ICHAUS IC-DL

iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 1/9
FEATURES
APPLICATIONS
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦ Line drivers for 24 V control
engineering
♦ Linear scales and encoders
♦ MR sensor systems
♦
♦
♦
♦
6 current-limited and short-circuit-proof push-pull drivers
Differential 3-channel operation selectable
Integrated impedance adaption for 30 to 140 Ω lines
Wide power supply range from 4 to 40 V
200 mA output current (at VB = 24 V)
Low output saturation voltage (< 0.4 V at 30 mA)
Compatible with TIA/EIA standard RS-422
Tristate switching of outputs enables use in buses
Short switching times and high slew rates
Low static power dissipation
Schmitt trigger inputs with pull-down resistors, TTL and CMOS
compatible; voltage-proof up to 40 V
Thermal shutdown with hysteresis
Error message trigger input TNER
Open-drain error output NER, active low with excessive chip
temperature and undervoltage at VCC or VB
Option: Extended temperature range from -40 to 125 °C
PACKAGES
QFN28 5 x 5 mm²
BLOCK DIAGRAM
VCC
ERROR DETECTION
MODE
TNER
NER
PLC
1
ENA
&
UNDERVOLTAGE &
OVERTEMPERATURE
VB1
A1
E1
vert. 8V/div.
hor. 2µs/div
1
A2
E2
0
VB2
E3
A3
1
A4
E4
0
VB3
E5
A5
1
A6
E6
0
LINE 100 m
DIFF
GND1
Copyright © 2009 iC-Haus
GND2
GND3
GND4
iC-DL
http://www.ichaus.com
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 2/9
DESCRIPTION
iC-DL is a fast line driver with six independent channels and integrated impedance adaptation for 30 to
140 Ω lines.
Channels are paired for differential 3-channel operation by a high signal at the DIFF input, providing
differential output signals for the three inputs E1, E3
and E5. All inputs are compatible with CMOS and
TTL levels.
The push-pull output stages have a driver power
of typically 200 mA from 24 V and are short-circuitproof and current-limited, shutting down with excessive temperature. For bus applications the output
stages can be switched to high impedance using input ENA.
iC-DL monitors supply voltages VB and VCC and the
chip temperature, switching all output stages to high
impedance in the event of error and set NER activ
low. In addition, the device also monitors voltage
differences at the pins VB1, VB2 and VB3 and generates an error signal if the absolut value exceeds
0.75 V.
The open-drain output NER allows the device to be
wired-ORed to the relevant NER error outputs of
other iC-DLs. Via input TNER the message outputs
of other ICs can be extended to generate system error messages. NER switches to high impedance if
supply voltage VCC ceases to be applied.
The device is protected against ESD.
PACKAGES QFN28 5 x 5 mm² JEDEC MO-220-VHHD-1
PIN CONFIGURATION QFN28 5 x 5 mm2
28
27
26
25
24
23
22
1
21
2
20
3
19
DL
code...
...
4
5
6
7
8
9
10
11
PIN FUNCTIONS
No. Name Function
1 E1
Input Channel 1
2 E2
Input Channel 2
3 E3
Input Channel 3
4 n.c.
12
18
17
16
15
13
14
PIN FUNCTIONS
No. Name Function
5 E4
Input Channel 4
6 E5
Input Channel 5
7 E6
Input Channel 6
8 VCC +5 V Supply
9 n.c.
10 TNER Error Input, low active
11 NER Error Output, active low
12 A6
Output Channel 6
13 GND4 Ground
14 VB3 +4.5 ... 40 V Power Supply
15 A5
Output Channel 5
16 GND3 Ground
17 A4
Output Channel 4
18 VB2 +4.5 ... 40 V Power Supply
19 A3
Output Channel 3
20 GND2 Ground
21 A2
Output Channel 2
22 VB1 +4.5 ... 40 V Power Supply
23 GND1 Ground
24 A1
Output Channel 1
25 n.c.
26 ENA Enable Input, high active
27 n.c.
28 DIFF Differential Mode Input, high active
The pins VB1, VB2 and VB3 must be connected to the same driver supply voltage VB. The pins GND1, GND2,
GND3 and GND4 must be connected to GND. To improve heat dissipation, the thermal pad at the bottom of the
package should be joined to an extended copper area which must have GND potential.
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 3/9
ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed. Absolute Maximum Ratings are no Operating Conditions.
Integrated circuits with system interfaces, e.g. via cable accessible pins (I/O pins, line drivers) are per principle endangered by injected
interferences, which may compromise the function or durability. The robustness of the devices has to be verified by the user during system
development with regards to applying standards and ensured where necessary by additional protective circuitry. By the manufacturer
suggested protective circuitry is for information only and given without responsibility and has to be verified within the actual system with
respect to actual interferences.
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
G001 VCC
Supply Voltage
G002 VBx
Driver Supply Voltage VB1, VB2, VB3
G003 V()
Voltage at E1...6, A1...6, DIFF, ENA,
TNER, NXS, CXS1, CXS6
G004 I(Ax)
Driver Output Current (x=1...6)
G005 I(Ex)
Input Current Driver E1...E6, Diff, ENA,
TNER, NXS
G006 V(NER)
Voltage at NER
G007 I(NER)
Current in NER
G008 V()
ESD Suceptibility at all pins
G009 Tj
G010 Ts
pulse tested
pulse tested
Max.
0
7
V
0
40
V
0
36
V
-800
800
mA
-4
4
mA
0
36
V
-4
25
mA
2
kV
Operating Junction Temperature
-40
140
°C
Storage Temperature Range
-40
150
°C
HBM 100 pF discharged through 1.5 k Ω
THERMAL DATA
Operating Conditions: VB = 4...32 V, VCC = 4...5.5 V
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
T01
Ta
Operating Ambient Temperature Range
(extended range to -40°C on request)
T02
Rthja
Thermal Resistance Chip to Ambient
Typ.
-25
surface mounted, thermal pad soldered to
approx. 2 cm² heat sink
All voltages are referenced to ground unless otherwise stated.
All currents into the device pins are positive; all currents out of the device pins are negative.
Max.
125
40
°C
K/W
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 4/9
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB1...3 = 4.5...32 V, VCC = 4...5.5 V, Tj = -40...140 °C, unless otherwise noted
input level lo = 0...0.45 V, hi = 2.4 V...VCC, timing diagram see fig. 1
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
General (x=1..6)
001
VBx
Supply Voltage Range (Driver)
002
I(VBx)
Supply Current in VB1...3
Ax = lo
4
003
I(VBx)
Supply Current in VB1...3
Ax = hi
004
I(VBx)
Supply Current in VB1,
Outputs A1...2 Tri-State
ENA = lo,
V(A1...2) = -0.3...(VB + 0.3 V)
005
I(VBx)
Supply Current in VB2...3, Outputs A3...6 Tri-State
ENA = lo,
V(A3...6) = -0.3...(VB + 0.3 V)
1
mA
006
IO(Ax)
Output Leakage Current
ENA = lo, V(Ax) = 0 ... VB
-20
20
µA
007
VCC
Supply Voltage Range (Logic)
4
5.5
V
008
I(VCC)
Supply Current in VCC
ENA = hi, Ax = lo
5
10
mA
009
I(VCC)
Supply Current in VCC
ENA = hi, Ax = hi
1.5
5
mA
010
Vc()lo
Clamp Voltage low at pins
VB1...3, A1...6, E1...6, DIFF,
ENA TNER, NER, VCC
I() = -10 mA, all other pins open
-1.2
-0.4
V
011
Vc()hi
Clamp Voltage high at Vcc
I() = 10 mA
5.6
7
V
012
Vc()hi
Clamp Voltage high at pins
VB1...3, A1...6, E1...6, DIFF,
ENA TNER, NER
I() ≤ 2 mA, all other pins open
40
64
V
013
I(VBx)
Supply Current in VB1...3
ENA = hi, f(E1...6) = 1 MHz
10
mA
0.2
V
3
32
V
1.5
mA
3
mA
1.2
mA
Driver Outputs A1...6, Low-Side-action (x = 1...6)
101
Vs(Ax)lo
Saturation Voltage low
I(Ax) = 10 mA, Ax = low
102
Vs(Ax)lo
Saturation Voltage low
I(Ax) = 30 mA, Ax = low
103
Isc(Ax)lo
Short circuit current low
V(Ax) = 1.5 V
104
Isc(Ax)lo
Short circuit current low
V(Ax) = VB, Ax = low
105
Rout(Ax)
Output resistance
106
SR(Ax)lo
107
Vc(Ax)lo
40
60
VB = 10...40 V, V(Ax) = 0.5 * VB
40
75
Slew Rate low
VB = 40 V, Cl(Ax) = 100 pF
200
600
Free Wheel Clamp Voltage low
I(Ax) = -100 mA
-1.3
0.4
V
90
mA
800
mA
100
Ω
V/µs
-0.5
V
Driver Outputs A1...6, High-Side-action (x = 1...6)
201
Vs(Ax)hi
Saturation Voltage high
Vs(Ax)hi = VB - V(Ax),
I(Ax) = -10 mA
0.2
V
202
Vs(Ax)hi
Saturation Voltage high
Vs(Ax)hi = VB - V(Ax),
I(Ax) = -30 mA, Ax = hi
0.4
V
203
Isc(Ax)hi
Short circuit current high
V(Ax) = VB - 1.5 V, Ax = hi
-90
-60
-40
mA
204
Isc(Ax)hi
Short circuit current high
V(Ax) = 0 V, Ax = hi
-800
205
Rout(Ax)
Output resistance
VB = 10...40 V, V(Ax) =0.5 * VB
40
75
100
206
SR(Ax)hi
Slew Rate high
VB= 40 V, Cl(Ax) = 100 pF
200
400
207
Vc(Ax)hi
Free Wheel Clamp Voltage high
I(Ax) = 100 mA,
VB = VCC = GND
0.5
mA
Ω
V/µs
1.3
V
2
V
800
mV
Inputs E1...6, DIFF, ENA, TNER
601
Vt()hi
Threshold Voltage high
602
Vt()lo
Threshold Voltage low
603
Vt()hys
Input Hysteresis
Vt()hys = Vt()hi - Vt()lo
200
604
Ipd()
Pull-Down-Current
V() = 0.8 V
10
80
µA
605
Ipd()
Pull-Down-Current
V() ≤ 40 V
160
µA
3.95
V
0.8
V
400
Supply Voltage Control VB
701
VBon
Threshold Value at VB1 for Undervoltage Detection on
(NER ⇒ low)
|VB1 - VB2| & |VB2 - VB3| & |VB1 - VB3| <
0.75 V
702
VBoff
Threshold Value at VB1 for Undervoltage Detection off
(NER ⇒ high)
|VB1 - VB2| & |VB2 - VB3| & |VB1 - VB3| <
0.75 V
3
V
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 5/9
ELECTRICAL CHARACTERISTICS
Operating Conditions: VB1...3 = 4.5...32 V, VCC = 4...5.5 V, Tj = -40...140 °C, unless otherwise noted
input level lo = 0...0.45 V, hi = 2.4 V...VCC, timing diagram see fig. 1
Item
No.
703
Symbol
VBhys
Parameter
Conditions
Hysteresis
Unit
VBhys = VBon - VBoff
Min.
Typ.
150
250
Max.
mV
Supply Voltage Difference Control VB1...3
801
∆V(VBx)
Threshold Condition for Supply
∆V(VBx) = MAX (|VB1 - VB2| ,
Voltage Difference between VB1, |VB2 - VB3| , |VB1 - VB3| )
VB2 and VB3
NER ⇒ low
0.75
1.85
V
3.95
V
Supply Voltage Control VCC
901
VCCon
Threshold Value at VCC for Undervoltage Detection on
NER ⇒ low
902
VCCoff
Threshold Value at VCC for Undervoltage Detection off
NER ⇒ high
903
VCChys
Hysteresis
VCChys = VCCon - VCCoff
3
250
V
600
mV
Temperatur Control
A01
Toff
Thermal Shutdown Threshold
145
175
°C
A02
Ton
Thermal Lock-on Threshold
130
165
°C
A03
Thys
Thermal Shotdown Hysteresis
Thys = Ton - Toff
I(NER) = 5 mA, NER = lo
12
°C
Error Output NER
B01
Vs()
Saturation Voltage low at NER
B02
Isc()
Short Circuit Current low at NER V(NER) = 2...40 V, NER = lo
B03
IO()
Leakage Current at NER
V(NER) = 0 V...VB, NER = hi
-10
B04
VCC
Supply Voltage for NER function
I(NER) = 5 mA, NER = lo,
Vs(NER) < 0.4 V
2.9
12
0.4
V
20
mA
10
µA
V
Time Delays
I01
tplh(E-A)
Propagation Delay Ex ⇒ Ax
DIFF = lo, Cl() = 100 pF, see Fig. 1
100
400
ns
I02
tphl(E-A)
Propagation Delay Ex ⇒ Ax
DIFF = lo, Cl() = 100 pF, see Fig. 1
100
200
ns
I03
∆tplh(Ax)
Delay Skew
DIFF = hi, Cl() = 100 pF, see Fig. 1
|A1 ⇒ A2|, |A3 ⇒ A4|, |A5 ⇒ A6|
30
100
ns
I04
∆tphl(Ax)
Delay Skew
DIFF = hi, Cl() = 100 pF, see Fig. 1
|A1 ⇒ A2|, |A3 ⇒ A4|, |A5 ⇒ A6|
30
100
ns
I05
tplh(ENA)
Propagation Delay ENA ⇒ Ax
Ex = hi, DIFF = lo, Cl() = 100 pF,
Rl(Ax, GND) = 5 kΩ, see Fig. 1
130
300
ns
I06
tplh(ENA)
Propagation Delay ENA ⇒ Ax
Ex = lo, DIFF = lo, Cl() = 100 pF,
Rl(VB, Ax) = 100 kΩ, see Fig. 1
100
200
ns
I07
tphl(ENA)
Propagation Delay ENA ⇒ Ax
Ex = lo, DIFF = lo,
Rl(VB, Ax) = 5 kΩ, see Fig. 1
200
500
ns
I08
tphl(ENA)
Propagation Delay ENA ⇒ Ax
Ex = hi, DIFF = lo,
Rl(Ax, GND) = 5 kΩ, see Fig. 1
250
500
ns
I09
tphl(DIFF) Propagation Delay
DIFF ⇒ A2, A4, A6
E1, E3, E5 = hi, Cl() = 100 pF, see Fig. 1
100
250
ns
I10
tplh(DIFF) Propagation Delay
DIFF ⇒ A2, A4, A6
E1, E3, E5 = lo, Cl() = 100 pF, see Fig. 1
130
400
ns
I11
tpll(TNER) Propagation Delay TNER ⇒ NER Rl(VB, NER) = 5 kΩ,
Cl() = 100 pF, see Fig. 1
0.5
2
µs
V
Input/Output
2.4V
2.0V
0.8V
0.45V
t
1
0
Figure 1: Reference levels for delays
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 6/9
DESCRIPTION
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 (cable 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.
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 Ω
over a wide voltage range.
VE = hi
VB = 40 V
32
28
V(A) [V]
Figure 3: Reflections caused by a mismatched line
termination
During a pulse transmission the amplitude at the iCDL 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 highimpedance end of the line. At this position, the reflected wave superimposes with the transmitted wave
and generates a signal with the double wave amplitude
at the receiving device.
40
36
ever, further reflection of back travelling signals is prevented by an integrated impedance network, as shown
in Figure 3.
24
20
16
12
VB = 24 V
8
4
0
0
100
200
300
400
500
- I(A) [mA]
Figure 2: Load dependence of the output voltage
(High-side stage)
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 signals usually occurs without a matched line termination. A mismatched line termination generates reflections 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-
Figure 4: Pulse transmission and transit times
After a further delay, the reflected wave also increases
the driver output to the full voltage swing. iC-DL’s integrated impedance adapter prevents any further reflection 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 number 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 Ω permit proper operation.
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 7/9
PRINTED CIRCUIT BOARD LAYOUT
The thermal pad at the bottom of the package improves thermal dissipation. The board layout has to
be designed so that an appropriate number of copper
vias below the thermal pad area form a good conductive path to the reverse of the board where a blank copper surface of sufficient size (approx. 2 cm²) carries off
heat. The thermal pad is to be soldered to the board
and must be connected to GND.
To smooth the local IC supply VCC and VBx, blocking capacitors must be connected directly to these pins
and to GND.
EVALUATION BOARD
iC-DL is in a QFN28 package and comes with a evaluation board for test purposes. Figures 5 and 6 show
both the wiring and the top of the evaluation board.
Figure 5: Circuit diagram of the evaluation board
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 8/9
Figure 6: Evaluation board (component side)
iC-Haus expressly reserves the right to change its products and/or specifications. An Infoletter gives details as to any amendments and additions made to the
relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by
email.
Copying – even as an excerpt – is only permitted with iC-Haus approval in writing and precise reference to source.
iC-Haus does not warrant the accuracy, completeness or timeliness of the specification on this site and does not assume liability for any errors or omissions
in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of
merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which
information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or
areas of applications of the product.
iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade
mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical
applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of
use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued
annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in
Hanover (Hannover-Messe).
We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations
of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can
be put to.
iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 9/9
ORDERING INFORMATION
Type
Package
Order Designation
iC-DL
QFN28 5 x 5 mm²
iC-DL QFN28
iC-DL Evaluation Board
iC-DL EVAL DL2D
For technical support, information about prices and terms of delivery please contact:
iC-Haus GmbH
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
Tel.: +49 (61 35) 92 92-0
Fax: +49 (61 35) 92 92-192
Web: http://www.ichaus.com
E-Mail: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners