Cirrus-logic AN31 Manual do Utilizador descarregar pdf (Página 22)

Figure 16. CS5516 or CS5520 and a 1 mV/V AC-Excited Load Cell.

10k

4.096 MHz

VA+ MDRV+

MDRV-

VD+

BX2

XIN

XOUT

0.1

2N3906

100.1

1.0 mV/V

VREF-

VREF+

2.5k

-5

VA-

VD-

-5

0.1 0.1

301

4.7 nF

301

4.7 nF

2.5k

200

2.5k

DGND

AIN+

AGND1 AGND2

AIN-

SMODE

SOD

SID

SCLK

DRDY

RST

MICREL

MIC4428

POST

PROCESSOR

(See Text)

Bridge

Sync

25X

Serial

Interface

4-bit D/A

Converter

Gain

Block

1,2,4,8

IN1

OUT1

IN2

OUT2

2-Channel

Delta-Sigma

Modulator

Channel

FIR

Filter

Calibration

BX1

CS5516

CS5520

16 or 20 bits

470pF

OP-27

10kg

(22lb)

-5

50 Conversions/sec before averaging

Bridge Transducer Digitizer Circuits

22 AN31REV3

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28

Application Note 1
2 AN31REV3 2
2 1 3
Resistor 4
Q1, Q2 Siliconix 6
AN31REV3 7 7
10 AN31REV3 10
AN31REV3 11 11
12 AN31REV3 12
AN31REV3 13 13
14 AN31REV3 14
AN31REV3 15 15
16 AN31REV3 16
AN31REV3 17 17
18 AN31REV3 18
AN31REV3 19 19
16 or 20 bits 20
AN31REV3 21 21
AN31REV3 23 23
24 AN31REV3 24
AN31REV3 25 25
26 AN31REV3 26
AN31REV3 27 27
• Notes • 28

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