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Analog Devices Inc. LTC2305IDE#TRPBF
- Part No.:
- LTC2305IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2305IDE#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
LTC2305IDE#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 circuit. It operates from a single 5V supply, achieves 14ksps throughput and 1.3μs conversion time, and supports software-selectable unipolar (0V to 4.096V) or bipolar (±2.048V) input ranges - ideal for precision sensor monitoring in space-constrained industrial systems.
For engineers reviewing the LTC2305IDE#TRPBF datasheet, LTC2305IDE#TRPBF pinout, LTC2305IDE#TRPBF application, or LTC2305IDE#TRPBF equivalent, key selection considerations include its dual-channel multiplexing capability, guaranteed no missing codes, –40°C to 85°C operating range, low 73.5dB SNR, and I²C address configurability via AD0/AD1 pins.
Technical Context
The LTC2305IDE#TRPBF implements a capacitive charge-redistribution SAR architecture with internal clocking, eliminating external timing components. Its analog input multiplexer supports dynamic reconfiguration between single-ended CH0/CH1 inputs or differential pairs per conversion cycle using the 6-bit DIN word's S/D and O/S bits.
It integrates a buffered 4.096V reference output (REFCOMP) and 2.5V reference output (VREF), both requiring specific bypassing (10μF + 0.1μF and 2.2μF respectively). The device enters nap mode after conversion, reducing supply current to 7μA while maintaining readiness for new commands via I²C.
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 - enables real-time sampling of motor current or accelerometer signals up to ~7kHz Nyquist bandwidth. |
| SNR | 73.5dB at 1kHz - supports >11.9 effective bits for high-fidelity sensor digitization. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - matches common transducer outputs without external level-shifting. |
| Supply Current | 300μA at 1ksps; 7μA in nap mode - extends battery life in portable instrumentation. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor drives and PLC I/O modules. |
| I²C Address | 9 configurable addresses plus global sync - allows daisy-chaining multiple LTC2305 devices on one bus. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND), RoHS-compliant, rated for θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Must connect to solid ground plane; all three pins reduce impedance and improve noise immunity. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read; high-impedance input during write - requires external pull-up to VDD. |
| SCL (Pin 3) | I²C clock input | Slave-only interface; data latched on rising edge, shifted out on falling edge. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ or IN− via DIN word; supports single-ended or differential acquisition. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential mode or used independently for sequential single-ended sampling. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF is grounded - enables external reference substitution. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V range; bypass with 10μF + 0.1μF ceramics to suppress supply noise coupling into conversion. |
| AD1 / AD0 (Pins 11, 12) | I²C address select bits | Three-state (LOW/HIGH/floating) configuration yields 9 unique addresses - avoids bus conflicts in multi-device systems. |
| GND (Pin 13) | Exposed thermal pad | Mandatory solder connection to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel programmable MUX | Enables per-conversion reconfiguration between CH0/CH1 single-ended or differential pairs - eliminates need for external analog switches in multi-sensor systems. |
| Internal reference with REFCOMP buffer | 4.096V buffered output provides stable scaling for unipolar/bipolar modes - removes external reference IC and saves board area. |
| Low-noise SAR architecture | 73.5dB SNR and <±1 LSB INL ensure accurate digitization of low-level signals like strain gauges or thermocouples without post-calibration. |
| I²C address flexibility | AD0/AD1 pins support 9 discrete addresses - simplifies firmware design in systems with multiple LTC2305IDE#TRPBF units sharing one controller. |
| Nap mode power management | Reduces current to 7μA between conversions - critical for battery-powered data loggers requiring long-term autonomous operation. |
Applications
| Industrial Process Control | Motor Control |
|---|---|
Use Scenario: Monitoring analog feedback signals from pressure, temperature, and flow sensors in distributed I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two independent 4–20mA loop receivers or RTD bridges simultaneously with synchronized sampling. Use Value: Software-selectable bipolar/unipolar range eliminates external signal conditioning; I²C interface reduces MCU GPIO count and simplifies layout. | Use Scenario: Sampling phase currents and DC bus voltage in BLDC or servo drive inverters. IC Role / Device Role / Timing Role: LTC2305IDE#TRPBF captures CH0 (current sense) and CH1 (bus voltage) with <1.3μs conversion latency for real-time current regulation. Use Value: 12-bit resolution and 73.5dB SNR enable precise torque control; nap mode minimizes idle power in intermittent duty cycles. |
| Accelerometer Measurements | Battery Operated Instruments |
Use Scenario: Digitizing outputs from dual-axis MEMS accelerometers in structural health monitoring nodes. IC Role / Device Role / Timing Role: Configured for differential CH0/CH1 acquisition to reject common-mode vibration noise and improve dynamic range. Use Value: Fully differential sample-and-hold rejects mechanical noise; 14ksps throughput supports >7kHz vibration analysis without aliasing. | Use Scenario: Portable multimeters or handheld environmental sensors requiring long battery life and compact form factor. IC Role / Device Role / Timing Role: LTC2305IDE#TRPBF interfaces directly to microcontroller I²C port, converting sensor outputs while consuming only 7μA in nap mode. Use Value: Integrated 2.5V reference and 4.096V REFCOMP eliminate external components; DFN package saves >40% board area vs MSOP. |
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 | Single-channel, SPI interface, no internal reference - requires external 2.5V ref and level-shifting for 5V systems. | Not suitable for dual-channel or I²C-bus constrained designs; higher BOM cost due to external reference and level shifters. | Select only if SPI interface and lower channel count align with system architecture and board space permits added components. |
| MAX11603EEE+ | 2-channel, I²C, 12-bit, but uses internal 2.048V reference and lacks REFCOMP buffer - limits unipolar full-scale to 2.048V. | Cannot support 4.096V unipolar range without external gain; lower SNR (70dB) reduces effective resolution in noise-sensitive applications. | Consider only for cost-sensitive designs where 2.048V full-scale and reduced dynamic performance are acceptable trade-offs. |
Compared with ADS7822U and MAX11603EEE+, the LTC2305IDE#TRPBF delivers dual-channel flexibility, integrated 4.096V REFCOMP for direct unipolar scaling, superior 73.5dB SNR, and lower nap-mode current - making it optimal for compact, high-accuracy, I²C-based sensor systems.
Availability
LTC2305IDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control, and battery-operated instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2305IDE#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 LTC2305IDE#TRPBF belongs to ADI's precision data acquisition product line, designed specifically for low-power, space-constrained systems needing reliable I²C-interfaced ADCs with integrated references and wide industrial temperature operation.
FAQ
What is the maximum sampling rate supported by the LTC2305IDE#TRPBF?
The LTC2305IDE#TRPBF supports a maximum throughput rate of 14ksps under standard operating conditions (VDD = 5V, TA = 25°C). This rate is achievable with the internal conversion clock and guarantees 1.3μs conversion time per sample. At this rate, the device maintains 73.5dB SNR and <±1 LSB integral nonlinearity - critical for high-fidelity sensor digitization in real-time control loops.
Does the LTC2305IDE#TRPBF require an external reference voltage?
No, the LTC2305IDE#TRPBF does not require an external reference voltage. It integrates a precision 2.5V reference (VREF) and a buffered 4.096V reference (REFCOMP) that serve as the conversion基准 for both unipolar and bipolar input ranges. External references may be applied only if overriding the internal ones - for example, grounding VREF disables the REFCOMP buffer to allow an external 4.096V source.
How many I²C addresses can be configured for the LTC2305IDE#TRPBF?
The LTC2305IDE#TRPBF supports nine unique I²C addresses via the AD0 and AD1 pins, which accept LOW, HIGH, or floating states. This configuration enables up to nine LTC2305IDE#TRPBF devices on a single I²C bus without address conflict. An additional global address allows simultaneous wake-up or synchronization across multiple units - essential for coordinated multi-node sensing.
What is the operating temperature range for the LTC2305IDE#TRPBF?
The LTC2305IDE#TRPBF is specified for operation from –40°C to +85°C, corresponding to the "I" grade temperature rating. This range is validated across all electrical parameters including INL, SNR, and supply current - ensuring reliable performance in industrial enclosures, motor drive cabinets, and outdoor instrumentation without derating or thermal management overhead.
Can the LTC2305IDE#TRPBF perform differential measurements between CH0 and CH1?
Yes, the LTC2305IDE#TRPBF supports true differential measurement between CH0 and CH1 using the analog input multiplexer controlled by the S/D and O/S bits in the 6-bit DIN word. When configured for differential mode, the device samples both channels simultaneously with full common-mode rejection, enabling high-accuracy ratiometric measurements of bridge sensors or isolated transducers without external instrumentation amplifiers.
LTC2305IDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305IDE#TRPBF FAQ
1.How can I place an order for LTC2305IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305IDE#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 LTC2305IDE#TRPBF reliable?
The price and inventory of LTC2305IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2305IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305IDE#TRPBF?
LTC2305IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305IDE#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 LTC2305IDE#TRPBF?
For technical support, including LTC2305IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305IDE#TRPBF requirements.
6.How does Aetrix verify that LTC2305IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2305IDE#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 LTC2305IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2305IDE#TRPBF?
All LTC2305IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305IDE#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 LTC2305IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2305IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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