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Analog Devices Inc. LTC2309IUF#TRPBF
- Part No.:
- LTC2309IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2309IUF#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
LTC2309IUF#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter with I²C interface, internal 2.5V reference, and integrated 8-channel multiplexer. It delivers 73.4dB SNR, 14ksps throughput, and operates from a single 5V supply across –40°C to +85°C - ideal for isolated data acquisition in industrial motor control systems.
For engineers reviewing the LTC2309IUF#TRPBF datasheet, LTC2309IUF#TRPBF pinout, LTC2309IUF#TRPBF application, or LTC2309IUF#TRPBF equivalent, key selection criteria include guaranteed no missing codes, software-selectable unipolar/bipolar input ranges, fast 1.3µs conversion time, low 35µW sleep-mode power, and QFN-24 package compatibility with space-constrained embedded designs.
Technical Context
The LTC2309IUF#TRPBF implements a fully differential sample-and-hold circuit synchronized to an internal factory-trimmed conversion clock, enabling 1.3µs conversion time without external timing components. Its SAR architecture uses a 12-bit capacitive DAC and differential comparator to resolve input voltage against the internal 2.5V reference or overdriven external references.
It supports configurable analog input routing via an 8-channel MUX controlled by a 6-bit DIN word, allowing per-conversion selection of single-ended (vs COM) or differential (e.g., CH0–CH1) inputs in either unipolar (0V–4.096V) or bipolar (±2.048V) mode - all managed through a 2-wire I²C slave interface with nine selectable addresses plus global sync.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for precision control feedback loops. |
| Throughput Rate | 14ksps - supports real-time sampling of motor current, vibration, or power supply ripple at sub-72µs intervals. |
| SNR | 73.4dB at 1kHz - enables accurate digitization of low-amplitude sensor signals (e.g., accelerometers) without external amplification. |
| Power (1ksps) | 1.5mW - allows battery operation for >1 year in portable instrumentation with 100mA·h capacity. |
| Input Range | Software-selectable 0V–4.096V unipolar or ±2.048V bipolar - eliminates need for external level-shifting circuitry in mixed-signal systems. |
| Reference | Internal 2.5V bandgap reference (±25ppm/°C tempco), buffered to 4.096V at REFCOMP - reduces BOM count and PCB area vs discrete reference solutions. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry nodes. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed pad (Pin 25 = GND). All GND pins (9–11, 18–20) must connect to solid ground plane; VDD pins (12, 13, 21) require local 10µF + three 0.1µF ceramic decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 22–24, 1–5) | Analog input channels | Support single-ended (vs COM) or differential (e.g., CH2–CH3) configurations; each draws ≤1µA leakage - compatible with high-Z sensor outputs. |
| COM (Pin 6) | Common-mode reference | Must be low-noise; tied to GND for unipolar mode or to REFCOMP/2 for bipolar - defines input common-mode point for all channels. |
| VREF (Pin 7) | 2.5V internal reference output | Bypassed with ≥2.2µF ceramic; can be overdriven by external 2.5V source to improve accuracy or drift performance. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypassed with 10µF + 0.1µF ceramics; disabled when VREF grounded - enables use of external 4.096V reference (e.g., LT1790A-4.096). |
| AD0/AD1 (Pins 14–15) | I²C address select bits | Three-state (LOW/HIGH/floating) inputs set device address; RINL/RINH = 10kΩ - allows up to 9 unique addresses on same bus without external resistors. |
| SCL/SDA (Pins 16–17) | I²C serial interface | SDA is open-drain (requires pull-up); SCL max frequency 400kHz - compatible with standard/fast-mode I²C controllers in microcontrollers and SoCs. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 8-channel analog MUX | Reduces external signal routing complexity and PCB layer count - enables compact multi-sensor monitoring without external multiplexers. |
| Software-selectable unipolar/bipolar mode | Eliminates need for external op-amp level shifters or dual-supply circuitry when measuring both positive and negative transducer outputs. |
| Low 35µW sleep-mode power | Extends battery life in intermittent-sampling applications (e.g., environmental sensors) while maintaining full configuration retention. |
| Guaranteed operation from –40°C to +85°C | Validated across full temperature range - avoids derating or thermal compensation logic in industrial control firmware. |
| Fast 1.3µs conversion time | Minimizes aperture jitter and enables tight synchronization with PWM-driven systems like servo motor controllers. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
|
Use Scenario: Monitoring multiple analog process variables (temperature, pressure, flow) in PLC I/O modules with isolation barriers. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizing isolated sensor outputs via optocoupled or transformer-isolated I²C buses. Use Value: Internal reference and MUX reduce component count by 4+ parts per channel; 14ksps rate supports closed-loop response times <100µs. |
Use Scenario: Sampling phase currents and DC bus voltage in 3-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous (time-interleaved) acquisition of current sense and voltage feedback signals with <1.3µs latency. Use Value: Bipolar input mode directly accepts ±2.048V shunt amplifier outputs; 73.4dB SNR preserves resolution for <0.1% torque ripple control. |
| Accelerometer Measurements | Battery-Operated Instruments |
|
Use Scenario: Digitizing triaxial MEMS accelerometer outputs in predictive maintenance edge nodes deployed on rotating machinery. IC Role / Device Role / Timing Role: Low-power 12-bit ADC capturing vibration spectra with minimal noise floor contribution. Use Value: 35µW sleep mode extends node lifetime; 55pF input capacitance simplifies anti-alias filtering with small RC networks. |
Use Scenario: Portable multimeters and handheld test equipment requiring high-resolution analog front ends with long battery life. IC Role / Device Role / Timing Role: Primary ADC handling voltage, current, and resistance measurements using internal reference and programmable gain paths. Use Value: Single 5V supply and 1.5mW active power enable operation from two AA cells; I²C interface minimizes MCU GPIO usage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 16-channel, SPI interface, 1MSPS max, no internal reference - requires external 2.5V ref and level-shifting for 5V systems. | Better channel count and speed but higher power (1.8mW @ 1MSPS); lacks I²C and integrated reference - increases BOM and layout complexity. | Choose ADS7953IRHBT only if >8 channels or >14ksps throughput is required and SPI is preferred over I²C. |
| MAX11617ETE+ | 12-bit, 8-channel, I²C interface, 100ksps, internal 2.048V ref, –40°C to +105°C - lower SNR (70dB) and no bipolar mode support. | Higher speed and extended temperature range but limited to unipolar inputs only - unsuitable for AC-coupled or differential sensor interfaces. | Choose MAX11617ETE+ only for unipolar-only applications needing faster sampling or wider temp range, accepting reduced noise performance. |
Compared with ADS7953IRHBT and MAX11617ETE+, the LTC2309IUF#TRPBF uniquely combines I²C simplicity, integrated bipolar/unipolar flexibility, and 73.4dB SNR in a thermally robust QFN package - making it optimal for cost-sensitive, space-constrained industrial sensing where reference integration and low noise are critical.
Availability
LTC2309IUF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LTC2309IUF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2309IUF#TRPBF belongs to ADI's precision data acquisition product line, designed specifically for low-power, multi-channel, isolated sensing applications where integration, noise performance, and ease of I²C interfacing are prioritized.
FAQ
What is the operating temperature range for the LTC2309IUF#TRPBF?
The LTC2309IUF#TRPBF is rated for operation from –40°C to +85°C, validated across this full range for parameters including INL, SNR, and throughput. This makes the LTC2309IUF#TRPBF suitable for industrial environments such as factory floors and outdoor telemetry enclosures where ambient temperatures exceed commercial-grade limits.
Does the LTC2309IUF#TRPBF require an external reference?
No, the LTC2309IUF#TRPBF includes a factory-trimmed 2.5V internal bandgap reference, buffered to 4.096V at the REFCOMP pin. The LTC2309IUF#TRPBF can operate fully autonomously using this reference; however, VREF and REFCOMP may be overdriven by external sources (e.g., LT1790A-4.096) to improve accuracy or temperature stability when required.
How many I²C addresses does the LTC2309IUF#TRPBF support?
The LTC2309IUF#TRPBF supports nine unique I²C addresses via AD0 and AD1 pins configured as LOW, HIGH, or floating - plus one global address for synchronized conversions across multiple devices. This allows up to nine LTC2309IUF#TRPBF units on a single I²C bus without address conflicts or external address jumpers.
Can the LTC2309IUF#TRPBF perform differential measurements?
Yes, the LTC2309IUF#TRPBF supports true differential input pairs (e.g., CH0–CH1, CH2–CH3) via its internal 8-channel MUX, controlled by the 6-bit DIN word. Each differential pair is sampled simultaneously with full 12-bit resolution and 73.4dB SNR - enabling accurate measurement of bridge sensors or isolated current shunts without external instrumentation amplifiers.
What is the minimum acquisition time required for full 12-bit accuracy with the LTC2309IUF#TRPBF?
The LTC2309IUF#TRPBF specifies a typical acquisition time (tACQ) of 240ns, which is the minimum time needed for the internal sample-and-hold circuit to settle to 12-bit accuracy after channel selection. This value assumes low-impedance driving sources (<1kΩ); higher source impedances require longer settling and may necessitate external RC filtering per Figure 3a in the datasheet.
LTC2309IUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 14k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2309IUF#TRPBF FAQ
1.How can I place an order for LTC2309IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2309IUF#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 LTC2309IUF#TRPBF reliable?
The price and inventory of LTC2309IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2309IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2309IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2309IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2309IUF#TRPBF?
LTC2309IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2309IUF#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 LTC2309IUF#TRPBF?
For technical support, including LTC2309IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2309IUF#TRPBF requirements.
6.How does Aetrix verify that LTC2309IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2309IUF#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 LTC2309IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2309IUF#TRPBF?
All LTC2309IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2309IUF#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 LTC2309IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2309IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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