16-bit ADC has auto channel selection
23 April 2003
Analogue, Mixed Signal, LSI
Linear Technology's LTC2436-1, a 16-bit No Latency Delta Sigma ADC, offers two fully differential input channels and a differential reference input. The ADC's low noise (800 nV per root-Hz) allows 16-bit performance with full-scale ranges from ±2,5 V down to ±50 mV without a PGA. The No Latency Delta Sigma architecture ensures single cycle digital filter settling even after a change in channels or input voltage step. Transparent auto calibration, on every conversion, ensures stable output codes with a total unadjusted error of 3LSBMAX independent of time, temperature, and supply. The LTC2436-1 can accept two differential inputs, which are converted alternately without being programmed. The full-scale input spans -0,5 VREF to 0,5 VREF where the reference voltage can be anywhere between 0,1 V and VCC for flexible ratiometric and remote sensing configurations. Since the noise performance is independent of VREF, input resolution increases by simply lowering the reference voltage. The LTC2436-1 communicates through a 3-wire digital interface, which is compatible with the SPI protocol. The device operates from a single 2,7 to 5,5 V supply and comes in 16-pin SSOP.
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