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Analog Devices Inc. LTC1288IS8#PBF
- Part No.:
- LTC1288IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1288IS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
LTC1288IS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, micropower, successive-approximation analog-to-digital converter with integrated sample-and-hold and software-selectable 2-channel multiplexer. It operates from 2.7V to 6V, draws 210µA typical supply current at 6.6ksps, auto-shuts down to 1nA, and features SPI/Microwire-compatible 4-wire serial interface - used in battery-operated remote data acquisition systems requiring low-power precision sensing.
For engineers reviewing the LTC1288IS8#PBF datasheet, LTC1288IS8#PBF pinout, LTC1288IS8#PBF application, or LTC1288IS8#PBF equivalent, key selection criteria include its 2-channel MUX architecture, VCC-referenced input structure, guaranteed ±3/4 LSB DNL, 100µs conversion time, and SO-8 package compatibility with space-constrained industrial sensor nodes.
Technical Context
The LTC1288IS8#PBF implements a switched-capacitor SAR ADC core with on-chip sample-and-hold and a configurable 2-channel analog multiplexer. Its reference input is internally tied to VCC/VREF (Pin 8), eliminating external reference components but fixing full-scale range to VCC.
It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT) where a 4-bit configuration word - including START, SGL/DIFF, ODD/SIGN, and MSBF bits - selects channel and data format before conversion. Conversion completes in 12 clock cycles, with data output LSB-first or MSB-first per MSBF bit setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar, no missing codes - delivers 4096 discrete output levels for high-fidelity sensor digitization. |
| Sampling Rate | 6.6ksps maximum - supports real-time monitoring of slow-varying physical parameters like temperature or battery voltage. |
| Supply Current | 210µA typ at 6.6ksps; drops to 1nA in shutdown - enables multi-year operation on coin-cell batteries. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonic transfer function critical for closed-loop control feedback paths. |
| Conversion Time | 100µs (12 CLK cycles @ 120kHz) - defines minimum inter-sample interval for time-triggered acquisition. |
| Input Structure | Software-selectable 2-channel MUX (CH0/CH1), single-ended or differential - allows flexible signal routing without external switches. |
| Reference Architecture | VCC-referenced (Pin 8 = VCC/VREF) - simplifies BOM by removing external reference IC while tying full-scale to supply rail. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150°C max junction temperature, θJA = 175°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS/SHDN | Chip Select / Shutdown Control | Active-low enable; logic high forces full shutdown (1nA ICC), independent of CLK/DIN activity. |
| 2: CH0 | Analog Input Channel 0 | Positive input for single-ended mode or "+" input in differential mode with CH1. |
| 3: CH1 | Analog Input Channel 1 | Negative input for single-ended mode or "–" input in differential mode with CH0. |
| 4: GND | Analog Ground Reference | Must connect directly to low-impedance analog ground plane to minimize noise coupling into SAR core. |
| 5: DIN | Serial Data Input | Receives 4-bit configuration word (START, SGL/DIFF, ODD/SIGN, MSBF) after CS fall. |
| 6: DOUT | Serial Data Output | Transmits 12-bit conversion result LSB-first or MSB-first; tri-states when CS high. |
| 7: CLK | Serial Shift Clock | Synchronizes both DIN sampling (rising edge) and DOUT output (falling edge); max 120kHz @ 2.7V. |
| 8: VCC/VREF | Power Supply & Reference Voltage | Single pin supplies power and sets full-scale range (VFS = VCC); bypass with 10µF tantalum to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces average supply current proportionally to sample rate - enables adaptive power scaling in event-driven systems. |
| Integrated sample-and-hold | Eliminates need for external S/H circuitry; supports accurate digitization of signals with source impedances up to 10kΩ. |
| VCC-referenced architecture | Removes external reference component and associated error sources - ideal for ratiometric sensor interfaces (e.g., RTDs, strain gauges). |
| Configurable 2-channel MUX | Enables dual-sensor monitoring (e.g., temperature + voltage) or differential measurement (e.g., bridge output) within one IC footprint. |
| 3-wire operation with DIN/DOUT tie | Allows microcontroller GPIO reduction by sharing bidirectional data line - validated with Intel 8051 in reference design. |
Applications
| Battery Monitoring | Remote Environmental Sensing |
|---|---|
Use Scenario: Measuring cell voltage and pack current in portable medical devices or IoT asset trackers. IC Role / Device Role / Timing Role: LTC1288IS8#PBF digitizes two analog inputs (voltage sense, current shunt) with 12-bit resolution and <100µs latency per sample. Use Value: Micropower operation extends battery life beyond 5 years in sleep-awake duty cycles; VCC-referenced design avoids drift from aging reference ICs. | Use Scenario: Deploying wireless sensor nodes in agricultural fields or industrial facilities for temperature/humidity logging. IC Role / Device Role / Timing Role: LTC1288IS8#PBF performs periodic differential measurements across thermistor pairs or RTD bridges using internal MUX. Use Value: 2-channel MUX eliminates external analog switches, reducing PCB area and failure points; 1nA shutdown current minimizes quiescent drain during 99% idle time. |
| Isolated Data Acquisition | Pen Screen Digitizing |
Use Scenario: High-voltage motor control systems requiring galvanically isolated analog front-ends for current/voltage feedback. IC Role / Device Role / Timing Role: LTC1288IS8#PBF resides on field-side, digitizing isolated sensor outputs and transmitting serial data across optocoupler or digital isolator barrier. Use Value: Low EMI 3-wire serial interface (DIN/DOUT shared) reduces isolator channel count; micropower draw eases isolated supply design. | Use Scenario: Resistive touch screen controllers in handheld terminals or kiosks requiring precise X/Y coordinate digitization. IC Role / Device Role / Timing Role: LTC1288IS8#PBF sequentially samples X and Y electrode voltages via its 2-channel MUX, supporting >100Hz touch update rates. Use Value: On-chip sample-and-hold captures fast-rising touch signals without external hold capacitor; SO-8 footprint fits tight display bezel layouts. |
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 |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, 2.7–5.25V supply, external reference required, SPI interface, MSOP-8 package | Higher speed but no auto-shutdown; requires external reference and decoupling - less suitable for ultra-low-power battery use | Select ADS7822U only when >10ksps sampling is needed and external reference tolerance is acceptable. |
| MAX11131ASA+ | 12-bit, 100ksps, 2.7–3.6V supply, internal reference, SPI interface, SO-8 package, 1.5µA shutdown current | Lower shutdown current than LTC1288IS8#PBF (1.5µA vs 1nA), but lacks MUX and uses internal bandgap reference instead of VCC-referenced | Select MAX11131ASA+ when internal reference stability is prioritized over ultra-low shutdown current and dual-channel flexibility. |
Compared with ADS7822U and MAX11131ASA+, the LTC1288IS8#PBF uniquely combines VCC-referenced operation, integrated 2-channel MUX, and true 1nA shutdown - making it optimal for cost-sensitive, space-constrained, battery-powered systems needing dual-input flexibility without external support components.
Availability
LTC1288IS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, remote environmental sensing, and isolated data acquisition requiring stable component supply, long-lifecycle availability, and RoHS-compliant SO-8 packaging.
Supply support for LTC1288IS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1288IS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for ultra-low-power, space-constrained sensor interface applications where micropower efficiency and integration reduce system-level complexity.
FAQ
What is the reference voltage configuration of the LTC1288IS8#PBF?
The LTC1288IS8#PBF uses a VCC-referenced architecture: Pin 8 (VCC/VREF) serves as both power supply and reference input, setting full-scale range equal to VCC. This eliminates external reference components and supports ratiometric measurements, but ties accuracy directly to supply rail stability.
Does the LTC1288IS8#PBF support differential input measurements?
Yes, the LTC1288IS8#PBF supports differential measurements between CH0 and CH1 via software configuration. When configured in differential mode (SGL/DIFF = 0), it measures the voltage difference (CH0 – CH1) with respect to GND, enabling bridge sensor and noise-rejecting applications.
Can the LTC1288IS8#PBF operate with a 5V supply?
Yes, the LTC1288IS8#PBF operates across 2.7V to 6V. At 5V, full-scale range becomes 5V, resolution improves to ~1.22mV/LSB, and maximum clock frequency increases to ~180kHz - verified in the datasheet's "Maximum Clock Frequency vs Supply Voltage" curve.
How does the auto-shutdown feature work in the LTC1288IS8#PBF?
The LTC1288IS8#PBF automatically enters ultra-low-power shutdown (1nA ICC) whenever CS/SHDN (Pin 1) is held high. During active conversion (CS low), it draws 210µA typical; after conversion completes, internal bias circuits power down even if CS remains low - minimizing energy per sample.
Is the LTC1288IS8#PBF pin-compatible with the LTC1285 series?
No, the LTC1288IS8#PBF is not pin-compatible with the LTC1285 series. While both use SO-8 packages, LTC1285 has differential IN+/IN– pins (Pins 2/3) and VREF input (Pin 1), whereas LTC1288IS8#PBF uses CH0/CH1 (Pins 2/3) and DIN (Pin 5), with VCC/VREF on Pin 8 - requiring PCB layout change for substitution.
LTC1288IS8#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):
- 6.6k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- -
LTC1288IS8#PBF FAQ
1.How can I place an order for LTC1288IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1288IS8#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 LTC1288IS8#PBF reliable?
The price and inventory of LTC1288IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1288IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1288IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1288IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1288IS8#PBF?
LTC1288IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1288IS8#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 LTC1288IS8#PBF?
For technical support, including LTC1288IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1288IS8#PBF requirements.
6.How does Aetrix verify that LTC1288IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1288IS8#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 LTC1288IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1288IS8#PBF?
All LTC1288IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1288IS8#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 LTC1288IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1288IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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