Rainbow-electronics MAX1329 Bedienungsanleitung PDF herunterladen (Seite 69)

MAX1329/MAX1330

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,

Reference, Voltage Monitors, and Temp Sensor

______________________________________________________________________________________ 69

AIN1

AGND

2N3904

MUX

REFADC

PGA

AIN1

AIN2

OUT1

OUTB/OUT2

FBB/IN2-

IN1-

REFADC

REFDAC

OUTA/OUT3

FBA/IN3-

ADC FIFO

DITHER

ACCUMULATOR

12-BIT ADC

= 1, 2, 4, 8

ALARM

MUX

REFADJ

REFADC

2.5V

REF

= 0.5, 0.82, 1

AIN2

AGND

2N3904

REFDAC

TEMP

SENSOR

TEMP1

= 0.5, 0.82, 1

*FOR BEST RESULTS, LIMIT C

AIN1

AND C

AIN2

TO 10pF.

TEMP1

AGND

AIN1

TEMP2

TEMP3

AIN2

1μF

0.01μF

1μF

MAX1329

MAX1330

Figure 31. Temperature Measurement with Two Remote Sensors

Programmable-Gain Instrumentation

Amplifier

Two op amps and two SPDT switches are configured

as a programmable-gain instrumentation amplifier in

Figure 32. It includes a differential input and a single-

ended output. SPDT1 and SPDT2 are configured as

single-pole, double-throw switches. The gain is set by

the following equations:

for switch position 1, and

for switch position 2.

OUT IN IN

⎛

⎝

⎜

⎞

⎠

⎟

−

+ −

1( )

OUT IN IN

⎛

⎝

⎜

⎞

⎠

⎟

−

+ −

1( )

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 77 78

MAX1329/MAX1330 1

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