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Analog Devices Inc. LTC2305HMS#PBF
- Part No.:
- LTC2305HMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2305HMS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
LTC2305HMS#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, ±1 LSB integral nonlinearity, and 14ksps throughput at 1.5mW power-ideal for precision industrial sensor monitoring requiring bipolar/unipolar input flexibility and high-temperature operation.
For engineers reviewing the LTC2305HMS#PBF datasheet, LTC2305HMS#PBF pinout, LTC2305HMS#PBF application, or LTC2305HMS#PBF equivalent, key selection criteria include guaranteed operation from –40°C to 125°C, 2-wire I²C addressability via AD0/AD1 pins, software-selectable unipolar/bipolar input ranges, and channel-to-channel isolation of –109dB at 1kHz.
Technical Context
The LTC2305HMS#PBF implements a 12-bit SAR architecture with internal conversion clock and fully differential sample-and-hold circuitry, enabling simultaneous sampling of CH0 and CH1 inputs to suppress common-mode noise. Its analog multiplexer supports single-ended or differential configurations per channel, controlled by S/D and O/S bits in the 6-bit DIN word.
It integrates a buffered 4.096V REFCOMP output and 2.5V VREF output with ±25ppm/°C tempco, both internally bypassed via dedicated capacitor pads. The I²C interface operates up to 400kHz with Schmitt-triggered SCL/SDA inputs and supports nine device addresses plus global sync-no external clock or timing control required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes-ensures monotonic transfer function for closed-loop control stability. |
| Throughput Rate | 14ksps-supports real-time motor current sampling at 1.3μs conversion time per reading. |
| SNR | 73.5dB at 1kHz-enables >11.5 effective bits for accelerometer or strain gauge signal fidelity. |
| INL | ±1 LSB max over –40°C to 125°C-meets industrial calibration accuracy requirements without per-unit trimming. |
| Supply | Single 5V (4.75V–5.25V)-simplifies power design; draws only 300μA at 1ksps and 225μA in nap mode. |
| Input Range | Software-selectable 0V–4.096V unipolar or ±2.048V bipolar-eliminates external level-shifting for mixed-signal systems. |
| Channel Isolation | –109dB at 1kHz-prevents crosstalk between CH0 (e.g., temperature) and CH1 (e.g., voltage) measurements. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), exposed pad grounded, rated for –40°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | All three GND pins must connect to solid ground plane; pin 9 serves as primary analog ground return path. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read (conversion result); high-impedance input during write (DIN configuration); 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; supports 400kHz standard/fast mode. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as single-ended (vs GND) or differential (with CH1); polarity selectable via O/S bit in DIN word. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential measurement or used independently; matched full-scale error ±2 LSB ensures ratiometric accuracy. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source to improve stability or tempco. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF is grounded-allows external 4.096V source injection. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V range; bypass with 10μF + 0.1μF ceramics; powers internal reference, SAR core, and I²C logic. |
| AD1 / AD0 (Pins 11, 12) | I²C address select | Three-state inputs (LOW/HIGH/floating) set one of nine device addresses; enable multi-drop bus without external address jumpers. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference with ±25ppm/°C drift | Eliminates external reference IC and reduces BOM count while maintaining <±1 LSB error across –40°C to 125°C. |
| Software-configurable unipolar/bipolar input | Enables single hardware design to support both 0–4.096V sensor outputs and ±2.048V bridge amplifier signals without PCB changes. |
| Channel-to-channel isolation –109dB | Prevents interference between simultaneous CH0 (e.g., battery voltage) and CH1 (e.g., load current) measurements in power management systems. |
| Nap mode power: 225μA at 1ksps | Extends battery life in portable instrumentation by reducing average current versus continuous sampling at full rate. |
| Guaranteed operation to 125°C | Validated for under-hood automotive or industrial motor drive environments where ambient temperatures exceed 85°C. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
Use Scenario: Monitoring multiple analog process variables (e.g., pressure, flow, temperature) in PLC I/O modules with limited board space. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two independent 4–20mA loop receivers or RTD bridges using software-selected bipolar/unipolar modes. Use Value: Reduces component count vs two single-channel ADCs; internal reference eliminates need for external precision voltage source. | Use Scenario: Sampling phase currents and DC bus voltage in 3-phase inverter drives operating at junction temperatures up to 125°C. IC Role / Device Role / Timing Role: Simultaneous acquisition of CH0 (current sense) and CH1 (voltage sense) with 14ksps throughput and –109dB channel isolation. Use Value: Enables accurate field-oriented control without external anti-aliasing filters due to 700kHz full linear bandwidth. |
| Accelerometer Measurements | Power Supply Monitoring |
Use Scenario: Digitizing low-noise ±2g MEMS accelerometer outputs in structural health monitoring nodes deployed in harsh thermal environments. IC Role / Device Role / Timing Role: Bipolar-input ADC capturing differential accelerometer signals with 73.5dB SNR and 12-bit resolution at 14ksps. Use Value: Internal differential sample-and-hold rejects common-mode vibration noise; no external op-amp buffering required. | Use Scenario: Real-time monitoring of 12V/5V/3.3V rails and backup battery voltage in telecom base station power shelves. IC Role / Device Role / Timing Role: Unipolar-mode ADC measuring multiple rail voltages via resistor dividers, leveraging 9 I²C addresses for scalable multi-rail sensing. Use Value: AD0/AD1 address pins allow up to nine LTC2305HMS#PBF devices on one I²C bus-reducing MCU GPIO and firmware complexity. |
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 | 12-bit, single-supply 2.7–5.25V, SPI interface only, no internal reference, 200ksps max | Requires external reference and SPI host; higher speed but incompatible bus protocol | Select if system already uses SPI and needs >14ksps; not drop-in for I²C-based designs. |
| MAX11607AUT+T | 12-bit, 2-channel, I²C interface, internal 2.048V reference, –40°C to +85°C rating | Limited to 85°C operation; lower SNR (70dB) and no bipolar mode support | Acceptable for commercial-temperature applications where bipolar input is unnecessary and cost is critical. |
Compared with ADS7822U and MAX11607AUT+T, the LTC2305HMS#PBF uniquely combines extended temperature operation (–40°C to 125°C), integrated 4.096V REFCOMP buffer, software-selectable bipolar/unipolar input, and guaranteed channel matching-making it the only option qualified for high-reliability industrial motor control and automotive under-hood sensing.
Availability
LTC2305HMS#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, accelerometer measurements, and power supply monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC2305HMS#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 LTC2305HMS#PBF belongs to ADI's precision data acquisition product line, designed specifically for space-constrained, low-power, high-temperature applications demanding robust I²C interfacing and metrology-grade accuracy without external support components.
FAQ
What is the maximum operating temperature specification for the LTC2305HMS#PBF?
The LTC2305HMS#PBF is rated for guaranteed operation from –40°C to +125°C, as confirmed by its "H" grade designation in the order information table. This extends beyond standard industrial (–40°C to +85°C) and commercial (0°C to +70°C) grades, making it suitable for under-hood automotive or high-ambient industrial environments where junction temperatures may exceed 105°C.
Does the LTC2305HMS#PBF require an external reference voltage?
No, the LTC2305HMS#PBF does not require an external reference voltage. It integrates a precision 2.5V internal reference (VREF) and a buffered 4.096V reference output (REFCOMP), both specified over the full –40°C to 125°C range. External references may be used by overdriving VREF or REFCOMP, but are optional-not required-for basic operation.
How many I²C addresses does the LTC2305HMS#PBF support?
The LTC2305HMS#PBF supports nine unique I²C addresses via the AD0 and AD1 pins, which accept LOW, HIGH, or floating states. This enables up to nine devices on a single I²C bus without address conflicts. Additionally, it supports a global address for synchronized conversions across multiple LTC2305HMS#PBF units in multi-channel systems.
Can the LTC2305HMS#PBF measure both unipolar and bipolar input signals?
Yes, the LTC2305HMS#PBF supports both unipolar (0V to 4.096V) and bipolar (±2.048V) input ranges, selected dynamically via the UNI bit in the 6-bit DIN configuration word. This allows a single hardware design to interface with diverse sensors-including 4–20mA transmitters (unipolar) and Wheatstone bridge amplifiers (bipolar)-without external level-shifting circuitry.
What is the typical power consumption of the LTC2305HMS#PBF at 1ksps?
At a throughput rate of 1ksps, the LTC2305HMS#PBF draws 300μA from a 5V supply, equating to 1.5mW total power dissipation. In nap mode (SLP bit = 0, conversion complete), supply current drops to 225μA; in sleep mode (SLP bit = 1), it further reduces to 7μA (35μW), enabling ultra-low-power operation in battery-powered instrumentation.
LTC2305HMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- 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 ~ 125°C
- Supplier Device Package:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305HMS#PBF FAQ
1.How can I place an order for LTC2305HMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305HMS#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 LTC2305HMS#PBF reliable?
The price and inventory of LTC2305HMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305HMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2305HMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305HMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305HMS#PBF?
LTC2305HMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305HMS#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 LTC2305HMS#PBF?
For technical support, including LTC2305HMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305HMS#PBF requirements.
6.How does Aetrix verify that LTC2305HMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2305HMS#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 LTC2305HMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2305HMS#PBF?
All LTC2305HMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305HMS#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 LTC2305HMS#PBF part is unused and in its original packaging.
Return procedure for LTC2305HMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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