LTC2641/LTC2642

1

26412f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

3mm

× 3mm DFN

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 (±2LSB INL and ±1LSB DNL) over

temperature. Unbuffered DAC outputs result in low supply

current of 120μA and a low offset error of ±1LSB.

Both the LTC2641 and LTC2642 feature a reference input

bipolar operation, the LTC2642 includes matched scaling

resistors for use with an external precision op amp (such

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’s DAC output

to zero scale and the LTC2642’s DAC output to midscale

when power is initially applied. A logic low on the

⎯C⎯L⎯R pin

asynchronously clears the DAC to zero scale (LTC2641)

or midscale (LTC2642). These DACs are all specified over

the commercial and industrial ranges.

× 3mm 8-Pin DFN Package

Serial Interface

(LTC2641) or Midscale (LTC2642)

Interface

⎯C⎯L⎯R Pin

× 3mm DFN Packages

(LTC2641)

× 3mm DFN Packages

(LTC2642)

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

All other trademarks are the property of their respective owners.

Bipolar 16-Bit DAC

16-BIT DATA LATCH

CONTROL

LOGIC

16-BIT DAC

1/2 LT1678

INV

0.1

μF

5pF

REF

2.7V TO 5.5V

GND

26412 TA01a

16-BIT SHIFT REGISTER

1

μF

0.1

μF

LTC2642

POWER-ON

RESET

CS

SCLK

DIN

CLR

CODE

0

–1.0

–0.8

–0.4

–0.2

0

1.0

0.4

16384

32768

LT1372 • G10

–0.6

0.6

0.8

0.2

49152

65535

±2.5V RANGE

INL 25

°C

INL 90

°C

INL –45

°C

LTC2642-16 Integral Nonlinearity