lnd 3045 analog sensor interface chip - sar adc with spi interface, speed sensor & ptat data sheet d general description ? complete frond - end for lvdts and resolvers up to 16 - bit data collection ? includes four 12 - bit r esolution s ar adcs and one 16 - bit r esolution sar adc with differential inputs ? on - chip bias vo ltage r eferences ? built - in ptat which acts as temperature sensor ? spi standard interface ? operating temperature range of 27 o c to 200 o c ? clock speed of 1mhz or higher ? maximum power dissipation of 23 mw under a supply voltage of 3.3v ? 48 - pin dip package ? excellen t monotonicity and linearity over temperature features lnd 3045 is an analog chip pro totype, which consists of five 12 - bit and one 16 - bit successive approximation register (sar) analog - to - dig ital converters (adc) with spi inte rface, a speed sensor and a proportional to absolute temperature (ptat) circuit. lnd 3045 provides a complete front - end solution for high temperature sensor applications including lvdts and resolvers. a nalog input range to sar adc can vary from v dd to v ss . adc normally remains in shutdown mode, powering up only for the conversions. this process of conversion is contro lled by enable pin of the adc and this results in a lot of power saving. all the bias voltages required for proper functioning of various i nternal components are generated inside the chip which eliminates the use of external voltage references. lnd 3045 provides a serial interface , wh ich is compatible with spi. proportional to absolute temperature ( ptat ) circuit acts as a temperature sensor that monitors the ambient temperature. output of ptat circuit is connected to one of the 12 - bit sar adc. speed sensor generates a pulse each time when a peak is detected in the applied differential input. lnd 3045 is available in a 48 - pin dip package, and it operates over a temperature range of 27 o c to 200 o c . applications ? lvdt & resolver front - end interface ? digital signal processing ? industrial process control ? battery powered systems product highlights ? five analog differential input channels for sar adcs ? spi serial interface ? on - chip tem perature sensor ? bias voltages derived inside the chip ? temperature insensitive operation ? linear dimensions, inc. ? 445 east ohio street, chicago il 60611 usa ? tel 312. 404 . 9283 ? fax 312.321.1830 ? www.lineardimensions.com ?
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