3 mW, 100 kSPS, 14-Bit ADC in 6-Lead SOT-23

The AD79401 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 0 V 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.

PRODUCT HIGHLIGHTS

* First 14-bit ADC in a SOT-23 package.

* High throughput with low power consumption.

* Flexible power/serial clock speed management. The

conversion rate is determined by the serial clock, allowing

the conversion time to be reduced through the serial clock

speed increase. This allows the average power consumption

to be reduced when a power-down mode is used while not

converting. The part also features a shutdown mode to

maximize power efficiency at lower throughput rates.

Power consumption is 0.5 µA max when in shutdown.

* Reference derived from the power supply.

* No pipeline delay.

APPLICATIONS

* Battery-powered systems

Personal digital assistants

Medical instruments

Mobile communications

* Instrumentation and control systems

* Remote data acquisition systems

* Fast throughput rate: 100 kSPS

* Specified for VDD 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