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Analog Devices Inc. LTC2309CF#TRPBF
- Part No.:
- LTC2309CF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2309CF#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,769
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Product details
Overview
LTC2309CF#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 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. It is used in battery-operated instrumentation and isolated data acquisition systems.
For engineers reviewing the LTC2309CF#TRPBF datasheet, LTC2309CF#TRPBF pinout, LTC2309CF#TRPBF application, or LTC2309CF#TRPBF equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for industrial process control, motor control, power supply monitoring, and accelerometer measurement designs.
Technical Context
The LTC2309CF#TRPBF integrates an internal 2.5V bandgap reference buffered to 4.096V at REFCOMP, a fully differential sample-and-hold circuit, and an internal conversion clock enabling 1.3µs conversion time. Its 8-channel analog multiplexer supports both single-ended and differential configurations via software-controlled DIN word.
It uses a 12-bit capacitive DAC with successive approximation logic, accepts I²C commands at up to 400kHz, and features three-state address pins (AD0/AD1) supporting nine unique slave addresses plus global sync. All specifications-including ±0.45LSB integral nonlinearity and ±1LSB differential nonlinearity-are guaranteed over 0°C to 70°C for the TSSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes-ensures monotonic transfer function for precision control loops. |
| Throughput Rate | 14ksps-supports real-time sampling of motor current waveforms or power supply ripple at 14,000 samples per second. |
| SNR | 73.4dB at 1kHz-enables accurate digitization of low-level sensor signals like accelerometers without external amplification. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar)-matches common transducer output spans without external level-shifting. |
| Supply | Single 5V (4.75–5.25V); 2.3mA typical at 14ksps-compatible with standard logic rails and simplifies power design in space-constrained PCBs. |
| Operating Temp | 0°C to 70°C-qualified for commercial-grade embedded instrumentation and industrial HMI front-ends. |
| Package | 20-pin TSSOP (4.4mm × 6.5mm)-enables high-density routing and reflow-compatible assembly in compact sensor modules. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (F package), 4.4mm × 6.5mm body, 0.65mm pitch. Exposed pad not present; all GND pins (2, 8, 9) must connect to solid ground plane.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REFCOMP | 4.096V reference buffer output; requires 10µF + 0.1µF bypass to GND-provides stable scaling voltage for full-scale ADC conversions. |
| 2, 8, 9 | GND | Ground return for analog/digital domains; must tie to low-impedance ground plane-prevents noise coupling between channels and ensures INL stability. |
| 3, 10 | VDD | 5V supply input; bypassed with 10µF + two 0.1µF ceramics-maintains clean rail during 2.3mA dynamic current draw at 14ksps. |
| 4, 5 | AD0, AD1 | I²C address configuration pins (three-state: LOW/HIGH/floating)-select one of nine device addresses to support multi-ADC bus topologies. |
| 6 | SCL | I²C serial clock input (slave-only); accepts 400kHz max-synchronizes data transfer without requiring master-side timing margining. |
| 7 | SDA | Bidirectional I²C data line (open-drain output, high-Z input)-requires external pull-up; transmits 12-bit result + 4 trailing zeros on read. |
| 11–18 | CH0–CH7 | Analog input channels; configurable as single-ended vs. differential pairs (e.g., CH0/CH1)-enables flexible sensor interfacing without external MUX hardware. |
| 19 | COM | Common-mode reference for single-ended inputs; tied to GND (unipolar) or VREFCOMP/2 (bipolar)-defines input offset point and enables ratiometric measurements. |
| 20 | VREF | 2.5V internal reference output; bypassed with ≥2.2µF ceramic-can be overdriven by external 2.5V source to improve accuracy or drift performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference + 4.096V REFCOMP buffer | Eliminates need for external reference IC and associated layout area; 25ppm/°C tempco ensures <±0.5LSB zero error drift over 0°C–70°C. |
| Software-configurable unipolar/bipolar mode | Single register write selects input range-avoids hardware jumpers or resistor networks when adapting to varying sensor outputs. |
| Low-power nap/sleep modes | 350µA nap mode and 15µA sleep mode reduce average power in duty-cycled systems-extends battery life in portable instruments beyond 100 hours. |
| 8-channel analog multiplexer with differential capability | Supports four independent differential pairs (CH0/CH1, CH2/CH3, etc.)-enables simultaneous current/voltage sensing with common-mode noise rejection. |
| I²C interface with nine address options | Enables daisy-chained or parallel ADC configurations on same bus-simplifies BOM and firmware for multi-sensor nodes in industrial IoT gateways. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC analog input modules. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizing 4–20mA loop receivers and thermocouple signal conditioners. Use Value: 12-bit resolution and ±0.45LSB INL ensure <0.1% full-scale accuracy across 8 channels-meets IEC 61000-4-5 surge immunity requirements for field instrumentation. |
Use Scenario: Sampling phase currents and DC bus voltage in BLDC motor drives. IC Role / Device Role / Timing Role: Simultaneous sampling of current shunt voltages and bus voltage for FOC algorithms. Use Value: 14ksps throughput and 1.3µs conversion time enable >1kHz current loop bandwidth-supports high-efficiency commutation without external sample-hold circuits. |
| Power Supply Monitoring | Accelerometer Measurements |
Use Scenario: Real-time tracking of output voltage, current, and temperature in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Digitizing isolated sense signals from Hall-effect current sensors and resistive dividers. Use Value: Bipolar input mode accepts ±2.048V differential signals from isolated amplifiers-eliminates level-shifting op-amps and reduces component count by 30%. |
Use Scenario: Capturing vibration signatures from MEMS accelerometers in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Low-noise ADC sampling triaxial accelerometer outputs with 73.4dB SNR. Use Value: 55pF analog input capacitance and 700kHz full linear bandwidth preserve signal integrity up to 100Hz mechanical resonance-enables reliable FFT-based fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface; no internal reference; 50ksps max; requires external 2.5V ref. | Requires external reference and SPI host-less suitable for I²C-only microcontrollers but offers higher speed for burst sampling. | Select ADS7822U only if system already uses SPI peripherals and needs >14ksps throughput; verify external reference stability meets ±0.5LSB zero error spec. |
| MCP3208-I/P | 8-channel, 12-bit, SPI interface; internal 4.096V ref; 100ksps; no bipolar mode; 28-pin PDIP package. | Larger footprint and no software-selectable bipolar range-limits use in space-constrained or dual-range sensor interfaces. | Choose MCP3208-I/P for cost-sensitive, non-bipolar applications where DIP packaging is acceptable and SPI is preferred over I²C. |
Compared with LTC2309CF#TRPBF, ADS7822U trades I²C simplicity for higher speed and external reference flexibility, while MCP3208-I/P sacrifices bipolar operation and TSSOP compactness for lower unit cost in legacy through-hole designs.
Availability
LTC2309CF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and power supply monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for LTC2309CF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2309CF#TRPBF belongs to the Linear Technology Precision SAR ADC product line, designed specifically for low-power, multichannel data acquisition in space- and energy-constrained industrial and instrumentation systems.
FAQ
What is the operating temperature range for the LTC2309CF#TRPBF?
The LTC2309CF#TRPBF is specified for 0°C to 70°C operation, matching the 'C' grade designation in its part number. This range is validated for the 20-pin TSSOP package and covers commercial and light-industrial environments such as factory floor HMIs and benchtop test equipment. The LTC2309CF#TRPBF does not support extended temperature grades-use LTC2309IF#TRPBF (–40°C to 85°C) or LTC2309HF#TRPBF (–40°C to 125°C) for harsher conditions.
Does the LTC2309CF#TRPBF require an external reference voltage?
No, the LTC2309CF#TRPBF includes a factory-trimmed 2.5V internal bandgap reference, buffered to 4.096V at the REFCOMP pin. This eliminates the need for external reference components in most applications. However, the VREF pin can be overdriven with an external 2.5V source (e.g., LT1790A-2.5) to improve initial accuracy or temperature drift-this is optional and only required for metrology-grade designs demanding <±0.25LSB total error.
How many I²C addresses does the LTC2309CF#TRPBF support?
The LTC2309CF#TRPBF supports nine unique I²C slave 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 LTC2309CF#TRPBF units on a single I²C bus without address conflict, enabling scalable multichannel acquisition in distributed sensor networks without address jumpers or EEPROM programming.
Can the LTC2309CF#TRPBF perform differential measurements?
Yes, the LTC2309CF#TRPBF supports true differential input pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. This is configured via the S/D and O/S bits in the 6-bit DIN command word. Each pair provides full 12-bit resolution with common-mode rejection >70dB, making the LTC2309CF#TRPBF suitable for measuring small differential signals-such as current shunt voltages-in noisy industrial environments without external instrumentation amplifiers.
What is the minimum acquisition time required before conversion completes?
The LTC2309CF#TRPBF specifies a typical acquisition time (tACQ) of 240ns, which is the duration the internal sample-and-hold circuit requires to settle after channel selection. This value is guaranteed over the full 0°C to 70°C range and enables reliable 14ksps throughput. For high-impedance sources (>1kΩ), additional external RC filtering may extend effective acquisition time-designers should verify full 12-bit settling within tACQ using the 55pF input capacitance model provided in the datasheet.
LTC2309CF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2309CF#TRPBF FAQ
1.How can I place an order for LTC2309CF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2309CF#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 LTC2309CF#TRPBF reliable?
The price and inventory of LTC2309CF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2309CF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2309CF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2309CF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2309CF#TRPBF?
LTC2309CF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2309CF#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 LTC2309CF#TRPBF?
For technical support, including LTC2309CF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2309CF#TRPBF requirements.
6.How does Aetrix verify that LTC2309CF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2309CF#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 LTC2309CF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2309CF#TRPBF?
All LTC2309CF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2309CF#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 LTC2309CF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2309CF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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