Low-Power, Dual, 12-Bit Voltage-Output DACs

with Configurable Outputs

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

© 1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Digitally Programmable Current Source

Figure 15 depicts a digitally programmable, unidirec-

tional current source that can be used in industrial con-

trol applications. The output current is:

where NB is the DAC code and R is the sense resistor.

Power-Supply Considerations

On power-up, the input and DAC registers clear (resets

a 4.7µF capacitor in parallel with a 0.1µF capacitor to

GND. Minimize lead lengths to reduce lead inductance.

Grounding and Layout Considerations

Digital and AC transient signals on AGND can create

noise at the output. Connect AGND to the highest quali-

ty ground available. Use proper grounding techniques,

such as a multilayer board with a low-inductance

ground plane. Carefully lay out the traces between

channels to reduce AC cross-coupling and crosstalk.

Wire-wrapped boards and sockets are not recommend-

ed. If noise becomes an issue, shielding may be

required.

MAX5156

MAX5157

DAC_

REF_

2N3904

R

AGND

FB_

OUT_

+5V/+3V

DGND

Figure 15. Digitally Programmable Current Source

___________________Chip Information

TRANSISTOR COUNT: 3053

SUBSTRATE CONNECTED TO AGND

__________________Pin Configuration

_Ordering Information (continued)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

AGND

OUTB

FBB

REFB

PDL

UPO

DOUT

DGND

TOP VIEW

MAX5156

MAX5157

DIP/QSOP

OUTA

FBA

CS

REFA

CL

DIN

SCLK

*

Contact factory for availability.

INL

(LSB)

PIN-PACKAGE

TEMP. RANGE

PART

±1

±1

±1/2

±1

±1/2

±2

±2

16 CERDIP*

-55°C to +125°C

MAX5156BMJE

16 QSOP

-40°C to +85°C

MAX5156BEEE

16 QSOP

-40°C to +85°C

MAX5156AEEE

16 Plastic DIP

-40°C to +85°C

MAX5156BEPE

16 Plastic DIP

-40°C to +85°C

MAX5156AEPE

±1

±2

±1

±2

±1

16 QSOP

0°C to +70°C

MAX5157BCEE

±2

16 Plastic DIP

0°C to +70°C

MAX5157BCPE

±1

16 QSOP

0°C to +70°C

MAX5157ACEE

16 CERDIP*

-55°C to +125°C

MAX5157BMJE

16 QSOP

-40°C to +85°C

MAX5157BEEE

16 QSOP

-40°C to +85°C

MAX5157AEEE

16 Plastic DIP

-40°C to +85°C

MAX5157BEPE

16 Plastic DIP

-40°C to +85°C

MAX5157AEPE

16 Plastic DIP

0°C to +70°C

MAX5157ACPE