Rainbow-electronics MAX5123 Bedienungsanleitung PDF herunterladen (Seite 10)

MAX5122/MAX5123

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

with 10ppm/°C Internal Reference

10 ______________________________________________________________________________________

_______________Detailed Description

The MAX5122/MAX5123 12-bit, force/sense DACs are

easily configured with a 3-wire serial interface. They

include a 16-bit data-in/data-out shift register and have

a double-buffered digital input consisting of an input

employ precision bandgap references, as well as an

output amplifier with accessible feedback and output

pins that can be used to set the gain externally (Figure

1) or for forcing and sensing applications. These DACs

are designed with an inverted R-2R ladder network

(Figure 2) that produces a weighted voltage proportion-

al to the digital input code.

Internal Reference

Both devices use an on-board precision bandgap ref-

erence with a low temperature coefficient of only

10ppm/°C (max) to generate an output voltage of +2.5V

(MAX5122) or +1.25V (MAX5123). The REF pin can

source up to 100µA and may become unstable with

capacitive loads exceeding 100pF. REFADJ can be

used for minor adjustments to the reference voltage.

MAX5122

MAX5123

CONTROL

16-BIT

SHIFT REGISTER

DECODE

CONTROL

INPUT

BANDGAP

REFERENCE

BUFFER

DAC

(X1)

DOUT

UPO

OUT

1.25V

AGND DGNDV

DIN

SCLKCS

2.5V (1.25V)

LOGIC

OUTPUT

CLR

RSTVAL

PDL

REFADJ REF

( ) ARE FOR MAX5123 ONLY.

Figure 1. Simplified Functional Diagram

OUT

NOTE: SHOWN FOR ALL 1s ON DAC.

D0 D9 D10

D11

*INTERNAL REFERENCE: +2.5V (MAX5122),

+1.25V (MAX5123); OR EXTERNAL REFERENCE

2R 2R 2R 2R

RRR

REF*

AGND

Figure 2. Simplified Inverted R-2R DAC Structure

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

MAX5122/MAX5123 1

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