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Analog Devices Inc. LTC1288IS8#TRPBF
- Part No.:
- LTC1288IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1288IS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
LTC1288IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 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 ±3/4 LSB max DNL, and is housed in an 8-pin SOIC package. It enables low-power remote data acquisition in battery-operated sensor systems.
For engineers reviewing the LTC1288IS8#TRPBF datasheet, LTC1288IS8#TRPBF pinout, LTC1288IS8#TRPBF application, or LTC1288IS8#TRPBF equivalent, key selection criteria include its software-selectable dual-channel MUX architecture, 1nA shutdown current, SPI/Microwire-compatible 4-wire serial interface, differential or single-ended input configuration, and guaranteed monotonicity over temperature.
Technical Context
The LTC1288IS8#TRPBF implements a switched-capacitor SAR architecture with internal reference tied to VCC/VREF (Pin 8), enabling ratiometric operation without external reference components. Its 2-channel MUX supports configurable differential (CH0–CH1, CH1–CH0) or single-ended (CH0–GND, CH1–GND) measurements via 3-bit DIN command word.
Conversion is initiated by CS↓ followed by a start bit and MUX address on DIN; result appears on DOUT after one null bit, with programmable MSB-first or LSB-first output format. The device automatically powers down bias circuitry and comparator post-conversion, reducing ICC to leakage levels while CLK continues running for data clock-out.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures full-scale monotonic transfer function for precision measurement. |
| Sampling Rate | 6.6 ksps maximum - supports real-time monitoring of slow-varying industrial and environmental signals. |
| Supply Current | 210 µA typical at 6.6 ksps, 1 nA typical in shutdown - enables multi-year battery life in portable sensors. |
| Differential Nonlinearity | ±3/4 LSB max - guarantees monotonicity and eliminates code ambiguity in closed-loop control feedback. |
| Input Configuration | Software-selectable 2-channel MUX (CH0/CH1) with differential or single-ended modes - simplifies multi-sensor interfacing without external switches. |
| Serial Interface | 4-wire synchronous half-duplex (CS, CLK, DIN, DOUT), SPI/Microwire compatible - reduces MCU GPIO count and supports isolation barrier implementation. |
| Reference Architecture | Internal reference tied to VCC/VREF pin - eliminates external reference IC, reduces BOM cost and board area in ratiometric sensor applications. |
Pinout & Package
Package: 8-lead plastic SOIC (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 places device in 1nA shutdown - enables system-level power gating. |
| 2: CH0 | Analog Input Channel 0 | Positive input for single-ended mode or "+" input for differential mode - directly interfaces with resistive sensors or transducer outputs. |
| 3: CH1 | Analog Input Channel 1 | Negative input for differential mode or second single-ended channel - supports thermocouple cold-junction compensation or bridge offset measurement. |
| 4: GND | Analog Ground Reference | Must connect directly to analog ground plane - critical for maintaining 12-bit accuracy and minimizing noise coupling. |
| 5: DIN | Digital Data Input | Receives 3-bit MUX address and control bits (SGL/DIFF, ODD/SIGN, MSBF) - defines conversion source and data format before conversion starts. |
| 6: DOUT | Digital Data Output | Serial 12-bit result output (MSB-first or LSB-first); tri-state when CS high - allows shared bus operation with DIN tied together in 3-wire configurations. |
| 7: CLK | Serial Shift Clock | Synchronizes DIN data capture and DOUT data shift-out; falling edge clocks data, rising edge captures - defines conversion timing and data throughput. |
| 8: VCC/VREF | Power Supply and Reference Voltage | Single pin supplies power and sets full-scale range (VFS = VCC); enables ratiometric operation with supply-tolerant accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces ICC to 1nA typical without external control - eliminates need for sleep-state firmware management in ultra-low-power microcontrollers. |
| Configurable MUX input topology | Supports both differential (CH0–CH1) and single-ended (CH0–GND, CH1–GND) measurement via DIN command - replaces discrete analog switches in multi-sensor nodes. |
| Ratiometric reference architecture | VCC/VREF pin serves as both supply and reference - removes reference drift error and simplifies design for battery-powered pressure or temperature sensors. |
| High-impedance analog inputs | 20pF on-channel input capacitance, ±1µA leakage - allows direct connection to high-Z sources like thermistors or pH electrodes without buffer amplifiers. |
| Reduced full-scale span capability | Operates down to 1.5V full scale - achieves 366µV LSB resolution for sub-millivolt signal conditioning in medical or instrumentation front-ends. |
Applications
| Battery Monitoring | Remote Environmental Sensing |
|---|---|
Use Scenario: Measuring cell voltage and temperature in multi-cell Li-ion battery packs deployed in wireless asset trackers. IC Role / Device Role / Timing Role: Dual-channel ADC samples voltage (CH0) and thermistor voltage (CH1) sequentially to compute state-of-charge and thermal derating. Use Value: 210µA active current and 1nA shutdown enable >5-year battery life; ratiometric operation compensates for supply droop during pulse loads. |
Use Scenario: Wireless soil moisture and ambient temperature node powered by solar-charged LiFePO₄ battery in agricultural IoT deployment. IC Role / Device Role / Timing Role: Configures CH0 for capacitive soil sensor and CH1 for NTC thermistor, performing synchronized differential readings to reject common-mode noise. Use Value: On-chip sample-and-hold and 6.6ksps rate support accurate integration of noisy sensor outputs; SO-8 package fits compact PCB layouts. |
| Isolated Industrial Data Acquisition | Pen-Based Human Interface |
Use Scenario: Isolated analog input module for PLC analog I/O card, measuring 4–20mA loop signals across reinforced insulation barrier. IC Role / Device Role / Timing Role: Converts isolated current-to-voltage output using CH0–CH1 differential mode to reject ground potential differences across the barrier. Use Value: 4-wire serial interface allows opto-isolator or digital isolator implementation with minimal component count; ±3/4 LSB DNL ensures compliance with IEC 61000-4-5 immunity testing. |
Use Scenario: Digitizing analog pen-tip position on resistive touch overlay in handheld medical diagnostic device. IC Role / Device Role / Timing Role: Scans X/Y electrode pairs via CH0/CH1 MUX at 6.6ksps to resolve pen location with <1mm accuracy under variable contact pressure. Use Value: Low 160ns DOUT delay and 100µs conversion time enable real-time stylus tracking; SO-8 footprint simplifies routing beneath display stack-up. |
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, 200ksps, 1.25mW @ 5V, external reference required, no MUX | Higher speed but higher power; lacks integrated MUX and auto-shutdown - requires external power management logic | Select when sampling rate >10ksps is needed and external reference is acceptable; not drop-in due to different pinout and control protocol |
| MCP3202-I/P | 8-pin PDIP/SOIC, 12-bit, 100ksps, 500µA @ 3V, SPI-only, dual-channel with fixed single-ended inputs | No differential mode; no shutdown current spec below 1µA; higher supply current reduces battery life in always-on nodes | Choose for cost-sensitive industrial controls where continuous sampling is acceptable and differential measurement is unnecessary |
Compared with ADS7822U and MCP3202-I/P, the LTC1288IS8#TRPBF uniquely combines ultra-low 1nA shutdown, integrated MUX, and ratiometric VCC-referenced operation - making it optimal for energy-constrained, multi-sensor, battery-powered systems requiring long-term reliability without external support components.
Availability
LTC1288IS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated industrial sensing requiring stable component supply and long-lifecycle support.
Supply support for LTC1288IS8#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, 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 LTC1288IS8#TRPBF 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 outweigh raw speed requirements.
FAQ
What is the maximum sampling rate of the LTC1288IS8#TRPBF?
The LTC1288IS8#TRPBF supports a maximum sampling rate of 6.6 ksps under recommended operating conditions (VCC = 2.7V, fCLK = 120kHz). This rate is achievable with proper timing margins for CS setup, DIN hold, and DOUT data validity. At lower clock frequencies or reduced supply voltages, the effective sampling rate decreases linearly to maintain conversion accuracy and monotonicity.
Does the LTC1288IS8#TRPBF require an external reference voltage?
No, the LTC1288IS8#TRPBF does not require an external reference voltage. Its VCC/VREF pin (Pin 8) serves as both power supply and reference input, enabling true ratiometric operation. Full-scale range equals the applied VCC voltage, eliminating reference drift and simplifying design for battery-powered sensor nodes where supply voltage varies.
Can the LTC1288IS8#TRPBF operate with a 5V supply?
Yes, the LTC1288IS8#TRPBF is fully specified for operation from 2.7V to 6V, including 5V. At 5V, its maximum recommended clock frequency increases to approximately 200kHz, and input logic thresholds scale accordingly. All DC and AC specifications-including DNL, INL, and SNR-remain valid across the full supply range per the datasheet's recommended operating conditions.
How does the LTC1288IS8#TRPBF achieve 1nA shutdown current?
The LTC1288IS8#TRPBF achieves 1nA typical shutdown current by gating off all internal bias circuits-including the comparator, reference buffer, and sample-and-hold amplifier-when CS is driven high to VCC. This deep shutdown state is independent of CLK or DIN activity, allowing continuous clocking without increased current draw, which is critical for isolated or energy-harvesting systems.
What is the purpose of the DIN pin on the LTC1288IS8#TRPBF?
The DIN pin on the LTC1288IS8#TRPBF receives a 3-bit configuration word that selects the analog input channel (CH0 or CH1), input mode (single-ended or differential), sign bit, and data output format (MSB-first or LSB-first). This command is latched after the start bit and determines the measurement topology before conversion begins-enabling flexible sensor interfacing without external MUX hardware.
LTC1288IS8#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1288IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1288IS8#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 LTC1288IS8#TRPBF reliable?
The price and inventory of LTC1288IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1288IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1288IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1288IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1288IS8#TRPBF?
LTC1288IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1288IS8#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 LTC1288IS8#TRPBF?
For technical support, including LTC1288IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1288IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1288IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1288IS8#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 LTC1288IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1288IS8#TRPBF?
All LTC1288IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1288IS8#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 LTC1288IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1288IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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