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Analog Devices Inc. LTC1197IMS8#PBF
- Part No.:
- LTC1197IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1197IMS8#PBF.pdf
- Description:
- IC ADC 10BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,374
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Product details
Overview
LTC1197IMS8#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 LTC1197IMS8#PBF datasheet, LTC1197IMS8#PBF pinout, LTC1197IMS8#PBF application, or LTC1197IMS8#PBF 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 thermal performance (θJA = 210°C/W).
Technical Context
The LTC1197IMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and rail-to-rail analog input capability. Its differential input accepts common-mode voltages up to VCC and supports reduced spans down to 200mV full-scale for 200µV resolution.
It uses a 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, compatible with SPI and MICROWIRE protocols without glue logic. Conversion is initiated by CS falling edge; data is valid after fixed tCONV = 2.9µs (at 2.7V), and automatic power-down reduces supply current linearly with sampling frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit with no missing codes - guarantees monotonic transfer function for precision measurement systems. |
| Max Sampling Rate | 250ksps at VCC = 2.7V - enables real-time capture of audio-band and industrial sensor signals. |
| Supply Voltage | 2.7V to 4V - optimized for single-cell Li-ion or 3.3V system rails without level-shifting. |
| Supply Current | 0.8mA typ at 250ksps - supports battery life extension in portable instrumentation. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures accurate linearity for calibration-critical applications like medical sensors. |
| Reference Input | 0.2V to VCC + 0.05V - allows flexible ratiometric or external reference configurations (e.g., 2.5V REF). |
| Dynamic Performance | S/(N+D) = 58dB at 50kHz - suitable for medium-fidelity signal acquisition where SNR > 57dB is required. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3mm × 3mm, 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); accepts 0V to VCC range; 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 | Must connect directly to clean analog ground plane; separates analog/digital return paths. |
| 5 - VREF | External Reference Input | Defines full-scale range; supports 0.2V–VCC+0.05V; bypass with 1µF capacitor recommended. |
| 6 - DOUT | Serial Data Output | 3-wire SPI-compatible output; MSB-first; Hi-Z when CS high; timing referenced to CLK↑. |
| 7 - CLK | Serial Clock Input | Accepts 0.01–3.5MHz clock; rising edge synchronizes data sampling and output timing. |
| 8 - VCC | Positive Supply | 2.7V–4V single supply; requires local 0.1µF ceramic bypass to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Differential analog input | Enables rejection of common-mode noise in sensor front-ends (e.g., bridge transducers) without external instrumentation amplifiers. |
| Auto shutdown | Reduces supply current linearly with sampling frequency - e.g., ~0.1mA at 25ksps - enabling adaptive power management. |
| 2.7V operation | Eliminates need for voltage regulators in 3.3V or single-cell battery systems, reducing BOM count and PCB area. |
| 10-bit no-missing-codes | Guarantees monotonicity across full temperature range (–45°C to 85°C), critical for closed-loop control feedback paths. |
| SPI/MICROWIRE compatibility | Direct interface to microcontrollers (e.g., ARM Cortex-M0+, MSP430) without protocol translation or additional logic. |
Applications
| Portable ECG Monitor | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Digitizing low-amplitude, high-impedance biopotential signals from dry electrodes with minimal power draw. IC Role / Device Role / Timing Role: Precision 10-bit ADC capturing differential lead-II ECG waveforms at 250ksps with 2.7V battery supply. Use Value: 200µV resolution at 200mV span enables detection of sub-millivolt ST-segment shifts without gain-stage amplification. | Use Scenario: Reading thermistor or RTD bridges in wireless sensor nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power SAR ADC performing ratiometric measurements against a stable 2.5V reference. Use Value: 0.8mA active current and auto shutdown extend 10-year battery life in intermittent-sampling deployments. |
| Handheld Multimeter Front-End | Low-Power Data Logger |
Use Scenario: High-accuracy DC voltage and current measurement using precision shunts and dividers. IC Role / Device Role / Timing Role: Differential-input ADC rejecting common-mode noise from switching power supplies in compact enclosures. Use Value: ±1 LSB INL/DNL ensures <0.02% measurement accuracy over –45°C to 85°C without factory recalibration. | Use Scenario: Continuous environmental monitoring (humidity, pressure) in remote locations with solar/battery hybrid power. IC Role / Device Role / Timing Role: Serial-output ADC interfaced to ultra-low-power MCU via 3-wire SPI for burst-mode acquisition. Use Value: MSOP-8 footprint and 210°C/W thermal resistance allow reliable operation in sealed, convection-limited enclosures. |
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 |
|---|---|---|---|
| ADS7822IDR | 2.7V–5.25V supply; 200ksps; internal reference; SO-8 package; higher ICC (1.2mA @ 200ksps) | Requires no external reference but lacks differential input - needs external op-amp for bridge sensing. | Choose when reference integration and SO-8 availability outweigh need for differential input and lowest power. |
| MAX11100ETE+ | 2.7V–3.6V supply; 500ksps; internal reference; 12-bit resolution; 16-pin TQFN; higher ICC (2.5mA @ 500ksps) | Higher resolution and speed, but larger package and 3× higher power - unsuitable for coin-cell use. | Choose when 12-bit resolution and 500ksps are mandatory, and board space/power budget permit. |
Compared with ADS7822IDR and MAX11100ETE+, the LTC1197IMS8#PBF delivers superior power efficiency (0.8mA vs ≥1.2mA) and native differential input capability in a smaller MSOP-8 package, making it optimal for space-constrained, battery-sensitive measurement systems requiring true 10-bit linearity.
Availability
LTC1197IMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and handheld test equipment requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for LTC1197IMS8#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 LTC1197IMS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-accuracy measurement systems operating from single low-voltage supplies.
FAQ
What is the maximum sampling rate of the LTC1197IMS8#PBF?
The LTC1197IMS8#PBF achieves a maximum sampling rate of 250ksps when operated at VCC = 2.7V with fCLK = 3.5MHz. This is specified over the full industrial temperature range (–45°C to 85°C). At higher supply voltages (e.g., 5V), the LTC1197 variant supports up to 500ksps, but the LTC1197IMS8#PBF is the 2.7V-rated version and is not characterized for operation above 250ksps.
Does the LTC1197IMS8#PBF support differential input operation?
Yes, the LTC1197IMS8#PBF supports true differential input operation via pins 2 (+IN) and 3 (–IN). It accepts analog inputs from 0V to VCC on both terminals, enabling common-mode rejection and direct connection to bridge sensors or isolated signal sources without external amplification. The device does not support pseudo-differential or single-ended-only modes - differential input is its native configuration.
What reference voltage options are supported by the LTC1197IMS8#PBF?
The LTC1197IMS8#PBF accepts an external reference voltage applied to the VREF pin (pin 5), supporting ranges from 0.2V to VCC + 0.05V. Common configurations include 2.5V (e.g., REF02), ratiometric use with a precision resistor divider from VCC, or low-drift bandgap references. The device draws only 0.001–3µA reference current, minimizing loading error on high-impedance sources.
Is the LTC1197IMS8#PBF pin-compatible with other members of the LTC1197 family?
Yes, the LTC1197IMS8#PBF is pin-compatible with all 8-pin MSOP variants in the LTC1197/LTC1197L family, including LTC1197CMS8, LTC1197LCMS8, and LTC1197LIMS8. All share identical pinout, package dimensions, and footprint. However, electrical specifications differ: the "I" grade (–45°C to 85°C) and "L" suffix (2.7V–4V operation) define the LTC1197IMS8#PBF's rated performance envelope.
How does the auto shutdown feature reduce power consumption in the LTC1197IMS8#PBF?
The LTC1197IMS8#PBF automatically enters low-power shutdown when CS is high, drawing only leakage current (~3µA). During active sampling, supply current scales linearly with sampling frequency - e.g., 0.8mA at 250ksps drops to ~0.08mA at 25ksps. This enables dynamic power scaling in burst-mode systems, extending battery life without firmware intervention or external control logic.
LTC1197IMS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197IMS8#PBF FAQ
1.How can I place an order for LTC1197IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197IMS8#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 LTC1197IMS8#PBF reliable?
The price and inventory of LTC1197IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1197IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197IMS8#PBF?
LTC1197IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197IMS8#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 LTC1197IMS8#PBF?
For technical support, including LTC1197IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197IMS8#PBF requirements.
6.How does Aetrix verify that LTC1197IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1197IMS8#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 LTC1197IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1197IMS8#PBF?
All LTC1197IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197IMS8#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 LTC1197IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1197IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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