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Analog Devices Inc. LTC1197LIMS8#PBF
- Part No.:
- LTC1197LIMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1197LIMS8#PBF.pdf
- Description:
- IC ADC 10BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,502
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Product details
Overview
LTC1197LIMS8#PBF 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 to 4V supply, draws only 0.8–2.0mA at full speed, and features auto shutdown that scales supply current linearly with sampling frequency. It is used in portable instrumentation for high-resolution DC-coupled sensor digitization.
For engineers reviewing the LTC1197LIMS8#PBF datasheet, LTC1197LIMS8#PBF pinout, LTC1197LIMS8#PBF application, or LTC1197LIMS8#PBF equivalent, key selection criteria include its 2.7V operation, differential input range (0V to VCC), 10-bit no-missing-codes resolution, 250ksps max sampling rate, and MSOP-8 package compatibility with space-constrained battery-powered systems.
Technical Context
The LTC1197LIMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar conversion only. Its differential input accepts signals referenced to GND or floating common-mode voltages up to VCC, enabling direct connection to low-output-impedance sensors without gain stages.
It uses a 3-wire serial interface (CS, CLK, DOUT) with MSB-first output, requiring no configuration word. Conversion is initiated by CS falling edge; data appears after two null bits, synchronized to CLK rising edges. Power management is fully automatic-no software control needed for shutdown between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, guaranteed no missing codes - ensures monotonicity and precision across full scale. |
| Max Sampling Rate | 250ksps at VCC = 2.7V - supports real-time capture of audio-band and industrial control signals. |
| Analog Input Range | 0V to VCC (differential) - enables ratiometric sensing and direct interfacing with 2.7V-referenced transducers. |
| Supply Current | 0.8–2.0mA at 250ksps - enables >100-hour battery life in 20mA-hr coin cells when duty-cycled. |
| Reference Input | External VREF pin (0.2V to VCC + 0.05V) - allows flexible scaling down to 200mV full-scale for µV-level resolution. |
| INL / DNL | ±1LSB / ±1LSB (max) - ensures accurate linearity for closed-loop feedback and calibration-critical applications. |
| Package | 8-pin MSOP (3mm × 3mm) - fits high-density PCB layouts where SO-8 is too large. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3mm × 3mm body, 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 = auto shutdown mode (µA leakage). |
| 2 - +IN | Differential Analog Input (+) | High-impedance input (20pF); accepts 0V to VCC; requires low-noise source or RC filter for anti-aliasing. |
| 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 solid analog ground plane; separates noise from digital return paths. |
| 5 - VREF | External Reference Input | Defines full-scale range; supports external references (e.g., LT1019) or ratiometric use with sensor excitation. |
| 6 - DOUT | Serial Data Output | 3-state CMOS output; MSB-first, 10-bit result + 2 null bits; tri-states when CS high. |
| 7 - CLK | Serial Clock Input | Accepts 0.01–3.5MHz clock; timing-critical for setup/hold (78ns tsuCS, 40ns thCS at 2.7V). |
| 8 - VCC | Positive Supply | 2.7V to 4V only; requires local 1µF ceramic + 0.1µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown power scaling | Supply current drops linearly with sampling frequency - eliminates need for software-controlled sleep modes. |
| Differential input with adjustable span | Full-scale range programmable from 200mV to VCC - achieves 200µV LSB resolution without external amplifiers. |
| Low-voltage 2.7V operation | Specified performance down to 2.7V - enables direct integration with Li-ion (3.0V–3.6V) and coin-cell (2.7V–3.0V) systems. |
| SPI/MICROWIRE compatibility | No glue logic required - interfaces natively with MSP430, STM32, PIC, and FPGA GPIO with standard shift registers. |
| MSOP-8 footprint | 3mm × 3mm size - reduces board area by ~50% vs SO-8 while maintaining same pinout and thermal resistance (θJA = 210°C/W). |
Applications
| Portable ECG Front-End | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Digitizing low-amplitude, DC-coupled biopotential signals from dry electrodes in handheld ECG monitors. IC Role / Device Role / Timing Role: Precision 10-bit ADC capturing 250ksps raw waveform data with differential input rejecting common-mode electrode offset. Use Value: 2.7V operation extends battery life; 200mV full-scale range resolves microvolt-level ST-segment shifts without op-amp gain stages. |
Use Scenario: Reading RTD or thermistor bridges in wireless HVAC sensor nodes powered by 3V CR2032 batteries. IC Role / Device Role / Timing Role: Ratiometric ADC converting bridge voltage with VREF tied to excitation source - eliminating reference drift errors. Use Value: Auto shutdown cuts average current to <1µA between readings; MSOP-8 enables compact 2-layer PCB design. |
| Handheld Multimeter Input Stage | Battery Management System Voltage Monitor |
Use Scenario: High-accuracy DC voltage measurement (±0.1%) in pocket-sized multimeters with autoranging. IC Role / Device Role / Timing Role: Primary 10-bit sampling ADC accepting 0–3V input via precision resistive divider; VREF set to 2.5V for optimal SNR. Use Value: ±1LSB INL ensures traceable accuracy; 250ksps supports fast continuity beeper response and AC+DC RMS calculation. |
Use Scenario: Monitoring individual cell voltages (0–4.2V) in 3S Li-ion packs using resistor dividers and low-quiescent LDOs. IC Role / Device Role / Timing Role: Low-power ADC sampling each cell sequentially under MCU control; CS toggled per channel. Use Value: 0.8mA active current minimizes self-heating error; differential input rejects shared ground noise across stacked 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 |
|---|---|---|---|
| ADS7822IDR | 2.7V–5.25V supply; 200ksps; SPI-only (no MICROWIRE); 8-pin SOIC only | Lacks MSOP-8 option; higher min supply (2.7V same, but no 2.7V-optimized specs) | Choose if SOIC layout exists and MICROWIRE compatibility is unnecessary. |
| MAX11100ETE+ | 2.7V–3.6V supply; 500ksps; internal reference; 12-bit resolution; 16-pin TQFN | Higher resolution and speed, but larger package and fixed 2.5V ref limits ratiometric flexibility | Choose for higher accuracy needs where board space allows 16-pin TQFN and external ref is not required. |
Compared with ADS7822IDR and MAX11100ETE+, the LTC1197LIMS8#PBF uniquely combines 2.7V-optimized 250ksps performance, differential input with external VREF, and MSOP-8 footprint - making it optimal for ultra-compact, battery-powered sensor nodes requiring design flexibility and minimal BOM count.
Availability
LTC1197LIMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated sensor nodes, and compact multimeter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1197LIMS8#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, power management, and signal conditioning.
The LTC1197LIMS8#PBF belongs to Linear Technology's micropower precision ADC family, designed specifically for space- and energy-constrained applications where 10-bit resolution, 2.7V operation, and minimal external components are critical.
FAQ
What is the maximum clock frequency supported by the LTC1197LIMS8#PBF?
The LTC1197LIMS8#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 this frequency may cause timing violations, increased INL/DNL error, or conversion failure. The device's tCONV is fixed at 2.9µs, requiring ≥10.5 clock cycles per conversion.
Does the LTC1197LIMS8#PBF require an external reference voltage?
Yes, the LTC1197LIMS8#PBF requires an external reference voltage applied to the VREF pin. It accepts 0.2V to VCC + 0.05V, enabling ratiometric operation with sensor excitation or precision references like the LT1019. No internal reference is provided - omitting VREF will result in undefined conversion results.
Can the LTC1197LIMS8#PBF interface with a 3.3V microcontroller SPI port?
Yes, the LTC1197LIMS8#PBF is compatible with 3.3V microcontrollers. Its digital inputs (CS, CLK) accept VIH ≥ 1.9V and VIL ≤ 0.45V at VCC = 2.7V, well within 3.3V logic margins. DOUT outputs VOH ≥ 2.3V and VOL ≤ 0.3V, ensuring reliable level matching without level shifters.
What is the purpose of the auto shutdown feature in the LTC1197LIMS8#PBF?
The auto shutdown feature in the LTC1197LIMS8#PBF automatically powers down the analog circuitry between conversions when CS is high, reducing supply current to ≤3µA. This eliminates software overhead for sleep/wake control and enables true micropower operation in intermittent-sampling applications like wireless sensor nodes.
Is the LTC1197LIMS8#PBF pin-compatible with the standard LTC1197IMS8#PBF?
Yes, the LTC1197LIMS8#PBF is pin-compatible with the LTC1197IMS8#PBF and shares identical MSOP-8 pinout and footprint. However, they differ in supply range (LTC1197L: 2.7–4V; LTC1197: 4–9V) and max sampling rate (250ksps vs 500ksps), so direct substitution requires verifying voltage and speed requirements.
LTC1197LIMS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1197LIMS8#PBF FAQ
1.How can I place an order for LTC1197LIMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1197LIMS8#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 LTC1197LIMS8#PBF reliable?
The price and inventory of LTC1197LIMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1197LIMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1197LIMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1197LIMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1197LIMS8#PBF?
LTC1197LIMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1197LIMS8#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 LTC1197LIMS8#PBF?
For technical support, including LTC1197LIMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1197LIMS8#PBF requirements.
6.How does Aetrix verify that LTC1197LIMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1197LIMS8#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 LTC1197LIMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1197LIMS8#PBF?
All LTC1197LIMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1197LIMS8#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 LTC1197LIMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1197LIMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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