IC-MQF Datasheet, PDF(23/37 Page) IC-Haus GmbH – PROGRAMMABLE 12-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

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IC-MQF Datasheet, PDF (23/37 Pages) IC-Haus GmbH – PROGRAMMABLE 12-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

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iC-MQF PROGRAMMABLE 12-BIT preliminary

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

SIGNAL CONDITIONING CH1, CH2

Rev A1, Page 23/37

It is recommended to use operating mode Test 5 for

the calibration of the sine signals. The sine signals are

also available in operating mode Calibration 2 for rea-

sons of compatibility to iC-MQ, but the amplitudes are

smaller (approx. 50% with respect to operating mode

Test 5).

Alternatively, characteristic digital test signals are

available for offset, amplitude and phase conditioning

in operating mode System Test.

Gain Settings

The gain is set in four steps:

1. The sensor supply controller is shut down and the

constant current source for the ACO output is set to

a suitable output current (register ACOT = 0x2, ACOR

and ACOS values close to the later operating point).

2. The coarse gain GR12 is selected so that differential

signal amplitudes of ca. 6 Vpp are produced in opera-

tion mode Test 5 (signal PSIN versus NSIN and PCOS

versus NCOS).

3. Using ï¬ne gain factor GF2 the cosine signal ampli-

tude is then adjusted to exactly 6 Vpp.

4. The sine signal amplitude can then be adjusted to

the cosine signal amplitude via ï¬ne gain factor GF1.

This results in a total gain of GR12 * GFi for differential

input signals.

1.5

GR12

Code

0x0

0x1

0x2

0x3

0x4

0x5

0x6

0x7

Notes

Adr 0x0a, bit 2:0

Range R12=0x9

3.0

12.0

6.0

24.6

7.8

31.8

10.2

40.2

13.2

52.2

15.6

63.0

19.8

79.2

24.0

96.0

Valid for all operation modes except for

Calibration 2 (reduces gain to 1/6).

Table 19: Gain Range CH1, CH2 (coarse)

GF2

Code

0x00

0x01

...

0x1F

Adr 0x0c, bit 4:0

Factor

1.00

1.06

GF 2

6.25 31

6.25

Table 20: Fine Gain Factor CH2

GF1

Code

0x000

0x001

...

0x7FF

Adr 0x0b, bit 6:0, Adr 0x0a, bit 7:4

Factor

1.0

1.0009

GF 1

6.25 1984

6.6245

Table 21: Fine Gain Factor CH1

iC-MQF

Test 5

VPx

VNx

GND

VPNx

Figure 7: Deï¬nition of 6 Vpp signal. Termination R0

must be high-ohmic during all Test and

Calibration modes.

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