AS1545 A/D Converter IC

Description

The AS1545 is a dual, 12-bit, 6-channel, 1 Msps, high speed, successive approximation (SAR) analog-to-digital converters (ADCs). The AS1545 is designed to operate with a single +2.7V to +5.25V supply and a sampling rate of up to 1 Msps.

The device contains two ADCs, each preceded by a 6-channel multiplexer and a high-bandwidth track/hold amplifier. Data access is made via standard control inputs in support of wide range of microprocessors and DSPs.

The device requires very low supply-current at the 1Msps maximum sampling speed, and features flexible power-down modes to reduce power consumption at slower throughput rate.

The AS1545 contains an internal 2.5V reference and integrated reference buffer that can be over driven when an external reference is required.

Superior AC characteristics, low power consumption and highly reliable packaging makes the AS1545 perfect for portable battery-powered remote sensors and data-acquisition devices.

The AS1545 is available in a 32-lead TQFN package.

Key Features

• Sampling Rate: 1Msps per ADC
• Dual 12-bit serial interface
• Software Configurable Analog Input Types:
  • 12-Channel Single-Ended
  • 6-Channel Pseudo-Differential
  • 6-Channel Fully Differential
• Internal +2.5V Reference or External: 1V to VDD
• Rail to Rail Common Mode Input Range
• Low-Power Consumption
  • 15mW maximum at 1Msps with 2.7V supplies
  • 37mW maximum at 1Msps with 5.25V supplies
• Dual conversion with read at 20 MHz SCLK
• Single-Supply Operation: +2.7V to +5.25V
• Motor Control Registers: Difference of Inputs, Quadrature Signal Phases, Direction and Step Down Counter
• 32-lead TQFN Package

Applications

The device is ideal for motor control like encoder feed-back or current sense, motion control such as robotics, sonar, or for any other radio frequency identification.

Block diagram for AS1545 A/D Converter IC