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Analog Devices Inc. LTC1098ACS8#PBF
- Part No.:
- LTC1098ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1098ACS8#PBF.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,780
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Product details
Overview
LTC1098ACS8#PBF from Analog Devices (formerly Linear Technology) is a micropower 8-bit successive approximation analog-to-digital converter with integrated sample-and-hold and software-selectable dual-channel multiplexer. It operates from 3V to 6V supply, draws only 88μA typical active current at 500kHz clock, achieves ±0.5LSB total unadjusted error over temperature, and supports up to 33kHz sampling rate. It is used in battery-powered remote sensing nodes where low quiescent power and direct sensor interfacing are critical.
For engineers reviewing the LTC1098ACS8#PBF datasheet, LTC1098ACS8#PBF pinout, LTC1098ACS8#PBF application, or LTC1098ACS8#PBF equivalent, key selection criteria include its 2-channel MUX capability, 3-wire serial interface compatibility with microcontrollers, shutdown current of 1nA, SO-8 package footprint, and ratiometric operation with external or internal VCC-referenced conversion.
Technical Context
The LTC1098ACS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold, enabling accurate DC and low-frequency AC signal digitization without external hold circuitry. Its dual-channel MUX allows dynamic selection between CH0 and CH1 inputs via serial DIN command before conversion initiation.
It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT) with data valid on CLK falling edge and wake-up timing tightly coupled to CS assertion-requiring 10μs minimum delay from CS↓ to first MSBF CLK↓ at 5V operation. Conversion completes in exactly 8 clock cycles with 16μs typical time at 500kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit with no missing codes-guarantees monotonic transfer function for control-loop feedback. |
| Supply Current (Active) | 88μA typical at 500kHz clock-enables >1-year operation on a single CR2032 in intermittent-sampling systems. |
| Supply Current (Shutdown) | 1nA typical-reduces system standby power to negligible levels in always-on monitoring applications. |
| Sampling Rate | 33kHz maximum-supports anti-aliasing filtering for signals up to ~12kHz with adequate guard band. |
| Total Unadjusted Error | ±0.5LSB over full temperature range-eliminates need for system-level calibration in 12-bit-equivalent precision applications. |
| Input Voltage Range | –0.05V to VCC + 0.05V-allows direct connection to sensors operating near rail without level-shifting. |
| Conversion Time | 16μs at 500kHz-enables deterministic timing for real-time interrupt-driven firmware handling. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 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; high state powers down entire ADC core to 1nA leakage-critical for duty-cycled acquisition. |
| 2: CH0 | Analog Input Channel 0 | High-impedance input (25pF on-channel); accepts 0V to VCC+0.05V-directly interfaces thermistors or voltage dividers. |
| 3: CH1 | Analog Input Channel 1 | Independent high-Z input identical to CH0; selected via DIN bitstream prior to conversion start. |
| 4: GND | Analog Ground Reference | Must connect directly to low-noise analog ground plane-separate from digital ground to prevent noise coupling into conversion. |
| 5: DIN | Serial Data Input | Accepts 1-bit MUX address (CH0=0, CH1=1) on rising CLK edges; enables channel selection without additional GPIO. |
| 6: DOUT | Serial Data Output | Outputs 8-bit result MSB-first on falling CLK edges; tri-states when CS is high-supports shared bus topology. |
| 7: CLK | Serial Shift Clock | Synchronizes all data transfers; min/max frequency defined per supply voltage (25–500kHz at 5V). |
| 8: VCC (VREF) | Power Supply / Reference Input | Single-pin dual-function: supplies core logic and defines full-scale range-enables ratiometric measurement with resistive sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Reduces BOM count and PCB area vs discrete channel switching; eliminates external analog switches and associated leakage errors. |
| 1nA shutdown current | Enables multi-year battery life in wireless sensor nodes with <1s/hour wake-up intervals-verified across –40°C to 85°C. |
| Ratiometric operation with VCC-referenced conversion | Removes need for precision external reference; maintains accuracy despite battery voltage sag in portable instruments. |
| Integrated sample-and-hold | Eliminates external S/H IC and associated layout complexity; guarantees consistent aperture time across channels and temperatures. |
| 3V to 6V single-supply operation | Supports direct integration into 3.3V and 5V microcontroller systems without level translation-reduces component count. |
Applications
| Battery Monitoring | Temperature Measurement |
|---|---|
Use Scenario: Real-time monitoring of Li-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Dual-channel ADC samples cell voltage (CH0) and pack temperature (CH1) alternately every 500ms using software MUX control. Use Value: 88μA active current extends battery runtime by >30% vs comparable 10-bit converters; ratiometric mode compensates for supply droop during high-current pulses. |
Use Scenario: Ambient and heatsink temperature tracking in industrial motor drives with isolated microcontroller communication. IC Role / Device Role / Timing Role: Converts thermistor voltage (CH0) and RTD bridge output (CH1) sequentially, with data transmitted across opto-isolator via 3-wire serial interface. Use Value: 1nA shutdown current prevents thermal drift during idle periods; ±0.5LSB TUE ensures <0.5°C absolute accuracy without factory calibration. |
| Remote Data Acquisition | Isolated Data Acquisition |
Use Scenario: Solar-powered environmental sensor node measuring light intensity and humidity in agricultural IoT deployments. IC Role / Device Role / Timing Role: Samples photodiode current (CH0) and capacitive humidity sensor (CH1) every 10 seconds, then enters 1nA shutdown until next cycle. Use Value: Micropower design enables >2-year field deployment on 10,000mAh LiFePO₄; SO-8 package simplifies conformal coating for outdoor reliability. |
Use Scenario: High-voltage grid monitoring where ADC must digitize CT/PT outputs while maintaining 4kV isolation from MCU side. IC Role / Device Role / Timing Role: Digitizes isolated analog signals on primary side; serial data transferred across transformer-coupled barrier using precise 16μs conversion window. Use Value: Deterministic 16μs conversion time enables tight timing margins in isolated gate drivers; 3-wire interface minimizes transformer winding count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit micropower ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; SPI-compatible 3-wire interface; 1μA shutdown current; no integrated MUX. | Requires external analog switch for dual-channel use; better suited for single-input high-speed sampling (>50ksps). | Select when higher sampling rate (up to 200ksps) is needed and external MUX is acceptable. |
| MAX1110EUA+ | 2.7–3.6V only; I²C interface; 1.5μA shutdown; integrated temp sensor; no MUX. | Limited to 3.3V systems; lacks channel selection flexibility; adds built-in temperature compensation. | Select for compact 3.3V designs needing on-chip temperature reference but not dual analog inputs. |
Compared with ADS7822U and MAX1110EUA+, the LTC1098ACS8#PBF uniquely combines dual-channel software MUX, 1nA shutdown, and VCC-referenced ratiometric operation in an SO-8 package-making it optimal for ultra-low-power, multi-sensor battery systems where board space and BOM count are constrained.
Availability
LTC1098ACS8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply and long-term lifecycle support.
Supply support for LTC1098ACS8#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and power management.
The LTC1098 series belongs to Linear's micropower precision ADC product line, designed specifically for energy-constrained applications including portable medical devices, wireless sensors, and battery-backed monitoring systems where sub-100μA active current and nanoscale shutdown are mandatory.
FAQ
What is the maximum clock frequency supported by LTC1098ACS8#PBF at 5V operation?
The LTC1098ACS8#PBF supports a maximum clock frequency of 500kHz when operated at VCC = 5V. This enables a 33kHz sampling rate with guaranteed timing margins and ±0.5LSB total unadjusted error across the full temperature range. Exceeding 500kHz may degrade accuracy due to insufficient internal settling time.
Does LTC1098ACS8#PBF require an external voltage reference?
No, the LTC1098ACS8#PBF does not require an external voltage reference. Pin 8 (VCC/VREF) serves as both power supply and reference input, enabling ratiometric operation. When VCC = 5V, full-scale range is 0V to 5.05V; this eliminates reference drift errors and simplifies design for battery-powered systems.
How does the software-selectable MUX in LTC1098ACS8#PBF work?
The LTC1098ACS8#PBF uses DIN (Pin 5) to accept a 1-bit address before conversion: logic '0' selects CH0, logic '1' selects CH1. The MUX is controlled entirely via serial command-no external pins or configuration registers are needed. Channel selection occurs during the CS-active period prior to CLK initiation.
What is the wake-up time requirement for LTC1098ACS8#PBF after CS assertion?
The LTC1098ACS8#PBF requires a minimum 10μs delay from CS falling edge to the falling edge of the first CLK pulse that clocks the MSB bit. This wake-up time ensures internal biasing and capacitor settling. At clock frequencies ≤100kHz, this delay is inherently satisfied by the clock period and no additional timing margin is needed.
Can LTC1098ACS8#PBF operate from a 3.3V supply?
Yes, the LTC1098ACS8#PBF is fully specified for 3V to 6V operation. At VCC = 3.3V, it supports up to 250kHz clock frequency and delivers 16.5kHz maximum sampling rate with ±1.0LSB total unadjusted error. Its 3.3V compatibility enables seamless integration with modern low-voltage microcontrollers without level-shifting circuitry.
LTC1098ACS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 33k
- Number of Inputs:
- 1, 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3V ~ 6V
- Voltage - Supply, Digital:
- 3V ~ 6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1098ACS8#PBF FAQ
1.How can I place an order for LTC1098ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1098ACS8#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 LTC1098ACS8#PBF reliable?
The price and inventory of LTC1098ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1098ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1098ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1098ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1098ACS8#PBF?
LTC1098ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1098ACS8#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 LTC1098ACS8#PBF?
For technical support, including LTC1098ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1098ACS8#PBF requirements.
6.How does Aetrix verify that LTC1098ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1098ACS8#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 LTC1098ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1098ACS8#PBF?
All LTC1098ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1098ACS8#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 LTC1098ACS8#PBF part is unused and in its original packaging.
Return procedure for LTC1098ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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