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Analog Devices Inc. DC1112A
- Part No.:
- DC1112A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1112A.pdf
- Description:
- EVAL BOARD FOR LTC2755-16
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Product details
Overview
LTC2755-16 from Analog Devices (formerly Linear Technology) is a quad 16-bit multiplying current-output DAC with parallel I/O, SoftSpan™ programmable output ranges (±10V, ±5V, –2.5V to +7.5V, 0V to 5V, 0V to 10V), ±1 LSB INL over temperature, and 2 µs settling time. It operates from a single 2.7V–5.5V supply and serves as a precision voltage generator in industrial control loops requiring high-resolution analog stimulus.
For engineers reviewing the LTC2755-16 datasheet, LTC2755-16 pinout, LTC2755-16 application, or LTC2755-16 equivalent, key selection criteria include guaranteed monotonicity over temperature, readback-capable parallel interface, hardware-selectable vs. software-programmable span modes, low 1 nV·s glitch impulse, and compatibility with external op-amps for VOUT conversion.
Technical Context
The LTC2755-16 implements a proprietary SoftSpan™ switching architecture that maintains constant input resistance across all six output ranges when IOUT1X/IOUT2X are grounded. Its bidirectional parallel interface supports full register readback-including span configuration-via D/S, READ, WR, and UPD control signals, enabling real-time verification of DAC state and range settings.
Each of the four independent DAC channels features dedicated reference (REFX), feedback (RFBX), bipolar offset (ROFSX), and offset adjust (RVOSX) terminals, allowing per-channel gain/offset trimming and flexible unipolar/bipolar output configurations without shared resource contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - delivers 65,536 discrete output steps with ±1 LSB integral nonlinearity over full industrial temperature range. |
| Output Ranges | Six programmable spans: ±10V, ±5V, –2.5V to +7.5V, 0V to 5V, 0V to 10V - enables single-device support for multiple sensor excitation or actuator drive requirements. |
| Settling Time | 2 µs to ±1 LSB - ensures fast response in closed-loop test systems and real-time waveform generation without post-conversion delays. |
| Glitch Impulse | 1 nV·s - minimizes transient injection during code transitions, critical for precision instrumentation and sensitive analog front-ends. |
| Supply Current | 1 µA max - enables ultra-low-power operation in battery-backed or energy-constrained embedded systems. |
| Interface | Parallel I/O with readback - allows deterministic timing control and on-the-fly validation of DAC register contents, eliminating blind writes. |
| Monotonicity | Guaranteed over temperature - ensures predictable stepwise behavior in safety-critical control applications without risk of output reversal. |
Pinout & Package
64-lead (9 mm × 9 mm) plastic QFN package with exposed pad (Pin 65 = GND, must be soldered). Pin count and layout are identical across LTC2755-12/-14/-16 variants; only data bus width differs (12/14/16 bits).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D15 | Data I/O bus | Bidirectional parallel port for loading DAC codes and reading back registers; MSB-aligned (D15 = MSB for -16 variant). |
| S0–S2 | Span I/O bits | Programmable output range selection (6 combinations); readable to verify active span configuration. |
| A0–A2 | DAC address lines | Select one of four DACs (A–D) for write/read/update operations; enables channel-specific control without global broadcast. |
| WR / UPD / READ / D/S | Control interface | Asynchronous parallel protocol: WR latches data, UPD updates DAC registers, READ enables output, D/S selects data vs. span port. |
| CLR | Asynchronous clear | Forces all DAC outputs to 0 V in current range - provides deterministic reset independent of clock or register state. |
| IOUT1X / IOUT2X | Dual current outputs per DAC | IOUT1X sources/sinks current; IOUT2X is complementary - used with external op-amp for precision voltage output (e.g., LT1469). |
| REFX / RFBX / ROFSX / RVOSX | Analog configuration network | Per-channel terminals for reference scaling, feedback gain, bipolar offset translation, and fine zero adjustment - supports independent calibration. |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ programmability | Hardware- or software-selectable output ranges eliminate need for external level-shifting circuitry or multiple DACs per system. |
| Full register readback | Enables runtime verification of DAC code, span setting, and address state - critical for functional safety diagnostics and fault logging. |
| Power-on reset to 0 V | Prevents undefined output transients at power-up - avoids unintended actuator movement or sensor overdrive in automated equipment. |
| Low-glitch architecture | 1 nV·s glitch impulse reduces EMI and prevents false triggering in adjacent analog or RF circuits during code changes. |
| Per-channel analog tuning | Dedicated REFX, RFBX, ROFSX, RVOSX pins allow individual gain/offset compensation - simplifies system-level calibration and improves channel-to-channel matching. |
Applications
| Process Control Loop Calibration | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Calibrating 4–20 mA transmitter simulators and field instrument test sets requiring precise, stable DC voltage stimuli across multiple ranges. IC Role / Device Role / Timing Role: Quad 16-bit current-output DAC generating calibrated reference voltages for loop calibrator front-ends via external I/V amplifiers. Use Value: ±1 LSB INL and guaranteed monotonicity ensure traceable accuracy per NIST standards; parallel readback validates stimulus integrity before measurement capture. |
Use Scenario: Stimulating DUT inputs in semiconductor ATE platforms where synchronized multi-channel analog stimulus and fast settling are mandatory. IC Role / Device Role / Timing Role: High-speed quad DAC delivering simultaneous voltage waveforms to device under test with sub-microsecond timing alignment. Use Value: 2 µs settling and 1 nV·s glitch enable clean edge transitions and minimal settling-induced test uncertainty in high-throughput production testing. |
| Data Acquisition System Excitation | Industrial PLC Analog Output Module |
Use Scenario: Providing programmable excitation voltages to bridge sensors (load cells, strain gauges) in high-resolution DAQ systems with dynamic range adaptation. IC Role / Device Role / Timing Role: SoftSpan™ DAC supplying configurable excitation (±10V, 0–10V) to sensor signal chains, adapting to varying sensor sensitivities and full-scale ranges. Use Value: Six selectable output ranges eliminate external range-switching relays or multiplexers - reducing BOM cost, board area, and failure points. |
Use Scenario: Generating isolated analog outputs (0–10V, 4–20mA) in modular PLC I/O cards where reliability, long-term stability, and EMC robustness are critical. IC Role / Device Role / Timing Role: Precision quad DAC serving as the core analog output engine, interfacing with isolation amplifiers and current-sense feedback loops. Use Value: Low 1 µA supply current extends thermal margin in densely packed modules; monotonicity guarantee ensures safe ramping of motor drives or valve actuators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 16-bit DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5755-4ACPZ | Voltage-output (not current-output); integrated HART modem; SPI interface only; no parallel readback. | Targeted at smart transmitter design with digital communication; lacks SoftSpan™ range flexibility and deterministic parallel timing. | Choose AD5755-4 if HART compliance and voltage output are required; avoid if current-output topology or parallel interface is mandatory. |
| MAX5717ETN+ | Quad 16-bit current-output DAC; SPI-only interface; no span programming; fixed ±10V/0–10V dual-range support. | Designed for space-constrained, low-pin-count applications; no per-channel analog tuning terminals (no ROFSX/RVOSX). | Choose MAX5717ETN+ for simplified SPI-based designs where range flexibility and analog trim are not needed; avoid if SoftSpan™ or parallel readback is required. |
Compared with AD5755-4ACPZ and MAX5717ETN+, the LTC2755-16 uniquely combines parallel readback, hardware/software span selection, and full per-channel analog configuration - making it optimal for high-integrity, serviceable, and field-adaptable industrial analog systems.
Availability
LTC2755-16 is available at Aetrix Electronics and suitable for process control calibration, automated test equipment, data acquisition excitation, industrial PLC analog output modules, and precision instrumentation requiring stable component supply across extended product lifecycles.
Supply support for LTC2755-16 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 for industrial, automotive, communications, and healthcare markets.
The LTC2755 family was designed specifically for high-accuracy, multi-channel analog stimulus generation in industrial automation and test systems - emphasizing configurability, diagnostic capability, and long-term stability over temperature and time.
FAQ
What is the maximum operating temperature range for the LTC2755-16?
The LTC2755-16 is specified for industrial temperature range (–40°C to +85°C) in the I-grade version (e.g., LTC2755IUP-16). The C-grade version operates from 0°C to +70°C. Both grades guarantee ±1 LSB INL and monotonicity across their respective full temperature ranges - a key differentiator for mission-critical analog systems.
Does the LTC2755-16 require external op-amps to generate voltage outputs?
Yes, the LTC2755-16 is a current-output DAC. To produce voltage outputs, each IOUT1X terminal must be connected to the inverting input of an external op-amp (e.g., LT1469), with the feedback resistor (RFBX) tied between the op-amp output and RFBX pin. This architecture enables precise gain control and wide output range flexibility via external component selection.
How does the SoftSpan™ feature work on the LTC2755-16?
SoftSpan™ allows the LTC2755-16 to generate six distinct output voltage ranges (±10V, ±5V, –2.5V to +7.5V, 0–5V, 0–10V) by configuring S0–S2 bits via parallel interface or pin-strapping MSPAN. Internally, it reconfigures reference routing and offset networks - all while maintaining constant input resistance and guaranteed linearity - eliminating external range-switching components.
Can the LTC2755-16 perform register readback, and what can be read?
Yes, the LTC2755-16 supports full register readback via its parallel interface. By asserting READ high and selecting D/S = 0 (data port) or D/S = 1 (span port), users can read back the loaded DAC code (D0–D15), current span configuration (S0–S2), and DAC address (A0–A2) - enabling real-time verification and fault detection in safety-critical applications.
What is the purpose of the MSPAN pin on the LTC2755-16?
MSPAN configures the LTC2755-16 for either SoftSpan™ (MSPAN = GND) or fixed single-span (MSPAN = VDD) operation. In SoftSpan™ mode, output range is dynamically programmed via S0–S2. In single-span mode, the range is hardwired by pin strapping - disabling S0–S2 functionality and simplifying control logic in static-range applications.
DC1112A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Packaging:
- Box
- Product Status:
- Active
- Number of DAC's:
- 4
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- -
- Data Interface:
- Parallel
- Settling Time:
- 2 µs
- DAC Type:
- Current
- Utilized IC / Part:
- LTC2755-16
- Contents:
- Board(s)
DC1112A FAQ
1.How can I place an order for DC1112A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1112A 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 DC1112A reliable?
The price and inventory of DC1112A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1112A is usually 5 days.
3.What payment methods are accepted for DC1112A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1112A transactions.
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4.How is shipping managed for DC1112A?
DC1112A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1112A 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 DC1112A?
For technical support, including DC1112A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1112A requirements.
6.How does Aetrix verify that DC1112A is sourced from the original manufacturer or authorized distributors?
All DC1112A 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 DC1112A meets industry standards.
7.What is the process for return or replacement of DC1112A?
All DC1112A units undergo pre-shipment inspection (PSI). If there is an issue with DC1112A, 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 DC1112A part is unused and in its original packaging.
Return procedure for DC1112A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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