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Analog Devices Inc. LTC1197LIS8#TRPBF
- Part No.:
- LTC1197LIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1197LIS8#TRPBF.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
LTC1197LIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, internal sample-and-hold, and 3-wire SPI/MICROWIRE-compatible serial interface. It operates from a single 2.7V supply, draws only 0.8mA at full speed, and features auto shutdown that scales supply current linearly with sampling rate. It is used in portable instrumentation for high-resolution DC-coupled signal acquisition.
For engineers reviewing the LTC1197LIS8#TRPBF datasheet, LTC1197LIS8#TRPBF pinout, LTC1197LIS8#TRPBF application, or LTC1197LIS8#TRPBF equivalent, key selection criteria include its 2.7V operation, differential input range (0V to VCC), 2.2mW typical power dissipation, ±2 LSB offset error, and MSOP-8 package compatibility with space-constrained embedded systems.
Technical Context
The LTC1197LIS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and rail-to-rail analog input capability. Its differential input accepts signals from 0V to VCC with adjustable reference via VREF pin, enabling ratiometric or external-reference configurations.
It uses a synchronous 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, no DIN required. Conversion timing is fixed at 10.5 clock cycles per sample, with tCONV = 2.9µs at fCLK = 3.5MHz and full-scale range up to 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes with no missing codes guaranteed |
| Max Sampling Rate | 250ksps - supports real-time acquisition of signals up to ~125kHz Nyquist bandwidth |
| Supply Voltage | 2.7V to 4V - enables direct integration into 3V battery-powered systems without regulation |
| Supply Current | 0.8mA typ at 250ksps - enables micropower operation; drops linearly with reduced sample rate |
| Power Dissipation | 2.2mW typ at 2.7V - allows continuous operation in thermally constrained PCB layouts |
| Input Range | 0V to VCC differential - supports direct connection to sensors with common-mode voltage up to VCC |
| Reference Input | VREF pin accepts 0.2V to VCC + 0.05V - permits flexible scaling down to 200mV full-scale for 200µV resolution |
Pinout & Package
Package: 8-pin MSOP (MS8), 3mm × 3mm, 0.65mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select Input | Active-low enable; initiates conversion and data transfer; high state activates auto shutdown |
| 2 - +IN | Differential Analog Input (+) | High-impedance input (20pF); accepts 0V to VCC; requires low-noise source coupling |
| 3 - –IN | Differential Analog Input (–) | High-impedance input (20pF); defines common-mode reference; must remain stable during sampling |
| 4 - GND | Analog Ground | Primary return path for analog circuitry; must connect directly to low-impedance analog ground plane |
| 5 - VREF | External Reference Input | Defines full-scale range; supports 0.2V to VCC + 0.05V; bypassing with 1µF recommended |
| 6 - DOUT | Serial Data Output | CMOS-compatible, tri-stateable output; MSB-first format; valid 130ns after CLK↑ |
| 7 - CLK | Serial Clock Input | Accepts 0.01–3.5MHz; rising edge synchronizes data capture and output; duty cycle ≥40% |
| 8 - VCC | Positive Supply | 2.7V–4V single supply; requires local 0.1µF ceramic + 1µF tantalum bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| Differential analog input | Enables rejection of common-mode noise and direct interfacing to bridge sensors or op-amp outputs |
| Auto shutdown with linear power scaling | Reduces ICC from 0.8mA to sub-µA between conversions-no software control needed |
| 2.7V single-supply operation | Eliminates level-shifting or charge-pump circuitry in battery-powered designs |
| Adjustable reference input (VREF) | Supports full-scale spans as low as 200mV, achieving 200µV effective resolution |
| SPI/MICROWIRE-compatible 3-wire interface | Requires only CS, CLK, DOUT-no DIN or additional logic; compatible with most microcontrollers |
Applications
| Portable Data Loggers | Battery-Powered Sensor Nodes |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and humidity using low-power analog sensors in field-deployed units. IC Role / Device Role / Timing Role: ADC digitizes sensor outputs at 100–250ksps with minimal power overhead; auto shutdown extends battery life between wake-up intervals. Use Value: 0.8mA active current and µA-level shutdown current enable multi-year operation on coin-cell batteries. |
Use Scenario: Wireless IoT endpoints acquiring analog signals from MEMS accelerometers or gas sensors before RF transmission. IC Role / Device Role / Timing Role: Provides 10-bit precision at 2.7V supply while interfacing directly to unbuffered sensor outputs via differential inputs. Use Value: Eliminates need for external gain stages or reference buffers due to 0V–VCC input range and 200mV minimum span support. |
| Medical Vital Sign Monitors | Industrial Process Controllers |
Use Scenario: ECG/EEG front-end signal conditioning where low-noise, DC-coupled acquisition is critical. IC Role / Device Role / Timing Role: Digitizes biopotential signals with ±2 LSB offset error and 58dB SNR at 50kHz input, referenced to patient-isolated ground. Use Value: Differential input rejects 50/60Hz mains interference without requiring instrumentation amplifiers. |
Use Scenario: PLC analog input modules measuring 4–20mA loop signals or thermocouple outputs in factory environments. IC Role / Device Role / Timing Role: Converts isolated analog inputs with ratiometric accuracy using system-supply-referenced VREF. Use Value: Tolerates supply variations from 2.7V to 4V while maintaining ±4 LSB gain error across temperature. |
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, 2.7–5.25V supply, SPI interface, no differential input | Limited to lower-precision applications; lacks differential input and auto shutdown | Select when cost sensitivity outweighs resolution and noise rejection requirements |
| MAX11100ETE+ | 12-bit resolution, 500ksps, 2.7–3.6V supply, internal reference, no VREF pin | Higher resolution but fixed 2.048V reference; no external reference flexibility | Select when higher ENOB and internal reference simplify BOM, but external VREF is not required |
Compared with ADS7822U and MAX11100ETE+, the LTC1197LIS8#TRPBF uniquely combines 10-bit differential input, user-adjustable VREF, and linear auto shutdown-making it optimal for precision, low-power, sensor-front-end applications where reference flexibility and noise immunity are essential.
Availability
LTC1197LIS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, medical vital sign monitors, and industrial process controllers requiring stable component supply and long-term lifecycle support.
Supply support for LTC1197LIS8#TRPBF 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 LTC1197LIS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for ultra-low-power, high-resolution analog-to-digital conversion in space- and energy-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the LTC1197LIS8#TRPBF?
The LTC1197LIS8#TRPBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This corresponds to a maximum sampling rate of 250ksps. Exceeding this frequency may cause timing violations, increased INL/DNL errors, or conversion failure. The device's tCYC is fixed at 14 clock cycles, and tCONV is 2.9µs under these conditions.
Does the LTC1197LIS8#TRPBF require an external reference voltage?
No-the LTC1197LIS8#TRPBF does not require an external reference, but it does require a reference voltage applied to the VREF pin to define its full-scale range. VREF can be tied to VCC for ratiometric operation or driven by a precision external reference (0.2V to VCC + 0.05V). The LTC1197LIS8#TRPBF has no internal reference; VREF is mandatory for conversion.
Can the LTC1197LIS8#TRPBF interface directly with a microcontroller GPIO without level shifting?
Yes-the LTC1197LIS8#TRPBF's digital I/O (CS, CLK, DOUT) is fully CMOS-compatible with 2.7V logic levels: VIH = 1.9V min and VOL = 0.3V max at 400µA sink. When interfaced with 2.7V–3.3V microcontrollers (e.g., ARM Cortex-M0+, MSP430), no level shifting is needed. For 5V MCUs, a simple resistor divider or buffer is required on CS/CLK.
What is the analog input impedance of the LTC1197LIS8#TRPBF?
The LTC1197LIS8#TRPBF exhibits 20pF input capacitance on the active analog channel (+IN or –IN) and 5pF on the inactive channel. Its DC input leakage is ±1µA over temperature. Due to the switched-capacitor architecture, effective AC input impedance varies with sampling frequency and source resistance-designs with RSOURCE > 1kΩ require external buffering to maintain accuracy.
How does auto shutdown work on the LTC1197LIS8#TRPBF?
Auto shutdown on the LTC1197LIS8#TRPBF is hardware-controlled and fully automatic: when CS is high, the device enters shutdown mode drawing only ~3µA. During active conversion (CS low), supply current scales linearly with sampling frequency-from 0.8mA at 250ksps down to sub-µA at <1ksps. No firmware intervention or configuration registers are required.
LTC1197LIS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197LIS8#TRPBF FAQ
1.How can I place an order for LTC1197LIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197LIS8#TRPBF 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 LTC1197LIS8#TRPBF reliable?
The price and inventory of LTC1197LIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197LIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1197LIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197LIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197LIS8#TRPBF?
LTC1197LIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197LIS8#TRPBF 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 LTC1197LIS8#TRPBF?
For technical support, including LTC1197LIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197LIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1197LIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1197LIS8#TRPBF 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 LTC1197LIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1197LIS8#TRPBF?
All LTC1197LIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197LIS8#TRPBF, 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 LTC1197LIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1197LIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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