Bidirectional level translators

25 August 2004 Analogue, Mixed Signal, LSI

Analog Devices offers bidirectional level translators that it says add functionality while saving on complexity and component count. The ADG3308 is the first model of a series of wide range logic level translators that operate from 1,2 to 5,5 V and offer data speeds up to 40 Mbps.

These devices differ from traditional bus switches in several ways: wider translation range; no need for DIR pin; translate in Up or Down direction; no need for external pull-up resistors; access to <2,5 V logic circuits from traditional 3,3 and 5 V ICs.

The features allow system designers to implement solutions using a mix of high and low voltage circuitry in an application without resorting to complex translation solutions involving many discrete components. A 1,5 V ASIC can easily communicate with a 3,3 V DAC when the ADG3308 is placed in the signal path between the devices. In addition, the ADG3308 does not have an external DIR pin to select the data direction - it is automatically sensed by each individual channel in the device, allowing adjacent channels to transmit data in opposite directions simultaneously. This increases throughput over solutions requiring separate read/write cycles.

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