IC-TW3 Datasheet, PDF(16/24 Page) IC-Haus GmbH – SENSOR SIGNAL CONDITIONER WITH TEMPERATURE COMPENSATION AND LINE DRIVER

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IC-TW3 Datasheet, PDF (16/24 Pages) IC-Haus GmbH – SENSOR SIGNAL CONDITIONER WITH TEMPERATURE COMPENSATION AND LINE DRIVER

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iC-TW3 SENSOR SIGNAL CONDITIONER WITH

TEMPERATURE COMPENSATION AND LINE DRIVER

Z SIGNAL PATH (INDEX)

Rev B1, Page 16/24

A third analog path is used for index signal processing

frequently found in encoder applications. Refer to Fig-

ure 5 for an overview. An input ampliï¬er with a gain

range of 0 to 36 dB is used to amplify the index signal

to an intermediate level. The input ampliï¬er employs

output referred offset correction. This is used to elimi-

nate inherent ampliï¬er offset as well as sensor offset.

Additionally, the same offset correction is used to skew

the comparator shift point to a desired level. The offset

correction is temperature compensated with a LUT.

VDD

ENSIGZ

OFSZ(5:0)

PINZ

NINZ

SINGLEINZ

VDD/2

GAINZ(2:0)

POLARITYZ

1Vpp

MODEZ

BYPASSZ

output

OGAINZ(1:0)

NZO

Figure 5: The Z signal path

Gain range

Gain step

Offset Range (input

referred*

Offset step input referred

Input Ampliï¬er

0..36 dB

6 dB

1.86 V

gaininput

Output Ampliï¬er

-3 dB, 0 dB, 6 dB

1.86 V

gaininput

60 mV

gaininput

gain_of _input_ampliï¬er _in_dB

*: gaininput = 10

Table 18: Gain and offset characteristics for channel Z

Composite

-3..42 dB

A single ended input referenced to VDD/2 is provided

by setting bit SINGLEINZ of register 0x02. Alterna-

tively, pin NINZ can be biased with an external voltage.

SINGLEINZ

Adr 0x02; Bit 1

R/W

Code

Function

channel Z input is differential (default)

channel Z is single ended

Table 19: Single ended input functionality

A zero-crossing comparator generates a 1.0 Vpeak-peak

output signal or a rail-to-rail signal depending on con-

trol bit MODEZ. The comparator can be bypassed

which allows using the Z Path as a regular ampliï¬er

path. Bypassing can be toggled via bit BYPASSZ of

MODEZ

Adr 0x02; Bit 3

R/W

Code

Function

1 Vpp out (default)

Rail-to-rail output

(requires OGAINZ(1:0) set to 0x2)

Table 20: Channel Z output mode select

BYPASSZ

Adr 0x02; Bit 2

R/W

Code

Function

Comparator is enabled (default)

Comparator is bypassed

Table 21: Channel Z comparator bypass

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