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Analog Devices Inc. LTC1286CN8#PBF
- Part No.:
- LTC1286CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1286CN8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LTC1286CN8#PBF from Analog Devices is a micropower, 12-bit successive approximation ADC with differential analog input, on-chip sample-and-hold, and SPI/Microwire-compatible 3-wire serial interface. It operates from 4.5V to 9V, draws 250µA typical supply current at 12.5 ksps, and auto-shuts down to 1nA when idle-enabling battery-powered remote sensing and isolated data acquisition.
For engineers reviewing the LTC1286CN8#PBF datasheet, LTC1286CN8#PBF pinout, LTC1286CN8#PBF application, or LTC1286CN8#PBF equivalent, key selection criteria include guaranteed ±3/4 LSB DNL, 60µs conversion time, 5V–9V single-supply operation, differential input architecture, and SO-8 package compatibility with legacy DIP footprints.
Technical Context
The LTC1286CN8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and rail-to-rail reference input (VREF). Its differential input stage supports ratiometric measurement and direct sensor interfacing down to 1.5V full-scale spans, enabling high-impedance transducer connections without gain stages.
Serial communication uses a synchronous 3-wire protocol (CS/SHDN, CLK, DOUT) with MSB-first output, no DIN required. Conversion is initiated by CS falling edge; DOUT enables after two clock cycles, delivering 12-bit data plus one null bit-fully compatible with 8051 and other microcontrollers lacking dedicated SPI hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes-guarantees monotonic transfer function for precision control loops. |
| Differential Nonlinearity | ±3/4 LSB max-ensures accurate linearity for calibration-critical instrumentation. |
| Supply Current (Active) | 250 µA typ. at 12.5 ksps-enables multi-year battery life in low-duty-cycle monitoring systems. |
| Supply Current (Shutdown) | 1 nA typ.-eliminates quiescent drain in always-on sensor nodes during sleep intervals. |
| Conversion Time | 60 µs-supports real-time sampling of 12.5 kHz signals with deterministic latency. |
| Analog Input Type | Differential (IN+, IN−)-rejects common-mode noise in industrial environments and floating sensor bridges. |
| Reference Input Range | 1.5 V to VCC + 0.05 V-allows flexible scaling from 1.5V sensors up to 9V supplies without external buffers. |
Pinout & Package
Package: 8-lead plastic SOIC (N8), 3.9 mm × 4.9 mm, JEDEC MS-012AC, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale range; accepts external reference or connects directly to VCC for internal ratiometric operation. |
| +IN (Pin 2) | Positive Analog Input | Differential input terminal; high-impedance (>5 MΩ) node suitable for direct thermocouple or bridge connection. |
| –IN (Pin 3) | Negative Analog Input | Differential input terminal; matched to +IN for CMRR >70 dB at DC–1 kHz. |
| GND (Pin 4) | Analog Ground | Must connect directly to analog ground plane-separate from digital ground to minimize noise coupling. |
| CS/SHDN (Pin 5) | Chip Select / Shutdown Control | Active-low enable; logic high forces full shutdown (1 nA), eliminating need for external power gating. |
| DOUT (Pin 6) | Digital Data Output | 3-state serial output; tri-states when CS high-enables bus sharing in multi-device systems. |
| CLK (Pin 7) | Serial Clock Input | Synchronizes data transfer; falling edge clocks out data, rising edge captures DIN (not used on LTC1286). |
| VCC (Pin 8) | Power Supply | 4.5 V to 9 V single supply; requires local 4.7 µF bypass capacitor to GND for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower active mode | 250 µA at 12.5 ksps-reduces thermal drift and extends battery life in portable medical and environmental monitors. |
| Auto-shutdown between conversions | 1 nA typical shutdown current-enables ultra-low-power wake-up architectures with sub-µW average consumption. |
| Differential input architecture | Supports true floating measurements and common-mode rejection-critical for strain gauge and current-sense applications. |
| On-chip sample-and-hold | Acquires signal in ≤1.5 clock cycles-eliminates external S/H circuitry and reduces BOM count in space-constrained designs. |
| 3-wire SPI/Microwire interface | No DIN required-simplifies MCU GPIO usage and enables direct connection to 8051, PIC, and ARM Cortex-M0+ without level shifters. |
Applications
| Battery-Operated Remote Sensors | Isolated Industrial Data Acquisition |
|---|---|
Use Scenario: Wireless temperature/humidity node powered by CR2032 coin cell, transmitting readings every 10 seconds. IC Role / Device Role / Timing Role: ADC digitizes analog sensor outputs; differential inputs reject EMI from nearby motors; auto-shutdown minimizes idle current. Use Value: Achieves >5-year battery life at 12-bit resolution-no external power management IC needed due to 1 nA shutdown current. |
Use Scenario: High-voltage motor controller monitoring phase currents across 1 kV isolation barrier using optocoupled serial link. IC Role / Device Role / Timing Role: ADC samples isolated shunt voltage; differential input rejects common-mode transients; 3-wire interface simplifies isolated clock/data routing. Use Value: Eliminates separate S/H and level-shifting components-reducing isolation component count and PCB area by 30%. |
| Handheld Diagnostic Equipment | Low-Power Battery Monitoring |
Use Scenario: Portable multimeter with dual-range voltage measurement (±200 mV and ±20 V) using programmable gain amplifier front-end. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog signals; VREF pin accepts variable reference to scale full-scale range; 12-bit resolution supports 0.05% accuracy. Use Value: Enables dual-range design with single ADC-reducing cost vs. dual-ADC solutions while maintaining traceable metrology-grade linearity. |
Use Scenario: Smart battery pack with fuel gauge monitoring cell voltage, temperature, and charge/discharge current in IoT asset trackers. IC Role / Device Role / Timing Role: ADC measures cell voltage differentially against pack ground; low supply current extends runtime during periodic health checks. Use Value: Delivers 12-bit cell voltage accuracy with <1 µA average system current-preserving >99% of battery capacity during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit micropower ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, 12-bit, 200 ksps, 1.8–5.25 V supply, no auto-shutdown (250 µA continuous) | Higher speed but lacks 1 nA shutdown-unsuitable for ultra-low-duty-cycle battery systems | Select LTC1286CN8#PBF when sub-µA average current is mandatory; choose ADS7822U only if >100 ksps sampling is required. |
| MAX1241ACPP+ | 8-pin DIP/SO, 12-bit, 75 ksps, 2.7–5.25 V, SPI-compatible, 1.5 µA shutdown | 1.5 µA shutdown vs. 1 nA-1500× higher leakage limits deep-sleep battery life | LTC1286CN8#PBF is preferred for >1-year coin-cell operation; MAX1241 suits applications where 1.5 µA shutdown is acceptable. |
Compared with ADS7822U and MAX1241ACPP+, the LTC1286CN8#PBF uniquely delivers 12-bit accuracy with nanoscale shutdown current-enabling decade-long deployments in energy-harvesting and maintenance-free sensor networks where every nanoamp matters.
Availability
LTC1286CN8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated industrial monitoring requiring stable component supply and long-term lifecycle support.
Supply support for LTC1286CN8#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1286CN8#PBF belongs to the LTC® micropower precision ADC family, designed specifically for ultra-low-power, high-accuracy data acquisition in resource-constrained embedded systems where energy efficiency and measurement integrity are co-primary requirements.
FAQ
What is the maximum clock frequency supported by the LTC1286CN8#PBF?
The LTC1286CN8#PBF supports a maximum clock frequency of 200 kHz when operating from a 5 V supply. At higher supply voltages (up to 9 V), the maximum clock frequency increases slightly-reaching ~290 kHz at 9 V-as confirmed in the Typical Performance Characteristics (Figure G13). Exceeding these limits risks conversion errors due to insufficient internal settling time.
Does the LTC1286CN8#PBF require an external reference voltage?
No-the LTC1286CN8#PBF can operate with either an external reference applied to the VREF pin or with VREF tied directly to VCC for ratiometric measurement. When VREF = VCC, the full-scale range equals the supply voltage, enabling direct sensor interfacing without external references-ideal for bridge-based transducers and resistive sensors.
Can the LTC1286CN8#PBF interface directly with a 3.3 V microcontroller?
Yes-with caution. The LTC1286CN8#PBF's DOUT output swings from 0 V to VCC (up to 9 V), so direct connection to a 3.3 V MCU input risks damage. Use a resistor divider (e.g., 10 kΩ + 20 kΩ) on DOUT to scale to 3.3 V logic levels. CS and CLK inputs are TTL-compatible at 5 V and tolerate 3.3 V signals when VCC ≥ 4.5 V, per the VIH/VIL specs.
What is the analog input impedance of the LTC1286CN8#PBF?
The LTC1286CN8#PBF exhibits >5 MΩ input impedance on both +IN and –IN pins under static conditions, as specified in the Reference Input Resistance (RREF) parameter. During sampling, the switched-capacitor input presents dynamic loading-requiring source impedances <1 kΩ for full 12-bit accuracy, per Figure G16 acquisition time vs. source resistance.
How does the auto-shutdown feature of the LTC1286CN8#PBF work?
The LTC1286CN8#PBF automatically enters shutdown mode whenever the CS/SHDN pin is held high (≥VCC), reducing supply current to 1 nA typical. No software command or configuration is needed-shutdown is purely hardware-controlled. Conversion resumes immediately upon CS falling edge, with no wake-up delay or initialization sequence required.
LTC1286CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 12.5k
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- 4.5V ~ 9V
- Voltage - Supply, Digital:
- 4.5V ~ 9V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1286CN8#PBF FAQ
1.How can I place an order for LTC1286CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1286CN8#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 LTC1286CN8#PBF reliable?
The price and inventory of LTC1286CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1286CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1286CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1286CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1286CN8#PBF?
LTC1286CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1286CN8#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 LTC1286CN8#PBF?
For technical support, including LTC1286CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1286CN8#PBF requirements.
6.How does Aetrix verify that LTC1286CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1286CN8#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 LTC1286CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1286CN8#PBF?
All LTC1286CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1286CN8#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 LTC1286CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1286CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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