ADC10464 Datasheet | National Semiconductor

Description Using an innovative, patented multistep- conversion technique, the 10-bit ADC10461, ADC10462, and ADC10464 CMOS analog-to-digital converters offer sub-microsecond conversion times yet dissipate a maximum of only 235 m W. The ADC10461, ADC10462, and ADC10464 perform a 10-bit conversion in two lower-resolution “flashes”, thus yielding a fast A/D without the cost, power dissipation, and other problems associated with true flash approaches. Dynamic performance (THD, S/N) is guaranteed. The ADC10461 is pin-patible with the ADC1061 but much faster, thus providing a convenient upgrade path for the ADC1061. The analog input voltage to the ADC10461, ADC10462, and ADC10464 is sampled and held by an internal sampling circuit. Input signals at frequencies from dc to over 200 k Hz can therefore be digitized accurately without the need for an external sample-and-hold circuit. The ADC10462 and ADC10464 include a “speed-up” pin. Connecting an external resistor between this pin and ground reduces the typical conversion time to as little as 350 ns with only a small increase in linearity error. For ease of interface to microprocessors, the ADC10461, ADC10462, and ADC10464 have been designed to appear as a memory location or I/O port without the need for external interface logic. Features n n n n n Built-in sample-and-hold Single +5V supply 1, 2, or 4-input multiplexer options No external clock required Speed adjust pin for faster conversions (ADC10462 and ADC10464) Key Specifications n n n n n Conversion time to 10 bits Sampling Rate Low power dissipation Total harmonic distortion (50 k Hz) No missing codes over temperature 600 ns typical 800 k Hz 235 m W (max) - 60 d B (max) Applications n n n n Digital signal processor front ends Instrumentation Disk drives Mobile telemunications Note: - U.S. Patent Number 4918449 Ordering Information Industrial Temp Range (- 40˚C ≤ TA ≤ +85˚C) ADC20461CIWM ADC20462CIWM ADC20464CIWM Package M20B Small Outline M24B Small Outline M28B Small...