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Analog Devices Inc. LTC2309CF#PBF
- Part No.:
- LTC2309CF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2309CF#PBF.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,477
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Product details
Overview
LTC2309CF#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, 1.3µs conversion time, and operates from a single 5V supply across 0°C to 70°C - ideal for industrial process control and battery-operated instrumentation.
For engineers reviewing the LTC2309CF#PBF datasheet, LTC2309CF#PBF pinout, LTC2309CF#PBF application, or LTC2309CF#PBF equivalent, key selection criteria include guaranteed no missing codes, ±0.45LSB integral nonlinearity, 20-pin TSSOP package with exposed thermal pad, I²C address configurability via AD0/AD1 pins, and sleep-mode current of 7–15µA - all critical for space-constrained, low-power embedded data acquisition systems.
Technical Context
The LTC2309CF#PBF integrates a fully differential sample-and-hold circuit and internal conversion clock to achieve fast 1.3µs conversions without external timing components. Its 8-channel analog multiplexer supports both single-ended (vs. COM) and differential (e.g., CH0–CH1) configurations, with programmable input polarity via the 6-bit DIN word.
It uses a 12-bit capacitive charge redistribution DAC and SAR logic for precision digitization, while the I²C interface operates at up to 400kHz with open-drain SDA and Schmitt-triggered SCL. The internal 2.5V reference feeds a gain-of-1.638 amplifier to produce 4.096V at REFCOMP - enabling precise unipolar 0–4.096V or bipolar ±2.048V full-scale ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and deterministic code transitions in closed-loop control. |
| Throughput Rate | 14ksps - supports real-time sampling of motor current, accelerometer, or power supply ripple signals without undersampling. |
| SNR | 73.4dB at 1kHz - enables >11.5 effective bits for high-fidelity sensor signal digitization in noisy industrial environments. |
| Integral Nonlinearity | ±0.45LSB (typ), ±1LSB (max) - maintains accuracy across full temperature range (0°C to 70°C) without calibration. |
| Supply Current | 2.3–3mA at 14ksps; 7–15µA in sleep mode - allows multi-day operation on coin-cell batteries in portable instruments. |
| Input Range | Software-selectable 0–4.096V (unipolar) or ±2.048V (bipolar) - simplifies interface to diverse sensors without external level-shifting. |
| I²C Address Options | Nine fixed addresses + one global sync address - enables daisy-chaining up to nine LTC2309CF#PBF devices on same bus. |
Pinout & Package
Package: 20-pin plastic TSSOP (F package), 6.5mm × 4.4mm footprint, exposed thermal pad (GND), rated for 0°C to 70°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFCOMP (Pin 1) | Reference buffer output | Provides stable 4.096V reference for unipolar/bipolar scaling; requires 10µF + 0.1µF bypass to GND. |
| GND (Pins 2, 8, 9) | Ground return | Three dedicated ground pins reduce ground bounce and improve noise immunity in mixed-signal layouts. |
| VDD (Pins 3, 10) | 5V supply input | Accepts 4.75–5.25V; requires local 10µF + dual 0.1µF ceramic decoupling per pin. |
| AD0 / AD1 (Pins 4, 5) | I²C address configuration | Three-state inputs (LOW/HIGH/floating) set device address; internal 10kΩ pull-up/down resistors simplify wiring. |
| SCL / SDA (Pins 6, 7) | I²C serial interface | SCL accepts 400kHz clock; SDA is open-drain requiring external VDD pull-up - compatible with standard microcontroller I²C peripherals. |
| CH0–CH7 (Pins 11–18) | Analog input channels | Eight configurable inputs supporting single-ended (vs. COM) or differential pairs (e.g., CH0–CH1); 55pF input capacitance. |
| COM (Pin 19) | Common-mode reference | Reference point for single-ended inputs; must be low-noise - tied to GND (unipolar) or VREF/2 (bipolar). |
| VREF (Pin 20) | 2.5V internal reference output | Bypass with ≥2.2µF ceramic capacitor; can be overdriven by external 2.5V source to improve drift performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V bandgap reference | Factory-trimmed ±25ppm/°C tempco; eliminates need for external reference IC and reduces BOM count. |
| Configurable 8-channel analog MUX | Software-selectable single-ended/differential and unipolar/bipolar modes via 6-bit DIN command - enables flexible sensor interfacing without hardware changes. |
| Low-power sleep mode | 7–15µA quiescent current with full state retention - extends battery life in intermittent-sampling applications like remote environmental monitors. |
| Fast 1.3µs conversion time | Enabled by internal conversion clock - removes dependency on external timing sources and simplifies system-level synchronization. |
| High channel-to-channel isolation | –109dB at 1kHz - prevents crosstalk between adjacent channels during simultaneous multi-sensor acquisition. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC I/O modules. IC Role / Device Role / Timing Role: 12-bit SAR ADC with internal reference and I²C interface digitizes analog sensor outputs for real-time PID loop execution. Use Value: ±0.45LSB INL and 73.4dB SNR ensure <0.02% measurement error across 0–70°C, meeting SIL-2 functional safety requirements. |
Use Scenario: Sampling phase currents and DC bus voltage in BLDC motor drives. IC Role / Device Role / Timing Role: Simultaneous sampling of multiple current shunts and voltage dividers via 8-channel MUX with <1.3µs conversion latency. Use Value: 14ksps throughput and –109dB channel isolation prevent torque ripple caused by inter-channel coupling in field-oriented control. |
| Accelerometer Measurements | Battery-Operated Instruments |
|
Use Scenario: Digitizing triaxial MEMS accelerometer outputs in structural health monitoring nodes. IC Role / Device Role / Timing Role: Low-noise 12-bit ADC with differential input support captures sub-mg vibration signatures without external amplification. Use Value: 73.4dB SNR and 55pF input capacitance enable direct connection to low-output-impedance accelerometers, reducing component count and board area. |
Use Scenario: Power supply monitoring and sensor logging in handheld multimeters and gas detectors. IC Role / Device Role / Timing Role: Ultra-low-power ADC with 7–15µA sleep current and I²C wake-on-address capability enables years of operation on CR2032 cells. Use Value: Single 5V supply and integrated reference eliminate need for LDOs and reference buffers - cutting bill-of-materials cost by >30% vs. discrete solutions. |
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 SAR ADC with SPI interface; no internal reference; requires external 2.5V reference and separate power supply sequencing. | Requires additional reference IC and level-shifting for 3.3V microcontrollers; lacks I²C address flexibility and sleep-mode optimization. | Choose ADS7822U only if existing design uses SPI infrastructure and external reference is already present - avoids I²C bus contention in dense systems. |
| MAX11612EEE+ | 8-channel, 12-bit SAR ADC with I²C interface; internal 2.048V reference; max 9.6ksps throughput; 0°C to 70°C rating. | Lower SNR (70dB), no bipolar input support, and slower conversion (104µs) limit use in high-dynamic-range or fast-control applications. | Prefer MAX11612EEE+ for cost-sensitive, lower-performance applications where 4.096V full-scale and 14ksps are not required - saves ~15% BOM cost. |
Compared with ADS7822U and MAX11612EEE+, the LTC2309CF#PBF uniquely combines I²C address configurability, 4.096V reference for exact 12-bit code alignment, 14ksps speed, and 7–15µA sleep current - making it optimal for next-generation portable and industrial data loggers requiring minimal external components and long battery life.
Availability
LTC2309CF#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2309CF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2309CF#PBF belongs to ADI's precision data acquisition product line, designed specifically for low-power, multi-channel sensor interfacing in space- and energy-constrained embedded systems - emphasizing integration, noise performance, and ease of I²C-based firmware integration.
FAQ
What is the operating temperature range of the LTC2309CF#PBF?
The LTC2309CF#PBF is specified for operation from 0°C to 70°C, matching the 'C' grade designation in its part number. This range covers commercial and light industrial environments where ambient temperatures remain within standard office or factory floor conditions. The device maintains full performance - including ±0.45LSB integral nonlinearity and 73.4dB SNR - across this entire range without derating or calibration.
Does the LTC2309CF#PBF require an external reference voltage?
No, the LTC2309CF#PBF does not require an external reference voltage because it integrates a factory-trimmed 2.5V bandgap reference and a gain-of-1.638 amplifier that produces a precise 4.096V output at the REFCOMP pin. This internal reference supports both unipolar (0–4.096V) and bipolar (±2.048V) input ranges directly. However, VREF and REFCOMP can be overdriven by external references if higher accuracy or lower drift is needed.
How many I²C addresses does the LTC2309CF#PBF support?
The LTC2309CF#PBF supports nine unique I²C slave addresses plus one global address for synchronized conversions, configured using the AD0 and AD1 pins in three states (LOW, HIGH, or floating). This allows up to nine LTC2309CF#PBF devices to share a single I²C bus without address conflict - essential for distributed sensor networks or modular data acquisition systems.
What is the minimum acquisition time required before conversion completes?
The LTC2309CF#PBF requires a minimum acquisition time (tACQ) of 240ns to settle the internal sample-and-hold circuit to 12-bit accuracy. This value is guaranteed over the full 0°C to 70°C temperature range and applies regardless of input configuration (single-ended or differential). The total conversion time remains fixed at 1.3µs, meaning the device is ready for the next read/write cycle after that interval.
Can the LTC2309CF#PBF perform differential measurements between arbitrary channel pairs?
Yes, the LTC2309CF#PBF supports differential measurements between four predefined pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. This is implemented via its internal analog multiplexer, which is programmed using the S/D (single-ended/differential), O/S (odd/sign), S1, and S0 bits of the 6-bit DIN word. Differential mode provides common-mode noise rejection and improved SNR for low-level sensor signals.
LTC2309CF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2309CF#PBF FAQ
1.How can I place an order for LTC2309CF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2309CF#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 LTC2309CF#PBF reliable?
The price and inventory of LTC2309CF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2309CF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2309CF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2309CF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2309CF#PBF?
LTC2309CF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2309CF#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 LTC2309CF#PBF?
For technical support, including LTC2309CF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2309CF#PBF requirements.
6.How does Aetrix verify that LTC2309CF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2309CF#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 LTC2309CF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2309CF#PBF?
All LTC2309CF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2309CF#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 LTC2309CF#PBF part is unused and in its original packaging.
Return procedure for LTC2309CF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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