Applications

• Data Acquisition Systems
• Core Cell for Instrumentation Applications
• Audio Sampling Applications
• Industrial Control Applications
• Servo Loops and Control Systems

Key Features

• Small Area < 0.828mm²
• Size x=862µm y=960µm
• Track and Hold Input Stage
• Rail to Rail Dynamic Range
• Single Ended (SE) and Fully Differential (FD) Input Stage
• Self Power Down Mode

Key Specification

• Resolution 12 Bit
• Maximum Sampling Rate 1.5MSample/sec
• Supply Range between 2.7 V and 3.6 V
• Wide Junction Temperature Range from -40 °C to +125 °C
• Negative Reference Voltage (VREFN) Range from 0.825V to 1.475V at 3.3V Supply
• Positive Reference Voltage (VREFP) Range from 1.825V to 2.475V at 3.3V Supply
• Reference Voltage Difference (VREFP-VREFN) must be greater than 1V at 3.3V Supply
• Negative and Positive Analog Input Voltage Range from 0V to 3.3V at 3.3V Supply
• Full Scale Range ±(VREFP-VREFN) at 3.3V Supply
• SE: Negative Analog Input Voltage must be set to (VREFP+VREFN)/2 at 3.3V Supply
• Total Power Consumption typical 8mW maximum 12mW

Description

The Macro Cell SCDAC12F.C35 is a 12-Bit SAR analog to digital converter. The architecture is based on a charge redistribution switched capacitor main-DAC for the MSBs and a resistor string sub-DAC for the LSBs.

The inherent track-and-hold operation of the input stage avoids the need for additional sample-and-hold stages. At the beginning of the tracking phase the whole main-DAC is recharged. This causes high input current peaks.

Two reference inputs VREFP and VREFN define the dynamic range of the input signal, which includes the supply voltage. The references are used to recharge the capacitors in the DAC. This causes current peaks on the reference lines.