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Analog Devices Inc. LTC1298IN8#PBF
- Part No.:
- LTC1298IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1298IN8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,219
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Product details
Overview
LTC1298IN8#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 4.5V to 5.5V supply, draws 360µA typical supply current at 11.1 ksps sampling rate, and features auto-shutdown to 1nA. It is used in battery-powered remote data acquisition systems where low quiescent power and dual-input flexibility are critical.
For engineers reviewing the LTC1298IN8#PBF datasheet, LTC1298IN8#PBF pinout, LTC1298IN8#PBF application, or LTC1298IN8#PBF equivalent, key selection criteria include its 8-pin SOIC package, SPI/Microwire-compatible 4-wire serial interface, differential or single-ended channel selection via DIN control word, guaranteed ±3/4 LSB DNL, and operation over –40°C to +85°C industrial temperature range.
Technical Context
The LTC1298IN8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a 3-bit configuration register accessed via DIN. Its 2-channel MUX supports four input modes: CH0–GND, CH1–GND, CH0–CH1, and CH1–CH0, selected by SGL/DIFF and ODD/SIGN bits.
It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT), where CS falling edge initiates transfer, a start bit enables the input word, and conversion result appears after one null bit. The reference is internally tied to VCC/VREF (Pin 8), eliminating external reference components but fixing full-scale range to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - delivers 4096 distinct output levels for precise sensor digitization. |
| Sampling Rate | 11.1 ksps maximum - supports real-time monitoring of slow-varying physical parameters like temperature or pressure. |
| Supply Current | 360 µA typ. at 200 kHz clock - enables multi-year battery life in portable instrumentation when paired with duty-cycled CS control. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonicity and accurate end-point linearity for calibration-critical measurement systems. |
| Input Configuration | Software-selectable 2-channel MUX - allows dynamic switching between single-ended and differential measurements without hardware change. |
| Reference Architecture | Internal VCC-referenced - eliminates external reference IC and associated layout complexity, simplifying BOM and PCB design. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry nodes. |
Pinout & Package
Package: 8-lead plastic SOIC (N8), 3.9 mm × 4.9 mm, standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS/SHDN (1) | Chip Select / Shutdown Control | Active-low enable; logic high places device in 1nA shutdown - primary power-gating signal for ultra-low-duty-cycle operation. |
| CH0 (2) | Analog Input Channel 0 | Primary single-ended or differential input; high-impedance node (20 pF) requiring low-source-impedance drive for <0.1 LSB error. |
| CH1 (3) | Analog Input Channel 1 | Secondary input for differential pair or alternate single-ended measurement; shares same input structure and leakage specs as CH0. |
| GND (4) | Analog Ground Reference | Must connect directly to clean analog ground plane - serves as return for all analog signals and internal bias currents. |
| DIN (5) | Serial Data Input | Accepts 3-bit MUX configuration word (START, SGL/DIFF, ODD/SIGN) on rising CLK edges - defines next conversion mode. |
| DOUT (6) | Serial Data Output | Outputs 12-bit conversion result LSB-first or MSB-first (configurable via MSBF bit); tri-stated when CS high. |
| CLK (7) | Serial Clock Input | Synchronizes all data transfers; 200 kHz max at 5V - determines conversion time (90 µs total cycle) and sampling rate. |
| VCC/VREF (8) | Power Supply & Reference Voltage | Single pin supplies power and sets full-scale range (VFS = VCC); bypassing to GND is mandatory for noise-sensitive applications. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 360 µA typical active current and 1 nA shutdown current - enables >10-year battery life in wireless sensor nodes with 1 Hz sampling. |
| Integrated 2-channel MUX | Four selectable input configurations via 3-bit DIN command - eliminates external analog switches and reduces board area and component count. |
| VCC-referenced architecture | No external reference required - simplifies design, lowers cost, and avoids drift errors from separate reference ICs. |
| SPI/Microwire compatibility | 4-wire synchronous interface with configurable MSB/LSB-first output - interoperates with common microcontrollers (e.g., 8051, ARM Cortex-M) without protocol translation. |
| Auto-shutdown between conversions | Automatic power-down after conversion completes - removes need for firmware-controlled power sequencing and improves system reliability. |
Applications
| Battery Monitoring | Remote Temperature Sensing |
|---|---|
|
Use Scenario: Measuring voltage across multiple series-connected Li-ion cells in portable medical devices or UPS units. IC Role / Device Role / Timing Role: Dual-channel ADC samples cell voltages sequentially using CH0/CH1 inputs, with automatic shutdown minimizing self-discharge during idle periods. Use Value: Enables accurate state-of-charge estimation without external references or multiplexers, extending battery runtime by reducing quiescent current to 1 nA between reads. |
Use Scenario: Digitizing outputs from thermistors or RTDs in distributed environmental monitoring nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Configured for single-ended CH0–GND mode to read grounded-sensor outputs; CS-controlled burst sampling aligns with wireless transmit intervals. Use Value: Delivers 12-bit resolution at sub-µA average current, supporting >5-year field deployment without battery replacement in unattended installations. |
| Isolated Data Acquisition | Handheld Terminal Interface |
|
Use Scenario: Capturing analog sensor data across galvanic isolation barriers in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Operates on isolated 5V rail; serial interface transmits digitized values through optocouplers or digital isolators with minimal timing skew. Use Value: Low 360 µA active current reduces heat generation on isolated side, while 1nA shutdown prevents leakage-induced drift in high-impedance isolated circuits. |
Use Scenario: Reading analog buttons, potentiometers, or touch sliders in rugged handheld test equipment with limited PCB space. IC Role / Device Role / Timing Role: Uses CH0/CH1 to scan multiple front-panel controls; compact SOIC-8 package fits tight mechanical envelopes. Use Value: Eliminates need for external level-shifting or reference circuitry, reducing bill-of-materials and enabling direct MCU interface via three-wire DIN/DOUT shared bus. |
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, external reference required | Higher speed but lacks auto-shutdown and MUX; requires external ref and level-shifting for 5V systems | Select when sampling rate >11.1 ksps is needed and system already uses 3.3V rails and precision external references. |
| MAX11131AUT+T | 8-pin µDFN, 12-bit, 100 ksps, internal reference, 1.8V–3.6V supply | Smaller package and lower voltage, but not rated for –40°C to +85°C; no MUX functionality | Prefer for space-constrained, low-voltage battery designs where industrial temp range is not required. |
Compared with ADS7822U and MAX11131AUT+T, the LTC1298IN8#PBF uniquely combines industrial temperature rating, integrated MUX, VCC-referencing, and sub-µA shutdown - making it optimal for cost-sensitive, battery-powered industrial sensors where simplicity and longevity outweigh raw speed.
Availability
LTC1298IN8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition nodes, and handheld terminal interfaces requiring stable component supply and long-term industrial temperature support.
Supply support for LTC1298IN8#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 LTC1298IN8#PBF belongs to the LTC® micropower precision ADC family, designed specifically for ultra-low-power, space-constrained measurement applications where battery life and system integration are primary constraints.
FAQ
What is the maximum sampling rate of the LTC1298IN8#PBF?
The LTC1298IN8#PBF achieves a maximum sampling rate of 11.1 ksps under specified conditions (VCC = 5V, fCLK = 200 kHz). This rate is fixed by internal timing and cannot be exceeded without violating AC specifications such as DNL or SNR. At lower clock frequencies or reduced supply voltages, the achievable sampling rate decreases proportionally.
Does the LTC1298IN8#PBF require an external voltage reference?
No, the LTC1298IN8#PBF does not require an external voltage reference. Its reference input is internally tied to the VCC/VREF pin (Pin 8), meaning the full-scale range equals the supply voltage. This eliminates external reference components but fixes VFS to VCC, limiting flexibility in ratiometric or precision reference applications.
Can DIN and DOUT be connected to the same microcontroller pin for the LTC1298IN8#PBF?
Yes, DIN and DOUT can be tied together for 3-wire operation. The LTC1298IN8#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 configuration reduces pin count and simplifies isolation or routing in space-limited designs.
What is the operating temperature range of the LTC1298IN8#PBF?
The LTC1298IN8#PBF is rated for operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number. This industrial temperature range is validated across all electrical specifications including DNL, offset error, and supply current, ensuring reliable performance in demanding environments.
How does the LTC1298IN8#PBF achieve 1nA shutdown current?
The LTC1298IN8#PBF achieves 1nA shutdown current when CS/SHDN (Pin 1) is held high at VCC. In this state, internal bias circuits, comparator, and reference path are fully disabled. Leakage dominates the current draw, and clock or DIN activity has no effect - enabling true zero-power standby between measurements.
LTC1298IN8#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):
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1298IN8#PBF FAQ
1.How can I place an order for LTC1298IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1298IN8#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 LTC1298IN8#PBF reliable?
The price and inventory of LTC1298IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1298IN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1298IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1298IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1298IN8#PBF?
LTC1298IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1298IN8#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 LTC1298IN8#PBF?
For technical support, including LTC1298IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1298IN8#PBF requirements.
6.How does Aetrix verify that LTC1298IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1298IN8#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 LTC1298IN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1298IN8#PBF?
All LTC1298IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1298IN8#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 LTC1298IN8#PBF part is unused and in its original packaging.
Return procedure for LTC1298IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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