MAX5441(2001) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX5441
(Rev.:2001)

+3V/+5V, Serial-Input, Voltage-Output, 16-Bit DACs

Maxim Integrated 

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

Voltage-Output, 16-Bit DACs

Unipolar Configuration

Figure 2a shows the MAX5441–MAX5444 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. The bipolar MAX5442/MAX5444 can also be

used in unipolar configuration by connecting RFB and

INV to REF. This allows the DAC to power-up to mid-

scale.

Bipolar Configuration

Figure 2b shows the MAX5442/MAX5444 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

lists the offset binary codes for this circuit.

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

DAC LATCH CONTENTS

MSB

LSB

ANALOG OUTPUT, VOUT

1111 1111 1111 1111

1000 0000 0000 0000

VREF ✕ (65,535 / 65,536)

VREF ✕ (32,768 / 65,536) = 1/2VREF

0000 0000 0000 0001 VREF ✕ (1 / 65,536)

0000 0000 0000 0000 0

Table 2. Bipolar Code Table

DAC LATCH CONTENTS

MSB

LSB

ANALOG OUTPUT, VOUT

1111 1111 1111 1111 +VREF ✕ (32,767 / 32,768)

1000 0000 0000 0001 +VREF ✕ (1 / 32,768)

1000 0000 0000 0000 0

0111 1111 1111 1111 -VREF ✕ (1 / 32,768)

0000 0000 0000 0000 -VREF ✕ (32,768 / 32,768) = -VREF

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