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Analog Devices Inc. LTC1859IG#TRPBF
- Part No.:
- LTC1859IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1859IG#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,111
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Product details
Overview
LTC1859IG#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 8-channel, 100ksps software-programmable analog-to-digital converter with ±25V fault-protected inputs, single 5V supply operation, ±3LSB integral nonlinearity, and SPI/MICROWIRE-compatible serial interface - used in industrial process control data acquisition systems requiring high channel density and flexible input range configuration.
For engineers reviewing the LTC1859IG#TRPBF datasheet, LTC1859IG#TRPBF pinout, LTC1859IG#TRPBF application, or LTC1859IG#TRPBF equivalent, key selection criteria include its SoftSpan™ programmable input ranges (0V–5V/0V–10V/±5V/±10V), differential/single-ended channel configuration, ±25V overvoltage protection per channel, 87dB SNR, and 28-pin SSOP industrial-grade packaging.
Technical Context
The LTC1859IG#TRPBF implements a successive approximation register (SAR) architecture with an integrated sample-and-hold, factory-trimmed 2.5V bandgap reference, and internal 1.6384× gain buffer delivering 4.096V at REFCOMP. Its SoftSpan™ input scaling network precedes the 8-channel multiplexer to eliminate multiplexer on-resistance errors.
Conversion is initiated by CONVST rising edge; BUSY indicates active conversion; serial output is clocked via SCK with RD-controlled SDO enable. Input ranges and channel configuration are selected via 8-bit command word written to SDI before conversion start, enabling per-channel unipolar/bipolar and single-ended/differential mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high-precision measurement of small signal variations. |
| Sampling Rate | 100ksps - supports real-time monitoring of fast transients in motor control or power quality applications. |
| INL | ±3LSB - ensures monotonicity and <0.005% full-scale linearity error across ±10V input range. |
| SNR | 87dB (typ) - enables >14-bit effective resolution for low-noise sensor interfacing and vibration analysis. |
| Input Protection | ±25V fault tolerance on all CH0–CH7 and COM pins - eliminates need for external clamping in harsh industrial environments. |
| Power Dissipation | 40mW (typ) - allows dense PCB layouts without forced cooling in enclosed industrial enclosures. |
| Reference | Internal 2.5V ±10ppm/°C reference with 4.096V buffered REFCOMP output - supports ratiometric or absolute measurements without external components. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be low-noise analog ground connection; defines zero point for all CH0–CH7 unipolar measurements. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±25V fault-protected; software-configurable as single-ended or differential pairs; impedance 42kΩ (unipolar)/31kΩ (bipolar). |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer output differential pair | Drives ADC+ and ADC–; rescaled by on-chip SoftSpan™ attenuator network prior to conversion. |
| ADC+ / ADC– (12–13) | Differential analog input to SAR core | Accepts 0V–2.048V/±1.024V or 0V–4.096V/±2.048V ranges; high-impedance (Hi-Z) during hold phase. |
| VREF (15) | 2.5V internal reference output | Bypass with 1µF tantalum to AGND1; can be overdriven by external reference for improved accuracy. |
| REFCOMP (16) | 4.096V buffered reference output | Drives internal DAC; supports ≤2mA DC load; bypass with 10µF + 0.1µF to AGND2/AGND3. |
| CONVST (28) | Active-high conversion start trigger | Rising edge initiates acquisition and conversion; minimum 40ns pulse width required. |
| BUSY (22) | Open-drain conversion status indicator | Low during conversion; synchronizes host read timing without polling overhead. |
| SDO / SDI / SCK / RD (23,25,26,27) | SPI/MICROWIRE-compatible serial interface | 3V/5V-tolerant; supports up to 20MHz SCK; RD enables SDO output; SDI accepts 8-bit command word pre-conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input spans | Per-channel selection of 0V–5V, 0V–10V, ±5V, or ±10V via 8-bit command - eliminates hardware reconfiguration for multi-sensor systems. |
| Fault-protected analog inputs | ±25V continuous tolerance on all 8 channels and COM - prevents latch-up and maintains accuracy during field wiring faults. |
| Integrated precision reference | Factory-trimmed 2.5V ±10ppm/°C bandgap with 4.096V buffered output - removes need for external voltage references in most applications. |
| Two shutdown modes | Nap mode (8mA) and Sleep mode (5.5µA) - reduces system power by >99% during idle periods in battery-backed DAQ systems. |
| Channel-to-channel isolation | –120dB at 1kHz - enables simultaneous sampling of high- and low-level signals (e.g., current + voltage) without crosstalk. |
Applications
| Industrial Process Monitoring | Programmable Logic Controller I/O Modules |
|---|---|
|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs across multiple plant zones with varying signal ranges (4–20mA, ±10V, 0–5V). IC Role / Device Role / Timing Role: 8-channel SoftSpan™ ADC performs per-sensor range auto-configuration and digitizes all inputs at 100ksps with synchronized sampling. Use Value: Eliminates external signal conditioning per channel, reducing BOM cost by 35% and board area by 40% versus discrete op-amp + ADC solutions. |
Use Scenario: Modular PLC backplane with hot-swappable analog input cards supporting mixed unipolar/bipolar field devices. IC Role / Device Role / Timing Role: LTC1859IG#TRPBF serves as the primary ADC with ±25V input protection and SPI interface to FPGA-based controller. Use Value: Enables single-card support for 4–20mA transmitters, thermocouples, and strain gauges without jumper settings or manual calibration. |
| High-Speed PC-Based Data Acquisition | DSP-Front-End for Motor Control Systems |
|
Use Scenario: USB-connected DAQ device capturing vibration spectra from accelerometers and acoustic emissions from bearings. IC Role / Device Role / Timing Role: 16-bit resolution and 87dB SNR provide >14-bit ENOB for FFT-based spectral analysis at 100ksps. Use Value: Delivers laboratory-grade dynamic performance in compact, fanless desktop instruments without external anti-aliasing filters. |
Use Scenario: Real-time current and bus voltage sensing in servo drives with fast fault detection (<1µs overvoltage recovery). IC Role / Device Role / Timing Role: Simultaneous sampling of phase currents and DC-link voltage using differential and single-ended configurations. Use Value: Enables precise field-oriented control (FOC) with <100ns aperture jitter and deterministic 5µs max conversion time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, programmable-range ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606BSTZ | 16-bit, 8-channel, ±10V fixed range, parallel + SPI interface, 200ksps, no software-programmable spans | Requires external level-shifting for 0–5V sensors; higher power (120mW); larger 64-lead LQFP package | Select when maximum throughput (200ksps) and parallel interface are required; avoid when mixed input ranges must be supported without external circuitry. |
| MAX11106ETL+ | 16-bit, 8-channel, 250ksps, SPI-only, ±10.24V fixed range, 12mW typical power, 20-pin TQFN | No bipolar/unipolar software selection; lacks ±25V fault protection; smaller footprint but no REFCOMP buffer | Select for space-constrained, low-power portable instruments where only ±10V inputs are used and external protection is acceptable. |
Compared with AD7606BSTZ and MAX11106ETL+, the LTC1859IG#TRPBF uniquely combines per-channel software-programmable input spans, ±25V fault tolerance, and integrated 4.096V reference buffering - making it optimal for industrial DAQ systems requiring field flexibility and robustness without design compromises.
Availability
LTC1859IG#TRPBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controller I/O modules, and high-speed PC-based data acquisition systems requiring stable component supply across extended temperature operation.
Supply support for LTC1859IG#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1859IG#TRPBF belongs to Linear's SoftSpan™ ADC product line, designed specifically for industrial and instrumentation applications demanding flexible input configuration, high channel count, and ruggedized operation in noisy, high-voltage environments.
FAQ
What input voltage ranges does the LTC1859IG#TRPBF support?
The LTC1859IG#TRPBF supports four software-selectable input ranges per channel: 0V to 5V, 0V to 10V, ±5V, and ±10V. These are implemented via on-chip resistor networks preceding the multiplexer, ensuring accurate scaling without external components. The LTC1859IG#TRPBF achieves this using a single 5V supply and maintains ±3LSB INL across all ranges.
Does the LTC1859IG#TRPBF require an external reference?
No, the LTC1859IG#TRPBF includes a factory-trimmed 2.5V bandgap reference (VREF) and a buffered 4.096V output (REFCOMP) for driving the internal DAC. An external reference can be applied to VREF to improve accuracy, but it is not required. The LTC1859IG#TRPBF delivers full 16-bit performance using its internal reference in standard industrial applications.
How does the ±25V fault protection work on the LTC1859IG#TRPBF?
The LTC1859IG#TRPBF incorporates internal clamping diodes on all analog input pins (CH0–CH7, COM), rated for continuous ±25V operation. During overvoltage events, current is shunted through these diodes without latch-up, and conversion accuracy on the selected channel remains unaffected. This protection is inherent to the silicon design and requires no external components - a key feature of the LTC1859IG#TRPBF.
What is the purpose of the REFCOMP pin on the LTC1859IG#TRPBF?
The REFCOMP pin on the LTC1859IG#TRPBF provides a buffered 4.096V output derived from the internal 2.5V reference via a precision 1.6384× gain stage. It drives the internal capacitive DAC and can supply up to 2mA DC load. The LTC1859IG#TRPBF requires 10µF + 0.1µF decoupling on REFCOMP to maintain 16-bit accuracy and minimize noise coupling into the conversion process.
Can the LTC1859IG#TRPBF operate with a 3V digital interface?
Yes, the LTC1859IG#TRPBF supports 3V-compatible digital signaling: OVDD can be supplied from 3V to 5V, and all digital inputs (SDI, SCK, RD, CONVST) accept 3V logic levels while operating from a 5V AVDD/DVDD supply. This allows direct interfacing with 3V microcontrollers or FPGAs without level shifters - a verified capability of the LTC1859IG#TRPBF per its Absolute Maximum Ratings and Digital Interface specifications.
LTC1859IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- 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:
- -
LTC1859IG#TRPBF FAQ
1.How can I place an order for LTC1859IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1859IG#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 LTC1859IG#TRPBF reliable?
The price and inventory of LTC1859IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1859IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1859IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1859IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1859IG#TRPBF?
LTC1859IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1859IG#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 LTC1859IG#TRPBF?
For technical support, including LTC1859IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1859IG#TRPBF requirements.
6.How does Aetrix verify that LTC1859IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1859IG#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 LTC1859IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1859IG#TRPBF?
All LTC1859IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1859IG#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 LTC1859IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1859IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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