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DAC8741H Datasheet(PDF) 1 Page - Texas Instruments |
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DAC8741H Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page MUX HART PA/FF Transmit Modulator Receive Modulator DAC Buffer Carrier Detect Bandpass Filter Clock Generator Precision Oscillator Voltage Reference CLK_CFG1 CLKO CLK_CFG0 XEN X2 X1 REF REF_EN MOD_OUT MOD_INF MOD_IN IOVDD AVDD DGND GND BPFEN UART_RTS / SCLK UART_OUT / SDO DUPLEX / SDI UART_IN / CS CD / IRQ RST REG_CAP IF_SEL Copyright © 2017, Texas Instruments Incorporated Product Folder Order Now Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to change without notice. DAC8740H, DAC8741H, DAC8742H SBAS862 – JUNE 2017 DAC874xH, HART and FOUNDATION Fieldbus / PROFIBUS PA Modems 1 1 Features 1 • HART-Compliant Physical Layer Modem – 1200/2200 Hz HART FSK Sinusoids – Register Programmable Amplitude of TX Signals (DAC8741H / DAC8742H only) – Integrated RX Demodulator and Band-Pass Filter with Minimal External Components • Foundation Fieldbus Compliant H1 Controller and Medium Attachment Unit (MAU) – 31.25 kbit/s Communication Based on Manchester Coded Bus Powered (MBP) – Integrated Manchester Encoder and Decoder – Compliant with PROFIBUS PA • Low Quiescent Current: 200 uA Max • Integrated 1.5 V Reference • Flexible Clocking Options – External Crystal Oscillator – External CMOS Clock • Digital Interface – DAC8740H: UART – DAC8741H: SPI – DAC8742H: UART and SPI • Reliability: CRC Bit Error Checking, Watchdog Timer (DAC8741H and DAC8742H only) • Wide Operating Temperature: –55°C to 125°C • 4 mm x 4 mm QFN and 5 mm x 5 mm TQFP Packages 2 Applications • Industrial Process Control and Automation • PLC or DCS I/O Modules • Field and Sensor Transmitters 3 Description The DAC8740H, DAC8741H, and DAC8742H are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compliant low power modems designed for industrial process control and industrial automation applications. In HART mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex HART physical layer modems, in either slave or master configurations with minimal external components for filtering. In FOUNDATION Fieldbus mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex FOUNDATION Fieldbus compliant H1 Controllers and MAUs. The HART, FOUNDATION Fieldbus, or PROFIBUS PA, data stream can be transferred from the microcontroller through either a UART interface or an integrated FIFO accessed by a SPI interface. The SPI interface includes an SDO pin for daisy-chain support, various interrupts, and other extended features. The devices operate from a supply of 2.7V to 5.5V while consuming only 200 uA, making them an excellent choice for loop-powered or 2-wire applications. They operate from –55°C to 125°C and are available in 24-lead VQFN and 32-lead TQFP packages. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) DAC8740H VQFN (24) 4 mm × 4 mm DAC8741H VQFN (24) 4 mm × 4 mm DAC8742H TQFP (32) 5 mm × 5 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic |
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