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Analog Devices Inc. LTC2635CUD-LMX8#PBF
- Part No.:
- LTC2635CUD-LMX8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC2635CUD-LMX8#PBF.pdf
- Description:
- IC DAC 8BIT V-OUT 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
LTC2635CUD-LMX8#PBF from Analog Devices is a quad 8-bit voltage-output DAC with integrated 2.5V precision reference (10ppm/°C), rail-to-rail output buffers, and I²C interface. It operates from 2.7V to 5.5V, delivers ±0.5 LSB INL, 3.5µs settling time, and ultralow 2.6nV·s DAC-to-DAC crosstalk - used in power supply margining and industrial process control where multi-channel analog output stability is critical.
For engineers reviewing the LTC2635CUD-LMX8#PBF datasheet, LTC2635CUD-LMX8#PBF pinout, LTC2635CUD-LMX8#PBF application, or LTC2635CUD-LMX8#PBF equivalent, key selection criteria include external reference support, mid-scale power-on reset behavior, QFN-16 package thermal performance, and guaranteed monotonicity across –40°C to 125°C for automotive-grade designs.
Technical Context
The LTC2635CUD-LMX8#PBF implements four independent 8-bit DAC channels sharing a single 2-wire I²C bus with address selection via CA0–CA2 pins. Its internal reference mode delivers 2.5V full-scale output; external reference mode accepts 1V to VCC input, scaling output linearly. Power-on reset defaults to mid-scale when external reference is active.
Each DAC features double-buffered registers, enabling synchronous updates via LDAC pin or automatic update after I²C write completion. Output buffers are rail-to-rail capable with 0.09Ω DC impedance and support ±5mA load current at 3V supply - optimized for low-noise, low-crosstalk analog control in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - supports 256 discrete output levels for coarse but stable analog control loops |
| INL Error | ±0.5 LSB - ensures accurate transfer function without calibration in closed-loop systems |
| Settling Time | 3.5 µs to ±1 LSB - enables fast step response in dynamic margining applications |
| Reference Tempco | 10 ppm/°C - maintains <±0.25% full-scale drift over 0°C to 70°C commercial range |
| Supply Range | 2.7V to 5.5V - compatible with single-supply 3.3V and 5V systems without level-shifting |
| I²C Speed | 400 kHz fast mode - allows high-throughput configuration of all four DACs in <100 µs |
| Crosstalk | 2.6 nV·s - prevents unintended channel interaction during simultaneous updates |
Pinout & Package
16-pin 3mm × 3mm QFN package with exposed thermal pad (Pin 17 = GND). Pin 1 = VCC; Pins 2/3/8/9 = VOUTA/VOUTB/VOUTD/VOUTC; Pin 4 = CA0; Pin 5 = SCL; Pin 6 = SDA; Pin 7 = REF; Pin 9 = CA1; Pin 10 = GND; Pin 15 = DNC; Pin 16 = VCC; Pin 17 = Exposed Pad (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 16) | Positive supply input | Must be bypassed with 0.1µF ceramic capacitor; powers DAC core, reference, and I²C interface |
| VOUTA–VOUTD (Pins 2, 3, 8, 9) | Analog voltage outputs | Rail-to-rail buffered outputs; each drives ±5mA into 2kΩ//100pF loads |
| LDAC (Pin 3) | Asynchronous update strobe | Falling edge triggers simultaneous DAC register update; low at power-up forces DACs active |
| CA0–CA2 (Pins 4, 7, 9) | I²C slave address bits | Three pins configure one of eight possible I²C addresses (0x48–0x4F) via VCC/GND/floating |
| SCL/SDA (Pins 5, 6) | I²C serial interface | Open-drain pins requiring external pull-ups; support standard (100kHz) and fast (400kHz) modes |
| REF (Pin 7) | Reference input/output | In external mode: 1V–VCC input sets full-scale; in internal mode: 1.25V output (half-scale) |
| GND (Pin 10, Pad 17) | Ground reference | Exposure pad must be soldered to PCB ground plane for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10ppm/°C reference | Eliminates external reference IC and trimming, reducing BOM count and layout area in space-constrained modules |
| Mid-scale power-on reset (external ref) | Prevents transient output spikes during startup when using external references - critical for sensitive analog loads |
| Ultralow 2.6nV·s crosstalk | Enables independent control of multiple actuators or sensors without signal coupling artifacts |
| Double-buffered data latches | Allows seamless background register loading while maintaining stable output until LDAC-triggered update |
| Guaranteed monotonicity | Ensures no code-dependent output reversal across –40°C to 125°C - required for safety-critical feedback paths |
Applications
| Power Supply Margining | Industrial Process Control |
|---|---|
Use Scenario: Adjusting CPU core voltage within ±5% of nominal during production test to verify system robustness. IC Role / Device Role / Timing Role: Quad DAC generates precise bias voltages for PMIC feedback nodes; synchronized updates via LDAC ensure simultaneous rail adjustment. Use Value: 8-bit resolution provides sufficient granularity for margining steps; 3.5µs settling enables rapid test sequencing without timing bottlenecks. | Use Scenario: Controlling four pneumatic valve positions in a PLC-based chemical dosing system. IC Role / Device Role / Timing Role: Each DAC channel drives a separate 4–20mA transmitter; I²C address bits allow daisy-chaining multiple LTC2635 units on one bus. Use Value: Integrated 2.5V reference eliminates need for external precision source; monotonicity guarantees repeatable valve positioning across temperature. |
| Automotive Sensor Calibration | Portable Medical Instrumentation |
Use Scenario: Compensating offset/gain errors in MEMS pressure sensor front-end during factory calibration. IC Role / Device Role / Timing Role: DACs inject calibrated correction voltages into sensor signal path; external reference mode matches sensor excitation voltage. Use Value: Mid-scale POR prevents erroneous actuation during ignition cycle; ±0.5 LSB INL meets AEC-Q200 functional accuracy requirements. | Use Scenario: Generating programmable bias for low-power ECG amplifier stages in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low 0.6mA supply current extends battery life; rail-to-rail outputs interface directly with op-amp inputs without level-shifting. Use Value: QFN-16 package fits tight board real estate; 10ppm/°C reference ensures stable baseline over body-temperature operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4728-E/UN | 12-bit resolution, no integrated reference, 2.7–5.5V supply, ±2 LSB INL | Lacks internal reference - requires external 2.5V source; higher resolution but lower absolute accuracy | Select when higher code density is needed and external reference is already present |
| AD5664RBRMZ-5 | 16-bit resolution, internal 2.5V reference (5ppm/°C), 2.7–5.5V supply, ±4 LSB INL | Better tempco and resolution but larger MSOP-10 package; no CA0–CA2 address flexibility | Select when ultra-low drift and fine control outweigh I²C address configurability needs |
Compared with MCP4728-E/UN and AD5664RBRMZ-5, the LTC2635CUD-LMX8#PBF offers optimal balance of guaranteed monotonicity, ultralow crosstalk, and flexible I²C addressing - making it preferred for multi-DAC systems where channel independence and startup behavior are design-critical.
Availability
LTC2635CUD-LMX8#PBF is available at Aetrix Electronics and suitable for power supply margining, industrial process control, automotive sensor calibration, and portable medical instrumentation requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for LTC2635CUD-LMX8#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2635 product line delivers precision quad DACs with integrated references and I²C interfaces - designed specifically for space-constrained, multi-channel analog control applications demanding low crosstalk and predictable power-on behavior.
FAQ
What does the "LMX" suffix indicate in LTC2635CUD-LMX8#PBF?
The "LMX" suffix denotes that the LTC2635CUD-LMX8#PBF resets to mid-scale upon power-up when operating in external reference mode. This behavior prevents transient output glitches during system startup when an external reference is used - a critical feature for driving sensitive analog loads like transducers or calibration circuits. The "L" specifies 2.5V full-scale internal reference capability, "M" indicates mid-scale reset, and "X" confirms external reference operation.
Does LTC2635CUD-LMX8#PBF support both internal and external reference configurations?
Yes, LTC2635CUD-LMX8#PBF supports both configurations. When REF pin is left unconnected or tied appropriately, the device uses its internal 2.5V reference (10ppm/°C). When an external voltage (1V to VCC) is applied to REF, the DAC full-scale output scales linearly to match that reference - enabling flexible system-level voltage scaling without hardware changes. The LMX variant's mid-scale POR applies only in external reference mode.
What is the maximum capacitive load the LTC2635CUD-LMX8#PBF outputs can drive?
The LTC2635CUD-LMX8#PBF outputs are specified to drive up to 500pF capacitively while maintaining 3.5µs settling time and monotonicity. For heavier loads, external op-amp buffering is recommended. The internal reference output (at REF pin) supports up to 10µF bypass capacitance - essential for stabilizing the reference under dynamic load conditions without oscillation.
How many unique I²C addresses can be configured on LTC2635CUD-LMX8#PBF?
LTC2635CUD-LMX8#PBF supports eight unique I²C addresses (0x48–0x4F) via three address pins: CA0, CA1, and CA2. Each pin can be tied to VCC, GND, or left floating - yielding 2³ = 8 combinations. This enables up to eight LTC2635 devices on a single I²C bus without address conflict, simplifying multi-channel analog output expansion in modular systems.
Is the exposed thermal pad (Pin 17) of LTC2635CUD-LMX8#PBF required to be connected?
Yes, the exposed thermal pad (Pin 17) of LTC2635CUD-LMX8#PBF must be soldered to the PCB ground plane. It serves as both a thermal dissipation path and a low-inductance ground return for analog and digital sections. Omitting this connection degrades thermal performance (θJA increases from 68°C/W to >100°C/W), raises junction temperature under load, and may introduce noise or instability in precision output signals.
LTC2635CUD-LMX8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 4
- Settling Time:
- 3.5µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- I2C
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- INL/DNL (LSB):
- ±0.05, ±0.5 (Max)
- Architecture:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2635CUD-LMX8#PBF FAQ
1.How can I place an order for LTC2635CUD-LMX8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2635CUD-LMX8#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 LTC2635CUD-LMX8#PBF reliable?
The price and inventory of LTC2635CUD-LMX8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2635CUD-LMX8#PBF is usually 5 days.
3.What payment methods are accepted for LTC2635CUD-LMX8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2635CUD-LMX8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2635CUD-LMX8#PBF?
LTC2635CUD-LMX8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2635CUD-LMX8#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 LTC2635CUD-LMX8#PBF?
For technical support, including LTC2635CUD-LMX8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2635CUD-LMX8#PBF requirements.
6.How does Aetrix verify that LTC2635CUD-LMX8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2635CUD-LMX8#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 LTC2635CUD-LMX8#PBF meets industry standards.
7.What is the process for return or replacement of LTC2635CUD-LMX8#PBF?
All LTC2635CUD-LMX8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2635CUD-LMX8#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 LTC2635CUD-LMX8#PBF part is unused and in its original packaging.
Return procedure for LTC2635CUD-LMX8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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