ADC12762 Datasheet | National Semiconductor

Description Using an innovative multistep conversion technique, the 12-bit ADC12762 CMOS analog-to-digital converter digitizes signals at a 1.4 MHz sampling rate while consuming a maximum of only 300 m W on a single +5V supply. The ADC12762 performs a 12-bit conversion in three lower-resolution “flash” conversions, yielding a fast A/D without the cost and power dissipation associated with true flash approaches. The analog input voltage to the ADC12762 is tracked and held by an internal sampling circuit, allowing high frequency input signals to be accurately digitized without the need for an external sample-and-hold circuit. The ADC12762 features two sample-and-hold/flash parator sections which allow the converter to acquire one sample while converting the previous. This pipelining technique increases conversion speed without sacrificing performance. The multiplexer output is available to the user in order to perform additional external signal processing before the signal is digitized. When the converter is not digitizing signals, it can be placed in the Standby mode; typical power consumption in this mode is 250 µW. Features n Built-in sample-and-hold n Single +5V supply n Single channel or 2 channel multiplexer operation Key Specifications n n n n n Sampling rate Conversion time SNR, f IN = 100 k Hz Power dissipation (fs = 1.4 MHz) No missing codes over temperature 1.4 MHz (min) 593 ns (typ) 67.5 d B (min) 300 m W (max) Guaranteed Applications n n n n n n CCD image scanners Digital signal processor front ends Instrumentation Disk drives Mobile telemunications Waveform digitizers ADC12762 Block Diagram DS012811-1 Ordering Information mercial (0˚C ≤ TA ≤ +70˚C) ADC12762CCV ADC12062EVAL Package V44 Plastic Leaded Chip Carrier Evaluation Board TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS012811 .national. Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are...