Linear Technology DC1096-B LTC2642 16-Bit Unbuffered VOUT DAC DC1096B DC1096B 数据表

LTC2641/LTC2642

1

26412fc

For more information 

www.linear.com/LTC2641

16-/14-/12-Bit V

OUT

 DACs in 

3mm 

× 3mm DFN

The 

 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 mono-

tonic over temperature. The LTC2641A-16/LTC2642A-16 

provide 16-bit performance (±1LSB 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

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 ±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’s DAC output 

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

when power is initially applied. A logic low on the CLR pin 

asynchronously clears the DAC to zero scale (LTC2641) 

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

the commercial and industrial ranges.

n

  Tiny 3mm 

× 3mm 8-Pin DFN Package

n

  Maximum 16-Bit INL Error: ±1LSB over Temperature

n

  Low 120µA Supply Current

n

  Guaranteed Monotonic over Temperature

n

  Low 0.5nV•sec Glitch Impulse

n

  2.7V to 5.5V Single Supply Operation

n

  Fast 1µs Settling Time to 16 Bits

n

  Unbuffered Voltage Output Directly Drives 60k Loads

n

  50MHz SPI/QSPI/MICROWIRE

 

Compatible  

Serial Interface 

n

  Power-On Reset Clears DAC Output to Zero Scale 

(LTC2641) or Midscale (LTC2642)

n

  Schmitt-Trigger Inputs for Direct Optocoupler 

Interface

n

 Asynchronous CLR Pin

n

  8-Lead MSOP and 3mm 

× 3mm DFN Packages 

(LTC2641)

n

  10-Lead MSOP and 3mm 

× 3mm DFN Packages 

(LTC2642)

n

  High Resolution Offset and Gain Adjustment

n

  Process Control and Industrial Automation

n

  Automatic Test Equipment

n

  Data Aquisition Systems

–

+

16-BIT DATA LATCH

CONTROL

LOGIC

16-BIT DAC

1/2 LT1678

INV

R

FB

V

DD

V

REF

2V TO

 

V

DD

BIPOLAR V

OUT

–V

REF

 TO V

REF

0.1µF

5pF

REF

2.7V TO 5.5V

V

OUT

GND

26412 TA01a

16-BIT SHIFT REGISTER

1µF

0.1µF

LTC2642

POWER-ON

RESET

CS
SCLK
DIN
CLR

CODE

0

–1.0

INL (LSB)

–0.8

–0.4

–0.2

0

1.0

0.4

16384

32768

26412 TA01b

–0.6

0.6

0.8

0.2

49152

65535

V

DD

 = 5V

V

REF

 = 2.5V

±2.5V RANGE

INL 25°C

INL 90°C

INL –45°C

L

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

SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the  

property of their respective owners.