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Analog Devices Inc. LTC2306IDD#PBF
- Part No.:
- LTC2306IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2306IDD#PBF.pdf
- Description:
- IC ADC 12BIT SAR 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,796
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Product details
Overview
LTC2306IDD#PBF from Analog Devices (formerly Linear Technology) is a 2-channel, 12-bit successive approximation register (SAR) ADC with SPI/MICROWIRE-compatible serial interface, operating at 500ksps sampling rate on a single 5V supply. It features fully differential sample-and-hold, software-selectable unipolar/bipolar input ranges (0V–4.096V or ±2.048V), and internal conversion clock - enabling high-accuracy data acquisition in battery-powered industrial sensors and isolated remote monitoring systems.
For engineers reviewing the LTC2306IDD#PBF datasheet, LTC2306IDD#PBF pinout, LTC2306IDD#PBF application, or LTC2306IDD#PBF equivalent, key selection considerations include its guaranteed no-missing-codes performance, 72.8dB SINAD at 1kHz, 14µA auto-shutdown current at 1ksps, and compatibility with external references from 0.1V to 5.25V - all within a compact 10-pin 3mm × 3mm DFN package rated for –40°C to +85°C.
Technical Context
The LTC2306IDD#PBF implements a capacitive charge-redistribution SAR architecture with a 2-channel analog multiplexer supporting both single-ended (CH0/GND, CH1/GND) and differential (CH0/CH1) configurations via 6-bit SPI command word. Its fully differential sample-and-hold reduces common-mode noise, while the internal conversion clock decouples timing from SCK frequency (up to 40MHz).
It supports separate output driver supply OVDD (2.7V–5.25V), enabling level-shifting to microcontrollers or FPGAs with lower I/O voltages. The device achieves 71dB minimum SINAD and –88dB typical THD over full temperature range, with channel-to-channel isolation of –109dB - critical for simultaneous sampling in motor control feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for closed-loop control stability. |
| Sampling Rate | 500ksps maximum - supports real-time acquisition of signals up to 250kHz Nyquist bandwidth. |
| SINAD | 72.8dB typical at fIN = 1kHz - enables >11.8 effective bits for precision sensor digitization. |
| Input Range | Software-selectable: 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard reference ICs like LT6660-4.096. |
| Supply Current | 2.8mA at 500ksps; 14µA in auto-shutdown at 1ksps - extends battery life in portable instrumentation. |
| Reference Input | 0.1V to VDD (max 5.25V); 230µA max draw at 500ksps - allows flexible external reference selection without buffering. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: SDO | Three-state serial data output | Outputs previous conversion result on falling edge of SCK; enabled only when CONVST is low - prevents bus contention in multi-device SPI systems. |
| Pin 2: CONVST | Conversion start trigger | Rising-edge initiated; must return low within 40ns after conversion start/end - defines precise sampling instant for time-critical measurements. |
| Pin 3: VDD | Analog/digital core supply | 4.75V–5.25V operation; requires 0.1µF ceramic + 10µF tantalum bypass - ensures stable internal reference and DAC performance. |
| Pin 4: CH0 | Channel 0 analog input | Configurable as single-ended (vs GND) or differential (vs CH1); 55pF input capacitance in sample mode - dictates RC filter design for settling within 240ns acquisition window. |
| Pin 5: CH1 | Channel 1 analog input | Paired with CH0 for differential operation; matched unipolar full-scale error ≤ ±3LSB - enables accurate ratiometric measurements across channels. |
| Pin 6: VREF | External reference input | Accepts 0.1V–5.25V reference; 55pF input capacitance requires 10µF + 0.1µF decoupling - stabilizes reference against switching transients during conversion. |
| Pin 7: GND | Analog/digital ground | Common return for VDD, OVDD, VREF, and analog inputs; exposed pad (Pin 11) must be soldered to PCB ground plane - minimizes thermal resistance (θJA = 43°C/W) and noise coupling. |
| Pin 8: SDI | Serial data input | Latches 6-bit configuration word (S/D, O/S, UNI bits) on first 6 SCK rising edges - selects input mode, polarity, and range before next conversion begins. |
| Pin 9: SCK | Serial clock input | Supports up to 40MHz; timing independent of conversion clock - enables high-speed data reads without constraining system MCU clock domain. |
| Pin 10: OVDD | Output driver supply | 2.7V–5.25V logic-level supply for SDO/SDI; isolates digital I/O noise from analog section - permits interfacing with 3.3V or 5V controllers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-shutdown scaling | Reduces supply current from 2.8mA (500ksps) to 14µA (1ksps) - eliminates need for external power gating in duty-cycled sensing nodes. |
| Software-configurable input modes | Single-ended (CH0/GND or CH1/GND) or differential (CH0/CH1) via SPI command - enables flexible signal routing without hardware changes. |
| Separate OVDD supply | Allows independent 2.7V–5.25V logic voltage for SDO/SDI - simplifies integration with mixed-voltage SoCs and FPGA I/O banks. |
| High channel isolation | –109dB channel-to-channel crosstalk at 1kHz - preserves signal integrity when measuring high-gain, low-level differential sensor outputs. |
| Low acquisition time | 240ns minimum tACQ - supports fast settling even with moderate source impedances (<1kΩ) and minimal external filtering. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Continuous voltage/current measurement from 4–20mA transmitters and RTD bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling ADC capturing synchronized process variables for PID loop execution at 1–10ms intervals. Use Value: Bipolar ±2.048V input range matches standard industrial signal conditioning; 72.8dB SINAD ensures <0.025% measurement uncertainty over temperature. |
Use Scenario: Real-time phase current sensing in three-phase inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: High-speed 2-channel acquisition capturing complementary current waveforms with <10ns inter-channel skew. Use Value: –109dB channel isolation prevents cross-talk between high-dv/dt phases; 240ns acquisition time enables accurate current reconstruction at 20kHz PWM frequencies. |
| Battery-Powered Sensor Nodes | Isolated Remote Data Acquisition |
|
Use Scenario: Portable vibration analyzers and handheld multimeters powered by Li-ion batteries with 10+ hour runtime requirements. IC Role / Device Role / Timing Role: Low-power ADC managing adaptive sampling - 500ksps burst mode for FFT analysis, then auto-shutdown to 14µA idle current. Use Value: 14µA shutdown current extends battery life; 3mm × 3mm DFN footprint minimizes PCB area in space-constrained enclosures. |
Use Scenario: High-voltage grid monitoring where analog front-end resides on primary side and digital interface connects via optocoupler or digital isolator. IC Role / Device Role / Timing Role: SPI-based ADC interfacing across isolation barrier using 4-wire protocol - SDO, SDI, SCK, CONVST - with OVDD referenced to isolated side. Use Value: SPI/MICROWIRE compatibility eliminates need for custom protocol translation; separate OVDD allows direct connection to isolated 3.3V rail without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit resolution, 1MSPS, SPI interface; requires external reference; no auto-shutdown; 10-pin VSSOP package | Higher resolution for precision metrology; lacks integrated sample-and-hold and bipolar range support | Select when >12-bit ENOB is required and system can accommodate larger layout footprint and higher power. |
| MAX11106ETE+ | 12-bit, 500ksps, 2-channel, SPI; internal reference; 10-pin TDFN; operates from 2.7V–3.6V only | Lower supply voltage range limits use with 5V sensor signal chains; no software-selectable bipolar mode | Choose for 3.3V-only systems needing internal reference simplicity, but verify input range compatibility with signal sources. |
Compared with ADS8860IDRCT and MAX11106ETE+, the LTC2306IDD#PBF uniquely combines 5V operation, software-configurable bipolar/unipolar input, auto-shutdown, and guaranteed no-missing-codes in a thermally efficient DFN - making it optimal for industrial battery-powered and isolated acquisition where signal flexibility and power efficiency are co-prioritized.
Availability
LTC2306IDD#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and battery-powered sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2306IDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2306IDD#PBF belongs to Linear's precision SAR ADC product line, designed specifically for high-fidelity data acquisition in industrial, medical, and test equipment where low noise, guaranteed linearity, and robust operation across temperature are essential.
FAQ
What input configurations does the LTC2306IDD#PBF support?
The LTC2306IDD#PBF supports four analog input configurations via its 6-bit SPI command word: single-ended CH0 vs GND, single-ended CH1 vs GND, differential CH0 vs CH1 with CH0 positive, and differential CH0 vs CH1 with CH1 positive. Unipolar mode (0V–4.096V) is required for single-ended operation since inputs are referenced to GND; bipolar mode (±2.048V) is used for differential measurements. Each configuration is selected dynamically before each conversion.
How does the auto-shutdown feature work in the LTC2306IDD#PBF?
The LTC2306IDD#PBF automatically scales supply current based on sampling rate: 2.8mA at 500ksps, ~700µA at 10ksps, and 14µA at 1ksps. This occurs without external control - the internal circuitry detects conversion interval and powers down non-essential blocks during idle periods. No configuration register write is needed; behavior is inherent to the part's design and applies across the full –40°C to +85°C operating range.
Can the LTC2306IDD#PBF operate with a 3.3V OVDD while using a 5V VDD?
Yes, the LTC2306IDD#PBF supports independent supplies: VDD = 4.75V–5.25V for analog core and OVDD = 2.7V–5.25V for digital I/O. Using 5V VDD with 3.3V OVDD allows direct interfacing with 3.3V microcontrollers or FPGAs without level-shifting components. SDO output swing will be referenced to OVDD, and SDI input thresholds remain compatible per VIH/VIL specs at 3.3V OVDD.
What is the minimum acquisition time required for full 12-bit accuracy with the LTC2306IDD#PBF?
The LTC2306IDD#PBF specifies a minimum acquisition time (tACQ) of 240ns - the period from the 7th SCK rising edge to the next CONVST rising edge - during which the internal sample-and-hold capacitor must settle to 12-bit accuracy. This assumes proper analog input drive capability (≤1kΩ source impedance) and adequate decoupling. Longer acquisition times may be needed with higher source impedances or aggressive input filtering.
Does the LTC2306IDD#PBF require an external reference, or does it have an internal one?
The LTC2306IDD#PBF requires an external reference applied to the VREF pin; it has no internal reference. The VREF input accepts voltages from 0.1V to VDD (max 5.25V), with typical use cases including 4.096V (for 1mV/LSB unipolar scaling) or 2.048V (for 0.5mV/LSB bipolar scaling). Reference current draw is 230µA maximum at 500ksps, necessitating a low-noise, capacitive-load-stable reference IC such as the LT6660.
LTC2306IDD#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:
- 2
- 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:
- -
LTC2306IDD#PBF FAQ
1.How can I place an order for LTC2306IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2306IDD#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 LTC2306IDD#PBF reliable?
The price and inventory of LTC2306IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2306IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2306IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2306IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2306IDD#PBF?
LTC2306IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2306IDD#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 LTC2306IDD#PBF?
For technical support, including LTC2306IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2306IDD#PBF requirements.
6.How does Aetrix verify that LTC2306IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2306IDD#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 LTC2306IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2306IDD#PBF?
All LTC2306IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2306IDD#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 LTC2306IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2306IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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