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Analog Devices Inc. LTC2634IUD-HMX12#TRPBF
- Part No.:
- LTC2634IUD-HMX12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC2634IUD-HMX12#TRPBF.pdf
- Description:
- IC DAC 12BIT V-OUT 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
LTC2634IUD-HMX12#TRPBF from Analog Devices is a quad 12-bit rail-to-rail voltage-output DAC with integrated 4.096V ±10ppm/°C reference, operating from 4.5V to 5.5V supply. It features SPI/MICROWIRE-compatible 50MHz serial interface, double-buffered latches, asynchronous LDAC and CLR, and guaranteed monotonicity across –40°C to 85°C. Used in precision industrial control loops requiring stable multi-channel analog output.
For engineers reviewing the LTC2634IUD-HMX12#TRPBF datasheet, LTC2634IUD-HMX12#TRPBF pinout, LTC2634IUD-HMX12#TRPBF application, or LTC2634IUD-HMX12#TRPBF equivalent, key selection criteria include external-reference mid-scale power-on reset behavior, 2.4nV·s DAC-to-DAC crosstalk, ±2.5LSB INL, 4.8µs settling time at 12-bit, and QFN-16 package compatibility with daisy-chain SDO support.
Technical Context
The LTC2634IUD-HMX12#TRPBF implements four independent 12-bit DAC cores sharing a single 32-bit shift register and decode logic, with hardware LDAC enabling simultaneous update of all outputs. Its internal reference switch selects between 2.048V (half-scale) output at REF pin or external reference mode where full-scale equals VREF input (1V to VCC).
Power-on reset defaults to mid-scale under external reference mode-output settles to VREF/2 on power-up-while digital interface timing complies with SPI Mode 0/3 (CPOL=0, CPHA=0/1), supporting 50MHz SCK with 7ns setup/hold margins. The device incorporates power-down mode reducing ICC to ≤30µA at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-precision analog control |
| Full-Scale Output | 0 to VREF - supports external reference up to 5.5V; internal reference disabled in HMX variant |
| INL Error | ±2.5 LSB - ensures accurate transfer function over full temperature range (–40°C to 85°C) |
| Settling Time | 4.8 µs to ±1 LSB - enables fast closed-loop response in real-time control systems |
| DAC Crosstalk | 2.4 nV·s - minimizes interference between channels during dynamic updates |
| Supply Range | 4.5V to 5.5V - matches standard 5V industrial bus rails with tight regulation tolerance |
| Reference Mode | External only with mid-scale reset - eliminates need for post-power-up software initialization |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed pad (Pin 17 = GND). RoHS-compliant, lead-free, tape-and-reel (2500 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUTA–VOUTD (Pins 1,2,11,12) | Analog voltage outputs | Rail-to-rail buffered outputs; each drives ≥2kΩ load with <0.16 LSB/mA load regulation |
| LDAC (Pin 3) | Asynchronous DAC update | Falling edge triggers immediate latch update; powers up DACs when held low |
| CS/LD (Pin 4) | Chip select / load command | Active-low enables SCK; rising edge executes command (write, power-down, etc.) |
| SCK (Pin 5) | Serial clock input | Accepts 50MHz CMOS/TTL clock; controls data shift into 32-bit register |
| DNC (Pins 6,15) | No-connect | Must remain unconnected; no internal connection or function |
| SDO (Pin 7) | Serial data output | 32-cycle delayed echo of SDI input; enables daisy-chaining without tri-state logic |
| SDI (Pin 8) | Serial data input | Accepts 24- or 32-bit words on SCK rising edge; MSB-first format |
| CLR (Pin 9) | Asynchronous clear | Level-sensitive low resets all registers to mid-scale (VREF/2) in external reference mode |
| REF (Pin 10) | Reference input/output | In HMX mode: input only (1V ≤ VREF ≤ VCC); bypass with 0.1µF to GND |
| REFLO (Pin 13) | Reference low | Internally tied to GND; sets zero-scale reference point for all DACs |
| GND (Pin 14) | Ground | Analog/digital common return; connects to exposed pad (Pin 17) |
| VCC (Pin 16) | Positive supply | 4.5V–5.5V only; requires local 0.1µF ceramic decoupling to GND |
Key Features
| Feature | Design Value |
|---|---|
| External-reference mid-scale power-on reset | Outputs initialize to VREF/2 without firmware intervention-critical for fail-safe analog subsystems |
| Ultralow DAC-to-DAC crosstalk (2.4nV·s) | Prevents signal corruption in multi-axis motion control where simultaneous channel updates occur |
| Double-buffered input registers | Enables seamless background loading of new codes while maintaining current output until LDAC pulse |
| 50MHz SPI-compatible interface | Supports high-throughput configuration in FPGA- or microcontroller-based systems with minimal CPU overhead |
| Guaranteed monotonicity (–40°C to 85°C) | Ensures predictable step response in closed-loop feedback paths without risk of instability |
Applications
| Industrial Process Control | Automotive Test Equipment |
|---|---|
Use Scenario: Four-channel analog output module for PLC I/O cards regulating valve position, pressure, temperature, and flow in chemical plants. IC Role / Device Role / Timing Role: Quad DAC provides synchronized, isolated analog setpoints to 4x industrial actuators via rail-to-rail buffers. Use Value: External reference mid-scale reset prevents spurious actuator movement at power-up; 2.4nV·s crosstalk avoids cross-channel interference in multi-loop PID control. | Use Scenario: Calibration signal source in automated test rigs validating ECU sensor inputs (e.g., throttle position, brake pressure). IC Role / Device Role / Timing Role: Generates precise, stable DC bias voltages for sensor simulation with simultaneous 4-channel update via LDAC. Use Value: 4.8µs settling enables rapid test sequence execution; ±2.5LSB INL meets ATE accuracy requirements for Class I sensor validation. |
| Medical Instrumentation | Optical Network Monitoring |
Use Scenario: Laser diode bias control in portable diagnostic devices requiring four independent, low-noise current sources. IC Role / Device Role / Timing Role: Drives external op-amp-based transconductance stages to generate precise, temperature-stable bias currents. Use Value: 10ppm/°C reference stability ensures calibration retention across clinical environments; 0.75mVP-P noise (0.1Hz–200kHz) minimizes optical signal jitter. | Use Scenario: Channel equalization in DWDM transceivers using per-lane attenuation control via analog voltage tuning of variable optical attenuators. IC Role / Device Role / Timing Role: Supplies four independent bias voltages to VOAs, updated synchronously to maintain inter-channel power balance. Use Value: Daisy-chain SDO allows compact PCB layout with single SPI bus controlling multiple LTC2634 units; QFN-16 footprint saves board space in dense optical modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5686RBCPZ-RL7 | 16-bit resolution, internal 2.5V reference, 10ppm/°C drift, same QFN-16 package | Higher resolution but fixed internal reference; lacks external-ref mid-scale reset | Select when absolute accuracy >12-bit is required and external reference flexibility is not needed |
| MCP4728-E/UN | 12-bit, I²C interface, internal 2.048V reference, MSOP-10 package, no LDAC/CLR | I²C simplifies MCU integration but limits speed; no hardware update or clear functionality | Select for cost-sensitive, lower-speed designs where SPI daisy-chaining and synchronous update are unnecessary |
Compared with AD5686RBCPZ-RL7 and MCP4728-E/UN, the LTC2634IUD-HMX12#TRPBF uniquely combines external-reference operation with guaranteed mid-scale power-on reset, ultralow crosstalk, and SPI daisy-chain capability-making it optimal for safety-critical, multi-channel industrial control where deterministic startup behavior and channel isolation are mandatory.
Availability
LTC2634IUD-HMX12#TRPBF is available at Aetrix Electronics and suitable for industrial process control, automotive test equipment, medical instrumentation, and optical network monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC2634IUD-HMX12#TRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2634 product line delivers precision, low-power, quad-channel DACs optimized for space-constrained, high-reliability applications demanding rail-to-rail output, integrated reference options, and robust digital interfaces.
FAQ
What is the power-on behavior of the LTC2634IUD-HMX12#TRPBF?
The LTC2634IUD-HMX12#TRPBF powers up with all four DAC outputs set to mid-scale (VREF/2) when operating in external reference mode-no software initialization required. This behavior is hardwired and ensures safe, repeatable startup in systems sensitive to transient analog outputs. The internal reference is disabled in the HMX variant, so REF must be driven externally.
Does the LTC2634IUD-HMX12#TRPBF support daisy-chaining via its SDO pin?
Yes, the LTC2634IUD-HMX12#TRPBF supports daisy-chaining: its SDO pin outputs the SDI data stream delayed by exactly 32 SCK rising edges, allowing multiple devices to share one SPI bus. Each device shifts data through its 32-bit register before passing it downstream-enabling compact, scalable multi-DAC systems without additional logic.
What is the maximum allowed reference voltage for the LTC2634IUD-HMX12#TRPBF?
The LTC2634IUD-HMX12#TRPBF accepts an external reference voltage from 1V up to VCC (max 5.5V). In HMX configuration, the internal reference is disabled, so REF functions solely as an input. The full-scale DAC output equals the applied VREF, and the device guarantees rail-to-rail operation (0V to VREF) across the specified temperature range.
How does the LDAC pin function in the LTC2634IUD-HMX12#TRPBF?
The LDAC pin on the LTC2634IUD-HMX12#TRPBF provides asynchronous, hardware-controlled update of all four DAC outputs. A falling edge immediately transfers data from input registers to DAC registers-enabling precise timing of analog output changes independent of SPI transaction completion. When CS/LD is low, LDAC falling edge triggers update upon CS/LD rising edge.
Can the LTC2634IUD-HMX12#TRPBF operate from a 3.3V supply?
No-the LTC2634IUD-HMX12#TRPBF requires a minimum supply voltage of 4.5V due to its 4.096V internal reference architecture and associated buffer headroom. Operation below 4.5V violates the Absolute Maximum Ratings and will result in undefined output behavior or failure to meet specifications. For 3.3V systems, consider the LTC2634-L series variants instead.
LTC2634IUD-HMX12#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 4
- Settling Time:
- 4.8µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- SPI
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- INL/DNL (LSB):
- ±1, ±1 (Max)
- Architecture:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2634IUD-HMX12#TRPBF FAQ
1.How can I place an order for LTC2634IUD-HMX12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2634IUD-HMX12#TRPBF 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 LTC2634IUD-HMX12#TRPBF reliable?
The price and inventory of LTC2634IUD-HMX12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2634IUD-HMX12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2634IUD-HMX12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2634IUD-HMX12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2634IUD-HMX12#TRPBF?
LTC2634IUD-HMX12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2634IUD-HMX12#TRPBF 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 LTC2634IUD-HMX12#TRPBF?
For technical support, including LTC2634IUD-HMX12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2634IUD-HMX12#TRPBF requirements.
6.How does Aetrix verify that LTC2634IUD-HMX12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2634IUD-HMX12#TRPBF 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 LTC2634IUD-HMX12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2634IUD-HMX12#TRPBF?
All LTC2634IUD-HMX12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2634IUD-HMX12#TRPBF, 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 LTC2634IUD-HMX12#TRPBF part is unused and in its original packaging.
Return procedure for LTC2634IUD-HMX12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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