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Analog Devices Inc. LTC2302CDD#PBF
- Part No.:
- LTC2302CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2302CDD#PBF.pdf
- Description:
- IC ADC 12BIT SAR 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,001
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Product details
Overview
LTC2302CDD#PBF from Analog Devices (formerly Linear Technology) is a 1-channel, 12-bit successive approximation register (SAR) ADC with differential analog inputs (IN+, IN–), 500ksps sampling rate, 72.8dB SINAD at 1kHz, and single 5V supply operation. It serves as a precision data acquisition front-end in battery-powered instrumentation requiring low noise, low power, and SPI-compatible serial interface.
For engineers reviewing the LTC2302CDD#PBF datasheet, LTC2302CDD#PBF pinout, LTC2302CDD#PBF application, or LTC2302CDD#PBF equivalent, key selection considerations include its unipolar/bipolar software-selectable input range (0V–4.096V or ±2.048V), internal conversion clock enabling SCK up to 40MHz, auto-shutdown current scaling (2.8mA @ 500ksps → 14µA @ 1ksps), and 10-pin 3mm × 3mm DFN package with exposed ground pad.
Technical Context
The LTC2302CDD#PBF implements a fully differential sample-and-hold circuit followed by a 12-bit capacitive charge-redistribution DAC and SAR logic, supporting both unipolar and bipolar modes via 6-bit SDI configuration. Its analog input structure features 55pF input capacitance in sample mode and 5pF in hold mode, with common-mode rejection of 70dB.
It uses an SPI/MICROWIRE-compatible 4-wire serial interface (SDI, SDO, SCK, CONVST) where CONVST rising edge initiates conversion and SDO outputs prior-conversion data on SCK falling edges. The internal conversion clock decouples timing from SCK frequency, allowing flexible host controller interfacing without strict clock synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for control-loop stability and accurate waveform reconstruction. |
| Sampling Rate | 500ksps maximum - supports real-time monitoring of signals up to ~250kHz Nyquist bandwidth with adequate oversampling margin. |
| SINAD | 72.8dB at fIN = 1kHz - corresponds to ~11.8 effective bits, suitable for high-fidelity sensor digitization and industrial process feedback. |
| Supply Current | 2.8mA at 500ksps, 14µA at 1ksps - auto-shutdown enables dynamic power scaling for intermittent measurement duty cycles. |
| Input Range | Software-selectable: 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard reference voltages and accommodates AC-coupled or DC-biased transducer outputs. |
| Reference Input | VREF range: 0.1V to VDD (5V); max IREF = 260µA at 500ksps - allows use of low-noise external references like LT6660-4.096 without buffer amplification. |
| Digital Interface | SPI/MICROWIRE compatible, SCK up to 40MHz - enables direct connection to FPGAs, microcontrollers, and isolated digital links without protocol translation. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11), rated for 0°C to 70°C operating temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SDO) | Three-state serial data output | Outputs previous conversion result on SCK falling edge; enabled only when CONVST is low - enables daisy-chaining and avoids bus contention. |
| Pin 2 (CONVST) | Conversion start trigger | Rising-edge sensitive; must return low within 40ns after conversion start/end - defines precise sampling instant and synchronizes acquisition phase. |
| Pin 3 (VDD) | Analog/digital core supply | 4.75V–5.25V range; requires 0.1µF ceramic + 10µF tantalum bypass - powers internal DAC, comparator, and logic; noise sensitivity demands clean analog rail. |
| Pins 4 & 5 (IN+, IN–) | Differential analog input pair | Fully differential input with 70dB CMRR; accepts ±2.048V bipolar or 0–4.096V unipolar range - rejects common-mode noise from shared sensor grounds or EMI. |
| Pin 6 (VREF) | External reference input | 0.1V–5V range; 55pF input capacitance; requires 10µF + 0.1µF decoupling - sets full-scale voltage and directly determines LSB size (1mV/LSB at 4.096V). |
| Pin 7 (GND) | Analog/digital ground | Common reference for all analog and digital circuits; must connect to solid ground plane - critical for minimizing ground bounce and maintaining INL/DNL specs. |
| Pin 8 (SDI) | Serial data input | Latches 6-bit configuration word (O/S, UNI bits) on first 6 SCK rising edges - selects input polarity and unipolar/bipolar mode before next conversion begins. |
| Pin 9 (SCK) | Serial clock input | Accepts up to 40MHz; rising edge latches SDI, falling edge clocks SDO - decoupled from conversion timing by internal clock, simplifying host timing design. |
| Pin 10 (OVDD) | Digital output driver supply | 2.7V–5.25V independent supply for SDO - allows level-shifting to 3.3V or 5V logic families without affecting core ADC operation. |
| Pin 11 (Exposed Pad) | Thermal & electrical ground | Must be soldered to PCB ground plane - reduces θJA to 43°C/W and stabilizes reference and analog ground potentials. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential sample-and-hold | Reduces common-mode noise coupling from shared sensor grounds or switching supplies, improving measurement integrity in noisy industrial environments. |
| Auto-shutdown current scaling | Supply current drops from 2.8mA at 500ksps to 14µA at 1ksps - extends battery life in portable data loggers without firmware intervention. |
| Software-selectable unipolar/bipolar mode | Single 6-bit SDI command configures input range - eliminates need for external signal conditioning circuitry when handling AC-coupled or bidirectional transducer outputs. |
| Internal conversion clock | Decouples conversion timing from SCK frequency - permits use of low-speed microcontrollers or isolated SPI interfaces without violating tCONV (1.3–1.6µs) or tACQ (240ns) requirements. |
| Separate OVDD supply | Enables SDO output level shifting between 2.7V and 5.25V - supports mixed-voltage systems (e.g., 3.3V FPGA + 5V analog section) without level translators. |
Applications
| Battery-Operated Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Portable multimeter or handheld oscilloscope capturing sensor waveforms with 12-bit resolution and minimal power draw. IC Role / Device Role / Timing Role: Primary analog-to-digital converter front-end, performing synchronized sampling triggered by CONVST with internal clock timing. Use Value: 14µA sleep current and 2.8mA active current enable >100-hour battery life at 1ksps sampling, while 72.8dB SINAD preserves signal fidelity for diagnostic measurements. |
Use Scenario: Industrial PLC module acquiring analog sensor data across galvanic isolation barrier using optocouplers or digital isolators. IC Role / Device Role / Timing Role: SPI-compatible ADC interfaced to isolated microcontroller via SDO/SDI/SCK/CONVST lines, leveraging internal clock for timing independence. Use Value: 40MHz SCK support and 3-wire+CONVST interface minimize isolator channel count; separate OVDD allows 3.3V logic-side interfacing while maintaining 5V analog accuracy. |
| Motor Control Feedback | Accelerometer Signal Conditioning |
|
Use Scenario: Closed-loop servo drive measuring current shunt voltage or position encoder analog outputs for real-time torque/position correction. IC Role / Device Role / Timing Role: High-speed differential ADC sampling motor phase currents with precise timing alignment via CONVST edge triggering. Use Value: 500ksps rate supports >10kHz control loop bandwidth; differential IN+/IN– inputs reject common-mode noise from PWM switching transients. |
Use Scenario: Structural health monitoring node digitizing piezoelectric accelerometer outputs in vibration analysis equipment. IC Role / Device Role / Timing Role: Low-noise ADC capturing broadband mechanical vibration spectra with minimal added distortion. Use Value: 72.8dB SINAD and –88.7dB THD preserve harmonic content up to 1kHz; software-selectable bipolar mode accommodates bidirectional acceleration peaks. |
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 | 8-pin SOIC, 200ksps max, 70dB SINAD, no auto-shutdown, single-supply 2.7–5.25V | Limited to lower throughput and lower SNR; lacks differential input and software-configurable range | Select when board space allows SOIC and 200ksps suffices; avoid for battery-critical or high-SINAD applications. |
| MAX11100ETE+ | 12-bit, 500ksps, 73dB SINAD, 10-pin TDFN, but requires external reference and has no bipolar mode | Unipolar-only input; higher 3.5mA supply current at full rate; no integrated O/S bit for polarity inversion | Prefer when external reference is already present and bipolar input is unnecessary; verify layout compatibility with TDFN footprint. |
Compared with ADS7822U and MAX11100ETE+, the LTC2302CDD#PBF uniquely combines differential input, software-selectable bipolar/unipolar range, auto-shutdown, and 72.8dB SINAD in a 3mm × 3mm DFN - making it optimal for space-constrained, low-power, high-fidelity sensing where input flexibility and noise immunity are critical.
Availability
LTC2302CDD#PBF is available at Aetrix Electronics and suitable for battery-operated instrumentation, isolated data acquisition, motor control feedback, and accelerometer signal conditioning requiring stable component supply and long-term production continuity.
Supply support for LTC2302CDD#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2302CDD#PBF belongs to Linear's precision SAR ADC product line, designed specifically for high-resolution, low-power, and low-noise data acquisition in portable, isolated, and real-time control systems.
FAQ
What is the maximum sampling rate supported by the LTC2302CDD#PBF?
The LTC2302CDD#PBF supports a maximum sampling rate of 500ksps, with conversion time specified at 1.3–1.6µs and acquisition time of 240ns. This rate is achievable across the full 0°C to 70°C operating temperature range and enables accurate digitization of signals up to 250kHz under Nyquist criteria. The internal conversion clock ensures timing consistency regardless of SCK frequency.
Does the LTC2302CDD#PBF require an external reference voltage?
Yes, the LTC2302CDD#PBF requires an external reference voltage applied to the VREF pin, with a valid range of 0.1V to 5V (VDD). It does not include an internal reference. Recommended references include the LT6660-4.096 or LT1790A-4.096, both of which provide low noise and sufficient drive capability (≤260µA at 500ksps) to maintain full 12-bit performance of the LTC2302CDD#PBF.
How does the auto-shutdown feature reduce power consumption in the LTC2302CDD#PBF?
The LTC2302CDD#PBF auto-shutdown feature dynamically scales supply current with sampling rate: it draws 2.8mA at 500ksps, drops to 7µA at 1ksps, and reaches 14µA in sleep mode. This occurs automatically based on CONVST idle time - no software command is needed. For example, in a data logger sampling once per second, the LTC2302CDD#PBF spends >99.9% of time in ultra-low-current state, significantly extending battery life without firmware overhead.
Can the LTC2302CDD#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC2302CDD#PBF supports direct interfacing with 3.3V microcontrollers via its separate OVDD supply pin (Pin 10), which accepts 2.7V–5.25V. Setting OVDD = 3.3V configures SDO output levels to match 3.3V logic thresholds, while VDD remains at 5V for optimal analog performance. SDI and SCK inputs tolerate 3.3V signals since their VIH/VIL thresholds (2.4V/0.8V at VDD=5V) are met.
What is the purpose of the exposed pad (Pin 11) on the LTC2302CDD#PBF DFN package?
The exposed pad (Pin 11) on the LTC2302CDD#PBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 43°C/W and ensure stable reference and analog ground potentials. Omitting this connection degrades thermal performance, increases ground impedance, and risks violating INL/DNL and SINAD specifications due to ground bounce and noise coupling.
LTC2302CDD#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2302CDD#PBF FAQ
1.How can I place an order for LTC2302CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2302CDD#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 LTC2302CDD#PBF reliable?
The price and inventory of LTC2302CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2302CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2302CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2302CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2302CDD#PBF?
LTC2302CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2302CDD#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 LTC2302CDD#PBF?
For technical support, including LTC2302CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2302CDD#PBF requirements.
6.How does Aetrix verify that LTC2302CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2302CDD#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 LTC2302CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2302CDD#PBF?
All LTC2302CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2302CDD#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 LTC2302CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2302CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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