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Analog Devices Inc. LTC1859CG#PBF
- Part No.:
- LTC1859CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1859CG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
LTC1859CG#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 (REFCOMP), and SPI/MICROWIRE™ serial interface - used in industrial process control and multiplexed data acquisition systems requiring high DC accuracy and channel-level range flexibility.
For engineers reviewing the LTC1859CG#PBF datasheet, LTC1859CG#PBF pinout, LTC1859CG#PBF application, or LTC1859CG#PBF equivalent, key selection criteria include its ±3LSB integral nonlinearity over temperature, 87dB typical SNR, 28-pin SSOP package with three AGND pins for noise isolation, and support for both single-ended and differential input configurations per channel.
Technical Context
The LTC1859CG#PBF implements a successive approximation register (SAR) architecture with integrated sample-and-hold, internal synchronized clock trimmed to 5µs max conversion time, and programmable input scaling via on-chip resistor networks preceding the 8-channel analog multiplexer. Its SoftSpan™ feature enables per-channel software-selectable unipolar or bipolar input ranges without external components.
It supports dual-reference operation: internal 2.5V bandgap reference (VREF) with ±10ppm/°C drift, and a factory-trimmed 4.096V buffered output (REFCOMP) driving the DAC core. Fault protection isolates ±25V overvoltage on any unselected channel, preventing corruption of the active channel's conversion result.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision measurement applications |
| Sampling Rate | 100ksps - guarantees real-time acquisition across all 8 channels with no throughput penalty |
| INL (Integral Nonlinearity) | ±3LSB (over full temperature range) - ensures end-point accuracy within ±0.0046% of full-scale for calibration-sensitive systems |
| Signal-to-Noise Ratio | 87dB (typical at 1kHz) - supports >14-bit effective resolution in low-noise signal chains |
| Input Voltage Ranges | Software-selectable 0V–5V, 0V–10V, ±5V, ±10V - eliminates external gain/attenuation circuitry per channel |
| Power Dissipation | 40mW (typical active), 27.5mW (Nap mode), 8µW (Sleep mode) - enables low-power embedded DAQ designs |
| Analog Input Protection | ±25V fault tolerance on CH0–CH7 and COM - prevents latch-up or damage during sensor overvoltage events |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0°C to 70°C operating temperature range, lead-free finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be connected to clean analog ground plane; serves as baseline for all CH0–CH7 unipolar measurements |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±25V fault-protected; configurable per channel for single-ended or differential pairs via software address |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer output differential pair | Drives ADC+ and ADC– directly; allows external signal conditioning between MUX and ADC stages |
| ADC+ / ADC– (12–13) | Differential analog inputs to SAR core | Accept rescaled signals from MUXOUT; high-impedance (Hi-Z) sample mode, 4pF hold capacitance |
| AGND1/AGND2/AGND3 (14,17,18) | Analog ground connections | Separate pins minimize digital coupling; AGND3 is substrate connection for noise isolation |
| VREF (15) | 2.5V internal reference output | Bypass with 1µF tantalum; can be overdriven by external reference for improved accuracy |
| REFCOMP (16) | 4.096V buffered reference output | Bypass with 10µF + 0.1µF; drives internal DAC; supports ≤2mA DC load only |
| AVDD / DVDD / OVDD (19–21) | Analog, digital, and output buffer supplies | AVDD/DVDD = 4.75–5.25V; OVDD = 3–5V for 3V/5V logic compatibility; each requires local decoupling |
| BUSY (22) | Conversion status indicator | Active-low open-drain output; asserts during conversion; synchronizes with microprocessor read cycles |
| SDO / SDI / SCK / RD / CONVST (23–28) | SPI/MICROWIRE™ serial interface | 20MHz SCK max; RD enables SDO; CONVST rising edge initiates conversion; supports daisy-chain configuration |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ software-programmable input ranges | Enables per-channel selection of 0V–5V, 0V–10V, ±5V, or ±10V without hardware changes - reduces BOM count and layout variants |
| ±25V input fault protection | Prevents conversion corruption or device damage when unused channels experience overvoltage - critical for field-connected sensors |
| Three independent analog ground pins (AGND1/2/3) | Minimizes ground bounce and digital noise coupling into sensitive analog paths - improves INL and SNR stability |
| Internal 2.5V reference + 4.096V REFCOMP buffer | Eliminates need for external precision references; REFCOMP provides stable DAC reference with <±10ppm/°C drift |
| Nap and Sleep power shutdown modes | Reduces active current to 8mA (Nap) or 5.5µA (Sleep) - extends battery life in portable DAQ instruments |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O modules with varying output spans (4–20mA, ±10V, 0–5V). IC Role / Device Role / Timing Role: 16-bit ADC digitizing conditioned sensor outputs; SoftSpan™ configures each channel to match sensor full-scale without external op-amp gain stages. Use Value: Eliminates per-channel external scaling circuitry, reducing PCB area by >30% and calibration complexity while maintaining ±3LSB INL across 0°C–70°C. | Use Scenario: High-channel-count environmental monitoring system logging voltage outputs from thermocouples, strain gauges, and RTDs in a single rack unit. IC Role / Device Role / Timing Role: Centralized 8-channel sampling front-end with simultaneous fault protection; BUSY and RD signals interface directly to FPGA-based data buffering logic. Use Value: ±25V channel isolation prevents cross-talk during lightning-induced transients on outdoor sensor lines, ensuring data integrity without external TVS arrays. |
| High-Speed PC-Based DAQ | Digital Signal Processing Front-End |
Use Scenario: USB-connected oscilloscope accessory acquiring mixed-signal waveforms from lab equipment with variable output levels. IC Role / Device Role / Timing Role: 100ksps sampling engine feeding FPGA preprocessing; SPI interface enables compact host-controller communication with minimal GPIO usage. Use Value: 87dB SNR and 100ksps sustained rate support 14.5 ENOB at 1kHz - sufficient for audio-band spectral analysis and transient capture. | Use Scenario: Real-time vibration analysis node in predictive maintenance edge device, digitizing accelerometer outputs before FFT computation. IC Role / Device Role / Timing Role: Precision analog front-end providing calibrated 16-bit samples to DSP; REFCOMP pin supplies stable 4.096V reference to external anti-aliasing filter op-amps. Use Value: Internal 4.096V buffer eliminates reference drift mismatch between ADC and signal-conditioning stage - maintains amplitude accuracy across temperature. |
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 |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 8-channel, SAR ADC with integrated PGA; 100ksps; SPI interface; requires external reference; no ±25V fault protection | Designed for lower-cost industrial DAQ where PGA gain flexibility outweighs fault tolerance needs | Select when programmable gain per channel is required and ±25V protection is handled externally |
| AD7606BSTZ | 16-bit, 8-channel, simultaneous-sampling SAR ADC; 200ksps; parallel/SPI interface; ±16.5V input; requires external reference and power supply sequencing | Targeted at high-coherence applications (e.g., motor phase current sensing) requiring true simultaneous sampling | Select when channel-to-channel sampling skew must be <10ns and absolute timing alignment is critical |
Compared with ADS8688IPWR and AD7606BSTZ, the LTC1859CG#PBF uniquely combines per-channel software-selectable input ranges, ±25V fault protection, and internal reference in a single 28-pin SSOP package - simplifying design for mixed-span sensor systems where robustness and layout efficiency are prioritized over simultaneous sampling or integrated PGA.
Availability
LTC1859CG#PBF 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 0°C to 70°C performance compliance.
Supply support for LTC1859CG#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1859CG#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for multichannel, high-accuracy industrial measurement systems demanding software-configurable flexibility, fault resilience, and minimal external component count.
FAQ
What is the maximum sampling rate supported by the LTC1859CG#PBF?
The LTC1859CG#PBF guarantees a maximum sampling rate of 100ksps across all 8 input channels. This is achieved using its internal trimmed clock and 5µs maximum conversion time. When sampling only the dedicated ADC+ and ADC– pins (bypassing the multiplexer), the device supports up to 166ksps - but this mode sacrifices multichannel capability. The 100ksps rating applies under full 8-channel sequential operation with software range selection enabled.
Does the LTC1859CG#PBF require an external reference voltage?
No, the LTC1859CG#PBF operates fully with its internal 2.5V reference (VREF) and 4.096V buffered reference (REFCOMP), eliminating the need for external references in most applications. However, VREF can be overdriven with a precision external reference if higher absolute accuracy is required. The internal reference is factory-trimmed to ±2.5mV (±0.1%) and exhibits ±10ppm/°C temperature drift - sufficient for many industrial measurement tasks without calibration.
How does the SoftSpan™ feature work on the LTC1859CG#PBF?
The SoftSpan™ feature on the LTC1859CG#PBF uses on-chip resistor networks and switches to provide software-selectable input ranges per channel: 0V–5V, 0V–10V, ±5V, or ±10V. An 8-bit command word sent via SPI configures both the multiplexer channel and its associated attenuation/offset network simultaneously. Because scaling occurs before the multiplexer, errors from switch resistance do not affect accuracy - enabling true per-channel range independence without external components.
What are the power supply requirements for the LTC1859CG#PBF?
The LTC1859CG#PBF requires three separate 5V supplies: AVDD (analog), DVDD (digital core), and OVDD (output buffer), each specified from 4.75V to 5.25V. OVDD may operate down to 3V for 3V logic compatibility. Each supply must be independently decoupled: AVDD with 0.1µF ceramic + 10µF tantalum, DVDD with same, and OVDD with same. Total active power dissipation is 40mW typical; Nap mode draws 8mA, Sleep mode draws 5.5µA - all specified at TA = 25°C and fSAMPLE = 100kHz.
Can the LTC1859CG#PBF handle overvoltage conditions on unused channels?
Yes, the LTC1859CG#PBF provides ±25V fault protection on all analog input pins (CH0–CH7 and COM). A fault condition on any unselected channel will not affect the conversion result of the selected channel due to internal isolation circuitry. This protection is inherent to the input structure and requires no external components. The device tolerates currents exceeding 100mA during overvoltage events without latch-up, making it suitable for harsh industrial environments with unpredictable sensor wiring faults.
LTC1859CG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1859CG#PBF FAQ
1.How can I place an order for LTC1859CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1859CG#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 LTC1859CG#PBF reliable?
The price and inventory of LTC1859CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1859CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1859CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1859CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1859CG#PBF?
LTC1859CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1859CG#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 LTC1859CG#PBF?
For technical support, including LTC1859CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1859CG#PBF requirements.
6.How does Aetrix verify that LTC1859CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1859CG#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 LTC1859CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1859CG#PBF?
All LTC1859CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1859CG#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 LTC1859CG#PBF part is unused and in its original packaging.
Return procedure for LTC1859CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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