My Inquiry
My Account
Analog Devices Inc. LTC2309CUF#PBF
- Part No.:
- LTC2309CUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2309CUF#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2309CUF#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 integrated 8-channel multiplexer. It delivers 73.4dB SNR, 14ksps throughput, and operates from a single 5V supply at 1.5mW (1ksps). It is used in isolated data acquisition systems requiring precise unipolar/bipolar voltage monitoring.
For engineers reviewing the LTC2309CUF#PBF datasheet, LTC2309CUF#PBF pinout, LTC2309CUF#PBF application, or LTC2309CUF#PBF equivalent, key selection criteria include guaranteed no missing codes, ±0.45LSB integral nonlinearity, 1.3µs conversion time, –40°C to 70°C operating range (QFN), and I²C address configurability via AD0/AD1 pins.
Technical Context
The LTC2309CUF#PBF implements a fully differential sample-and-hold circuit with internal conversion clock, enabling fast 1.3µs conversions without external timing components. Its SAR architecture uses a 12-bit capacitive DAC and differential comparator for monotonic, missing-code-free operation across its full temperature range.
It supports software-selectable unipolar (0V–4.096V) or bipolar (±2.048V) input ranges per channel, with COM pin serving as common-mode reference. The I²C interface operates at up to 400kHz with nine configurable slave addresses plus global sync, and includes open-drain SDA with pull-up requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for precision control loops. |
| Throughput Rate | 14ksps - supports real-time sampling of motor current or accelerometer waveforms without undersampling. |
| SNR | 73.4dB at 1kHz - enables >11.5 effective bits for high-fidelity sensor digitization. |
| Integral Nonlinearity | ±0.45LSB (typ) - limits end-point error to <0.011% FS, critical for calibration-critical instrumentation. |
| Supply Current | 2.3mA at 14ksps, 350µA in nap mode - balances performance and battery life in portable instruments. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - simplifies signal conditioning for diverse sensor outputs. |
| Reference | Internal 2.5V bandgap + 4.096V buffered REFCOMP - eliminates external reference IC, reduces BOM count and board area. |
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 bypassing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH2 (22–24) | Analog input channels 0–2 | Support single-ended (vs COM) or differential (e.g., CH0–CH1) configurations; 55pF input capacitance requires controlled source impedance. |
| CH3–CH7 (1–5) | Analog input channels 3–7 | Identical electrical behavior to CH0–CH2; all eight channels share same INL/DNL specs and switching characteristics. |
| COM (6) | Common-mode reference node | Must be low-noise; tied to GND for unipolar mode, to REFCOMP/2 for bipolar mode - defines input common-mode voltage. |
| VREF (7) | 2.5V internal reference output | Bypass with ≥2.2µF ceramic capacitor; 8kΩ series resistor allows overdriving with external 2.5V reference for improved drift. |
| REFCOMP (8) | 4.096V buffered reference output | Bypass with 10µF + 0.1µF ceramics; disabled if VREF grounded - enables use of external 4.096V reference (e.g., LT1790A-4.096). |
| GND (9–11, 18–20) | Power and analog ground | All pins must connect to unified low-impedance ground plane; exposed pad (25) is mandatory GND connection for thermal and noise performance. |
| VDD (12, 13, 21) | 5V supply input | Operates from 4.75V–5.25V; total supply current scales linearly with throughput - decoupling critical for SNR stability. |
| AD0 / AD1 (14–15) | I²C address configuration | Three-state inputs (LOW/HIGH/floating) set LSBs of 7-bit slave address - enables up to nine unique devices on same bus. |
| SCL (16) | I²C serial clock input | Accepts external clock up to 400kHz; LTC2309CUF#PBF acts only as slave - no clock generation capability. |
| SDA (17) | I²C bidirectional data line | Open-drain output during read (requires pull-up to VDD); high-impedance input during write - supports standard I²C protocol timing. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 8-channel analog multiplexer | Reduces external component count and PCB area; supports dynamic reconfiguration between conversions without hardware changes. |
| Configurable unipolar/bipolar input range | Enables single-part support for both positive-only sensors (e.g., temperature RTDs) and AC-coupled signals (e.g., vibration accelerometers). |
| Low-power nap/sleep modes | 350µA nap mode and 15µA sleep mode extend battery life in portable instruments while retaining fast wake-up (<200ms REFCOMP settle). |
| Guaranteed operation from –40°C to 70°C | Validated performance across industrial ambient range - eliminates derating concerns in enclosure-mounted data loggers. |
| I²C-compatible 9-address capability | Allows daisy-chaining up to nine LTC2309CUF#PBF units on one bus - ideal for multi-sensor nodes in distributed monitoring systems. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
Use Scenario: Monitoring multiple analog process variables (pressure, flow, temperature) in PLC I/O modules with isolated front-end stages. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC digitizing conditioned 4–20mA loop outputs and thermocouple amplifiers. Use Value: Internal 2.5V reference and REFCOMP buffer eliminate need for external precision references, reducing system cost and layout complexity. |
Use Scenario: Real-time current sensing and position feedback acquisition in servo drives with space-constrained gate driver boards. IC Role / Device Role / Timing Role: High-speed SAR ADC capturing phase currents and encoder signals with 14ksps throughput and 1.3µs conversion latency. Use Value: Guaranteed no missing codes and ±0.45LSB INL ensure accurate torque calculation and prevent control instability in closed-loop FOC algorithms. |
| Accelerometer Measurements | Battery-Operated Instruments |
Use Scenario: Digitizing triaxial MEMS accelerometer outputs in portable structural health monitoring devices deployed on bridges or machinery. IC Role / Device Role / Timing Role: Low-noise 12-bit ADC acquiring ±2.048V differential accelerometer signals with 73.4dB SNR for sub-millig resolution. Use Value: Bipolar input range and differential channel support directly interface to low-noise instrumentation amplifiers without level-shifting circuitry. |
Use Scenario: Power supply monitoring and sensor data logging in handheld multimeters or portable gas detectors with 10+ hour battery life. IC Role / Device Role / Timing Role: Ultra-low-power ADC operating in nap mode between measurements, drawing only 350µA when active at 1ksps. Use Value: Sleep mode current of 7–15µA extends shelf life and operational runtime - critical for devices with infrequent measurement cycles. |
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; 2.7–5.25V supply | Requires external reference and level-shifting for 5V systems; higher throughput but less integration | Choose when SPI-native microcontrollers dominate the design and higher speed justifies added BOM complexity. |
| MAX11613EEE+ | 8-channel, 12-bit, I²C interface; internal 2.048V reference; 9.6ksps; –40°C to +85°C | Lower SNR (70dB), smaller REFCOMP voltage (2.048V), and reduced temperature range vs LTC2309CUF#PBF | Choose for cost-sensitive consumer-grade applications where 73.4dB SNR and extended industrial temp range are not required. |
Compared with ADS7822U and MAX11613EEE+, the LTC2309CUF#PBF provides superior noise performance (73.4dB SNR), factory-trimmed 4.096V REFCOMP, and broader industrial temperature validation - making it optimal for precision, space-constrained, battery-aware designs requiring minimal external components.
Availability
LTC2309CUF#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 consistent parametric performance.
Supply support for LTC2309CUF#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 for precision measurement and control.
The LTC2309CUF#PBF belongs to Linear's precision data acquisition product line, designed specifically for low-power, multichannel, high-accuracy sensing in space- and power-constrained industrial and portable systems.
FAQ
What is the operating temperature range specified for the LTC2309CUF#PBF?
The LTC2309CUF#PBF is rated for operation from –40°C to +70°C. This grade is confirmed by the "C" suffix in the part number and applies to the 24-lead QFN package. Performance specifications including INL, SNR, and reference accuracy are guaranteed across this full range.
Does the LTC2309CUF#PBF require an external reference, or does it include an internal one?
The LTC2309CUF#PBF includes a factory-trimmed internal 2.5V bandgap reference, accessible at the VREF pin, and a buffered 4.096V output at REFCOMP. No external reference is required for basic operation, though VREF can be overdriven for improved accuracy or drift performance.
How many I²C addresses can be configured on the LTC2309CUF#PBF?
The LTC2309CUF#PBF supports nine unique I²C slave addresses via the AD0 and AD1 pins, which accept LOW, HIGH, or floating states. One additional global address enables synchronized conversions across multiple devices on the same bus.
What is the maximum sampling rate and corresponding power consumption of the LTC2309CUF#PBF?
The LTC2309CUF#PBF achieves a maximum throughput rate of 14ksps with a typical supply current of 2.3mA. At this rate, power dissipation is approximately 11.5mW - verified under VDD = 5V, TA = 25°C conditions per the datasheet.
Can the LTC2309CUF#PBF perform both unipolar and bipolar conversions, and how is the mode selected?
Yes, the LTC2309CUF#PBF supports both unipolar (0V–4.096V) and bipolar (±2.048V) input ranges. The mode is selected dynamically via the UNI bit in the 6-bit DIN configuration word sent over I²C - no hardware change is needed between modes.
LTC2309CUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- 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:
- 24-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2309CUF#PBF FAQ
1.How can I place an order for LTC2309CUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2309CUF#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 LTC2309CUF#PBF reliable?
The price and inventory of LTC2309CUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2309CUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2309CUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2309CUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2309CUF#PBF?
LTC2309CUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2309CUF#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 LTC2309CUF#PBF?
For technical support, including LTC2309CUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2309CUF#PBF requirements.
6.How does Aetrix verify that LTC2309CUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2309CUF#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 LTC2309CUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2309CUF#PBF?
All LTC2309CUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2309CUF#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 LTC2309CUF#PBF part is unused and in its original packaging.
Return procedure for LTC2309CUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2309CUF#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
