Rainbow-electronics MAX5157 Manual do Utilizador descarregar pdf (Página 14)

MAX5156/MAX5157

Using an AC Reference

In applications where the reference has an AC signal

component, the MAX5156/MAX5157 have multiplying

capabilities within the reference input voltage range

specifications. Figure 12 shows a technique for apply-

ing a sinusoidal input REF_, where the AC signal is off-

set before being applied to the reference input.

Harmonic Distortion and Noise

The total harmonic distortion plus noise (THD+N) is typ-

ically less than -80dB at full scale with a 1Vp-p input

swing at 5kHz. The typical -3dB frequency is 600kHz

for both devices, as shown in the

Typical Operating

Characteristics

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

with Configurable Outputs

14 ______________________________________________________________________________________

MAX5156

MAX5157

DAC

OUT

(

+ R1

) (

)(

REF_

)

R2 4096

REF_

OUT

FB_

OUT_

AGNDDGND

+5V/+3V

Figure 10. Configurable Output Gain

AGNDDGND

MAX5156

MAX5157

DAC _

REF_

OUT_

FB_

10k 10k

V-

V+

OUT

+5V/+3V

Figure 11. Bipolar Output Circuit

DAC_

OUT_

FB_

MAX5156

MAX5157

10k

26k

REF_

DGND AGND

+5V/

+3V

REFERENCE

INPUT

500mVp-p

MAX495

+5V/+3V

Figure 12. AC Reference Input Circuit

Table 3. Bipolar Code Table

0000 0000 0001(0)

0000 0000 0000(0)

0111 1111 1111(0)

0V1000 0000 0000(0)

DAC CONTENTS

MSB LSB

1000 0000 0001(0)

1111 1111 1111(0)

ANALOG OUTPUT

2047

2048

REF













2048

REF













-V

2048

REF













-V

2047

2048

REF













-V

2048

2098

- V

REF REF













Note: ( ) are for the sub bit.

1 2 ... 9 10 11 12 13 14 15 16

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