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Analog Devices Inc. LTC1865ACMS#PBF
- Part No.:
- LTC1865ACMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865ACMS#PBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,843
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Product details
Overview
LTC1865ACMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with integrated sample-and-hold and software-selectable 2-channel multiplexer in a 10-lead MSOP package. It operates on a single 5V supply, draws only 850μA at full speed, and features adjustable reference input, SPI/MICROWIRE-compatible serial interface, and guaranteed operation from 0°C to 70°C - ideal for portable instrumentation and isolated data acquisition.
For engineers reviewing the LTC1865ACMS#PBF datasheet, LTC1865ACMS#PBF pinout, LTC1865ACMS#PBF application, or LTC1865ACMS#PBF equivalent, key selection criteria include its 16-bit resolution at 250ksps, true differential MUX input architecture, auto-shutdown current reduction to 2μA at 1ksps, and MSOP-10 thermal performance (θJA = 210°C/W).
Technical Context
The LTC1865ACMS#PBF implements a switched-capacitor SAR architecture with internal sample-and-hold, supporting both single-ended and differential input configurations via a 2-bit SDI control word. Its conversion timing is deterministic: tCONV = 3.2μs max at 250ksps, synchronized by external SCK with full-duplex serial I/O.
It uses separate AGND and DGND pins for analog/digital domain isolation, requires low-noise 1μF bypassing on VCC and VREF, and supports reference voltages from 1V to VCC - enabling ratiometric measurements or precision external reference use without gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = VREF/65536 quantization step for high-precision sensor or process monitoring. |
| Max Sampling Rate | 250ksps - supports Nyquist-limited bandwidth up to 125kHz (full linear BW), suitable for vibration analysis or motor current sampling. |
| Supply Current | 850μA typical at 250ksps; drops to 2μA at 1ksps - enables battery life extension in portable systems via automatic power-down between conversions. |
| INL Error | ±6 LSB max - ensures monotonicity and <1 LSB linearity error over full scale, critical for closed-loop control feedback accuracy. |
| SNR | 87 dB - provides >14.5 effective number of bits (ENOB), sufficient for high-fidelity audio or medical signal digitization. |
| Reference Range | 1V to VCC (5V) - allows direct interfacing with low-voltage sensors or external precision references like LT1021-5 without level-shifting. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded systems including test equipment and industrial HMIs. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm, 0.5mm pitch), θJA = 210°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Input | Active-high trigger initiating conversion; held high after completion forces auto-shutdown mode. |
| CH0 / CH1 | Analog Input Channels | Software-multiplexed inputs supporting single-ended (vs GND) or differential (CH0–CH1) measurement per SDI command. |
| AGND | Analog Ground | Primary analog return path; must connect directly to low-impedance analog ground plane to minimize noise coupling. |
| DGND | Digital Ground | Digital return for SDO/SDI/SCK; tied to AGND at single point to prevent digital switching noise from modulating analog conversion. |
| SDI | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges before conversion starts - enables dynamic channel selection. |
| SDO | Serial Data Output | Outputs 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV is high. |
| SCK | Serial Clock Input | Master clock synchronizing full-duplex data transfer; supports up to 20MHz (H-grade) for minimal conversion overhead. |
| VCC | Positive Supply | Single 4.75V–5.25V supply powering analog and digital sections; requires local 1μF tantalum bypass to AGND. |
| VREF | Reference Input | Defines full-scale range (1V–5V); high-impedance input enabling direct connection to precision voltage references or ratiometric sensor bridges. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software MUX | Enables dual-sensor monitoring (e.g., temperature + pressure) with no external analog switches or layout changes. |
| Auto Shutdown Mode | Reduces current from 850μA to 2μA at 1ksps - extends coin-cell battery life to multi-year operation in wireless sensor nodes. |
| True Differential Input Architecture | Rejects common-mode noise up to 125kHz bandwidth, eliminating need for external instrumentation amplifiers in noisy industrial environments. |
| 16-Bit No-Missing-Codes | Guarantees monotonic transfer function across full temperature range - essential for position encoders and servo loop stability. |
| MSOP-10 Thermal Performance | θJA = 210°C/W allows operation at full speed in compact enclosures without forced air cooling. |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter digitizing AC/DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Primary 16-bit ADC acquiring sampled sensor outputs; MUX selects between shunt resistor, divider network, and thermistor paths. Use Value: 250ksps sampling captures transient events (e.g., arc detection); 850μA supply current enables >100 hours runtime on two AA cells. | Use Scenario: Industrial PLC analog input module measuring 4–20mA loop signals across galvanically isolated barriers. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop outputs; VREF tied to isolated precision reference for ratiometric accuracy. Use Value: ±6 LSB INL ensures <0.1% FSR error over temperature; differential inputs reject common-mode noise from motor drives. |
| Low-Power Battery Monitoring | Motor Control Feedback |
Use Scenario: Smart battery pack monitoring cell voltages and temperatures in drones or medical devices. IC Role / Device Role / Timing Role: Dual-channel ADC sequentially measuring individual Li-ion cell voltages (CH0) and NTC thermistor (CH1) every 100ms. Use Value: Auto shutdown reduces average current to ~10μA during idle periods; 1V min VREF supports low-voltage cell stack monitoring. | Use Scenario: Inverter drive sensing phase currents and DC bus voltage for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed ADC capturing current sense amplifier outputs synchronized to PWM dead-time; 250ksps supports 20kHz switching frequency with 12+ samples per cycle. Use Value: 87dB SNR enables accurate current reconstruction; 3.2μs conversion time minimizes control loop latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, 2.5V–5V supply; no internal MUX; higher power (1.5mA @ 1MSPS) | Higher speed but lacks software-selectable dual inputs; requires external MUX for multi-channel use | Select when sampling rate >250ksps is required and channel count is fixed or externally managed. |
| AD7682BRMZ | 16-bit, 250ksps, pseudo-differential inputs, 2.3V–5.5V supply; no MUX; 1.4mA typical current | Single-channel only; uses simplified SPI protocol (no SDI config); lower integration than LTC1865ACMS#PBF | Select for cost-sensitive single-input designs where MUX flexibility is unnecessary and wider supply range is beneficial. |
Compared with ADS8860IDRCT and AD7682BRMZ, the LTC1865ACMS#PBF uniquely integrates a 2-channel software MUX and ultra-low 850μA active current in a 10-pin MSOP - reducing BOM count and PCB area while maintaining 250ksps throughput and commercial temperature grade.
Availability
LTC1865ACMS#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power battery monitoring requiring stable component supply and long-term production continuity.
Supply support for LTC1865ACMS#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, formed through the acquisition of Linear Technology in 2017.
The LTC1865ACMS#PBF belongs to Linear's legacy precision data acquisition product line, designed specifically for space-constrained, low-power, high-resolution measurement systems where integration, power efficiency, and ease of use are prioritized over raw speed.
FAQ
What is the maximum sampling rate supported by the LTC1865ACMS#PBF?
The LTC1865ACMS#PBF supports a maximum sampling rate of 250ksps under recommended operating conditions (VCC = 5V, fSCK ≤ 20MHz). At this rate, conversion time is guaranteed ≤3.2μs, and supply current remains at 850μA typical. The device automatically powers down between conversions to reduce current at lower sampling frequencies.
Does the LTC1865ACMS#PBF require an external reference voltage?
No - the LTC1865ACMS#PBF accepts an adjustable external reference voltage (1V to VCC) on the VREF pin, but it does not require one. When used in ratiometric mode (e.g., with bridge sensors), VREF can be derived from the same supply as the sensor excitation, eliminating drift errors. The MSOP version does not tie VREF internally to VCC, unlike the SO-8 variant.
How many analog input channels does the LTC1865ACMS#PBF support?
The LTC1865ACMS#PBF supports two analog input channels (CH0 and CH1) selectable via a 2-bit configuration word sent on the SDI pin before each conversion. It offers four modes: single-ended CH0, single-ended CH1, differential CH0–CH1, and differential CH1–CH0 - all implemented without external components.
What is the operating temperature range for the LTC1865ACMS#PBF?
The LTC1865ACMS#PBF is specified for commercial temperature operation from 0°C to 70°C. This grade (denoted by "C" in the part number) is validated across that full range for all key parameters including INL (±6 LSB), SNR (87 dB), and supply current (850μA typ at 250ksps).
Can the LTC1865ACMS#PBF interface directly with a microcontroller SPI port?
Yes - the LTC1865ACMS#PBF is SPI/MICROWIRE-compatible with standard 3-wire serial interface (SCK, SDO, SDI) and supports full-duplex communication. It requires no special framing or timing beyond standard SPI mode 0 (CPOL = 0, CPHA = 0), and CONV serves as chip select. Microcontroller GPIO can drive CONV to initiate conversions and manage power state.
LTC1865ACMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865ACMS#PBF FAQ
1.How can I place an order for LTC1865ACMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865ACMS#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 LTC1865ACMS#PBF reliable?
The price and inventory of LTC1865ACMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865ACMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865ACMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865ACMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865ACMS#PBF?
LTC1865ACMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865ACMS#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 LTC1865ACMS#PBF?
For technical support, including LTC1865ACMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865ACMS#PBF requirements.
6.How does Aetrix verify that LTC1865ACMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865ACMS#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 LTC1865ACMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865ACMS#PBF?
All LTC1865ACMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865ACMS#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 LTC1865ACMS#PBF part is unused and in its original packaging.
Return procedure for LTC1865ACMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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