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Analog Devices Inc. LTC1298IS8#PBF
- Part No.:
- LTC1298IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1298IS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC1298IS8#PBF from Analog Devices is a micropower, 12-bit successive approximation ADC with integrated sample-and-hold and software-selectable 2-channel analog multiplexer. It operates from a 4.5V to 5.5V single supply, draws 360µA typical supply current at 11.1 ksps sampling rate, and features SPI/Microwire-compatible 4-wire serial interface. It is used in battery-powered remote data acquisition systems requiring low-power, dual-input analog monitoring.
For engineers reviewing the LTC1298IS8#PBF datasheet, LTC1298IS8#PBF pinout, LTC1298IS8#PBF application, or LTC1298IS8#PBF equivalent, key selection considerations include its 2-channel MUX architecture, guaranteed ±3/4 LSB DNL, auto-shutdown to 1nA, 60µs conversion time, and SOIC-8 package compatibility with space-constrained embedded sensor interfaces.
Technical Context
The LTC1298IS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a configurable 2-channel analog multiplexer. Its serial interface requires a start bit followed by a 3-bit input word (SGL/DIFF, ODD/SIGN, MSBF) to select channel and data format before outputting the 12-bit result.
It supports both single-ended (CH0–GND, CH1–GND) and differential (CH0–CH1) measurement modes, with reference tied internally to VCC/VREF (Pin 8). The device powers down automatically when CS/SHDN (Pin 1) is high, reducing supply current to 1nA typical - critical for intermittent-sampling applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - enables 4096 discrete levels for precision sensor digitization. |
| Sampling Rate | 11.1 ksps maximum - supports real-time monitoring of slow-to-moderate dynamics (e.g., temperature, battery voltage). |
| Supply Current | 360 µA typ. at full rate; drops to 1 nA in shutdown - extends battery life in portable instrumentation. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonic transfer function and accurate code transitions across full scale. |
| Conversion Time | 60 µs - defines minimum inter-sample interval and supports deterministic timing in firmware-controlled acquisitions. |
| Analog Input Range | 0 V to VCC/VREF (Pin 8) - eliminates need for external reference or level-shifting in single-supply systems. |
| Interface Protocol | Synchronous 4-wire serial (CS/SHDN, CLK, DIN, DOUT) - compatible with standard microcontroller SPI peripherals using half-duplex mode. |
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 ultra-low-power shutdown (1nA), independent of CLK/DIN activity. |
| 2: CH0 | Analog Input Channel 0 | Primary single-ended or differential input; high-impedance node (20 pF) suitable for direct transducer connection. |
| 3: CH1 | Analog Input Channel 1 | Secondary input for multiplexed or differential measurements; leakage < ±1 µA over temperature. |
| 4: GND | Analog Ground Reference | Must connect directly to analog ground plane to minimize noise coupling into sample-and-hold circuitry. |
| 5: DIN | Serial Data Input | Accepts 3-bit MUX configuration word (start bit + SGL/DIFF, ODD/SIGN, MSBF) on rising CLK edges. |
| 6: DOUT | Serial Data Output | Outputs 12-bit conversion result LSB-first or MSB-first per MSBF bit; Hi-Z when CS high or after tdis (135 ns). |
| 7: CLK | Serial Shift Clock | Controls data transfer timing and conversion speed; max 200 kHz at 5V; clock edge triggers DIN sampling and DOUT output. |
| 8: VCC/VREF | Power Supply & Reference Voltage | Single pin supplies power and sets full-scale range (0 V to VCC); bypassing to GND essential for noise-sensitive ADC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown to 1nA | Eliminates manual power sequencing; enables energy harvesting and multi-year battery operation in wake-on-event systems. |
| Integrated 2-channel MUX | Reduces external component count and PCB area versus discrete multiplexer + ADC solutions. |
| On-chip sample-and-hold | Removes need for external S/H circuit; supports accurate sampling of high-impedance sources (e.g., thermistors, pH electrodes). |
| Reference tied to VCC | Simplifies design by removing external reference IC; maintains ratiometric accuracy when sensor excitation shares same supply. |
| I/O compatibility with SPI/Microwire | Enables direct interfacing with common microcontrollers (e.g., STM32, MSP430) without protocol translation logic. |
Applications
| Battery Monitoring | Remote Sensor Node |
|---|---|
Use Scenario: Monitoring cell voltage and pack temperature in lithium-ion battery management systems. IC Role / Device Role / Timing Role: Dual-input ADC digitizes voltage (CH0) and thermistor voltage (CH1) sequentially every 100 ms during sleep-mode polling. Use Value: 12-bit resolution captures <1 mV changes; 1nA shutdown current minimizes quiescent drain between readings. | Use Scenario: Wireless environmental sensor collecting temperature and humidity via resistive sensors. IC Role / Device Role / Timing Role: Configured for single-ended CH0 (temp) and CH1 (humidity), sampled at 1 Hz with MCU-triggered conversions. Use Value: Integrated MUX and S/H allow direct connection to high-Z sensors; micropower operation extends node lifetime beyond 5 years on coin cell. |
| Handheld Diagnostic Tool | Isolated Industrial Input Module |
Use Scenario: Portable multimeter-style device measuring DC voltage and current simultaneously. IC Role / Device Role / Timing Role: Uses differential mode (CH0–CH1) for current shunt sensing and single-ended CH0 for voltage rail measurement. Use Value: ±3/4 LSB DNL ensures accurate calibration traceability; SOIC-8 footprint fits compact handheld enclosure. | Use Scenario: DIN-rail mounted I/O module acquiring analog signals across galvanic isolation barrier. IC Role / Device Role / Timing Role: ADC resides on field-side; serial data transmitted through optocoupler or digital isolator to host controller. Use Value: Low 360 µA active current reduces isolated-side power budget; 3-wire operation (DIN/DOUT tied) simplifies isolator pin count. |
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 | 8-pin SOIC, 12-bit, 200 ksps, 3.3V-only supply, internal reference, no MUX | Higher speed but lacks dual-input flexibility; requires external reference for 5V systems | Select when higher throughput is needed and single-channel operation suffices. |
| MCP3202-I/P | 8-pin PDIP/SOIC, 12-bit, 100 ksps, SPI interface, dual-channel MUX, 2.7–5.5V supply | Similar MUX capability but no auto-shutdown; typical active current 500 µA at 10 ksps | Select when lower cost is prioritized and 1nA shutdown is not required. |
Compared with ADS7822U and MCP3202-I/P, the LTC1298IS8#PBF uniquely combines ultra-low shutdown current (1nA), integrated 2-channel MUX, and 5V-compatible operation - making it optimal for long-life, dual-sensor battery-powered designs where power budget is constrained below 1 µA average.
Availability
LTC1298IS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, remote sensor nodes, and handheld diagnostic tools requiring stable component supply and guaranteed long-term availability.
Supply support for LTC1298IS8#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1298IS8#PBF belongs to the LTC® micropower precision ADC product line, designed specifically for ultra-low-power data acquisition in portable, remote, and energy-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the LTC1298IS8#PBF?
The LTC1298IS8#PBF supports a maximum clock frequency of 200 kHz when operating from a 5V supply. At higher supply voltages (up to 5.5V), the maximum clock frequency remains 200 kHz per datasheet specifications. Exceeding this limit may cause conversion errors or increased DNL due to insufficient internal settling time.
Does the LTC1298IS8#PBF require an external reference voltage?
No, the LTC1298IS8#PBF does not require an external reference. Its reference is internally tied to the VCC/VREF pin (Pin 8), establishing a full-scale range of 0 V to VCC. This simplifies design in single-supply systems and supports ratiometric measurements when sensors share the same supply rail.
How does the LTC1298IS8#PBF handle channel selection during conversion?
The LTC1298IS8#PBF selects channels via a 3-bit input word shifted into DIN after the start bit: SGL/DIFF (single-ended vs differential), ODD/SIGN (channel polarity), and MSBF (MSB-first vs LSB-first output). For example, "SGL=1, ODD/SIGN=0, MSBF=0" configures single-ended CH0 with LSB-first output. The LTC1298IS8#PBF executes the conversion immediately after receiving the full word.
Can DIN and DOUT be connected to the same microcontroller pin for the LTC1298IS8#PBF?
Yes, DIN and DOUT can be tied together for 3-wire operation. The LTC1298IS8#PBF drives DOUT low on the 4th falling CLK edge after the start bit, so the MCU must release the shared line as an input before that edge. This reduces MCU pin count and simplifies isolation in systems like industrial I/O modules.
What is the guaranteed differential nonlinearity (DNL) specification for the LTC1298IS8#PBF?
The LTC1298IS8#PBF guarantees ±3/4 LSB maximum DNL over temperature and supply voltage ranges. This ensures monotonicity across all 4096 codes and supports precise linear interpolation in measurement applications such as temperature or pressure sensing where code consistency is critical.
LTC1298IS8#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):
- 11.1k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1298IS8#PBF FAQ
1.How can I place an order for LTC1298IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1298IS8#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 LTC1298IS8#PBF reliable?
The price and inventory of LTC1298IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1298IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1298IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1298IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1298IS8#PBF?
LTC1298IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1298IS8#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 LTC1298IS8#PBF?
For technical support, including LTC1298IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1298IS8#PBF requirements.
6.How does Aetrix verify that LTC1298IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1298IS8#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 LTC1298IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1298IS8#PBF?
All LTC1298IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1298IS8#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 LTC1298IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1298IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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