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Curtiss-Wright KAD/ADC/129/S2, Manual, Page: 7 / 12

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Curtiss-Wright KAD/ADC/129/S2 Manual Download Page 7

KAD/ADC/129/S2

7

1 Jun. 2021 | DST/V/081

CURTISSWRIGHT.COM 

Getting the most from the KAD/ADC/129/S2

Wiring configurations

Figures 2 to 4 show possible wiring configurations for the KAD/ADC/129/S2.

Figure 2: Second of 4 independent ½-bridge channels with matched pair completion resistors

Figure 3: Third of 4 independent potentiometer channels

Figure 4: Fourth of 4 independent differential ended channels

EXC_V(1)-

ANALOG(1)-

ANALOG(1)+

KAD/ADC/129/S2

+
-

ANALOG

DIGITAL

COUNTS

 UNITS

+
-

DIGITAL
ANALOG

SENSE(1)-

GAIN [1, 10, 100, 1000]

INST. AMP

AAAF

DIGITAL FILTER

LOOKUP TABLE

34.8K [RADJ ]

VADJ

DIGITAL
ANALOG

VREF

+
-

EXC_V(1)+

+

-

+

-

S

T

A

NDA

RD 

B

U

S

 INT

E

RF

A

CE

 A

N

D 

L

O

G

IC

SENSE(1)+

 51

 7

 8

 11
 10

 9

 12

EXC_V(2)-

ANALOG(2)-

ANALOG(2)+

KAD/ADC/129/S2

+
-

ANALOG

DIGITAL

COUNTS

 UNITS

+
-

DIGITAL

ANALOG

SENSE(2)-

GAIN [1, 10, 100, 1000]

INST. AMP

AAAF

DIGITAL FILTER

LOOKUP TABLE

34.8K [RADJ]

VADJ

DIGITAL

ANALOG

VREF

+
-

EXC_V(2)+

+

-

+

-

S

TAN

D

AR

D

 BU

S 

IN

T

ER

F

AC

E 

AN

D

 L

O

G

IC

SENSE(2)+

 51

GND

 13

 14

 17
 16

 15

 18

ANALOG(3)-

ANALOG(3)+

KAD/ADC/129/S2

+
-

ANALOG

DIGITAL

COUNTS

 UNITS

+
-

DIGITAL

ANALOG

GAIN [1, 10, 100, 1000]

INST. AMP

AAAF

DIGITAL FILTER

LOOKUP TABLE

34.8K [RADJ]

VADJ

DIGITAL

ANALOG

VREF

+
-

+

-

+

-

S

TAN

D

AR

D

 BU

S 

IN

T

ER

F

AC

E 

AN

D

 L

O

G

IC

 51

GND

 19

 20

 21

 24

 23
 22

Summary of Contents for KAD/ADC/129/S2

Page 1: ...ADC 129 S2 is a hard wired state machine that over samples all channels at a rate between 200ksps and 400ksps and digitally filters any noise above the user programmable cutoff frequency This is achieved using cascaded half band decimate by 2 x 15 tap Finite Impulse Response FIR filters followed by an 8th order Butterworth Infinite Impulse Response IIR filter with a default cutoff point set at a q...

Page 2: ...and write Power consumption 5V 100 180 mA 7V 15 30 mA Excludes current used by excitation 7V 10 25 mA Excludes current used by excitation 12V 50 80 mA 12V 40 70 mA total power 1 75 3 09 W Particular combinations of chassis and Acra KAM 500 modules may have power or current limitations For details see TEC NOT 016 Power dissipation TEC NOT 049 Power estimation and the relevant chassis data sheet Env...

Page 3: ...3kHz fin 10kHz fs 100kHz fc fs 4 0 35 0 8 FSR For 10kHz fin 15kHz fs 100kHz fc fs 4 Effective number of bits gain 1 10 12 13 5 bits fc 25kHz and secondary gain of 1 fc filter cutoff frequency gain 100 11 5 12 5 bits fc 25kHz and secondary gain of 1 gain 1000 9 10 5 bits fc 25kHz and secondary gain of 1 Crosstalk gain 1 10 100 100 90 dB fin 25kHz and secondary gain of 1 gain 1000 80 72 dB fin 25kHz...

Page 4: ...D 300 kΩ Module powered on measured at 3kHz TABLE 3 Bipolar DC voltage excitation outputs PARAMETER MIN TYP MAX UNITS CONDITION DETAILS Outputs 4 Applied per channel Output voltage operating range 0 5 1 V Bi polar excitation 5V is 10V across the bridge resolution 1 8 mV Bi polar excitation 1 8mV is 3 6mV across the bridge compliance 30 mA Per channel short circuit current 125 mA short circuit dura...

Page 5: ...s than 0 01 FSR 200 times lower than the error specified here drift 0 15 FSR Over temperature noise gain 1 0 5 mVrms As measured on analog input noise gain 10 0 05 mVrms As measured on analog input noise gain 100 1000 0 01 mVrms As measured on analog input Output resistance 34 8 kΩ 1 The balance line is permanently connected to ANALOG x input The line is intended for balancing strain gages so the ...

Page 6: ... sampling rate Excitation Amplitude 0 to 5 1 0 2 Required excitation in V for the top of the bridge Excitation is bipolar so entering 5V means 10V across the bridge Balance Type CurrentShunt CurrentShunt Specifies the balance type to be carried out on the bridge Balance Applied 71e 6 to 71e 6 0 Shunt current in A applied to the bridge Balance BalanceThisTime True False False Specifies if balancing...

Page 7: ...ANALOG SENSE 1 GAIN 1 10 100 1000 INST AMP AAAF DIGITAL FILTER LOOKUP TABLE 34 8K R ADJ VADJ DIGITAL ANALOG VREF EXC_V 1 STANDARD BUS INTERFACE AND LOGIC SENSE 1 51 7 8 11 10 9 12 EXC_V 2 ANALOG 2 ANALOG 2 KAD ADC 129 S2 ANALOG DIGITAL COUNTS UNITS DIGITAL ANALOG SENSE 2 GAIN 1 10 100 1000 INST AMP AAAF DIGITAL FILTER LOOKUP TABLE 34 8K RADJ VADJ DIGITAL ANALOG V REF EXC_V 2 STANDARD BUS INTERFACE...

Page 8: ...put configuration for the KAD ADC 129 S2 With this configuration the differential input amplifier removes common mode voltage or common mode pickup noise on the input lines For potentiometer circuits where the negative input is tied to ground excitation drift can have a direct impact on the input signal either as a gain or an offset error Note that excitation can drift up to 0 3 on an FSR of 5 1V ...

Page 9: ...onfiguration connecting the signal to ANALOG x ANALOG x must be connected to ground This data sheet shows an example potentiometer application which is not affected by this gain error Modules with RADJ connected externally might show this additional gain error offset but only if the balance adjust circuit is used and in the cases stated previously NOTE Gain error can be compensated at post process...

Page 10: ...t than suppression of aliasing set the same cutoff point on all channels even if the sampling rates are different Sense lines Sense lines are used to eliminate error due to voltage drop across lead resistance Sense lines can not be left unconnected they should be connected as close as possible to the bridge If however the sense lines are connected close to the module that is far from the bridge an...

Page 11: ... top of bridge 15 EXC_V 2 Bipolar DC voltage excitation outputs Excitation to bottom of bridge 16 ANALOG 2 Differential ended analog inputs Analog input connected to internal adjust 17 ANALOG 2 Differential ended analog inputs Analog input 18 SENSE 2 Bipolar DC voltage excitation outputs Sense line from bottom of bridge 19 SENSE 3 Bipolar DC voltage excitation outputs Sense line from top of bridge...

Page 12: ...r from the 7V power line for excitation and therefore cannot be used with KAM CHS 04L KAM CHS 05F KAM CHS 03F or KAM CHS 02F Revision history Supporting software Related documentation PART NUMBER DESCRIPTION KAD ADC 129 S2 Full bridge ADC voltage excitation programmable analog gain sense lines 25kHz b w 4ch at 100ksps REVISION DIFFERENCES STATUS KAD ADC 129 S2 First release Recommended for new pro...

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