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Analog Devices Inc. LTC1298CS8#PBF
- Part No.:
- LTC1298CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1298CS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:592
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Product details
Overview
LTC1298CS8#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 single 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 LTC1298CS8#PBF datasheet, LTC1298CS8#PBF pinout, LTC1298CS8#PBF application, or LTC1298CS8#PBF equivalent, key selection considerations include its 2-channel MUX architecture, 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 LTC1298CS8#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 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 8). Conversion timing is clock-driven: tCONV = 12 CLK cycles, tCYC = 90µs at 200kHz, and full-scale range is 0V to VCC with ±1µA analog input leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision sensor digitization. |
| Sampling Rate | 11.1 ksps maximum - enables real-time monitoring of slow-varying industrial or environmental signals. |
| Supply Current | 360µA typ. at 11.1 ksps; drops to 1nA in shutdown - extends battery life in portable instrumentation. |
| Differential Nonlinearity | ±3/4 LSB max - ensures accurate code transitions across full 4096-code range without code-width anomalies. |
| Conversion Time | 60µs (12 CLK cycles @ 200kHz) - defines minimum inter-sample interval for deterministic timing control. |
| Analog Input Range | 0V to VCC (4.5V–5.5V) - allows direct connection to unbuffered sensors without external level-shifting. |
| Reference Configuration | Internal tie of VCC to VREF pin - eliminates need for external reference but binds full-scale to supply voltage. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant.
| 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), eliminating need for external power gating. |
| 2: CH0 | Analog Input Channel 0 | Primary single-ended or differential input; high-impedance node (20pF) suitable for direct transducer connection. |
| 3: CH1 | Analog Input Channel 1 | Secondary input for MUX selection; supports differential mode (CH0–CH1) or independent single-ended sensing. |
| 4: GND | Analog Ground Reference | Must connect directly to low-noise analog ground plane; separates analog return path from digital noise sources. |
| 5: DIN | Serial Data Input | Receives 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 MSB-first after one null bit; supports tri-state when CS high. |
| 7: CLK | Serial Interface Clock | Synchronizes all data transfers; max 200kHz at 5V; timing-critical for setup/hold compliance (tsuDI = 400ns, thDI = 150ns). |
| 8: VCC/VREF | Power Supply & Reference Voltage | Single-pin dual function: powers internal circuitry and sets full-scale range; requires local 4.7µF bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown to 1nA | Eliminates external power sequencing; enables true zero-power sleep between conversions in energy-harvesting nodes. |
| Software-configurable 2-channel MUX | Allows dynamic selection of input topology (single-ended/differential) and channel pair without hardware change. |
| On-chip sample-and-hold | Removes need for external S/H circuitry; supports accurate sampling of high-impedance sources up to 10kΩ source resistance. |
| I/O compatibility with SPI/Microwire | Reduces firmware development effort-uses standard microcontroller serial peripheral libraries without custom bit-banging. |
| Guaranteed ±3/4 LSB DNL | Ensures monotonicity and predictable error bounds for closed-loop control applications requiring consistent step response. |
Applications
| Battery Monitoring | Remote Temperature Sensing |
|---|---|
Use Scenario: Measuring cell voltage and pack current in lithium-ion battery management systems deployed in handheld medical devices. IC Role / Device Role / Timing Role: ADC digitizes voltage across sense resistor and cell terminals; MUX alternates between channels at 10ksps for synchronized sampling. Use Value: Micropower operation extends runtime between charges; ±3/4 LSB DNL ensures accurate state-of-charge estimation over full temperature range. | Use Scenario: Distributed environmental monitoring using thermistor or RTD sensors in wireless sensor networks powered by coin-cell batteries. IC Role / Device Role / Timing Role: Configured for differential thermistor bridge readout (CH0–CH1); auto-shutdown minimizes quiescent current during 1-second sampling intervals. Use Value: Direct 0–5V input range eliminates op-amp signal conditioning; 12-bit resolution delivers <0.1°C temperature accuracy with NTC thermistors. |
| Isolated Data Acquisition | Handheld Terminal Interface |
Use Scenario: Industrial field transmitter with galvanic isolation, acquiring 4–20mA loop signals and local sensor inputs behind optocouplers or digital isolators. IC Role / Device Role / Timing Role: Acts as isolated-side ADC; serial interface crosses barrier using 3-wire configuration (CS, CLK, DIN/DOUT tied) to minimize isolator channel count. Use Value: 4-wire SPI compatibility simplifies isolated communication protocol; low supply current reduces isolated power budget constraints. | Use Scenario: Barcode scanner or RFID reader with integrated analog front-end for button press detection, battery voltage feedback, and ambient light sensing. IC Role / Device Role / Timing Role: Multiplexes between pushbutton analog threshold detection (CH0), battery monitor (CH1), and photodiode signal (CH0 in differential mode). Use Value: Single SOIC-8 footprint consolidates multiple analog measurements; 11.1 ksps sampling supports responsive UI feedback without MCU resource overhead. |
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, 200ksps, 3.3V-only supply, internal reference, no MUX | Higher speed but fixed single-ended input; lacks software-selectable differential mode and 2-channel switching | Select when higher throughput and internal reference stability outweigh need for dual-channel flexibility. |
| MAX1113EUA+ | 8-pin µMAX, 12-bit, 100ksps, 2.7–3.6V supply, internal reference, no MUX | Smaller package and lower voltage operation, but no analog multiplexer and incompatible serial framing | Prefer for ultra-compact 3.3V systems where channel count is fixed and board space is critical. |
Compared with ADS7822U and MAX1113EUA+, the LTC1298CS8#PBF uniquely combines 2-channel software-selectable MUX, 4.5–5.5V operation, and sub-µA shutdown in an industry-standard SOIC-8-making it optimal for multi-sensor battery-powered nodes requiring flexible analog routing without layout redesign.
Availability
LTC1298CS8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and handheld terminal interface requiring stable component supply and long-term manufacturability.
Supply support for LTC1298CS8#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 LTC1298CS8#PBF belongs to the LTC® micropower precision ADC family, designed specifically for ultra-low-power sensor interfacing in portable and remotely deployed instrumentation where energy efficiency and small footprint are primary constraints.
FAQ
What is the maximum clock frequency supported by the LTC1298CS8#PBF?
The LTC1298CS8#PBF supports a maximum clock frequency of 200kHz when operating from a 5V supply. At this rate, total cycle time is 90µs and conversion completes in 12 clock cycles (60µs). Clock frequency must be reduced for supplies above 5.5V per the manufacturer's typical performance curves; exceeding 200kHz risks timing violations and degraded DNL performance in the LTC1298CS8#PBF.
Does the LTC1298CS8#PBF require an external reference voltage?
No, the LTC1298CS8#PBF does not require an external reference. Its VCC/VREF pin (Pin 8) serves as both power supply and reference input, tying the full-scale range directly to the supply voltage. This eliminates external reference components but means full-scale accuracy tracks VCC tolerance and drift; the LTC1298CS8#PBF is not suitable for applications requiring ratiometric independence from supply variation.
How does the LTC1298CS8#PBF handle differential versus single-ended input configurations?
The LTC1298CS8#PBF selects input mode via the 3-bit DIN word: the SGL/DIFF bit determines whether CH0 and CH1 are interpreted as single-ended (vs GND) or differential (CH0–CH1). In differential mode, the ODD/SIGN bit further selects polarity (CH0–CH1 or CH1–CH0). This configuration occurs per conversion, enabling dynamic reconfiguration without hardware changes in the LTC1298CS8#PBF.
Can DIN and DOUT be tied together for 3-wire interface with the LTC1298CS8#PBF?
Yes, DIN and DOUT can be tied together for a 3-wire interface (CS, CLK, DATA) with the LTC1298CS8#PBF. The device drives the line low on the 4th falling CLK edge after the start bit, so the host MCU must release the line as an input before that edge. This configuration reduces PCB routing complexity and is validated in the LTC1298CS8#PBF datasheet for Intel 8051 and similar controllers.
What is the guaranteed integral linearity error for the LTC1298CS8#PBF?
The LTC1298CS8#PBF guarantees ±2 LSB maximum integral linearity error (INL) over the full operating temperature range (–40°C to +85°C). This specification ensures end-point accuracy for calibration-sensitive applications such as precision sensor measurement and closed-loop control where absolute voltage accuracy matters more than relative step consistency.
LTC1298CS8#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1298CS8#PBF FAQ
1.How can I place an order for LTC1298CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1298CS8#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 LTC1298CS8#PBF reliable?
The price and inventory of LTC1298CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1298CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1298CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1298CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1298CS8#PBF?
LTC1298CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1298CS8#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 LTC1298CS8#PBF?
For technical support, including LTC1298CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1298CS8#PBF requirements.
6.How does Aetrix verify that LTC1298CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1298CS8#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 LTC1298CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1298CS8#PBF?
All LTC1298CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1298CS8#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 LTC1298CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1298CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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