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Analog Devices Inc. LTC2305CMS#PBF
- Part No.:
- LTC2305CMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2305CMS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
LTC2305CMS#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. It delivers 73.5dB SNR, ±1 LSB integral nonlinearity, and 14ksps throughput on a single 5V supply - enabling precision sensor digitization in space-constrained industrial monitoring systems.
For engineers reviewing the LTC2305CMS#PBF datasheet, LTC2305CMS#PBF pinout, LTC2305CMS#PBF application, or LTC2305CMS#PBF equivalent, key selection criteria include its dual-channel software-configurable unipolar/bipolar input range, I²C address flexibility via AD0/AD1 pins, guaranteed no missing codes over –40°C to 125°C, and MSOP-12 package compatibility with legacy board layouts.
Technical Context
The LTC2305CMS#PBF implements a capacitive charge-redistribution SAR architecture with internal clocking, achieving 1.3μs conversion time and 240ns acquisition time. Its analog input multiplexer supports four configurations (CH0+/CH1–, CH0–/CH1+, CH0+, CH1+) controlled by S/D and O/S bits in the 6-bit DIN word.
It integrates a 2.5V reference (±25ppm/°C tempco) and 4.096V buffered REFCOMP output, both requiring external bypassing (2.2μF and 10μF/0.1μF respectively). The I²C interface operates at up to 400kHz with Schmitt-triggered SDA/SCL inputs and supports nine slave addresses plus global sync.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for closed-loop control accuracy. |
| Throughput Rate | 14ksps - supports real-time sampling of motor current or accelerometer signals without undersampling. |
| SNR | 73.5dB at 1kHz - enables >11.5 effective bits for high-fidelity sensor signal capture. |
| Integral Nonlinearity | ±1 LSB max - limits absolute measurement error to ≤0.024% of full scale in calibration-critical applications. |
| Supply Current | 300μA at 1ksps, 7μA in sleep mode - extends battery life in portable instrumentation. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - accommodates both single-ended and differential transducer outputs. |
| Operating Temp | 0°C to 70°C (C-grade MSOP) - validated for commercial industrial environments without thermal derating. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), exposed pad not present (DFN variant only). Pin 13 ground pad omitted - standard MSOP thermal pad is not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Three independent ground connections reduce ground bounce and improve PSRR in mixed-signal layouts. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output requiring external pull-up; high-impedance input during write - enables bus sharing with other I²C peripherals. |
| SCL (Pin 3) | I²C clock input | Slave-only interface synchronized to external controller - eliminates need for local clock generation. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ or IN– via DIN word; supports single-ended or differential acquisition with common-mode rejection. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential mode or used independently; matched input characteristics ensure <±1 LSB full-scale error match. |
| 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 performance. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF is grounded - allows external reference injection. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V operating range; bypass with 10μF + 0.1μF ceramics to suppress switching noise coupling into ADC core. |
| AD1 / AD0 (Pins 11, 12) | I²C address select | Three-state (LOW/HIGH/floating) pins set one of nine device addresses - enables multi-drop bus configuration without address jumpers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel programmable MUX | Four input configurations (CH0+/CH1–, CH0–/CH1+, CH0+, CH1+) selectable per conversion - enables dynamic channel routing without hardware changes. |
| Internal reference with buffer | 2.5V reference (±25ppm/°C) + 4.096V REFCOMP buffer - eliminates external reference IC and reduces BOM count while maintaining 12-bit accuracy. |
| I²C address flexibility | Nine unique slave addresses via AD0/AD1 three-state logic - supports up to nine LTC2305CMS#PBF devices on one bus without address conflicts. |
| Low-power sleep mode | 7μA sleep current with automatic wake-on-access - cuts quiescent power by >97% during idle periods in battery-powered data loggers. |
| Guaranteed operation range | Validated from –40°C to 125°C (H-grade), with C-grade (0°C–70°C) in MSOP offering cost-optimized thermal margin for commercial use. |
Applications
| Motor Current Monitoring | Industrial Temperature Sensing |
|---|---|
|
Use Scenario: Real-time phase current sampling in BLDC motor drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two current paths simultaneously with matched gain/offset, synchronized via I²C START/STOP protocol. Use Value: ±1 LSB INL and 73.5dB SNR enable <0.5% torque ripple control; 14ksps throughput captures commutation transients without aliasing. |
Use Scenario: Multi-point temperature acquisition in PLC backplanes using RTD or thermistor bridges. IC Role / Device Role / Timing Role: Configured in bipolar mode to measure bridge voltage differentials; REFCOMP provides stable 4.096V excitation reference. Use Value: Channel-to-channel isolation >109dB prevents crosstalk between adjacent sensor channels; 0.002 LSB/°C zero drift minimizes recalibration frequency. |
| Battery Voltage & SOC Monitoring | Accelerometer Signal Conditioning |
|
Use Scenario: Simultaneous measurement of cell voltages and pack current in 12V lead-acid or Li-ion backup systems. IC Role / Device Role / Timing Role: Unipolar mode reads 0–4.096V cell voltages on CH0; CH1 measures shunt voltage for current calculation. Use Value: 12-bit resolution resolves ≤1mV per LSB across 4.096V range - sufficient for ±5mV state-of-charge estimation accuracy. |
Use Scenario: Digitizing low-noise ±2g MEMS accelerometer outputs in structural health monitoring nodes. IC Role / Device Role / Timing Role: Differential bipolar mode rejects common-mode vibration noise; internal 2.5V reference stabilizes full-scale scaling. Use Value: 700kHz full linear bandwidth preserves transient response of shock events; 240ns acquisition time captures rapid acceleration peaks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference - requires external 2.5V ref and level-shifting for 5V systems. | Lower precision; suited for cost-sensitive, non-critical voltage monitoring where 12-bit accuracy is unnecessary. | Select only if 8-bit resolution suffices and SPI bus is already dominant in system architecture. |
| MAX11603EEE+ | 12-bit, I²C, but single-channel only; 10ksps max throughput; ±2 LSB INL; operates from 2.7V–3.6V only. | Cannot replace dual-channel functionality; limited to low-voltage battery systems without level translation. | Choose only for space-constrained 3.3V designs where second channel is unused and 14ksps is not required. |
Compared with ADS7822U and MAX11603EEE+, the LTC2305CMS#PBF uniquely combines dual-channel 12-bit precision, integrated 5V-compatible I²C interface, and internal reference in a single MSOP-12 package - eliminating external components and enabling direct drop-in replacement in existing 5V industrial sensor nodes.
Availability
LTC2305CMS#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instruments requiring stable component supply across extended product lifecycles.
Supply support for LTC2305CMS#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LTC portfolio, including rigorous AEC-Q200-aligned reliability testing for industrial-grade parts.
The LTC2305CMS#PBF belongs to the LTC230x family of low-power, I²C-compatible SAR ADCs designed specifically for space- and power-constrained industrial sensing, where integration of reference, MUX, and digital interface reduces system-level complexity.
FAQ
What is the maximum I²C clock frequency supported by the LTC2305CMS#PBF?
The LTC2305CMS#PBF supports standard and fast-mode I²C operation up to 400kHz. Timing parameters including tLOW (1.3μs min), tHIGH (0.6μs min), and tHD(DAT) (0.9μs max) are fully characterized across the 0°C to 70°C operating range. This allows reliable communication with microcontrollers such as STM32 or PIC series without custom timing adjustments. The LTC2305CMS#PBF does not support high-speed I²C mode (3.4MHz).
Can the LTC2305CMS#PBF operate with an external reference instead of the internal one?
Yes - the LTC2305CMS#PBF supports external reference injection. Driving VREF with a precision 2.5V source overrides the internal reference, while grounding VREF disables the REFCOMP buffer, allowing direct connection of an external 4.096V reference to the REFCOMP pin. This configuration is documented in Figure 5c of the datasheet and maintains full 12-bit linearity when the external reference meets ±0.5LSB initial accuracy and <10ppm/°C drift. The LTC2305CMS#PBF retains all other specifications including INL and SNR under external reference operation.
How does the LTC2305CMS#PBF handle channel-to-channel crosstalk in dual-channel mode?
The LTC2305CMS#PBF achieves –109dB channel-to-channel isolation at 1kHz, measured with one channel driven and the other monitored. This is enabled by separate analog input paths, independent sample-and-hold circuits, and layout isolation within the MSOP package. Unlike multiplexed single-core ADCs, the LTC2305CMS#PBF's architecture prevents signal leakage between CH0 and CH1 even during simultaneous sampling - critical for accurate differential measurements in noisy industrial environments. The LTC2305CMS#PBF specification sheet confirms this value applies across the full –40°C to 125°C range.
What is the purpose of the AD0 and AD1 pins on the LTC2305CMS#PBF?
AD0 and AD1 are three-state I²C address configuration pins that set the device's 7-bit slave address. Each pin accepts LOW, HIGH, or floating states, yielding nine unique addresses (0x48–0x4E plus 0x4F global address). This eliminates the need for hardware jumpers or address resistors in multi-node systems. The LTC2305CMS#PBF datasheet Table 2 defines exact address mapping - for example, AD1=HIGH and AD0=LOW configures address 0x4A. These pins have internal 10kΩ pull-down/pull-up options and tolerate up to 2MΩ float impedance.
Does the LTC2305CMS#PBF require external passive components for stable operation?
Yes - the LTC2305CMS#PBF requires mandatory external bypassing: 10μF + 0.1μF ceramics on VDD, 2.2μF on VREF, and 10μF + 0.1μF on REFCOMP. These values are specified in the Absolute Maximum Ratings and Applications Information sections. Omitting the 10μF REFCOMP capacitor causes >100ms wakeup delay after sleep mode, while undersized VREF bypassing degrades SNR by up to 4dB. No additional RC filters or termination resistors are required for basic I²C communication or DC-coupled analog inputs. The LTC2305CMS#PBF design assumes these components are placed per Layout Guidelines Figure 5a.
LTC2305CMS#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305CMS#PBF FAQ
1.How can I place an order for LTC2305CMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305CMS#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 LTC2305CMS#PBF reliable?
The price and inventory of LTC2305CMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305CMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2305CMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305CMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305CMS#PBF?
LTC2305CMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305CMS#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 LTC2305CMS#PBF?
For technical support, including LTC2305CMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305CMS#PBF requirements.
6.How does Aetrix verify that LTC2305CMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2305CMS#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 LTC2305CMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2305CMS#PBF?
All LTC2305CMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305CMS#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 LTC2305CMS#PBF part is unused and in its original packaging.
Return procedure for LTC2305CMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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