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Analog Devices Inc. LTC1298IS8#TRPBF
- Part No.:
- LTC1298IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1298IS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
LTC1298IS8#TRPBF 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 auto-shuts down to 1nA when idle. It interfaces via SPI/Microwire-compatible 4-wire serial interface and targets battery-powered remote data acquisition systems.
For engineers reviewing the LTC1298IS8#TRPBF datasheet, LTC1298IS8#TRPBF pinout, LTC1298IS8#TRPBF application, or LTC1298IS8#TRPBF equivalent, key selection criteria include its 2-channel MUX capability, guaranteed ±3/4 LSB DNL, 60µs conversion time, differential or single-ended input configuration, and SOIC-8 package compatibility with space-constrained embedded sensor nodes.
Technical Context
The LTC1298IS8#TRPBF 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 configuration word (SGL/DIFF, ODD/SIGN, MSBF) before outputting the 12-bit result MSB-first.
It supports both single-ended (CH0–GND or CH1–GND) and differential (CH0–CH1 or CH1–CH0) measurement modes, with reference tied internally to VCC/VREF pin. Conversion timing is clock-synchronized: tCONV = 12 CLK cycles, tCYC = 90µs at 200kHz clock, and tSMPL = 1.5 CLK cycles for analog acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonic transfer function for precision control loops. |
| Sampling Rate | 11.1 ksps maximum - supports real-time monitoring of slow-varying industrial sensor signals. |
| Differential Nonlinearity | ±3/4 LSB max - guarantees monotonicity and enables accurate linear interpolation in calibration routines. |
| Supply Current | 360 µA typ. at full rate; drops to 1 nA in shutdown - enables multi-year operation on coin-cell batteries. |
| Conversion Time | 60 µs - allows tight timing control in synchronized data acquisition systems with external triggers. |
| Analog Input Range | 0V to VCC/VREF (up to 5.5V) - permits direct connection to 3.3V or 5V sensors without level-shifting. |
| Reference Configuration | Internal tie to VCC/VREF pin - eliminates need for external reference component, reducing BOM count and layout area. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS/SHDN (Pin 1) | Chip Select / Shutdown Control | Active-low enable; logic high forces full shutdown (1nA ICC), enabling ultra-low-power sleep states. |
| CH0 (Pin 2) | Analog Input Channel 0 | Positive input for single-ended or differential mode; high-impedance (>5 MΩ) minimizes loading on resistive sensors. |
| CH1 (Pin 3) | Analog Input Channel 1 | Second analog input; selectable as negative terminal in differential mode or independent single-ended channel. |
| GND (Pin 4) | Analog Ground Reference | Must connect directly to low-noise analog ground plane to maintain 71 dB SNR and prevent digital coupling. |
| DIN (Pin 5) | Serial Data Input | Receives 3-bit MUX configuration word (start bit + SGL/DIFF, ODD/SIGN, MSBF); sampled on rising CLK edge. |
| DOUT (Pin 6) | Serial Data Output | Outputs 12-bit conversion result MSB-first after one null bit; tri-state when CS high. |
| CLK (Pin 7) | Serial Clock Input | Synchronizes all data transfers; supports up to 200 kHz clock for 11.1 ksps operation at 5V supply. |
| VCC/VREF (Pin 8) | Power Supply & Reference Voltage | Single-pin dual function: powers internal circuitry and defines full-scale range (0V to VCC); bypass with 4.7µF capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software-Selectable MUX | Enables dual-sensor monitoring (e.g., temperature + voltage) with single ADC, reducing system component count and PCB area. |
| Auto Shutdown to 1nA | Eliminates need for external power-gating circuitry; ideal for wake-on-event architectures in IoT endpoints. |
| Guaranteed ±3/4 LSB DNL | Ensures monotonic behavior across full temperature range (–40°C to +85°C), critical for closed-loop feedback stability. |
| I/O Compatibility with SPI/Microwire | Supports direct interfacing with common microcontrollers (e.g., STM32, MSP430) without protocol translation logic. |
| On-Chip Sample-and-Hold | Removes need for external S/H amplifier; maintains 12-bit accuracy for signals up to 1 kHz bandwidth. |
| Single-Supply 4.5V–5.5V Operation | Matches standard logic rail voltages, simplifying power design and eliminating dual-supply sequencing requirements. |
Applications
| Battery Monitoring | Temperature Measurement |
|---|---|
|
Use Scenario: Measuring cell voltage and pack current in portable medical devices or wearables using two separate resistive dividers or shunt amplifiers. IC Role / Device Role / Timing Role: Dual-channel ADC samples voltage and current simultaneously or alternately; 11.1 ksps rate captures transient load events. Use Value: 12-bit resolution enables <10mV voltage resolution at 5V full scale, supporting precise state-of-charge estimation over battery lifetime. |
Use Scenario: Reading thermistor or RTD outputs in HVAC controllers or industrial process sensors with ambient temperature compensation. IC Role / Device Role / Timing Role: Configured for single-ended CH0 and CH1 reads to acquire sensor and reference junction temperatures in sequence. Use Value: ±3/4 LSB DNL ensures linearity across –40°C to +85°C, enabling accurate polynomial curve-fitting without per-unit calibration. |
| Remote Data Acquisition | Isolated Data Acquisition |
|
Use Scenario: Low-power sensor node collecting vibration, pressure, and humidity data in oil/gas field equipment powered by solar + LiSOCl₂ battery. IC Role / Device Role / Timing Role: ADC operates in burst mode-awakened by MCU, converts two channels, shuts down-minimizing average current draw. Use Value: 1nA shutdown current extends 10-year battery life; SOIC-8 footprint fits compact enclosure with RF module and energy harvester. |
Use Scenario: Signal conditioning stage downstream of digital isolators (e.g., ADuM5401) in motor drive current sensing where ground separation is mandatory. IC Role / Device Role / Timing Role: Receives isolated clock and CS signals; outputs serial data back across isolation barrier via optocoupler or capacitive isolator. Use Value: 3-wire interface (CS, CLK, DIN/DOUT shared) reduces isolator channel count, lowering cost and propagation delay vs parallel ADCs. |
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-bit resolution, 200 ksps, SPI interface, 2.7–5.25V supply; no internal MUX or auto-shutdown. | Higher speed but lower resolution; lacks micropower shutdown and dual-channel flexibility. | Choose only if >100 ksps sampling is required and 8-bit accuracy suffices for cost-sensitive consumer applications. |
| MCP3202-I/P | 12-bit, dual-channel, SPI, 2.7–5.5V; 500 µA active current, no auto-shutdown, DIP-8 package. | Higher supply current prevents long-life battery use; through-hole package incompatible with automated SMT assembly. | Select when legacy through-hole prototyping is needed and shutdown current is not critical; avoid for production IoT designs. |
Compared with ADS7822U and MCP3202-I/P, the LTC1298IS8#TRPBF uniquely combines 12-bit precision, 2-channel MUX, sub-µA shutdown, and SOIC-8 packaging-making it the only option suitable for production-grade, battery-operated, space-constrained sensor nodes requiring guaranteed monotonicity and minimal BOM count.
Availability
LTC1298IS8#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, remote data acquisition, and isolated sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC1298IS8#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC1298IS8#TRPBF belongs to the LTC® micropower precision ADC family, designed specifically for ultra-low-power, high-accuracy data acquisition in resource-constrained embedded systems where battery life and measurement fidelity are co-primary constraints.
FAQ
What is the maximum sampling rate of the LTC1298IS8#TRPBF?
The LTC1298IS8#TRPBF achieves a maximum sampling rate of 11.1 ksps under specified conditions (VCC = 5V, fCLK = 200 kHz). This rate is fixed by internal timing architecture and cannot be exceeded without violating AC specifications such as SNR or DNL. At lower clock frequencies, the sampling rate scales linearly-for example, at 100 kHz clock, maximum rate is ~5.55 ksps.
Does the LTC1298IS8#TRPBF require an external reference voltage?
No, the LTC1298IS8#TRPBF does not require an external reference. Its VCC/VREF pin serves as both power supply and reference source, establishing the full-scale input range from 0V to VCC. This eliminates external reference components and associated noise paths, simplifying design for cost- and space-sensitive applications.
Can the LTC1298IS8#TRPBF operate from a 3.3V supply?
No, the LTC1298IS8#TRPBF is specified for 4.5V to 5.5V operation only. Attempting to power it from 3.3V violates absolute maximum ratings and will result in undefined behavior, including failure to sample, incorrect code output, or permanent damage. For 3.3V systems, consider the pin-compatible LTC1298CS8 or alternate families like the LTC2305.
How does the LTC1298IS8#TRPBF handle differential input measurements?
The LTC1298IS8#TRPBF supports differential measurements between CH0 and CH1 via software configuration. When the SGL/DIFF bit is set to '0', the device measures CH0–CH1 or CH1–CH0 depending on the ODD/SIGN bit. This mode provides rejection of common-mode noise and enables precise measurement of small signals superimposed on large DC offsets.
What is the purpose of the DIN pin on the LTC1298IS8#TRPBF?
The DIN pin on the LTC1298IS8#TRPBF receives a 3-bit configuration word (start bit + SGL/DIFF, ODD/SIGN, MSBF) that selects input channel, measurement mode, and data format. This command is shifted in on rising CLK edges immediately after CS goes low and determines how the subsequent 12-bit conversion result is interpreted and output on DOUT.
LTC1298IS8#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1298IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1298IS8#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 LTC1298IS8#TRPBF reliable?
The price and inventory of LTC1298IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1298IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1298IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1298IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1298IS8#TRPBF?
LTC1298IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1298IS8#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 LTC1298IS8#TRPBF?
For technical support, including LTC1298IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1298IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1298IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1298IS8#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 LTC1298IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1298IS8#TRPBF?
All LTC1298IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1298IS8#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 LTC1298IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1298IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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