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Analog Devices Inc. LTC1288CN8#PBF
- Part No.:
- LTC1288CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1288CN8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,022
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Product details
Overview
LTC1288CN8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit successive approximation ADC with integrated 2-channel analog multiplexer, serial interface, and on-chip sample-and-hold. It operates from 2.7V to 6V, draws 210µA typical supply current at 6.6ksps sampling rate, guarantees ±3/4LSB max DNL, and features auto-shutdown to 1nA. It is used in battery-operated remote data acquisition systems requiring low-power, isolated analog sensing.
For engineers reviewing the LTC1288CN8#PBF datasheet, LTC1288CN8#PBF pinout, LTC1288CN8#PBF application, or LTC1288CN8#PBF equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated SO-8 package and pin functions, confirmed application roles in sensor monitoring and isolated acquisition, and two rigorously cross-checked alternative parts with documented functional and interface differences.
Technical Context
The LTC1288CN8#PBF implements a switched-capacitor SAR architecture with a software-configurable 2-channel MUX, enabling single-ended or differential conversions between CH0 and CH1. Its serial interface uses a synchronous half-duplex 4-wire protocol (CS/SHDN, CLK, DIN, DOUT), supporting MSB-first or LSB-first output via programmable MSBF bit.
It integrates an internal bias and shutdown circuit that powers down comparator and reference paths after conversion, reducing ICC to leakage levels when CS is high. The VCC/VREF pin serves dual function-supply voltage input and reference source-eliminating need for external reference but fixing full-scale span to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonic transfer curve and unambiguous digital representation of analog inputs. |
| Sampling Rate | 6.6ksps maximum - defines real-time throughput for continuous monitoring of slow-varying sensor signals. |
| Supply Current | 210µA typ at 6.6ksps; drops to 1nA typ in shutdown - enables multi-year operation on coin-cell batteries in portable sensors. |
| Differential Nonlinearity | ±3/4LSB max - guarantees monotonicity and supports precise ratiometric measurements without calibration. |
| Conversion Time | 100µs per sample - determines minimum inter-sample interval and system latency in closed-loop control. |
| Analog Input Range | 0V to VCC (single-ended) or ±VCC/2 (differential) - allows direct connection to transducers without gain stages when VCC ≥ 3V. |
| Reference Architecture | Internal VCC-referenced - eliminates external reference component count but ties full-scale accuracy to supply regulation. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, N8), 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS/SHDN | Chip Select / Shutdown Control | Active-low enable; logic high places device in ultra-low-power shutdown (1nA ICC), independent of clock activity. |
| 2: CH0 | Analog Input Channel 0 | Positive input terminal for single-ended or differential mode; high-impedance (>2700MΩ when CS=VIH) minimizes loading on sensors. |
| 3: CH1 | Analog Input Channel 1 | Second analog input; selectable as negative input in differential mode or as independent single-ended channel. |
| 4: GND | Analog Ground Reference | Must connect directly to low-noise analog ground plane; separates signal return from digital switching noise. |
| 5: DIN | Serial Data Input | Receives 3-bit MUX configuration word (SGL/DIFF, ODD/SIGN, MSBF) after start bit; enables flexible channel selection. |
| 6: DOUT | Serial Data Output | Transmits 12-bit conversion result MSB-first or LSB-first; tri-state when CS high, supports 3-wire bus sharing with DIN. |
| 7: CLK | Serial Shift Clock | Synchronizes all data transfers; falling edge clocks data out, rising edge captures DIN; max 120kHz at 2.7V. |
| 8: VCC/VREF | Power Supply & Reference Input | Single pin supplies power and sets full-scale range; bypassing with 10µF tantalum capacitor is mandatory for AC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown to 1nA | Enables energy harvesting and battery-powered deployments where duty-cycled sampling dominates system lifetime. |
| Software-selectable 2-channel MUX | Supports dynamic reconfiguration between CH0–GND, CH1–GND, or CH0–CH1 differential without hardware change. |
| On-chip sample-and-hold | Acquires stable analog value during conversion; eliminates need for external S/H circuit in low-bandwidth (<10kHz) applications. |
| I/O compatible with SPI/Microwire | Reduces MCU resource usage; allows reuse of existing serial peripheral drivers without custom timing logic. |
| High-impedance analog inputs | Input leakage <±1µA enables direct connection to high-Z sources like thermistors or pH electrodes without buffer amplifiers. |
Applications
| Battery Monitoring | Remote Temperature Sensing |
|---|---|
Use Scenario: Measuring cell voltage and pack temperature in wireless IoT battery packs with 10-year target lifespan. IC Role / Device Role / Timing Role: LTC1288CN8#PBF performs periodic 6.6ksps sampling of voltage divider and thermistor outputs, then enters 1nA shutdown until next wake-up event. Use Value: 210µA active current and 1nA shutdown current extend coin-cell life beyond 5 years under typical 1Hz sampling duty cycle. |
Use Scenario: Distributed environmental monitoring nodes deployed in inaccessible locations with solar charging. IC Role / Device Role / Timing Role: LTC1288CN8#PBF digitizes thermistor and humidity sensor outputs using CH0–GND and CH1–GND configurations, synchronized to low-power MCU sleep cycles. Use Value: Integrated MUX and auto-shutdown eliminate external multiplexer and power-gating logic, reducing BOM count by 3 components per node. |
| Isolated Data Acquisition | Pen Screen Digitizing |
Use Scenario: Medical sensor front-end where analog signals cross galvanic isolation barrier before digitization. IC Role / Device Role / Timing Role: LTC1288CN8#PBF resides on isolated side, converting analog sensor outputs and transmitting results via opto-isolated serial link. Use Value: Micropower operation (210µA) minimizes heat generation and power dissipation on isolated side, critical for Class II medical compliance. |
Use Scenario: Resistive touch screen controller in handheld devices requiring low-latency coordinate capture. IC Role / Device Role / Timing Role: LTC1288CN8#PBF samples X/Y electrode voltages sequentially using CH0/CH1 MUX, delivering 12-bit coordinates at >100Hz update rate. Use Value: 100µs conversion time and 6.6ksps throughput support sub-10ms response time for stylus tracking without oversampling. |
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, 3.3V-only supply, external reference required, no integrated MUX | Higher speed but lacks on-chip MUX and VCC-referenced operation; requires external ref and level-shifting for 5V systems | Select when higher sampling rate and external precision reference are needed; avoid if board space or BOM count is constrained. |
| MAX11131ASA+ | 8-pin SO, 12-bit, 100ksps, 2.7V–3.6V supply, internal reference, single-ended only, no MUX | Lower power (150µA @ 10ksps) but no differential or dual-channel capability; fixed internal 2.048V reference | Select for ultra-low-power single-input applications where differential measurement is unnecessary and reference voltage must be stable. |
Compared with LTC1288CN8#PBF, ADS7822U offers 30× faster sampling but demands external reference and adds layout complexity, while MAX11131ASA+ reduces supply current by 29% yet sacrifices MUX flexibility and differential input-making LTC1288CN8#PBF optimal for cost-sensitive, dual-sensor, battery-constrained designs.
Availability
LTC1288CN8#PBF is available at Aetrix Electronics and suitable for battery monitoring, remote temperature sensing, and isolated data acquisition requiring stable component supply across industrial and medical OEM programs.
Supply support for LTC1288CN8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1288CN8#PBF belongs to ADI's legacy Linear Technology micropower precision ADC family, designed specifically for ultra-low-power, space-constrained sensor interfaces in portable and remote instrumentation.
FAQ
What is the maximum clock frequency supported by the LTC1288CN8#PBF?
The LTC1288CN8#PBF supports up to 120kHz clock frequency at VCC = 2.7V. This limit increases with supply voltage-reaching ~300kHz at 6V-as shown in the "Maximum Clock Frequency vs Supply Voltage" plot in the datasheet. Exceeding the rated fCLK causes conversion errors due to insufficient settling time in the capacitive DAC array.
Does the LTC1288CN8#PBF require an external reference voltage?
No, the LTC1288CN8#PBF does not require an external reference voltage. Its VCC/VREF pin serves as both power supply and reference source, setting full-scale range equal to VCC. This simplifies design but ties measurement accuracy directly to supply regulation and noise performance.
Can the LTC1288CN8#PBF perform differential measurements?
Yes, the LTC1288CN8#PBF supports differential measurements between CH0 and CH1 when configured via the SGL/DIFF bit in the DIN command word. In differential mode, it measures the voltage difference (CH0 – CH1) with common-mode rejection limited by its internal architecture and layout.
How does the auto-shutdown feature work on the LTC1288CN8#PBF?
The LTC1288CN8#PBF automatically enters ultra-low-power shutdown (1nA ICC) whenever CS/SHDN is driven high. During shutdown, the bias circuit, comparator, and reference path are disabled. Clock and DIN activity have no effect on current draw-only the CS pin state controls power state.
What is the purpose of the DIN pin on the LTC1288CN8#PBF?
The DIN pin on the LTC1288CN8#PBF receives a 3-bit configuration word (after the start bit) that selects single-ended/differential mode, channel polarity, and MSB/LSB output order. This enables dynamic reconfiguration of the internal 2-channel MUX without changing hardware connections.
LTC1288CN8#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):
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1288CN8#PBF FAQ
1.How can I place an order for LTC1288CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1288CN8#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 LTC1288CN8#PBF reliable?
The price and inventory of LTC1288CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1288CN8#PBF is usually 5 days.
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4.How is shipping managed for LTC1288CN8#PBF?
LTC1288CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1288CN8#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 LTC1288CN8#PBF?
For technical support, including LTC1288CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1288CN8#PBF requirements.
6.How does Aetrix verify that LTC1288CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1288CN8#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 LTC1288CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1288CN8#PBF?
All LTC1288CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1288CN8#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 LTC1288CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1288CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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