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Analog Devices Inc. LTC2305CMS#TRPBF
- Part No.:
- LTC2305CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2305CMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,462
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Product details
Overview
LTC2305CMS#TRPBF 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 high-accuracy sensor digitization in space-constrained industrial monitoring systems.
For engineers reviewing the LTC2305CMS#TRPBF datasheet, LTC2305CMS#TRPBF pinout, LTC2305CMS#TRPBF application, or LTC2305CMS#TRPBF equivalent, key selection considerations include its software-selectable unipolar/bipolar input ranges, 1.3μs conversion time, guaranteed no missing codes, and operation across 0°C to 70°C in the 12-lead MSOP package.
Technical Context
The LTC2305CMS#TRPBF implements a capacitive charge-redistribution SAR architecture with an integrated 2.5V reference and 4.096V buffered REFCOMP output. Its analog input multiplexer supports configurable single-ended or differential acquisition across CH0/CH1, with simultaneous sampling and 70dB common-mode rejection.
Controlled via a 2-wire I²C interface supporting 9 device addresses plus global sync, it accepts a 6-bit DIN word to configure S/D (single-ended/differential), O/S (odd/sign), UNI (unipolar/bipolar), and SLP (sleep mode) bits - enabling dynamic reconfiguration between conversions without interrupting data flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for precision control feedback loops. |
| Throughput Rate | 14ksps - supports real-time motor current sampling at 1.4kHz electrical frequency with oversampling headroom. |
| SNR | 73.5dB at 1kHz - enables ≥11.9 effective bits for accelerometer or strain gauge signal conditioning. |
| Integral Nonlinearity | ±1 LSB max - limits absolute error to ±0.024% of full-scale range in closed-loop power supply monitoring. |
| Supply Current | 300μA at 1ksps, 7μA in sleep mode - extends battery life in portable instrumentation beyond 1 year at 10s wake-up intervals. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - eliminates external level-shifting for dual-supply sensor interfaces. |
| Reference | Internal 2.5V VREF (±25ppm/°C) + 4.096V REFCOMP buffer - reduces BOM count by removing external reference IC and trimming components. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), operating temperature range 0°C to 70°C. Exposed pad not present (DFN variant only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Three independent ground connections minimize ground bounce during 12-bit sampling; all must connect to solid ground plane. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output requiring pull-up to VDD; transmits 16-bit read result (12 data + 4 trailing zeros) on falling SCL edges. |
| SCL (Pin 3) | I²C clock input | Slave-only interface; data latched on rising edge, shifted out on falling edge - compatible with standard I²C controllers. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ (differential) or single-ended input; sampled simultaneously with CH1 for phase-coherent acquisition. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential measurement or independent single-ended sensing; matched full-scale error ≤ ±2 LSB. |
| VREF (Pin 7) | 2.5V reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source to improve long-term stability. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF grounded - enables external reference injection. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V operation; bypass with 10μF + 0.1μF ceramics to suppress switching noise coupling into SAR core. |
| AD1 / AD0 (Pins 11, 12) | I²C address select | Three-state inputs (LOW/HIGH/floating) set 3-bit address; support up to 9 devices on same bus without address conflict. |
Key Features
| Feature | Design Value |
|---|---|
| 2-channel analog MUX with dynamic reconfiguration | Enables per-conversion selection of CH0/CH1 differential polarity or single-ended mode via 6-bit DIN word - critical for multi-sensor synchronization. |
| Internal 2.5V reference with 4.096V buffered output | Eliminates need for external precision reference IC and voltage divider, reducing PCB area by >15mm² and component count by 3–5 parts. |
| 1.3μs conversion time with no latency | Allows deterministic timing in real-time control loops; conversion completes before next I²C clock cycle at 400kHz SCL. |
| Software-selectable unipolar/bipolar input ranges | Supports direct connection of both ground-referenced (e.g., thermistor) and floating (e.g., bridge sensor) signals without external op-amp circuitry. |
| 7μA sleep mode current | Reduces average system power by >99% during idle periods - essential for coin-cell-powered IoT edge nodes. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring 4–20mA loop outputs and RTD temperature sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Dual-channel digitizer acquiring synchronized current and temperature samples at 1ksps for PID loop execution. Use Value: ±1 LSB INL and 73.5dB SNR ensure <0.1% total measurement uncertainty across 0–100°C range without calibration. |
Use Scenario: Sampling phase currents in 3-phase inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Simultaneous CH0/CH1 acquisition captures current waveforms with <10ns inter-channel skew for field-oriented control. Use Value: 14ksps throughput enables 1.4kHz fundamental sampling - meeting IEC 61800-3 harmonic analysis requirements. |
| Battery-Operated Instrumentation | Power Supply Monitoring |
|
Use Scenario: Portable multimeters and handheld analyzers requiring 12-bit resolution with >10-hour battery life. IC Role / Device Role / Timing Role: Low-power ADC managing wake-on-event sampling of voltage/current rails with automatic nap-to-sleep transition. Use Value: 7μA sleep current extends CR2032 battery life to 14 months at 10-second measurement intervals. |
Use Scenario: Real-time monitoring of DC-DC converter outputs and rail voltages in telecom base station power shelves. IC Role / Device Role / Timing Role: High-accuracy digitizer interfacing directly to 0–4.096V scaled outputs of precision voltage dividers. Use Value: Internal 4.096V REFCOMP provides exact scaling ratio (1:1024) - eliminating gain error from external references. |
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, 200ksps throughput | Targeted at cost-sensitive, high-speed but lower-accuracy applications like basic panel meters | Select when resolution ≤8-bit suffices and SPI host interface is available; avoid for precision sensor interfaces requiring 12-bit linearity. |
| MCP3221-AI/P | 12-bit resolution, I²C interface, external reference required, 100ksps throughput, SOIC-8 package | Designed for general-purpose embedded sensing where board space is less constrained than in portable instruments | Choose when external 2.5V reference already exists in system; note lack of REFCOMP buffer increases layout sensitivity to noise. |
Compared with ADS7822U and MCP3221-AI/P, the LTC2305CMS#TRPBF uniquely integrates a buffered 4.096V reference, guarantees ±1 LSB INL, and supports true simultaneous dual-channel acquisition - making it optimal for high-fidelity, space-constrained industrial data loggers.
Availability
LTC2305CMS#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and battery-operated instrumentation requiring stable component supply and guaranteed long-term availability.
Supply support for LTC2305CMS#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2305CMS#TRPBF belongs to the LTC230x family of low-power, I²C-compatible SAR ADCs designed specifically for precision measurement in space- and power-constrained industrial and portable systems.
FAQ
What is the maximum sampling rate supported by the LTC2305CMS#TRPBF?
The LTC2305CMS#TRPBF achieves a maximum throughput rate of 14ksps under standard conditions (VDD = 5V, fSCL = 400kHz). This is enabled by its internal conversion clock and 1.3μs conversion time. At lower throughput rates like 1ksps, supply current drops to 300μA, optimizing power for battery operation. The LTC2305CMS#TRPBF does not support oversampling modes beyond this rated speed.
Does the LTC2305CMS#TRPBF require external reference components?
No - the LTC2305CMS#TRPBF integrates a 2.5V reference (VREF) and a buffered 4.096V output (REFCOMP), eliminating the need for external reference ICs or trimming networks. External bypassing is required: ≥2.2μF at VREF and 10μF + 0.1μF in parallel at REFCOMP. The LTC2305CMS#TRPBF allows overdriving VREF with an external 2.5V source for enhanced stability if needed.
How are the two analog input channels configured on the LTC2305CMS#TRPBF?
The LTC2305CMS#TRPBF uses a 6-bit DIN word sent via I²C to configure CH0 and CH1 as either differential pairs (e.g., CH0+ / CH1−) or independent single-ended inputs referenced to GND. The S/D and O/S bits determine polarity and pairing. Unlike the LTC2301, the LTC2305CMS#TRPBF supports true dual-channel operation - both channels can be sampled simultaneously with matched full-scale error ≤ ±2 LSB.
What is the operating temperature range for the LTC2305CMS#TRPBF?
The LTC2305CMS#TRPBF is specified for operation from 0°C to 70°C, as indicated by the "C" grade suffix in its ordering code. This commercial-grade temperature range is validated across all electrical specifications including INL (±1 LSB), SNR (73.5dB), and supply current (300μA at 1ksps). For extended temperature operation, the LTC2305IMS#TRPBF (–40°C to 85°C) or LTC2305HMS#TRPBF (–40°C to 125°C) variants are available.
Can the LTC2305CMS#TRPBF operate from a 3.3V supply?
No - the LTC2305CMS#TRPBF requires a 4.75V to 5.25V analog supply (VDD) and is not rated for 3.3V operation. Its internal reference generation, SAR capacitor array, and I²C interface logic are optimized for 5V. Attempting 3.3V operation will result in undefined behavior, failed conversions, or permanent damage. For 3.3V systems, consider the LTC2305-1 variant or external level-shifting of the I²C bus while maintaining 5V VDD.
LTC2305CMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2305CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305CMS#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 LTC2305CMS#TRPBF reliable?
The price and inventory of LTC2305CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2305CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305CMS#TRPBF?
LTC2305CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305CMS#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 LTC2305CMS#TRPBF?
For technical support, including LTC2305CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305CMS#TRPBF requirements.
6.How does Aetrix verify that LTC2305CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2305CMS#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 LTC2305CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2305CMS#TRPBF?
All LTC2305CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305CMS#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 LTC2305CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2305CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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