Rainbow-electronics MAX5123 Bedienungsanleitung PDF herunterladen (Seite 18)

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

18 ______________________________________________________________________________________

Using an External Reference

with AC Components

The MAX5122/MAX5123 have multiplying capabilities

within the reference input voltage range specifications.

Figure 13 shows a technique for applying a sinusoidal

input to REF, where the AC signal is offset before being

applied to the reference input.

Power-Supply and Bypassing

Considerations

On power-up, the input and DAC registers are cleared to

either zero (RSTVAL = DGND) or midscale (RSTVAL =

). Bypass the power supply (V

) with a 4.7µF

capacitor in parallel with a 0.1µF capacitor to AGND.

Minimize lead lengths to reduce lead inductance.

Layout Considerations

Digital and AC signals coupling to 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. Wire-wrapped boards and sockets are

not recommended. If noise becomes an issue, shield-

ing may be required.

TO OTHER

SERIAL DEVICES

MAX5122

MAX5123

DIN

SCLK

MAX5122

MAX5123

DIN

SCLK

MAX5122

MAX5123

DIN

I II III

SCLK

DIN

SCLK

CS1

CS2

CS3

Figure 12. Multiple Devices Share One Common Digital Input (DIN)

DAC

OUT

MAX5122

MAX5123

10k

26k

REF

DGNDAGND

+5V/

+3V

REFERENCE

INPUT

500mVp-p

MAX495

+5V/+3V

___________________Chip Information

TRANSISTOR COUNT: 3308

SUBSTRATE CONNECTED TO AGND

Figure 13. External Reference with AC Components

1 2 ... 13 14 15 16 17 18 19 20

MAX5122/MAX5123 1

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