iC-PN2656
preliminar y
Rev A4, Page 2/7
PHASED ARRAY NONIUS ENCODER 26-256
DESCRIPTION
The phased-array iC-PN2656 features 24 monolith-
ically integrated photosensors with active areas of
800 µm x 330 µm each. A high transimpedance gain
of typically 4 MΩ generates output signals of a few
hundret Millivolts already from illumination levels of
0.1 to 0.2 mW/cm
2
. In most cases no additional mea-
sures must be considered to filter for noise and inter-
ferences.
Analog nonius encoders are the typical applica-
tion for iC-PN2656. Its 3-track scanning features a
phased-array of 8 photosensors each per track, gen-
erating positive and negative going sine signals, as
well as positive and negative going cosine signals.
An excellent matching and common mode behavior
of the differential signal paths is obtained by a paired
amplifier design, reducing the needs for external sig-
nal calibration to an absolute minimum.
The spectral sensitivity range includes visible to near
infrared light, with the maximum sensitivity being
close to a wavelength of 680 nm. An output voltage
of approximately 1 V is typical under low light condi-
tions, for instance when iC-PN2656 is illuminated at
only 2 µW/mm
2
by an 740 nm LED. A threefold inten-
sity is sufficient when using iC-PN2656 for encoder
applications with typical disc and mask codes.
PACKAGES INFORMATION
PAD LAYOUT (2.88 mm x 3.37 mm)
PAD FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
VCC
VREF
PS_N
NS_N
PS_M
NS_M
PS_S
NS_S
NC_S
PC_S
NC_M
PC_M
NC_N
PC_N
GND
+4.5..5.5 V Supply Voltage
Reference Voltage Output
N-Track Sine +
N-Track Sine -
M-Track Sine +
M-Track Sine -
S-Track Sine +
S-Track Sine -
S-Track Cosine -
S-Track Cosine +
M-Track Cosine -
M-Track Cosine +
N-Track Cosine -
N-Track Cosine +
Ground
All outputs are analog voltage outputs.
ICHAUS [ IC-HAUS GMBH ]
