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Texas Instruments DAC8741HRGET
- Part No.:
- DAC8741HRGET
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
DAC8741HRGET.pdf
- Description:
- IC INTERFACE SPECIALIZED 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
DAC8741HRGET from Texas Instruments is a HART® and FOUNDATION Fieldbus™/PROFIBUS PA dual-mode modem IC for industrial process automation, featuring SPI digital interface, integrated 1.5-V reference, internal band-pass filter, and 1200/2200-Hz FSK modulation in HART mode with 450–480 mVPP output. It operates across –40°C to +105°C and supports field transmitter integration.
For engineers reviewing the DAC8741HRGET datasheet, DAC8741HRGET pinout, DAC8741HRGET application, or DAC8741HRGET equivalent, key selection considerations include its SPI-only interface (vs UART in DAC8740H), register-programmable TX amplitude, CRC error checking, watchdog timer, and compatibility with 31.25 kbit/s Manchester-coded bus-powered systems.
Technical Context
The DAC8741HRGET implements a fully integrated half-duplex physical layer modem supporting both HART FSK (1200 Hz mark / 2200 Hz space) and FOUNDATION Fieldbus/PROFIBUS PA Manchester encoding at 31.25 kbit/s. Its architecture includes dedicated transmit modulator, receive demodulator, band-pass filter, carrier detect logic, and precision oscillator circuitry.
It features dual-clocking flexibility-internal 1.2288-MHz oscillator, external crystal (X1/X2), or CMOS clock input-and supports programmable reference enable (REF_EN), filter enable (BPF_EN), and interrupt-driven operation via IRQ pin. The SPI interface operates up to 12.5 MHz with daisy-chain SDO support and configurable interrupts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| HART Output Amplitude | 450–480 mVPP into 160-Ω AC-coupled load - ensures reliable signal integrity over long industrial wiring. |
| Reference Voltage | 1.47–1.53 V internal reference - stable voltage source for analog signal conditioning without external components. |
| Supply Current (HART Modulator) | 160–180 µA typical at –40°C to +85°C - enables ultra-low-power field device operation. |
| FF/PA Bit Rate | 31.1875–31.3125 kbit/s - meets IEC 61158-2 H1 specification for bus-powered devices. |
| SPI Clock Frequency | Up to 12.5 MHz - supports high-throughput configuration and data transfer with microcontrollers. |
| Operating Temperature | –40°C to +105°C - qualified for harsh industrial environments including process transmitters and PLC I/O modules. |
| ESD Rating (HBM) | ±8000 V - robust protection against handling and system-level electrostatic discharge events. |
Pinout & Package
Package: 24-pin VQFN (RGE), 4 mm × 4 mm, thermally enhanced with exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 XEN | Digital input | Crystal oscillator enable - low enables external crystal; high selects internal oscillator or CMOS clock. |
| 2 CLKO | Digital output | Configurable clock output - provides synchronized timing for external logic or ADCs. |
| 3 CLK_CFG0 / 4 CLK_CFG1 | Digital inputs | Two-bit clock configuration - selects internal/external clock source and output mode. |
| 5 RST | Digital input | Active-low reset - places device in power-down and clears internal state on falling edge. |
| 6 IRQ | Digital output | Programmable interrupt - signals modem events (carrier detect, FIFO threshold, errors) with polarity/edge control. |
| 7 CS | Digital input | SPI chip select - enables serial communication when low; disables SDO when high. |
| 8 SCLK | Digital input | SPI clock input - accepts up to 12.5 MHz with Schmitt-trigger input for noise immunity. |
| 9 SDI | Digital input | SPI data input - latches 24-bit commands on falling SCLK edge; Schmitt-triggered. |
| 10 SDO | Digital output | SPI data output - supports daisy-chaining multiple DAC8741H devices on shared bus. |
| 11 IOVDD | Supply | Digital interface supply - sets logic thresholds (1.71–5.5 V); independent from AVDD. |
| 12, 22 GND | Supply | Digital ground - reference for all digital I/O; separate from analog ground (pin 19). |
| 13 REG_CAP | Analog output | Internal regulator capacitor node - requires 1-µF ceramic capacitor to stabilize LDO output. |
| 14 MOD_OUT | Analog output | Modem output - delivers HART FSK or FF/PA Manchester signal; needs 5–22 nF (HART) or 0–100 pF (FF/PA) load capacitance. |
| 15 REF | Analog I/O | Reference voltage node - outputs 1.5 V when REF_EN = high; accepts 2.375–2.625 V external reference when disabled. |
| 16 MOD_IN | Analog input | Modem input - receives HART FSK or FF/PA Manchester signal; bypassed if external filter used. |
| 17 MOD_INF | Analog input | Internal filter feedback - connects to 680-pF (HART) or 120-pF (FF/PA) capacitor for BPF tuning. |
| 18 AVDD | Supply | Analog power supply - powers analog blocks (2.7–5.5 V); decoupling required near pin. |
| 19 GND | Supply | Analog ground - reference for AVDD and analog signal paths; must be star-connected to minimize noise. |
| 20 X2 / 21 X1 | Analog inputs | Crystal connections - drive 3.6864-MHz (HART) or 4-MHz (FF/PA) fundamental-mode crystal. |
| 23 REF_EN | Digital input | Reference enable - high enables internal 1.5-V reference; low disables it for external reference use. |
| 24 BPF_EN | Digital input | Band-pass filter enable - high activates internal filter; low disables for external filter implementation. |
Key Features
| Feature | Design Value |
|---|---|
| HART-compliant physical layer | Meets HART Physical Layer Specification v7.5 with 1200/2200-Hz sinusoidal FSK generation and detection. |
| FOUNDATION Fieldbus H1 MAU | Fully compliant with IEC 61158-2 for bus-powered H1 devices, including Manchester encode/decode and jabber inhibition. |
| Register-programmable TX amplitude | Adjustable output level in HART mode - enables calibration to meet loop-powered transmitter compliance (e.g., 4–20 mA + HART). |
| CRC bit error checking & watchdog | Hardware CRC validation on SPI transfers and configurable watchdog timer - improves firmware reliability in safety-critical systems. |
| Flexible clock architecture | Supports internal oscillator, external crystal (X1/X2), or CMOS clock - simplifies BOM and layout across diverse fieldbus implementations. |
Applications
| Smart Field Transmitter | PLC Analog I/O Module |
|---|---|
|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with HART diagnostics and remote configuration. IC Role / Device Role / Timing Role: Physical layer modem handling bidirectional HART communication while coexisting with analog current loop. Use Value: Enables full HART v7.5 functionality with <180 µA quiescent current, eliminating need for external modulator/demodulator ICs. |
Use Scenario: Distributed control system (DCS) analog input module receiving sensor data and supporting HART device management. IC Role / Device Role / Timing Role: Dual-role modem providing HART master capability and FOUNDATION Fieldbus slave interface on same hardware platform. Use Value: Reduces component count by integrating both protocols in one IC, simplifying certification for multi-protocol I/O cards. |
| Process Analyzer Interface | Industrial Safety Loop Monitor |
|
Use Scenario: Gas analyzer with intrinsic safety barriers requiring low-power, isolated HART communication. IC Role / Device Role / Timing Role: Isolated-side modem interfacing to microcontroller via SPI, managing carrier detect and modulation timing. Use Value: Internal 1.5-V reference and low supply current allow operation directly from isolated DC-DC converter without additional regulators. |
Use Scenario: SIL-2 certified safety instrumented system (SIS) monitoring loop integrity and detecting HART communication faults. IC Role / Device Role / Timing Role: Fault-tolerant modem with CRC-checked SPI interface and watchdog timer for diagnostic coverage. Use Value: Hardware-level CRC and watchdog support safe failure modes per IEC 61508, reducing software verification burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-mode fieldbus modem applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DAC8740HRGET | UART interface instead of SPI; no CRC or watchdog timer; identical analog modem performance and pinout. | Preferred for legacy microcontrollers lacking SPI peripherals or requiring simpler UART-based firmware. | Select DAC8740HRGET only when UART-native host MCU is used and advanced diagnostics are not required. |
| AD5700-1ACPZ-RL7 | HART-only modem (no FOUNDATION Fieldbus/PROFIBUS PA support); 16-pin LFCSP package; higher 300 µA typical supply current. | Used in cost-sensitive, HART-only transmitters where FF/PA compatibility is unnecessary. | Choose AD5700-1 when protocol scope is limited to HART and smaller footprint is prioritized over dual-protocol capability. |
Compared with DAC8740HRGET and AD5700-1ACPZ-RL7, the DAC8741HRGET uniquely combines SPI interface, CRC+watchdog reliability features, and dual HART/FF-PA protocol support in a single 4-mm QFN package - making it optimal for next-generation multi-protocol industrial I/O designs.
Availability
DAC8741HRGET is available at Aetrix Electronics and suitable for smart field transmitters, PLC analog I/O modules, process analyzers, and safety loop monitors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DAC8741HRGET includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The DAC874xH product line was designed specifically for industrial process automation, delivering integrated HART and FOUNDATION Fieldbus/PROFIBUS PA physical layer functionality in a single low-power IC to reduce system complexity and certification effort.
FAQ
What communication protocols does the DAC8741HRGET support?
The DAC8741HRGET supports HART FSK (1200/2200 Hz) and FOUNDATION Fieldbus/PROFIBUS PA Manchester-encoded communication at 31.25 kbit/s. It operates as a physical layer modem in both protocols, with full compliance to HART Physical Layer Specification v7.5 and IEC 61158-2 for H1 bus-powered devices. The DAC8741HRGET does not support other protocols such as CAN, RS-485, or Modbus RTU.
Does the DAC8741HRGET require an external crystal oscillator?
The DAC8741HRGET supports three clock sources: internal 1.2288-MHz oscillator, external crystal (via X1/X2 pins), or external CMOS clock. An external crystal is optional - it is required only when using crystal-based timing; otherwise, the internal oscillator or CMOS clock suffices. The DAC8741HRGET includes CLK_CFG0/CLK_CFG1 pins to configure the selected source, and CLKO pin can output the chosen clock.
How does the DAC8741HRGET handle reference voltage generation?
The DAC8741HRGET integrates a 1.5-V precision internal reference (1.47–1.53 V, ±2% over temperature), enabled via the REF_EN pin. When REF_EN is high, the REF pin outputs this voltage; when low, REF becomes an input accepting 2.375–2.625 V external reference. The internal reference eliminates need for external voltage references in most HART/FF designs, and load regulation is specified at 1.3 V/mA.
What is the function of the IRQ pin on the DAC8741HRGET?
The IRQ pin on the DAC8741HRGET is a programmable digital interrupt output that signals modem events including carrier detect (CD), FIFO threshold crossing, CRC errors, and watchdog timeout. Its polarity (active-high/low) and trigger type (edge/level) are configured via CONTROL register bits. This allows the host MCU to respond asynchronously to critical modem states without polling, improving real-time responsiveness in the DAC8741HRGET-based system.
Can the DAC8741HRGET operate in both HART and FOUNDATION Fieldbus modes simultaneously?
No, the DAC8741HRGET operates in either HART mode or FOUNDATION Fieldbus/PROFIBUS PA mode - not simultaneously. Mode selection is controlled by firmware configuration of internal registers; the device must be initialized for one protocol before communication begins. However, the same DAC8741HRGET hardware can be reconfigured in-system to switch between protocols, enabling flexible multi-standard field device deployment.
DAC8741HRGET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- HART Modem
- Interface:
- SPI
- Voltage - Supply:
- 1.71V ~ 5.5V, 2.7V ~ 5.5V
- Supplier Device Package:
- 24-VQFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
DAC8741HRGET FAQ
1.How can I place an order for DAC8741HRGET through Aetrix?
Please submit a Request for Quotation (RFQ) for DAC8741HRGET on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DAC8741HRGET reliable?
The price and inventory of DAC8741HRGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DAC8741HRGET is usually 5 days.
3.What payment methods are accepted for DAC8741HRGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DAC8741HRGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DAC8741HRGET?
DAC8741HRGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DAC8741HRGET order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DAC8741HRGET?
For technical support, including DAC8741HRGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DAC8741HRGET requirements.
6.How does Aetrix verify that DAC8741HRGET is sourced from the original manufacturer or authorized distributors?
All DAC8741HRGET products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DAC8741HRGET meets industry standards.
7.What is the process for return or replacement of DAC8741HRGET?
All DAC8741HRGET units undergo pre-shipment inspection (PSI). If there is an issue with DAC8741HRGET, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DAC8741HRGET part is unused and in its original packaging.
Return procedure for DAC8741HRGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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