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Analog Devices Inc. LTC2640ACTS8-LZ12#TRPBF
- Part No.:
- LTC2640ACTS8-LZ12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2640ACTS8-LZ12#TRPBF.pdf
- Description:
- IC DAC 12BIT V-OUT TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2640ACTS8-LZ12#TRPBF from Analog Devices is a single-channel, 12-bit voltage-output DAC with integrated 2.5V precision reference (10ppm/°C), rail-to-rail output buffer, SPI/MICROWIRE™-compatible 3-wire interface, and power-on reset to zero-scale. It operates from 2.7V to 5.5V, draws only 180µA at 3V, and guarantees monotonicity over –40°C to 85°C (I-grade). Used in precision analog control loops requiring stable, low-drift DC bias generation.
For engineers reviewing the LTC2640ACTS8-LZ12#TRPBF datasheet, LTC2640ACTS8-LZ12#TRPBF pinout, LTC2640ACTS8-LZ12#TRPBF application, or LTC2640ACTS8-LZ12#TRPBF equivalent, key selection criteria include guaranteed ±1LSB INL accuracy, 4.1µs settling time to ±1LSB, 0.7mVPP (0.1Hz–200kHz) output noise, and TSOT-23-8 package compatibility with space-constrained industrial sensor interfaces and portable instrumentation.
Technical Context
The LTC2640ACTS8-LZ12#TRPBF implements a resistor-divider-based DAC architecture with double-buffered input and DAC registers, enabling glitch-free updates via Write+Update command (0b0011). Its internal 2.5V reference is buffered and available at REF pin, supporting bidirectional use as input (external reference mode) or 10ppm/°C output.
It features asynchronous hardware clear (CLR) for deterministic zero-scale initialization, power-down mode consuming ≤1.8µA (I-grade), and SPI timing compliant up to 50MHz with setup/hold times of 4ns. The device uses 24-bit serial framing: 4-bit command + 4 don't-care + 12-bit data + 4 don't-care bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-precision analog control |
| INL Error | ±1 LSB max - ensures accurate transfer function across full temperature range (–40°C to 85°C) |
| Settling Time | 4.1 µs to ±1 LSB - enables fast step response in closed-loop servo and calibration systems |
| Reference Output | 2.5 V ±0.4% FSR, 10 ppm/°C - provides stable, low-drift reference for external circuitry without added components |
| Supply Current | 180 µA at 3 V - supports battery-powered portable equipment with minimal quiescent load |
| Power-Down Current | ≤1.8 µA (I-grade) - extends system standby life in intermittent-sampling applications |
| Output Noise | 0.7 mVPP, 0.1 Hz–200 kHz - minimizes ripple in sensitive analog front-ends and sensor excitation circuits |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 3.0 mm × 1.7 mm × 0.8 mm, thermal resistance θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS/LD (1) | Chip Select / Load Input | Level-triggered active-low signal enabling SPI interface and executing command on rising edge |
| SCK (2) | Serial Clock Input | CMOS/TTL-compatible clock accepting up to 50 MHz; data latched on rising edge |
| SDI (3) | Serial Data Input | MSB-first 24-bit frame: 4-bit command + 4 don't-care + 12-bit code + 4 don't-care |
| GND (4) | Analog/Digital Ground | Common return path for VCC, REF, and VOUT; requires low-impedance PCB connection |
| VCC (5) | Positive Supply | 2.7 V to 5.5 V operation; bypass with 0.1 µF ceramic capacitor close to pin |
| REF (6) | Reference I/O | Bidirectional: outputs 2.5 V (10 ppm/°C) or accepts external 0–VCC reference to set full-scale |
| VOUT (7) | Analog Voltage Output | Rail-to-rail buffered output capable of sourcing/sinking ±10 mA; monotonic over temperature |
| CLR (8) | Asynchronous Clear | Active-low level-triggered reset forcing DAC output to zero-scale regardless of register state |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5V Reference | 10 ppm/°C drift enables standalone operation without external reference IC or trimming |
| Guaranteed Monotonicity | Ensures no code-to-code output reversal across –40°C to 85°C, critical for control stability |
| Double-Buffered Registers | Prevents partial updates; allows seamless Write+Update command to avoid output glitches |
| Hardware CLR Pin | Provides deterministic zero-scale initialization independent of SPI communication or software state |
| Low-Power Power-Down Mode | Reduces supply current to ≤1.8 µA while preserving register contents for rapid wake-up |
Applications
| Industrial Process Control | Portable Test Equipment |
|---|---|
Use Scenario: Generating precise 4–20 mA loop bias voltages in PLC analog output modules. IC Role / Device Role / Timing Role: Voltage-output DAC providing calibrated DC setpoint to op-amp current converter stage. Use Value: ±1 LSB INL and 10 ppm/°C reference ensure <0.025% FSR error over industrial temperature range without recalibration. | Use Scenario: Setting variable reference levels in handheld multimeters and calibrators. IC Role / Device Role / Timing Role: Precision DC voltage source for ADC reference scaling and offset trimming. Use Value: 4.1 µs settling and 0.7 mVPP noise support fast, low-noise measurements in battery-operated field tools. |
| Optical Transceiver Biasing | Automotive Sensor Conditioning |
Use Scenario: Controlling laser diode bias current in SFP+ and QSFP modules. IC Role / Device Role / Timing Role: Stable analog control voltage for TEC and laser driver bias circuits. Use Value: Rail-to-rail output and 2.7–5.5 V supply range simplify integration into compact optical subassemblies. | Use Scenario: Providing programmable excitation voltage for RTD and strain gauge bridges. IC Role / Device Role / Timing Role: Low-drift, low-noise analog stimulus generator in automotive cabin sensor nodes. Use Value: Guaranteed operation to 85°C and 180 µA supply current meet AEC-Q200-relevant embedded requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4922-E/SL | 12-bit, dual-channel, SPI interface, no internal reference (requires external 2.5V ref), ±2 LSB INL | Requires external reference and layout area; better suited for dual-output systems | Select when dual DAC channels and lower cost outweigh need for integrated reference and tighter INL |
| AD5620BRJZ-REEL7 | 12-bit, single-channel, internal 2.5V ref (10 ppm/°C), SPI interface, ±1 LSB INL, same TSOT-23-8 package | Identical functional scope and accuracy; differs in power-down behavior and CLR implementation | Choose for pin-compatible second-source option where ADI and Analog Devices supply chain diversification is required |
Compared with MCP4922-E/SL and AD5620BRJZ-REEL7, the LTC2640ACTS8-LZ12#TRPBF offers guaranteed monotonicity over temperature and hardware CLR-critical for fail-safe industrial control-while maintaining identical 12-bit resolution, 2.5V reference, and TSOT-23 footprint.
Availability
LTC2640ACTS8-LZ12#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, optical transceiver biasing, and automotive sensor conditioning requiring stable component supply and long-term production continuity.
Supply support for LTC2640ACTS8-LZ12#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, 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 series was designed as a family of compact, low-power, high-accuracy voltage-output DACs targeting space- and power-constrained embedded systems needing integrated precision references and robust SPI control.
FAQ
What is the full-scale output voltage of the LTC2640ACTS8-LZ12#TRPBF in internal reference mode?
The LTC2640ACTS8-LZ12#TRPBF delivers a full-scale output voltage of 2.5 V in internal reference mode, derived from its integrated 10 ppm/°C precision reference. This value is specified as 2.5 V × (4095/4096) = 2.49939 V typical, with ±0.4% full-scale error over temperature. External reference mode allows user-defined full-scale by applying 0–VCC to the REF pin.
Does the LTC2640ACTS8-LZ12#TRPBF support true rail-to-rail output swing?
Yes, the LTC2640ACTS8-LZ12#TRPBF features a rail-to-rail output buffer that drives VOUT from within 10 mV of GND to within 10 mV of VCC across the full operating temperature range. This capability is confirmed in the datasheet's "DC Performance" section and enables direct interfacing with op-amps and ADCs operating at the supply rails.
How does the power-on reset behavior of the LTC2640ACTS8-LZ12#TRPBF differ from mid-scale reset variants?
The LTC2640ACTS8-LZ12#TRPBF resets to zero-scale (code 0x000) on power-up, enforced by its "Z" suffix designation. Unlike mid-scale reset variants (e.g., LTC2640A-LM12), this ensures deterministic startup at 0 V output-critical for safety-critical analog control paths where nonzero initial conditions could trigger false alarms or actuator movement.
Can the REF pin of the LTC2640ACTS8-LZ12#TRPBF be used simultaneously as input and output?
No-the REF pin of the LTC2640ACTS8-LZ12#TRPBF operates in one mode at a time: either as an output (internal reference enabled) or as an input (external reference selected). Mode selection is fixed at power-up by the part number variant (LZ = internal 2.5V); software cannot dynamically switch modes. The pin must not be driven externally while in internal reference mode.
What is the maximum SPI clock frequency supported by the LTC2640ACTS8-LZ12#TRPBF?
The LTC2640ACTS8-LZ12#TRPBF supports SPI clock frequencies up to 50 MHz, with minimum SCK high/low times of 9 ns each and setup/hold times of 4 ns. This timing is guaranteed over the full operating temperature range (–40°C to 85°C) and enables high-throughput configuration in real-time control systems without requiring clock dividers or wait states.
LTC2640ACTS8-LZ12#TRPBF 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:
- 12
- Number of D/A Converters:
- 1
- Settling Time:
- 4.1µs (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):
- ±0.5, ±1 (Max)
- Architecture:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2640ACTS8-LZ12#TRPBF FAQ
1.How can I place an order for LTC2640ACTS8-LZ12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2640ACTS8-LZ12#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 LTC2640ACTS8-LZ12#TRPBF reliable?
The price and inventory of LTC2640ACTS8-LZ12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2640ACTS8-LZ12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2640ACTS8-LZ12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2640ACTS8-LZ12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2640ACTS8-LZ12#TRPBF?
LTC2640ACTS8-LZ12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2640ACTS8-LZ12#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 LTC2640ACTS8-LZ12#TRPBF?
For technical support, including LTC2640ACTS8-LZ12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2640ACTS8-LZ12#TRPBF requirements.
6.How does Aetrix verify that LTC2640ACTS8-LZ12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2640ACTS8-LZ12#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 LTC2640ACTS8-LZ12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2640ACTS8-LZ12#TRPBF?
All LTC2640ACTS8-LZ12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2640ACTS8-LZ12#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 LTC2640ACTS8-LZ12#TRPBF part is unused and in its original packaging.
Return procedure for LTC2640ACTS8-LZ12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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