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Analog Devices Inc. LTC1864ACS8#PBF
- Part No.:
- LTC1864ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864ACS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:115
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Product details
Overview
LTC1864ACS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps single-channel differential successive approximation ADC in an 8-lead SOIC package, operating on a single 5V supply with 850μA typical supply current 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 0°C to 70°C - ideal for compact, battery-powered data acquisition systems requiring high resolution without external gain stages.
For engineers reviewing the LTC1864ACS8#PBF datasheet, LTC1864ACS8#PBF pinout, LTC1864ACS8#PBF application, or LTC1864ACS8#PBF equivalent, key selection criteria include its 16-bit no-missing-codes performance, 87dB SNR, ±6 LSB INL (A-grade), 2.75μs conversion time, and rail-to-rail input capability when VREF = VCC - critical for precision ratiometric sensing, isolated telemetry, and portable instrumentation where power, size, and DC accuracy are constrained.
Technical Context
The LTC1864ACS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion at up to 250ksps while maintaining low power via automatic sleep between conversions. Its differential input stage rejects common-mode noise, and the adjustable VREF pin supports full-scale spans from 1V to 5V, allowing direct connection to transducers and op-amp outputs without level-shifting.
It uses a 3-wire SPI-compatible serial interface (CONV, SCK, SDO) with CONV acting as both conversion trigger and output enable: a falling edge initiates data readout, and sustained high state forces sleep mode. The SO-8 package ties VREF internally to VCC in the LTC1864 variant, simplifying design for ratiometric applications where reference tracking is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high-fidelity signal digitization in precision measurement. |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz full-linear bandwidth (S/(N+D) ≥ 75dB). |
| Supply Current | 850μA typ at 250ksps; drops to 2μA at 1ksps - enables multi-year battery life in low-duty-cycle sensor nodes. |
| INL (A-grade) | ±6 LSB max - ensures monotonicity and <0.1% full-scale linearity error for calibration-sensitive applications. |
| SNR | 87dB - provides >14 effective bits of dynamic resolution for clean low-noise signal acquisition. |
| Conversion Time | 2.75μs typ - allows tight timing control in synchronized sampling systems and fast loop closure. |
| Input Range | 0V to VREF differential - supports direct interfacing with bridge sensors, current shunts, and instrumentation amplifiers. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 3.9mm × 4.9mm body, standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale range; tied internally to VCC in SO-8 package - enables ratiometric operation with supply voltage drift compensation. |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance input accepting 0V to VREF relative to IN–; rejects common-mode noise when paired with IN–. |
| IN– (Pin 3) | Differential Analog Input (–) | Completes differential pair; grounding IN– yields unipolar 0V–VREF input span on IN+. |
| GND (Pin 4) | Analog Ground | Single ground reference for analog section; must connect directly to low-impedance analog ground plane. |
| CONV (Pin 5) | Convert Control | Rising edge starts conversion; falling edge enables SDO output; high state after conversion triggers auto-sleep. |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI-compatible output; 16-bit result shifted out MSB-first on SCK falling edge. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports up to 20MHz clock (H-grade) for minimal readout latency. |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; requires local 1μF tantalum bypass to GND for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Shutdown | Reduces supply current to 2μA at 1ksps - eliminates need for external power-gating circuitry in intermittent sampling. |
| True Differential Input | Rejects common-mode noise up to full bandwidth - improves immunity in noisy industrial or motor-control environments. |
| Rail-to-Rail Input Span | Supports 0V to VCC input when VREF = VCC - removes requirement for external level-shifting or gain stages. |
| No Missing Codes | Guaranteed over full temperature range - ensures monotonic response critical for closed-loop control and position feedback. |
| 16-Bit Upgrade Path | PIN-compatible with 12-bit LTC1860/LTC1861 - allows resolution upgrade without PCB redesign. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered ECG front-end digitizing microvolt-level biopotentials with high common-mode rejection. IC Role / Device Role / Timing Role: Precision 16-bit ADC capturing differential lead signals at 250ksps with auto-sleep between heartbeats. Use Value: 87dB SNR and ±6 LSB INL ensure diagnostic-grade waveform fidelity; 850μA active current extends AA battery life beyond 12 months. | Use Scenario: Remote RTD/thermocouple transmitter in hazardous area with intrinsic safety constraints. IC Role / Device Role / Timing Role: Isolated analog input conditioner converting sensor voltage to digital stream for 4–20mA loop or wireless transmission. Use Value: Differential input rejects 50/60Hz pickup; 1V–5V VREF flexibility accommodates diverse sensor excitation schemes without external DACs. |
| Energy Metering Subsystem | Test & Measurement Equipment |
Use Scenario: High-accuracy watt-hour calculation using shunt-based current sensing and voltage divider inputs. IC Role / Device Role / Timing Role: Dual-channel (via external MUX) simultaneous sampling ADC for voltage/current phase alignment. Use Value: 2.75μs conversion time enables sub-cycle sampling; ratiometric operation cancels supply drift impact on metrology accuracy. | Use Scenario: Handheld oscilloscope or spectrum analyzer requiring compact, low-power front-end digitization. IC Role / Device Role / Timing Role: Primary ADC in portable DSO capturing transient waveforms up to 125kHz linear bandwidth. Use Value: 87dB SNR and 83dB SINAD at 10kHz support >13.5 ENOB; SO-8 package fits dense PCB layouts with minimal thermal mass. |
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 |
|---|---|---|---|
| ADS8325IDR | 16-bit, 100ksps, 2.7–5.5V supply, SPI interface, 1.5mW @ 100ksps | Lower speed and power; no auto-shutdown; requires external reference | Preferred for ultra-low-power (<100μA) sub-100ksps applications where conversion latency is non-critical. |
| MAX11156EUB+ | 16-bit, 500ksps, 2.7–3.6V supply, internal reference, 2.5mW @ 500ksps | Higher speed but narrower supply range; fixed 2.5V ref limits ratiometric use | Selected when higher throughput is needed and system operates from 3.3V only, with no requirement for VREF tracking. |
Compared with ADS8325IDR and MAX11156EUB+, the LTC1864ACS8#PBF uniquely balances 250ksps speed, 5V single-supply operation, auto-shutdown, and internal VREF-to-VCC coupling - making it optimal for cost-sensitive, battery-operated 5V systems needing guaranteed ratiometric accuracy without layout changes.
Availability
LTC1864ACS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and energy metering subsystems requiring stable component supply across extended production lifecycles.
Supply support for LTC1864ACS8#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 LTC1864ACS8#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 rate supported by the LTC1864ACS8#PBF?
The LTC1864ACS8#PBF supports a maximum sampling rate of 250ksps at 25°C and 5V supply. This is achieved with a minimum conversion time of 2.75μs and requires SCK frequency ≤20MHz. At elevated temperatures (up to +70°C), the maximum rate remains 250ksps for the A-grade version, as confirmed in the Recommended Operating Conditions table.
Does the LTC1864ACS8#PBF require an external reference voltage?
No - the LTC1864ACS8#PBF SO-8 variant ties VREF internally to VCC, enabling fully ratiometric operation without external components. This eliminates reference drift errors and reduces BOM count. External VREF is only required for non-ratiometric applications or when a different full-scale span (1V–5V) is needed, though the SO-8 package does not support independent VREF connection.
What is the meaning of "A-grade" in LTC1864ACS8#PBF?
The "A" in LTC1864ACS8#PBF denotes the commercial temperature grade (0°C to +70°C) and specifies tighter DC accuracy: ±6 LSB maximum INL and ±2 mV offset error (vs. ±8 LSB and ±3 mV for standard C-grade). This grade is validated per the device's Electrical Characteristics table and applies across the full 0°C–70°C range.
Can the LTC1864ACS8#PBF interface directly with a microcontroller SPI port?
Yes - the LTC1864ACS8#PBF uses a 3-wire SPI/MICROWIRE-compatible interface (CONV, SCK, SDO) with no SDI pin. It operates in master-in-slave-out (MISO) mode: the microcontroller generates SCK and asserts CONV, then reads 16 bits from SDO on SCK falling edges. No level-shifting is needed for 5V-tolerant MCUs, and timing meets standard SPI setup/hold requirements.
How does the auto-shutdown feature reduce power in the LTC1864ACS8#PBF?
The LTC1864ACS8#PBF automatically enters sleep mode when CONV remains high after conversion completion, reducing supply current from 850μA (250ksps) to just 2μA at 1ksps. This occurs without software intervention or external control signals - the internal logic detects idle state and gates bias currents, making it ideal for event-triggered or burst-mode acquisition.
LTC1864ACS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864ACS8#PBF FAQ
1.How can I place an order for LTC1864ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864ACS8#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 LTC1864ACS8#PBF reliable?
The price and inventory of LTC1864ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864ACS8#PBF?
LTC1864ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864ACS8#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 LTC1864ACS8#PBF?
For technical support, including LTC1864ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864ACS8#PBF requirements.
6.How does Aetrix verify that LTC1864ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864ACS8#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 LTC1864ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864ACS8#PBF?
All LTC1864ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864ACS8#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 LTC1864ACS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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