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Analog Devices Inc. LTC2358HLX-18#PBF
- Part No.:
- LTC2358HLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2358HLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
LTC2358HLX-18#PBF from Analog Devices is an 18-bit, 8-channel simultaneous-sampling SAR ADC with buffered differential inputs, ±10.24V input range, 200ksps/ch throughput, and 96.4dB SNR. It features per-channel SoftSpan™ programmable input ranges (±10.24V/0–10.24V/±5.12V/0–5.12V), integrated 4.096V reference buffer, and rail-to-rail input overdrive tolerance - enabling direct digitization of high-voltage industrial sensor signals without external signal conditioning.
For engineers reviewing the LTC2358HLX-18#PBF datasheet, LTC2358HLX-18#PBF pinout, LTC2358HLX-18#PBF application, or LTC2358HLX-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, ±3.5LSB INL over ±10.24V range, 128dB CMRR at 200Hz, 500pA max input leakage at 125°C, and support for both SPI CMOS (1.8–5V) and LVDS serial interfaces in a 48-lead LQFP package.
Technical Context
The LTC2358HLX-18#PBF implements a true simultaneous sampling architecture using eight independent analog input buffers and a shared 18-bit SAR core, enabling synchronized acquisition across all channels without inter-channel skew. Its picoamp-input buffers maintain high impedance (>1000GΩ) and low leakage (≤500pA at 85°C, ≤12nA at 125°C) while supporting ±30VP-P common-mode range (VEE + 4V to VCC – 4V).
It employs internal conversion clocking with zero cycle latency and supports dual digital interfaces: pin-selectable CMOS (1.8–5V OVDD) with configurable 1–8 data lanes, or LVDS with differential SCKI/SDO pairs. The SoftSpan™ configuration is set per-conversion via SPI command, allowing dynamic range reconfiguration without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full temperature range (–40°C to +125°C). |
| Sampling Rate | 200ksps per channel (8-channel simultaneous) - enables real-time monitoring of fast transients in power line or motor control systems. |
| INL (Max) | ±3.5LSB at ±10.24V range - ensures <±0.0027% full-scale accuracy for precision measurement applications. |
| SNR (Typ) | 96.4dB at fIN = 2kHz - delivers >15.9 effective number of bits (ENOB) for high-fidelity signal capture. |
| CMRR (Typ) | 128dB at 200Hz - rejects common-mode noise from noisy industrial environments without external instrumentation amplifiers. |
| Input Leakage | ≤12nA at +125°C - preserves signal integrity in high-impedance sensor interfaces (e.g., piezoelectric, thermocouple) at extended temperature. |
| Power Dissipation | 219mW at 200ksps (8 channels) - enables compact thermal design in space-constrained PLC or DAQ modules. |
Pinout & Package
48-lead (7mm × 7mm) plastic LQFP package (LX) with exposed pad for thermal management; operating junction temperature up to +150°C (θJA = 53°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+ | Differential analog input positive | Accepts buffered differential signals with ±30VP-P common-mode range; each pair supports independent SoftSpan™ configuration. |
| IN0– to IN7– | Differential analog input negative | Paired with corresponding INx+; enables true bipolar, unipolar, or arbitrary common-mode drive configurations. |
| VCC / VEE | Analog supply rails | Support wide voltage operation: VCC = +7.5V to +38V, VEE = –16.5V to 0V - accommodates ±15V, ±12V, or asymmetric supplies. |
| VDD / OVDD | Digital core and I/O supply | VDD = 4.75–5.25V (core logic); OVDD = 1.71–5.25V (CMOS) or 2.375–5.25V (LVDS) - enables mixed-voltage system interfacing. |
| REFBUF / REFIN | Reference buffer output and input | REFBUF provides 4.096V buffered reference; REFIN accepts 1.25–2.2V external reference or disables internal buffer when grounded. |
| CS / CNV / BUSY / SDO0–SDO7 / SCKI / SCKO | Digital interface control and data | Supports SPI-compatible CMOS or LVDS serial protocol; BUSY indicates conversion completion; CNV initiates sample-and-hold. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan™ input range selection | Enables runtime configuration of ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V per channel - eliminates need for external gain-switching circuitry. |
| Simultaneous sampling with aperture matching | 150ps max aperture delay mismatch between channels - ensures phase-coherent multi-channel acquisition for power quality analysis. |
| Rail-to-rail input overdrive tolerance | Withstands analog inputs up to ±(VCC–VEE) without damage or conversion corruption - simplifies front-end protection design. |
| Integrated reference buffer (4.096V) | Delivers 1.9mA load current with ±0.025% full-scale error drift - removes need for external reference IC and buffer op-amp. |
| Low input leakage (≤12nA @ 125°C) | Maintains accuracy with high-Z sensors (e.g., strain gauges, pH electrodes) without active guarding or guard traces. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules in modular PLC chassis acquiring voltage/current signals from field transmitters and actuators. IC Role / Device Role / Timing Role: Simultaneous 8-channel digitization of ±10V/4–20mA loop signals with synchronized sampling for closed-loop control timing. Use Value: Eliminates external multiplexing and sample-hold circuits, reducing BOM count and PCB area while maintaining channel-to-channel coherence. | Use Scenario: Distributed I/O nodes in chemical plant DCS systems monitoring pressure, temperature, and flow sensors across hazardous zones. IC Role / Device Role / Timing Role: Buffered ADC front-end handling 0–10V and ±5V sensor outputs with 128dB CMRR to reject EMI from nearby VFDs and solenoids. Use Value: Achieves <±0.003% measurement accuracy over –40°C to +125°C ambient without calibration drift compensation firmware. |
| Power Line Monitoring | Test and Measurement |
Use Scenario: Three-phase power quality analyzers capturing voltage and current waveforms for harmonic distortion (THD), flicker, and sag/swell detection. IC Role / Device Role / Timing Role: Simultaneous sampling of 6 differential inputs (3V + 3I) at 200ksps with 96.4dB SNR and –111dB THD for IEEE 1459-compliant measurements. Use Value: Enables Class A PQ analyzer compliance with single-chip solution, avoiding interleaved ADC synchronization complexity. | Use Scenario: Modular automated test equipment (ATE) platforms requiring flexible, high-accuracy analog stimulus/response measurement. IC Role / Device Role / Timing Role: Reconfigurable input stage supporting multiple voltage ranges and signal types (bipolar/unipolar/arbitrary) via SPI command per acquisition. Use Value: Reduces per-test fixture hardware variants; one board supports sensor characterization, power supply validation, and RF front-end testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 8-channel, ±10V range, but uses external reference; 225ksps max; 100dB SNR; requires external op-amps for high-Z buffering. | Lower SNR and no integrated reference buffer limit dynamic range in noise-sensitive applications like audio test. | Select when cost sensitivity outweighs need for integrated reference and higher SNR; verify external buffer stability with high-CM input sources. |
| ADS8688 | 16-bit, 8-channel, ±10.24V range, integrated reference, but only 100ksps/ch; 92dB SNR; single-supply (5V) analog operation. | Lower resolution and sampling rate restrict use in high-fidelity power quality or transient capture where 18-bit ENOB is required. | Select for lower-power, cost-optimized industrial I/O where 16-bit resolution suffices and thermal budget is constrained. |
Compared with AD7606C-18 and ADS8688, the LTC2358HLX-18#PBF delivers superior 96.4dB SNR and integrated 4.096V reference buffer - enabling higher measurement fidelity and reduced external component count in high-temperature industrial environments up to +125°C.
Availability
LTC2358HLX-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and power line monitoring equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC2358HLX-18#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2358 product line was designed for high-accuracy, multi-channel data acquisition in harsh industrial environments - emphasizing simultaneous sampling, wide input voltage range, and extended temperature operation without performance degradation.
FAQ
What is the maximum operating temperature range for the LTC2358HLX-18#PBF?
The LTC2358HLX-18#PBF is rated for operation from –40°C to +125°C, making it suitable for under-hood automotive sensing, oil & gas downhole tools, and industrial motor drives where ambient temperatures exceed standard commercial-grade limits. This H-grade qualification is confirmed in the Absolute Maximum Ratings table and applies across all electrical specifications unless otherwise noted.
Does the LTC2358HLX-18#PBF require an external reference voltage?
No, the LTC2358HLX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) that can be used directly for conversion. The device also supports external reference injection via the REFIN pin (1.25–2.2V range), but doing so requires disabling the internal buffer by grounding REFIN - a configuration explicitly documented in the Reference Buffer Characteristics section.
How does the SoftSpan™ feature work on the LTC2358HLX-18#PBF?
The SoftSpan™ feature allows each of the eight input channels on the LTC2358HLX-18#PBF to be independently configured per conversion for ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V input ranges via SPI command. This is implemented in hardware using internal resistor networks and range-select switches - no external components or firmware interpolation are needed to achieve full-scale accuracy across ranges.
What digital interface options does the LTC2358HLX-18#PBF support?
The LTC2358HLX-18#PBF supports two pin-selectable digital interfaces: CMOS-level serial (1.8–5V OVDD) with configurable 1–8 data lanes, and LVDS differential serial (2.375–5.25V OVDD). Interface selection is controlled by the LVDS/CMOS pin state at power-up, and timing parameters for both modes - including SCKI period (10ns min for CMOS, 4ns min for LVDS) - are fully specified in the datasheet.
What is the input leakage current specification for the LTC2358HLX-18#PBF at maximum temperature?
At +125°C, the LTC2358HLX-18#PBF specifies a maximum analog input leakage current of 12nA (IIN), measured across all eight channels. This value is guaranteed over the full operating temperature range and is critical for maintaining accuracy with high-impedance sensors such as thermocouples and piezoelectric transducers in extended-temperature industrial deployments.
LTC2358HLX-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 7.5V ~ 38V
- Voltage - Supply, Digital:
- 1.71V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2358HLX-18#PBF FAQ
1.How can I place an order for LTC2358HLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2358HLX-18#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 LTC2358HLX-18#PBF reliable?
The price and inventory of LTC2358HLX-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2358HLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2358HLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2358HLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2358HLX-18#PBF?
LTC2358HLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2358HLX-18#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 LTC2358HLX-18#PBF?
For technical support, including LTC2358HLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2358HLX-18#PBF requirements.
6.How does Aetrix verify that LTC2358HLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2358HLX-18#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 LTC2358HLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2358HLX-18#PBF?
All LTC2358HLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2358HLX-18#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 LTC2358HLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2358HLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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