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24V Line Drivers with Impedance Adaption

Wed, 10/03/2012 - 7:58am
icHaus_24VThe integrated devices iC-HD2, iC-HD7 and iC-HE are line drivers for 5 V and 24 V industrial encoder/sensor applications. The output drivers are designed for cable impedances in the range of 30 to 140 Ohms. Due to the unique integrated wave impedance adaption, reflected signals coming from the non-terminated line end at the receiver will be absorbed and not back reflected again, thus maintaining signal integrity. For differential signal transmission, the four output stages (iC-HE: three output stages) are designed as complementary drivers.

The push-pull output stages are current limited and short circuit protected with thermal shutdown. The outputs can typically drive 200 mA at 24 V supply. For bus applications, the outputs of the iC-HD2 and iC-HD7 can be switched to a high impedance state using the NEN input.

The iC-HE contains a current source to supply a common LED encoder illumi­nation. Its output current can be set by an external resistor to be in the range of 1 to 50 mA. The iC-HD2 is equipped with a 5 V reference voltage, supporting up to 5 mA output current.

All devices feature an under-voltage / over-temperature monitor, which forces the outputs to high impedance in case of such an event. With iC-HD2, the open drain error output NERR will be activated. All inputs are CMOS and TTL compatible and ESD protected. The operating temperature range is from -25 C (-40 C optionally) up to 125 C.

The iC-HD7 device is available in the SO16 package while the iC-HE is available in the SO14 package. The iC-HD2 is available in the TSSOP20 package and can also be ordered with an optional thermal pad.

An enhanced version of iC-HD2, iC-HDH2 with thermal pad is also available. This includes increased shutdown temperature, and high voltage inputs.

iC-Haus GmbH, http://www.ichausamerica.com/
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