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Analog Devices Inc. LTC1855IG#PBF
- Part No.:
- LTC1855IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1855IG#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,144
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Product details
Overview
LTC1855IG#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 8-channel, 100ksps analog-to-digital converter with ±10V bipolar input range, ±30V fault-protected multiplexer, and SPI/MICROWIRE™-compatible serial interface. It operates from a single 5V supply, features internal 2.5V reference and synchronized clock, and delivers ±1.5LSB INL for precision industrial data acquisition.
For engineers reviewing the LTC1855IG#PBF datasheet, LTC1855IG#PBF pinout, LTC1855IG#PBF application, or LTC1855IG#PBF equivalent, key selection considerations include its 14-bit resolution, ±10V input range with ±30V overvoltage tolerance, 87dB SINAD at 1kHz, Nap/Sleep power shutdown modes (27.5mW / 40µW), and 28-pin SSOP package with dedicated OVDD for 3V/5V digital interfacing.
Technical Context
The LTC1855IG#PBF implements a successive approximation register (SAR) architecture with integrated sample-and-hold, internal 2.5V bandgap reference (±10ppm/°C), and 1.6384× buffered REFCOMP output (4.096V). Its 8-channel analog multiplexer supports programmable single-ended or differential configurations per channel pair, with all inputs fault-protected to ±30V independent of channel selection.
Conversion is initiated by CONVST rising edge, with guaranteed 4–5µs conversion time and 100ksps throughput. Serial interface uses SCK up to 20MHz (falling-edge capture), RD-controlled three-state SDO, and BUSY status signaling - enabling direct connection to microprocessors, DSPs, and FIFOs without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct codes across ±10V full-scale range (305.2µV/LSB). |
| Sampling Rate | 100ksps - guaranteed minimum throughput with 4µs acquisition + 5µs conversion timing. |
| INL Error | ±1.5LSB - ensures monotonicity and <0.01% full-scale linearity error for calibrated systems. |
| SINAD | 83dB at 1kHz - enables >13.5 effective number of bits (ENOB) in low-distortion signal chains. |
| Power Dissipation | 40mW at 100ksps - reduces thermal drift and simplifies thermal management in dense PCB layouts. |
| Input Protection | ±30V on all MUX channels - eliminates need for external clamping diodes or protection circuitry. |
| Reference | Internal 2.50V ±10ppm/°C - eliminates external reference component while maintaining stability over –40°C to +85°C. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad soldered to PCB ground for thermal and noise performance. Pin pitch: 0.65mm. Body dimensions: 10.2mm × 5.3mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Low-noise analog ground reference point; must be isolated from digital ground and routed directly to AGND1. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-tolerant inputs supporting software-programmable single-ended or differential pairs. |
| MUXOUT+ / MUXOUT– (10/11) | Differential multiplexer outputs | Drive ADC+ and ADC–; internal rescaling ensures accurate ±10V range regardless of channel configuration. |
| ADC+ / ADC– (12/13) | Differential analog inputs to SAR core | Accept rescaled signals from MUXOUT; high-impedance node requiring local 12pF hold-mode capacitance. |
| VREF (15) | 2.5V internal reference output | Bypass with 1µF tantalum to AGND1; used for external calibration or as precision voltage source. |
| REFCOMP (16) | 4.096V buffered reference output | Drives internal DAC; supports ≤2mA DC load; bypass with 10µF + 0.1µF for low-noise operation. |
| CONVST (28) | Conversion start trigger | Rising-edge sensitive; initiates acquisition and conversion sequence with 40ns minimum pulse width. |
| RD (27) | Serial data read enable | Active-low control for SDO three-state output; enables synchronous read after BUSY deassertion. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input configuration | Per-channel selection of single-ended or differential mode via 8-bit SDI command - eliminates hardware jumpers and simplifies firmware-driven channel setup. |
| ±30V fault protection on all inputs | Prevents damage and cross-talk during sensor overvoltage events (e.g., thermocouple open-circuit, motor back-EMF), preserving accuracy on active channels. |
| Dual power shutdown modes | Nap mode (27.5mW) and Sleep mode (40µW) reduce idle power by >99%, enabling battery-powered or energy-sensitive DAQ systems. |
| Dedicated OVDD supply (3V–5V) | Allows SDO and BUSY outputs to interface directly with 3V logic families without level shifters - critical for mixed-voltage embedded designs. |
| Channel-to-channel isolation | –120dB at 1kHz - prevents crosstalk between simultaneously sampled channels in multi-sensor monitoring applications. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O modules using shared ADC resources. IC Role / Device Role / Timing Role: 14-bit SAR ADC with ±10V range and ±30V fault tolerance serves as central digitizer for analog sensor array. Use Value: Eliminates per-channel signal conditioning, reduces BOM count by 75%, and maintains ±0.02% full-scale accuracy across –40°C to +85°C operating range. |
Use Scenario: High-density test equipment acquiring synchronized voltage/current waveforms from multiple DUTs. IC Role / Device Role / Timing Role: 100ksps sampling ADC with programmable MUX and BUSY/CONVST timing controls real-time waveform capture. Use Value: Enables deterministic 10µs inter-sample interval with no external timing components, reducing jitter-induced ENOB loss. |
| High-Speed PC-Based DAQ | Digital Signal Processing Front-End |
Use Scenario: USB-connected data logger capturing vibration spectra from accelerometers and strain gauges. IC Role / Device Role / Timing Role: SPI-compatible ADC interfaces directly to microcontroller's hardware SPI peripheral with RD/BUSY handshaking. Use Value: Achieves 100ksps sustained throughput over USB 2.0 with zero CPU polling overhead due to BUSY-driven interrupt operation. |
Use Scenario: Real-time audio analysis system performing FFT on conditioned microphone and line-level inputs. IC Role / Device Role / Timing Role: Low-noise 14-bit ADC with 83dB SINAD provides clean input to fixed-point DSP engine. Use Value: Delivers >13.5 ENOB at 1kHz, meeting AES17 standard for professional audio measurement equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8684IPWR | 16-bit, 100ksps, ±10.24V range, internal reference ±2ppm/°C, SPI interface, 32-QFN package | Higher resolution and better reference stability; requires external overvoltage protection beyond ±12V | Select when absolute accuracy <±0.005% FS is required and board space allows QFN layout. |
| MAX11620AUB+ | 14-bit, 250ksps, ±10V range, no internal reference (requires external REF), 10-µMAX package | Faster sampling but lacks integrated reference and fault protection; smaller footprint | Select for cost-sensitive, space-constrained designs where external reference and protection are already present. |
Compared with LTC1855IG#PBF, ADS8684IPWR offers higher resolution and tighter reference drift but adds external protection complexity, while MAX11620AUB+ trades integrated features for speed and size - making LTC1855IG#PBF optimal for balanced industrial DAQ where fault resilience and reference integration are prioritized.
Availability
LTC1855IG#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and high-speed PC-based DAQ requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to +85°C operation.
Supply support for LTC1855IG#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 LTC1855IG#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for rugged, multichannel industrial sensing applications demanding fault tolerance, wide input range, and integrated reference stability.
FAQ
What is the operating temperature range for the LTC1855IG#PBF?
The LTC1855IG#PBF is rated for industrial temperature operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number. All DC and dynamic specifications - including ±1.5LSB INL, 83dB SINAD, and ±30V fault protection - are guaranteed across this full range, making it suitable for harsh environments like factory automation and outdoor instrumentation.
Does the LTC1855IG#PBF require an external reference?
No, the LTC1855IG#PBF includes a factory-trimmed 2.50V internal reference (±10ppm/°C) and a 4.096V buffered REFCOMP output, eliminating the need for external reference components in most applications. An external reference can be applied to VREF only if higher accuracy or custom full-scale range is required - the internal reference remains functional unless overdriven.
How does the ±30V fault protection work on the LTC1855IG#PBF inputs?
The LTC1855IG#PBF uses internal clamping diodes and robust input structures to withstand ±30V on CH0–CH7 and COM pins - even when unselected - without latch-up or performance degradation. This protection is intrinsic to the silicon design and requires no external components. A fault on one channel has no effect on conversion results of other channels, ensuring system reliability in noisy industrial settings.
Can the LTC1855IG#PBF interface with 3V microcontrollers?
Yes, the LTC1855IG#PBF supports 3V digital interfacing via its dedicated OVDD pin (Pin 21), which sets the output swing of SDO and BUSY. Digital inputs (CONVST, RD, SCK, SDI) accept 3V logic levels directly. With OVDD = 3V, SDO outputs valid 3V-compatible signals, enabling seamless integration with ARM Cortex-M0/M3, PIC, or RISC-V microcontrollers without level-shifting circuitry.
What is the significance of the "#PBF" suffix in LTC1855IG#PBF?
The "#PBF" suffix indicates that the LTC1855IG#PBF is a lead-free (Pb-free) RoHS-compliant version, with matte tin surface finish on leads and compatible with standard SnPb and lead-free reflow profiles. It replaces legacy leaded versions and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements, ensuring reliable assembly in modern electronics manufacturing.
LTC1855IG#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:
- 14
- 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:
- -
LTC1855IG#PBF FAQ
1.How can I place an order for LTC1855IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1855IG#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 LTC1855IG#PBF reliable?
The price and inventory of LTC1855IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1855IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1855IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1855IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1855IG#PBF?
LTC1855IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1855IG#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 LTC1855IG#PBF?
For technical support, including LTC1855IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1855IG#PBF requirements.
6.How does Aetrix verify that LTC1855IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1855IG#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 LTC1855IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1855IG#PBF?
All LTC1855IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1855IG#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 LTC1855IG#PBF part is unused and in its original packaging.
Return procedure for LTC1855IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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