AD7940 Datasheet | Analog Devices

Features Fast throughput rate: 100 k SPS Specified for VDD of 2.5 V to 5.5 V Low power 4 m W typ at 100 k SPS with 3 V supplies 17 m W typ at 100 k SPS with 5 V supplies Wide input bandwidth: 81 d B SINAD at 10 k Hz input frequency Flexible power/serial clock speed management No pipeline delays High speed serial interface SPI®/QSPI™/MICROWIRE™/DSP patible Standby mode: 0.5 µA max 6-Lead SOT-23 and 8-Lead MSOP packages FUNCTIONAL BLOCK DIAGRAM T/H 14-BIT SUCCESSIVE APPROXIMATION ADC SCLK CONTROL LOGIC SDATA CS 03305-0-001 Figure 1. APPLICATIONS Battery-powered systems Personal digital assistants Medical instruments Mobile munications Instrumentation and control systems Remote data acquisition systems Table 1. 16-Bit and 14-Bit ADC (MSOP and SOT-23) Type 16-Bit True Differential 16-Bit Pseudo Differential 16-Bit Unipolar 14-Bit True Differential 14-Bit Pseudo Differential 14-Bit Unipolar 100 k SPS AD7684 AD7683 AD7680 250 k SPS AD7687 AD7685 AD7944 AD7942 AD7940 500 k SPS AD7688 AD7686 AD7947 AD7946 GENERAL DESCRIPTION The AD7940 is a 14-bit, fast, low power, successive approximation ADC. The part operates from a single 2.50 V to 5.5 V power supply and Features throughput rates up to 100 k SPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 7 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 pipelined delays associated with the part. The AD7940 uses advanced design techniques to achieve very low power dissipation at fast throughput rates. The reference for the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range for this part is 0 V to VDD. The conversion rate is determined by the SCLK...