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Analog Devices Inc. LTC1197IS8#TRPBF
- Part No.:
- LTC1197IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1197IS8#TRPBF.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LTC1197IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with differential analog input, internal sample-and-hold, and SPI/MICROWIRE-compatible 3-wire serial interface. It operates from a single 2.7V supply, draws only 2.2mW at full speed, and features auto shutdown that linearly scales supply current down to µA levels at low sampling rates. It is used in portable instrumentation for high-resolution DC-coupled sensor digitization.
For engineers reviewing the LTC1197IS8#TRPBF datasheet, LTC1197IS8#TRPBF pinout, LTC1197IS8#TRPBF application, or LTC1197IS8#TRPBF equivalent, key selection criteria include its 2.7V operation, 10-bit no-missing-codes resolution, differential input range (0V to VCC), 250ksps max sampling rate, and MSOP-8 package compatibility with space-constrained embedded systems.
Technical Context
The LTC1197IS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and programmable reference input (VREF). Its differential input supports ratiometric measurement and direct connection to low-output-impedance sensors without gain stages.
It uses a synchronous 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, requiring 14 clock cycles per conversion. The device enters automatic power-down between conversions when CS is high, reducing ICC to ≤3µA - enabling true micropower operation in battery-powered data loggers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, no missing codes - guarantees monotonic transfer function for precision control feedback loops. |
| Max Sampling Rate | 250ksps at VCC = 2.7V - supports real-time capture of audio-band and industrial sensor signals. |
| Supply Voltage | 2.7V to 4V - enables direct integration with Li-ion single-cell or regulated 3.3V rails without level-shifting. |
| Power Dissipation | 2.2mW typical at 250ksps - allows continuous operation in thermally constrained handheld devices. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures <1 LSB integral and differential nonlinearity for accurate calibration-critical applications. |
| S/(N+D) | 58dB at 50kHz input - delivers usable ENOB ≈ 9.3 bits for medium-speed signal acquisition. |
| Analog Input Range | 0V to VCC (differential) - supports rail-to-rail input with common-mode rejection up to VCC/2. |
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 serial transfer; high state triggers auto shutdown. |
| 2 - +IN | Differential Analog Input (+) | High-impedance input (20pF); accepts 0V to VCC; requires low-noise source impedance ≤1kΩ for full accuracy. |
| 3 - –IN | Differential Analog Input (–) | Matches +IN; defines common-mode voltage; must remain stable during sampling (≤1LSB drift). |
| 4 - GND | Analog Ground | Primary reference for analog circuitry; must connect directly to low-impedance analog ground plane. |
| 5 - VREF | External Reference Input | Accepts 0.2V to (VCC + 0.05V); sets full-scale range; bypass with 1µF ceramic for noise immunity. |
| 6 - DOUT | Serial Data Output | Three-state CMOS output; MSB-first, 10-bit result plus 4 null bits; Hi-Z when CS high. |
| 7 - CLK | Serial Clock Input | Accepts 0.01–3.5MHz; rising edge clocks data; duty cycle ≥40%; drives internal timing and sampling. |
| 8 - VCC | Positive Supply | 2.7V–4V single supply; requires local 0.1µF + 1µF bypass to GND; powers analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Shutdown Mode | ICC drops linearly from 2mA @ 250ksps to ≤3µA @ standby - eliminates external power-gating logic. |
| Differential Input Architecture | Rejects common-mode noise up to VCC/2; enables direct connection to bridge sensors and isolated amplifiers. |
| Adjustable Full-Scale Span | VREF pin accepts 200mV–2.75V inputs - supports 200µV effective resolution for microvolt-level measurements. |
| SPI/MICROWIRE Compatibility | No glue logic required; interoperates with STM32, MSP430, and PIC microcontrollers using standard firmware drivers. |
| MSOP-8 Package | 3mm × 3mm footprint - reduces PCB area by >50% vs SO-8, critical for wearable and IoT edge nodes. |
Applications
| Portable ECG Monitor | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Digitizing low-amplitude, DC-coupled biopotential signals from dry-electrode ECG front-end with minimal power budget. IC Role / Device Role / Timing Role: Primary 10-bit ADC capturing lead-II differential voltage at 250ksps with auto shutdown between heartbeats. Use Value: 2.2mW operation extends battery life to >72 hours on CR2032; differential input rejects 50/60Hz mains interference without external filters. | Use Scenario: Reading RTD or thermistor outputs in wireless HVAC sensor modules powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision ratiometric ADC interfaced to 2.5V reference and op-amp buffer, sampling once per second. Use Value: Auto shutdown reduces average ICC to <1µA; adjustable VREF enables 0.1°C resolution over –40°C to +85°C range. |
| Handheld Multimeter Front-End | Low-Power Data Logger |
Use Scenario: High-accuracy DC voltage and current measurement in battery-operated benchtop multimeters. IC Role / Device Role / Timing Role: Core ADC for autoranging analog front-end, supporting 100mV–10V spans via VREF scaling. Use Value: ±1 LSB INL/DNL ensures calibrated accuracy to 0.02%; 2.7V operation avoids need for boost converters. | Use Scenario: Environmental monitoring node logging temperature, humidity, and light intensity every 10 seconds. IC Role / Device Role / Timing Role: Shared ADC for multiple conditioned analog channels, triggered by MCU timer interrupt. Use Value: MSOP-8 footprint saves board space; 3-wire interface minimizes GPIO usage on ultra-low-pin-count MCUs. |
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; 10-bit, 200ksps; 2.7–5.25V supply; SPI-only interface; no auto shutdown. | Higher power (3.5mW @ 200ksps); lacks differential input - requires external instrumentation amp for sensor interfaces. | Choose if SOIC footprint preferred and external power management acceptable. |
| MAX11100ETE+ | 12-bit, 500ksps; 2.7–3.6V supply; internal reference; 10-pin TDFN; SPI/MICROWIRE. | Higher resolution but larger package; fixed 2.048V ref limits span flexibility; no VREF pin for ratiometric use. | Choose when 12-bit resolution is mandatory and external reference not needed. |
Compared with ADS7822U and MAX11100ETE+, the LTC1197IS8#TRPBF uniquely combines differential input, user-adjustable VREF, auto shutdown, and MSOP-8 size - making it optimal for compact, battery-powered sensor systems requiring design flexibility and ultra-low quiescent power.
Availability
LTC1197IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, handheld test equipment, and low-power data loggers requiring stable component supply across extended product lifecycles.
Supply support for LTC1197IS8#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.
The LTC1197IS8#TRPBF belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for micropower, high-resolution digitization in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling frequency of the LTC1197IS8#TRPBF?
The LTC1197IS8#TRPBF supports a maximum sampling frequency of 250ksps when operating from a 2.7V supply. This is specified under recommended conditions (VCC = 2.7V, VREF = 2.5V, fCLK = 3.5MHz) and applies across the full –45°C to +85°C industrial temperature range. At higher supply voltages (e.g., 5V), the LTC1197 variant achieves 500ksps, but the 'I' grade LTC1197IS8#TRPBF is rated only for the 2.7V–4V range and 250ksps performance.
Does the LTC1197IS8#TRPBF require an external reference voltage?
Yes, the LTC1197IS8#TRPBF requires an external reference voltage applied to the VREF pin. It accepts 0.2V to (VCC + 0.05V), enabling flexible full-scale span configuration - for example, 2.5V for standard ratiometric use or 200mV for high-resolution microvolt measurements. Unlike some ADCs, it does not include an internal reference; the VREF pin is mandatory for operation.
Can the LTC1197IS8#TRPBF interface directly with a microcontroller SPI port?
Yes, the LTC1197IS8#TRPBF is fully compatible with standard SPI and MICROWIRE protocols using its 3-wire interface (CS, CLK, DOUT). It requires no additional level-shifting or protocol translation. The device outputs MSB-first data synchronized to the rising CLK edge, with 14 clock cycles per frame (10 data bits + 4 null bits), and supports standard SPI mode 0 (CPOL = 0, CPHA = 0).
What is the operating temperature range of the LTC1197IS8#TRPBF?
The LTC1197IS8#TRPBF is specified for operation from –45°C to +85°C. This industrial-grade temperature range is confirmed in the "Order Information" table of the datasheet, where the 'I' suffix denotes the –45°C to +85°C grade. All key specifications - including INL, DNL, S/(N+D), and supply current - are guaranteed across this full range.
How does the auto shutdown feature work on the LTC1197IS8#TRPBF?
The LTC1197IS8#TRPBF automatically enters low-power shutdown whenever the CS pin is held high. In this state, supply current drops to ≤3µA (typical), independent of clock activity. Power consumption scales linearly with sampling frequency when CS is pulsed - e.g., ~800µA at 250ksps, ~80µA at 25ksps. No software command or register write is needed; shutdown is purely hardware-controlled via CS timing.
LTC1197IS8#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):
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197IS8#TRPBF FAQ
1.How can I place an order for LTC1197IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197IS8#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 LTC1197IS8#TRPBF reliable?
The price and inventory of LTC1197IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1197IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197IS8#TRPBF?
LTC1197IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197IS8#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 LTC1197IS8#TRPBF?
For technical support, including LTC1197IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1197IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1197IS8#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 LTC1197IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1197IS8#TRPBF?
All LTC1197IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197IS8#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 LTC1197IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1197IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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