1

LTC2704

2704f

Quad 12-, 14- and 16-Bit

Voltage Output SoftSpan

DACs with Readback

Unipolar: 0V to 5V, 0V to 10V

Bipolar:

±5V, ±10V, ±2.5V, –2.5V to 7.5V

■

1LSB INL and DNL Over the Industrial

Temperature Range (LTC2704-14/LTC2704-12)

■

Glitch Impulse: < 2nV-sec

±5mA

■

Power-On and Clear to Zero Volts

■

Process Control and Industrial Automation

■

Automated Test Equipment

FEATURES

DESCRIPTIO

APPLICATIO S

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

SoftSpan is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

REFM1 REFG1 REF1

24

42

23

21

REFM2

REFG2

2704 BD

REF2

43

44

2

32

AGND

25

1,8,15,22,31,36

12

SRO

SDI

11

SCK

13

LDAC

9

CLR

14

CS/LD

10

RFLAG

35

34

GND

33

DAC C

DAC D

26

29

28

27

30

20

17

18

19

16

AGNDC

C1D

RFBD

OUTD

AGNDD

OUTC

RFBC

C1C

VOSC

VOSD

DAC A

AGNDA

OUTA

RFBA

C1A

VOSA

3

6

5

4

7

DAC B

C1B

RFBB

OUTB

AGNDB

VOSB

41

38

39

40

37

–1

–1

The LTC

put, 12-, 14- or 16-bit, voltage output SoftSpan™ DACs

that operate from 3V to 5V logic and

±5V to ±15V analog

supplies. SoftSpan offers six output spans—two unipolar

and four bipolar—fully programmable through the 3-wire

SPI serial interface. INL is accurate to 1LSB (2LSB for the

LTC2704-16). DNL is accurate to 1LSB for all versions.

Readback commands allow verification of any on-chip

register in just one 24- or 32- bit instruction cycle. All other

commands produce a “rolling readback” response from

the LTC2704, dramatically reducing the needed number of

instruction cycles.

A Sleep command allows any combination of DACs to be

powered down. There is also a reset flag and an offset

adjustment pin for each channel.

SI

PLIFIED BLOCK DIAGRA

LTC2704-16

Integral Nonlinearity (INL)

CODE

0

–1.0

–0.8

–0.4

–0.2

0

1.0

0.4

16384

32768

2704 TA01b

–0.6

0.6

0.8

0.2

49152

65535

±15V

±10V RANGE

ALL 4 DACS

SUPERIMPOSED