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Analog Devices Inc. LTC2305IMS#PBF
- Part No.:
- LTC2305IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2305IMS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,744
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Product details
Overview
LTC2305IMS#PBF from Analog Devices (formerly Linear Technology) is a 2-channel, 12-bit successive approximation ADC with I²C-compatible serial interface, internal 2.5V reference, and fully differential sample-and-hold circuit. It operates from a single 5V supply, achieves 14ksps throughput and 1.3μs conversion time, and supports software-selectable unipolar (0V–4.096V) or bipolar (±2.048V) input ranges - ideal for precision sensor interfacing in space-constrained industrial systems.
For engineers reviewing the LTC2305IMS#PBF datasheet, LTC2305IMS#PBF pinout, LTC2305IMS#PBF application, or LTC2305IMS#PBF equivalent, key selection criteria include its guaranteed no-missing-codes performance, –40°C to +85°C operating range in MSOP package, low 73.5dB SNR, 12-pin I²C address configurability (AD0/AD1), and sleep-mode current of just 35μA - all critical for battery-powered and thermally demanding embedded data acquisition.
Technical Context
The LTC2305IMS#PBF implements a capacitive charge-redistribution SAR architecture with internal clocking, eliminating external timing components. Its analog input multiplexer enables per-conversion reconfiguration between CH0/CH1 single-ended or differential modes via 6-bit DIN word (S/D and O/S bits), supporting dynamic channel switching without hardware changes.
It integrates a buffered 4.096V REFCOMP output and 2.5V VREF output, both internally trimmed and temperature-compensated (±25ppm/°C). The I²C interface supports standard/fast mode (400kHz), nine device addresses plus global sync, and open-drain SDA with pull-up requirement - requiring no level-shifting when interfaced with 5V-tolerant microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and full-scale linearity for control-loop feedback. |
| Throughput Rate | 14ksps - supports real-time monitoring of fast transients in motor control or power supply telemetry. |
| SNR | 73.5dB at 1kHz - enables accurate digitization of low-amplitude sensor signals (e.g., strain gauges, accelerometers) without external amplification. |
| Integral Nonlinearity | ±1 LSB max - limits end-point error to ≤0.024% FS, critical for calibration-critical instrumentation. |
| Supply Current | 300μA at 1ksps; 35μA in sleep mode - extends battery life in portable data loggers beyond 1 year on coin-cell power. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - simplifies signal conditioning for both ground-referenced and floating sensors. |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation and automotive under-hood auxiliary sensing applications. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), exposed pad not present (DFN variant has exposed GND pad; MSOP does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Three dedicated ground pins minimize ground bounce and improve PSRR; must connect to solid ground plane. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read (requires external pull-up); high-impedance input during write - compatible with 3.3V/5V controllers. |
| SCL (Pin 3) | I²C clock input | Slave-only interface; accepts external clock up to 400kHz - no internal clock generation required for bus timing. |
| CH0 (Pin 5), CH1 (Pin 6) | Analog input channels | Configurable as single-ended (vs GND) or differential pair; support simultaneous sampling with common-mode rejection >70dB. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source for improved stability or drift specs. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; provides precise scaling for unipolar/bipolar full-scale; disabled if VREF grounded. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V range; bypass with 10μF + 0.1μF ceramics - decouples digital noise from analog section. |
| AD0, AD1 (Pins 11, 12) | I²C address select | Three-state inputs (LOW/HIGH/floating) set one of nine device addresses - enables multi-drop bus without address jumpers. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference with ±25ppm/°C tempco | Eliminates external reference IC and associated layout area; maintains <±0.5 LSB full-scale drift over –40°C to +85°C. |
| Software-configurable unipolar/bipolar input range | Single register write switches between 0V–4.096V and ±2.048V - avoids hardware redesign when sensor polarity or grounding changes. |
| Channel multiplexer with per-conversion reconfiguration | Dynamic MUX control via DIN word allows alternating CH0/CH1 reads or differential pairing within same I²C transaction sequence. |
| 1.3μs conversion time with internal clock | Removes need for external timing circuitry; enables deterministic latency for time-critical closed-loop control. |
| 35μA sleep-mode current | Reduces average system power in duty-cycled sensing nodes - e.g., 10ms active/990ms sleep yields ~36μA avg current. |
| Guaranteed operation from –40°C to +85°C | Validated across full industrial temperature range in MSOP package - no derating or characterization overhead for field deployment. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
Use Scenario: Monitoring multiple analog process variables (temperature, pressure, flow) in PLC I/O modules with limited PCB area. IC Role / Device Role / Timing Role: Dual-channel ADC acquires synchronized samples from two 4–20mA loop receivers or RTD signal conditioners via programmable gain stages. Use Value: Eliminates need for two separate ADCs or external multiplexers, reducing BOM count and layout complexity while maintaining 12-bit accuracy across channels. |
Use Scenario: Sampling phase currents and DC bus voltage in BLDC motor inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous bipolar-mode sampling of current-sense amplifier outputs and unipolar sampling of bus voltage divider. Use Value: 14ksps throughput meets minimum 10kHz FOC update rate; ±1 LSB INL ensures torque ripple <0.5% at full load. |
| Accelerometer Measurements | Power Supply Monitoring |
Use Scenario: Digitizing outputs from triaxial MEMS accelerometers in structural health monitoring or vibration analysis equipment. IC Role / Device Role / Timing Role: Single-ended acquisition of three accelerometer outputs (X/Y/Z) using CH0/CH1 and external mux, or differential acquisition of dual-axis sensors. Use Value: 73.5dB SNR resolves sub-mg acceleration changes; low 300μA active current enables multi-year battery operation in remote deployments. |
Use Scenario: Real-time monitoring of rail voltages (3.3V, 5V, 12V) and current sense in telecom power shelves or server PSUs. IC Role / Device Role / Timing Role: Unipolar measurement of scaled-down rail voltages and bipolar measurement of shunt-based current sense signals. Use Value: Internal 4.096V REFCOMP provides exact 1mV/LSB scaling for 4.096V full-scale - enabling direct µV-level resolution without calibration offsets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel, I²C-compatible, 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference, 200kSPS max - higher speed but lower precision and different protocol. | Requires external reference and level-shifting for 5V systems; suited for cost-sensitive, non-precision threshold detection only. | Select only if 8-bit resolution suffices and SPI bus is already dominant in target MCU design. |
| MCP3221-E/P | 12-bit, single-channel, I²C, internal reference, 22.3ksps - lacks second channel and bipolar mode; smaller 8-pin PDIP/SOIC package. | Cannot replace dual-channel functionality without adding external mux or second device; limited to single-sensor applications. | Choose when board space is extreme constraint and only one analog input is needed per node. |
Compared with ADS7822U and MCP3221-E/P, the LTC2305IMS#PBF uniquely delivers 2-channel 12-bit precision with bipolar capability, integrated reference, and industrial temperature rating - making it the only drop-in solution for dual-sensor, calibration-grade, battery-operated industrial data acquisition where channel count, accuracy, and thermal robustness are co-constrained.
Availability
LTC2305IMS#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and power supply monitoring requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.
Supply support for LTC2305IMS#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 LTC2305IMS#PBF belongs to the LTC230x family of low-power, I²C-compatible SAR ADCs designed specifically for space- and power-constrained industrial, instrumentation, and portable measurement systems requiring precision without external support components.
FAQ
What is the maximum I²C clock frequency supported by the LTC2305IMS#PBF?
The LTC2305IMS#PBF supports standard and fast-mode I²C operation up to 400kHz. Its tLOW and tHIGH timing parameters are specified at 1.3μs and 0.6μs respectively, ensuring reliable communication with common microcontrollers like STM32, PIC, and MSP430 without custom timing adjustments. The LTC2305IMS#PBF does not support high-speed I²C (3.4MHz).
Does the LTC2305IMS#PBF require external reference components?
No - the LTC2305IMS#PBF integrates a precision 2.5V reference (VREF) and a buffered 4.096V reference (REFCOMP), both trimmed and temperature-compensated. External bypass capacitors (2.2μF for VREF; 10μF + 0.1μF for REFCOMP) are mandatory, but no external reference IC or resistor dividers are needed. The LTC2305IMS#PBF can also accept overdrive from external references if higher stability is required.
How does the LTC2305IMS#PBF handle channel selection between CH0 and CH1?
The LTC2305IMS#PBF uses a 6-bit DIN word sent via I²C write to configure the analog multiplexer. Bits S/D (single-ended/differential) and O/S (odd/sign) determine whether CH0 and CH1 are used as single-ended inputs vs. a differential pair, and which polarity is applied. This configuration is updated before each conversion, enabling dynamic per-sample channel routing without hardware changes. The LTC2305IMS#PBF does not support automatic scanning.
What is the purpose of the AD0 and AD1 pins on the LTC2305IMS#PBF?
AD0 and AD1 are three-state I²C address configuration pins on the LTC2305IMS#PBF. Each can be pulled LOW, HIGH, or left floating to select one of nine unique 7-bit I²C slave addresses (plus one global address). This allows up to nine LTC2305IMS#PBF devices on the same I²C bus without address conflicts - essential for multi-node sensor arrays or modular I/O systems.
Can the LTC2305IMS#PBF operate in bipolar mode with a single-ended input?
No - bipolar mode on the LTC2305IMS#PBF requires differential input configuration (S/D = 0), where CH0 and CH1 form a true differential pair referenced to REFCOMP/2. Single-ended operation (S/D = 1) is unipolar only (0V to 4.096V), as the negative input is internally tied to GND. Attempting bipolar interpretation of single-ended data will result in incorrect full-scale scaling and offset errors. The LTC2305IMS#PBF's bipolar capability is inherently differential.
LTC2305IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 14k
- Number of Inputs:
- 2
- 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:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305IMS#PBF FAQ
1.How can I place an order for LTC2305IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305IMS#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 LTC2305IMS#PBF reliable?
The price and inventory of LTC2305IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2305IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305IMS#PBF?
LTC2305IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305IMS#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 LTC2305IMS#PBF?
For technical support, including LTC2305IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305IMS#PBF requirements.
6.How does Aetrix verify that LTC2305IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2305IMS#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 LTC2305IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2305IMS#PBF?
All LTC2305IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305IMS#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 LTC2305IMS#PBF part is unused and in its original packaging.
Return procedure for LTC2305IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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