1 Features

1• Industry's First SAR ADC with Nanowatt Power

Consumption:

– 234 μW at 1 MSPS with 1.8-V AVDD

– 690 μW at 1 MSPS with 3-V AVDD

– 69 μW at 100 kSPS with 3-V AVDD

– Less than 1 μW at 1 kSPS with 3-V AVDD

• Industry's Smallest SAR ADC:

– X2QFN-8 Package with 2.25-mm2 Footprint

• 1-MSPS Throughput with Zero Data Latency

• Wide Operating Range:

– AVDD: 1.65 V to 3.6 V

– DVDD: 1.65 V to 3.6 V (Independent of AVDD)

– Temperature Range: –40°C to 125°C

• Excellent Performance:

– 12-Bit Resolution with NMC

– ±1-LSB (Max) DNL and INL

– 70-dB SNR with 3-V AVDD

– –80-dB THD with 3-V AVDD

• Unipolar Input Range: 0 V to AVDD

• Integrated Offset Calibration

• SPI™-Compatible Serial Interface: 16 MHz

• JESD8-7A Compliant Digital I/O

2 Applications

• Low-Power Data Acquisition

• Battery-Powered Handheld Equipment

• Level Sensors

• Ultrasonic Flow Meters

• Motor Control

• Wearable Fitness

• Portable Medical Equipment

• Hard Drives

• Glucose Meters

3 Description

The ADS7042 is a 12-bit, 1-MSPS, analog-to-digital

converter (ADC). The device supports a wide analog

input voltage range (1.65 V to 3.6 V) and includes a

capacitor-based, successive-approximation register

(SAR) ADC with an inherent sample-and-hold circuit.

The SPI-compatible serial interface is controlled by

the CS and SCLK signals. The input signal is

sampled with the CS falling edge and SCLK is used

for conversion and serial data output. The device

supports a wide digital supply range (1.65 V to 3.6 V),

enabling direct interface to a variety of host

controllers. The ADS7042 complies with the JESD8-

7A standard for a normal DVDD range (1.65 V to

1.95 V).

The ADS7042 is available in 8-pin, miniature, leaded,

and X2QFN packages and is specified for operation

from –40°C to 125°C. Miniature form-factor and

extremely low-power consumption make this device

suitable for space-constrained, battery-powered

applications.