MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU

The ADuC831 is a fully integrated 247 kSPS data acquisition system incorporating a high performance self-calibrating multi-channel 12-bit ADC, dual 12-bit DACs, and programmable 8-bit MCU on a single chip.

The microcontroller core is an 8052, and therefore 8051-instruction-set compatible with 12 core clock periods per machine cycle. 62 kBytes of nonvolatile Flash/EE program memory are provided on-chip. Four kBytes of nonvolatile Flash/EE data memory, 256 bytes RAM and 2 kBytes of extended RAM are also integrated on-chip.

The ADuC831 also incorporates additional analog functionality with two 12-bit DACs, power supply monitor, and a band gap reference. On-chip digital peripherals include two 16-bit Σ-∆ DACs, dual output 16-bit PWM, watchdog timer, time interval counter, three timers/counters, Timer 3 for baud rate generation and serial I/O ports (I2C, SPI and UART).

On-chip factory firmware supports in-circuit serial download and debug modes (via UART), as well as single-pin emulation mode via the EA pin. The ADuC831 is supported by QuickStart™ and QuickStart Plus development systems featuring low cost software and hardware development tools.

The part is specified for 3 V and 5 V operation over the extended industrial temperature range, and is available in a 52-lead plastic quad flatpack package and in a 56-lead chip scale package.

Applications

* Optical networking—laser power control

* Base station systems

* Precision instrumentation, smart sensors

* Transient capture systems

* DAS and communications systems

* ANALOG I/O

* 8-channel, 247 kSPS 12-bit ADC

DC performance: ±1 LSB INL

AC performance: 71 dB SNR

* DMA controller for high speed ADC-to-RAM capture

* 2 12-Bit (monotonic) voltage output DACs

* Dual output PWM/Σ-Δ DACs

* On-chip temperature sensor function ±3C

* On-chip voltage reference

* Memory

* 62 kBytes on-chip Flash/EE program memory

* 4 kBytes on-chip Flash/EE data memory

* Flash/EE, 100 yr retention, 100 kCycles endurance

* 2304 bytes on-chip data RAM

* 8051 based core

* 8051 compatible instruction set (16 MHz max)

* 12 interrupt sources, 2 priority levels

* Dual data pointer

* Extended 11-bit stack pointer

* See data sheet for additional features