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Analog Devices Inc. LTC1858IG#PBF
- Part No.:
- LTC1858IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1858IG#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
LTC1858IG#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, sample-and-hold, and SPI/MICROWIRE™ serial interface - deployed in industrial process control, multiplexed data acquisition, and DSP interfacing.
For engineers reviewing the LTC1858IG#PBF datasheet, LTC1858IG#PBF pinout, LTC1858IG#PBF application, or LTC1858IG#PBF equivalent, key selection criteria include its 14-bit resolution with ±1.5LSB INL, 87dB SNR (typ), ±25V input fault protection, 28-pin SSOP package, and support for both single-ended and differential channel configurations across all eight inputs.
Technical Context
The LTC1858IG#PBF implements a successive approximation register (SAR) architecture with an integrated sample-and-hold and factory-trimmed internal clock enabling guaranteed 100ksps throughput and 5µs max conversion time. Its SoftSpan™ programmable attenuator network precedes the 8-channel analog multiplexer, eliminating multiplexer on-resistance errors and enabling per-channel input range and polarity configuration.
It supports dual ground domains (AGND1/2/3, DGND), separate analog (AVDD), digital (DVDD), and output buffer (OVDD) supplies, and features dedicated REFCOMP (4.096V) and VREF (2.5V) pins for precision reference routing. All analog inputs are fault-protected to ±25V, and a fault on any unselected channel does not corrupt the conversion result of the selected channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes with monotonic transfer and no missing codes over full temperature range. |
| Sampling Rate | 100ksps - guaranteed minimum throughput for all 8 channels, enabling real-time monitoring of fast industrial transients. |
| INL Error | ±1.5LSB (max, –40°C to +85°C) - ensures high absolute accuracy for calibrated sensor interfaces without external trimming. |
| Signal-to-Noise Ratio | 87dB (typ, 1kHz input) - supports high-fidelity digitization of low-level analog signals in noisy environments. |
| Input Voltage Range | Software-selectable: 0V–5V, 0V–10V, ±5V, or ±10V - eliminates external gain/level-shifting circuitry across diverse sensor types. |
| Power Dissipation | 40mW (typ, active mode) - enables thermally constrained designs; reduces to 27.5mW in Nap mode and 8µW in Sleep mode. |
| Fault Protection | ±25V on CH0–CH7 and COM - allows direct connection to industrial field wiring without external clamping diodes. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, RoHS-compliant lead-free finish (PBF).
| 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 all CH0–CH7 single-ended measurements. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | Each accepts ±25V fault-protected inputs; software-configurable as single-ended or differential pairs (e.g., CH0/CH1). |
| MUXOUT+ / MUXOUT– (10/11) | Multiplexer output differential pair | Drives ADC+ and ADC–; accessible for external signal conditioning or diagnostic probing before conversion stage. |
| ADC+ / ADC– (12/13) | Differential analog inputs to SAR core | Accept rescaled signals from MUXOUT; high-impedance (Hi-Z) node requiring low-source-impedance driving. |
| VREF (15) | 2.5V internal reference output | Factory-trimmed ±10ppm/°C; bypassed with 1µF tantalum to AGND1; usable as external reference source. |
| REFCOMP (16) | 4.096V buffered reference output | Gain-of-1.6384 buffer output of VREF; drives internal DAC; rated for ≤2mA DC load only. |
| CONVST (28) | Active-high conversion start trigger | Rising edge initiates acquisition and conversion; minimum 40ns pulse width required for reliable timing. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output; asserts during conversion; used for handshaking with microcontrollers or FIFOs. |
| SDO / SDI / SCK / RD (23,25,26,27) | SPI/MICROWIRE™ serial interface | 3-wire synchronous interface (SDO out, SDI in, SCK clock); RD enables SDO output; supports up to 20MHz SCK. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable input spans | Per-channel selection of 0V–5V, 0V–10V, ±5V, or ±10V via 8-bit command word - eliminates hardware reconfiguration for multi-sensor systems. |
| ±25V fault-protected analog inputs | Robust input structure withstands transient overvoltages without latch-up or performance degradation - critical for industrial I/O modules. |
| Integrated precision reference system | VREF (2.5V) + REFCOMP (4.096V) with <±10ppm/°C drift - removes need for external voltage references and associated layout complexity. |
| Dual power-down modes (Nap/Sleep) | Nap mode reduces current to 8mA (27.5mW); Sleep mode draws only 5.5µA - extends battery life in portable DAQ systems. |
| Channel-to-channel isolation | –120dB (1kHz) - prevents crosstalk between simultaneously sampled channels, preserving integrity in high-density sensor arrays. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O slots with varying output ranges (4–20mA, ±10V, 0–5V). IC Role / Device Role / Timing Role: 8-channel ADC performs synchronized sampling with per-channel SoftSpan™ range selection and ±25V fault tolerance. Use Value: Eliminates external level-shifting and protection circuitry per channel, reducing BOM count and PCB area by >30%. |
Use Scenario: High-channel-count environmental monitoring system logging vibration, humidity, and voltage across distributed sensors. IC Role / Device Role / Timing Role: Centralized 14-bit digitizer with 100ksps aggregate rate, SPI interface to ARM Cortex-M7 host, and low 40mW power draw. Use Value: Enables 16-bit-equivalent effective resolution via oversampling and noise shaping while maintaining deterministic timing. |
| High-Speed PC-Based DAQ | DSP Interface for Real-Time Signal Processing |
Use Scenario: USB-connected data logger capturing motor current waveforms at 100ksps for FFT-based fault detection. IC Role / Device Role / Timing Role: ADC feeds raw samples directly to FPGA or microcontroller via BUSY/SDO handshake; supports burst-mode transfers. Use Value: 5µs conversion time and dedicated BUSY signal ensure zero-latency synchronization with host DMA engines. |
Use Scenario: Real-time audio or vibration analysis where ADC output streams into TI C6000 DSP for adaptive filtering. IC Role / Device Role / Timing Role: SPI-compatible serial output aligns with DSP's McBSP interface; RD/SDO timing meets 20MHz SCK requirement. Use Value: Eliminates glue logic and level translators - direct connection reduces signal path delay and jitter-induced SNR loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, programmable ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 8-channel, SAR ADC; 100ksps; internal 4.096V ref; ±12V input range (no ±25V fault protection); SPI interface. | Requires external overvoltage protection for industrial field inputs; higher resolution but lower fault robustness. | Select when absolute 16-bit accuracy is prioritized over ruggedness; verify external protection design for ±25V transients. |
| AD7606BSTZ | 16-bit, 8-channel, simultaneous-sampling SAR ADC; ±10V input; on-chip 2.5V ref; parallel + SPI interface; no per-channel range programming. | Lacks SoftSpan™ flexibility - all channels fixed to same bipolar/unipolar mode; requires external multiplexer for mixed-range inputs. | Choose for applications needing true simultaneous sampling across all 8 channels, accepting fixed input range and larger footprint. |
Compared with ADS8688IPWR and AD7606BSTZ, the LTC1858IG#PBF uniquely combines per-channel software-programmable input ranges, ±25V fault tolerance, and 14-bit/100ksps performance in a compact 28-pin SSOP - making it optimal for space-constrained, mixed-signal industrial nodes where flexibility and ruggedness are co-prioritized.
Availability
LTC1858IG#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 assurance, and RoHS-compliant packaging.
Supply support for LTC1858IG#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.
The LTC1858IG#PBF belongs to Linear's legacy SoftSpan™ ADC family, designed specifically for industrial and instrumentation applications demanding flexible input scaling, high channel density, and field-rugged reliability without external support components.
FAQ
What is the operating temperature range of the LTC1858IG#PBF?
The LTC1858IG#PBF is specified for operation from –40°C to +85°C (Industrial grade), as indicated by the "I" suffix in the part number. All DC and dynamic specifications - including ±1.5LSB INL, 87dB SNR, and ±25V fault protection - are guaranteed across this full range.
Does the LTC1858IG#PBF require an external reference, or can it operate with its internal reference?
The LTC1858IG#PBF operates fully with its internal 2.5V reference (VREF) and 4.096V buffered reference (REFCOMP). External references may be applied to VREF for improved accuracy, but are not required - the internal reference is factory-trimmed to ±10ppm/°C and supports all specified performance.
How does the SoftSpan™ feature work on the LTC1858IG#PBF?
The SoftSpan™ feature on the LTC1858IG#PBF uses on-chip resistor networks and switches to program each channel's input range (0V–5V, 0V–10V, ±5V, or ±10V) via an 8-bit command word sent on SDI. This occurs before the signal reaches the multiplexer, eliminating on-resistance errors and enabling per-channel flexibility without external components.
Can the LTC1858IG#PBF accept differential inputs, and how are they configured?
Yes, the LTC1858IG#PBF supports differential inputs: adjacent channel pairs (e.g., CH0/CH1, CH2/CH3) can be configured as differential inputs via the same 8-bit command word that selects range and channel. The differential signal appears across MUXOUT+/MUXOUT– and is converted by the internal SAR core referenced to ADC+/ADC–.
What are the power-down modes available on the LTC1858IG#PBF, and how much power do they save?
The LTC1858IG#PBF offers two user-selectable power-down modes: Nap mode (8mA supply current, ~27.5mW) and Sleep mode (5.5µA, ~8µW). Both retain register settings and allow fast wake-up (<1µs), enabling dynamic power management in battery-powered or thermally sensitive applications without losing configuration state.
LTC1858IG#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1858IG#PBF FAQ
1.How can I place an order for LTC1858IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1858IG#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 LTC1858IG#PBF reliable?
The price and inventory of LTC1858IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1858IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1858IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1858IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1858IG#PBF?
LTC1858IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1858IG#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 LTC1858IG#PBF?
For technical support, including LTC1858IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1858IG#PBF requirements.
6.How does Aetrix verify that LTC1858IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1858IG#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 LTC1858IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1858IG#PBF?
All LTC1858IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1858IG#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 LTC1858IG#PBF part is unused and in its original packaging.
Return procedure for LTC1858IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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