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IC-DL Schematic ( PDF Datasheet ) - IC-Haus

Teilenummer IC-DL
Beschreibung 3-CHANNEL DIFFERENTIAL LINE DRIVER
Hersteller IC-Haus
Logo IC-Haus Logo 




Gesamt 9 Seiten
IC-DL Datasheet, Funktion
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
FEATURES
o 6 current-limited and short-circuit-proof push-pull drivers
o Differential 3-channel operation selectable
o Integrated impedance adaption for 30 to 140 lines
o Wide power supply range from 4 to 40 V
o 200 mA output current (at VB = 24 V)
o Low output saturation voltage (< 0.4 V at 30 mA)
o Compatible with TIA/EIA standard RS-422
o Tristate switching of outputs enables use in buses
o Short switching times and high slew rates
o Low static power dissipation
o Schmitt trigger inputs with pull-down resistors, TTL and CMOS
compatible; voltage-proof up to 40 V
o Thermal shutdown with hysteresis
o Error message trigger input TNER
o Open-drain error output NER, active low with excessive chip
temperature and undervoltage at VCC or VB
o Option: Extended temperature range from -40 to 125 °C
Rev B1, Page 1/9
APPLICATIONS
o Line drivers for 24 V control
engineering
o Linear scales and encoders
o MR sensor systems
PACKAGES
QFN28 5 x 5 mm²
BLOCK DIAGRAM
TNER
ENA
E1
E2
E3
E4
E5
E6
DIFF
MODE
VCC
ERROR DETECTION
1
& UNDERVOLTAGE &
OVERTEMPERATURE
1
0
1
0
1
0
NER
VB1
A1
A2
VB2
A3
A4
VB3
A5
A6
iC-DL
GND1 GND2 GND3 GND4
vert. 8V/div. hor. 2µs/div
LINE 100 m
PLC
Copyright © 2009 iC-Haus
http://www.ichaus.com






IC-DL Datasheet, Funktion
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
DESCRIPTION
Rev B1, Page 6/9
Line drivers for control engineering couple TTL- or
CMOS-compatible digital signals with 24 V systems via
cables. The maximum permissible signal frequency is
dependent on the capacitive load of the outputs (ca-
ble length) or, more specifically, the power dissipation
in iC-DL resulting from this. To avoid possible short
circuiting the drivers are current-limited and shutdown
with excessive temperature.
ever, further reflection of back travelling signals is pre-
vented by an integrated impedance network, as shown
in Figure 3.
When the output is open the maximum output voltage
corresponds to supply voltage VB (with the exception
of any saturation voltages). Figure 2 gives the typical
DC output characteristic of a driver as a function of the
load. The differential output resistance is typically 75
over a wide voltage range.
Figure 3: Reflections caused by a mismatched line
termination
40
36 VB = 40 V
32
28
24
20
16
12
VB = 24 V
8
4
0
0 100 200 300
- I(A) [mA]
VE = hi
400 500
During a pulse transmission the amplitude at the iC-
DL output initially only increases to half the value of
supply voltage VB as the internal driver resistance and
characteristic line impedance form a voltage divider. A
wave with this amplitude is coupled into the line and
experiences after a delay a total reflection at the high-
impedance end of the line. At this position, the re-
flected wave superimposes with the transmitted wave
and generates a signal with the double wave amplitude
at the receiving device.
Figure 2: Load dependence of the output voltage
(High-side stage)
Figure 4: Pulse transmission and transit times
Each open-circuited input is set to low by an internal
pull-down current source; an additional connection to
GND increases the device’s immunity to interference.
The inputs are TTL- and CMOS-compatible. Due to
their high input voltage range, the inputs can also be
set to high-level by applying VCC or VB.
LINE EFFECTS
In PLC systems data transmission using 24 V sig-
nals usually occurs without a matched line termina-
tion. A mismatched line termination generates reflec-
tions which travel back and forth if there is also no line
adaptation on the driver side of the device. With rapid
pulse trains transmission is disrupted. In iC-DL, how-
After a further delay, the reflected wave also increases
the driver output to the full voltage swing. iC-DL’s inte-
grated impedance adapter prevents any further reflec-
tion and the achieved voltage is maintained along and
at the termination of the line.
A mismatch between iC-DL and the transmission line
influences the level of the signal wave first coupled
into the line, resulting in reflections at the beginning
of the line. The output signal may then have a num-
ber of graduations. Voltage peaks beyond VB or below
GND are capped by integrated diodes. By this way,
transmisssion lines with a characteristic impedance
between 30 and 140 permit proper operation.

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