2642 are families of 16-, 14- and 12-bit

unbuffered voltage output DACs. These DACs operate from

a single 2.7V to 5.5V supply and are guaranteed monotonic

over temperature. The LTC2641-16/LTC2642-16 provide

16-bit performance (鹵2LSB INL and 鹵1LSB DNL) over

temperature. Unbuffered DAC outputs result in low supply

current of 120渭A and a low offset error of 鹵1LSB.

Both the LTC2641 and LTC2642 feature a reference input

range of 2V to V

DD

. V

OUT

swings from 0V to V

REF

. For

bipolar operation, the LTC2642 includes matched scaling

resistors for use with an external precision op amp (such

as the LT1678), generating a 鹵V

REF

output swing at R

FB

.

The LTC2641/LTC2642 use a simple SPI/MICROWIRE

compatible 3-wire serial interface which can be operated

at clock rates up to 50MHz and can interface directly

with optocouplers for applications requiring isolation. A

power-on reset circuit clears the LTC2641鈥檚 DAC output

to zero scale and the LTC2642鈥檚 DAC output to midscale

when power is initially applied. A logic low on the

鈳?/div>

C

鈳?/div>

L

鈳?/div>

R pin

asynchronously clears the DAC to zero scale (LTC2641)

or midscale (LTC2642). These DACs are all speci鏗乪d over

the commercial and industrial ranges.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Tiny 3mm

脳

3mm 8-Pin DFN Package

Maximum 16-Bit INL Error: 鹵2LSB over Temperature

Low 120渭A Supply Current

Guaranteed Monotonic over Temperature

Low 0.5nV鈥ec Glitch Impulse

2.7V to 5.5V Single Supply Operation

Fast 1渭s Settling Time to 16 Bits

Unbuffered Voltage Output Directly Drives 60k Loads

50MHz SPI

TM

/QSPI

TM

/MICROWIRE

TM

Compatible

Serial Interface

Power-On Reset Clears DAC Output to Zero Scale

(LTC2641) or Midscale (LTC2642)

Schmitt-Trigger Inputs for Direct Optocoupler

Interface

Asynchronous

鈳?/div>

C

鈳?/div>

L

鈳?/div>

R Pin

8-Lead MSOP and 3mm

脳

3mm DFN Packages

(LTC2641)

10-Lead MSOP and 3mm

脳

3mm DFN Packages

(LTC2642)

APPLICATIONS

鈻?/div>

High Resolution Offset and Gain Adjustment

Process Control and Industrial Automation

Automatic Test Equipment

Data Aquisition Systems

TYPICAL APPLICATION

Bipolar 16-Bit DAC

2.7V TO 5.5V

0.1渭F

LTC2642

V

DD

REF

1渭F

0.1渭F

R

FB

V

REF

2V TO V

DD

LTC2642-16 Integral Nonlinearity

1.0

0.8

0.6

V

DD

= 5V

V

REF

= 2.5V

鹵2.5V

RANGE

1/2 LT1678

POWER-ON

RESET

CS

SCLK

DIN

CLR

16-BIT DAC

16-BIT DATA LATCH

CONTROL

LOGIC

16-BIT SHIFT REGISTER

GND

26412 TA01a

+

V

OUT

INL (LSB)

鈥?/div>

BIPOLAR V

OUT

鈥揤

REF

TO V

REF

INV

5pF

0.4

0.2

0

鈥?.2

鈥?.4

鈥?.6

鈥?.8

鈥?.0

0

16384

32768

CODE

49152

65535

LT1372 鈥?G10

INL 25擄C

INL 90擄C

INL 鈥?5擄C

26412f

1

型號(hào)

版本

描述

廠商

下載
LTCZQ

英文版

16-/14-/12-Bit VOUT DACs in 3mm 】 3mm DFN

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