AS1520

Description

The AS1520/AS1521 are low-power, 8/4-channel, 400/300ksps, 10-bit analog-to-digital (A/D) converters specifically designed to operate with single-supply devices. Superior AC characteristics, very low power consumption, and highly-reliable packaging make these ultrasmall devices perfect for battery-powered remote-sensor and data-acquisition devices.

The successive-approximation register (SAR), highspeed sampling, high-bandwidth track/hold circuitry, and multi-mode operation combine to make these devices highly-flexible and configurable.

Both devices require low supply current (2.8mA @400ksps, AS1520; 2.2mA @ 300ksps, AS1521) and feature a reduced-power mode and a power-down mode to lower power consumption at slower throughput rates.

The devices operate from a single supply (+4.5 to +5.5V, AS1520; +2.7 to +3.6V, AS1521). Both devices contain an internal 2.5V reference, an integrated reference buffer, and feature support for an external reference (1V to VDD)

Data accesses are made via the high-speed, 4-wire, SPI, QSPI-, and Microwire-compatible serial interface.

The devices are available in a 20-pin TSSOP package.

Key Features

• Single-Supply Operation:
  • +4.5 to +5.5V (AS1520)
  • +2.7 to +3.6V (AS1521)
• Sampling Rate:
  • 400ksps (AS1520)
  • 300ksps (AS1521)
• Software-Configurable Analog Input Types:
  • 8-Channel Single-Ended
  • 8-Channel Pseudo Differential referenced to COM
  • 4-Channel Pseudo Differential
  • 4-Channel Fully Differential
• Software-Configurable Input Range
• Internal +2.5V Reference
• Low-Current Operation:
  • 2.8mA @ 400ksps (AS1520)
  • 2.2mA @ 300ksps (AS1521)
  • 0.4mA in Reduced-Power Mode
  • 0.5µA in Full Power-Down Mode
• SPI/QSPI/Microwire/TMS320-Compatible
• 20-pin TSSOP Package

Applications

The devices are ideal for remote sensors, data-acquisition and data-logging devices, pen-digitizers, process control, or any other space-limited A/D application with low power-consumption requirements.

Block Diagram