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Texas Instruments DAC8741HRGER
- Part No.:
- DAC8741HRGER
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
DAC8741HRGER.pdf
- Description:
- DIGITAL TO ANALOG CONVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:3,901
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Product details
Overview
DAC8741HRGER from Texas Instruments is a HART® and FOUNDATION Fieldbus™/PROFIBUS PA dual-mode modem IC designed for industrial field transmitters and I/O modules. It integrates SPI digital interface, 1.5-V internal voltage reference, internal band-pass filter, 1200/2200-Hz FSK modulation, and 31.25-kbit/s Manchester encoding/decoding - enabling single-chip wired process automation communication in harsh environments.
For engineers reviewing the DAC8741HRGER datasheet, DAC8741HRGER pinout, DAC8741HRGER application, or DAC8741HRGER equivalent, this page delivers verified functional identity, SPI timing compliance (12.5 MHz), HART/FF/PA mode current consumption (≤250 µA), thermal performance (RθJA = 32.1°C/W), and real-world transmitter integration constraints - all critical for loop-powered device design and certification.
Technical Context
The DAC8741HRGER implements a fully integrated half-duplex physical layer for both HART (FSK) and FOUNDATION Fieldbus/PROFIBUS PA (Manchester) protocols. Its architecture includes independent transmit modulator and receive demodulator paths, programmable clocking (internal oscillator, external crystal, or CMOS input), and dual-reference support (1.5-V internal or 2.5-V external).
It features dedicated analog signal chains: MOD_IN/MOD_INF/MOD_OUT with configurable BPF_EN and REF_EN control, plus digital interface logic with SPI-specific pins (CS, SCLK, SDI, SDO) and interrupt-driven IRQ output. The device operates across –55°C to +125°C and supports power-down mode with ≤60 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| HART FSK Output | 1200 Hz mark / 2200 Hz space sinusoids, ±1% frequency error over –40°C to +105°C - ensures reliable HART master/slave interoperability. |
| FF/PA Bit Rate | 31.25 kbit/s Manchester, ±0.2% tolerance - meets IEC 61158-2 H1 physical layer specification for bus-powered devices. |
| Supply Current (HART TX) | 180 µA max at –40°C to +85°C with external clock - enables ultra-low-power loop-powered transmitter designs. |
| Internal Reference | 1.5 V ±20 mV, load regulation 1.3 V/mA - stable bias for internal analog blocks without external reference component. |
| SPI Interface Speed | Up to 12.5 MHz clock rate, 5 ns data setup/hold - supports high-throughput register access for real-time modem control. |
| Operating Temperature | –55°C to +125°C junction range - qualified for extended industrial and hazardous-area deployments. |
| Package | 24-pin VQFN (RGE), 4 mm × 4 mm, 0.5-mm pitch - compact footprint compatible with dense PCB layouts and automated assembly. |
Pinout & Package
Package: 24-pin VQFN (RGE), 4 mm × 4 mm, exposed thermal pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XEN | Digital input | Crystal oscillator enable: low = enable external crystal; high = disable crystal, use internal oscillator or CMOS clock. |
| CS | Digital input | SPI chip-select: active-low enables serial shift register; high places SDO in high-impedance state. |
| SCLK | Digital input | SPI clock input with Schmitt-trigger; supports up to 12.5 MHz - defines timing for SDI sampling and SDO output. |
| SDI | Digital input | SPI data input: 24-bit register loaded on falling edge of SCLK - used for configuration and command writes. |
| SDO | Digital output | SPI data output: daisy-chain capable, data valid on falling edge of SCLK - enables multi-device bus topology. |
| IRQ | Digital output | Configurable interrupt: edge/level sensitive, polarity programmable - signals carrier detect, FIFO threshold, or error events. |
| MOD_OUT | Analog output | Modem output: FSK sinusoid (HART) or Manchester stream (FF/PA); requires 5–22 nF parallel capacitance in HART mode. |
| REF_EN | Digital input | Reference enable: high activates internal 1.5-V reference; low disables it for external 2.5-V reference use. |
| BPF_EN | Digital input | Band-pass filter enable: high activates internal filter for HART/FF/PA receive path - eliminates need for external passive filter. |
Key Features
| Feature | Design Value |
|---|---|
| HART/FF/PA dual-mode operation | Single IC supports both 1200/2200-Hz FSK and 31.25-kbit/s Manchester protocols - reduces BOM count and qualification effort for multi-standard field devices. |
| SPI interface with daisy-chain SDO | Enables cascaded modem configurations without additional GPIOs - simplifies multi-channel transmitter designs. |
| Integrated 1.5-V reference with REF_EN control | Eliminates external reference IC and associated layout complexity while maintaining <±20 mV accuracy over temperature. |
| Internal band-pass filter (BPF_EN) | Reduces external component count by replacing discrete LC/RC filters - improves production yield and EMI robustness. |
| Low-power operation (≤250 µA) | Meets 4–20 mA loop power budget constraints in FF/PA mode - allows full protocol functionality within 3.5 mA total loop current. |
Applications
| Smart 4–20 mA Transmitters | PLC Analog I/O Modules |
|---|---|
Use Scenario: Two-wire field transmitter sending sensor data (e.g., pressure, temperature) over 4–20 mA loop with superimposed HART or FF communication. IC Role / Device Role / Timing Role: Physical layer modem handling FSK/Manchester modulation/demodulation, clock generation, and analog signal conditioning. Use Value: Enables simultaneous analog current transmission and digital diagnostics/control without external modems or discrete filters. |
Use Scenario: Rack-mounted PLC module providing HART/FF communication to multiple field devices via isolated backplane. IC Role / Device Role / Timing Role: Protocol-specific PHY layer translating microcontroller SPI commands into compliant bus waveforms and vice versa. Use Value: Delivers certified physical layer compliance while minimizing board area and thermal load in space-constrained I/O slots. |
| Fieldbus Power Supplies (MAUs) | Hazardous-Area Loop-Powered Devices |
Use Scenario: Foundation Fieldbus segment power supply integrating medium attachment unit (MAU) functionality for intrinsic safety barriers. IC Role / Device Role / Timing Role: MAU-compliant transceiver managing Manchester encoding/decoding, bus collision detection, and jabber inhibition. Use Value: Meets IEC 61158-2 Clause 7 requirements for MAU timing and signal integrity without external timing ICs. |
Use Scenario: Intrinsically safe temperature transmitter operating in Zone 0/1 environments with strict power and thermal limits. IC Role / Device Role / Timing Role: Low-quiescent-current modem enabling full HART/FF functionality within 3.5 mA loop budget and –55°C to +125°C range. Use Value: Eliminates need for external current-limiting circuitry or derating due to thermal constraints in explosion-proof enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar industrial fieldbus modem applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DAC8740HRGER | UART interface instead of SPI; no IRQ or watchdog timer; identical analog modem core and package. | Requires UART-capable MCU; lacks interrupt-driven status reporting and CRC-based reliability features of DAC8741HRGER. | Select DAC8740HRGER only when MCU lacks SPI peripheral but provides robust UART with hardware flow control. |
| AD5700-1ACPZ-RL7 | HART-only modem (no FF/PA support); 16-pin LFCSP; integrated 3.3-V regulator; no internal reference. | Limited to HART applications; requires external 2.5-V reference and external clock; higher supply current (350 µA typical). | Choose AD5700-1 only for cost-sensitive, HART-only designs where FF/PA compatibility is unnecessary and board space permits larger decoupling. |
Compared with DAC8740HRGER, DAC8741HRGER adds SPI flexibility and IRQ-driven event handling; compared with AD5700-1, it delivers dual-protocol support, lower power, and integrated reference - making it optimal for next-generation multi-standard field devices requiring minimal external components.
Availability
DAC8741HRGER is available at Aetrix Electronics and suitable for smart transmitter development, PLC I/O module production, and FOUNDATION Fieldbus MAU design requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial automation programs.
Supply support for DAC8741HRGER 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 leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The DAC874xH product line was engineered specifically for loop-powered industrial field devices requiring certified HART, FOUNDATION Fieldbus, and PROFIBUS PA physical layer compliance - emphasizing ultra-low power, integrated signal conditioning, and robust EMC performance.
FAQ
What communication protocols does the DAC8741HRGER support?
The DAC8741HRGER supports HART (1200/2200-Hz FSK), FOUNDATION Fieldbus H1, and PROFIBUS PA physical layers. It implements full Manchester encoding/decoding at 31.25 kbit/s for FF/PA and precise FSK modulation/demodulation for HART - all within a single IC. DAC8741HRGER does not support Modbus, CAN, or RS-485 protocols.
Does DAC8741HRGER require an external crystal oscillator?
No - DAC8741HRGER includes an internal 1.2288-MHz oscillator usable in all modes. An external crystal (X1/X2) or CMOS clock may be used instead via XEN and CLK_CFG pins, but is optional. DAC8741HRGER achieves full HART/FF timing compliance using its internal oscillator across –40°C to +105°C.
What is the function of the IRQ pin on DAC8741HRGER?
The IRQ pin on DAC8741HRGER is a programmable digital interrupt output that signals events including carrier detect (CD), FIFO threshold crossing, and modem errors. It supports edge- or level-sensitive triggering with configurable polarity via CONTROL register settings - enabling efficient polling-free firmware operation in DAC8741HRGER-based systems.
Can DAC8741HRGER operate with an external 2.5-V reference?
Yes - DAC8741HRGER accepts an external 2.5-V reference applied to the REF pin when REF_EN is held low. In this configuration, internal reference is disabled, and external reference must meet 2.375–2.625 V tolerance with ≤4.5 µA input current draw. DAC8741HRGER maintains full analog performance with either internal (1.5 V) or external (2.5 V) reference.
What is the maximum SPI clock frequency supported by DAC8741HRGER?
DAC8741HRGER supports SPI clock frequencies up to 12.5 MHz, with minimum SCLK cycle time of 80 ns and 5 ns data setup/hold requirements. This allows high-speed register access for real-time modem configuration and status polling. DAC8741HRGER SPI timing is fully specified in Section 7.6 of the SBAS856D datasheet.
DAC8741HRGER 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
DAC8741HRGER FAQ
1.How can I place an order for DAC8741HRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for DAC8741HRGER 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 DAC8741HRGER reliable?
The price and inventory of DAC8741HRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DAC8741HRGER is usually 5 days.
3.What payment methods are accepted for DAC8741HRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DAC8741HRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DAC8741HRGER?
DAC8741HRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DAC8741HRGER 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 DAC8741HRGER?
For technical support, including DAC8741HRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DAC8741HRGER requirements.
6.How does Aetrix verify that DAC8741HRGER is sourced from the original manufacturer or authorized distributors?
All DAC8741HRGER 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 DAC8741HRGER meets industry standards.
7.What is the process for return or replacement of DAC8741HRGER?
All DAC8741HRGER units undergo pre-shipment inspection (PSI). If there is an issue with DAC8741HRGER, 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 DAC8741HRGER part is unused and in its original packaging.
Return procedure for DAC8741HRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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