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Analog Devices Inc. LTC2640ITS8-LZ10#TRPBF
- Part No.:
- LTC2640ITS8-LZ10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2640ITS8-LZ10#TRPBF.pdf
- Description:
- IC DAC 10BIT V-OUT TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,261
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Product details
Overview
LTC2640ITS8-LZ10#TRPBF from Analog Devices is a 10-bit voltage-output DAC with integrated 2.5V ±10ppm/°C reference, rail-to-rail output buffer, SPI/MICROWIRE™-compatible 3-wire interface, and power-on reset to zero-scale. It operates from a single 2.7V–5.5V supply, delivers ±1LSB INL (max), settles in 3.8µs to ±1LSB, and draws only 180µA at 3V - ideal for precision analog control in portable instrumentation.
For engineers reviewing the LTC2640ITS8-LZ10#TRPBF datasheet, LTC2640ITS8-LZ10#TRPBF pinout, LTC2640ITS8-LZ10#TRPBF application, or LTC2640ITS8-LZ10#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating conditions, real-world application mappings, and two rigorously cross-checked alternative part options.
Technical Context
The LTC2640ITS8-LZ10#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 temperature-stable (±10ppm/°C), and the output stage guarantees monotonicity across –40°C to 125°C (H-grade).
It supports both Internal Reference mode (2.5V full-scale) and External Reference mode (0V to VCC), with bidirectional REF pin functionality. The 24-bit serial frame includes 4-bit command, 4 don't-care bits, and 10-bit data + 6 don't-care bits - compatible with standard SPI controllers at up to 50MHz SCK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output levels with guaranteed monotonicity over temperature. |
| Full-Scale Output | 2.5V (internal reference) - fixed, low-drift reference enables absolute voltage accuracy without external components. |
| INL Error | ±1LSB max - ensures end-point linearity critical for closed-loop control and calibration systems. |
| Settling Time | 3.8µs to ±1LSB - supports high-speed waveform generation and dynamic biasing in ATE and optical modules. |
| Supply Current | 180µA at 3V - enables battery-powered operation with minimal impact on system power budget. |
| Power-Down Current | 1.8µA max (H-grade) - allows deep sleep between measurement cycles in portable sensors. |
| Reference Tempco | ±10ppm/°C - maintains <±0.025% full-scale drift over –40°C to 125°C, eliminating recalibration needs. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 3mm × 1.75mm footprint, 0.65mm pitch, thermal resistance θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS/LD (Pin 1) | Serial interface chip select / load enable | Level-triggered active-low signal that enables SCK/SDI and executes command on rising edge. |
| SCK (Pin 2) | Serial clock input | CMOS/TTL-compatible clock accepting up to 50MHz; data latched on rising edge. |
| SDI (Pin 3) | Serial data input | MSB-first 24-bit frame: 4-bit command + 4 don't-care + 10-bit code + 6 don't-care bits. |
| GND (Pin 4) | Analog/digital ground reference | Single ground connection; requires low-impedance return path for reference and output stability. |
| VCC (Pin 5) | Positive supply input | 2.7V–5.5V operation; bypass with 0.1µF ceramic capacitor close to pin for noise immunity. |
| REF (Pin 6) | Bidirectional reference I/O | Outputs 2.5V internal reference (±10ppm/°C); accepts 0V–VCC external reference for scaling flexibility. |
| VOUT (Pin 7) | Analog voltage output | Rail-to-rail buffered output capable of sourcing/sinking ±28mA; stable into 500pF capacitive loads. |
| CLR (Pin 8) | Asynchronous clear input | Active-low level-triggered reset forcing DAC output to zero-scale regardless of register state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5V reference | Eliminates need for external precision reference IC or resistor divider, reducing BOM count and layout area. |
| Zero-scale power-on reset | Ensures deterministic startup behavior - critical for safety-critical systems where undefined initial output is unacceptable. |
| Guaranteed monotonicity | Prevents output reversal during code transitions, essential for control loop stability in motor drivers and PID circuits. |
| Low 0.7mVPP noise (0.1Hz–200kHz) | Supports high-resolution measurements in sensitive analog front-ends without added filtering overhead. |
| Double-buffered registers | Enables seamless update of DAC output without intermediate glitches - vital for continuous waveform synthesis. |
Applications
| Process Control Loop | Portable Instrumentation |
|---|---|
|
Use Scenario: Generating precise 4–20mA transmitter bias voltages in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Voltage-output DAC setting reference for current-sense amplifier and op-amp feedback network. Use Value: ±1LSB INL and ±10ppm/°C reference ensure <±0.1% full-scale error over temperature - meeting SIL-2 functional safety margin requirements. |
Use Scenario: Setting programmable gain and offset in handheld multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: Precision DC bias generator for ADC driver stages and sensor excitation circuits. Use Value: 3.8µs settling time and rail-to-rail output allow fast range switching without dead time, improving measurement throughput. |
| Automotive Sensor Calibration | Optical Transceiver Bias |
|
Use Scenario: Providing factory-trimmed reference voltages for MEMS pressure and temperature sensor compensation. IC Role / Device Role / Timing Role: Nonvolatile trim DAC emulating precision resistor networks in ECU calibration memory. Use Value: H-grade (–40°C to 125°C) operation and zero-scale POR guarantee repeatable startup across engine bay thermal cycles. |
Use Scenario: Controlling laser diode bias current in SFP+ and QSFP transceivers via current-source DAC interface. IC Role / Device Role / Timing Role: Stable 2.5V reference source feeding external current mirror or transconductance amplifier. Use Value: 0.7mVPP broadband noise and 10ppm/°C tempco prevent optical power drift and bit-error-rate degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4921-E/SN | 12-bit, external reference only, no integrated ref, 2.7–5.5V supply, ±2LSB INL, SPI interface | Lacks internal reference and zero-scale POR - requires external 2.5V ref and POR circuitry for equivalent functionality | Select when higher resolution is needed and board space allows external reference; not drop-in for reference-integrated designs |
| AD5620BRJZ-REEL7 | 12-bit, internal 2.5V ref (±10ppm/°C), SPI, 2.7–5.5V, ±1LSB INL, but no CLR pin or zero-scale POR | Missing asynchronous clear and deterministic zero-startup - unsuitable for safety-critical or reset-sensitive systems | Choose for higher resolution where startup state is managed externally; verify system-level reset coordination |
Compared with MCP4921-E/SN and AD5620BRJZ-REEL7, the LTC2640ITS8-LZ10#TRPBF uniquely combines 10-bit precision, integrated 2.5V reference, zero-scale power-on reset, and asynchronous clear - delivering a self-contained, safety-aware DAC solution with no external support components required.
Availability
LTC2640ITS8-LZ10#TRPBF is available at Aetrix Electronics and suitable for process control loops, portable instrumentation, automotive sensor calibration, and optical transceiver bias requiring stable component supply, long-term lifecycle support, and guaranteed H-grade temperature performance.
Supply support for LTC2640ITS8-LZ10#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2640 family was designed specifically for space-constrained, low-power precision analog control applications - delivering integrated reference, rail-to-rail output, and robust SPI interface in an 8-lead TSOT-23 package.
FAQ
What is the full-scale output voltage of the LTC2640ITS8-LZ10#TRPBF in internal reference mode?
The LTC2640ITS8-LZ10#TRPBF has a fixed full-scale output voltage of 2.5V when operating in internal reference mode. This value is derived from its integrated 2.5V reference with ±10ppm/°C temperature coefficient, ensuring stable scaling across –40°C to 125°C without external components.
Does the LTC2640ITS8-LZ10#TRPBF support external reference operation?
Yes, the LTC2640ITS8-LZ10#TRPBF supports external reference operation via the REF pin (Pin 6), which accepts input voltages from 0V to VCC. In this mode, the full-scale output becomes equal to the applied external reference voltage, enabling flexible scaling for applications requiring non-standard output ranges.
What is the purpose of the CLR pin on the LTC2640ITS8-LZ10#TRPBF?
The CLR (Pin 8) on the LTC2640ITS8-LZ10#TRPBF is an asynchronous, level-triggered clear input. When driven low, it forces the DAC output to zero-scale immediately - independent of clock or register state - providing deterministic reset capability for fault recovery and system initialization sequences.
What is the maximum SPI clock frequency supported by the LTC2640ITS8-LZ10#TRPBF?
The LTC2640ITS8-LZ10#TRPBF supports SPI clock frequencies up to 50MHz with 50% duty cycle, as specified in its timing characteristics. This high-speed interface enables rapid updates in real-time control and waveform generation applications while maintaining compatibility with standard microcontroller SPI peripherals.
How does the power-on reset behavior of the LTC2640ITS8-LZ10#TRPBF differ from mid-scale reset variants?
The LTC2640ITS8-LZ10#TRPBF features zero-scale power-on reset (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., LTC2640ITS8-LM10#TRPBF), which initialize to 1.25V - making the LTC2640ITS8-LZ10#TRPBF preferred for systems requiring guaranteed safe startup states.
LTC2640ITS8-LZ10#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:
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2640ITS8-LZ10#TRPBF FAQ
1.How can I place an order for LTC2640ITS8-LZ10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2640ITS8-LZ10#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 LTC2640ITS8-LZ10#TRPBF reliable?
The price and inventory of LTC2640ITS8-LZ10#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2640ITS8-LZ10#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2640ITS8-LZ10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2640ITS8-LZ10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2640ITS8-LZ10#TRPBF?
LTC2640ITS8-LZ10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2640ITS8-LZ10#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 LTC2640ITS8-LZ10#TRPBF?
For technical support, including LTC2640ITS8-LZ10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2640ITS8-LZ10#TRPBF requirements.
6.How does Aetrix verify that LTC2640ITS8-LZ10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2640ITS8-LZ10#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 LTC2640ITS8-LZ10#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2640ITS8-LZ10#TRPBF?
All LTC2640ITS8-LZ10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2640ITS8-LZ10#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 LTC2640ITS8-LZ10#TRPBF part is unused and in its original packaging.
Return procedure for LTC2640ITS8-LZ10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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