REVISIONS
NO
VERSION
APPROVED
The information disclosed herein was originated by and is the
property of MAZeT. MAZeT reserves all patent, proprietary, design,
use, sales, manufacturing an reproduction rights thereto. Product
names used in this publication are for identification purposes only
and may be trademark of their respective companies.
1
V 1.4
2001-08-27
Approvals
Date
MAZeT GmbH
Drawn:
2001-01-10
Checked:
2001-08-27
Status: DATA-SHEET
MAZeT GmbH Sales office
Gschwitzer Strae 32
D-07745 Jena / Germany
Phone: +49/3641-2809-0
Fax: +49/3641-2809-12
Email: sales@MAZeT.de
URL: http://www.MAZeT.de
Released:
2001-08-27
DOC. NO: DB-99-072e
Sheet 1 OF 10
DATA-SHEET
MTI04Bx / MTI08Bx
MULTI-CHANNEL PROGRAMMABLE GAIN
TRANSIMPEDANCE AMPLIFIER
Contents
1. GENERAL DESCRIPTION
2
2. BLOCK DIAGRAM
2
3. DESCRIPTION OF INTERFACE
3
3.1 Pinning
3
3.2 Adjustment of Transimpedance
3
4. DESCRIPTION OF FUNCTION
3
5. ELECTRICAL CHARACTERISTICS
3
5.1 Absolute Maximum Ratings
3
5.2 Operating Conditions
4
5.3 AC/DC-Characteristics
4
5.3.1 Offset Voltage At Input INX
5
5.3.2 Leakage Current At Input INX
6
5.3.3 DC-Transfer-Curves
7
6. PACKAGES
8
6.1 Shape and Dimensions
8
6.2 Pin-Configuration
8
7. APPLICATIONS
9
7.1 Example for Position Measurement
9
7.2 Connection of A Colour Sensor
9
8. ORDERING INFORMATION
10
9. CONTACT
10
REVISIONS
NO
VERSION
APPROVED
1
V 1.4
2001-08-27
The information in this publication is believed to be accurate in all respects at the time of
publication. MAZeT reserves the right to make changes in its products without notice in
order to improve design or performance characteristics.
DOC. NO:
DB-99-
072e
Sheet 2 of 10
DATA-SHEET MTI04Bx / MTI08Bx
1. GENERAL DESCRIPTION
The MTI-devices are a family of integrated circuits of programmable gain
transimpedance amplifiers with different numbers of channels (4 or 8).
The MTI-devices are mainly used for signal conditioning of sensors with current
outputs. They are especially suitable for connection of photodiodes of array and row
sensors.
The possibility to adjust the transimpedance in 3 stages is a special feature.
The adjustment is made by programming two pins and is valid for all channels together.
The device packages are optimized for COB-mounting.
2. BLOCK DIAGRAM
Rf
Cc
SW1 SW2
IN1
VREF
OUT1
OPAMP 1
-
-
-
-
+
+
+
+
Rf
Cc
INX
OUTX
OPAMP X
-
-
-
-
+
+
+
+
MTI
VDD GND
50k
=
=
=
=
-
-
-
-
=
=
=
=
150k
GND
REVISIONS
NO
VERSION
APPROVED
1
V 1.4
2001-08-27
The information in this publication is believed to be accurate in all respects at the time of
publication. MAZeT reserves the right to make changes in its products without notice in
order to improve design or performance characteristics.
DOC. NO:
DB-99-
072e
Sheet 3 of 10
DATA-SHEET MTI04Bx / MTI08Bx
3. DESCRIPTION OF INTERFACE
3.1 Pinning
signal name
Typ.
a/d
a
function
VDD
input
a/d
power supply (
+
)
GND
input
a/d
power supply (
-
)
SW1
input
d
input 1 for adjustment of transimpedance of MTI-
amplifier (pull down)
SW2
input
d
input 2 for adjustment of transimpedance of MTI-
amplifier (pull down)
INX
input
a
analog current input of amplifier X
OUTX
output
a
analog voltage output of amplifier X
a.) analog or digital
3.2 Adjustment Of Transimped ance
settings of digital inputs
SW1
SW2
transimpedance Rf
GND
VDD
5M
stage 1
VDD
GND
500k
stage 2
GND
GND
25k
a
stage 3
VDD
VDD
not used
a.) default by pull down
4. DESCRIPTION OF FUNCTION
The MTI-devices are programmable gain transimpedance amplifiers with different numbers
of channels (MTI04 4 channels; MTI08 8 channels). There is one transimpedance
amplifier per channel between a current input INX and a voltage output OUTX. Its
transimpedance is selectable in 3 stages. This adjustment can be effected by setting of
digital inputs SW1 and SW2 and is valid for all channels simultaneously (headline 3.2). The
inputs SW1 and SW2 are pulled down with a resistor for a default feedback resistor of
25k
.
The second input of all transimpedance amplifiers is used for a common supply by a
reference voltage necessarily fed in through the pin VREF.
All channels are compensated for an external input capacitance of the photo-sensor of
typical 20pF.
The power supply for the MTI-devices is typical 5V between VDD and GND.
5. ELECTRICAL CHARACTERISTICS
5.1 Absolute Maximum Rating s
Violations of absolute maximum ratings are not allowed under any circumstances.
All voltages are referenced to VSS = 0V.
parameter
name
min.
max.
unit
power supply
VDD
-
0,3
7,0
V
input and output voltages
IC-pinning
-
0,3
VDD
+
0,3
V
power dissipation
P
OP
0,1
W
operating temperature
T
OP
0
85
C
storage temperature
T
STG
-
55
155
C
REVISIONS
NO
VERSION
APPROVED
1
V 1.4
2001-08-27
The information in this publication is believed to be accurate in all respects at the time of
publication. MAZeT reserves the right to make changes in its products without notice in
order to improve design or performance characteristics.
DOC. NO:
DB-99-
072e
Sheet 4 of 10
DATA-SHEET MTI04Bx / MTI08Bx
5.2 Operating Conditions
All voltages are referenced to VSS = 0V.
parameter
name
min.
typ.
max.
unit
condition
supply voltage
VDD
4,5
5
5,5
V
Bias current MTI04
I(VDD)
3
4
mA
27C
Bias current MTI08
I(VDD)
12
16
mA
27C
operating temperature
T
OP
0
27
85
C
input high level
V
IH
2,0
VDD+0,3
V
input low level
V
IL
-
0,3
0,8
V
reference voltage
VREF
1
2,5
4
V
5.3 AC/DC-Characteristics
Unless otherwise specified the data in this table is valid for T
OP
= 27C and VDD = 5V.
parameter
name
min.
typ.
max.
unit
condition
0,1
A
stage 1
1
A
stage 2
input current
INX
20
A
stage 3
4000
5000
6000
k
stage 1
400
500
600
k
stage 2
feedback resistor
Rf
20
25
30
k
stage 3
25
kHz
stage 1
70
kHz
stage 2
signal frequency at input
f
3dB
500
kHz
stage 3
temperature coefficient of
the feedback resistor
TC
Rf
-
3500
ppm/K
input offset voltage
V
OFF
8
mV
T
OP
= 85C
input leakage current
I
LEAK
500
pA
T
OP
= 85C
capacitive load at OUTX
C
LOAD
50
pF
I
LOAD
= 0,5mA
output voltage noise
V
NOISE
tbd
nV/
Hz
f = 1kHz
equivalent input current
noise
I
NOISE
tbd
pA/
Hz
f = 1kHz
pull down resistor at SW1
and SW2
R
PDSW
50
k
input capacitance of
external connected photo-
sensors
C
DIODE
20
pF
per input
REVISIONS
NO
VERSION
APPROVED
1
V 1.4
2001-08-27
The information in this publication is believed to be accurate in all respects at the time of
publication. MAZeT reserves the right to make changes in its products without notice in
order to improve design or performance characteristics.
DOC. NO:
DB-99-
072e
Sheet 5 of 10
DATA-SHEET MTI04Bx / MTI08Bx
5.3.1 Offset Voltage At Input INX
Offset Voltage Voff = f(VREF) -- Temp = 0C
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
VREF -- V
V
o
ff
--
m
V
VDD = 4.5V
VDD = 5.0V
VDD = 5.5V
Offset Voltage Voff = f(VREF) -- Temp = 27C
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
VREF -- V
V
o
ff
--
m
V
VDD = 4.5V
VDD = 5.0V
VDD = 5.5V
Offset Voltage Voff = f(VREF) -- Temp = 85C
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
VREF -- V
V
o
ff
--
m
V
VDD = 4.5V
VDD = 5.0V
VDD = 5.5V
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