LTC2668

1

2668fa

For more information www.linear.com/LTC2668

Block Diagram

Features

Description

16-Channel 16-/12-Bit ±10V

10ppm/°C Max Reference

The LTC®2668 is a family of 16-channel, 16-/12-bit ±10V

digital-to-analog converters with integrated precision

references. They are guaranteed monotonic and have

built-in rail-to-rail output buffers. These SoftSpan™ DACs

offer five output ranges up to ±10V. The range of each

channel is independently programmable, or the part can

be hardware-configured for operation in a fixed range.

Theintegrated2.5Vreferenceisbufferedseparatelytoeach

channel; an external reference can be used for additional

range options. The LTC2668 also includes A/B toggle

capabilityviaadedicatedpinorsoftwaretogglecommand.

The SPI/Microwire-compatible 3-wire serial interface

operates on logic levels as low as 1.71V at clock rates

up to 50MHz.

Integral Nonlinearity (LTC2668-16)

applications

n

Precision Reference 10ppm/°C Max

n

Independently Programmable Output Ranges:

0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V

n

Full 16-Bit/12-Bit Resolution at All Ranges

n

Maximum INL Error: ±4LSB at 16 Bits

n

A/B Toggle via Software or Dedicated Pin

n

16:1 Analog Multiplexer

n

Guaranteed Monotonic Over Temperature

n

Internal or External Reference

n

Outputs Drive ±10mA Guaranteed

n

1.8V to 5V SPI Serial interface

n

6mm × 6mm 40-Lead QFN Package

n

Optical Networking

n

Instrumentation

n

Data Acquisition

n

Automatic Test Equipment

n

Process Control and Industrial Automation

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.

INTERNAL REFERENCE

CONTROL LOGIC

DECODE

TOGGLE SELECT REGISTER

MONITOR MUX

POWER-ON RESET

REFCOMP

OVRTMP

2668 TA01a

GND

14, 37

REFLO

13, 35

MUX

DAC 0

MUX

DAC 15

MUX

DAC 7

MUX

DAC 8

34

38

2

3

4

5

6

7

8

9

CS/LD

SCK

SDI

SDO

16

17

19

18

MUX 12

REF

AVP

10, 31

11, 32

33

36

28

27

30

29

26

25

CLR

LDAC

24

23

21

15

TGP

MSP0

MSP1

MSP2

20

39

40

1

OVP

22

32-BIT SHIFT REGISTER

CODE

±10V RANGE

0

–4

0

–1

–2

–3

1

2

3

4

16384

32768

49152

2668 TA01b

65535