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Analog Devices Inc. LTC1197CMS8#PBF
- Part No.:
- LTC1197CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1197CMS8#PBF.pdf
- Description:
- IC ADC 10BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
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Product details
Overview
LTC1197CMS8#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, external reference support, and auto shutdown in an 8-pin MSOP package. It operates from a single 2.7V supply, draws only 0.8mA at full speed, and features SPI/MICROWIRE-compatible 3-wire serial I/O. It is used in portable instrumentation for high-resolution sampling of low-voltage sensor signals.
For engineers reviewing the LTC1197CMS8#PBF datasheet, LTC1197CMS8#PBF pinout, LTC1197CMS8#PBF application, or LTC1197CMS8#PBF equivalent, key selection criteria include its 2.7V operation, 10-bit no-missing-codes resolution, differential input architecture, 250ksps maximum sampling rate, and MSOP-8 thermal performance (θJA = 210°C/W).
Technical Context
The LTC1197CMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and programmable auto shutdown. Its differential input accepts 0V to VCC common-mode range with adjustable reference via VREF pin, enabling ratiometric or external-reference configurations.
It uses a 3-wire synchronous serial interface (CS, CLK, DOUT) compatible with SPI and MICROWIRE protocols. Conversion timing is clock-driven: tCONV = 2.9µs, with 14-clock cycle time and 1.5-clock sampling window, supporting deterministic data capture in resource-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit with no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Max Sampling Rate | 250ksps at VCC = 2.7V - supports real-time acquisition of audio-band and sensor signals without aliasing. |
| Supply Voltage | 2.7V to 4V - enables direct integration into 3V battery-powered systems without LDO overhead. |
| Supply Current | 0.8mA typical at 250ksps - reduces system power budget and extends battery life in portable instruments. |
| INL / DNL | ±1LSB / ±1LSB - ensures <1 LSB linearity error across full temperature range for calibrated sensor interfaces. |
| Reference Input | VREF pin supports 0.2V to VCC+0.05V - allows flexible scaling down to 200mV full-scale for microvolt-level resolution. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade industrial and test equipment environments. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3mm × 3mm body, 0.65mm pitch, θJA = 210°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Active-low enable; initiates conversion and serial transfer; high state triggers auto shutdown. |
| 2 +IN | Differential Analog Input (+) | High-impedance input (20pF) accepting 0V to VCC range; requires low-noise source coupling. |
| 3 –IN | Differential Analog Input (–) | Matches +IN; enables true differential measurement or single-ended with GND reference. |
| 4 GND | Analog Ground | Must connect directly to analog ground plane; separates noise-sensitive analog and digital return paths. |
| 5 VREF | External Reference Input | Defines full-scale span; supports external precision references or ratiometric connection to sensor excitation. |
| 6 DOUT | Serial Data Output | 3-wire MSB-first output; tri-state when CS high; compatible with 3.3V/2.7V logic interfaces. |
| 7 CLK | Serial Clock Input | Accepts up to 3.5MHz clock at 2.7V; rising edge synchronizes data capture and output timing. |
| 8 VCC | Positive Supply | 2.7V to 4V single supply; requires local 1µF ceramic bypass to GND for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Differential analog input | Enables rejection of common-mode noise in sensor front-ends and eliminates need for external instrumentation amplifiers. |
| Auto shutdown mode | Reduces supply current linearly with sampling frequency - cuts power to ~1µA at 1Hz sample rate for ultra-low-duty-cycle monitoring. |
| Adjustable reference input (VREF) | Supports full-scale spans as low as 200mV, achieving 200µV effective resolution without gain stages. |
| SPI/MICROWIRE-compatible interface | Eliminates protocol translation logic; interoperates directly with ARM Cortex-M, MSP430, and PIC microcontrollers. |
| MSOP-8 thermal performance | θJA = 210°C/W enables reliable operation in compact PCB layouts without forced air or heatsinking. |
Applications
| Portable ECG Monitor | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Digitizing low-amplitude, high-impedance biopotential signals from dry electrodes in battery-powered wearable ECG devices. IC Role / Device Role / Timing Role: 10-bit SAR ADC performing synchronized sampling at 250ksps with differential input rejecting 50/60Hz mains interference. Use Value: 2.7V operation and 0.8mA active current extend battery life beyond 72 hours; adjustable VREF enables direct digitization of ±100mV ECG waveforms. | Use Scenario: Converting output of RTD or thermistor bridges in distributed factory-floor temperature sensors powered by 3.3V energy-harvesting circuits. IC Role / Device Role / Timing Role: Precision analog front-end ADC with ratiometric reference capability, measuring bridge voltage ratios independent of supply variation. Use Value: Differential input and ±1LSB INL ensure <0.1°C measurement accuracy; auto shutdown reduces average current to <1µA during 1-second polling intervals. |
| Handheld Multimeter | Low-Power Data Logger |
Use Scenario: High-resolution DC voltage and current measurement in palm-sized multimeters using dual-slope or sigma-delta assist architectures. IC Role / Device Role / Timing Role: Fast-settling 10-bit ADC capturing transient events (e.g., inrush current spikes) with 250ksps burst mode. Use Value: 20pF input capacitance and high-Z inputs minimize loading on passive probe networks; MSOP-8 footprint saves board space in constrained enclosures. | Use Scenario: Long-duration environmental monitoring (temperature, humidity, light) deployed in remote locations with coin-cell or solar-battery power. IC Role / Device Role / Timing Role: Low-duty-cycle sampling ADC triggered by microcontroller RTC interrupt, converting sensor outputs every 10 seconds. Use Value: Shutdown current <3µA and linear power scaling allow average system current below 10µA - enabling >5-year operation on CR2032 cells. |
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-bit resolution, 200ksps, 2.7V–5.25V supply, SPI interface, no differential input | Limited to lower-accuracy industrial control feedback loops where 8-bit resolution suffices | Select when cost sensitivity outweighs resolution requirements and differential input is unnecessary |
| MAX11100ETE+ | 10-bit, 500ksps, 2.7V–3.6V supply, internal reference, no VREF pin, TDFN-12 package | Requires no external reference but lacks VREF flexibility for ratiometric sensor interfaces | Select when board space permits TDFN-12 and fixed 2.048V internal reference meets system accuracy goals |
Compared with ADS7822U and MAX11100ETE+, the LTC1197CMS8#PBF uniquely combines differential input, external VREF pin, and guaranteed 10-bit no-missing-codes performance in MSOP-8 - making it optimal for precision, low-power, sensor-ratiometric designs where layout area and supply headroom are constrained.
Availability
LTC1197CMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated sensor nodes, and compact test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1197CMS8#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 LTC1197CMS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for ultra-low-power, high-resolution sampling in space- and energy-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the LTC1197CMS8#PBF?
The LTC1197CMS8#PBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This clock rate enables its full 250ksps sampling capability and is specified over the entire 0°C to 70°C operating temperature range. Exceeding this frequency may cause conversion errors or timing violations in the serial interface.
Does the LTC1197CMS8#PBF require an external reference voltage?
No, the LTC1197CMS8#PBF does not require an external reference - it accepts an externally applied reference via the VREF pin but can also operate ratiometrically using the same supply that powers sensors. The VREF pin supports input ranges from 0.2V to VCC+0.05V, allowing flexible configuration for both precision and cost-sensitive applications.
Can the LTC1197CMS8#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1197CMS8#PBF is fully compatible with 3.3V microcontrollers. Its digital I/O thresholds are specified for VCC = 2.7V to 4V, with VIH = 1.9V and VIL = 0.45V at VCC = 2.7V - ensuring robust logic-level compatibility. The DOUT pin drives to 2.3V minimum under 360µA load, meeting standard 3.3V CMOS input requirements.
What is the analog input leakage current specification for the LTC1197CMS8#PBF?
The LTC1197CMS8#PBF specifies analog input leakage current as ±1µA over the full operating temperature range (0°C to 70°C). This low leakage enables direct connection to high-impedance sources such as thermistors, RTDs, and piezoelectric sensors without significant measurement error due to loading effects.
How does auto shutdown reduce power consumption in the LTC1197CMS8#PBF?
The LTC1197CMS8#PBF reduces supply current linearly as sampling frequency decreases - drawing 0.8mA at 250ksps but dropping to sub-µA levels at very low rates. When CS is held high between conversions, the device enters full shutdown, drawing only leakage current (~3µA max), making it ideal for duty-cycled sensor readouts in battery-powered systems.
LTC1197CMS8#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):
- 500k
- 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:
- 4V ~ 9V
- Voltage - Supply, Digital:
- 4V ~ 9V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197CMS8#PBF FAQ
1.How can I place an order for LTC1197CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197CMS8#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 LTC1197CMS8#PBF reliable?
The price and inventory of LTC1197CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1197CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197CMS8#PBF?
LTC1197CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197CMS8#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 LTC1197CMS8#PBF?
For technical support, including LTC1197CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197CMS8#PBF requirements.
6.How does Aetrix verify that LTC1197CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1197CMS8#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 LTC1197CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1197CMS8#PBF?
All LTC1197CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197CMS8#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 LTC1197CMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1197CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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