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Analog Devices Inc. LTC2357HLX-18#PBF
- Part No.:
- LTC2357HLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2357HLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
LTC2357HLX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, quad-channel simultaneous-sampling SAR ADC with picoamp-input buffered differential inputs, ±10.24V true bipolar input range, and 350ksps per channel throughput. It features integrated 4.096V reference buffer, 128dB CMRR, ±3.5LSB INL (max), and operates across –40°C to +125°C for industrial and high-reliability power monitoring systems.
For engineers reviewing the LTC2357HLX-18#PBF datasheet, LTC2357HLX-18#PBF pinout, LTC2357HLX-18#PBF application, or LTC2357HLX-18#PBF equivalent, key selection criteria include per-channel SoftSpan™ reconfigurable input ranges (±10.24V/0–10.24V/±5.12V/0–5.12V), rail-to-rail input overdrive tolerance, LVDS/CMOS serial interface flexibility, and H-grade temperature qualification.
Technical Context
The LTC2357HLX-18#PBF implements a successive approximation register (SAR) architecture with four independent analog front-ends, each incorporating low-leakage picoamp-input buffers enabling direct connection to high-impedance sensors without external signal conditioning. Its wide common-mode input range (VEE + 4V to VCC – 4V, up to 30VP-P) supports direct digitization of signals referenced to non-ground potentials.
Conversion control uses a single CNV pulse per sample cycle with no latency; internal clock generation eliminates external timing components. Input configuration is dynamically selectable per conversion via SPI register writes, supporting mixed-range acquisition across channels - e.g., one channel in ±10.24V mode while another samples 0–5.12V - without hardware reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit, guaranteed no missing codes - ensures full dynamic range utilization in precision measurement without code gaps. |
| Sampling Rate | 350ksps per channel (4-channel simultaneous) - enables real-time capture of fast transients in power line monitoring and motor control. |
| INL (Max) | ±3.5LSB at ±10.24V range - limits absolute accuracy error to ±140μV, critical for calibration-critical instrumentation. |
| SNR (Typ) | 96.4dB at fIN = 2kHz - delivers >15.7 effective number of bits (ENOB), suitable for high-fidelity signal analysis. |
| Input Leakage (H-grade) | 500pA max at 85°C, 12nA max at 125°C - preserves signal integrity when interfacing with megaohm-level sensor sources. |
| CMRR (Typ) | 128dB at 200Hz - rejects common-mode noise from noisy industrial environments such as variable-frequency drives. |
| Interface | Pin-selectable SPI CMOS (1.8–5V) or LVDS - allows layout optimization: CMOS for short-board connections, LVDS for noise-immune long traces. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic LQFP (LX package), RoHS-compliant, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ / IN0– to IN3+ / IN3– | Differential analog inputs (4 channels) | High-impedance buffered inputs accepting ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V ranges independently per channel. |
| CNV | Convert start command | Single-edge-triggered sampling initiation; initiates simultaneous acquisition across all enabled channels with zero-cycle latency. |
| CS / SCKI / SDI / SDO0–SDO3 / SCKO | Serial interface signals | Configurable for CMOS (1.8–5V) or LVDS I/O; supports 1–4 data lanes to balance bus width vs. throughput in system design. |
| REFIN / REFBUF | Reference input/output | REFIN accepts 1.25–2.2V external reference; REFBUF provides regulated 4.096V output (2.5–5V overdriven range) for internal ADC use. |
| VCC / VEE | Analog supply rails | VCC = +7.5V to +38V, VEE = –16.5V to 0V - supports wide high-voltage input signal conditioning without level-shifting circuitry. |
| PD | Power-down control | Active-high signal entering ultra-low-power state (<1μA) for energy-constrained or intermittent-sampling applications. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan™ input range selection | Software-configurable ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V per conversion - eliminates need for external gain-switching circuitry in multi-signal systems. |
| Rail-to-rail input overdrive tolerance | Withstands analog inputs up to VEE – 0.3V and VCC + 0.3V without damage or conversion corruption - simplifies protection design in unpredictable field environments. |
| Integrated reference buffer (4.096V) | Low-drift (5ppm/°C typ), low-noise buffer supplies stable reference to all four ADC cores - removes need for external reference IC and associated decoupling. |
| 128dB CMRR at 200Hz | Rejects common-mode interference from shared ground paths or EMI coupling - essential for accurate measurements in PLC backplanes and motor drive cabinets. |
| Simultaneous sampling with aperture matching | 150ps max aperture delay mismatch between channels - preserves phase coherence for multi-phase power analysis and vibration sensing. |
Applications
| Power Line Monitoring | Industrial Process Control |
|---|---|
Use Scenario: Real-time acquisition of voltage/current waveforms across three-phase AC distribution systems with harmonic analysis up to 50th order. IC Role / Device Role / Timing Role: Simultaneous 4-channel SAR ADC capturing synchronized voltage and current samples at 350ksps/channel for cycle-by-cycle RMS, THD, and power factor calculation. Use Value: ±10.24V input range and 128dB CMRR enable direct connection to isolation amplifiers without attenuation, preserving SNR while rejecting switching noise from adjacent inverters. | Use Scenario: Closed-loop feedback in high-precision chemical dosing systems requiring simultaneous monitoring of pressure, flow, temperature, and valve position. IC Role / Device Role / Timing Role: Quad-channel buffered ADC digitizing 4 isolated sensor outputs with independent SoftSpan™ ranges - e.g., ±5.12V for pressure, 0–10.24V for flow, ±10.24V for thermocouple amplifier output. Use Value: Picoamp input leakage (500pA @ 85°C) prevents loading of high-Z bridge sensors and RTD interfaces, maintaining measurement stability over extended thermal cycles. |
| Test and Measurement Equipment | Programmable Logic Controllers |
Use Scenario: Modular data acquisition unit for benchtop oscilloscopes and waveform analyzers requiring low-noise, high-linearity digitization of DC-coupled signals. IC Role / Device Role / Timing Role: Primary ADC core providing 18-bit resolution and 96.4dB SNR in a compact LQFP package, interfaced via LVDS to reduce digital crosstalk in high-density PCB layouts. Use Value: 150ps aperture matching and <1ns aperture jitter ensure sub-degree phase accuracy in multi-channel time-domain analysis applications. | Use Scenario: High-reliability I/O module in safety-critical PLCs deployed in oil & gas refineries with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Temperature-hardened ADC (H-grade) performing simultaneous analog input scanning in explosion-proof enclosures with minimal thermal derating. Use Value: Guaranteed operation from –40°C to +125°C, combined with 500mW max power dissipation and 53°C/W θJA, enables convection-cooled designs without forced air or heatsinks. |
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, 1MSPS, internal reference, but only ±10V fixed range (no SoftSpan™); 68-pin LQFP; requires external oversampling for equivalent SNR. | Higher channel count and speed, but lacks per-channel range flexibility and lower input leakage (1nA typ). | Select AD7606C-18 when needing >4 channels or >350ksps, accepting fixed input ranges and higher power (220mW). |
| ADS8684 | 18-bit, 4-channel, 500ksps, integrated PGA (±10.24V/±5.12V/±2.56V), but no LVDS option; 64-pin TQFP; 1.5LSB INL (typ) at ±10.24V. | Includes programmable gain amplifier for sensor scaling, but lacks simultaneous sampling and has lower CMRR (100dB). | Select ADS8684 when sensor signal conditioning (gain/offset) is required on-chip and LVDS immunity is not mandatory. |
Compared with AD7606C-18 and ADS8684, the LTC2357HLX-18#PBF uniquely combines per-channel SoftSpan™ reconfigurability, 128dB CMRR, and H-grade temperature rating in a 48-pin LQFP - making it optimal for space-constrained, noise-prone, and thermally demanding industrial DAQ where input signal diversity and robustness are prioritized over raw speed or channel count.
Availability
LTC2357HLX-18#PBF is available at Aetrix Electronics and suitable for power line monitoring, industrial process control, and test and measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2357HLX-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2357 family was designed specifically for high-accuracy, high-voltage industrial data acquisition - emphasizing simultaneous sampling, wide common-mode tolerance, and flexible input ranging to replace complex discrete front-end architectures with a single integrated solution.
FAQ
What is the operating temperature range of the LTC2357HLX-18#PBF?
The LTC2357HLX-18#PBF is rated for continuous operation from –40°C to +125°C, meeting the H-grade specification defined in the datasheet. This extends beyond standard industrial grade (–40°C to +85°C) and qualifies the device for under-hood automotive subsystems, downhole oilfield tools, and high-ambient industrial controllers where thermal margin is critical. The LTC2357HLX-18#PBF maintains full performance specifications including ±3.5LSB INL and 96.4dB SNR across this entire range.
Does the LTC2357HLX-18#PBF require an external reference voltage?
No, the LTC2357HLX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) that can be used directly as the ADC reference. The internal reference output is specified at 4.091V to 4.101V (typ 4.096V) with 5ppm/°C temperature coefficient. An external reference may be applied via REFIN (1.25–2.2V range), but doing so requires disabling the internal buffer by setting REFIN = 0V - a configuration explicitly documented in the datasheet for the LTC2357HLX-18#PBF.
How does the SoftSpan™ feature work on the LTC2357HLX-18#PBF?
The SoftSpan™ feature on the LTC2357HLX-18#PBF allows each of the four input channels to be independently configured - on a per-conversion basis - for one of eight input ranges: ±10.24V, 0–10.24V, ±5.12V, 0–5.12V, ±12.5V, 0–12.5V, ±6.25V, or 0–6.25V. Configuration is performed via SPI register writes before each conversion, enabling dynamic range adaptation without hardware changes. This capability is intrinsic to the LTC2357HLX-18#PBF's architecture and is validated across its full temperature range.
What is the maximum input common-mode voltage range supported by the LTC2357HLX-18#PBF?
The LTC2357HLX-18#PBF supports an input common-mode voltage range of VEE + 4V to VCC – 4V, which - with typical supplies of VCC = +15V and VEE = –15V - yields a usable range of –11V to +11V (30VP-P). This wide common-mode capability enables direct digitization of signals referenced to arbitrary bias points, such as floating current shunts or isolated amplifier outputs, without level-shifting circuitry. The 128dB CMRR at 200Hz ensures rejection of noise within this range.
Can the LTC2357HLX-18#PBF interface directly with an FPGA using LVDS?
Yes, the LTC2357HLX-18#PBF supports pin-selectable LVDS serial output with differential voltage swing of 275–425mV into 100Ω termination, common-mode voltage of 1.1–1.3V, and timing parameters fully compatible with Xilinx and Intel FPGA LVDS receivers. The device provides dedicated SCKO+/– and SDO+/– pairs with skew controlled to ±0.4ns, enabling reliable high-speed data capture at 350ksps/channel without external level translators. This LVDS mode is a native, production-validated interface for the LTC2357HLX-18#PBF.
LTC2357HLX-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 350k
- Number of Inputs:
- 4
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 4
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 7.5V ~ 38V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2357HLX-18#PBF FAQ
1.How can I place an order for LTC2357HLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2357HLX-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 LTC2357HLX-18#PBF reliable?
The price and inventory of LTC2357HLX-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 LTC2357HLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2357HLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2357HLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2357HLX-18#PBF?
LTC2357HLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2357HLX-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 LTC2357HLX-18#PBF?
For technical support, including LTC2357HLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2357HLX-18#PBF requirements.
6.How does Aetrix verify that LTC2357HLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2357HLX-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 LTC2357HLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2357HLX-18#PBF?
All LTC2357HLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2357HLX-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 LTC2357HLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2357HLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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