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Analog Devices Inc. LTC1285CS8#TRPBF
- Part No.:
- LTC1285CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1285CS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,825
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Product details
Overview
LTC1285CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit micropower successive approximation ADC with differential analog input, single-supply operation (2.7V–6V), 160µA typical supply current at 7.5ksps, on-chip sample-and-hold, and SPI/Microwire-compatible 3-wire serial interface. It targets ultra-low-power sensor digitization in battery-operated and isolated data acquisition systems.
For engineers reviewing the LTC1285CS8#TRPBF datasheet, LTC1285CS8#TRPBF pinout, LTC1285CS8#TRPBF application, or LTC1285CS8#TRPBF equivalent, key selection criteria include guaranteed ±3/4 LSB DNL, auto-shutdown to 1nA, 100µs conversion time, 2.7V minimum supply, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC1285CS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and rail-to-rail compatible digital I/O. Its differential input supports ratiometric sensing and direct connection to transducers with common-mode voltage up to VCC, enabling high-impedance signal acquisition without external gain stages.
Serial communication uses a synchronous 3-wire interface (CS/SHDN, CLK, DOUT) with MSB-first output format and null-bit preamble. Conversion is initiated by CS falling edge; DOUT becomes active after the second CLK edge, delivering 12-bit unipolar codes aligned to VREF span without configuration overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - delivers 4096 distinct output levels for precision measurement. |
| Supply Current | 160µA typ at 7.5ksps; drops to 1nA typ in shutdown - enables multi-year battery life in intermittent-sampling applications. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonicity and accurate representation of small signal changes across full scale. |
| Conversion Time | 100µs (12 clock cycles @ 120kHz) - supports real-time sampling of signals up to ~10kHz Nyquist bandwidth. |
| Analog Input Range | Differential: 0V to VREF; supports reduced spans down to 1.5V full-scale - allows direct interfacing with low-output sensors. |
| Reference Input | External VREF pin (Pin 1); high-impedance (2.7MΩ typ) - permits flexible reference sourcing (internal/external, buffered/unbuffered). |
| Operating Supply | 2.7V to 6V single supply - eliminates need for dual rails or LDOs in mixed-voltage systems. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150°C max junction temperature, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Defines full-scale range; high-impedance node enabling direct connection to precision references or resistor dividers. |
| +IN (Pin 2) | Positive analog input | Differential input terminal; accepts signals up to VCC + 0.05V, supporting wide common-mode range. |
| –IN (Pin 3) | Negative analog input | Differential input terminal; complements +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; high state powers down entire circuit to 1nA leakage - primary power management signal. |
| DOUT (Pin 6) | Digital data output | 3-state serial output; delivers 12-bit MSB-first code after null bit; Hi-Z when CS high or during conversion setup. |
| CLK (Pin 7) | Serial clock input | Synchronizes data transfer; falling edge clocks data out; supports up to 120kHz (3V) or 200kHz (5V). |
| VCC (Pin 8) | Power supply | Single supply input (2.7V–6V); requires local 10µF tantalum bypass to GND for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 160µA typical active current enables >10-year battery life in 1Hz-sampled IoT nodes. |
| Auto shutdown | Reduces supply current to 1nA typ between conversions - eliminates need for external power gating logic. |
| Differential input architecture | Rejects common-mode noise and supports ratiometric sensor interfaces without external instrumentation amps. |
| On-chip sample-and-hold | Acquires analog input in ≤1.5 clock cycles - simplifies timing design and eliminates external S/H component cost. |
| SPI/Microwire compatibility | 3-wire interface (CS, CLK, DOUT) with standard timing - interoperates with 8051, ARM Cortex-M, and PIC microcontrollers. |
Applications
| Pen Screen Digitizing | Battery Monitoring |
|---|---|
Use Scenario: Digitizing analog voltage from resistive touch screen layers under low-duty-cycle polling. IC Role / Device Role / Timing Role: Differential ADC capturing X/Y coordinate voltages with 12-bit resolution and <100µs latency per sample. Use Value: Enables 3.3V coin-cell-powered stylus detection with <2µA average current draw over 100Hz polling interval. |
Use Scenario: Measuring cell voltage in multi-cell Li-ion packs using precision resistor dividers. IC Role / Device Role / Timing Role: High-impedance unipolar ADC referenced to pack voltage, rejecting supply ripple via differential input mode. Use Value: Achieves ±1.2mV absolute accuracy (±3/4 LSB @ 2.5V ref) without calibration, supporting SOC estimation within 1% error. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Wireless sensor node measuring temperature, pressure, or humidity in industrial field locations. IC Role / Device Role / Timing Role: Low-quiescent ADC interfaced to thermistor or bridge sensor; samples at 1–10Hz with automatic sleep/wake. Use Value: Reduces system standby current to <500nA (including MCU deep sleep), extending AA battery life beyond 5 years. |
Use Scenario: Signal conditioning in medical or industrial isolation barriers where analog signals cross HV boundaries. IC Role / Device Role / Timing Role: ADC placed on isolated side; powered locally and transmitting digitized data via optocoupler or digital isolator. Use Value: Eliminates need for isolated analog front-end components - reduces BOM count and creepage/clearance complexity. |
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 SO, 12-bit, 200ksps, 1.2mA active current, internal reference, single-ended input only | Higher speed but 7.5× higher supply current; lacks differential input and auto-shutdown | Select when sampling rate >10ksps is required and board-level power budget allows >1mA continuous draw. |
| MAX11100ASA+ | 8-pin SO, 12-bit, 100ksps, 350µA active current, internal reference, pseudo-differential input | No true differential mode; requires external reference for best linearity; no 1nA shutdown state | Choose when integrating reference simplifies layout and system-level noise immunity is less critical than raw throughput. |
Compared with ADS7822U and MAX11100ASA+, the LTC1285CS8#TRPBF uniquely combines true differential input, sub-µA shutdown, and 160µA active current - making it the only option for ultra-low-power, noise-sensitive, floating-source measurement in space-constrained SO-8 designs.
Availability
LTC1285CS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply and long-term production continuity.
Supply support for LTC1285CS8#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) is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1285CS8#TRPBF belongs to Linear's legacy micropower precision ADC family, designed specifically for energy-constrained applications demanding high resolution, low noise, and minimal quiescent current without sacrificing ease of use.
FAQ
What is the maximum clock frequency supported by the LTC1285CS8#TRPBF?
The LTC1285CS8#TRPBF supports up to 120kHz clock frequency at 2.7V supply, scaling to 200kHz at 5V. Exceeding the recommended frequency degrades DNL and increases conversion errors due to insufficient settling time in the capacitive DAC array. Always verify timing margins using the tWHCLK (3.5µs min) and tWLCLK (3.5µs min) specifications from the datasheet.
Does the LTC1285CS8#TRPBF require an external reference voltage?
Yes, the LTC1285CS8#TRPBF requires an external reference connected to the VREF pin (Pin 1). It does not include an internal reference. The device supports reference voltages from 1.5V to VCC, enabling flexible scaling for different sensor output ranges while maintaining 12-bit resolution and guaranteed ±3/4 LSB DNL performance.
Can the LTC1285CS8#TRPBF operate from a 2.5V supply?
No - the LTC1285CS8#TRPBF has a minimum supply voltage of 2.7V per Absolute Maximum Ratings and Recommended Operating Conditions. Operation below 2.7V risks non-monotonic behavior, increased DNL, and failure to meet specified 12-bit resolution. For 2.5V systems, consider the pin-compatible LTC1286CS8#TRPBF (5V-optimized variant with 2.7V min spec unchanged).
How does the auto-shutdown feature work on the LTC1285CS8#TRPBF?
The LTC1285CS8#TRPBF automatically enters shutdown mode when CS/SHDN (Pin 5) is driven high, reducing supply current to 1nA typ regardless of CLK activity. During active conversion (CS low), it draws 160µA typ at 7.5ksps, then powers down bias circuits and places VREF in high-impedance state after data transfer - eliminating external power control circuitry.
What is the analog input impedance of the LTC1285CS8#TRPBF?
The LTC1285CS8#TRPBF exhibits 20pF input capacitance on active channels and 5pF on inactive paths, with leakage current ≤±1µA over temperature. Its high-impedance differential input allows direct connection to high-output-impedance sensors (e.g., thermistors, RTDs) without buffer amplifiers - preserving signal integrity and minimizing board area.
LTC1285CS8#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):
- 7.5k
- 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:
- 2.7V ~ 6V
- Voltage - Supply, Digital:
- 2.7V ~ 6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1285CS8#TRPBF FAQ
1.How can I place an order for LTC1285CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1285CS8#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 LTC1285CS8#TRPBF reliable?
The price and inventory of LTC1285CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1285CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1285CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1285CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1285CS8#TRPBF?
LTC1285CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1285CS8#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 LTC1285CS8#TRPBF?
For technical support, including LTC1285CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1285CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1285CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1285CS8#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 LTC1285CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1285CS8#TRPBF?
All LTC1285CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1285CS8#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 LTC1285CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1285CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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