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Analog Devices Inc. LTC1864IMS8#PBF
- Part No.:
- LTC1864IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1864IMS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,079
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Product details
Overview
LTC1864IMS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps single-channel differential successive approximation ADC in an 8-lead MSOP package, operating on a single 5V supply with 850μA typical supply current at full speed and auto-shutdown to 2μA at 1ksps. It features true differential analog inputs (IN+, IN–), adjustable external reference (VREF), SPI/MICROWIRE-compatible 3-wire serial interface, and guaranteed operation from –40°C to +85°C - ideal for portable instrumentation and isolated data acquisition systems.
For engineers reviewing the LTC1864IMS8#PBF datasheet, LTC1864IMS8#PBF pinout, LTC1864IMS8#PBF application, or LTC1864IMS8#PBF equivalent, key selection criteria include its 16-bit resolution with ±8 LSB INL, 87 dB SNR, 2.75 μs conversion time, rail-to-rail input capability down to 1V full-scale, and MSOP-8 thermal performance (θJA = 210°C/W).
Technical Context
The LTC1864IMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion without external support circuitry. Its differential input stage rejects common-mode noise, while the adjustable VREF pin allows flexible full-scale span configuration from 1V to 5V.
Control is managed via a single CONV input that initiates conversion on the rising edge and enables SDO output on the falling edge; serial data is clocked out on SCK falling edges with synchronous capture on rising edges - fully compatible with standard SPI master interfaces and requiring no configuration registers or software overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision measurement of small signal changes. |
| Sampling Rate | 250 ksps - supports real-time acquisition of signals up to 125 kHz full-linear bandwidth (S/(N+D) ≥ 75 dB). |
| Supply Current | 850 μA @ 250 ksps; drops to 2 μA @ 1 ksps - enables battery-powered operation with adaptive power management. |
| INL Error | ±8 LSB max - ensures monotonicity and accurate end-point linearity across full temperature range (–40°C to +85°C). |
| SNR | 87 dB - provides >14-bit effective resolution for low-noise sensor and instrumentation front-ends. |
| Conversion Time | 2.75 μs (typ) - enables tight timing control in deterministic data acquisition loops. |
| Analog Input Range | Differential 0 V to VREF - supports direct connection to transducer outputs without gain stages when VREF ≥ 1 V. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3 mm × 3 mm, exposed pad not present, θJA = 210°C/W, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; accepts 1V to 5V externally applied voltage; must be bypassed with ≥1 μF to AGND for stability. |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance sampling node; paired with IN– for common-mode rejection; supports rail-to-rail input when IN– = GND and VREF = VCC. |
| IN– (Pin 3) | Differential Analog Input (–) | Completes differential pair; sampled simultaneously with IN+; grounding enables unipolar mode with IN+ as single-ended input. |
| GND (Pin 4) | Analog Ground | Primary ground reference for analog circuitry; must connect directly to low-impedance analog ground plane with minimal trace length. |
| CONV (Pin 5) | Convert Control Input | Rising edge starts conversion; falling edge enables SDO output; held high after conversion enters auto-sleep mode (2 μA). |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI-compatible output; 16-bit result shifted MSB-first on SCK falling edges; tri-stated when CONV is high. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports up to 20 MHz clock (H-grade); timing-critical for setup/hold compliance (15 ns min). |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; requires local 1 μF tantalum bypass to GND; noise on VCC directly impacts conversion accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces average supply current from 850 μA to 2 μA at 1 ksps - extends battery life in intermittent-sampling applications. |
| True differential input architecture | Rejects common-mode noise up to fCM = 20 MHz - eliminates need for external instrumentation amplifiers in noisy industrial environments. |
| Adjustable reference input (1V–5V) | Enables direct interfacing with low-voltage sensors (e.g., 1.25V RTD bridges) without level-shifting or gain stages. |
| Guaranteed operation to +85°C | Validated performance over full industrial temperature range - suitable for embedded systems in non-climate-controlled enclosures. |
| SPI/MICROWIRE™ compatibility | Requires no configuration registers or initialization sequence - simplifies firmware integration with microcontrollers and FPGAs. |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or environmental sensor logger powered by two AA batteries. IC Role / Device Role / Timing Role: Primary 16-bit ADC digitizing thermistor, pressure transducer, or pH electrode outputs with ratiometric reference. Use Value: 850 μA active current and 2 μA sleep current enable >1-year battery life with 1-sample-per-second duty cycle. | Use Scenario: Industrial PLC analog input module with opto-isolated digital interface to MCU. IC Role / Device Role / Timing Role: Isolated-side ADC capturing 4–20 mA loop signals or bridge sensor outputs before transmission across barrier. Use Value: Differential input and 87 dB SNR maintain 14+ ENOB despite ground potential differences and EMI in factory settings. |
| Low-Power Sensor Interface | Compact Embedded Monitoring |
Use Scenario: Wireless node measuring strain gauge or MEMS accelerometer output in structural health monitoring. IC Role / Device Role / Timing Role: Signal conditioning ADC preceding RF transceiver; samples only during wake-up intervals. Use Value: Adjustable 1V–5V VREF allows direct use of internal LDO output as reference, eliminating external reference IC and saving board space. | Use Scenario: Space-constrained medical device (e.g., wearable ECG front-end) requiring high-resolution biopotential measurement. IC Role / Device Role / Timing Role: Precision analog front-end ADC converting amplified electrode signals with minimal added noise. Use Value: 16-bit resolution and ±8 LSB INL ensure detection of sub-microvolt signal variations critical for diagnostic accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI interface, 1.8V–3.6V supply; lower power (0.5 mW @ 1 MSPS) but requires external reference and separate VREF buffer. | Targets ultra-low-power, higher-speed applications where 250 ksps is insufficient; not drop-in due to different supply voltage and pinout. | Select when system uses 1.8V/3.3V logic and needs >250 ksps - verify layout compatibility and reference drive capability. |
| MAX11100ETE+ | 16-bit, 500 ksps, internal reference (4.096V), SPI interface, 2.7V–3.6V supply; ±1 LSB INL but no differential input - only pseudo-differential. | Best for cost-sensitive, single-supply 3.3V systems needing internal reference convenience; lacks true differential rejection for noisy environments. | Choose for simplified BOM and reduced layout complexity in 3.3V designs where common-mode noise is minimal. |
Compared with ADS8860IDRCT and MAX11100ETE+, the LTC1864IMS8#PBF offers superior noise immunity via true differential inputs and seamless 5V system integration, while trading off speed and internal reference convenience for proven robustness in industrial and battery-operated deployments.
Availability
LTC1864IMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power sensor interface applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LTC1864IMS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1864IMS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-resolution measurement in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling frequency of the LTC1864IMS8#PBF?
The LTC1864IMS8#PBF achieves a maximum sampling frequency of 250 ksps under recommended operating conditions (VCC = 4.75V–5.25V, TA = –40°C to +85°C). This is supported by a typical conversion time of 2.75 μs and guaranteed timing parameters including tCONV ≤ 3.3 μs across temperature. At lower sampling rates, auto-shutdown reduces supply current proportionally - e.g., to 2 μA at 1 ksps.
Does the LTC1864IMS8#PBF require an external reference voltage?
Yes, the LTC1864IMS8#PBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1V to 5V, enabling flexible full-scale ranges. The device does not include an internal reference; using VREF = VCC yields a rail-to-rail input span when IN– is grounded. Proper bypassing (≥1 μF tantalum to GND) is mandatory to maintain accuracy and noise performance.
What is the operating temperature range for the LTC1864IMS8#PBF?
The LTC1864IMS8#PBF is specified for operation from –40°C to +85°C, denoted by the "I" grade in its part number. All key specifications - including INL (±8 LSB), SNR (87 dB), and supply current (850 μA typ at 250 ksps) - are guaranteed across this full industrial temperature range. Thermal resistance is θJA = 210°C/W in the MSOP-8 package.
How does the CONV pin function in the LTC1864IMS8#PBF?
The CONV pin (Pin 5) serves dual functions: a rising edge initiates conversion, and a falling edge enables the SDO output for serial data readout. If left high after conversion completion, the LTC1864IMS8#PBF automatically enters sleep mode, reducing supply current to 2 μA. This pin eliminates the need for separate start-conversion and data-read strobes, simplifying timing-critical firmware design.
Is the LTC1864IMS8#PBF pin-compatible with earlier 12-bit versions?
Yes, the LTC1864IMS8#PBF is pin-compatible with the 12-bit LTC1860/LTC1861 family in the same MSOP-8 package, sharing identical pinout (VREF, IN+, IN–, GND, CONV, SDO, SCK, VCC). This allows straightforward 16-bit resolution upgrades in existing designs without PCB revision - provided layout accommodates increased 16-bit timing margins and reference stability requirements.
LTC1864IMS8#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:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864IMS8#PBF FAQ
1.How can I place an order for LTC1864IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864IMS8#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 LTC1864IMS8#PBF reliable?
The price and inventory of LTC1864IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864IMS8#PBF?
LTC1864IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864IMS8#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 LTC1864IMS8#PBF?
For technical support, including LTC1864IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864IMS8#PBF requirements.
6.How does Aetrix verify that LTC1864IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864IMS8#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 LTC1864IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864IMS8#PBF?
All LTC1864IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864IMS8#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 LTC1864IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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