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Analog Devices Inc. LTC1286IN8#PBF
- Part No.:
- LTC1286IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1286IN8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,518
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Product details
Overview
LTC1286IN8#PBF from Analog Devices (formerly Linear Technology) 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. It is used in battery-powered remote data acquisition systems requiring high-resolution ratiometric sensing.
For engineers reviewing the LTC1286IN8#PBF datasheet, LTC1286IN8#PBF pinout, LTC1286IN8#PBF application, or LTC1286IN8#PBF equivalent, key selection criteria include guaranteed ±3/4 LSB DNL, 60µs conversion time, single-supply operation up to 9V, differential input architecture, and I/O compatibility with 8051-family microcontrollers via CS/CLK/DOUT signals.
Technical Context
The LTC1286IN8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise measurement of floating differential signals without external amplification. Its reference input (VREF) is independent of VCC, supporting ratiometric configurations and reduced full-scale spans down to 1.5V.
It uses a synchronous 3-wire serial interface where data is shifted out MSB-first on DOUT synchronized to CLK falling edges, initiated by a low-going CS pulse. No configuration word is required-conversion starts automatically upon CS assertion, and the device powers down between transfers without external control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - delivers 4096 distinct output levels for high-precision sensor digitization. |
| Sampling Rate | 12.5 ksps maximum - supports real-time monitoring of fast-changing analog signals like temperature transients or battery voltage ripple. |
| Supply Current | 250 µA typ. during conversion; drops to 1 nA typ. in shutdown - enables multi-year operation on coin-cell batteries. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonicity and accurate linearity-critical applications such as precision instrumentation. |
| Conversion Time | 60 µs at 200 kHz clock - defines minimum inter-conversion interval and supports tight timing budgets in embedded firmware. |
| Analog Input Range | Differential ±VREF/2 - allows direct connection to bridge sensors or isolated signal sources without level-shifting circuitry. |
| Reference Input | High-impedance (5 MΩ min) - permits use of external precision references or ratiometric sourcing from same supply as sensor. |
Pinout & Package
Package: 8-lead plastic DIP (N8), 0.3-inch width, through-hole mount. RoHS-compliant, lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; accepts 1.5V–VCC range; high-impedance node enabling direct connection to external references or ratiometric sensor supplies. |
| +IN (Pin 2) | Positive Analog Input | Differential input terminal; measures voltage relative to –IN; supports common-mode voltages up to VCC. |
| –IN (Pin 3) | Negative Analog Input | Differential input terminal; forms matched pair with +IN for noise-rejecting measurements of floating sources. |
| GND (Pin 4) | Analog Ground | Must connect directly to analog ground plane; separates analog return path from digital noise sources. |
| CS/SHDN (Pin 5) | Chip Select / Shutdown Control | Active-low enable; logic high forces full shutdown (1 nA); no external power-down sequencing required. |
| DOUT (Pin 6) | Digital Data Output | Serial MSB-first output; tri-stated when CS is high; compatible with 3.3V/5V logic inputs when VCC ≤ 5.5V. |
| CLK (Pin 7) | Serial Clock Input | Synchronizes data transfer; rising edge samples DIN (not used on LTC1286); falling edge clocks DOUT data. |
| VCC (Pin 8) | Power Supply | Single supply input (4.5V–9V); requires local 4.7µF bypass capacitor to GND for stable reference and sampling performance. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 250 µA active current enables >10-year battery life in 1-sampling-per-second remote sensor nodes. |
| Auto shutdown | 1 nA typical shutdown current eliminates need for external power-gating circuitry or firmware sleep management. |
| Differential input architecture | Rejects common-mode noise in industrial environments; supports direct interface to strain gauges and RTDs without instrumentation amps. |
| On-chip sample-and-hold | Eliminates external S/H IC and associated layout complexity; maintains accuracy over full temperature range (–40°C to +85°C). |
| 3-wire SPI/Microwire interface | Reduces MCU GPIO count and PCB routing density; compatible with legacy 8051, PIC, and ARM Cortex-M0 peripherals. |
Applications
| Battery Monitoring | Remote Temperature Sensing |
|---|---|
|
Use Scenario: Measuring cell voltage and pack imbalance in lithium-ion battery packs deployed in asset trackers or wireless IoT nodes. IC Role / Device Role / Timing Role: ADC digitizes differential voltage across sense resistors or individual cells; performs 12-bit conversions every 100 ms with automatic power cycling between reads. Use Value: 250 µA active current and 1 nA shutdown extend CR2032 battery life beyond 5 years in low-duty-cycle deployments. |
Use Scenario: Digitizing output of thermistor or RTD bridges in unattended environmental monitoring stations powered by solar-charged batteries. IC Role / Device Role / Timing Role: Differential input rejects EMI from long sensor leads; internal S/H captures stable readings despite supply ripple from intermittent charging circuits. Use Value: ±3/4 LSB DNL and ratiometric capability ensure <±0.1°C accuracy without calibration drift over temperature. |
| Isolated Data Acquisition | Handheld Terminal Interface |
|
Use Scenario: Signal conditioning front-end for optically or magnetically isolated analog channels in medical or industrial safety-critical equipment. IC Role / Device Role / Timing Role: Converts isolated sensor outputs before transmission across barrier; low power minimizes heat generation in compact isolation modules. Use Value: 60 µs conversion time enables high channel density per isolation boundary; 3-wire interface reduces transformer winding count. |
Use Scenario: Analog input subsystem in portable barcode scanners or handheld test meters requiring ultra-low standby power and rugged operation. IC Role / Device Role / Timing Role: Interfaces directly to potentiometers, pressure sensors, or analog switches; survives repeated drop shocks due to monolithic SOIC/DIP construction. Use Value: Single 5V–9V supply simplifies power design; differential input tolerates ground bounce in noisy handheld environments. |
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 | 12-bit, 200 ksps, 2.7V–5.25V supply, SPI 3-wire, no internal S/H, 1.2 mW typical power at full rate | Higher speed but higher power; requires external S/H for AC-coupled signals; not rated for –40°C to +85°C industrial temp range | Select when sampling rate >12.5 ksps is required and system can support 5V-only supply and external hold capacitor. |
| MAX11131AUT+T | 12-bit, 100 ksps, 2.7V–3.6V supply, SPI 4-wire, internal S/H, 1.5 µA shutdown, 125 µA active at 10 ksps | Lower voltage operation only; no differential input; requires DIN for configuration; optimized for 3V battery systems | Select for 3V coin-cell designs where differential input is unnecessary and space-constrained TDFN packaging is preferred. |
Compared with ADS7822U and MAX11131AUT+T, the LTC1286IN8#PBF uniquely combines wide 4.5V–9V supply tolerance, true differential input, guaranteed ±3/4 LSB DNL, and sub-µA shutdown-making it optimal for industrial-grade, battery-operated, floating-signal measurement where precision and longevity are prioritized over raw speed.
Availability
LTC1286IN8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1286IN8#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. (including former Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and power management.
The LTC1286IN8#PBF belongs to Linear Technology's legacy micropower precision ADC family, designed specifically for ultra-low-power, high-accuracy data acquisition in resource-constrained embedded systems where battery life and measurement integrity are critical.
FAQ
What is the operating temperature range of the LTC1286IN8#PBF?
The LTC1286IN8#PBF is specified for operation from –40°C to +85°C (Industrial grade). This range is confirmed in the Absolute Maximum Ratings table and supported by all dynamic and DC specifications across temperature in the datasheet. The part marking "I" in LTC1286IN8 denotes the Industrial temperature grade, distinct from the Commercial-grade "C" variant.
Does the LTC1286IN8#PBF require an external reference voltage?
Yes, the LTC1286IN8#PBF requires an external reference voltage applied to the VREF pin (Pin 1). It does not have an internal reference. The reference can be derived from a precision voltage source, a resistor divider from VCC, or a ratiometric sensor supply-enabling flexible system-level accuracy trade-offs without added components.
Can the LTC1286IN8#PBF operate from a 3.3V supply?
No, the LTC1286IN8#PBF has a minimum supply voltage of 4.5V per the Recommended Operating Conditions table. For 3.3V operation, Analog Devices offers the pin-compatible LTC1285IN8#PBF-a functionally identical 12-bit micropower ADC with 3V supply support and matching pinout/package.
How does the auto-shutdown feature of the LTC1286IN8#PBF work?
The LTC1286IN8#PBF automatically enters ultra-low-power shutdown (1 nA typical) whenever the CS/SHDN pin (Pin 5) is held high. No software command or external timer is needed-the internal bias and comparator circuits power down completely, and the VREF input becomes high-impedance. Power resumes within one clock cycle when CS goes low.
Is the LTC1286IN8#PBF pin-compatible with the LTC1298IN8#PBF?
No, the LTC1286IN8#PBF and LTC1298IN8#PBF have different pin functions and incompatible pinouts. The LTC1286IN8#PBF uses Pins 2 and 3 for +IN/–IN and Pin 1 for VREF, while the LTC1298IN8#PBF uses Pins 2 and 3 for CH0/CH1 and Pin 8 for VCC/VREF. PCB layout must be redesigned for substitution.
LTC1286IN8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1286IN8#PBF FAQ
1.How can I place an order for LTC1286IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1286IN8#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 LTC1286IN8#PBF reliable?
The price and inventory of LTC1286IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1286IN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1286IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1286IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1286IN8#PBF?
LTC1286IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1286IN8#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 LTC1286IN8#PBF?
For technical support, including LTC1286IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1286IN8#PBF requirements.
6.How does Aetrix verify that LTC1286IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1286IN8#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 LTC1286IN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1286IN8#PBF?
All LTC1286IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1286IN8#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 LTC1286IN8#PBF part is unused and in its original packaging.
Return procedure for LTC1286IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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