iC-OG
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
FEATURES
APPLICATIONS
Monolithic construction with integrated photodiodes ensures
excellent matching and technical reliability
Short track spacing of 600
m
Elimination of dark currents through differential scanning
Photocurrent amplifier with high cut-off frequency
Comparators with precise signal-related hysteresis
Current-limited push-pull outputs
Adjustable LED current control for constant received power
Integrated power driver for the LED
LED current monitor with error message output
Integrated test aid
Low power consumption from 5V supply voltage
Available as a 20-pin BLCC or as chip
Options: extended temperature range of -30..110
C,
customized packages, reticle assembly
Optical position decoding using
the principle of differential
scanning
Incremental and absolute
encoder with a resolution of up
to 8 bits
CHIP
(3.05mm
5.1mm)
BLOCK DIAGRAM
1999
Rev B1
12 : 1
1.2V
IN
IP
1.2V
ERROR
VCC
5V +/- 10%
2
18
3
17
4
16
15
14
13
12
11
9
8
20
7
6
1
100nF
100nF
C1
R3
27k
C2
R2
30
R1
10k
5
10
19
OUTPUT
ANALOG
(see TRACK 3)
TRACK 3
DP6
DN6
DP7
DN7
(see TRACK 0)
TRACK 1
DP4
DP2
(see TRACK 0)
TRACK 2
DN1
DN4
DP5
DN5
TRACK 0
AMPLIFIER
c2
1
iC-OG
DN0
DDC
DP1
AMPLIFIER
AMPLIFIER
PUSH-PULL
PUSH-PULL
COMPARATOR
c2
1
TEST
BIAS
(see TRACK 3)
TRACK 7
(see TRACK 3)
TRACK 6
(see TRACK 3)
TRACK 5
OUTPUT
OUTPUT
MONITOR
LED-CURRENT CONTROL
TRACK 4
COMPARATOR
DN3
DP3
DN2
DP0
D1
LED
LED
NER
NI0
NI1
S6
S7
TIN
AGND
CSR
ISET
NI2
S0
S1
S2
S3
S4
S5
TIP
VCC
GND
BLCC OGC
iC-Haus GmbH
Tel
+49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
iC-OG
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev B1, Page 2/9
DESCRIPTION
The iC-OG device is an optoelectronic detector IC for linear and angle measuring systems, such as glass
scales or shaft encoders, for example. Photodiodes, amplifiers, comparators and TTL-compatible push-pull
output drivers are integrated monolithically. Each of the 8 tracks is evaluated differentially; there are also
analog outputs available from three of the special feature tracks.
The integrated LED current control with a driver stage enables a transmit diode with series resistor to be
directly connected and ensures a constant optical received power. The setpoint for the receive current is
adjusted using an external resistor. Should the LED current control deviate from its working range, this is
reported at the error message output.
Two test pins allow a full test of all functions to be carried out excluding the photodiodes.
All push-pull and analog outputs are protected against ESD and short-circuit damage. The error message
output NER is also protected against short-circuiting and can be used in bus systems due to its open-
collector output.
iC-OG
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev B1, Page 3/9
CHIP LAYOUT
Dimensions in
m; chip size 3.05mm
5.1mm
PAD DESCRIPTION
Name
Function
CSR
External capacitor for LED control
NI0
Track 0 Analog Push-Pull Output
NI1
Track 1 Analog Push-Pull Output
NI2
Track 2 Analog Push-Pull Output
LED
LED Driver Output
AGND
Reference Ground for ISET and CSR circuitry
ISET
LED Current Control Setup
TIN
Negative Test Aid Input
TIP
Positive Test Aid Input
NER
Error Message Output, low active
GND
Ground
S7
Track 7 Push-Pull Output
..
..
S0
Track 0 Push-Pull Output
VCC
+5V Supply Voltage
iC-OG
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev B1, Page 4/9
ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed.
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Max.
G001 VCC
Supply Voltage
-0.3
6
V
G301 V(S)
Voltage at Outputs S0..7
-0.3
VCC+0.3
V
G302 I(S)
Current in Outputs S0..7
V(S)< 0V or V(S)> VCC
-3
3
mA
G501 V(NI)
Voltage at Analog Outputs NI0..2
-0.3
VCC+0.3
V
G502 I(NI)
Current in Analog Outputs NI0..2
-3
3
mA
G601 I(TIP)
I(TIN)
Current in TIP, TIN
-1
1
mA
G701 I(ISET)
Current in ISET
-1
0.1
mA
G702 I(AGND)
Current in AGND
-5
5
mA
G703 I(LED)
Current in LED
V(LED)< 0 or V(LED)> VCC
-3
3
mA
G704 I(LED)
Current in LED
0< V(LED) < VCC
0
150
mA
G705 V(CSR)
Voltage at CSR
-0.3
VCC+0.3
V
G706 I(CSR)
Current in CSR
-3
3
mA
GA01 V(NER)
Voltage at NER
-0.3
6
V
E001 Vd()
ESD Susceptibility
MIL-STD 883, method 3015, HBM,
100pF discharged through 1.5k
2
kV
TG1 Tj
Junction Temperature
-30
125
C
TG2 Ts
Storage Temperature
see package specification
THERMAL DATA
Operating Conditions: VCC= 5V
10%
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Typ.
Max.
T1
Ta
Operating Ambient Temperature
Range
see package specification
All voltages are referenced to ground unless otherwise noted.
All currents into the device pins are positive; all currents out of the device pins are negative.
iC-OG
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev B1, Page 5/9
ELECTRICAL CHARACTERISTICS
Operating Conditions:
VCC= 5V
10%, Tj= -30..125
C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Total Device
001
VCC
Permissible Supply Voltage
Range
4.5
5.5
V
002
I(VCC)
Supply Current in VCC,
Outputs S0..7 hi
LED control active:
R(ISET/AGND)= 140k
,
I(LED)
8mA, NER=hi;
I(DP0..7)= 30nA,
I(DN0..7)= 3nA,
I(S0..7)= 0;
10
mA
003
I(VCC)
Supply Current in VCC,
Outputs S0..7 lo
LED control active:
R(ISET/AGND)= 14k
,
I(LED)
80mA, NER=hi;
I(DP0..7)= 3nA,
I(DN0..7)= 30nA,
I(S0..7)= 0;
10
mA
004
fo
Cut-off Frequency,
tracks 0..7
sinusoidal waveform,
I(DP0..7)= 3..30nA
I(DN0..7)= 30..3nA
100
kHz
005
tp(D-A)
Propagation Delay
see No. 4
2.5
s
006
Cut-off Frequency,
tracks 0..7
sinusoidal waveform,
I(DP0..7)= 6..60nA
I(DN0..7)= 60..6nA
200
kHz
007
Propagation Delay
see No. 6
1.5
s
Photodiodes and Amplifiers, tracks 0..7
101
Aph(D)
Radiant Sensitive Area
0.2
0.3
mm
102
S(
)max
Spectral Sensitivity
= 850nm
0.5
A/W
103
ar
Range of Spectral Sensitivity
S(
ar)= 0.1
S(
)max
500
1050
nm
104
I(D)
Permissible Photocurrent
90
nA
105
CM()
Common Mode DPi to DNi
0.85
1
1.15
Difference Comparators, tracks 0..7
201
Hys
Hysteresis referred to
[I(DPi) + I(DNi)] /2
I(DPi, DNi)= 3..90nA
8
11
17
%
Push-Pull Outputs S0..7
301
Vs()hi
Saturation Voltage hi
Vs()hi= VCC-V(); I()= -40
A
-30
27
85
125
0.79
0.69
0.58
0.51
0.9
V
V
V
V
V
302
Vs()hi
Saturation Voltage hi
Vs()hi= VCC-V(); I()= -400
A
-30
27
85
125
0.9
0.83
0.74
0.68
1.0
V
V
V
V
V
303
Vs()lo
Saturation Voltage lo
I()= 1.6mA
-30
27
85
125
0.21
0.22
0.25
0.27
0.4
V
V
V
V
V
304
Isc()hi
Short-Circuit Current hi
V()= 0V..VCC-1V
-7
-4.6
-1.5
mA
305
Isc()lo
Short-Circuit Current lo
V()= 0.4V..VCC
1.8
7.3
13
mA
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