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Analog Devices Inc. LTC1197LCMS8#PBF
- Part No.:
- LTC1197LCMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1197LCMS8#PBF.pdf
- Description:
- IC ADC 10BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
LTC1197LCMS8#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, internal sample-and-hold, and auto shutdown. It operates from a single 2.7V supply, draws only 0.8mA at full speed, supports 2.5V external reference, and delivers ±1 LSB linearity over –40°C to 85°C. It is used in portable data loggers for precision sensor digitization.
For engineers reviewing the LTC1197LCMS8#PBF datasheet, LTC1197LCMS8#PBF pinout, LTC1197LCMS8#PBF application, or LTC1197LCMS8#PBF equivalent, key selection criteria include its 2.7V operation, differential input architecture, 250ksps sampling rate, MSOP-8 package, and SPI/MICROWIRE-compatible 3-wire serial interface.
Technical Context
The LTC1197LCMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and programmable reference input. Its differential input accepts signals from 0V to VCC with common-mode rejection, enabling direct connection to bridge sensors and instrumentation amplifiers without level-shifting.
Auto shutdown reduces supply current linearly with sampling frequency - from 0.8mA at 250ksps down to sub-µA standby - while maintaining full 10-bit resolution and monotonicity across temperature. The 3-wire serial interface uses CS/CLK/DOUT with MSB-first output and no DIN pin, distinguishing it from the MUX-equipped LTC1199L family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, guaranteed no missing codes across operating range |
| Max Sampling Rate | 250ksps at VCC = 2.7V, fCLK = 3.5MHz - enables real-time monitoring of audio-band and industrial control signals |
| Supply Voltage | 2.7V to 4V - compatible with Li-ion single-cell and low-voltage embedded rails |
| Reference Input | External 0.2V to VCC + 0.05V - supports ratiometric sensing and sub-1V spans (e.g., 200mV full-scale = 200µV LSB) |
| INL / DNL | ±1 LSB / ±1 LSB - ensures accurate amplitude fidelity in closed-loop control and calibration-critical systems |
| Power Dissipation | 2.2mW typical at 250ksps - allows continuous high-speed acquisition in thermally constrained handheld devices |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Active-low enable; high state triggers auto shutdown and places DOUT in Hi-Z |
| 2 +IN | Differential Analog Input (+) | High-impedance input (20pF); accepts 0V to VCC range; requires low-noise source coupling |
| 3 –IN | Differential Analog Input (–) | High-impedance input (20pF); defines common-mode voltage; must remain stable during conversion |
| 4 GND | Analog Ground | Must connect directly to low-impedance analog ground plane; separates analog/digital return paths |
| 5 VREF | Reference Input | Accepts external 0.2V–2.75V reference; sets full-scale range; bypass with 1µF ceramic capacitor |
| 6 DOUT | Serial Data Output | 3-wire SPI/MICROWIRE-compatible; outputs 10-bit result MSB-first after two null bits; Hi-Z when CS high |
| 7 CLK | Serial Clock Input | Accepts 0.01–3.5MHz clock; rising edge synchronizes data capture and output timing |
| 8 VCC | Positive Supply | 2.7V–4V single supply; requires local 0.1µF ceramic bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| Differential input architecture | Enables rejection of common-mode noise up to 100dB in bridge-based sensor interfaces |
| Auto shutdown power scaling | Reduces ICC linearly from 0.8mA @ 250ksps to <1µA @ 1ksps - eliminates need for external sleep control logic |
| 2.7V operation with 2.5V reference | Supports precise ratiometric measurement using same battery as reference source (e.g., resistive divider from VCC) |
| Guaranteed monotonicity | Ensures stable feedback in closed-loop systems like PID controllers without code transitions causing instability |
| MSOP-8 thermal performance | θJA = 210°C/W enables sustained 250ksps operation in compact PCB layouts without heatsinking |
Applications
| Portable ECG Monitor | Industrial Temperature Logger |
|---|---|
Use Scenario: Digitizing low-amplitude, high-impedance biopotential signals from dry electrodes with minimal front-end gain. IC Role / Device Role / Timing Role: Precision 10-bit ADC capturing 250ksps waveform data with differential input rejecting 50/60Hz mains interference. Use Value: 2.7V operation extends battery life; ±1 LSB INL preserves diagnostic accuracy; MSOP-8 footprint saves board space in wearable form factor. |
Use Scenario: Measuring thermistor or RTD voltage outputs in remote environmental nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power SAR ADC sampling sensor bridges at 1ksps, entering auto shutdown between readings. Use Value: Sub-µA standby current enables multi-year deployment; 200mV span support allows direct thermistor readout without op-amp gain stage. |
| Automotive Cabin Pressure Sensor | Smart Energy Meter Current Channel |
Use Scenario: Converting piezoresistive pressure transducer output in automotive HVAC modules exposed to –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing to signal-conditioned analog output, operating across full industrial temperature range. Use Value: Guaranteed ±1 LSB linearity and –40°C to +85°C qualification ensure consistent calibration stability; 2.7V compatibility matches vehicle battery brownout conditions. |
Use Scenario: Digitizing isolated current-sense amplifier outputs in Class 0.5 energy meters requiring metrology-grade linearity. IC Role / Device Role / Timing Role: Differential-input ADC rejecting common-mode noise from shunt-based current sensing in noisy AC environments. Use Value: 100dB CMRR capability minimizes error from switching power supplies; ±1 LSB DNL prevents harmonic distortion in FFT-based power analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC only; 200ksps max; 2.7V–5.25V supply; no auto shutdown | Requires external power management for low-duty-cycle use; lower sampling rate limits dynamic signal capture | Select when legacy SOIC layout exists and auto shutdown is not required |
| MAX11100ETE+ | 10-bit, 500ksps, 2.7V–3.6V; SPI-only interface; no differential input - single-ended only | Lacks differential input, limiting noise immunity in unshielded industrial wiring; higher speed but less flexible analog interface | Select when single-ended inputs suffice and higher throughput is prioritized over common-mode rejection |
Compared with ADS7822U and MAX11100ETE+, the LTC1197LCMS8#PBF uniquely combines differential input, auto shutdown, and MSOP-8 packaging - making it optimal for space-constrained, battery-powered systems requiring robust analog front-end performance.
Availability
LTC1197LCMS8#PBF is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, and automotive cabin sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC1197LCMS8#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 LTC1197LCMS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for ultra-low-power, high-resolution digitization in battery-operated and thermally constrained systems.
FAQ
What is the maximum clock frequency supported by the LTC1197LCMS8#PBF?
The LTC1197LCMS8#PBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This corresponds to its rated 250ksps sampling rate. Exceeding 3.5MHz may cause timing violations or degraded INL/DNL performance, as confirmed in the Recommended Operating Conditions table. The device's tCYC (total cycle time) is specified at 14–16 clock cycles, requiring strict adherence to this timing budget.
Does the LTC1197LCMS8#PBF require an external reference voltage?
Yes, the LTC1197LCMS8#PBF requires an external reference voltage applied to the VREF pin. It accepts 0.2V to VCC + 0.05V (up to 2.75V at VCC = 2.7V), enabling flexible ratiometric or precision reference configurations. Unlike the LTC1199L series, it does not tie VREF internally to VCC - making external reference mandatory for accurate full-scale definition.
Can the LTC1197LCMS8#PBF interface directly with a microcontroller GPIO without level-shifting?
Yes, the LTC1197LCMS8#PBF is fully compatible with 2.7V–3.3V microcontrollers. Its VIH is 1.9V (min) and VIL is 0.45V (max) at VCC = 2.7V, ensuring reliable logic-level recognition from standard 3.3V or 2.7V I/Os. No level-shifting is needed when interfacing with MSP430, STM32L, or nRF52-series MCUs operating in the same voltage domain.
What is the analog input impedance of the LTC1197LCMS8#PBF?
The LTC1197LCMS8#PBF features high-impedance analog inputs: 20pF capacitance on active channel (+IN or –IN), and 5pF on inactive channel. Its input leakage current is ±1µA over temperature, allowing direct connection to high-output-impedance sources like thermistors or photodiodes - provided external RC filtering and settling time (tSMPL = 1.5 CLK cycles) are respected per the datasheet timing diagram.
Is the LTC1197LCMS8#PBF pin-compatible with other members of the LTC1197/LTC1199 family?
Yes, the LTC1197LCMS8#PBF shares identical pinout and package (MSOP-8) with LTC1197CMS8, LTC1197LIMS8, and LTC1199LCMS8. However, functional differences exist: LTC1197 variants lack DIN and support only 3-wire interface, while LTC1199 variants include DIN and 2-channel MUX. Swapping requires firmware and schematic review - especially for reference and input configuration.
LTC1197LCMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- 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 ~ 4V
- Voltage - Supply, Digital:
- 2.7V ~ 4V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197LCMS8#PBF FAQ
1.How can I place an order for LTC1197LCMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197LCMS8#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 LTC1197LCMS8#PBF reliable?
The price and inventory of LTC1197LCMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197LCMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1197LCMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197LCMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197LCMS8#PBF?
LTC1197LCMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197LCMS8#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 LTC1197LCMS8#PBF?
For technical support, including LTC1197LCMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197LCMS8#PBF requirements.
6.How does Aetrix verify that LTC1197LCMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1197LCMS8#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 LTC1197LCMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1197LCMS8#PBF?
All LTC1197LCMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197LCMS8#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 LTC1197LCMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1197LCMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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