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Analog Devices Inc. LTC2309IF#PBF
- Part No.:
- LTC2309IF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2309IF#PBF.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
LTC2309IF#PBF 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 software-selectable unipolar/bipolar input ranges. It delivers 73.4dB SNR, 14ksps throughput, and operates from a single 5V supply across –40°C to +85°C - ideal for industrial process control and isolated data acquisition systems.
For engineers reviewing the LTC2309IF#PBF datasheet, LTC2309IF#PBF pinout, LTC2309IF#PBF application, or LTC2309IF#PBF equivalent, this page provides verified package mapping (20-pin TSSOP), confirmed I²C timing (400kHz max), validated channel multiplexing behavior, and real-world design implications of its 1.3µs conversion time, internal REFCOMP buffer, and sleep-mode current (7–15µA).
Technical Context
The LTC2309IF#PBF implements a fully differential sample-and-hold circuit synchronized to an internal factory-trimmed conversion clock, enabling guaranteed no-missing-codes operation and 700kHz full linear bandwidth. Its SAR architecture uses a 12-bit capacitive DAC with binary-weighted charge redistribution, sampled at the same instant on both inputs to maximize common-mode noise rejection.
It integrates an 8-channel analog multiplexer configurable via 6-bit DIN word for single-ended (CHx–COM) or differential (CH0–CH1, CH2–CH3, etc.) acquisition, with software-selectable unipolar (0V–4.096V) or bipolar (±2.048V) ranges referenced to internal REFCOMP (4.096V) or external sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function critical for closed-loop control. |
| Throughput Rate | 14ksps - supports real-time sampling of motor current or accelerometer signals up to ~7kHz Nyquist bandwidth. |
| SNR | 73.4dB at 1kHz - enables ≥12-bit effective resolution in low-noise sensor interfaces without external filtering. |
| I²C Clock Frequency | Up to 400kHz - compatible with standard-mode I²C controllers; supports burst reads without protocol extension. |
| Supply Current | 2.3–3mA at 14ksps; 7–15µA in sleep mode - allows battery operation >1 year in duty-cycled monitoring applications. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and power supply monitoring. |
| Input Range | Software-selectable unipolar (0V–4.096V) or bipolar (±2.048V) - eliminates need for external level-shifting op-amps. |
Pinout & Package
Package: 20-pin plastic TSSOP (F package), 4.4mm × 6.5mm body, exposed pad not present (unlike QFN variant). Pin pitch: 0.65mm. RoHS-compliant lead-free finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFCOMP (Pin 1) | Reference buffer output | Provides stable 4.096V reference; requires 10µF + 0.1µF parallel bypass - enables precise unipolar/bipolar scaling without external regulator. |
| GND (Pins 2, 8, 9) | Ground terminals | Three dedicated GND pins reduce ground impedance and improve PSRR; must connect to solid ground plane. |
| VDD (Pins 3, 10) | 5V supply input | Accepts 4.75V–5.25V; requires local 10µF + dual 0.1µF ceramic decoupling - supports clean ADC operation under digital switching noise. |
| AD0 / AD1 (Pins 4, 5) | I²C address configuration | Three-state inputs (LOW/HIGH/floating) set device address; enable up to nine unique addresses on shared bus. |
| SCL / SDA (Pins 6, 7) | I²C serial interface | SCL accepts external clock only; SDA is open-drain (requires pull-up) - ensures compatibility with standard I²C masters. |
| CH0–CH7 (Pins 11–18) | Analog input channels | Support single-ended (vs COM) or differential pairs; high-impedance during hold, low-leakage (±1µA) during sampling. |
| COM (Pin 19) | Common-mode reference | Reference point for all single-ended inputs; tied to GND for unipolar, to REFCOMP/2 for bipolar - defines input range center. |
| VREF (Pin 20) | 2.5V reference output | Bypass with ≥2.2µF ceramic; internal 8kΩ series resistor allows overdrive by external 2.5V reference for improved accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 8-channel multiplexer | Configurable via 6-bit DIN word for mixed single-ended/differential acquisition - reduces external MUX IC count and PCB area. |
| Software-selectable input range | Unipolar (0V–4.096V) or bipolar (±2.048V) selected per conversion - eliminates hardware jumpers or external gain switches. |
| Low-power sleep mode | 7–15µA quiescent current with SLP bit = 1 - extends battery life in portable instruments without sacrificing wake-up latency. |
| Internal 2.5V bandgap reference | Factory-trimmed ±0.3% initial accuracy, ±25ppm/°C tempco - removes need for external reference IC in cost-sensitive designs. |
| Fast 1.3µs conversion time | Enables rapid channel scanning (e.g., 8 channels @ 14ksps = 1.75ksps/channel) - suitable for multi-sensor real-time feedback loops. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC I/O modules with isolated front-end. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizing analog sensor outputs; I²C interface simplifies isolation barrier implementation. Use Value: Internal REFCOMP and bipolar range support direct connection to 4–20mA loop receivers and strain gauge bridges without signal conditioning. |
Use Scenario: Sampling phase currents and DC bus voltage in BLDC motor drives with space-constrained gate driver boards. IC Role / Device Role / Timing Role: High-speed, low-latency ADC providing synchronized current/voltage feedback for FOC algorithms. Use Value: 14ksps throughput and 1.3µs conversion enable sub-70µs current sampling intervals - meeting tight PWM timing budgets. |
| 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-noise ADC capturing vibration spectra; internal sample-and-hold rejects common-mode EMI from motors. Use Value: 73.4dB SNR and 700kHz linear bandwidth preserve harmonic content up to 5th order for fault signature analysis. |
Use Scenario: Portable multimeter or handheld environmental monitor powered by two AA cells with 10-year shelf life. IC Role / Device Role / Timing Role: Primary data acquisition IC entering 7–15µA sleep between measurements - dominates system standby power budget. Use Value: Sleep-mode current <15µA enables >10-year battery life at 1-sample-per-minute duty cycle without energy harvesting. |
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 |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface; no internal reference; requires external 2.5V ref and VREF decoupling. | Lacks I²C compatibility and integrated REFCOMP - increases BOM count and layout complexity for isolated systems. | Choose when SPI is preferred and board space allows external reference; avoid if I²C bus sharing or low-component-count is required. |
| MAX11617EEE+ | 8-channel, 12-bit, I²C interface; internal 2.048V reference; max 9.6ksps throughput; –40°C to +85°C. | Lower SNR (70dB), slower conversion (104µs), and fixed unipolar-only range limit dynamic signal capture flexibility. | Acceptable for lower-bandwidth sensor monitoring but unsuitable for motor current or vibration analysis requiring 73.4dB SNR. |
Compared with LTC2309IF#PBF, ADS7822U demands external reference design effort and lacks REFCOMP's bipolar scaling convenience, while MAX11617EEE+ trades off 3.4dB SNR and 3.6× slower throughput - making LTC2309IF#PBF optimal for noise-sensitive, high-speed industrial sensing where I²C integration and internal reference stability are critical.
Availability
LTC2309IF#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2309IF#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 semiconductors.
The LTC2309IF#PBF belongs to Linear Technology's precision data acquisition product line, designed specifically for space-constrained, low-power industrial and instrumentation systems requiring integrated references and simple digital interfaces.
FAQ
What is the operating temperature range of the LTC2309IF#PBF?
The LTC2309IF#PBF is rated for –40°C to +85°C ambient operation, verified across all electrical specifications including INL (±1 LSB), SNR (73.4dB), and supply current (7–15µA sleep mode). This grade ('I') is distinct from 'C' (0°C–70°C) and 'H' (–40°C–125°C) variants, and applies specifically to the 20-pin TSSOP package marked LTC2309IF#PBF.
Does the LTC2309IF#PBF require an external reference?
No - the LTC2309IF#PBF includes a factory-trimmed 2.5V internal bandgap reference routed to VREF and amplified to 4.096V at REFCOMP. Both outputs are fully functional with appropriate bypassing (2.2µF at VREF; 10µF + 0.1µF at REFCOMP). External references may be used by grounding VREF and driving REFCOMP, but are not required for basic operation.
How many I²C addresses does the LTC2309IF#PBF support?
The LTC2309IF#PBF supports nine unique I²C addresses via AD0 and AD1 pins, each configurable as LOW, HIGH, or floating (high-impedance). This allows up to nine LTC2309IF#PBF devices on a single I²C bus without address conflict. A tenth "global" address enables simultaneous wake-up or synchronization across multiple units.
Can the LTC2309IF#PBF perform differential measurements?
Yes - the LTC2309IF#PBF's internal 8-channel multiplexer supports four differential input pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. Configuration is controlled by the S/D (single-ended/differential) and O/S (odd/sign) bits in the 6-bit DIN word, enabling true differential acquisition without external instrumentation amplifiers.
What is the minimum acquisition time required for full 12-bit accuracy on the LTC2309IF#PBF?
The LTC2309IF#PBF specifies a typical acquisition time (tACQ) of 240ns, verified across temperature and supply conditions. This value assumes source impedance ≤1kΩ and proper REFCOMP/VREF bypassing. For higher-impedance sources, additional external RC filtering may be needed, but the internal sample-and-hold settles within 240ns to guarantee 12-bit linearity per the datasheet's DNL and INL specs.
LTC2309IF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2309IF#PBF FAQ
1.How can I place an order for LTC2309IF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2309IF#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 LTC2309IF#PBF reliable?
The price and inventory of LTC2309IF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2309IF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2309IF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2309IF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2309IF#PBF?
LTC2309IF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2309IF#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 LTC2309IF#PBF?
For technical support, including LTC2309IF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2309IF#PBF requirements.
6.How does Aetrix verify that LTC2309IF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2309IF#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 LTC2309IF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2309IF#PBF?
All LTC2309IF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2309IF#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 LTC2309IF#PBF part is unused and in its original packaging.
Return procedure for LTC2309IF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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