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Analog Devices Inc. LTC1856IG#PBF
- Part No.:
- LTC1856IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1856IG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
LTC1856IG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 8-channel, ±10V input successive-approximation ADC with integrated multiplexer, internal 2.5V reference, and SPI/MICROWIRE™ serial interface. It operates from a single 5V supply, delivers 100ksps sampling rate, ±3LSB integral nonlinearity, 87dB SINAD, and ±30V fault protection on all analog inputs - enabling robust data acquisition in industrial process control and high-speed PC-based systems.
For engineers reviewing the LTC1856IG#PBF datasheet, LTC1856IG#PBF pinout, LTC1856IG#PBF application, or LTC1856IG#PBF equivalent, key selection considerations include its 16-bit resolution with guaranteed no missing codes, bipolar zero error of ±23 LSB, 4µs max conversion time, 28-pin SSOP package with exposed ground pad, and support for both single-ended and differential input configurations across eight channels.
Technical Context
The LTC1856IG#PBF implements a successive-approximation register (SAR) architecture with an internal sample-and-hold circuit and factory-trimmed 5µs internal clock. Its 8-channel analog multiplexer precedes the ADC core and features on-chip resistor networks for precise ±10V input scaling and channel-specific attenuation/offset compensation.
All eight MUX inputs (CH0–CH7) and COM are fault-protected to ±30V, and overvoltage on unselected channels does not affect conversion accuracy of the selected channel. The device supports flexible digital interfacing via dedicated OVDD (3V–5V) for output swing control, RD-controlled three-state SDO, and CONVST-triggered conversion start with BUSY status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - provides 65,536 distinct output codes for high-precision measurement of small signal variations within ±10V range. |
| Sampling Rate | 100ksps - guarantees minimum 10µs cycle time per conversion, enabling real-time monitoring of fast transients in industrial control loops. |
| INL | ±3LSB - ensures end-point linearity error remains under ±920µV across full scale, critical for calibration-sensitive instrumentation. |
| SINAD | 87dB at 1kHz - corresponds to effective resolution >14.1 bits, supporting high-fidelity signal capture in DSP and spectral analysis applications. |
| Input Protection | ±30V on CH0–CH7 and COM - eliminates need for external clamping diodes or series resistors in noisy plant-floor environments. |
| Power Dissipation | 40mW at 100ksps; 27.5mW in Nap mode; 40µW in Sleep mode - enables thermally constrained embedded designs and battery-backed data loggers. |
| Reference | Internal 2.50V ±10ppm/°C bandgap reference with 4.096V buffered REFCOMP output - reduces BOM count and improves system stability vs. external references. |
Pinout & Package
Package: 28-lead plastic SSOP (G package) with exposed thermal pad soldered to PCB ground plane. Pin pitch: 0.025", body width: 0.209", JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Analog common reference | Negative reference for all single-ended inputs; must be low-noise and tied to clean analog ground plane. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-protected channels configurable as single-ended or differential pairs; 31kΩ input impedance requires low-Z drive. |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer differential output | Drives ADC+ and ADC– directly; isolates MUX errors from conversion stage via pre-MUX scaling network. |
| ADC+ / ADC– (12–13) | Core ADC differential inputs | Accept rescaled ±10V signals; 12pF sample-mode capacitance demands careful layout to minimize acquisition settling error. |
| VREF (15) | 2.5V reference output | Factory-trimmed bandgap source; requires 1µF tantalum bypass to AGND1 for low-noise operation. |
| REFCOMP (16) | 4.096V reference buffer output | Drives internal DAC; supports ≤2mA DC load but not AC loads to avoid performance degradation. |
| CONVST (28) | Conversion start trigger | Rising-edge sensitive; initiates acquisition hold and SAR conversion sequence with 40ns minimum pulse width. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output signaling ongoing conversion; used for handshaking with microcontrollers or FIFOs. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input configuration | Per-channel selection of single-ended or differential mode via 8-bit SDI command - enables mixed-signal acquisition without hardware rework. |
| Integrated ±10V input scaling | On-chip resistor dividers (R1=25kΩ, R2=17kΩ, R3=10kΩ) provide precise bipolar range with matched gain/offset across all channels. |
| Channel-to-channel isolation | –120dB at 1kHz - prevents crosstalk between simultaneously sampled channels in multi-sensor systems. |
| 3V/5V digital I/O compatibility | Dedicated OVDD pin (3V–5V) sets SDO/BUSY output swing; digital inputs accept 3V logic levels - simplifies interfacing with mixed-voltage SoCs. |
| Overvoltage recovery | 150ns recovery after ±2×FS overvoltage - maintains system uptime during transient surges without requiring reset or recalibration. |
Applications
| Industrial Process Monitoring | Multiplexed Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous voltage monitoring of 8 temperature transmitters, pressure sensors, and current loops in a PLC rack. IC Role / Device Role / Timing Role: 16-bit ADC with ±30V input protection and software-configurable MUX handles diverse sensor outputs while rejecting field-induced noise. Use Value: Eliminates external signal conditioning per channel; ±3LSB INL ensures traceable calibration against NIST standards. |
Use Scenario: Simultaneous sampling of thermocouple, strain gauge, RTD, and encoder signals in automated test equipment. IC Role / Device Role / Timing Role: Single-chip solution providing 100ksps throughput across 8 channels with programmable differential/single-ended modes. Use Value: Reduces board area by 40% vs. discrete ADC + MUX + reference; 87dB SINAD preserves dynamic range for FFT-based diagnostics. |
| PC-Based High-Speed DAQ | DSP-Front-End Signal Conditioning |
Use Scenario: USB-connected data logger capturing vibration spectra from accelerometers at 100ksps for predictive maintenance analytics. IC Role / Device Role / Timing Role: SPI-compatible ADC with BUSY/CONVST handshaking synchronizes cleanly with host CPU DMA transfers. Use Value: 4µs conversion time enables deterministic timing; internal clock removes jitter from external crystal sources. |
Use Scenario: Real-time audio and ultrasonic signal preprocessing in medical imaging systems before FPGA-based beamforming. IC Role / Device Role / Timing Role: Low-aperture-jitter (60ps) ADC feeds clean digitized waveforms to DSP for time-of-flight calculations. Use Value: 87dB SINAD and –101dB THD meet IEC 62304 Class C signal fidelity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 8-channel, SAR ADC with ±10.24V input range; uses external reference; 1MSPS max rate; 32-QFN package. | Higher speed but requires external precision reference and separate power supplies for analog/digital domains. | Choose when >100ksps sampling or lower latency is required, and board space allows larger QFN footprint and additional reference IC. |
| MAX11624EEE+ | 16-bit, 8-channel, SAR ADC with ±10V range; internal reference; 250ksps max; 24-TSSOP package; no ±30V fault protection. | Lacks input overvoltage tolerance - mandates external TVS/clamp circuits in industrial settings. | Choose for cost-sensitive consumer-grade systems where field ESD/surge risk is low and smaller TSSOP package is preferred. |
Compared with ADS8688IPWR and MAX11624EEE+, the LTC1856IG#PBF uniquely integrates ±30V fault protection, internal 2.5V reference with REFCOMP buffer, and software-selectable input topology - reducing total component count and improving reliability in harsh environments without sacrificing 16-bit accuracy.
Availability
LTC1856IG#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, high-speed PC-based DAQ, and DSP-front-end signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for LTC1856IG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1856IG#PBF belongs to Linear's precision data acquisition product line, designed specifically for industrial, instrumentation, and test equipment applications demanding high resolution, robust input protection, and simplified system integration.
FAQ
What is the operating temperature range for the LTC1856IG#PBF?
The LTC1856IG#PBF is specified for operation from –40°C to +85°C (industrial grade), as indicated by the "I" suffix in the part number. All DC and dynamic specifications - including ±3LSB INL, 87dB SINAD, and ±30V fault protection - are guaranteed across this full temperature range, making it suitable for deployment in uncontrolled industrial enclosures and outdoor equipment cabinets.
Does the LTC1856IG#PBF require an external clock source?
No, the LTC1856IG#PBF does not require an external clock source. It incorporates a factory-trimmed internal oscillator that guarantees ≤5µs conversion time and supports a fixed 100ksps sampling rate. This eliminates clock jitter concerns and reduces system-level BOM count, though external clocking is not supported - the device is designed exclusively for internal-clock operation.
Can the LTC1856IG#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1856IG#PBF supports direct interfacing with 3.3V microcontrollers. Its digital inputs (CONVST, RD, SCK, SDI) recognize 3V logic levels, and the OVDD pin can be set to 3.3V to configure SDO and BUSY outputs for 3.3V-compatible swing - enabling seamless SPI communication without level-shifting circuitry.
How is channel selection configured on the LTC1856IG#PBF?
Channel selection on the LTC1856IG#PBF is performed via an 8-bit configuration word shifted into the SDI pin during the first eight SCK rising edges before CONVST assertion. Bits define single-ended/differential mode, channel address (CH0–CH7 or COM), and power-down state. This software-programmable method eliminates jumpers or external logic, allowing dynamic reconfiguration in firmware.
What decoupling is required for the VREF and REFCOMP pins of the LTC1856IG#PBF?
The VREF pin (Pin 15) requires a 1µF tantalum capacitor to AGND1, and the REFCOMP pin (Pin 16) requires both a 10µF tantalum and a 0.1µF ceramic capacitor to AGND2. These values are specified in the datasheet to suppress wideband noise and maintain reference stability - insufficient decoupling directly degrades INL, SINAD, and THD performance.
LTC1856IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1856IG#PBF FAQ
1.How can I place an order for LTC1856IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1856IG#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 LTC1856IG#PBF reliable?
The price and inventory of LTC1856IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1856IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1856IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1856IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1856IG#PBF?
LTC1856IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1856IG#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 LTC1856IG#PBF?
For technical support, including LTC1856IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1856IG#PBF requirements.
6.How does Aetrix verify that LTC1856IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1856IG#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 LTC1856IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1856IG#PBF?
All LTC1856IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1856IG#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 LTC1856IG#PBF part is unused and in its original packaging.
Return procedure for LTC1856IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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