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Analog Devices Inc. LTC1859IG#PBF
- Part No.:
- LTC1859IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1859IG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,001
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Product details
Overview
LTC1859IG#PBF 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, and SoftSpan™ input range selection (0V–5V, 0V–10V, ±5V, or ±10V). It integrates an internal 2.5V reference, 4.096V buffered reference output, sample-and-hold, and SPI/MICROWIRE™ serial interface - deployed in industrial process control data acquisition systems requiring high channel density and robust input protection.
For engineers reviewing the LTC1859IG#PBF datasheet, LTC1859IG#PBF pinout, LTC1859IG#PBF application, or LTC1859IG#PBF equivalent, key selection criteria include its ±3LSB integral nonlinearity over –40°C to +85°C, 87dB typical SNR, 28-pin SSOP package with three analog ground pins (AGND1/AGND2/AGND3), and dual power-down modes (Nap/Sleep) enabling <15µA standby current.
Technical Context
The LTC1859IG#PBF implements a successive approximation register (SAR) architecture with a differential capacitive DAC and high-speed comparator, using an internal trimmed clock for guaranteed ≤5µs conversion time. Its programmable resistor-divider network precedes the 8-channel multiplexer, eliminating multiplexer on-resistance errors and enabling per-channel span and polarity configuration.
Input signal conditioning occurs before channel selection: each channel's attenuation and offset are set via 8-bit command words clocked into SDI, supporting simultaneous unipolar/bipolar and single-ended/differential configurations across the eight inputs. Fault protection to ±25V on all MUX inputs ensures channel isolation during overvoltage events without affecting conversion integrity on the selected channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision measurement of small signal variations. |
| Sampling Rate | 100ksps - supports real-time capture of signals up to 50kHz Nyquist bandwidth in multiplexed systems. |
| INL (Integral Nonlinearity) | ±3LSB - ensures monotonicity and end-point accuracy critical for closed-loop control calibration. |
| SNR | 87dB typical - enables >14-bit effective resolution in noise-sensitive instrumentation applications. |
| Input Voltage Ranges | Software-selectable 0V–5V, 0V–10V, ±5V, ±10V - eliminates external gain-switching circuitry and simplifies multi-sensor interfacing. |
| Power Dissipation | 40mW typical - balances performance and thermal management in space-constrained industrial modules. |
| Fault Protection | ±25V on CH0–CH7 and COM - allows direct connection to field wiring without external clamping diodes or series resistors. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, lead-free finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be low-noise analog ground reference; connects to AGND1/AGND2/AGND3 plane for optimal INL performance. |
| MUXOUT+ (10), MUXOUT– (11) | Differential output of programmable input multiplexer | Carries rescaled analog signal to ADC core; requires direct connection to ADC+/ADC– for normal operation. |
| ADC+ (12), ADC– (13) | Differential analog input to SAR core | Accepts ±2.048V or ±4.096V full-scale differential signals; high-impedance node requiring local decoupling. |
| VREF (15) | 2.5V internal bandgap reference output | Factory-trimmed ±0.1% initial accuracy; bypass with 1µF tantalum to AGND1 for stable reference voltage. |
| REFCOMP (16) | 4.096V buffered reference output | Gain-of-1.6384 buffer output driving internal DAC; supports ≤2mA DC load but not AC loads. |
| CONVST (28) | Active-high conversion start trigger | Rising edge initiates acquisition and conversion; minimum 40ns pulse width required for reliable timing. |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ software-programmable input ranges | Per-channel selection of 0V–5V, 0V–10V, ±5V, or ±10V eliminates external gain/level-shifting components and enables mixed-signal sensor arrays on one IC. |
| ±25V fault-protected analog inputs | Robust input clamping prevents latch-up and maintains conversion integrity on selected channels during field-wiring faults or ESD transients. |
| Three independent analog ground pins (AGND1/AGND2/AGND3) | Enables separate grounding of reference, MUX, and substrate sections to minimize ground bounce and improve PSRR above 100kHz. |
| SPI/MICROWIRE™ serial interface with BUSY and RD handshake | Allows direct connection to microcontrollers and DSPs without glue logic; BUSY flag enables interrupt-driven data reads and avoids polling overhead. |
| Dual power-down modes (Nap and Sleep) | Nap mode reduces current to 8mA (40mW), Sleep mode to 5.5µA - extends battery life in portable DAQ and enables rapid wake-up (<1µs) for event-triggered sampling. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors across 8 PLC I/O channels in hazardous-area refineries. IC Role / Device Role / Timing Role: 16-bit precision ADC with ±25V input tolerance acquires sensor outputs while rejecting common-mode noise from 4–20mA loops and motor drives. Use Value: Eliminates external protection and signal-conditioning circuitry per channel, reducing BOM cost by ~35% versus discrete op-amp + mux + ADC solutions. | Use Scenario: High-throughput parametric testing of semiconductor devices using multiplexed voltage/current stimulus and response capture. IC Role / Device Role / Timing Role: 100ksps sampling rate synchronizes with test pattern generators; software-selectable spans accommodate DUT-specific voltage compliance levels (±5V for logic, 0–10V for power devices). Use Value: Reduces test head complexity by integrating 8-channel acquisition, reference, and digital interface - cutting test cycle time by 22% through parallel channel setup. |
| Programmable Logic Controller (PLC) Analog Input Module | High-Speed Data Acquisition for PCs |
Use Scenario: DIN-rail mounted PLC module acquiring analog signals from factory-floor transducers under wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade LTC1859IG#PBF variant provides guaranteed ±3LSB INL and 87dB SNR across full temperature range without recalibration. Use Value: Enables Class A accuracy certification for ISA-88 compliant control systems while maintaining single-supply 5V operation and compact 28-SSOP footprint. | Use Scenario: USB-connected DAQ device capturing vibration spectra from accelerometers at 100ksps for predictive maintenance analytics. IC Role / Device Role / Timing Role: Internal 2.5V reference and 4.096V REFCOMP buffer deliver stable full-scale scaling; SPI interface streams data directly to FPGA-based USB controller. Use Value: Achieves 14.5 ENOB at 1kHz without external reference or clock sources, reducing PCB area by 40% versus dual-chip reference + ADC designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, software-programmable ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606BSTZ | 8-channel, 16-bit, 200ksps, ±10V input, uses external reference; no per-channel span programming; requires ±5V dual supply or charge pump. | Higher throughput but fixed input range; better suited for high-speed synchronized sampling than flexible sensor interfacing. | Select AD7606BSTZ when absolute speed >100ksps and channel-to-channel simultaneity are required over per-channel range flexibility. |
| ADS8688IPWR | 8-channel, 16-bit, 100ksps, integrated reference, SPI interface; supports only 0–5V and ±5V ranges (no ±10V); lower INL (±1.5LSB) but no ±25V fault protection. | Lower input voltage tolerance and fewer span options limit use in legacy industrial fieldbus environments with ±10V standards. | Select ADS8688IPWR for cost-sensitive, non-hazardous applications where ±10V support and ±25V protection are unnecessary. |
Compared with AD7606BSTZ and ADS8688IPWR, the LTC1859IG#PBF uniquely combines per-channel software-programmable spans (including ±10V), ±25V fault tolerance, and single 5V supply operation - making it the only option for retrofitting legacy ±10V sensor networks into modern low-voltage embedded DAQ systems without redesigning front-end protection.
Availability
LTC1859IG#PBF is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, programmable logic controller analog input modules, and high-speed PC-based data acquisition requiring stable component supply across extended temperature ranges.
Supply support for LTC1859IG#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 LTC1859IG#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for industrial-grade multichannel ADC applications demanding software-configurable input ranges, robust fault protection, and seamless microcontroller integration.
FAQ
What is the operating temperature range for the LTC1859IG#PBF?
The LTC1859IG#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number. This range is fully specified for all key parameters including ±3LSB integral nonlinearity, 87dB SNR, and 100ksps sampling rate - ensuring reliable performance in harsh environments such as factory floors and outdoor control cabinets without derating.
Does the LTC1859IG#PBF require an external reference voltage?
No, the LTC1859IG#PBF includes a factory-trimmed 2.5V internal bandgap reference (VREF) and a 4.096V buffered reference output (REFCOMP) that drive the internal DAC. An external reference may be applied to VREF only if higher accuracy is needed; the internal reference supports full 16-bit performance with proper 1µF/10µF decoupling as specified in the datasheet for LTC1859IG#PBF.
How does the SoftSpan™ feature work on the LTC1859IG#PBF?
SoftSpan™ enables per-channel software-programmable input ranges via an 8-bit command word clocked into the SDI pin. Each channel can be independently configured for 0V–5V, 0V–10V, ±5V, or ±10V using on-chip resistor dividers that precede the multiplexer - eliminating multiplexer on-resistance errors and allowing mixed-range sensor inputs (e.g., thermocouples and strain gauges) on the same LTC1859IG#PBF device.
What are the power-down modes available on the LTC1859IG#PBF?
The LTC1859IG#PBF offers two user-selectable power-down modes: Nap mode (8mA supply current, 40mW dissipation) and Sleep mode (5.5µA supply current, <1µW dissipation). Both modes retain register settings and allow fast wake-up (<1µs) upon CONVST assertion, making LTC1859IG#PBF ideal for battery-powered or energy-conscious industrial monitoring nodes.
Can the LTC1859IG#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1859IG#PBF supports 3V-compatible digital I/O: its RD, SCK, SDI, and SDO pins operate with VIH = 2.4V min and VIL = 0.8V max at VDD = 4.75V–5.25V, allowing direct connection to 3.3V logic without level shifters. The OVDD pin can be supplied at 3.3V to match the microcontroller's I/O voltage, while AVDD/DVDD remain at 5V for analog performance - a key design flexibility of the LTC1859IG#PBF.
LTC1859IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1859IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1859IG#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 LTC1859IG#PBF reliable?
The price and inventory of LTC1859IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1859IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1859IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1859IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1859IG#PBF?
LTC1859IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1859IG#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 LTC1859IG#PBF?
For technical support, including LTC1859IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1859IG#PBF requirements.
6.How does Aetrix verify that LTC1859IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1859IG#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 LTC1859IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1859IG#PBF?
All LTC1859IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1859IG#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 LTC1859IG#PBF part is unused and in its original packaging.
Return procedure for LTC1859IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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