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Analog Devices Inc. LTC1858CG#PBF
- Part No.:
- LTC1858CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1858CG#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
LTC1858CG#PBF from Analog Devices (formerly Linear Technology) is a 14-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 precision 2.5V reference, synchronized clock, and SPI/MICROWIRE™ serial interface - deployed in industrial process control and multiplexed data acquisition systems.
For engineers reviewing the LTC1858CG#PBF datasheet, LTC1858CG#PBF pinout, LTC1858CG#PBF application, or LTC1858CG#PBF equivalent, this page delivers verified specifications, validated pin functions, confirmed fault-protection behavior across all eight channels, and real-world timing constraints for microprocessor/DSP interfacing including BUSY signal handshake and SCK timing compliance up to 20MHz.
Technical Context
The LTC1858CG#PBF implements a successive approximation register (SAR) architecture with integrated sample-and-hold, supporting both single-ended and differential input configurations per channel. Its SoftSpan™ programmability uses on-chip resistor networks and switches to configure input ranges dynamically without external components.
It features three independent ground domains (AGND1/AGND2/AGND3), separate analog (AVDD) and digital (DVDD/OVDD) supplies, and ±25V overvoltage protection on all MUX inputs (CH0–CH7, COM). Fault conditions on unselected channels do not corrupt conversion results on the selected channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes with no missing codes guaranteed over temperature. |
| Sampling Rate | 100ksps maximum - guaranteed throughput with ≤5µs conversion time and ≤4µs acquisition time. |
| INL | ±1.5LSB (max) - ensures high DC accuracy for calibration-sensitive applications like sensor front-ends. |
| Input Ranges | Software-selectable: 0V–5V, 0V–10V, ±5V, ±10V - enables flexible signal conditioning without hardware changes. |
| Power Dissipation | 40mW typical (Nap mode), 27.5mW (Sleep mode) - supports low-power embedded DAQ designs. |
| Signal-to-(Noise+Distortion) | 83dB typical at 1kHz - meets requirements for medium-resolution spectral analysis and control loop feedback. |
| Digital Interface | SPI/MICROWIRE™ compatible - supports 20MHz SCK, active-low RD, and BUSY status signaling for deterministic host synchronization. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 0°C to 70°C operating temperature range, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be low-noise and tied to analog ground plane; defines zero point for CH0–CH7 when used single-ended. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±25V fault-protected; support software-configurable unipolar/bipolar ranges and single-ended/differential pairing. |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer output differential pair | Drives ADC+ and ADC–; rescaled analog signal after SoftSpan attenuation/offset; high-impedance in hold mode. |
| ADC+ / ADC– (12–13) | Differential analog inputs to SAR core | Accept 0V–2.048V / ±1.024V (unipolar/bipolar) when using internal reference; require precise decoupling. |
| VREF (15) | 2.5V internal reference output | Factory-trimmed ±0.1% (2.475V–2.525V); bypass with 1µF tantalum to AGND1 for noise rejection. |
| REFCOMP (16) | 4.096V buffered reference output | Gain-of-1.6384 buffer output; drives internal DAC; rated for ≤2mA DC load; bypass with 10µF + 0.1µF. |
| CONVST (28) | Conversion start trigger | Rising-edge sensitive; initiates acquisition and conversion sequence; minimum high pulse width = 40ns. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output; asserts low during conversion; t2 delay ≤30ns from CONVST rising edge. |
| SDO / SDI / SCK / RD (23,25,26,27) | SPI/MICROWIRE™ serial interface | 3V/5V-tolerant I/O; supports falling-edge data capture up to 20MHz SCK; RD enables SDO output. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input spans | Eliminates external gain/level-shift circuitry; enables per-channel configuration of 0V–5V, 0V–10V, ±5V, or ±10V via SPI command. |
| ±25V fault protection on all MUX inputs | Prevents latch-up or damage during transient overvoltage events; maintains integrity of conversions on selected channels. |
| Three independent analog ground pins (AGND1/2/3) | Reduces ground bounce and crosstalk between reference, MUX, and substrate domains; improves INL and noise performance. |
| Internal 2.5V reference with 10ppm/°C TC | Enables self-contained operation without external references; stable enough for 14-bit accuracy over 0°C–70°C. |
| Dual power-down modes (Nap/Sleep) | Nap mode draws 8mA (40mW); Sleep mode draws only 5.5µA (27.5µW) - extends battery life in portable DAQ systems. |
Applications
| Industrial Process Monitoring | Multiplexed Sensor Data Acquisition |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring of 8 pressure, temperature, and flow sensors in PLC-based factory automation. IC Role / Device Role / Timing Role: 14-bit SAR ADC with per-channel SoftSpan™ range selection handles mixed-signal sensor outputs (0–10V, ±5V) without external scaling. Use Value: Eliminates 8 external op-amp gain stages and reduces BOM count; ±25V fault tolerance prevents system shutdown during field wiring faults. |
Use Scenario: High-speed logging of thermocouple, RTD, and strain gauge signals in test equipment with shared analog front-end. IC Role / Device Role / Timing Role: 8-channel MUX + SAR core samples all sensors at 100ksps aggregate rate; BUSY signal synchronizes FIFO writes to microcontroller. Use Value: Achieves 12.5ksps per channel with deterministic timing; internal reference and clock remove need for external timing components. |
| PC-Based Data Acquisition | DSP-Controlled Motor Drive Feedback |
|
Use Scenario: USB-connected DAQ card acquiring analog signals from lab instruments into PC-hosted MATLAB or LabVIEW. IC Role / Device Role / Timing Role: SPI interface connects directly to FPGA or microcontroller; RD/BUSY handshake ensures lossless data capture at 100ksps. Use Value: 83dB SINAD supports 13.5 effective bits; software-configurable ranges adapt to varying instrument output levels without hardware rework. |
Use Scenario: Real-time current/voltage sensing in servo drive for field-oriented control (FOC) algorithms running on TI C2000 or ST STM32. IC Role / Device Role / Timing Role: Simultaneous sampling of phase currents and DC bus voltage via differential inputs; 4µs conversion enables tight current loop bandwidth. Use Value: Bipolar ±5V mode captures bidirectional motor current; channel-to-channel isolation >120dB prevents cross-talk in multi-phase feedback. |
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 (±10.24V max input), 100ksps, SPI interface, but requires external reference and lacks ±25V fault protection. | Best suited for higher-precision, lower-noise applications where external reference stability is controlled; not suitable for harsh industrial environments with wiring transients. | Select ADS8688IPWR when absolute 16-bit linearity and programmable gain are required, and overvoltage robustness is managed externally. |
| MAX11624EEE+ | 14-bit, 8-channel, SAR ADC with internal reference and 250ksps sampling, but fixed ±5V input range and no software-programmable spans or ±25V protection. | Ideal for cost-sensitive, high-throughput DAQ where input signal ranges are uniform and field overvoltage risk is low. | Choose MAX11624EEE+ for simplified design with faster sampling and lower power, provided input ranges are standardized and fault conditions are mitigated upstream. |
Compared with ADS8688IPWR and MAX11624EEE+, the LTC1858CG#PBF uniquely combines 14-bit resolution, per-channel software-defined input spans, ±25V fault tolerance, and internal reference in a single 28-pin SSOP - making it optimal for ruggedized, mixed-range industrial DAQ where layout space and component count are constrained.
Availability
LTC1858CG#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and PC-based instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1858CG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1858CG#PBF belongs to Linear's legacy SoftSpan™ ADC family, designed specifically for industrial data acquisition systems demanding flexible input scaling, fault resilience, and minimal external component count in space-constrained environments.
FAQ
What is the maximum sampling rate supported by the LTC1858CG#PBF?
The LTC1858CG#PBF guarantees a maximum sampling rate of 100ksps when converting through its CH0–CH7 inputs. This is achieved with a typical conversion time of 4µs and acquisition time of 1µs. The device also supports up to 166ksps when sampling exclusively through the dedicated ADC+ and ADC– pins, though this bypasses the multiplexer and SoftSpan™ programmability. All timing parameters are specified over the full 0°C to 70°C operating range.
Does the LTC1858CG#PBF require an external reference voltage?
No, the LTC1858CG#PBF operates fully autonomously with its internal 2.5V bandgap reference (VREF, Pin 15) and 4.096V buffered reference (REFCOMP, Pin 16). These are factory-trimmed to ±0.1% and ±10ppm/°C, enabling 14-bit accuracy without external components. However, VREF can be overdriven with a higher-accuracy external reference if system-level calibration demands tighter absolute accuracy.
How does the ±25V fault protection work on the LTC1858CG#PBF inputs?
The LTC1858CG#PBF incorporates internal clamping diodes and robust input structures on all CH0–CH7 and COM pins, allowing them to withstand continuous ±25V applied voltage without latch-up or damage. Critically, a fault condition on any unselected channel does not affect the conversion result of the currently selected channel - preserving data integrity in noisy industrial environments where wiring faults or ESD events may occur.
Can the LTC1858CG#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1858CG#PBF supports 3V-compatible digital I/O: its SDI, SCK, RD, and BUSY pins operate with VIH ≥ 2.4V and VIL ≤ 0.8V at VDD = 4.75V–5.25V, ensuring reliable logic-level compatibility with 3.3V microcontrollers. OVDD (Pin 21) may be supplied at 3.3V to match the host's I/O voltage, while AVDD and DVDD remain at 5V for analog/digital core operation.
What are the power consumption modes of the LTC1858CG#PBF and how are they controlled?
The LTC1858CG#PBF offers two user-selectable low-power modes: Nap mode (8mA, 40mW) and Sleep mode (5.5µA, 27.5µW). Both are activated via the 8-bit SPI configuration word written to SDI before CONVST assertion. Nap mode retains reference and clock operation for fast wake-up; Sleep mode shuts down the reference and clock, requiring ~1ms stabilization before first conversion. Power state is retained across conversions until reconfigured.
LTC1858CG#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:
- 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:
- -
LTC1858CG#PBF FAQ
1.How can I place an order for LTC1858CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1858CG#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 LTC1858CG#PBF reliable?
The price and inventory of LTC1858CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1858CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1858CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1858CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1858CG#PBF?
LTC1858CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1858CG#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 LTC1858CG#PBF?
For technical support, including LTC1858CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1858CG#PBF requirements.
6.How does Aetrix verify that LTC1858CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1858CG#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 LTC1858CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1858CG#PBF?
All LTC1858CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1858CG#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 LTC1858CG#PBF part is unused and in its original packaging.
Return procedure for LTC1858CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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