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Analog Devices Inc. LTC2302IDD#PBF
- Part No.:
- LTC2302IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2302IDD#PBF.pdf
- Description:
- IC ADC 12BIT SAR 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
LTC2302IDD#PBF from Analog Devices (formerly Linear Technology) is a 1-channel, 12-bit successive approximation register (SAR) ADC with differential analog inputs (IN+, IN–), SPI/MICROWIRE-compatible serial interface, and internal conversion clock. It delivers 500ksps sampling rate, 72.8dB SINAD at 1kHz input, and operates from a single 5V supply drawing 2.8mA - optimized for precision battery-powered data acquisition in industrial sensor interfaces.
For engineers reviewing the LTC2302IDD#PBF datasheet, LTC2302IDD#PBF pinout, LTC2302IDD#PBF application, or LTC2302IDD#PBF equivalent, key selection criteria include guaranteed no missing codes, software-selectable unipolar/bipolar input ranges (0V–4.096V or ±2.048V), auto-shutdown scaling supply current from 2.8mA to 14µA, and compatibility with isolated serial links via separate OVDD (2.7V–5.25V).
Technical Context
The LTC2302IDD#PBF implements a fully differential sample-and-hold circuit followed by a 12-bit capacitive charge-redistribution DAC and SAR logic, enabling high common-mode noise rejection and precise differential measurement. Its internal conversion clock decouples timing from external SCK, allowing SCK frequencies up to 40MHz independent of sampling rate.
It supports unipolar or bipolar operation via software-configurable DIN word (6-bit), with O/S bit selecting polarity inversion on IN+/IN–. The device features separate OVDD for level-shifted digital output drive, enabling interfacing with 2.7V–5.25V logic families while maintaining 5V analog performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for control-loop stability. |
| Sampling Rate | 500ksps maximum - supports real-time monitoring of fast transients in motor control or vibration sensing. |
| SINAD | 72.8dB at fIN = 1kHz - enables >11.8 effective bits for high-fidelity signal capture in instrumentation. |
| Supply Current | 2.8mA at 500ksps; 14µA at 1ksps - auto-shutdown reduces power by 200× during idle periods in portable systems. |
| Input Range | Software-selectable: 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard reference voltages without external scaling. |
| Reference Input | 0.1V to VDD (5V), 230µA max at 500ksps - compatible with low-noise references like LT6660-4.096. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDO (Pin 1) | Three-state serial data output | Outputs previous conversion result on falling edge of SCK; enabled only when CONVST is low - enables daisy-chaining and bus sharing. |
| CONVST (Pin 2) | Conversion start trigger | Rising edge initiates conversion; must return low within 40ns for optimal timing margin - critical for deterministic latency in closed-loop systems. |
| VDD (Pin 3) | Analog/digital core supply | 4.75V–5.25V supply; bypassed with 0.1µF ceramic + 10µF tantalum - powers internal DAC, comparator, and logic. |
| IN+ / IN– (Pins 4, 5) | Differential analog inputs | Accepts fully differential signals; CMRR ≥70dB suppresses noise in noisy industrial environments. |
| VREF (Pin 6) | External reference input | 0.1V–5V range; 55pF capacitance requires 10µF + 0.1µF decoupling - sets full-scale range and directly impacts LSB size (1.0mV/LSB @ 4.096V). |
| GND (Pin 7) | Analog/digital ground | Common reference for all analog and digital circuits; must connect to solid ground plane - minimizes offset drift and noise coupling. |
| SDI (Pin 8) | Serial configuration input | Latches 6-bit DIN word on first 6 rising SCK edges - configures polarity (O/S), unipolar/bipolar mode (UNI), and enables dynamic MUX reconfiguration. |
| SCK (Pin 9) | Serial clock input | Up to 40MHz; controls SDI latching (rising edge) and SDO shifting (falling edge) - allows high-speed data transfer even with slow microcontrollers via clock stretching. |
| OVDD (Pin 10) | Digital output driver supply | 2.7V–5.25V independent supply - enables level-shifting to match host MCU I/O voltage without compromising analog accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential sample-and-hold | Reduces common-mode noise by ≥70dB - essential for accurate measurements in EMI-heavy motor drives or power converters. |
| Internal conversion clock | Decouples sampling timing from SCK frequency - eliminates jitter sensitivity and simplifies clock tree design in isolated systems. |
| Auto-shutdown current scaling | Reduces IDD from 2.8mA to 14µA as sample rate drops from 500ksps to 1ksps - extends battery life in wireless sensor nodes. |
| Separate OVDD supply | Enables 2.7V–5.25V digital output swing - interoperates with mixed-voltage systems (e.g., 3.3V FPGA + 5V analog front-end) without level shifters. |
| Software-selectable input range | Single command switches between 0V–4.096V and ±2.048V - eliminates need for external gain/offset circuitry in multi-sensor platforms. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Continuous voltage/current sensing on PLC analog input modules for temperature, pressure, and flow transmitters. IC Role / Device Role / Timing Role: Precision 12-bit digitization of conditioned 4–20mA loop signals with differential input rejecting ground-loop noise. Use Value: 72.8dB SINAD and ±0.3LSB INL ensure <0.03% measurement error across –40°C to +85°C - meets IEC 61000-4 immunity requirements. |
Use Scenario: Real-time phase current sampling in three-phase inverter gate drivers for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed (500ksps), low-latency ADC capturing motor winding currents with synchronized CONVST triggering. Use Value: 1.3µs conversion time and 240ns acquisition enable sub-microsecond current loop updates - critical for torque ripple reduction. |
| Battery-Powered Instrumentation | Isolated Data Acquisition |
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring long runtime and high DC accuracy. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with auto-shutdown and sleep mode (35µW) minimizing quiescent drain. Use Value: 14µA shutdown current extends AA battery life to >2 years in standby - validated over full industrial temperature range. |
Use Scenario: High-voltage energy metering where ADC resides on line-side, communicating via optocoupler-isolated SPI to neutral-side MCU. IC Role / Device Role / Timing Role: SPI/MICROWIRE-compatible interface with separate OVDD enabling clean isolation barrier crossing. Use Value: 40MHz SCK tolerance allows use of fast isolators (e.g., Si86xx) without clock division - preserves throughput in Class 0.2 meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; 200ksps max; no internal reference; SPI-only (no MICROWIRE); 8-pin SOIC package | Lacks auto-shutdown and differential input - requires external op-amp for differential signaling and external reference. | Choose for cost-sensitive, lower-speed designs where board space permits SOIC and external support circuitry is acceptable. |
| MAX11131ETE+ | 2.7V–3.6V supply; 500ksps; internal reference; 10-pin TDFN; –40°C to +125°C rating | Higher temp rating but narrower supply range - incompatible with 5V systems without LDO; no separate OVDD. | Choose for automotive under-hood applications needing extended temperature range, accepting 3.3V-only digital interface. |
Compared with ADS7822U and MAX11131ETE+, the LTC2302IDD#PBF uniquely combines 5V operation, differential input, auto-shutdown, and separate OVDD in a compact DFN - making it optimal for industrial 5V systems demanding noise immunity and power flexibility.
Availability
LTC2302IDD#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2302IDD#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for high-performance data converters, amplifiers, and power management ICs serving industrial, aerospace, and medical markets.
The LTC2302IDD#PBF belongs to Linear's legacy high-speed precision SAR ADC family, designed specifically for applications demanding low noise, guaranteed monotonicity, and robust operation in electrically noisy industrial environments.
FAQ
What is the operating temperature range of the LTC2302IDD#PBF?
The LTC2302IDD#PBF is rated for –40°C to +85°C, qualifying it for industrial-grade deployment in factory automation, outdoor telemetry, and motor drive enclosures. This grade is confirmed by the "I" suffix in the part number and verified in the Absolute Maximum Ratings table of the official datasheet.
Does the LTC2302IDD#PBF require an external reference voltage?
Yes, the LTC2302IDD#PBF requires an external reference applied to the VREF pin. It accepts 0.1V to 5V, with typical use at 4.096V for optimal 1mV/LSB resolution. The device draws up to 230µA from VREF at 500ksps, so the reference must be low-noise and stable under capacitive load (10µF + 0.1µF bypass).
How does the auto-shutdown feature work in the LTC2302IDD#PBF?
The LTC2302IDD#PBF automatically scales supply current based on sample rate: 2.8mA at 500ksps, 7µA at 1ksps, and 14µA in sleep mode. This is achieved through internal clock gating and bias current reduction - no software command is needed beyond controlling CONVST timing.
Can the LTC2302IDD#PBF interface directly with a 3.3V microcontroller?
Yes, via the separate OVDD pin. Set OVDD = 3.3V while maintaining VDD = 5V for analog performance. The SDO output will swing rail-to-rail between 0V and 3.3V, and SDI/SCK inputs tolerate 3.3V logic levels per VIH/VIL specs - enabling direct connection without level shifters.
What is the purpose of the exposed pad (Pin 11) on the LTC2302IDD#PBF?
The exposed pad (Pin 11) is internally connected to GND and must be soldered to a PCB ground plane. It provides critical thermal dissipation (θJA = 43°C/W) and lowers ground impedance, reducing noise coupling and improving DC accuracy - omission causes thermal throttling and increased offset drift.
LTC2302IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2302IDD#PBF FAQ
1.How can I place an order for LTC2302IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2302IDD#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 LTC2302IDD#PBF reliable?
The price and inventory of LTC2302IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2302IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2302IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2302IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2302IDD#PBF?
LTC2302IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2302IDD#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 LTC2302IDD#PBF?
For technical support, including LTC2302IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2302IDD#PBF requirements.
6.How does Aetrix verify that LTC2302IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2302IDD#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 LTC2302IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2302IDD#PBF?
All LTC2302IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2302IDD#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 LTC2302IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2302IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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