ADI AD7940BRMZ-REEL7

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 kSPS. 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 0V to VDD. The conversion rate is determined by the SCLK frequency. This part features a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once off conversion control.

• Fast throughput rate: 100 kSPS
• Specified for Vo of 2.5 V to 5.5 V
• Low power 4 mW typ at 100 kSPS with 3 V supplies, 17 mW typ at 100 kSPS with 5 V supplies
• Wide input bandwidth: 81 dB SINAD at 10 kHz input frequency
• Flexible power/serial clock speed management
• No pipeline delays
• High speed serial interface SPI/QSPI/MICROWIRE/DSP compatible
• Standby mode: 0.5 μA max
• 6-Lead SOT-23 and 8-Lead MSOP packages

• Battery-powered systems
• Personal digital assistants
• Medical instruments
• Mobile communications
• Instrumentation and control systems
• Remote data acquisition systems