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Analog Devices Inc. LTC2645HMS-L8#TRPBF
- Part No.:
- LTC2645HMS-L8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2645HMS-L8#TRPBF.pdf
- Description:
- IC DAC 8BIT V-OUT 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
LTC2645HMS-L8#TRPBF from Analog Devices is a quad 8-bit PWM-to-voltage output DAC with integrated 10ppm/°C reference, rail-to-rail buffered outputs, and guaranteed monotonicity in a 16-lead MSOP package. It converts PWM inputs (100kHz max) to stable analog voltage outputs (0–2.5V full-scale), settles within 7.8µs, sources/sinks ±5mA at 3V, and operates from –40°C to 125°C for automotive process control and trimming applications.
For engineers reviewing the LTC2645HMS-L8#TRPBF datasheet, LTC2645HMS-L8#TRPBF pinout, LTC2645HMS-L8#TRPBF application, or LTC2645HMS-L8#TRPBF equivalent, key selection criteria include 8-bit resolution with ±0.5LSB DNL, idle-mode configuration via IDLSEL, internal/external reference selection via REFSEL, and support for discontinuous PWM input in sample/hold mode.
Technical Context
The LTC2645HMS-L8#TRPBF implements four independent PWM-to-binary converters that compute duty cycle (tPWH/tPER) after each rising edge on INA–IND, then update corresponding VOUTA–VOUTD within 3.2µs computational delay plus 7.8µs total settling time. It supports transparent operation (IDLSEL = GND) for 0%/100% duty cycle handling and sample/hold mode (IDLSEL = VCC) for indefinite voltage retention.
Reference selection is hardware-configured: REFSEL = GND enables the 1.25V internal reference (amplified to 2.5V full-scale) with 10ppm/°C drift; REFSEL = VCC enables external reference input (1V to VCC), reducing supply current and scaling full-scale output linearly. Power-down is activated by pulling PD low (<1µA ISD) or holding any PWM input low >60ms in sample/hold mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output levels with ±0.5LSB differential nonlinearity guarantee |
| Full-Scale Output | 2.5V (internal ref) or user-defined (external ref) - sets absolute voltage range for all four DAC channels |
| Settling Time | 7.8µs to ±1LSB - enables real-time closed-loop response in fast industrial feedback systems |
| PWM Input Frequency | 30Hz to 100kHz - supports high-speed digital control signals without external filtering |
| Output Drive | ±5mA at 3V - eliminates need for external buffer amplifiers in moderate-load instrumentation circuits |
| Temperature Range | –40°C to 125°C - qualified for under-hood automotive and harsh industrial environments |
| Reference Drift | 10ppm/°C - ensures <±0.3% full-scale error over full temperature range with internal reference |
Pinout & Package
Package: 16-lead MSOP (4mm × 4.9mm), surface-mount, RoHS-compliant, rated for 150°C maximum junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 2.7V–5.5V main power; bypass required with 0.1µF capacitor to GND for noise immunity |
| VOUTA–VOUTD (Pins 2,3,14,15) | Analog voltage outputs | Rail-to-rail buffered DAC outputs; each independently updated per corresponding PWM rising edge |
| INA–IND (Pins 6,5,11,10) | PWM input channels | Accept 1.71V–5.5V logic-level PWM; duty cycle measured between consecutive rising edges |
| IOVCC (Pin 7) | Digital I/O supply | 1.71V–5.5V supply for input logic thresholds; separate from VCC to support mixed-voltage systems |
| IDLSEL (Pin 4) | Idle mode select | GND = transparent mode (zero/full-scale on idle low/high); VCC = sample/hold mode (hold or power-down) |
| PD (Pin 9) | Active-low power-down | Pulling low reduces total supply current to <1µA; resumes normal operation on high transition |
| REFSEL (Pin 13) | Reference select | GND = internal 1.25V ref (2.5V FS); VCC = external reference input (1V to VCC) |
| REF (Pin 12) | Reference I/O | Output of 1.25V internal ref (when REFSEL = GND) or input for external ref voltage (when REFSEL = VCC) |
| GND (Pins 8,16) | Analog/digital ground | Common return path; requires low-impedance PCB connection to minimize output impedance impact |
Key Features
| Feature | Design Value |
|---|---|
| No-latency PWM conversion | Updates DAC output within 7.8µs of PWM rising edge-replaces slow RC filters and op-amp integrators |
| Configurable idle behavior | Selectable zero-scale, full-scale, hold, or high-impedance power-down state when PWM stalls >60ms |
| Internal precision reference | 10ppm/°C drift, 1.25V output (2.5V FS) - eliminates external reference IC and saves board space |
| Rail-to-rail output drive | Sources/sinks ±5mA at 3V - directly drives 2kΩ loads without external buffers in calibration circuits |
| Discontinuous PWM support | Sample/hold mode retains last output indefinitely - enables burst-mode control in low-power systems |
Applications
| Automotive Sensor Calibration | Industrial Process Trimming |
|---|---|
Use Scenario: Calibrating offset/gain of pressure or temperature sensors in engine control units under wide temperature swings. IC Role / Device Role / Timing Role: Quad DAC provides four independent trim voltages for sensor signal conditioning paths; updates synchronously with ECU PWM commands. Use Value: 10ppm/°C reference stability maintains calibration accuracy across –40°C to 125°C, eliminating recalibration cycles. | Use Scenario: Adjusting setpoints and feedback gains in PLC-based motor control and valve positioning systems. IC Role / Device Role / Timing Role: LTC2645HMS-L8#TRPBF acts as programmable analog output module, converting fieldbus-generated PWM into precise DC control voltages. Use Value: 7.8µs settling enables real-time response to changing process demands without analog filter delay. |
| Medical Instrument Level Setting | Test Equipment Signal Generation |
Use Scenario: Generating stable bias and reference voltages for analog front-ends in portable diagnostic devices. IC Role / Device Role / Timing Role: Four-channel voltage source supplies calibrated excitation and offset for ADC drivers and transimpedance amplifiers. Use Value: Internal 2.5V reference and ±0.5LSB DNL ensure repeatable measurement accuracy without external precision components. | Use Scenario: Providing programmable DC offsets and amplitude controls in automated test equipment stimulus modules. IC Role / Device Role / Timing Role: LTC2645HMS-L8#TRPBF serves as digitally controlled analog output stage, accepting PWM from FPGA timing controllers. Use Value: Sample/hold mode allows static voltage generation from single-shot PWM triggers, simplifying test sequence timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM-to-voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4725-E/CH | I²C interface, single 12-bit DAC, no integrated reference, 500µs settling, 2.7–5.5V supply | Requires microcontroller I²C master; lacks PWM-native input and idle-mode flexibility | Choose when serial bus control is preferred over PWM and lower resolution is acceptable |
| AD5689RBCPZ-RL7 | Quad 16-bit SPI DAC, internal 2.5V ref (5ppm/°C), 8µs settling, 2.7–5.5V supply | Requires SPI host; higher resolution but no native PWM input-needs external PWM-to-digital conversion | Choose when highest linearity (±0.5LSB INL) and lowest drift are critical, and PWM interface is not required |
Compared with MCP4725-E/CH and AD5689RBCPZ-RL7, the LTC2645HMS-L8#TRPBF uniquely integrates direct PWM acceptance, configurable idle states, and automotive-grade temperature operation-making it optimal for embedded systems where PWM is the native control signal and thermal robustness is mandatory.
Availability
LTC2645HMS-L8#TRPBF is available at Aetrix Electronics and suitable for automotive sensor calibration, industrial process trimming, and medical instrument level setting requiring stable component supply across extended temperature ranges.
Supply support for LTC2645HMS-L8#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 LTC2645 family was designed specifically for direct replacement of analog RC filters and op-amp integrators in PWM-driven systems, enabling compact, low-latency, and thermally stable voltage generation in space-constrained embedded applications.
FAQ
What is the maximum PWM input frequency supported by the LTC2645HMS-L8#TRPBF?
The LTC2645HMS-L8#TRPBF supports PWM input frequencies up to 100kHz for its 8-bit variant. This is specified in the Electrical Characteristics table under fMAX for LTC2645-L8. Operation above this frequency degrades resolution and accuracy, and pulses narrower than tPWH (25ns min) may be interpreted as zero-scale. The device guarantees performance only within the 30Hz–100kHz range.
How does the LTC2645HMS-L8#TRPBF handle missing or stalled PWM signals?
The LTC2645HMS-L8#TRPBF enters a configurable idle state if no PWM rising edge occurs for longer than t3 (50–70ms). The behavior-zero-scale, full-scale, hold, or high-impedance power-down-is selected by the logic level on IDLSEL (Pin 4). When IDLSEL = GND, idle low forces zero-scale and idle high forces full-scale (transparent mode); when IDLSEL = VCC, it enables sample/hold or power-down. This prevents undefined output states during communication loss.
Can the LTC2645HMS-L8#TRPBF operate with an external reference voltage?
Yes, the LTC2645HMS-L8#TRPBF supports external reference operation. Connect REFSEL (Pin 13) to VCC to enable external mode, then apply a stable voltage between 1V and VCC to the REF pin (Pin 12). In this mode, the full-scale output becomes equal to the applied reference voltage, and supply current decreases. The internal 1.25V reference is disabled, and REF pin input impedance is 120–200kΩ.
What is the output settling time specification for the LTC2645HMS-L8#TRPBF?
The LTC2645HMS-L8#TRPBF settles to ±1LSB (±0.39%) of final value within 7.8µs after each PWM input rising edge, as specified in the AC Performance section for the LTC2645-L8 variant. This includes both computational delay (t4 = 3.2µs typ) and analog output settling. Load conditions are defined as 2kΩ || 100pF to GND; heavier capacitive loads (>500pF) or resistive loads outside ±5mA may increase settling time.
Does the LTC2645HMS-L8#TRPBF require external passive components for basic operation?
The LTC2645HMS-L8#TRPBF requires only two external 0.1µF bypass capacitors-one from VCC to GND (Pin 1) and one from IOVCC to GND (Pin 7)-for stable operation. No external RC filters, op-amps, or reference ICs are needed. The REF pin may optionally use up to 10µF capacitance to improve noise performance, but 0.1µF is sufficient for most applications. Board layout must maintain separate analog/digital ground regions with low-impedance GND connections.
LTC2645HMS-L8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 4
- Settling Time:
- 7µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- PWM
- 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:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2645HMS-L8#TRPBF FAQ
1.How can I place an order for LTC2645HMS-L8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2645HMS-L8#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 LTC2645HMS-L8#TRPBF reliable?
The price and inventory of LTC2645HMS-L8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2645HMS-L8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2645HMS-L8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2645HMS-L8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2645HMS-L8#TRPBF?
LTC2645HMS-L8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2645HMS-L8#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 LTC2645HMS-L8#TRPBF?
For technical support, including LTC2645HMS-L8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2645HMS-L8#TRPBF requirements.
6.How does Aetrix verify that LTC2645HMS-L8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2645HMS-L8#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 LTC2645HMS-L8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2645HMS-L8#TRPBF?
All LTC2645HMS-L8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2645HMS-L8#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 LTC2645HMS-L8#TRPBF part is unused and in its original packaging.
Return procedure for LTC2645HMS-L8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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