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Analog Devices Inc. LTC1861CS8#TRPBF
- Part No.:
- LTC1861CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1861CS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,392
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Product details
Overview
LTC1861CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 250ksps, 2-channel serial ADC in an 8-lead SOIC package, operating from a single 5V supply with 850µA typical supply current and software-selectable multiplexer control. It features true differential input capability per channel, SPI/MICROWIRE-compatible 3-wire serial interface, and internal VREF tied to VCC for fixed full-scale range.
For engineers reviewing the LTC1861CS8#TRPBF datasheet, LTC1861CS8#TRPBF pinout, LTC1861CS8#TRPBF application, or LTC1861CS8#TRPBF equivalent, this device supports low-power portable instrumentation, isolated data acquisition, and compact embedded systems requiring precise dual-channel sampling without external reference circuitry.
Technical Context
The LTC1861CS8#TRPBF implements a switched-capacitor successive approximation architecture with integrated sample-and-hold and a 2-bit configuration word shifted in via SDI to select between four analog input combinations (single-ended CH0/GND, CH1/GND, or differential CH0–CH1, CH1–CH0). Its SO-8 variant fixes VREF = VCC, eliminating external reference components but limiting full-scale span to 4.75V–5.25V.
Conversion timing is deterministic: tCONV ≤ 3.3µs at 250ksps, with auto-shutdown reducing supply current to 1nA between conversions. Digital I/O complies with 5V logic thresholds (VIH ≥ 2.4V, VIL ≤ 0.8V), and SDO output drive supports 360µA sink at 2.4V VOH, enabling direct interfacing with microcontrollers and FPGAs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Max Sampling Rate | 250ksps - supports bandwidth-limited signals up to 125kHz full linear bandwidth |
| Supply Current | 850µA typical at 250ksps - enables battery operation in portable instruments for >100 hours on a 100mAh cell |
| INL Error | ±2 LSB max - ensures monotonicity and <0.05% end-point linearity error across full scale |
| SNR | 72dB - resolves signals with 12-bit effective resolution under clean 100kHz input conditions |
| Reference Configuration | VREF internally tied to VCC - eliminates external reference IC and associated layout complexity |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012AC, body size 4.90mm × 3.91mm, lead pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONV | Convert Start Input | Active-high edge-triggered command initiating conversion; low level enables SDO output during serial readout |
| 2 CH0 | Analog Input Channel 0 | Positive input terminal for single-ended or differential mode; referenced to GND in SO-8 package |
| 3 CH1 | Analog Input Channel 1 | Positive input terminal for second channel; used as negative input when configured for differential CH0–CH1 |
| 4 GND | Analog Ground | Single-point return path for analog circuitry; must connect directly to low-impedance analog ground plane |
| 5 SDI | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges prior to conversion start |
| 6 SDO | Serial Data Output | Transmits 12-bit result LSB-first on falling SCK edges; tri-stated when CONV is high |
| 7 SCK | Serial Clock Input | Synchronizes bidirectional data transfer; supports up to 16.7MHz clock for fast readout |
| 8 VCC | Positive Supply | 5V ±5% power rail; also serves as internal reference voltage source (VREF = VCC) |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software-Selectable MUX | Enables flexible signal routing (CH0/GND, CH1/GND, CH0–CH1, CH1–CH0) without external switches or PCB rework |
| Auto Shutdown Between Conversions | Reduces quiescent current to 1nA, cutting average power by >99% in burst-sampling applications |
| Internal VREF = VCC | Removes need for external reference IC, saving BOM cost and board space in cost-sensitive designs |
| True Differential Input Architecture | Rejects common-mode noise up to 125kHz bandwidth, improving measurement integrity in noisy environments |
| Guaranteed Operation to 70°C | Validates performance in enclosed enclosures or ambient-temperature-limited industrial settings |
Applications
| Portable Multimeter Front-End | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Dual-channel voltage measurement in handheld test equipment with battery-powered operation and space constraints. IC Role / Device Role / Timing Role: Primary ADC digitizing two independent sensor outputs (e.g., voltage and current) with simultaneous sampling enabled via MUX configuration. Use Value: 250ksps rate captures transient events; 850µA supply current extends battery life; SO-8 footprint minimizes PCB area. |
Use Scenario: Isolated analog input stage in programmable logic controller rack modules requiring ratiometric accuracy. IC Role / Device Role / Timing Role: High-speed sampling front-end converting field sensor signals (4–20mA loop outputs) into digital values for real-time control algorithms. Use Value: Internal VREF = VCC eliminates reference drift errors; differential inputs reject 50/60Hz noise from long sensor cables. |
| Remote Sensor Node in Wireless Mesh Network | Compact Medical Vital Sign Monitor |
Use Scenario: Low-power environmental monitoring node (temperature, humidity) transmitting data over sub-GHz RF link. IC Role / Device Role / Timing Role: Energy-efficient ADC acquiring sensor data in burst mode, synchronized with RF transmission intervals. Use Value: 1nA shutdown current minimizes idle power; SPI interface reduces MCU GPIO count; SO-8 simplifies automated assembly. |
Use Scenario: Portable ECG or pulse oximetry device requiring accurate dual-channel biopotential acquisition. IC Role / Device Role / Timing Role: Precision digitizer for differential electrode pairs (e.g., RA–LA, LL–RA) with configurable gain paths. Use Value: True differential inputs suppress common-mode interference from AC mains; 72dB SNR preserves diagnostic signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel, serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1861IMS8#TRPBF | 10-lead MSOP package with externally adjustable VREF (1V–5.25V), –40°C to 85°C temp range | Supports wider input spans and extended temperature operation; requires external reference decoupling | Select when variable full-scale range or industrial temperature grade is required |
| LTC1865CMS#TRPBF | 16-bit resolution, same 250ksps rate, 10-lead MSOP, external VREF, higher SNR (89dB) | Delivers 4× finer quantization but doubles power (1.3mA) and increases cost and layout complexity | Select when 16-bit precision outweighs power and cost trade-offs in high-end instrumentation |
Compared with LTC1861IMS8#TRPBF, the LTC1861CS8#TRPBF trades external reference flexibility and extended temperature range for lower cost and simpler layout; versus LTC1865CMS#TRPBF, it prioritizes power efficiency and BOM simplicity over resolution-making it optimal for commercial-grade dual-channel sensing where 12-bit fidelity suffices.
Availability
LTC1861CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog input modules, and remote wireless sensor nodes requiring stable component supply, tape-and-reel delivery, and long-term production continuity.
Supply support for LTC1861CS8#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 acquired Linear Technology in 2017 and maintains its precision analog product lines, including high-performance data converters, with global manufacturing and quality certifications.
The LTC1861CS8#TRPBF belongs to Linear's µPower Serial ADC family, designed specifically for space-constrained, battery-operated, and cost-sensitive embedded systems needing reliable dual-channel sampling without external reference components.
FAQ
What is the maximum sampling frequency of the LTC1861CS8#TRPBF?
The LTC1861CS8#TRPBF achieves a maximum sampling frequency of 250ksps, with guaranteed conversion time ≤3.3µs across the 0°C to 70°C operating range. This allows full-bandwidth digitization of signals up to 125kHz while maintaining 72dB SNR and ±2 LSB INL accuracy.
Does the LTC1861CS8#TRPBF require an external voltage reference?
No, the LTC1861CS8#TRPBF does not require an external voltage reference. Its SO-8 package internally ties VREF to VCC, establishing a fixed full-scale range equal to the supply voltage (4.75V–5.25V), simplifying design and reducing component count.
How many analog input channels does the LTC1861CS8#TRPBF support?
The LTC1861CS8#TRPBF supports two analog input channels (CH0 and CH1), selectable via a 2-bit configuration word shifted into SDI. It enables four input modes: single-ended CH0/GND, CH1/GND, or differential CH0–CH1 and CH1–CH0.
What is the supply current consumption of the LTC1861CS8#TRPBF at 250ksps?
At 250ksps, the LTC1861CS8#TRPBF draws 850µA typical supply current from a 5V rail. Between conversions, it automatically enters shutdown mode drawing only 1nA, making it ideal for burst-sampling and battery-powered applications.
Is the LTC1861CS8#TRPBF pin-compatible with other members of the LTC1860/LTC1861 family?
The LTC1861CS8#TRPBF shares the same 8-pin SOIC pinout as the LTC1860CS8#TRPBF but differs functionally: LTC1860 has differential IN+/IN– inputs, while LTC1861CS8#TRPBF uses CH0/CH1 with SDI for MUX control. Pin compatibility exists only within same-function variants-not across LTC1860/LTC1861 families.
LTC1861CS8#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:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- 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:
- -
LTC1861CS8#TRPBF FAQ
1.How can I place an order for LTC1861CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861CS8#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 LTC1861CS8#TRPBF reliable?
The price and inventory of LTC1861CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861CS8#TRPBF transactions.
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4.How is shipping managed for LTC1861CS8#TRPBF?
LTC1861CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861CS8#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 LTC1861CS8#TRPBF?
For technical support, including LTC1861CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1861CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861CS8#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 LTC1861CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861CS8#TRPBF?
All LTC1861CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861CS8#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 LTC1861CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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