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Analog Devices Inc. LTC2305IMS#TRPBF
- Part No.:
- LTC2305IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2305IMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,135
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Product details
Overview
LTC2305IMS#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 - ideal for precision sensor monitoring in space-constrained industrial systems.
For engineers reviewing the LTC2305IMS#TRPBF datasheet, LTC2305IMS#TRPBF pinout, LTC2305IMS#TRPBF application, or LTC2305IMS#TRPBF equivalent, key selection criteria include its dual-channel software-configurable unipolar/bipolar input range, guaranteed no missing codes over –40°C to 85°C, low 300μA active current at 1ksps, and MSOP-12 package compatibility with isolated data acquisition layouts.
Technical Context
The LTC2305IMS#TRPBF implements a capacitive charge-redistribution SAR architecture with internal conversion clock, enabling 1.3μs conversion time and zero-latency output. Its analog input multiplexer supports per-conversion reconfiguration of CH0/CH1 as single-ended or differential pairs via 6-bit DIN word control (S/D and O/S bits).
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 9 device addresses plus global sync, operates up to 400kHz, and uses open-drain SDA with Schmitt-triggered SCL for noise immunity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and full-scale linearity for closed-loop control feedback. |
| Throughput Rate | 14ksps maximum - supports real-time motor current sampling at 1.4kHz per channel with oversampling capability. |
| SNR | 73.5dB typical at 1kHz - enables accurate 11.2-bit effective resolution for accelerometer or strain gauge signals. |
| INL | ±1 LSB max over temperature - maintains <0.025% full-scale error across –40°C to 85°C for calibrated sensor interfaces. |
| Supply Current | 300μA at 1ksps, 225μA nap mode - extends battery life in portable instrumentation without sacrificing conversion readiness. |
| I²C Clock Frequency | 400kHz max - compatible with standard-mode microcontrollers and avoids timing margin issues in multi-device buses. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - eliminates external level-shifting for bridge sensors or bipolar op-amp outputs. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), exposed pad not present (DFN variant only). Operating temperature range: –40°C to 85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Three dedicated ground pins minimize ground bounce; all must connect to solid ground plane for 73.5dB SNR performance. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read; high-impedance input during write - requires external pull-up to VDD for bus arbitration. |
| SCL (Pin 3) | I²C clock input | Slave-only interface; rising edge latches DIN bits, falling edge clocks out 16-bit result (12 data + 4 zeros). |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ (differential) or single-ended relative to GND - supports direct connection to resistive sensors. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential measurement or independent single-ended use - enables simultaneous dual-sensor capture. |
| VREF (Pin 7) | 2.5V internal 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 - allows external precision reference substitution. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V operation; bypass with 10μF + 0.1μF ceramics to suppress switching noise coupling into analog path. |
| AD1 / AD0 (Pins 11, 12) | I²C address configuration | Three-state inputs (LOW/HIGH/floating) set one of nine device addresses - enables daisy-chaining up to 9 LTC2305s on same bus. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel software-reconfigurable MUX | Per-conversion selection of CH0/CH1 as single-ended or differential pairs via 6-bit DIN word - eliminates hardware redesign for sensor topology changes. |
| Internal 2.5V reference + 4.096V REFCOMP | ±25ppm/°C tempco and 2.46V–2.54V output tolerance - reduces BOM count by removing external references in cost-sensitive designs. |
| 14ksps throughput with 1.3μs conversion | Zero-latency output and no pipeline delay - enables deterministic timing for time-critical control loops without FIFO buffering. |
| Nap/sleep power modes | 225μA nap current and 7μA sleep current - cuts average power >99% during idle periods while retaining I²C addressability. |
| Guaranteed operation from –40°C to 85°C | Specified performance across full industrial temperature range - eliminates derating calculations for outdoor or factory-floor deployments. |
Applications
| Motor Control Feedback | Isolated Sensor Interface |
|---|---|
|
Use Scenario: Sampling phase currents and DC bus voltage in BLDC inverters with optical isolation. IC Role / Device Role / Timing Role: Dual-channel ADC acquires synchronized current/voltage samples via software-configured differential inputs, feeding real-time PWM update logic. Use Value: 14ksps throughput enables 1.4kHz control loop updates; ±1 LSB INL ensures <0.025% torque ripple accuracy across temperature. |
Use Scenario: Reading isolated thermocouple or RTD signals using digital isolators between MCU and sensor front-end. IC Role / Device Role / Timing Role: Acts as isolated-side digitizer, converting analog sensor outputs to I²C packets transmitted across barrier. Use Value: Internal 2.5V reference eliminates need for isolated reference supply; 73.5dB SNR preserves 11-bit thermal resolution despite galvanic separation. |
| Battery-Operated Instrumentation | Industrial Process Monitoring |
|
Use Scenario: Portable multimeter or handheld data logger measuring voltage, current, and temperature. IC Role / Device Role / Timing Role: Central ADC digitizing multiple sensor types (shunt, thermistor, potentiometer) via shared I²C bus and channel multiplexing. Use Value: 300μA active current and 7μA sleep mode extend AA battery life to >1 year; software-selectable input ranges simplify firmware calibration. |
Use Scenario: Distributed I/O module monitoring pressure, flow, and level transmitters in PLC racks. IC Role / Device Role / Timing Role: Local ADC node acquiring 2-channel analog inputs per module, reporting via backplane I²C or SPI-to-I²C bridge. Use Value: MSOP-12 footprint fits high-density PCB layouts; –40°C to 85°C rating ensures reliability in unconditioned control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel, 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-driven, non-critical voltage monitoring where 12-bit resolution is unnecessary. | Select only if 8-bit resolution suffices and SPI bus is preferred over I²C; verify external reference stability meets system accuracy goals. |
| MCP3221A0T-E/OT | Single-channel, 12-bit, I²C, internal 2.048V ref - lacks dual-input MUX and bipolar mode support. | Requires two devices for dual-sensor applications; unipolar-only input limits use with AC-coupled or bipolar signal sources. | Choose when only one analog input is needed and board space permits two ICs; confirm 2.048V ref matches existing signal chain scaling. |
Compared with ADS7822U and MCP3221A0T-E/OT, the LTC2305IMS#TRPBF uniquely combines dual-channel flexibility, bipolar/unipolar software selection, integrated 4.096V REFCOMP, and guaranteed 12-bit linearity - making it the only option supporting high-accuracy, space-constrained, multi-sensor industrial designs without external support components.
Availability
LTC2305IMS#TRPBF is available at Aetrix Electronics and suitable for motor control feedback, isolated sensor interfaces, battery-operated instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC2305IMS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2305IMS#TRPBF belongs to ADI's precision data acquisition portfolio, designed specifically for low-power, space-constrained industrial sensing applications requiring high linearity, robust I²C interfacing, and guaranteed operation across harsh environmental conditions.
FAQ
What is the operating temperature range for the LTC2305IMS#TRPBF?
The LTC2305IMS#TRPBF is rated for operation from –40°C to +85°C, with all key specifications-including INL (±1 LSB), SNR (73.5dB), and throughput (14ksps)-guaranteed across this full industrial temperature range. This eliminates the need for derating or additional thermal compensation in factory automation or outdoor equipment deployments.
Does the LTC2305IMS#TRPBF require an external reference voltage?
No, the LTC2305IMS#TRPBF includes a fully integrated 2.5V reference (VREF) and a buffered 4.096V reference output (REFCOMP), both trimmed and temperature-compensated. External references are optional-only required if higher initial accuracy or lower drift than ±25ppm/°C is needed for metrology-grade applications.
How many I²C addresses does the LTC2305IMS#TRPBF support?
The LTC2305IMS#TRPBF supports nine unique I²C addresses via AD1 and AD0 pins, each configurable as LOW, HIGH, or floating. This allows up to nine LTC2305IMS#TRPBF devices to share a single I²C bus without address conflict-ideal for modular sensor arrays or distributed I/O systems.
Can the LTC2305IMS#TRPBF measure both unipolar and bipolar signals?
Yes, the LTC2305IMS#TRPBF supports software-selectable unipolar (0V to 4.096V) and bipolar (±2.048V) input ranges via its 6-bit DIN configuration word. This eliminates external level-shifting circuitry when interfacing with both single-supply sensors and AC-coupled or op-amp-based bipolar signal chains.
What is the minimum acquisition time required before conversion completes?
The LTC2305IMS#TRPBF specifies a 240ns acquisition time (tACQ), which is the minimum duration the analog input must settle before conversion begins. This short acquisition window enables direct drive from low-impedance sources (<100Ω) and simplifies anti-aliasing filter design for bandwidths up to 700kHz full linear bandwidth.
LTC2305IMS#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305IMS#TRPBF FAQ
1.How can I place an order for LTC2305IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305IMS#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 LTC2305IMS#TRPBF reliable?
The price and inventory of LTC2305IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2305IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305IMS#TRPBF?
LTC2305IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305IMS#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 LTC2305IMS#TRPBF?
For technical support, including LTC2305IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305IMS#TRPBF requirements.
6.How does Aetrix verify that LTC2305IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2305IMS#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 LTC2305IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2305IMS#TRPBF?
All LTC2305IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305IMS#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 LTC2305IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2305IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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