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Analog Devices Inc. LTC2640CTS8-LZ10#TRMPBF
- Part No.:
- LTC2640CTS8-LZ10#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2640CTS8-LZ10#TRMPBF.pdf
- Description:
- IC DAC 10BIT V-OUT TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2640CTS8-LZ10#TRMPBF from Analog Devices is a 10-bit, single-channel, rail-to-rail voltage-output DAC with integrated 2.5V ±10ppm/°C reference, SPI/MICROWIRE™-compatible 3-wire interface, and power-on reset to zero-scale. It operates from 2.7V to 5.5V, delivers ±1LSB INL (max), settles in 3.8µs to ±1LSB, and draws only 180µA at 3V - enabling precision analog control in space-constrained industrial sensor interfaces.
For engineers reviewing the LTC2640CTS8-LZ10#TRMPBF datasheet, LTC2640CTS8-LZ10#TRMPBF pinout, LTC2640CTS8-LZ10#TRMPBF application, or LTC2640CTS8-LZ10#TRMPBF equivalent, key selection criteria include guaranteed monotonicity over temperature, low 0.7mVPP (0.1Hz–200kHz) output noise, 50MHz max SCK rate, TSOT-23-8 package compatibility, and support for both internal reference (2.5V full-scale) and external reference modes.
Technical Context
The LTC2640CTS8-LZ10#TRMPBF implements a resistor-divider-based DAC architecture with double-buffered input and DAC registers, enabling glitch-free updates via Write+Update commands. Its internal 2.5V reference features ±10ppm/°C drift and is accessible at the REF pin for buffering or external use.
It supports SPI-compatible serial communication with 24-bit framing (4-bit command + 4 don't-care + 16-bit data), operates with CS/LD level-triggered load control, and includes asynchronous hardware CLR (Pin 8) for immediate zero-scale reset - critical for fail-safe analog output initialization in safety-critical subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output levels with ±1LSB integral nonlinearity (INL) maximum across –40°C to 85°C. |
| Full-Scale Output | 2.5V (internal reference mode) - enables direct interfacing with 2.5V logic or ADC reference domains without level-shifting. |
| Settling Time | 3.8µs to ±1LSB - ensures fast response for closed-loop control loops requiring sub-10µs update cycles. |
| Supply Current | 180µA at 3V - supports ultra-low-power battery-operated instrumentation and portable test equipment. |
| Reference Tempco | ±10ppm/°C - guarantees <±0.25% full-scale drift over –40°C to 85°C, eliminating need for external calibration in industrial environments. |
| Power-Down Current | 1.8µA max (H-grade) - allows deep sleep between measurement cycles in energy-harvesting sensor nodes. |
| SPI Clock Rate | 50MHz - supports high-throughput digital control in real-time systems with minimal serial overhead. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 3mm × 1.7mm footprint, 0.65mm pitch, thermal resistance θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS/LD (Pin 1) | Chip Select / Load Enable | Level-triggered active-low signal that enables SCK/SDI and initiates command execution on rising edge - supports daisy-chaining and multi-DAC synchronization. |
| SCK (Pin 2) | Serial Clock Input | CMOS/TTL-compatible clock up to 50MHz; data latched on rising edge - enables deterministic timing for deterministic control loop latency. |
| SDI (Pin 3) | Serial Data Input | 24-bit frame input (command + don't-care + data); accepts 10-bit code MSB-aligned with 6 trailing don't-care bits - simplifies FPGA/microcontroller driver development. |
| GND (Pin 4) | Analog/Digital Ground | Single ground pin shared by analog and digital sections - requires star grounding and local 0.1µF bypass to minimize PSR degradation. |
| VCC (Pin 5) | Positive Supply | 2.7V–5.5V operation; powers internal reference, DAC core, and I/O - must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin. |
| REF (Pin 6) | Reference I/O | Bidirectional: outputs 2.5V internal reference (±10ppm/°C) or accepts external 0–VCC input to set full-scale - enables flexible scaling without external op-amps. |
| VOUT (Pin 7) | Analog Voltage Output | Rail-to-rail buffered output capable of sourcing/sinking ±10mA - drives 2kΩ loads directly while maintaining monotonicity and low distortion. |
| CLR (Pin 8) | Asynchronous Clear | Active-low level-triggered reset forcing VOUT to 0V regardless of register state - provides hardware-level fault recovery for safety-critical actuator control. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Monotonicity | Ensures no output voltage reversal across all codes and temperatures - essential for stable feedback in PID controllers and motor commutation. |
| Low 0.7mVPP Output Noise | 0.1Hz–200kHz bandwidth enables high-resolution measurements in precision data acquisition without post-DAC filtering. |
| Hardware Asynchronous CLR | Enables deterministic zero-output assertion within nanoseconds - critical for emergency shutdown in industrial motion control. |
| Double-Buffered Registers | Separates input loading from DAC update, preventing partial-code glitches during concurrent write-and-execute operations. |
| Power-On Reset to Zero-Scale | Eliminates startup transients in downstream circuitry - ensures predictable initial state without software initialization delay. |
| TSOT-23-8 Small Footprint | 3mm × 1.7mm size supports high-density PCB layouts in portable medical devices and compact PLC I/O modules. |
Applications
| Industrial Sensor Calibration | Portable Test Equipment |
|---|---|
|
Use Scenario: Calibrating 4–20mA current loop transmitters using microcontroller-generated reference voltages. IC Role / Device Role / Timing Role: Precision voltage source setting DAC-based current mirror bias points with traceable 2.5V reference. Use Value: ±1LSB INL and ±10ppm/°C reference stability ensure calibration accuracy remains within 0.1% FSR over full industrial temperature range. |
Use Scenario: Generating programmable DC bias for handheld oscilloscope front-end amplifiers. IC Role / Device Role / Timing Role: Fast-settling 10-bit voltage source synchronized to trigger events via SPI command burst. Use Value: 3.8µs settling time and 50MHz SCK enable sub-10µs step-response updates, supporting real-time offset compensation. |
| Automotive Cabin Control | Optical Network Monitoring |
|
Use Scenario: Driving thermistor-based HVAC blend door actuators requiring repeatable zero-start position. IC Role / Device Role / Timing Role: Fail-safe analog output generator with hardware CLR ensuring default 0V on power-up or fault. Use Value: Asynchronous CLR and power-on reset to zero-scale prevent unintended actuator movement during vehicle ignition sequence. |
Use Scenario: Setting bias voltages for laser diode drivers in SFP+ optical transceivers. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail DAC providing stable 2.5V-referenced bias with minimal EMI coupling into RF paths. Use Value: 0.7mVPP output noise and 8-lead TSOT-23 package reduce spurious emissions near 10Gbps data lanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4822-E/SN | 12-bit, dual-channel, SPI interface; external reference only; no integrated reference; ±2LSB INL; 2.7–5.5V supply. | Requires external 2.5V reference and additional decoupling; lacks hardware CLR and power-on zero-reset. | Select when dual DAC channels are needed and system already provides precision reference; not drop-in due to missing internal reference and CLR. |
| AD5620BRJZ-REEL7 | 12-bit, single-channel, SPI; internal 2.5V reference (±10ppm/°C); 3.3–5.5V supply; no hardware CLR; ±4LSB INL. | Higher INL error limits resolution in high-accuracy calibration; no asynchronous reset complicates safety-critical zero-fault handling. | Choose for higher resolution where ±4LSB INL is acceptable and hardware reset is managed externally; pinout differs (SOT-23-6). |
Compared with MCP4822-E/SN and AD5620BRJZ-REEL7, the LTC2640CTS8-LZ10#TRMPBF uniquely combines 10-bit precision with integrated 2.5V reference, hardware CLR, and guaranteed monotonicity - making it optimal for zero-fault-critical, space-constrained analog control where reference integration and deterministic reset are mandatory.
Availability
LTC2640CTS8-LZ10#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor calibration, portable test equipment, automotive cabin control, and optical network monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2640CTS8-LZ10#TRMPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2640 product line delivers single-channel, low-power, precision voltage-output DACs with integrated references for applications demanding high accuracy, small size, and robust operation across extended temperature ranges.
FAQ
What is the full-scale output voltage of the LTC2640CTS8-LZ10#TRMPBF in internal reference mode?
The LTC2640CTS8-LZ10#TRMPBF has a full-scale output voltage of 2.5V when operating in internal reference mode, derived from its integrated 2.5V ±10ppm/°C reference. This value is fixed and does not vary with supply voltage within the 2.7V–5.5V operating range, enabling stable scaling for 10-bit (1024-step) analog output generation.
Does the LTC2640CTS8-LZ10#TRMPBF support external reference operation?
Yes, the LTC2640CTS8-LZ10#TRMPBF supports external reference operation via the REF pin (Pin 6), which accepts an input voltage from 0V to VCC. When an external reference is applied, the full-scale output becomes equal to that reference voltage - allowing flexible scaling from 0V to 5.5V while retaining the device's ±1LSB INL performance and rail-to-rail output capability.
What is the purpose of the CLR pin on the LTC2640CTS8-LZ10#TRMPBF?
The CLR (Pin 8) on the LTC2640CTS8-LZ10#TRMPBF is an asynchronous, level-triggered clear input that forces the DAC output to zero-scale (0V) immediately upon assertion, independent of SPI activity or register contents. This hardware reset is critical for safety-critical applications such as industrial actuator control, where deterministic zero-output must be guaranteed during fault conditions or power cycling.
What is the maximum SPI clock frequency supported by the LTC2640CTS8-LZ10#TRMPBF?
The LTC2640CTS8-LZ10#TRMPBF supports a maximum SPI clock (SCK) frequency of 50MHz with 50% duty cycle, as specified across its full operating temperature range. This high-speed interface enables rapid updates - for example, completing a full 24-bit write-and-update command in under 500ns - making it suitable for real-time closed-loop control systems requiring low-latency analog output changes.
How does the power-on reset behavior of the LTC2640CTS8-LZ10#TRMPBF differ from mid-scale reset variants?
The LTC2640CTS8-LZ10#TRMPBF features power-on reset to zero-scale (denoted by "Z" in the part number), meaning its output defaults to 0V at power-up. This contrasts with mid-scale reset variants (e.g., LTC2640CTS8-LM10#TRMPBF), which initialize to 1.25V. The zero-scale reset eliminates transient voltage spikes in downstream circuits during startup - a key requirement in applications like valve control or laser biasing where nonzero initial states could cause damage or instability.
LTC2640CTS8-LZ10#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 10
- Number of D/A Converters:
- 1
- Settling Time:
- 3.8µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- SPI
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- INL/DNL (LSB):
- ±0.2, ±0.5 (Max)
- Architecture:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2640CTS8-LZ10#TRMPBF FAQ
1.How can I place an order for LTC2640CTS8-LZ10#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2640CTS8-LZ10#TRMPBF 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 LTC2640CTS8-LZ10#TRMPBF reliable?
The price and inventory of LTC2640CTS8-LZ10#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2640CTS8-LZ10#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2640CTS8-LZ10#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2640CTS8-LZ10#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2640CTS8-LZ10#TRMPBF?
LTC2640CTS8-LZ10#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2640CTS8-LZ10#TRMPBF 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 LTC2640CTS8-LZ10#TRMPBF?
For technical support, including LTC2640CTS8-LZ10#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2640CTS8-LZ10#TRMPBF requirements.
6.How does Aetrix verify that LTC2640CTS8-LZ10#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2640CTS8-LZ10#TRMPBF 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 LTC2640CTS8-LZ10#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2640CTS8-LZ10#TRMPBF?
All LTC2640CTS8-LZ10#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2640CTS8-LZ10#TRMPBF, 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 LTC2640CTS8-LZ10#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2640CTS8-LZ10#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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