AS1521 A/D Converter IC
10-Bit, 8-Channels, Low Power A/D Converter with 300ksps
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 ultra small 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.
- 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
- 20-pin TSSOP Package
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 for AS1521 A/D Converter IC
AS1521 10-Bit, 8-Channels ADC Block Diagram