IC-PD3948_11 Datasheet, PDF(2/10 Page) IC-Haus GmbH – 5-CH. PHASED ARRAY SINE ENCODER (39-2048)

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IC-PD3948_11 Datasheet, PDF (2/10 Pages) IC-Haus GmbH – 5-CH. PHASED ARRAY SINE ENCODER (39-2048)

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iC-PD3948

preliminary

5-CH. PHASED ARRAY SINE ENCODER (39-2048)

Rev B5, Page 2/10

DESCRIPTION

iC-PD3948 is an optical sensor IC with integrated

photodiodes whose signal currents are converted

into output voltages by low-noise transimpedance

ampliï¬ers.

Due to a high transimpedance gain of typically

4 Mâ¦, output signal voltages of several hundred Mil-

livolts are obtained at illumination levels of just 1 to

3 mW/cm2. In most cases complicated noise sup-

pression measures are thus rendered unnecessary.

As the pin names would suggest, iC-PD3948 is typ-

ically applied as a sine encoder for motor feedback

systems. To this end, iC-PD3948 provides sine and

cosine signals with both a high resolution of 2048

PPR (plus an additional index signal) and a low res-

olution of 1 PPR (at C/D).

All code disc signal tracks are evaluated differentially;

the high resolution sine signals are read by photo-

diodes in a phased array. The layout of the signal

ampliï¬ers is such that there is good paired channel

matching, reducing the time and effort required for

calibration to an absolute minimum.

The spectral sensitivity ranges from visible to near

infrared light, with the maximum sensitivity close to

a wavelength of 680 nm. An output voltage of 1 V

is typical in low light conditions, for instance when iC-

PD is illuminated at only 2 mW/cm2 by a 740 nm LED.

A relatively low LED current is enough to operate the

sensor, proving beneï¬cial to the life expectancy of the

LED at high operating temperatures.

PACKAGES AND CHIP LAYOUT INFORMATION

PAD LAYOUT (2.88 mm x 3.37 mm)

PAD FUNCTIONS

No. Name Function

1 VCC +4.5...5.5 V Supply Voltage

2 VREF Reference Voltage Output

3 PSIN Sine Track +

4 NSIN Sine Track -

5 PCOS Cosine Track +

6 NCOS Cosine Track -

Z Index Signal

8 NZ Z Index Track -

9 ND D Track -

10 PD D Track +

11 NC C Track -

12 PC C Track +

13 VRDC D/C Track Reference

14 VRSC S/C Track Reference

15 GND Ground

Notes: All outputs are analog voltage

outputs.

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