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Analog Devices Inc. LTC1198-1ACS8#PBF
- Part No.:
- LTC1198-1ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1198-1ACS8#PBF.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1198-1ACS8#PBF from Analog Devices (formerly Linear Technology) is an 8-bit, 750kHz sampling successive approximation ADC with integrated sample-and-hold and software-selectable 2-channel multiplexer. It operates from a single 3V–6V supply, consumes 50mW at 5V, and features auto-shutdown drawing only 1nA typical quiescent current when idle. Its SO-8 package, 3-wire serial interface, and ground-referenced or differential channel selection make it suitable for compact, battery-sensitive data acquisition in portable instrumentation.
For engineers reviewing the LTC1198-1ACS8#PBF datasheet, LTC1198-1ACS8#PBF pinout, LTC1198-1ACS8#PBF application, or LTC1198-1ACS8#PBF equivalent, key selection criteria include its 750kHz max sampling rate at 5V, ±1/2 LSB total unadjusted error over temperature, 2-channel MUX control via DIN, and shutdown behavior triggered by CS high - all critical for low-power, space-constrained embedded signal digitization.
Technical Context
The LTC1198-1ACS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold, supporting both single-ended and differential input configurations across two analog channels (CH0 and CH1). Its conversion sequence is initiated by a falling CS edge, followed by a START bit and 4-bit DIN word that configures MUX mode (single/differential) and sign/odd selection.
Timing is tightly coupled to external clock: conversion time is fixed at 710ns (LTC1198-1A grade), requiring minimum 12.0MHz clock for full-speed operation at 5V; digital outputs (DOUT) are synchronized to CLK rising edges, with DOUT valid 55ns after CLK↑ and entering Hi-Z 70ns after CS↑. The VCC/VREF pin serves dual function - power supply and reference - eliminating need for external reference in ratiometric applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit with no missing codes - guarantees monotonic transfer function for reliable control loop feedback. |
| Max Sampling Rate | 750kHz at VCC = 5V - enables real-time capture of signals up to ~375kHz Nyquist bandwidth. |
| Total Unadjusted Error | ±1/2 LSB over 0°C to 70°C - ensures absolute accuracy without calibration in industrial-grade systems. |
| Supply Current (Active) | 11mA at VCC = 5V, fSMPL = 750kHz - supports high-throughput acquisition while staying within 50mW power budget. |
| Supply Current (Shutdown) | 1μA typical - reduces system standby power to nanoamp level, critical for battery longevity in portable devices. |
| Input Voltage Range | 0V to VCC on CH0/CH1 - allows direct connection to sensors or op-amp outputs without level-shifting circuitry. |
| Serial Interface | 3-wire (CS, CLK, DOUT) + DIN - enables flexible MUX configuration with minimal GPIO usage on host MCU. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150°C max junction temperature, θJA = 175°C/W. RoHS-compliant lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS/SHUTDOWN | Chip Select / Power Control | Logic LOW enables conversion; logic HIGH forces auto-shutdown and disconnects internal power - no external enable circuit needed. |
| 2: CH0 | Analog Input Channel 0 | Primary single-ended input; used as inverting input in differential mode with CH1. |
| 3: CH1 | Analog Input Channel 1 | Secondary single-ended input; used as non-inverting input in differential mode with CH0. |
| 4: GND | Analog Ground Reference | Must connect directly to low-impedance analog ground plane to minimize noise coupling into sample-and-hold. |
| 5: DIN | Digital Input for MUX Control | Shifts in 4-bit command word (START + SGL/DIFF + ODD/SIGN + DUMMY) to configure channel and polarity before conversion. |
| 6: DOUT | Serial Data Output | MSB-first 8-bit result shifted out after conversion; enters Hi-Z state 70ns after CS↑ to prevent bus contention. |
| 7: CLK | Serial Clock Input | Drives internal timing; rising edge clocks DIN bits in and latches DOUT bits - requires stable 12MHz max at 5V. |
| 8: VCC/VREF | Power Supply & Reference | Serves as both 3V–6V supply and full-scale reference - simplifies layout but requires clean, bypassed rail. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Shutdown Mode | Reduces ICC to 1μA typical when CS = HIGH - eliminates need for external power-gating FET in sleep-state designs. |
| Software-Selectable 2-Channel MUX | Enables dynamic routing between CH0 and CH1 via 4-bit DIN command - supports multi-sensor polling without hardware reconfiguration. |
| Differential Input Capability | Allows CH0–CH1 measurement to reject common-mode noise - improves SNR in noisy industrial environments. |
| Single-Supply Operation (3V–6V) | Eliminates dual-rail supplies and level shifters - reduces BOM count and PCB area in portable and embedded systems. |
| Integrated Sample-and-Hold | Provides 1MHz full-accuracy input bandwidth - captures fast transients without external S/H circuitry. |
Applications
| Portable Instrumentation | Disk Drive Read Channel Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings with <1s update rate. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; samples at 100ksps to meet display latency requirements. Use Value: Auto-shutdown cuts average current to <10μA during idle intervals, extending AA battery life beyond 12 months. |
Use Scenario: Real-time monitoring of preamplifier output voltage and head positioning error in HDD servo loops. IC Role / Device Role / Timing Role: High-speed auxiliary ADC capturing analog feedback signals at 500kHz for closed-loop correction. Use Value: 750kHz sampling supports >200kHz closed-loop bandwidth, enabling tighter servo control and reduced track misregistration. |
| Low-Power Sensor Hub | Compact Industrial Data Logger |
|
Use Scenario: Battery-powered IoT node aggregating temperature, humidity, and vibration from three analog sensors. IC Role / Device Role / Timing Role: Time-multiplexed ADC scanning CH0 and CH1 sequentially; configured via DIN for differential thermocouple reads. Use Value: Single SO-8 device replaces discrete MUX + ADC solution, reducing footprint by 40% and eliminating inter-channel crosstalk. |
Use Scenario: DIN-rail mounted logger recording 4–20mA process signals from PLC I/O modules every 10ms. IC Role / Device Role / Timing Role: Ratiometric ADC using VCC/VREF to eliminate reference drift; samples at 100ksps with ±1/2 LSB TUE. Use Value: Total unadjusted error stability over 0°C–70°C avoids field recalibration, reducing maintenance cost and downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; 1MSPS; SPI-compatible 3-wire interface; no auto-shutdown; 8-pin MSOP package. | Lacks integrated shutdown mode - requires external enable control; higher 1.25mW active power at 3V. | Preferred when board space permits MSOP and host lacks dedicated CS-driven power management logic. |
| MAX1112CPE+ | 2.7V–5.25V supply; 100ksps; SPI interface; 16-pin PDIP package; includes internal reference. | Lower speed and larger package; internal reference adds 2mV/°C drift - unsuitable for precision ratiometric use. | Selected for legacy through-hole designs where reference integration outweighs speed and size penalties. |
Compared with ADS7822U and MAX1112CPE+, the LTC1198-1ACS8#PBF delivers superior power efficiency in intermittent acquisition scenarios due to its 1μA shutdown current and seamless CS-integrated power control - a decisive advantage in energy-constrained edge nodes.
Availability
LTC1198-1ACS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, disk drive monitoring, and compact industrial data loggers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1198-1ACS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1198 belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for space- and power-constrained embedded systems needing high-speed, low-power, easy-to-integrate ADC functionality.
FAQ
What is the maximum sampling rate of the LTC1198-1ACS8#PBF at 5V supply?
The LTC1198-1ACS8#PBF achieves a maximum sampling rate of 750kHz when operated at VCC = 5V and fCLK = 12.0MHz. This is specified for the -1A grade under recommended operating conditions and reflects the device's optimized timing for high-throughput acquisition without sacrificing DC accuracy.
How does the auto-shutdown feature of the LTC1198-1ACS8#PBF work?
The LTC1198-1ACS8#PBF enters auto-shutdown automatically when CS is driven HIGH, reducing supply current to 1μA typical. Unlike external enable schemes, this is fully internal - no additional control logic or power switches are required. The device resumes conversion within one clock cycle after CS falls LOW again.
Can the LTC1198-1ACS8#PBF perform differential measurements between CH0 and CH1?
Yes, the LTC1198-1ACS8#PBF supports differential input mode via the 4-bit DIN command word. When configured with SGL/DIFF = 0, it measures the voltage difference (CH1 – CH0), providing common-mode noise rejection and improved dynamic range for sensor interfaces like thermocouples or bridge amplifiers.
What is the total unadjusted error specification for the LTC1198-1ACS8#PBF over temperature?
The LTC1198-1ACS8#PBF is specified with ±1/2 LSB total unadjusted error over the full operating temperature range of 0°C to 70°C. This includes contributions from offset, full-scale, linearity, multiplexer, and hold-step errors - ensuring consistent absolute accuracy without system-level calibration.
Is an external reference required when using the LTC1198-1ACS8#PBF?
No, the LTC1198-1ACS8#PBF uses its VCC/VREF pin as both power supply and reference input, enabling true ratiometric operation. This eliminates external reference components and associated noise paths, provided the VCC rail is sufficiently clean and stable - typically achieved with 1μF ceramic + 10μF tantalum bypassing at the pin.
LTC1198-1ACS8#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:
- 8
- Sampling Rate (Per Second):
- 750k
- 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:
- 2.7V ~ 6V
- Voltage - Supply, Digital:
- 2.7V ~ 6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1198-1ACS8#PBF FAQ
1.How can I place an order for LTC1198-1ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1198-1ACS8#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 LTC1198-1ACS8#PBF reliable?
The price and inventory of LTC1198-1ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1198-1ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1198-1ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1198-1ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1198-1ACS8#PBF?
LTC1198-1ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1198-1ACS8#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 LTC1198-1ACS8#PBF?
For technical support, including LTC1198-1ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1198-1ACS8#PBF requirements.
6.How does Aetrix verify that LTC1198-1ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1198-1ACS8#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 LTC1198-1ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1198-1ACS8#PBF?
All LTC1198-1ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1198-1ACS8#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 LTC1198-1ACS8#PBF part is unused and in its original packaging.
Return procedure for LTC1198-1ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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