AD1671JQ Datasheet

Analog to Digital Converters - ADC


The AD1671JQ is a monolithic 12-bit, 1.25 MSPS analog-todigital converter with an on-board, high performance sampleand-hold amplifier (SHA) and voltage reference. The AD1671JQ guarantees no missing codes over the full operating temperature range. The combination of a merged high speed bipolar/ CMOS process and a novel architecture results in a combination of speed and power consumption far superior to previously available hybrid implementations. Additionally, the greater reliability of monolithic construction offers improved system reliability and lower costs than hybrid designs. The fast settling input SHA is equally suited for both multiplexed systems that switch negative to positive full-scale voltage levels in successive channels and sampling inputs at frequencies up to and beyond the Nyquist rate. The AD1671JQ provides both reference output and reference input pins, allowing the on-board reference to serve as a system reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application. The AD1671JQ uses a subranging flash conversion technique, with digital error correction for possible errors introduced in the first part of the conversion cycle. An on-chip timing generator provides strobe pulses for each of the four internal flash cycles. A single ENCODE pulse is used to control the converter. The digital output data is presented in twos complement or offset binary output format. An out-of-range signal indicates an overflow condition. It can be used with the most significant bit to determine low or high overflow. AD1671JQ Features •Conversion Time: 800 ns•1.25 MHz Throughput Rate•Complete: On-Chip Sample-and-Hold Amplifier and Voltage Reference•Low Power Dissipation: 570 mW•No Missing Codes Guaranteed•Signal-to-Noise Plus Distortion Ratio fIN = 100 kHz: 70 dB•Pin Configurable Input Voltage Ranges•Twos Complement or Offset Binary Output Data•28-Pin DIP and 28-Pin Surface Mount Package•Out of Range Indicator


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