MAX5141 datasheet(10/12 Pages) MAXIM

10 / 12 page

+3V/+5V, Serial-Input,

Voltage-Output, 14-Bit DACs

______________________________________________________________________________________

Unipolar Configuration

Figure 2a shows the MAX5141–MAX5144 configured for

unipolar operation with an external op amp. The op amp

is set for unity gain, and Table 1 lists the codes for this

circuit. Bipolar MAX5142/MAX5144 can also be used in

unipolar configuration by connecting RFB and INV to

REF. This allows the DAC to power up to midscale.

Bipolar Configuration

Figure 2b shows the MAX5141–MAX5144 configured

for bipolar operation with an external op amp. The op

amp is set for unity gain with an offset of -1/2VREF.

Table 2 shows the offset binary codes for this circuit

(less than 0.25 inches).

Power-Supply Bypassing and

Ground Management

Bypass VDD with a 0.1µF ceramic capacitor connected

between VDD and GND. Mount the capacitor with short

leads close to the device (less than 0.25 inches).

Table 1. Unipolar Code Table

Table 2. Bipolar Code Table

VREF ✕ (1 / 16,384)

0000 0000 0000 01

VREF ✕ (8192 / 16,384) = 1/2VREF

1000 0000 0000 00

VREF ✕ (16,383 / 16,384)

1111 1111 1111 11

ANALOG OUTPUT, VOUT

MSB

LSB

DAC LATCH CONTENTS

-VREF ✕ (8192 / 8192) = -VREF

0000 0000 0000 00

-VREF ✕ (1 / 8192)

0111 1111 1111 11

1000 0000 0000 00

+VREF ✕ (1 / 8192)

1000 0000 0000 01

+VREF ✕ (8191 / 8192)

1111 1111 1111 11

ANALOG OUTPUT, VOUT

MSB

LSB

DAC LATCH CONTENTS

Chip Information

TRANSISTOR COUNT: 2800

PROCESS: BiCMOS

Functional Diagrams

GND

VDD

OUT

CLR

DIN

SCLK

REF

MAX5141

MAX5143

14-BIT DAC

CONTROL

LOGIC

14-BIT DATA LATCH

SERIAL INPUT REGISTER

GND

VDD

OUT

CLR

DIN

SCLK

REF

14-BIT DAC

CONTROL

LOGIC

14-BIT DATA LATCH

SERIAL INPUT REGISTER

RFB

INV

MAX5142

MAX5144

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