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iC-DL
3-CHANNEL DIFFERENTIAL LINE DRIVER
Rev B1, Page 1/9 FEATURES o o o o o o o o o o o o o o o 6 current-limited and short-circuit-proof push-pull drivers Differential 3-channel operation selectable Integrated impedance adaption for 30 to 140 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 APPLICATIONS o Line drivers for 24 V control engineering o Linear scales and encoders o MR sensor systems
PACKAGES
QFN28 5 x 5 mm
BLOCK DIAGRAM
VCC ERROR DETECTION TNER MODE NER
1
ENA
PLC
&
UNDERVOLTAGE & OVERTEMPERATURE VB1
E1 1
A1
vert. 8V/div.
hor. 2s/div
A2 E2 0 VB2 A3 1 E4 0 VB3 A5 1 A6 E6 0
E3
A4
E5
DIFF
LINE 100 m
GND1 GND2 GND3 GND4
iC-DL
Copyright (c) 2009 iC-Haus
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 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 mm JEDEC MO-220-VHHD-1
PIN CONFIGURATION QFN28 5 x 5 mm2
28 27 26 25 24 23 22
1 2 3 4 5 6 7
21 20 19
DL code... ...
8 9 10 11 12 13 14
18 17 16 15
PIN FUNCTIONS No. Name Function 1 E1 Input Channel 1 2 E2 Input Channel 2 3 E3 Input Channel 3 4 n.c.
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 Supply Voltage Driver Supply Voltage VB1, VB2, VB3 Voltage at E1...6, A1...6, DIFF, ENA, TNER, NXS, CXS1, CXS6 Driver Output Current (x=1...6) Input Current Driver E1...E6, Diff, ENA, TNER, NXS Voltage at NER Current in NER ESD Suceptibility at all pins Operating Junction Temperature Storage Temperature Range HBM 100 pF discharged through 1.5 k -40 -40 pulse tested pulse tested Conditions Min. 0 0 0 -800 -4 0 -4 Max. 7 40 36 800 4 36 25 2 140 150 V V V mA mA V mA kV C C Unit
G001 VCC G002 VBx G003 V() G004 I(Ax) G005 I(Ex) G006 V(NER) G007 I(NER) G008 V() G009 Tj G010 Ts
THERMAL DATA
Operating Conditions: VB = 4...32 V, VCC = 4...5.5 V Item No. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range (extended range to -40C on request) Thermal Resistance Chip to Ambient surface mounted, thermal pad soldered to approx. 2 cm heat sink Conditions Min. -25 40 Typ. Max. 125 C K/W Unit
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.
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. 001 002 003 004 005 006 007 008 009 010 Symbol Parameter Conditions Min. VBx I(VBx) I(VBx) I(VBx) I(VBx) IO(Ax) VCC I(VCC) I(VCC) Vc()lo Supply Voltage Range (Driver) Supply Current in VB1...3 Supply Current in VB1...3 Supply Current in VB1, Outputs A1...2 Tri-State Supply Current in VB2...3, Outputs A3...6 Tri-State Output Leakage Current Supply Voltage Range (Logic) Supply Current in VCC Supply Current in VCC Clamp Voltage low at pins VB1...3, A1...6, E1...6, DIFF, ENA TNER, NER, VCC Clamp Voltage high at Vcc Clamp Voltage high at pins VB1...3, A1...6, E1...6, DIFF, ENA TNER, NER Supply Current in VB1...3 Saturation Voltage low Saturation Voltage low Short circuit current low Short circuit current low Output resistance Slew Rate low Free Wheel Clamp Voltage low Saturation Voltage high Saturation Voltage high Short circuit current high Short circuit current high Output resistance Slew Rate high Free Wheel Clamp Voltage high ENA = hi, Ax = lo ENA = hi, Ax = hi I() = -10 mA, all other pins open -1.2 Ax = lo Ax = hi ENA = lo, V(A1...2) = -0.3...(VB + 0.3 V) ENA = lo, V(A3...6) = -0.3...(VB + 0.3 V) ENA = lo, V(Ax) = 0 ... VB -20 4 5 1.5 4 Typ. Max. 32 1.5 3 1.2 1 20 5.5 10 5 -0.4 V mA mA mA mA A V mA mA V Unit
General (x=1..6)
011 012
Vc()hi Vc()hi
I() = 10 mA I() 2 mA, all other pins open
5.6 40
7 64
V V
013 101 102 103 104 105 106 107 201 202 203 204 205 206 207
I(VBx) Vs(Ax)lo Vs(Ax)lo Isc(Ax)lo Isc(Ax)lo Rout(Ax) SR(Ax)lo Vc(Ax)lo Vs(Ax)hi Vs(Ax)hi Isc(Ax)hi Isc(Ax)hi Rout(Ax) SR(Ax)hi Vc(Ax)hi
ENA = hi, f(E1...6) = 1 MHz I(Ax) = 10 mA, Ax = low I(Ax) = 30 mA, Ax = low V(Ax) = 1.5 V V(Ax) = VB, Ax = low VB = 10...40 V, V(Ax) = 0.5 * VB VB = 40 V, Cl(Ax) = 100 pF I(Ax) = -100 mA Vs(Ax)hi = VB - V(Ax), I(Ax) = -10 mA Vs(Ax)hi = VB - V(Ax), I(Ax) = -30 mA, Ax = hi V(Ax) = VB - 1.5 V, Ax = hi V(Ax) = 0 V, Ax = hi VB = 10...40 V, V(Ax) =0.5 * VB VB= 40 V, Cl(Ax) = 100 pF I(Ax) = 100 mA, VB = VCC = GND -90 -800 40 200 0.5 40 200 -1.3 40
3
10 0.2 0.4
mA V V mA mA V/s V V V mA mA V/s V
Driver Outputs A1...6, Low-Side-action (x = 1...6)
60 75 600
90 800 100 -0.5 0.2 0.4
Driver Outputs A1...6, High-Side-action (x = 1...6)
-60 75 400
-40 100 1.3
Inputs E1...6, DIFF, ENA, TNER 601 602 603 604 605 701 Vt()hi Vt()lo Vt()hys Ipd() Ipd() VBon Threshold Voltage high Threshold Voltage low Input Hysteresis Pull-Down-Current Pull-Down-Current Threshold Value at VB1 for Undervoltage Detection on (NER low) Threshold Value at VB1 for Undervoltage Detection off (NER high) Vt()hys = Vt()hi - Vt()lo V() = 0.8 V V() 40 V |VB1 - VB2| & |VB2 - VB3| & |VB1 - VB3| < 0.75 V |VB1 - VB2| & |VB2 - VB3| & |VB1 - VB3| < 0.75 V 3 0.8 200 10 400 800 80 160 3.95 2 V V mV A A V
Supply Voltage Control VB
702
VBoff
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. 703 801 Symbol VBhys V(VBx) Parameter Hysteresis Conditions Min. VBhys = VBon - VBoff 150 0.75 Typ. 250 1.85 Max. mV V Unit
Supply Voltage Difference Control VB1...3 Threshold Condition for Supply V(VBx) = MAX (|VB1 - VB2| , Voltage Difference between VB1, |VB2 - VB3| , |VB1 - VB3| ) VB2 and VB3 NER low Threshold Value at VCC for Undervoltage Detection on Threshold Value at VCC for Undervoltage Detection off Hysteresis Thermal Shutdown Threshold Thermal Lock-on Threshold Thermal Shotdown Hysteresis Saturation Voltage low at NER Leakage Current at NER Supply Voltage for NER function Thys = Ton - Toff I(NER) = 5 mA, NER = lo 12 -10 2.9 V(NER) = 0 V...VB, NER = hi I(NER) = 5 mA, NER = lo, Vs(NER) < 0.4 V DIFF = lo, Cl() = 100 pF, see Fig. 1 DIFF = lo, Cl() = 100 pF, see Fig. 1 NER low NER high VCChys = VCCon - VCCoff 3 250 145 130 12 0.4 20 10 600 175 165
Supply Voltage Control VCC 901 902 903 A01 A02 A03 B01 B02 B03 B04 VCCon VCCoff VCChys Toff Ton Thys Vs() Isc() IO() VCC 3.95 V V mV C C C V mA A V
Temperatur Control
Error Output NER Short Circuit Current low at NER V(NER) = 2...40 V, NER = lo
Time Delays I01 I02 I03 I04 I05 I06 I07 I08 I09 I10 I11 tplh(E-A) tphl(E-A) tplh(Ax) tphl(Ax) tplh(ENA) tplh(ENA) tphl(ENA) tphl(ENA) Propagation Delay Ex Ax Propagation Delay Ex Ax 100 100 30 30 130 100 200 250 100 130 0.5 400 200 100 100 300 200 500 500 250 400 2 ns ns ns ns ns ns ns ns ns ns s
Delay Skew DIFF = hi, Cl() = 100 pF, see Fig. 1 |A1 A2|, |A3 A4|, |A5 A6| Delay Skew DIFF = hi, Cl() = 100 pF, see Fig. 1 |A1 A2|, |A3 A4|, |A5 A6| Propagation Delay ENA Ax Propagation Delay ENA Ax Propagation Delay ENA Ax Propagation Delay ENA Ax Ex = hi, DIFF = lo, Cl() = 100 pF, Rl(Ax, GND) = 5 k, see Fig. 1 Ex = lo, DIFF = lo, Cl() = 100 pF, Rl(VB, Ax) = 100 k, see Fig. 1 Ex = lo, DIFF = lo, Rl(VB, Ax) = 5 k, see Fig. 1 Ex = hi, DIFF = lo, Rl(Ax, GND) = 5 k, see Fig. 1 E1, E3, E5 = hi, Cl() = 100 pF, see Fig. 1 E1, E3, E5 = lo, Cl() = 100 pF, see Fig. 1
tphl(DIFF) Propagation Delay DIFF A2, A4, A6 tplh(DIFF) Propagation Delay DIFF A2, A4, A6
tpll(TNER) Propagation Delay TNER NER Rl(VB, NER) = 5 k, Cl() = 100 pF, see Fig. 1
V
2.4V 2.0V
Input/Output
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 over a wide voltage range.
40 36 32 28
ever, further reflection of back travelling signals is prevented by an integrated impedance network, as shown in Figure 3.
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.
VB = 40 V
VE = hi
V(A) [V]
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, howFigure 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 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 cm) 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 iC-DL iC-DL Evaluation Board
Package QFN28 5 x 5 mm
Order Designation iC-DL QFN28 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

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