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Analog Devices Inc. LTC2305IDE#PBF
- Part No.:
- LTC2305IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2305IDE#PBF.pdf
- Description:
- IC ADC 12BIT SAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
LTC2305IDE#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, ±0.4 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 LTC2305IDE#PBF datasheet, LTC2305IDE#PBF pinout, LTC2305IDE#PBF application, or LTC2305IDE#PBF 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 I²C address flexibility via AD0/AD1 pins.
Technical Context
The LTC2305IDE#PBF implements a capacitive charge-redistribution SAR architecture with internal conversion clock, achieving 1.3μs conversion time and 240ns acquisition time. Its analog input multiplexer supports per-conversion reconfiguration of CH0/CH1 as single-ended or differential pairs using 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 up to 400kHz with Schmitt-triggered SCL/SDA inputs and open-drain SDA output requiring pull-up.
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 sampling of motor current or vibration signals up to 7kHz Nyquist bandwidth. |
| SNR | 73.5dB at 1kHz input - enables >11.9 effective bits for high-fidelity sensor data acquisition. |
| Integral Nonlinearity | ±0.4 LSB (typ), ±1 LSB (max) - limits absolute measurement error to <0.025% FS across full temperature range. |
| Supply Current | 300μA at 1ksps; 225μA in nap mode - extends battery life in portable instrumentation without sacrificing responsiveness. |
| I²C Address Options | 9 unique addresses + global sync via AD0/AD1 three-state pins - allows daisy-chaining up to 9 devices on same bus. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and power supply monitoring. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND). Requires soldering exposed pad to solid ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | All must connect to low-impedance ground plane; Pin 13 (exposed pad) is mandatory GND connection for thermal dissipation. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read (requires pull-up); high-impedance input during write - enables shared bus operation. |
| 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), CH1 (Pin 6) | Analog input channels | Software-selectable single-ended (vs GND) or differential pair; simultaneous sampling eliminates channel skew. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source for improved accuracy. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF grounded - enables external reference substitution. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V range; bypass with 10μF + 0.1μF ceramics - powers analog core and reference circuitry. |
| AD0, AD1 (Pins 12, 11) | I²C address configuration | Three-state (LOW/HIGH/floating) pins set device address; floating state requires ≤10pF capacitance for valid float. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel flexible input topology | CH0/CH1 configurable per conversion as single-ended or differential - eliminates need for external MUX in multi-sensor systems. |
| Internal reference with buffer | 2.5V reference (±25ppm/°C) + 4.096V REFCOMP buffer - reduces BOM count and PCB area vs discrete reference solutions. |
| Low-power nap/sleep modes | 300μA active current at 1ksps; 225μA nap mode; 7μA sleep mode - enables energy-efficient wake-on-event architectures. |
| Guaranteed operation over temperature | Specified from –40°C to +85°C with full parameter validation - suitable for industrial control without derating. |
| I²C address scalability | 9 unique addresses plus global sync command - simplifies firmware development in multi-ADC sensor nodes. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
Use Scenario: Monitoring analog outputs from pressure, temperature, and flow transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing 4–20mA loop receivers with software-selectable bipolar input for zero-based sensors. Use Value: Eliminates external op-amp level-shifting and reference components while maintaining ±0.025% FS linearity over temperature. |
Use Scenario: Sampling phase currents and DC bus voltage in 3-phase inverter gate drivers. IC Role / Device Role / Timing Role: Simultaneous CH0/CH1 sampling captures current/voltage snapshots for precise torque calculation and overcurrent protection. Use Value: 14ksps throughput supports 2kHz PWM carrier frequency with 7x oversampling, improving current reconstruction fidelity. |
| Battery-Operated Instrumentation | Power Supply Monitoring |
Use Scenario: Portable multimeters and handheld analyzers requiring long runtime and high DC accuracy. IC Role / Device Role / Timing Role: Low-noise 12-bit ADC with internal reference and nap mode for intermittent sampling of voltage/current rails. Use Value: 225μA nap current extends coin-cell battery life to >1 year in duty-cycled measurement applications. |
Use Scenario: Real-time monitoring of multiple voltage rails (12V, 5V, 3.3V, 1.8V) in telecom and server PSUs. IC Role / Device Role / Timing Role: Two-channel ADC measuring rail voltage and sense-resistor drop for efficiency calculation and fault detection. Use Value: Software-configurable unipolar/bipolar ranges allow direct measurement of both positive rails and negative bias supplies. |
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. | Limited to single-sensor nodes; lacks I²C address flexibility and dual-channel synchronization. | Select when SPI host interface exists and board space allows external reference; avoid for multi-sensor I²C networks. |
| MAX11612EEE+ | 2-channel, I²C, internal reference, but only 10-bit resolution and 12ksps max throughput - lower DC accuracy and dynamic range. | Suitable for cost-sensitive, lower-precision applications like basic voltage monitoring. | Choose for budget-limited designs where 10-bit resolution suffices and 73.5dB SNR is not required. |
Compared with ADS7822U and MAX11612EEE+, the LTC2305IDE#PBF provides superior 12-bit linearity, higher 14ksps throughput, and integrated I²C addressing - making it optimal for industrial sensor fusion where channel synchronization, noise floor, and bus scalability are critical.
Availability
LTC2305IDE#PBF is available at Aetrix Electronics and suitable for industrial process control, motor feedback systems, and battery-operated instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2305IDE#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, 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#PBF belongs to ADI's precision SAR ADC product line, designed specifically for low-power, space-constrained applications demanding high DC accuracy, low noise, and simple digital interfacing in harsh environments.
FAQ
What is the operating temperature range for the LTC2305IDE#PBF?
The LTC2305IDE#PBF is rated for operation from –40°C to +85°C, with all key specifications-including INL, SNR, and throughput-guaranteed across this full industrial temperature range. This makes the LTC2305IDE#PBF suitable for deployment in motor drives, outdoor instrumentation, and factory automation equipment without thermal derating.
Does the LTC2305IDE#PBF require an external reference?
No, the LTC2305IDE#PBF includes a fully specified internal 2.5V reference (±25ppm/°C) and buffered 4.096V REFCOMP output. External references are optional: VREF can be overdriven with a precision 2.5V source, and REFCOMP can be disabled by grounding VREF to accept an external 4.096V reference - but neither is required for basic operation.
How many I²C addresses does the LTC2305IDE#PBF support?
The LTC2305IDE#PBF supports nine unique I²C addresses determined by the logic states (LOW/HIGH/floating) of AD0 and AD1 pins, plus one global address for synchronized conversions across multiple devices. This enables up to nine LTC2305IDE#PBF units on a single I²C bus without address conflict.
Can the LTC2305IDE#PBF measure both unipolar and bipolar signals?
Yes, the LTC2305IDE#PBF supports software-selectable unipolar (0V to 4.096V) and bipolar (±2.048V) input ranges via the UNI bit in its 6-bit DIN configuration word. This allows direct digitization of AC-coupled sensor outputs or DC-biased transducer signals without external level-shifting circuitry.
What is the minimum acquisition time required for full 12-bit accuracy with the LTC2305IDE#PBF?
The LTC2305IDE#PBF specifies a typical acquisition time (tACQ) of 240ns, which is the minimum time needed after the start of conversion for the internal sample-and-hold to settle to 12-bit accuracy. This value is guaranteed over temperature and applies to both unipolar and bipolar modes when driving from low-impedance sources.
LTC2305IDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305IDE#PBF FAQ
1.How can I place an order for LTC2305IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305IDE#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 LTC2305IDE#PBF reliable?
The price and inventory of LTC2305IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2305IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305IDE#PBF?
LTC2305IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305IDE#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 LTC2305IDE#PBF?
For technical support, including LTC2305IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305IDE#PBF requirements.
6.How does Aetrix verify that LTC2305IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2305IDE#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 LTC2305IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2305IDE#PBF?
All LTC2305IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305IDE#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 LTC2305IDE#PBF part is unused and in its original packaging.
Return procedure for LTC2305IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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