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Analog Devices Inc. LTC1865ACS8#TRPBF
- Part No.:
- LTC1865ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865ACS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
LTC1865ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with software-selectable dual-channel multiplexer, operating on a single 5V supply in an 8-lead SO package. It features true differential input capability, adjustable reference input, auto shutdown reducing supply current to 2μA at 1ksps, and SPI/MICROWIRE™-compatible serial interface. It is designed for high-precision, low-power data acquisition in compact instrumentation.
For engineers reviewing the LTC1865ACS8#TRPBF datasheet, LTC1865ACS8#TRPBF pinout, LTC1865ACS8#TRPBF application, or LTC1865ACS8#TRPBF equivalent, key selection criteria include its 2-channel MUX configuration in SO-8, guaranteed 0°C to 70°C operation, VREF-tied-to-VCC architecture in SO-8, and compatibility with ratiometric or external reference systems requiring ≤1LSB INL and 87dB SNR.
Technical Context
The LTC1865ACS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and a 2-bit configuration word accepted via SDI during CONV-low phase. Its SO-8 variant fixes VREF internally to VCC, defining a rail-to-rail input span of 0V to VCC, unlike the MSOP version which supports external VREF down to 1V.
It uses a 3-wire serial interface (SCK, SDO, SDI) with full-duplex timing: configuration bits clocked in on rising SCK edges while conversion results shift out on falling SCK edges. Conversion is initiated by a rising edge on CONV, with tCONV = 3.2μs (max), and automatic power-down occurs when CONV remains high post-conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high dynamic range measurement |
| Max Sampling Rate | 250ksps - supports real-time acquisition of signals up to 125kHz full linear bandwidth |
| Supply Current | 850μA (typ) at 250ksps - enables battery-operated designs with minimal thermal load |
| INL Error | ±6 LSB (max) - ensures monotonicity and ≤0.09% full-scale linearity error across temperature |
| SNR | 87 dB - provides >14-bit effective resolution for clean signal digitization |
| Reference Architecture | VREF tied to VCC - eliminates external reference component count in SO-8 configuration |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded instrumentation environments |
Pinout & Package
Package: 8-lead plastic SO (Small Outline). RoHS-compliant, lead-free finish, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Input | Rising-edge-triggered start signal; high state after conversion enables auto-shutdown mode |
| CH0 | Analog Input Channel 0 | Positive input for single-ended or differential channel selection per MUX configuration |
| CH1 | Analog Input Channel 1 | Positive input for second channel; used with CH0 in differential mode or as alternate single-ended input |
| GND | Analog Ground | Common reference for analog inputs and internal circuitry; must connect directly to analog ground plane |
| VCC | Positive Supply | 5V nominal supply; also serves as internal reference source (VREF = VCC) in SO-8 package |
| SCK | Shift Clock Input | Synchronizes full-duplex serial communication; rising edge clocks in config, falling edge clocks out data |
| SDO | Digital Data Output | 16-bit conversion result shifted out MSB-first on falling SCK edges |
| SDI | Digital Data Input | Accepts 2-bit MUX configuration word (SGL/DIFF, ODD/SIGN) during CONV-low phase |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Enables flexible signal routing (single-ended or differential) without external switches or layout changes |
| Auto shutdown at low sampling rates | Reduces ICC from 850μA to 2μA at 1ksps, extending battery life in portable instruments |
| VREF = VCC internal connection (SO-8) | Eliminates need for external reference IC or resistor divider, simplifying BOM and layout |
| True differential input architecture | Rejects common-mode noise on CH0/CH1 pairs, improving measurement integrity in noisy environments |
| Guaranteed 14-bit no-missing-codes resolution | Ensures monotonic transfer function critical for closed-loop control and precision feedback systems |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitoring units acquiring temperature, pressure, and humidity over extended field deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple sensor outputs via software-configured MUX, synchronized to microcontroller SPI host. Use Value: 250ksps sampling and 2μA sleep current enable multi-day operation on coin-cell batteries while maintaining 16-bit resolution. | Use Scenario: PLC analog input modules conditioning and digitizing 4–20mA or ±10V industrial transducer signals. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with ratiometric capability, referenced to system VCC for immunity to supply drift. Use Value: ±6 LSB INL and 87dB SNR ensure <0.1% total measurement uncertainty across 0°C–70°C operating range. |
| Medical Instrumentation | Isolated Remote Acquisition |
Use Scenario: Portable ECG or patient vital sign monitors requiring low-noise, low-power analog signal capture. IC Role / Device Role / Timing Role: Precision ADC capturing biopotential waveforms with differential input rejecting 50/60Hz mains interference. Use Value: True differential inputs and 125kHz full linear bandwidth preserve diagnostic waveform fidelity without external amplification. | Use Scenario: Distributed sensor nodes in hazardous or electrically noisy locations using opto-isolated or transformer-coupled digital links. IC Role / Device Role / Timing Role: Local ADC converting analog sensor data before isolation barrier, minimizing analog trace length. Use Value: SO-8 package and VREF = VCC simplify isolated supply design by eliminating separate reference voltage generation. |
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 |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100ksps, SPI interface, external reference only, no internal MUX | Lacks software-selectable dual-channel MUX; requires external multiplexer for multi-signal acquisition | Preferred when lower sampling rate suffices and external reference flexibility is required |
| MAX11156ATJ+ | 16-bit, 500ksps, internal reference, 8-channel MUX, 16-pin TQFN | Higher channel count and speed but larger footprint and different pinout; no SO-8 option | Chosen for higher throughput or more channels, accepting trade-off in package size and layout redesign |
Compared with ADS8325IPW and MAX11156ATJ+, the LTC1865ACS8#TRPBF uniquely balances 250ksps performance, SO-8 compactness, and integrated dual-channel MUX-enabling direct replacement of discrete MUX + ADC solutions without PCB revision.
Availability
LTC1865ACS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical data acquisition requiring stable component supply and commercial-temperature-grade reliability.
Supply support for LTC1865ACS8#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 LTC1865ACS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for ultra-low-power, high-resolution sampling in space- and energy-constrained embedded systems.
FAQ
What is the reference voltage configuration for LTC1865ACS8#TRPBF?
The LTC1865ACS8#TRPBF uses an internal connection where VREF is tied to VCC. This means the reference voltage equals the supply voltage (5V nominal), establishing a 0V to VCC input span. No external reference component is required, simplifying design and reducing BOM cost compared to versions supporting adjustable VREF.
Does LTC1865ACS8#TRPBF support differential input modes?
Yes, the LTC1865ACS8#TRPBF supports both single-ended and differential input configurations via its 2-bit software-selectable MUX. In differential mode, it measures the voltage difference between CH0 and CH1 (or CH1 and GND depending on configuration), providing common-mode noise rejection essential for precision measurements in electrically noisy environments.
What is the maximum sampling frequency of LTC1865ACS8#TRPBF and how is it achieved?
The LTC1865ACS8#TRPBF achieves a maximum sampling frequency of 250ksps. This is enabled by a 3.2μs conversion time (tCONV) and optimized internal timing. To sustain this rate, the SCK clock must operate at up to 16.7MHz (H-grade) and the CONV pulse width must meet minimum timing requirements specified in the datasheet's Recommended Operating Conditions table.
How does the auto shutdown feature work in LTC1865ACS8#TRPBF?
The LTC1865ACS8#TRPBF automatically enters low-power shutdown mode when the CONV pin remains high after conversion completion. At 1ksps, this reduces supply current from 850μA to just 2μA. The feature eliminates the need for external power-gating circuitry, making it ideal for duty-cycled or event-triggered acquisition systems where average power must be minimized.
Is LTC1865ACS8#TRPBF pin-compatible with earlier 12-bit versions like LTC1860/LTC1861?
No, the LTC1865ACS8#TRPBF is not pin-compatible with the 12-bit LTC1860/LTC1861. While both are 8-lead SO packages, the LTC1865ACS8#TRPBF repurposes pins for dual-channel MUX functionality (CH0, CH1, SDI) versus the LTC1860's single-ended IN+ and IN−. Layout redesign is required to migrate from LTC1860/LTC1861 to LTC1865ACS8#TRPBF.
LTC1865ACS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865ACS8#TRPBF FAQ
1.How can I place an order for LTC1865ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865ACS8#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 LTC1865ACS8#TRPBF reliable?
The price and inventory of LTC1865ACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865ACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865ACS8#TRPBF transactions.
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4.How is shipping managed for LTC1865ACS8#TRPBF?
LTC1865ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865ACS8#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 LTC1865ACS8#TRPBF?
For technical support, including LTC1865ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865ACS8#TRPBF requirements.
6.How does Aetrix verify that LTC1865ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865ACS8#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 LTC1865ACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865ACS8#TRPBF?
All LTC1865ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865ACS8#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 LTC1865ACS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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