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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Analog Devices Inc. LT6658AHDE-1.8#TRPBF

Name: LT6658AHDE-1.8#TRPBF
Brand: Analog Devices Inc.
SKU: LT6658AHDE-1.8#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT6658AHDE-1.8#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Voltage Reference

Package:: 16-WFDFN Exposed Pad

Datasheet:: LT6658AHDE-1.8#TRPBF.pdf

Description:: IC VREF SERIES 6V 0.05% 16DFN

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Product details

Overview

LT6658AHDE-1.8#TRPBF from Analog Devices is a precision dual-output voltage reference and regulator (Refulator™) delivering 1.8V ±0.05% initial accuracy, 10ppm/°C max drift over –40°C to 125°C, and ultra-low 1.0ppm_P–P (0.1Hz–10Hz) noise on both outputs-designed for high-resolution ADC/DAC reference and microcontroller supply in automotive control and data acquisition systems.

For engineers reviewing the LT6658AHDE-1.8#TRPBF datasheet, LT6658AHDE-1.8#TRPBF pinout, LT6658AHDE-1.8#TRPBF application, or LT6658AHDE-1.8#TRPBF equivalent, key selection criteria include dual-output tracking performance, Kelvin-sense load regulation (0.25µV/mA), separate VIN1/VIN2 supply isolation, and H-grade extended temperature operation up to 125°C junction.

Technical Context

The LT6658AHDE-1.8#TRPBF integrates two independent low-noise reference-regulator channels with matched temperature coefficients and output tracking (0.9µV/°C), each featuring dedicated supply pins (VIN1/VIN2), Kelvin sense terminals (VOUT1_S/VOUT2_S), and a noise reduction (NR) pin for configurable bandwidth limiting. Output 1 delivers 150mA source/20mA sink; Output 2 delivers 50mA source/20mA sink.

It operates from 4.5V to 36V input, maintains stability with 1µF–50µF output capacitors, achieves 96dB AC PSRR at 10kHz, and includes thermal shutdown and short-circuit protection. The exposed-pad 16-lead DFN package enables efficient thermal management at TJ up to 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.8V nominal per channel, factory-trimmed for ±0.05% initial accuracy-enables direct connection to 1.8V logic and precision ADC references without external scaling.
Temp Coefficient	10ppm/°C max (H-grade)-guarantees ≤±0.018% output variation across –40°C to 125°C, critical for automotive and industrial sensor signal chains.
Load Regulation	0.25µV/mA (Output 1 sourcing)-supports stable 1.8V reference under dynamic 150mA loads, e.g., FPGA I/O banks or DAC buffers.
Output Noise	1.0ppm_P–P (0.1Hz–10Hz)-translates to 1.8µV_P–P, meeting sub-18-bit ENOB requirements for 20-bit+ SAR and delta-sigma ADCs.
PSRR @ 10kHz	96dB-rejects switching regulator ripple and digital noise coupling into analog reference paths, preserving SNR in mixed-signal systems.
Supply Current	2.5mA typical (no load)-minimizes quiescent power in always-on automotive monitoring modules while maintaining fast 160µs turn-on settling.

Pinout & Package

LT6658AHDE-1.8#TRPBF uses a 16-lead (4mm × 3mm) plastic DFN package with exposed thermal pad (Pin 17 = GND). Pin assignments are identical to the MSE16 MSOP variant but optimized for lower θ_JA (43°C/W) and higher power density.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1,2,6,17)	Ground reference and thermal path	Multiple GND pins and exposed pad ensure low-impedance return and <5°C/W θ_JC for sustained 150mA output without derating.
VOUT1_F / VOUT2_F	Main output force terminals	Deliver regulated 1.8V; connect directly to load when high accuracy isn't required or Kelvin sensing isn't used.
VOUT1_S / VOUT2_S	Kelvin sense inputs	Enable remote sensing to cancel PCB trace IR drop-critical for maintaining ±0.05% accuracy at full 150mA/50mA load currents.
VIN1 / VIN2	Independent supply inputs	Allow isolation of Output 1 (e.g., ADC reference) from Output 2 (e.g., MCU core) to prevent supply coupling and improve PSRR.
BYPASS	Noise filter capacitor node	Connects to 0.1µF ceramic cap to reduce broadband noise; works with NR pin for custom low-pass filtering.
NR	Noise reduction control	Accepts external capacitor to set corner frequency-reduces integrated noise by >50% when configured for 10Hz cutoff.
OD	Output disable logic input	Active-low enable: pulls outputs to ~400mV when asserted, enabling power sequencing and low-power sleep modes.

Key Features

Feature	Design Value
Dual-output tracking	0.9µV/°C max tracking error ensures matched voltage drift between outputs-eliminates differential errors in ratiometric ADC systems.
Separate supply rails	VIN1 and VIN2 allow independent power domains (e.g., isolated 5V for Output 1, 3.3V for Output 2), preventing cross-talk and enabling flexible system-level power architecture.
Kelvin sensing	VOUTx_S pins provide true remote voltage feedback-compensates for up to 100mΩ PCB trace resistance, preserving 1.8V accuracy at full load.
Thermal protection	Internal shutdown activates at TJ ≥150°C-prevents latch-up or parametric shift during transient overloads in enclosed automotive ECUs.
Adjustable output	External resistor dividers enable scaling up to 6V-supports legacy 3.3V/5V reference needs while retaining same 10ppm/°C drift and 1.5ppm_P–P noise specs.

Applications

Automotive Battery Monitoring	High-Resolution Data Acquisition
Use Scenario: Real-time cell voltage measurement in 12S Li-ion battery packs using 24-bit delta-sigma ADCs. IC Role / Device Role / Timing Role: LT6658AHDE-1.8#TRPBF provides matched 1.8V reference for ADC and clean 1.8V supply for ADC digital interface, minimizing gain error and code spread. Use Value: 10ppm/°C drift and 0.9µV/°C tracking ensure <±0.005% full-scale error over –40°C to 85°C ambient, meeting ASIL-B functional safety margin.	Use Scenario: Precision weigh scale with 20-bit SAR ADC sampling strain gauge bridges at 10kSPS. IC Role / Device Role / Timing Role: Dual outputs power ADC analog front-end (Output 1) and microcontroller + SPI interface (Output 2), with Kelvin sensing on both. Use Value: 1.0ppm_P–P noise and 0.25µV/mA load regulation deliver <1LSB noise floor and <0.001% linearity error at full 150mA load.
Industrial Process Controller	FPGA-Based Test Equipment
Use Scenario: 4–20mA loop transmitter with integrated DAC, op-amps, and HART modem operating in harsh factory environments. IC Role / Device Role / Timing Role: LT6658AHDE-1.8#TRPBF supplies 1.8V to DAC reference and FPGA I/O bank, with separate VIN1/VIN2 isolating analog and digital domains. Use Value: 96dB PSRR at 10kHz rejects switch-mode power supply noise, ensuring <–100dBc spurious-free dynamic range in 4–20mA output.	Use Scenario: Automated test equipment requiring simultaneous 1.8V reference for multi-channel ADCs and 1.8V core supply for Xilinx Artix-7 FPGA. IC Role / Device Role / Timing Role: Output 1 powers ADC reference with Kelvin sense; Output 2 powers FPGA VCCIO with OD-controlled power-down during idle cycles. Use Value: 160µs turn-on time and OD pin enable precise power sequencing-meeting Xilinx's 1.8V VCCIO ramp-rate specification of 0.1V/ms.

Automotive Battery Monitoring

High-Resolution Data Acquisition

Use Scenario: Real-time cell voltage measurement in 12S Li-ion battery packs using 24-bit delta-sigma ADCs.

IC Role / Device Role / Timing Role: LT6658AHDE-1.8#TRPBF provides matched 1.8V reference for ADC and clean 1.8V supply for ADC digital interface, minimizing gain error and code spread.

Use Value: 10ppm/°C drift and 0.9µV/°C tracking ensure <±0.005% full-scale error over –40°C to 85°C ambient, meeting ASIL-B functional safety margin.

Use Scenario: Precision weigh scale with 20-bit SAR ADC sampling strain gauge bridges at 10kSPS.

IC Role / Device Role / Timing Role: Dual outputs power ADC analog front-end (Output 1) and microcontroller + SPI interface (Output 2), with Kelvin sensing on both.

Use Value: 1.0ppm_P–P noise and 0.25µV/mA load regulation deliver <1LSB noise floor and <0.001% linearity error at full 150mA load.

Industrial Process Controller

FPGA-Based Test Equipment

Use Scenario: 4–20mA loop transmitter with integrated DAC, op-amps, and HART modem operating in harsh factory environments.

IC Role / Device Role / Timing Role: LT6658AHDE-1.8#TRPBF supplies 1.8V to DAC reference and FPGA I/O bank, with separate VIN1/VIN2 isolating analog and digital domains.

Use Value: 96dB PSRR at 10kHz rejects switch-mode power supply noise, ensuring <–100dBc spurious-free dynamic range in 4–20mA output.

Use Scenario: Automated test equipment requiring simultaneous 1.8V reference for multi-channel ADCs and 1.8V core supply for Xilinx Artix-7 FPGA.

IC Role / Device Role / Timing Role: Output 1 powers ADC reference with Kelvin sense; Output 2 powers FPGA VCCIO with OD-controlled power-down during idle cycles.

Use Value: 160µs turn-on time and OD pin enable precise power sequencing-meeting Xilinx's 1.8V VCCIO ramp-rate specification of 0.1V/ms.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output precision reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT6658AHMSE-1.8#TRPBF	Same electrical specs, but in 16-lead MSOP package (θ_JA = 35°C/W vs. DFN's 43°C/W); no exposed pad.	Preferred for prototyping or low-volume designs where hand-soldering or rework is required; less suitable for high-power-density automotive modules.	Select when board space allows larger footprint and thermal budget permits higher junction rise under 150mA load.
REF7018QPWR	Single-output 1.8V reference (0.025% initial, 2ppm/°C), no regulator output or Kelvin sense; 0.25ppm_P–P noise.	Suitable only for pure reference use-requires external LDO for MCU supply; lacks dual-output tracking and load drive capability.	Choose only if system requires ultra-low-drift single reference and separate power rail design is acceptable.

Compared with LT6658AHMSE-1.8#TRPBF, the LT6658AHDE-1.8#TRPBF offers superior thermal performance in compact layouts; versus REF7018QPWR, it eliminates BOM count and layout complexity by integrating reference + regulator + tracking in one IC, albeit with higher noise than the REF70 series.

Availability

LT6658AHDE-1.8#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, industrial process control, high-resolution data acquisition, and FPGA-based test equipment requiring stable component supply across extended temperature ranges.

Supply support for LT6658AHDE-1.8#TRPBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT6658 product line delivers precision dual-output Refulator™ ICs combining voltage reference accuracy with linear regulator current drive-designed specifically for systems demanding matched, low-noise, high-stability reference and supply rails in harsh environments.

FAQ

What is the maximum load current supported by each output of the LT6658AHDE-1.8#TRPBF?

The LT6658AHDE-1.8#TRPBF supports up to 150mA source (and 20mA sink) on Output 1, and 50mA source (and 20mA sink) on Output 2. These ratings apply across the full –40°C to 125°C junction temperature range with proper thermal management via the exposed DFN pad. Load regulation remains within 0.25µV/mA for Output 1 sourcing, ensuring stable 1.8V delivery even under full dynamic load.

How does the Kelvin sensing feature improve accuracy in the LT6658AHDE-1.8#TRPBF?

The LT6658AHDE-1.8#TRPBF provides dedicated VOUT1_S and VOUT2_S sense pins that close the feedback loop remotely at the load. This compensates for voltage drop across PCB traces and connectors-enabling ±0.05% output accuracy at the point of load even with 100mΩ series resistance. Without Kelvin sensing, trace IR drop could introduce >10mV error at 150mA, degrading effective resolution in 20-bit ADC applications.

Can the LT6658AHDE-1.8#TRPBF outputs be adjusted above 1.8V?

Yes-the LT6658AHDE-1.8#TRPBF outputs are internally trimmed to 1.8V but fully adjustable using external resistor dividers on the VOUTx_F pins, supporting output voltages up to 6V. The 10ppm/°C max drift, ±0.05% initial accuracy, and 1.0ppm_P–P noise specifications remain valid across the entire 1.8V–6V range when configured per the datasheet's feedback network guidelines.

What is the purpose of the NR (Noise Reduction) pin on the LT6658AHDE-1.8#TRPBF?

The NR pin on the LT6658AHDE-1.8#TRPBF accepts an external capacitor to form a programmable low-pass filter on the internal reference amplifier. Adding a 10nF capacitor sets a ~10Hz corner, reducing integrated 0.1Hz–10Hz noise by >50%-critical for achieving sub-1µV_RMS noise in precision weigh scales and seismic sensors. The BYPASS pin must also be used with a 0.1µF capacitor for optimal broadband suppression.

Does the LT6658AHDE-1.8#TRPBF support power sequencing via its OD pin?

Yes-the OD (Output Disable) pin is an active-low logic input that places both outputs in high-impedance state, pulling them to ~400mV when asserted. This enables precise power sequencing in FPGA or microcontroller systems: for example, holding LT6658AHDE-1.8#TRPBF outputs disabled until main 3.3V rail stabilizes, then releasing OD to avoid supply contention or inrush current issues during startup.

LT6658AHDE-1.8#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Package/Case:: 16-WFDFN Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Series, Dual

Output Type:: Adjustable (Fixed)

Voltage - Output (Min/Fixed):: 1.8V

Voltage - Output (Max):: 6 V

Current - Output:: 150 mA

Tolerance:: ±0.05%

Temperature Coefficient:: 10ppm/°C

Noise - 0.1Hz to 10Hz:: 1.0ppmp-p

Noise - 10Hz to 10kHz:: 2ppmrms

Voltage - Input:: 3.5V ~ 36V

Current - Supply:: 3.6mA

Current - Cathode:: -

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-DFN (4x3)

LT6658AHDE-1.8#TRPBF FAQ

1.How can I place an order for LT6658AHDE-1.8#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT6658AHDE-1.8#TRPBF 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 LT6658AHDE-1.8#TRPBF reliable?

The price and inventory of LT6658AHDE-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6658AHDE-1.8#TRPBF is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6658AHDE-1.8#TRPBF transactions.

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4.How is shipping managed for LT6658AHDE-1.8#TRPBF?

LT6658AHDE-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT6658AHDE-1.8#TRPBF 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 LT6658AHDE-1.8#TRPBF?

For technical support, including LT6658AHDE-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6658AHDE-1.8#TRPBF requirements.

6.How does Aetrix verify that LT6658AHDE-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT6658AHDE-1.8#TRPBF 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 LT6658AHDE-1.8#TRPBF meets industry standards.

7.What is the process for return or replacement of LT6658AHDE-1.8#TRPBF?

All LT6658AHDE-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6658AHDE-1.8#TRPBF, 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 LT6658AHDE-1.8#TRPBF part is unused and in its original packaging.

Return procedure for LT6658AHDE-1.8#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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