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Analog Devices Inc. LTC1855IG#TRPBF
- Part No.:
- LTC1855IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1855IG#TRPBF.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
LTC1855IG#TRPBF 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 integral nonlinearity for precision industrial data acquisition.
For engineers reviewing the LTC1855IG#TRPBF datasheet, LTC1855IG#TRPBF pinout, LTC1855IG#TRPBF application, or LTC1855IG#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for volume procurement and BOM continuity.
Technical Context
The LTC1855IG#TRPBF implements a successive approximation register (SAR) architecture with integrated sample-and-hold, internal 2.5V bandgap reference, and factory-trimmed 1.6384× buffer delivering 4.096V at REFCOMP. Its 8-channel analog multiplexer supports programmable single-ended or differential inputs per channel pair, with all inputs fault-protected to ±30V independent of selection state.
Conversion timing is governed by an internal synchronized clock ensuring ≤5µs conversion time and guaranteed 100ksps throughput. Digital interface uses SPI-compatible 3-wire serial I/O (SDI/SCK/SDO) with active-low RD control and BUSY status flag, supporting both continuous-read and burst-read modes while maintaining 3V/5V I/O compatibility via dedicated OVDD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes with two's complement format for ±10V full-scale range. |
| Sampling Rate | 100ksps - guarantees minimum 10µs cycle time for real-time control loop sampling in industrial PLCs. |
| INL Error | ±1.5LSB - ensures <±0.75mV absolute linearity error over ±10V range, critical for calibrated sensor interfaces. |
| SINAD | 83dB at 1kHz - enables >13.5 effective number of bits (ENOB) for high-fidelity signal capture in DSP front-ends. |
| Input Protection | ±30V on all MUX channels - eliminates need for external clamping diodes in harsh industrial environments. |
| Power Dissipation | 40mW at 100ksps - allows thermal design without heatsinking in dense PCB layouts. |
| Reference | Internal 2.50V ±10ppm/°C - reduces BOM count by eliminating external reference IC and trimming components. |
Pinout & Package
Package: 28-pin SSOP (G package), exposed pad soldered to PCB ground for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Analog common reference | Ground reference for all single-ended inputs; must connect to low-noise analog ground plane. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-protected channels accepting ±10V bipolar signals; resistor-divider network enables precise scaling. |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer differential output | Drives ADC+ and ADC– inputs; isolates conversion stage from MUX switching transients. |
| ADC+ / ADC– (12–13) | Differential ADC input | High-impedance inputs to SAR core; accept rescaled signals from MUXOUT for accurate 14-bit conversion. |
| VREF (15) | 2.5V reference output | Provides stable internal reference; requires 1µF tantalum bypass to AGND1 for low-noise operation. |
| REFCOMP (16) | 4.096V buffered reference | Drives internal DAC; supports ≤2mA DC load but not AC loads to avoid performance degradation. |
| CONVST (28) | Conversion start trigger | Rising-edge initiated; minimum 40ns pulse width required to enter hold mode and begin conversion. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output signaling conversion in progress; used for handshaking with microcontrollers. |
| RD (27) | Serial data read enable | Active-low control enabling SDO output; when high, SDO enters high-impedance state for bus sharing. |
| OVDD (21) | Digital output supply | Configures SDO and BUSY logic levels for 3V or 5V systems independently of AVDD/DVDD supplies. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input configuration | Select single-ended or differential mode per channel pair via 8-bit SDI command, eliminating hardware jumpers. |
| ±30V fault protection on all inputs | Prevents latch-up and maintains accuracy during transient overvoltage events without external protection circuitry. |
| Nap and Sleep power shutdown modes | Reduces current to 8mA (Nap) or 7µA (Sleep), enabling low-power wake-on-event architectures in remote sensors. |
| Channel-to-channel isolation ≥120dB | Minimizes crosstalk between simultaneously sampled channels in multi-sensor monitoring applications. |
| Onboard precision reference with tempco | ±10ppm/°C drift ensures stable full-scale calibration across –40°C to +85°C industrial temperature range. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 process lines in a chemical plant control cabinet. IC Role / Device Role / Timing Role: 14-bit ADC digitizing ±10V sensor outputs with channel-isolated sampling and ±30V surge tolerance on field wiring. Use Value: Eliminates external protection diodes and reference ICs, reducing board area by 35% and calibration labor by 50% versus discrete solutions. | Use Scenario: High-density DAQ module for test benches acquiring synchronized voltage/current waveforms from multiple DUTs. IC Role / Device Role / Timing Role: 100ksps 8-channel SAR ADC with BUSY-driven interrupt signaling for deterministic microcontroller polling. Use Value: Achieves 10µs inter-channel skew and <±0.75mV INL, enabling sub-0.1% measurement accuracy without per-channel trimming. |
| High Speed Data Acquisition for PCs | Digital Signal Processing |
Use Scenario: USB-connected oscilloscope front-end capturing 100ksps waveform data from lab equipment with ±10V dynamic range. IC Role / Device Role / Timing Role: SPI-interfaced ADC feeding FPGA-based decimation filter with RD-controlled data streaming. Use Value: Internal 2.5V reference and 83dB SINAD ensure consistent ENOB across units, simplifying factory calibration and reducing test time. | Use Scenario: Real-time vibration analysis system using FFT on motor current signatures sampled at 100ksps. IC Role / Device Role / Timing Role: Low-noise 14-bit ADC providing clean input to TI C6000 DSP with minimal aperture jitter (60ps). Use Value: 120dB channel isolation prevents spectral leakage between phase-current channels, improving fault detection sensitivity by 12dB. |
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 resolution, 500ksps, SPI interface, no internal reference - requires external 4.096V reference and driver op-amp. | Higher resolution and speed but larger PCB footprint and higher power (120mW); lacks ±30V fault protection. | Choose ADS8684IPWR when ENOB >14.5 bits and sampling rate >150ksps are mandatory; accept added BOM cost and layout complexity. |
| MAX11620ATI+ | 14-bit, 100ksps, 8-channel, internal reference, but only ±5V input range and ±15V fault protection. | Lower input voltage range limits use with legacy ±10V industrial sensors; smaller 20-pin TQFN package. | Choose MAX11620ATI+ for space-constrained designs where ±5V sensor compatibility is sufficient and fault margin can be reduced. |
Compared with LTC1855IG#TRPBF, ADS8684IPWR offers higher speed and resolution at the cost of increased power and external component dependency, while MAX11620ATI+ trades input range and fault tolerance for compact packaging-making LTC1855IG#TRPBF optimal for ±10V industrial systems requiring robustness and integration.
Availability
LTC1855IG#TRPBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, high-speed PC-based DAQ, and digital signal processing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1855IG#TRPBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1855IG#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for industrial-grade multichannel ADC applications demanding ±10V bipolar input, fault tolerance, and integrated reference stability.
FAQ
What is the operating temperature range for the LTC1855IG#TRPBF?
The LTC1855IG#TRPBF is rated for industrial operation from –40°C to +85°C (I-grade). This range is validated across all electrical specifications including ±1.5LSB INL, 83dB SINAD, and ±30V fault protection, making LTC1855IG#TRPBF suitable for deployment in uncontrolled factory environments and outdoor control cabinets without derating.
Does the LTC1855IG#TRPBF require an external reference voltage?
No, the LTC1855IG#TRPBF includes a factory-trimmed 2.50V ±10ppm/°C internal reference accessible at VREF (Pin 15) and a 4.096V buffered output at REFCOMP (Pin 16). External reference is optional and only recommended when absolute accuracy better than ±0.45% full-scale error is required; LTC1855IG#TRPBF achieves ±0.40% full-scale error with internal reference.
How does the ±30V fault protection work on the LTC1855IG#TRPBF inputs?
The LTC1855IG#TRPBF uses internal clamping diodes and robust input structures that safely shunt currents exceeding ±30V on CH0–CH7 and COM pins without latch-up or parametric shift. This protection remains active regardless of channel selection state, so a fault on an unselected channel does not affect conversion accuracy on the selected channel-verified per Absolute Maximum Ratings table in the LTC1855IG#TRPBF datasheet.
Can the LTC1855IG#TRPBF interface directly with a 3.3V microcontroller?
Yes, the LTC1855IG#TRPBF supports 3V/5V mixed-signal interfacing: digital inputs (CONVST, RD, SCK, SDI) recognize 3V logic levels, and the dedicated OVDD pin (Pin 21) sets SDO/BUSY output swing to 3.3V when supplied with 3.3V-enabling direct connection to 3.3V MCUs without level shifters, while maintaining full 14-bit performance and timing compliance.
What is the purpose of the REFCOMP pin on the LTC1855IG#TRPBF?
The REFCOMP pin (Pin 16) provides the 4.096V output of the internal reference buffer, which drives the ADC's capacitive DAC. It is designed for low-noise DC loading (<2mA); driving AC loads degrades SINAD and THD. For LTC1855IG#TRPBF designs, REFCOMP must be bypassed with 10µF tantalum + 0.1µF ceramic to AGND2, and never used as a general-purpose voltage source.
LTC1855IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1855IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1855IG#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1855IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1855IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1855IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1855IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1855IG#TRPBF?
LTC1855IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1855IG#TRPBF 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#TRPBF?
For technical support, including LTC1855IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1855IG#TRPBF requirements.
6.How does Aetrix verify that LTC1855IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1855IG#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1855IG#TRPBF?
All LTC1855IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1855IG#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1855IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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