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The AD7276/AD7277/AD7278 are 12-bit, 10-bit and 8bit, high speed, low power, successive-approximation ADCs respectively. The parts operate from a single 2.35V to 3.6 V power supply and feature throughput rates up to 3 MSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier which can handle input frequencies in excess of TBD MHz.
The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipeline delays associated with the part.
The AD7276/AD7277/AD7278 use advanced design techniques to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus the analog input range for the part is 0 to VDD. The conversion rate is determined by the SCLK.
AD7276 Maximum Ratings
VDD to GND...................................... -0.3 V to TBD V Analog Input Voltage to GND..... 0.3 V to VDD+ 0.3 V Digital Input Voltage to GND.............. 0.3 V to TBD V Digital Output Voltage to GND... 0.3 V to VDD+ 0.3 V Input Current to Any Pin Except Supplies2........±10 mA
Operating Temperature Range Commercial (B Grade)...................... 40°C to +85°C Storage Temperature Range...........65°C to +150°C Junction Temperature.........................................150°C
Lead Temperature Soldering Reflow (10- 30 sec) ................................... +TBD°C ESD................................................................. TBD KV
AD7276 Features
Fast Throughput Rate: 3MSPS Specified for VDD of 2.35V to 3.6V Low Power: 13.5 mW max at 3MSPS with 3V Supplies TBD mW typ at 1.5MSPS with 3V Supplies Wide Input Bandwidth: 70dB SNR at 1MHz Input Frequency Flexible Power/Serial Clock Speed Management No Pipeline Delays High Speed Serial Interface SPITM QSPITM MICROWIRETM DSP Compatible Power Down Mode: 1µA max 6-Lead TSOT Package 8-lead MSOP Package AD7476 and AD7476A pin compatible
AD7276 Typical Application
Battery-Powered Systems Personal Digital Assistants Medical Instruments Mobile Communications Instrumentation and Control Systems Data Acquisition Systems High-Speed Modems Optical Sensors