My Inquiry
My Account
Analog Devices Inc. LTC1856IG#TRPBF
- Part No.:
- LTC1856IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1856IG#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,857
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1856IG#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 8-channel, 100ksps analog-to-digital converter with ±10V bipolar input range, ±30V fault-protected multiplexer, and integrated 2.5V reference. It operates from a single 5V supply, delivers 87dB SINAD, ±3LSB INL, and supports SPI/MICROWIRE™ serial interface - used in industrial process control and high-speed data acquisition systems.
For engineers reviewing the LTC1856IG#TRPBF datasheet, LTC1856IG#TRPBF pinout, LTC1856IG#TRPBF application, or LTC1856IG#TRPBF equivalent, key selection considerations include its 16-bit resolution with guaranteed monotonicity, ±30V overvoltage tolerance on all MUX inputs, Nap/Sleep power shutdown modes (27.5mW / 40µW), and 28-pin SSOP package with dedicated OVDD for 3V/5V digital interfacing.
Technical Context
The LTC1856IG#TRPBF employs a successive approximation register (SAR) architecture with internal sample-and-hold and factory-trimmed 4µs conversion time. Its 8-channel analog multiplexer precedes the ADC core and includes precision resistor networks for accurate ±10V scaling, eliminating multiplexer on-resistance errors.
It integrates a curvature-corrected bandgap reference (2.50V ±10ppm/°C) and a 1.6384× buffered output (REFCOMP = 4.096V) driving the DAC. Digital interface uses separate CONVST and BUSY signals for deterministic timing, and RD-controlled SDO tri-state enables direct FIFO/DSP connection without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct codes with no missing codes across full scale. |
| Sampling Rate | 100ksps - guaranteed minimum throughput with 4µs conversion + 1µs acquisition time. |
| INL | ±3LSB - ensures end-point linearity error ≤ ±0.93mV over ±10V range, critical for calibration-sensitive systems. |
| SINAD | 87dB at 1kHz - supports >14-bit effective resolution for low-distortion signal capture. |
| Input Protection | ±30V on CH0–CH7 and COM - prevents latch-up or damage during field transients without external clamping. |
| Power Dissipation | 40mW at 100ksps; 27.5mW in Nap mode; 40µW in Sleep mode - enables low-power polling or burst-mode operation. |
| Reference | Internal 2.50V ±10ppm/°C - eliminates external reference component count while maintaining stability over –40°C to 85°C. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad soldered to PCB ground per datasheet requirement.
| 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 supporting software-programmable single-ended or differential configurations. |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer differential output | Drives ADC+ and ADC– directly; carries rescaled ±10V signal after on-chip attenuation network. |
| ADC+ / ADC– (12–13) | Differential analog input to SAR core | Accepts 2.048V p-p differential signal; high-impedance hold-mode input (4pF) minimizes sampling disturbance. |
| VREF (15) | 2.5V reference output | Provides stable 2.50V ±10ppm/°C source; requires 1µF tantalum bypass to AGND1 for noise suppression. |
| REFCOMP (16) | 4.096V reference buffer output | Drives internal DAC; supports ≤2mA DC load; bypass with 10µF + 0.1µF to AGND2 for optimal PSRR. |
| CONVST (28) | Conversion start trigger | Rising-edge initiated; initiates acquisition then conversion; minimum 40ns pulse width required. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output signaling conversion progress; synchronizes read timing with microprocessor. |
| SDO / SDI / SCK / RD (23,25,26,27) | SPI/MICROWIRE™ serial interface | 3V/5V-compatible I/O; OVDD (Pin 21) sets SDO/BUSY output swing; RD enables/disables SDO tri-state. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input configuration | Per-channel selection of single-ended or differential mode via 8-bit configuration word - enables mixed-signal channel routing without hardware change. |
| ±30V fault protection on all MUX inputs | Prevents system failure during sensor disconnect, wiring faults, or ESD events - no external TVS or clamping diodes needed. |
| Onboard 2.5V reference with 4.096V buffered output | Eliminates external reference IC and trimming components; REFCOMP drives DAC directly, reducing layout sensitivity and drift. |
| Dual power shutdown modes | Nap mode (27.5mW) retains configuration and reference bias; Sleep mode (40µW) powers down reference and clock - ideal for wake-on-event architectures. |
| Channel-to-channel isolation ≥120dB | Ensures crosstalk-free measurement when scanning multiple sensors - critical for simultaneous sampling accuracy in DAQ systems. |
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: 8-channel SAR ADC with ±30V input tolerance acquires bipolar sensor outputs and interfaces via SPI to ARM-based controller. Use Value: Fault protection eliminates need for per-channel front-end protection, reducing BOM cost by 35% versus discrete protection solutions. |
Use Scenario: High-density sensor node aggregating thermocouple, strain gauge, and voltage outputs into single data stream. IC Role / Device Role / Timing Role: 16-bit ADC with ±10V range digitizes conditioned analog signals; BUSY/CONVST enable precise timestamping of each channel. Use Value: 87dB SINAD ensures >14-bit ENOB at 1kHz, meeting Class A accuracy requirements for ISO 17025-compliant test equipment. |
| High-Speed PC-Based DAQ | Digital Signal Processing Front-End |
|
Use Scenario: USB-connected DAQ card capturing vibration spectra from rotating machinery at 100ksps across 8 channels. IC Role / Device Role / Timing Role: ADC provides synchronized sampling with Nap-mode power gating between bursts to meet thermal limits in compact enclosure. Use Value: Internal clock trimmed to 4µs max conversion time guarantees deterministic latency - essential for real-time FFT window alignment. |
Use Scenario: FPGA-based motor control system requiring precise current/voltage feedback with minimal latency. IC Role / Device Role / Timing Role: LTC1856IG#TRPBF feeds two's complement 16-bit samples directly to Xilinx Zynq PS/PL via SPI with RD-controlled SDO timing. Use Value: Dedicated OVDD pin allows 3.3V FPGA I/O compatibility without level shifters, simplifying PCB routing and signal integrity design. |
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 integrated PGA (±10.24V range); requires external reference; 1 MSPS max rate. | Higher speed but lacks ±30V fault protection; PGA adds gain flexibility but increases code latency variability. | Choose ADS8688IPWR when programmable gain is required and overvoltage risk is mitigated externally. |
| MAX11624EEE+ | 16-bit, 8-channel, SAR ADC with ±10V range; no internal reference; 250ksps; 20-pin TSSOP package. | Lower power (15mW) but requires external 2.5V reference and lacks fault protection; smaller footprint. | Choose MAX11624EEE+ for space-constrained designs where board-level protection and reference are already implemented. |
Compared with LTC1856IG#TRPBF, ADS8688IPWR offers higher throughput and PGA flexibility but demands external protection and reference design effort, while MAX11624EEE+ reduces size and power at the cost of fault resilience and reference integration - making LTC1856IG#TRPBF optimal for ruggedized, turnkey industrial DAQ.
Availability
LTC1856IG#TRPBF 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 LTC1856IG#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, formed through the acquisition of Linear Technology in 2017.
The LTC1856IG#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for industrial-grade reliability, wide-temperature operation, and integrated protection - targeting applications where measurement integrity under electrical stress is non-negotiable.
FAQ
What is the operating temperature range for the LTC1856IG#TRPBF?
The LTC1856IG#TRPBF 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 ±3LSB INL, 87dB SINAD, and ±30V fault protection - are guaranteed across this full range, making LTC1856IG#TRPBF suitable for deployment in harsh environments such as factory floors and outdoor instrumentation.
Does the LTC1856IG#TRPBF require an external reference?
No, the LTC1856IG#TRPBF includes a fully integrated, factory-trimmed 2.5V bandgap reference (VREF) and a 4.096V buffered output (REFCOMP) that drives the internal DAC. External reference is optional and only recommended when higher absolute accuracy or lower temperature drift than ±10ppm/°C is required. Using the internal reference eliminates two passive components and associated layout sensitivity in LTC1856IG#TRPBF designs.
How does the ±30V fault protection work on the LTC1856IG#TRPBF inputs?
The LTC1856IG#TRPBF implements robust ±30V fault protection on CH0–CH7 and COM pins using internal clamping structures that safely shunt overvoltage transients to AVDD or AGND without latch-up. Per datasheet Note 3, the device tolerates >100mA fault current without damage. This protection remains active even when channels are unselected - ensuring LTC1856IG#TRPBF maintains accuracy on the active channel during adjacent-channel overvoltage events.
Can the LTC1856IG#TRPBF interface directly with a 3.3V microcontroller?
Yes, the LTC1856IG#TRPBF supports 3.3V digital interfacing via its dedicated OVDD pin (Pin 21), which sets the output voltage swing of SDO and BUSY. When OVDD = 3.3V, SDO outputs valid logic levels compatible with 3.3V CMOS inputs. Digital inputs (CONVST, RD, SCK, SDI) recognize 3V logic thresholds regardless of OVDD setting - enabling seamless integration with 3.3V µCs without level-shifting circuitry in LTC1856IG#TRPBF systems.
What is the purpose of the REFCOMP pin on the LTC1856IG#TRPBF?
The REFCOMP pin (Pin 16) provides the 4.096V output of the internal reference buffer, which directly drives the DAC array in the LTC1856IG#TRPBF. It is designed for low-noise, low-impedance delivery of reference voltage and can supply up to 2mA DC load. For optimal performance, REFCOMP must be bypassed with both 10µF tantalum and 0.1µF ceramic capacitors to AGND2 - a requirement explicitly specified in the LTC1856IG#TRPBF datasheet to maintain PSRR and minimize code transition noise.
LTC1856IG#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1856IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1856IG#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 LTC1856IG#TRPBF reliable?
The price and inventory of LTC1856IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1856IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1856IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1856IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1856IG#TRPBF?
LTC1856IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1856IG#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 LTC1856IG#TRPBF?
For technical support, including LTC1856IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1856IG#TRPBF requirements.
6.How does Aetrix verify that LTC1856IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1856IG#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 LTC1856IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1856IG#TRPBF?
All LTC1856IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1856IG#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 LTC1856IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1856IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1856IG#TRPBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
