1 Features
1• Industry's First SAR ADC with Nanowatt Power
Consumption:
– 171 μW at 1 MSPS with 1.8-V AVDD
– 555 μW at 1 MSPS with 3-V AVDD
– 56 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:
– 8-Bit Resolution with NMC
– ±0.5-LSB (Max) INL, ±0.4-LSB (Max) DNL
– 49 dB SNR
– –70-dB THD
• Unipolar Input Range: 0 V to AVDD
• Integrated Offset Calibration
• SPI™-Compatible Serial Interface: 12 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 ADS7040 is a 8-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 ADS7040 complies with the JESD8-
7A standard for a normal DVDD range (1.65 V to
1.95 V).
The ADS7040 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.