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Analog Devices Inc. LTC2305CDE#TRPBF
- Part No.:
- LTC2305CDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2305CDE#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
LTC2305CDE#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 - used in precision industrial sensor interfaces and battery-powered data acquisition systems.
For engineers reviewing the LTC2305CDE#TRPBF datasheet, LTC2305CDE#TRPBF pinout, LTC2305CDE#TRPBF application, or LTC2305CDE#TRPBF equivalent, key selection criteria include its dual-channel software-selectable unipolar/bipolar input range, 1.3μs conversion time, low 300μA active current at 1ksps, and operation across 0°C to 70°C in a 12-pin 4mm × 3mm DFN package.
Technical Context
The LTC2305CDE#TRPBF implements a 12-bit SAR architecture with internal charge-redistribution DAC and differential comparator, supporting both single-ended and differential analog input configurations via programmable S/D and O/S bits. Its I²C interface operates at up to 400kHz with nine configurable slave addresses plus global sync, and conversion is initiated by STOP condition after address acknowledgment.
It integrates a 2.5V internal reference (±25ppm/°C tempco) and 4.096V buffered REFCOMP output, with internal clocking enabling fixed 1.3μs conversion time independent of external timing. The analog input multiplexer allows per-conversion reconfiguration of CH0/CH1 polarity and mode, enabling dynamic channel routing without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for control-loop stability. |
| Throughput Rate | 14ksps maximum - supports real-time monitoring of fast transients in motor control feedback paths. |
| SNR | 73.5dB at 1kHz - enables >11.5 effective bits for high-fidelity sensor signal digitization. |
| INL | ±1 LSB max - limits end-point error to <0.024% FS, critical for calibrated measurement systems. |
| Supply Current | 300μA at 1ksps, 225μA nap mode - extends battery life in portable instrumentation beyond 1 year. |
| I²C Clock Frequency | 400kHz max - compatible with standard-mode I²C controllers without custom timing logic. |
| Input Range | Software-selectable 0V–4.096V unipolar or ±2.048V bipolar - eliminates external level-shifting for diverse sensor outputs. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND), θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Three dedicated ground pins minimize ground bounce and improve PSRR in mixed-signal layouts. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output requiring pull-up; carries 16-bit frame (12 data + 4 trailing zeros) during read operations. |
| SCL (Pin 3) | I²C clock input | Slave-only interface; data latched on rising edge, shifted out on falling edge per I²C spec. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ or IN− via DIN word; supports single-ended (vs GND) or differential pairing with CH1. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential mode; independently selectable polarity enables flexible sensor interfacing. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic; can be overdriven by external 2.5V source for improved accuracy or tempco. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF; disabled when VREF grounded - allows external reference injection. |
| 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 bits | Three-state inputs (LOW/HIGH/floating) set one of nine slave addresses - enables multi-device bus sharing. |
| 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 | Per-conversion reconfiguration of CH0/CH1 polarity and unipolar/bipolar mode via 6-bit DIN word - enables adaptive sensor scanning without firmware reload. |
| Internal reference with buffer | 2.5V reference (±25ppm/°C) + 4.096V REFCOMP output - eliminates external reference IC, saves 3–4 mm² PCB area and BOM cost. |
| Low-power nap/sleep modes | 225μA nap current, 7μA sleep current - reduces average power by >95% during idle periods in duty-cycled DAQ systems. |
| Guaranteed operation to 70°C | Specified performance across full industrial temperature range - avoids derating or thermal margining in enclosed enclosures. |
| High CMRR (70dB) | Rejects common-mode noise from shared sensor grounds or noisy environments - improves accuracy in motor drive current sensing. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
Use Scenario: Monitoring multiple analog sensor outputs (pressure, temperature, flow) in PLC I/O modules with space-constrained PCB layout. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing 4–20mA loop signals and thermocouple outputs with simultaneous sampling capability. Use Value: Eliminates need for two separate ADCs or external multiplexers, reducing component count and board area by 35% versus discrete solutions. | Use Scenario: Closed-loop current and voltage sensing in BLDC motor inverters with isolated gate drivers. IC Role / Device Role / Timing Role: High-speed sampling of phase currents and DC-link voltage with precise timing alignment between channels. Use Value: 1.3μs conversion time and per-cycle MUX reconfiguration enable accurate field-oriented control at 20kHz PWM frequencies. |
| Battery-Powered Instrumentation | Remote Environmental Monitoring |
Use Scenario: Portable multimeter or handheld data logger powered by two AA cells with >12-month battery life requirement. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 10sps intervals, entering sleep mode between samples. Use Value: 7μA sleep current and integrated reference reduce total system quiescent current to <15μA - extends runtime beyond specification. | Use Scenario: Wireless sensor node measuring soil moisture and ambient temperature in agricultural IoT deployments. IC Role / Device Role / Timing Role: Dual-channel digitization of resistive humidity sensor and thermistor with automatic range switching. Use Value: Software-selectable unipolar/bipolar input accommodates both ratiometric and offset-based sensor bridges without external op-amps. |
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 layout complexity due to external ref and SPI routing. | Select only if existing design uses SPI and requires lower cost per channel with external reference reuse. |
| MAX11612EEE+ | 2-channel, I²C, internal 2.048V ref, 12-bit, but only 9.6ksps max throughput and 70dB SNR. | Lower dynamic performance limits use in high-fidelity audio or vibration analysis; smaller temp range (–40°C to +85°C). | Choose when budget is primary constraint and 73.5dB SNR or 14ksps is not required for target application. |
Compared with ADS7822U and MAX11612EEE+, the LTC2305CDE#TRPBF provides superior dual-channel flexibility, higher SNR, faster throughput, and integrated 4.096V reference buffering - making it optimal for space- and power-sensitive industrial DAQ where I²C compatibility and precision are mandatory.
Availability
LTC2305CDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and battery-powered instrumentation requiring stable component supply and long-term production continuity.
Supply support for LTC2305CDE#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 LTC2305CDE#TRPBF belongs to ADI's precision SAR ADC product line, designed specifically for low-power, space-constrained applications demanding high DC accuracy, excellent dynamic performance, and simplified system integration via integrated references and I²C interface.
FAQ
What is the operating temperature range for the LTC2305CDE#TRPBF?
The LTC2305CDE#TRPBF is specified for operation from 0°C to 70°C - the 'C' grade designation indicates commercial temperature range. This range is validated across all electrical parameters including INL, SNR, and reference stability, making it suitable for indoor industrial equipment and consumer-grade test instruments where ambient temperatures remain within this envelope. The DFN package's thermal performance (θJA = 43°C/W) ensures reliable operation without forced cooling under typical load conditions.
Does the LTC2305CDE#TRPBF require external reference components?
No, the LTC2305CDE#TRPBF does not require external reference components for basic operation. It integrates a 2.5V internal reference (VREF) and a buffered 4.096V output (REFCOMP), both internally trimmed and temperature-compensated. External bypass capacitors (2.2μF on VREF, 10μF + 0.1μF on REFCOMP) are mandatory per datasheet layout guidelines, but no external reference IC or resistor network is needed - reducing BOM count and PCB footprint while maintaining ±1 LSB INL across temperature.
How many I²C addresses does the LTC2305CDE#TRPBF support?
The LTC2305CDE#TRPBF supports nine unique I²C slave addresses via the AD1 and AD0 pins, each configurable as LOW, HIGH, or floating (three states per pin). This yields 3² = 9 distinct addresses, plus one global address for synchronized wake-up or broadcast commands. All addresses operate within standard-mode I²C (up to 400kHz), enabling up to nine LTC2305CDE#TRPBF devices on a single bus without address conflict - ideal for multi-sensor nodes or modular DAQ systems.
Can the LTC2305CDE#TRPBF perform simultaneous sampling on both channels?
No, the LTC2305CDE#TRPBF does not support true simultaneous sampling. It uses a single SAR core with an internal analog multiplexer, meaning CH0 and CH1 are sampled sequentially - first one channel, then the other - with typical inter-channel delay under 100ns. However, the MUX configuration can be changed on a per-conversion basis via the DIN word, allowing rapid alternation between channels or differential pairs without interrupting the conversion stream, which meets timing requirements for most motor control and process monitoring applications.
What is the minimum acquisition time required for full 12-bit accuracy with the LTC2305CDE#TRPBF?
The minimum acquisition time required for full 12-bit accuracy with the LTC2305CDE#TRPBF is 240ns, as specified in the ADC Timing Characteristics table. This time allows the internal sample-and-hold capacitor to settle to within 1/2 LSB of final value after MUX switching. For source impedances below 1kΩ, this time is sufficient; higher-impedance sources may require longer acquisition windows or external RC filtering to ensure complete settling before conversion initiation.
LTC2305CDE#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305CDE#TRPBF FAQ
1.How can I place an order for LTC2305CDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305CDE#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 LTC2305CDE#TRPBF reliable?
The price and inventory of LTC2305CDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305CDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2305CDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305CDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305CDE#TRPBF?
LTC2305CDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305CDE#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 LTC2305CDE#TRPBF?
For technical support, including LTC2305CDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305CDE#TRPBF requirements.
6.How does Aetrix verify that LTC2305CDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2305CDE#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 LTC2305CDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2305CDE#TRPBF?
All LTC2305CDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305CDE#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 LTC2305CDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2305CDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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