ADUC834BSZ

ADuC834 is a complete smart transducer front end, integrating two high resolution Ʃ-Δ ADCs, an 8bit MCU and program/data Flash/EE memory on a single chip. The two independent ADCs (primary and auxiliary) include a temperature sensor and a PGA (allowing direct measurement of low level signals). The ADC with on-chip digital filtering and programmable output data rates are intended for the measurement of wide dynamic range, low frequency signals, such as those in weigh scale, strain-gauge, pressure transducer, or temperature measurement applications. The device operates from a 32KHz crystal with an on-chip PLL generating a high frequency clock of 12.58MHz. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. Typical application includes intelligent sensors, weigh scales, portable instrumentation, battery powered systems, 4 to 20mA transmitters, data logging and precision system monitoring.

• 2 independent ADC (16bit, 24bit), 24bit no missing codes, offset drift 10nV/°C, gain drift 0.5ppm/°C
• 62Kbytes on-chip flash/EE program memory, 4Kbytes on-chip flash/EE data memory
• In-circuit serial download, high speed user download (5s) and 2304bytes on-chip data RAM
• 8051 compatible instruction set, 32KHz external crystal, 3x16bit timer/counter, 26 programmable I/O
• 11 interrupt sources, two priority levels
• On-chip peripherals: time interval counter (wake-up/RTC timer), UART, SPI® and I2C® serial I/O, WDT
• Internal power on reset circuit, on-chip temperature sensor, dual excitation current sources
• Specified for 3V and 5V operation
• Power of 2.3mA max at 3.6V (core CLK = 1.57MHz) normal, 20µA max with wake-up timer running
• 52 lead MQFP package, operating temperature range from -40°C to 125°C

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ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party