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Analog Devices Inc. LTC1855CG#TRPBF
- Part No.:
- LTC1855CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1855CG#TRPBF.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,194
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Product details
Overview
LTC1855CG#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™ 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 LTC1855CG#TRPBF datasheet, LTC1855CG#TRPBF pinout, LTC1855CG#TRPBF application, or LTC1855CG#TRPBF equivalent, key selection considerations include its 14-bit resolution with guaranteed monotonicity, ±30V overvoltage protection on all MUX inputs, Nap/Sleep power shutdown modes (27.5mW / 40µW), and 28-pin SSOP package compatibility with high-density PCB layouts.
Technical Context
The LTC1855CG#TRPBF employs a successive approximation register (SAR) architecture with integrated sample-and-hold, internal 2.5V bandgap reference (±10ppm/°C), and factory-trimmed 1.6384× buffer delivering 4.096V at REFCOMP. Its 8-channel analog multiplexer supports programmable single-ended or differential configurations per channel pair.
Conversion timing is governed by an internal clock trimmed to 4–5µs max conversion time, enabling 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 3V and 5V logic levels via dedicated OVDD output supply pin.
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 time |
| INL Error | ±1.5LSB - ensures monotonicity and <0.01% full-scale linearity error for calibration-sensitive systems |
| Input Range | ±10V bipolar - supports direct connection to industrial sensors without external signal conditioning |
| Overvoltage Protection | ±30V on CH0–CH7 & COM - prevents damage or data corruption during field transients or wiring faults |
| Power Dissipation | 40mW at 100ksps; 27.5mW in Nap mode; 40µW in Sleep mode - enables low-power portable or battery-backed DAQ |
| SINAD | 83dB at 1kHz - supports >13.5 effective number of bits (ENOB) for high-fidelity signal capture |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad soldered to PCB ground for thermal and noise performance.
| 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 return paths |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-protected channels; configurable as single-ended or differential pairs via software address |
| MUXOUT+ / MUXOUT– (10/11) | Multiplexer differential output | Drives ADC+ and ADC– inputs; decoupled internally to minimize crosstalk between channels |
| ADC+ / ADC– (12/13) | Differential analog input to SAR core | Accepts rescaled ±10V signals from MUXOUT; high common-mode rejection (96dB) suppresses noise |
| VREF (15) | 2.5V internal reference output | Bypassed with 1µF tantalum; used for external calibration or as precision voltage source |
| REFCOMP (16) | 4.096V buffered reference output | Drives internal DAC; supports ≤2mA DC load; requires 10µF + 0.1µF bypassing for stability |
| CONVST (28) | Conversion start trigger | Rising-edge sensitive; initiates acquisition and conversion sequence with 40ns minimum pulse width |
| BUSY (22) | Conversion status indicator | Active-low open-drain output; asserts low during conversion, releases high when result ready |
| RD (27) | Serial data read enable | Active-low control for SDO output; enables three-state operation to share bus with other peripherals |
| OVDD (21) | Digital output supply | Configures SDO/BUSY logic levels (3V or 5V); isolates output switching noise from AVDD/DVDD |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input configuration | Per-channel selection of single-ended or differential mode eliminates need for external jumpers or layout changes |
| ±30V fault protection on all MUX inputs | Prevents latch-up or parametric shift during overvoltage events without external clamping diodes |
| Internal synchronized clock | Removes requirement for external crystal or oscillator, reducing BOM count and board area |
| Three power states (Active/Nap/Sleep) | Enables dynamic power scaling: 40mW → 27.5mW → 40µW for adaptive system-level energy management |
| Channel-to-channel isolation | –120dB at 1kHz ensures minimal crosstalk between simultaneously sampled channels |
| 3V/5V logic compatible I/O | Dedicated OVDD pin allows seamless integration into mixed-voltage systems without level-shifting circuitry |
Applications
| Industrial Process Monitoring | Multiplexed Sensor Data Acquisition |
|---|---|
|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors across 8 PLC I/O modules. IC Role / Device Role / Timing Role: 14-bit ADC digitizes ±10V sensor outputs with ±30V transient immunity and 100ksps aggregate throughput. Use Value: Eliminates external protection components and reference ICs, reducing channel cost by ~35% versus discrete solutions. |
Use Scenario: High-speed logging of vibration, strain, and acoustic emissions from rotating machinery. IC Role / Device Role / Timing Role: Configurable MUX selects differential sensor pairs; SINAD of 83dB preserves signal fidelity for FFT-based diagnostics. Use Value: On-chip 2.5V reference and 1.6384× buffer deliver stable 4.096V DAC reference, removing gain drift errors in multi-channel systems. |
| PC-Based Test Equipment | DSP-Controlled Motor Drives |
|
Use Scenario: USB-connected DAQ card capturing analog feedback from lab instruments and power supplies. IC Role / Device Role / Timing Role: SPI interface synchronizes with host microcontroller; BUSY signal coordinates FIFO loading without polling overhead. Use Value: 28-pin SSOP footprint enables compact dual-layer PCB design while maintaining thermal performance via exposed pad grounding. |
Use Scenario: Real-time current and bus voltage sensing in servo amplifier feedback loops. IC Role / Device Role / Timing Role: Nap mode reduces idle power to 27.5mW during PWM dead-time; fast wake-up preserves loop timing integrity. Use Value: ±1.5LSB INL and 4µs acquisition time support closed-loop control with <100ns jitter tolerance on current-sense timing. |
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, external reference required, no ±30V fault protection | Better resolution/speed but needs external protection and reference; higher power (55mW) | Select when ENOB >14.5 bits is mandatory and overvoltage risk is mitigated externally |
| MAX11620EUB+ | 14-bit, 250ksps, ±12V input, internal reference, no MUX, 10-pin µMAX package | Single-channel only; lacks multiplexer and ±30V protection; smaller footprint but no channel flexibility | Select for space-constrained single-sensor nodes where MUX functionality is unnecessary |
Compared with ADS8684IPWR and MAX11620EUB+, the LTC1855CG#TRPBF uniquely combines 14-bit accuracy, integrated ±30V fault protection, 8-channel software-configurable MUX, and ultra-low sleep power in a single 28-pin SSOP-making it optimal for ruggedized, multi-sensor industrial DAQ where reliability and BOM simplification are prioritized over raw speed or resolution.
Availability
LTC1855CG#TRPBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and high-speed PC-based instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1855CG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1855CG#TRPBF belongs to Linear's legacy precision data acquisition product line, engineered specifically for industrial and instrumentation applications demanding robustness, accuracy, and integration in harsh electromagnetic environments.
FAQ
What is the guaranteed integral nonlinearity (INL) specification for the LTC1855CG#TRPBF over temperature?
The LTC1855CG#TRPBF guarantees ±1.5LSB INL over its full operating temperature range of 0°C to 70°C (C-grade). This specification is tested and characterized-not just typical-and applies to all 14-bit codes across the ±10V input range, ensuring monotonic behavior and predictable calibration performance in industrial environments.
Can the LTC1855CG#TRPBF operate with an external reference, and how does it affect full-scale accuracy?
Yes, the LTC1855CG#TRPBF supports external reference injection at the VREF pin. When using an external reference, full-scale error improves to ±0.14% (vs ±0.40% with internal reference), as specified in the datasheet. The internal reference remains disabled automatically when an external voltage ≥2.475V is applied, preserving system flexibility for metrology-grade applications.
How does the ±30V fault protection on CH0–CH7 function during overvoltage events?
The LTC1855CG#TRPBF uses internal clamping diodes and robust input structures to withstand ±30V on any unselected channel without affecting conversion accuracy on the selected channel. During overvoltage, current is shunted to AGND1/AGND2/AGND3, and the device recovers fully within 150ns after the fault clears-no reset or reinitialization required.
What is the minimum acquisition time required before CONVST triggers conversion on the LTC1855CG#TRPBF?
The LTC1855CG#TRPBF requires a minimum acquisition time of 1µs when sampling through CH0–CH7 inputs, as specified in the timing characteristics table. This ensures the internal sample-and-hold capacitor settles to within ½ LSB of final value. For highest accuracy, 4µs acquisition is recommended to accommodate worst-case settling under full-scale step conditions.
Is the LTC1855CG#TRPBF pin-compatible with the LTC1854CG#TRPBF or LTC1856CG#TRPBF?
Yes, the LTC1855CG#TRPBF is pin-compatible and footprint-compatible with both the LTC1854CG#TRPBF (12-bit) and LTC1856CG#TRPBF (16-bit) in the same 28-pin SSOP package. All share identical pin functions, timing, power requirements, and interface protocol-enabling resolution scalability without PCB redesign.
LTC1855CG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1855CG#TRPBF FAQ
1.How can I place an order for LTC1855CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1855CG#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 LTC1855CG#TRPBF reliable?
The price and inventory of LTC1855CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1855CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1855CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1855CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1855CG#TRPBF?
LTC1855CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1855CG#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 LTC1855CG#TRPBF?
For technical support, including LTC1855CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1855CG#TRPBF requirements.
6.How does Aetrix verify that LTC1855CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1855CG#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 LTC1855CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1855CG#TRPBF?
All LTC1855CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1855CG#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 LTC1855CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1855CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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