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LTC1595CCS8

Serial 16-Bit Multiplying DACs

Linear Technology 

LTC1595/LTC1596/LTC1596-1

APPLICATIONS INFORMATION

Description

The LTC1595/LTC1596 are 16-bit multiplying DACs which

have serial inputs and current outputs. They use preci-

sion R/2R technology to provide exceptional linearity and

stability. The devices operate from a single 5V supply and

provide ±10V reference input and voltage output ranges

when used with an external op amp. These devices have

a proprietary deglitcher that reduces glitch impulse to

1nV-s over a 0V to 10V output range.

Serial I/O

The LTC1595/LTC1596 have SPI/MICROWIRE compatible

serial ports that accept 16-bit serial words. Data is accepted

MSB first and loaded with a load pin.

The 8-pin LTC1595 has a 3-wire interface. Data is shifted

into the SRI data input on the rising edge of the CLK pin.

At the end of the data transfer, data is loaded into the DAC

register by pulling the LD pin low (see LTC1595 Timing

Diagram).

VREF

–10V TO 10V 5V

The 16-pin LTC1596 can operate in identical fashion to

the LTC1595 but offers additional pins for flexibility. Four

clock pins are available STB1, STB2, STB3 and STB4. STB1,

STB2 and STB4 operate like the CLK pin of the LTC1595,

capturing data on their rising edges. STB3 captures data

on its falling edge (see Truth Table 1).

The LTC1596 has two load pins, LD1 and LD2. To load data,

both pins must be taken low. If one of the pins is grounded,

the other pin will operate identically to LTC1595’s LD pin.

An asynchronous clear input (CLR) resets the LTC1596 to

zero-scale (and the LTC1596-1 to mid-scale) when pulled

low (see Truth Table 2).

The LTC1596 also has a data output pin SRO that can be

connected to the SRI input of another DAC to daisy chain

multiple DACs on one 3-wire interface (see LTC1596

Timing Diagram).

Unipolar (2-Quadrant Multiplying) Mode

(VOUT = 0V to –VREF)

The LTC1595/LTC1596 can be used with a single op amp

to provide 2-quadrant multiplying operation as shown in

Figure 1. With a fixed –10V reference, the circuits shown

give a precision unipolar 0V to 10V output swing.

0.1µF

13 14 15 16

µP

10

4

7

STB3 CLR VDD

STB1

VREF

RFB

5 SRI

6

LD1

SRO

9

LTC1596

8

LD2

STB2

11 STB4

DGND

AGND

TO NEXT DAC

FOR DAISY-CHAINING

12

3

OUT1 1

OUT2

2

33pF

–

LT1001

+

1595/96 F01a

VOUT

0V TO –VREF

(a)

5V

VREF

–10V TO 10V

0.1µF 8

12

7 VDD VREF RFB

CLK

P 6 SRI LTC1595 OUT1 3

5 LD

GND

4

33pF

–

LT1001

+

1595/96 F01b

VOUT

0V TO –VREF

(b)

Table 1. Unipolar Binary Code Table

DIGITAL INPUT BINARY NUMBER

IN DAC REGISTER

MSB

LSB

1111 1111 1111 1111

1000 0000 0000 0000

0000 0000 0000 0001

0000 0000 0000 0000

ANALOG OUTPUT VOUT

–VREF (65,535/65,536)

–VREF (32,768/65,536) = –VREF/2

–VREF (1/65,536)

0V

Figure 1. Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to – VREF

159561fc

10

For more information www.linear.com/LTC1595

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