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Analog Devices Inc. LTC2751ACUHF-16#PBF
- Part No.:
- LTC2751ACUHF-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2751ACUHF-16#PBF.pdf
- Description:
- IC DAC 16BIT A-OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,244
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Product details
Overview
LTC2751ACUHF-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit parallel-input, current-output multiplying DAC with software-selectable output ranges. It delivers ±1 LSB INL and DNL over temperature, operates from a single 2.7V–5.5V supply, supports six programmable spans (e.g., ±10V, 0V–10V), and features bidirectional readback of data and span registers. It is used in high-accuracy industrial voltage control systems requiring stable zero-scale settling and low glitch impulse.
For engineers reviewing the LTC2751ACUHF-16#PBF datasheet, LTC2751ACUHF-16#PBF pinout, LTC2751ACUHF-16#PBF application, or LTC2751ACUHF-16#PBF equivalent, key selection criteria include guaranteed monotonicity over temperature, 2 µs settling time to ±1 LSB, ±15V reference input tolerance, 1 nV·s glitch impulse, and SoftSpan™ range configuration via S0–S2 pins or hardware strapping.
Technical Context
The LTC2751ACUHF-16#PBF implements a proprietary SoftSpan™ architecture using switched-resistor networks (R1/R2, ROFS, RVOS, RFB) to configure six output ranges without external component changes. Its dual-register interface-separate 16-bit data and 3-bit span registers-enables simultaneous update of code and range for glitch-free transitions between spans like ±5V and 0V–10V.
It uses a current-output topology with IOUT1/IOUT2 differential outputs, requiring an external I/V converter (e.g., LT1469). The MSPAN pin selects between full software-controlled SoftSpan mode (MSPAN = GND) and fixed-range manual mode (MSPAN = VDD), while CLR provides asynchronous zero-scale reset independent of span configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - defines 65,536 discrete output steps across any selected span |
| INL / DNL | ±1 LSB max over temperature - ensures monotonicity and end-point accuracy without calibration |
| Settling Time | 2 µs to ±1 LSB (0V→10V step) - enables high-speed closed-loop control in ATE and data acquisition |
| Glitch Impulse | 1 nV·s - minimizes transient injection during code transitions, critical for precision analog output stages |
| Reference Input Range | ±15 V - supports wide-range references (e.g., ±10V, ±5V) without external level-shifting circuitry |
| Supply Current | 1 µA max - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Output Ranges | Six programmable: unipolar (0V–5V, 0V–10V); bipolar (±2.5V, ±5V, ±10V, –2.5V–7.5V) |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN with exposed pad (Pin 39 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D15–D0 | Parallel data I/O bus | 16-bit bidirectional interface for loading DAC code and reading back input/DAC register contents |
| S2–S0 | Span select I/O | 3-bit port to program or read back active output range (e.g., 011 = ±10V); functional only when D/S = HIGH |
| WR | Active-low write strobe | Copies data/span bits from I/O bus into corresponding input register on rising edge |
| UPD | Update and register select | Rising edge copies input register → DAC register; when READ = HIGH, selects input vs DAC register for readback |
| READ | Read enable | Activates output drivers on D15–D0 or S2–S0 to reflect selected register contents |
| CLR | Asynchronous clear | Forces DAC output to 0V code in current span regardless of register state; no PCB layout dependency |
| MSPAN | Span configuration mode | GND = SoftSpan (full software control); VDD = manual span (pin-strapped fixed range at power-up) |
| IOUT1 / IOUT2 | Differential current outputs | IOUT1 sources current proportional to code; IOUT2 is complement; both require external I/V op amp (e.g., LT1469) |
| REF / RIN / RCOM / ROFS / RFB / RVOS | Analog reference & feedback network | Interface points for external precision op amp and resistor network defining gain, offset, and bipolar translation |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ range selection | Enables runtime switching among six calibrated output spans without changing external components or firmware calibration tables |
| Double-buffered data & span registers | Allows atomic update of both code and range-eliminates intermediate invalid voltages during span transitions (e.g., ±5V → 0V–10V) |
| Bidirectional register readback | Verifies written DAC code and span configuration before update, reducing system-level validation overhead in safety-critical applications |
| Asynchronous zero-scale CLR | Resets output to 0V in any active span within nanoseconds-no dependency on clock timing or register state |
| Power-on reset to 0V | Guarantees known initial output state at startup, simplifying system initialization and fault recovery sequences |
Applications
| Industrial Process Control | Automatic Test Equipment (ATE) |
|---|---|
Use Scenario: Precise voltage setpoint generation for PID-controlled temperature chambers and pressure regulators. IC Role / Device Role / Timing Role: 16-bit current-output DAC providing calibrated analog command signals to power amplifiers driving heaters/valves. Use Value: ±1 LSB INL ensures <0.0015% full-scale error across 0°C–70°C, eliminating need for per-unit calibration in production test fixtures. |
Use Scenario: Stimulus generation for parametric testing of ADCs, amplifiers, and mixed-signal ICs. IC Role / Device Role / Timing Role: High-speed, low-glitch DAC delivering precise DC and swept-voltage waveforms to device under test (DUT) inputs. Use Value: 2 µs settling + 1 nV·s glitch impulse enables accurate measurement of DUT settling behavior without DAC-induced artifacts. |
| Data Acquisition Calibration | Medical Instrumentation |
Use Scenario: Offset/gain trim in high-resolution medical-grade data loggers and patient monitors. IC Role / Device Role / Timing Role: Programmable reference voltage generator for sensor signal conditioning front-ends. Use Value: Six selectable spans (e.g., ±2.5V for EEG, 0V–5V for ECG) allow one BOM item to support multiple sensor types and gain stages. |
Use Scenario: Analog output for infusion pump motor control and diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Safety-critical voltage reference source for isolated motor driver feedback loops and X-ray detector biasing. Use Value: Asynchronous CLR and power-on reset guarantee fail-safe 0V output during brownout or reset events-meeting IEC 62304 Class C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit current-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5696RBCPZ-RL7 | Voltage-output (not current-output); integrated internal reference; SPI interface (not parallel); 4-channel; ±4 LSB INL | Requires no external op amp but lacks SoftSpan range flexibility and parallel throughput; better for space-constrained multi-channel systems | Select if board area is constrained and external reference/op amp integration is preferred over range agility |
| MAX5717ETE+ | Current-output; 16-bit; SPI interface; ±2 LSB INL; no built-in span selection-requires external logic or FPGA for range switching | Lower cost and smaller 16-pin TQFN package, but adds design complexity for multi-span operation and lacks readback capability | Select for cost-sensitive, single-span applications where SPI fits existing controller architecture and external span logic is acceptable |
Compared with AD5696RBCPZ-RL7 and MAX5717ETE+, the LTC2751ACUHF-16#PBF uniquely combines parallel interface speed, on-chip SoftSpan™ range configurability, and guaranteed ±1 LSB linearity-making it optimal for high-accuracy, multi-span industrial control where deterministic timing and minimal external components are critical.
Availability
LTC2751ACUHF-16#PBF is available at Aetrix Electronics and suitable for industrial process control, automatic test equipment, and precision data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC2751ACUHF-16#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2751 family was designed specifically for precision industrial control and instrumentation applications demanding software-configurable voltage ranges, guaranteed monotonicity, and minimal system-level calibration effort.
FAQ
What output voltage ranges does the LTC2751ACUHF-16#PBF support?
The LTC2751ACUHF-16#PBF supports six programmable output ranges: two unipolar (0V to 5V, 0V to 10V) and four bipolar (±2.5V, ±5V, ±10V, –2.5V to 7.5V). These are selected via S0–S2 pins or configured permanently using MSPAN pin strapping. Range selection is fully compatible with the LTC2751ACUHF-16#PBF's internal SoftSpan™ architecture and requires no external resistor changes.
Does the LTC2751ACUHF-16#PBF require an external op amp?
Yes, the LTC2751ACUHF-16#PBF is a current-output DAC and requires an external I/V conversion op amp (e.g., LT1469) connected to IOUT1, RFB, and REF pins. Its design assumes use of a precision op amp with low offset and drift to preserve the ±1 LSB INL specification. The LTC2751ACUHF-16#PBF datasheet provides recommended compensation networks and layout guidelines for optimal performance.
How does the CLR pin function on the LTC2751ACUHF-16#PBF?
The CLR pin on the LTC2751ACUHF-16#PBF provides asynchronous reset to zero scale in the currently active output range-regardless of whether the part is in SoftSpan or manual span mode. A logic-low pulse ≥20 ns forces both data input and DAC registers to the 0V code, resulting in immediate 0V output. This operation leaves span register contents unchanged and requires no clock or timing coordination.
Can the LTC2751ACUHF-16#PBF perform register readback?
Yes, the LTC2751ACUHF-16#PBF supports full bidirectional readback of both its 16-bit data register and 3-bit span register via the same D15–D0 and S2–S0 pins. Using READ, D/S, and UPD control signals, users can verify written values before updating the DAC register-enabling robust validation in safety-critical or high-reliability applications involving the LTC2751ACUHF-16#PBF.
What is the operating temperature range for the LTC2751ACUHF-16#PBF?
The LTC2751ACUHF-16#PBF is specified for the commercial temperature range of 0°C to 70°C. This grade is clearly indicated by the "C" suffix in the part number and confirmed in the manufacturer's ordering information table. All electrical specifications-including ±1 LSB INL/DNL, 2 µs settling, and 1 nV·s glitch impulse-are guaranteed across this full range.
LTC2751ACUHF-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 16
- Number of D/A Converters:
- 1
- Settling Time:
- 2µs (Typ)
- Output Type:
- Current - Unbuffered
- Differential Output:
- Yes
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- INL/DNL (LSB):
- ±0.4, ±0.2
- Architecture:
- Multiplying DAC
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2751ACUHF-16#PBF FAQ
1.How can I place an order for LTC2751ACUHF-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2751ACUHF-16#PBF 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 LTC2751ACUHF-16#PBF reliable?
The price and inventory of LTC2751ACUHF-16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2751ACUHF-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2751ACUHF-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2751ACUHF-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2751ACUHF-16#PBF?
LTC2751ACUHF-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2751ACUHF-16#PBF 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 LTC2751ACUHF-16#PBF?
For technical support, including LTC2751ACUHF-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2751ACUHF-16#PBF requirements.
6.How does Aetrix verify that LTC2751ACUHF-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2751ACUHF-16#PBF 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 LTC2751ACUHF-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2751ACUHF-16#PBF?
All LTC2751ACUHF-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2751ACUHF-16#PBF, 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 LTC2751ACUHF-16#PBF part is unused and in its original packaging.
Return procedure for LTC2751ACUHF-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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