Datasheet AD7880 (Analog Devices)

a
LC2MOS Single +5 V Supply, Low Power, 12-Bit Sampling ADC AD7880 FEATURES FUNCTIONAL BLOCK DIAGRAM 12-Bit Monolithic A/D Converter 66 kHz Throughput Rate VDD 12
m
s Conversion Time 3
m
s On-Chip Track/Hold Amplifier R SAMPLING V COMPARATOR LOW POWER INA MODE Low Power + CONTROL Power Save Mode: 2 mW typ R CIRCUIT VINB – Normal Operation: 25 mW typ 70 dB SNR VREF 12-BIT DAC Fast Data Access Time: 57 ns AGND Small 24-Lead SOIC and 0.3" DIP Packages CS SAR + APPLICATIONS CLKIN COUNTER CONTROL Battery Powered Portable Systems CONVST LOGIC Digital Signal Processing RD THREE Speech Recognition and Synthesis BUSY STATE AD7880 BUFFERS High Speed Modems Control and Instrumentation DB11 DB0 DGND GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7880 is a high speed, low power, 12-bit A/D converter 1. Fast Conversion Time. which operates from a single +5 V supply. It consists of a 3 µs 12 µs conversion time and 3 µs acquisition time allow for track/hold amplifier, a 12 µs successive-approximation ADC, large input signal bandwidth. This performance is ideally versatile interface logic and a multiple-input-range circuit. The suited for applications in areas such as telecommunications, part also includes a power save feature. audio, sonar and radar signal processing. An internal resistor network allows the part to accept both uni- 2. Low Power Consumption. polar and bipolar input signals while operating from a single 2 mW power consumption in the power-down mode makes +5 V supply. Fast bus access times and standard control inputs the part ideally suited for portable, hand held, battery pow- ensure easy interfacing to modern microprocessors and digital ered applications. signal processors. 3. Multiple Input Ranges. The AD7880 features a total throughput time of 15 µs and can The part features three user-determined input ranges, 0 V to convert full power signals up to 33 kHz with a sampling fre- +5 V, 0 V to 10 V and ± 5 V. These unipolar and bipolar quency of 66 kHz. ranges are achieved with a 5 V only power supply. In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7880 is also fully specified for dynamic performance parameters including har- monic distortion and signal-to-noise ratio. The AD7880 is fabricated in Analog Devices’ Linear Compat- ible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin, 0.3 inch-wide, plastic or hermetic dual-in-line package (DIP) as well as a small 24-lead SOIC package. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
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