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Analog Devices Inc. LTC1860IS8#PBF
- Part No.:
- LTC1860IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1860IS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
LTC1860IS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, single-channel, successive-approximation analog-to-digital converter (SAR ADC) in an 8-lead SOIC package, operating on a single 5V supply with 250ksps sampling rate and 850µA typical supply current at full speed. It features true differential analog inputs (IN+, IN–), adjustable external reference input (VREF), and auto-shutdown to 1nA between conversions-enabling high-precision data acquisition in battery-powered portable instrumentation.
For engineers reviewing the LTC1860IS8#PBF datasheet, LTC1860IS8#PBF pinout, LTC1860IS8#PBF application, or LTC1860IS8#PBF equivalent, key selection criteria include its guaranteed –40°C to +85°C industrial temperature range, SO-8 package compatibility, SPI/MICROWIRE™-compatible 3-wire serial interface, differential input architecture, and ratiometric operation capability with external references down to 1V full-scale.
Technical Context
The LTC1860IS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar differential input measurement where output code = (IN+ − IN−) / VREF × 4096. Its conversion cycle is initiated by a rising edge on CONV, completes in ≤3.3µs (H-grade), and enters ultra-low-power sleep mode when CONV remains high post-conversion.
It uses a 3-wire serial interface (SCK, SDO, CONV) with data shifted out on SDO falling edges synchronized to SCK; the host captures data on SCK rising edges. The SO-8 variant ties VREF internally to VCC, fixing full-scale span to VCC, unlike the MSOP version which accepts external VREF from 1V to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-resolution signal digitization |
| Sampling Rate | 250ksps - supports real-time capture of signals up to ~125kHz full-linear bandwidth |
| Supply Current | 850µA (typ) at 250ksps; drops to 1nA in auto-shutdown - enables multi-year battery life in low-duty-cycle systems |
| INL Error | ±1 LSB - ensures monotonicity and <0.025% end-point linearity error across full scale |
| SNR | 72 dB - provides >11.9 effective number of bits (ENOB) for clean signal representation |
| Input Range | Differential 0V to VREF (VCC = 5V) - allows direct connection to sensor bridges or op-amp outputs without gain stages |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012AC, body size 4.90mm × 3.90mm, lead pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Tied internally to VCC in SO-8 package; defines full-scale voltage span (5V) - no external reference required for ratiometric designs |
| IN+ (Pin 2) | Analog Input (+) | Differential positive input; high-impedance (>1GΩ), accepts 0V to VCC - enables direct sensor interfacing |
| IN– (Pin 3) | Analog Input (–) | Differential negative input; sampled simultaneously with IN+ to reject common-mode noise |
| GND (Pin 4) | Analog Ground | Single ground reference for analog section; must connect directly to low-impedance analog plane |
| CONV (Pin 5) | Convert Control | Rising edge initiates conversion; low level enables SDO output; high level after conversion triggers auto-shutdown |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI-compatible output; 12-bit result shifted LSB-first on falling SCK edges |
| SCK (Pin 7) | Serial Clock Input | Master-controlled clock (up to 16.7MHz); synchronizes data transfer and defines timing margins |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; requires local 1µF tantalum bypass to GND for stable conversion accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown mode | Reduces supply current to 1nA between conversions - eliminates need for external power gating in duty-cycled systems |
| True differential input | Rejects common-mode noise on IN+/IN– pair - improves immunity in noisy industrial sensor environments |
| SO-8 pinout compatibility | Shares footprint with legacy 12-bit ADCs (e.g., LTC1286) and 16-bit upgrades (LTC1864) - enables drop-in performance scaling |
| 1V to 5V input span support | Operates with reduced full-scale spans (down to 1V) - accommodates low-output sensors without external amplification |
| Guaranteed operation to 85°C | Validated across full industrial temperature range - avoids thermal derating in enclosed enclosures or hot ambient locations |
Applications
| Portable Data Loggers | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, pressure, and humidity over weeks using intermittent sampling. IC Role / Device Role / Timing Role: Primary SAR ADC acquiring differential bridge sensor outputs at 1–10ksps, entering 1nA sleep between samples. Use Value: 850µA active current and 1nA shutdown enable >5-year CR2032 battery life at 1-sample-per-second duty cycle. | Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20mA transmitters and RTD bridges in factory automation. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with differential inputs rejecting 50/60Hz noise from shared ground planes. Use Value: ±1 LSB INL and 72dB SNR ensure <0.02% total measurement uncertainty across 0–100°C operating range. |
| Isolated Remote Monitoring Nodes | Low-Power Medical Instrumentation |
Use Scenario: Wireless sensor node mounted on rotating machinery, transmitting vibration spectra via RF link after local FFT processing. IC Role / Device Role / Timing Role: High-speed ADC capturing accelerometer waveforms at 250ksps for time-domain analysis prior to spectral compression. Use Value: 250ksps sampling and 125kHz full-linear bandwidth preserve mechanical resonance signatures up to 10kHz. | Use Scenario: Handheld ECG device acquiring biopotential signals with ultra-low power budget and strict EMC requirements. IC Role / Device Role / Timing Role: Low-noise, low-power ADC digitizing amplified electrode signals while minimizing patient leakage current. Use Value: High-impedance inputs and internal VREF eliminate external reference ICs - reducing BOM count and PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1864CS8#PBF | 16-bit resolution, same SO-8 package, 250ksps, 4.25mW power, internal reference option | Higher precision required; external reference not needed; tighter DC specs (±0.5 LSB INL) | Select when ENOB >12 bits is mandatory and system can accommodate higher power (5×) and cost premium |
| ADS7822U | TI 12-bit, 200ksps, SO-8, 3.3V-only supply, SPI interface, no auto-shutdown (1.2mA active) | 3.3V system integration; lower max sampling rate; no deep-sleep mode | Select for 3.3V microcontroller interfaces where 250ksps is not required and continuous sampling is used |
Compared with LTC1864CS8#PBF, the LTC1860IS8#PBF trades resolution and DC accuracy for 5× lower power and simpler 5V-only supply design; versus ADS7822U, it offers higher speed, wider temperature range, and critical nanoamp shutdown-making it superior for intermittent, battery-operated, industrial-grade acquisition.
Availability
LTC1860IS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and isolated remote monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1860IS8#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for the LTC portfolio. Linear was founded in 1981 and specialized in high-performance analog ICs.
The LTC1860 belongs to Linear's precision data acquisition product line, designed specifically for low-power, high-speed, industrial-grade SAR ADC applications where accuracy, temperature stability, and supply efficiency are co-optimized.
FAQ
What is the maximum sampling frequency of the LTC1860IS8#PBF?
The LTC1860IS8#PBF achieves a maximum sampling frequency of 250ksps under specified conditions (VCC = 5V, TA = 25°C). At the industrial temperature grade (–40°C to +85°C), the guaranteed maximum remains 250ksps per the datasheet's fSMPL(MAX) specification. This enables accurate digitization of signals with fundamental content up to 125kHz while maintaining full-linearity performance.
Does the LTC1860IS8#PBF require an external reference voltage?
No, the LTC1860IS8#PBF does not require an external reference voltage. In the SO-8 package variant, VREF is tied internally to VCC, fixing the full-scale range to the supply voltage (4.75V to 5.25V). This simplifies design for ratiometric applications where sensor excitation and ADC reference share the same supply rail-eliminating external reference components and associated noise paths.
How does the auto-shutdown feature work on the LTC1860IS8#PBF?
The LTC1860IS8#PBF automatically enters ultra-low-power shutdown mode when the CONV pin remains high after conversion completion. In this state, supply current drops to a typical 1nA, reducing power consumption by >99.9% compared to active operation. Shutdown is exited on the next rising edge of CONV. This behavior is intrinsic to the part and requires no configuration-ideal for burst-mode acquisition in energy-constrained systems.
What are the absolute maximum ratings for the LTC1860IS8#PBF supply voltage?
The absolute maximum supply voltage (VCC) rating for the LTC1860IS8#PBF is 7V. Operation beyond this voltage risks permanent damage. The recommended operating range is strictly 4.75V to 5.25V for specified performance. Exceeding 7V-even momentarily-may compromise latch-up immunity and long-term reliability, so proper input filtering and regulator tolerance margins must be observed in system design.
Is the LTC1860IS8#PBF pin-compatible with other ADCs in the same family?
Yes, the LTC1860IS8#PBF is pin-compatible with the LTC1864CS8#PBF (16-bit) and legacy LTC1286CS8#PBF (12-bit) in the SO-8 package. All three share identical pin functions and physical layout (VREF/IN+/IN–/GND/CONV/SDO/SCK/VCC), enabling hardware reuse and upgrade paths. However, register mapping and timing parameters differ-firmware must be adapted for resolution and interface protocol changes.
LTC1860IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1860IS8#PBF FAQ
1.How can I place an order for LTC1860IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1860IS8#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 LTC1860IS8#PBF reliable?
The price and inventory of LTC1860IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1860IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1860IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1860IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1860IS8#PBF?
LTC1860IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1860IS8#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 LTC1860IS8#PBF?
For technical support, including LTC1860IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1860IS8#PBF requirements.
6.How does Aetrix verify that LTC1860IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1860IS8#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 LTC1860IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1860IS8#PBF?
All LTC1860IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1860IS8#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 LTC1860IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1860IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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