LT1679 Linear Technology, LT1679 Datasheet

LT1679

Manufacturer Part Number

LT1679

Description

Dual/Quad Low Noise Rail-to-Rail Precision Op Amps

Manufacturer

Linear Technology

Datasheet

1.LT1679.pdf (20 pages)

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FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

Tiny 3mm × 3mm 8-Pin DFN Package

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

Low 120μA Supply Current

Guaranteed Monotonic over Temperature

Low 0.5nV•sec Glitch Impulse

2.7V to 5.5V Single Supply Operation

Fast 1μs Settling Time to 16 Bits

Unbuffered Voltage Output Directly Drives 60k Loads

50MHz SPI

Serial Interface

Power-On Reset Clears DAC Output to Zero Scale

(LTC2641) or Midscale (LTC2642)

Schmitt-Trigger Inputs for Direct Optocoupler

Interface

Asynchronous ⎯ C ⎯ L ⎯ R Pin

8-Lead MSOP and 3mm × 3mm DFN Packages

(LTC2641)

10-Lead MSOP and 3mm × 3mm DFN Packages

(LTC2642)

High Resolution Offset and Gain Adjustment

Process Control and Industrial Automation

Automatic Test Equipment

Data Aquisition Systems

2.7V TO 5.5V

SCLK

DIN

CLR

LTC2642

POWER-ON

CONTROL

RESET

LOGIC

/QSPI

16-BIT SHIFT REGISTER

/MICROWIRE

16-BIT DATA LATCH

0.1μF

16-BIT DAC

Bipolar 16-Bit DAC

REF

1μF

GND

Compatible

0.1μF

INV

OUT

26412 TA01a

2V TO V

REF

5pF

–

1/2 LT1678

16-/14-/12-Bit V

DESCRIPTION

The LTC

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

range of 2V to V

bipolar operation, the LTC2642 includes matched scaling

resistors for use with an external precision op amp (such

as the LT1678), generating a ±V

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 speciﬁ ed over

the commercial and industrial ranges.

All other trademarks are the property of their respective owners.

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

BIPOLAR V

–V

REF

TO V

OUT

REF

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

. V

LTC2641/LTC2642

3mm × 3mm DFN

–0.2

–0.4

–0.6

–1.0

–0.8

1.0

0.8

0.6

0.4

0.2

LTC2642-16 Integral Nonlinearity

OUT

±2.5V RANGE

REF

= 5V

swings from 0V to V

= 2.5V

16384

OUT

REF

www.DataSheet4U.com

32768

CODE

output swing at R

DACs in

49152

INL 25°C

INL 90°C

INL –45°C

LT1372 • G10

65535

REF

. For

26412f

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