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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc. ADA4940-1ARZ-RL

Name: ADA4940-1ARZ-RL
Brand: Analog Devices Inc.
SKU: ADA4940-1ARZ-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADA4940-1ARZ-RL

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ADA4940-1ARZ-RL.pdf

Description:: IC OPAMP DIFF 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ADA4940-1ARZ-RL from Analog Devices is an ultralow-power, fully differential ADC driver amplifier optimized for single-ended-to-differential conversion in high-resolution SAR ADC signal chains. It delivers 260 MHz small-signal bandwidth, −122 dB THD at 50 kHz, and 3.9 nV/√Hz input voltage noise while consuming only 1.25 mA quiescent current, enabling precision data acquisition in portable and low-power industrial systems.

For engineers reviewing the ADA4940-1ARZ-RL datasheet, ADA4940-1ARZ-RL pinout, ADA4940-1ARZ-RL application, or ADA4940-1ARZ-RL equivalent, this page provides verified package mapping (16-lead LFCSP), confirmed pin functions, real-world distortion and noise performance at 50 kHz/1 MHz, rail-to-rail output swing (−VS + 0.1 V to +VS − 0.1 V), and validated alternatives for low-power differential driving applications.

Technical Context

The ADA4940-1ARZ-RL employs a SiGe complementary bipolar process to achieve ultralow distortion and 3.9 nV/√Hz input voltage noise. Its internal common-mode feedback loop ensures exceptional output balance and suppresses even-order harmonics, critical for driving 16-bit SAR ADCs up to 1 MHz.

It supports flexible gain configuration via external resistor networks (e.g., RF = RG = 1 kΩ for G = 1), features an adjustable VOCM input for matching ADC input common-mode requirements, and includes a dedicated DISABLE pin reducing quiescent current to 13.5–28.5 µA when asserted.

Key Specifications

Parameter	Value and Actual Design Meaning
Small-signal bandwidth	260 MHz at G = 1, enabling accurate amplification of fast transient signals in high-speed data acquisition.
THD @ 50 kHz	−122 dB, ensuring minimal harmonic contamination for 16-bit ADCs operating near DC to audio frequencies.
Input voltage noise	3.9 nV/√Hz, preserving SNR integrity in low-amplitude sensor and medical imaging front-ends.
Quiescent current	1.25 mA typical, supporting battery-powered and thermally constrained embedded designs.
Output swing	Rail-to-rail: −VS + 0.1 V to +VS − 0.1 V, maximizing dynamic range into ADC inputs with limited supply headroom.
Settling time	34 ns to 0.1%, meeting timing budgets for 1 MSPS+ SAR converters requiring fast settling after multiplexer switching.
VOCM adjustment range	−VS + 0.8 V to +VS − 0.7 V, allowing precise alignment with diverse ADC input common-mode voltage requirements.

Pinout & Package

The ADA4940-1ARZ-RL is packaged in a 3 mm × 3 mm, 16-lead LFCSP with exposed pad (EPAD) that must be connected to −VS or ground per datasheet Note 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (−FB)	Negative output feedback node	Connects to feedback resistor network for closed-loop gain control and stability compensation.
2 (+IN)	Positive input summing node	Accepts single-ended or differential input signal; high-impedance (50 MΩ common-mode) interface point.
3 (−IN)	Negative input summing node	Completes differential input pair; matched to +IN for optimal CMRR and offset rejection.
4 (+FB)	Positive output feedback node	Completes symmetrical feedback path; enables balanced gain-setting with −FB for minimal imbalance error.
5–8 (+VS)	Positive supply voltage rails	Four parallel pins reduce supply impedance and improve PSRR; supports 3 V to 7 V operation.
9 (VOCM)	Output common-mode voltage control	DC-biased input sets differential output midpoint; critical for matching ADC input common-mode range.
10 (+OUT)	Positive differential output	Drives one leg of ADC differential input; rail-to-rail swing supports full-scale utilization.
11 (−OUT)	Negative differential output	Complementary output leg; internal feedback ensures <−60 dB balance error at 1 MHz.
12 (DISABLE)	Power-down control input	Logic-low (≤−VS + 1 V) disables amplifier, reducing I_Q to ≤28.5 µA for power gating in idle cycles.
13–16 (−VS)	Negative supply voltage rails	Four parallel pins lower ground bounce and thermal resistance; EPAD connection required for thermal performance.

Key Features

Feature	Design Value
Ultralow power consumption	1.25 mA quiescent current enables >10-year battery life in portable instrumentation and IoT edge nodes.
Adjustable output common-mode voltage	VOCM input accepts DC bias from −VS + 0.8 V to +VS − 0.7 V, eliminating level-shifting components for ADC interface.
Exceptional harmonic distortion suppression	−122 dB THD at 50 kHz and −96 dB THD at 1 MHz ensure clean spectral purity for high-SNR data conversion.
Rail-to-rail output swing	Delivers −VS + 0.1 V to +VS − 0.1 V per output, maximizing usable dynamic range into 5 V or 3.3 V ADCs.
Dedicated disable function	Turn-off time <10 µs and turn-on time 0.6 µs support rapid power cycling in time-sliced measurement systems.

Applications

Low-Power SAR ADC Driving	Single-Ended to Differential Conversion
Use Scenario: Driving AD7982 (18-bit, 1 MSPS) in handheld metering equipment powered by coin-cell batteries. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shift, and distortion-free signal conditioning before ADC sampling. Use Value: 1.25 mA I_Q extends battery life; −122 dBc HD2/HD3 preserves 18-bit ENOB; VOCM adjust matches AD7982's 0.5 V to 2.5 V input range.	Use Scenario: Converting output of single-ended MEMS pressure sensor (0–2.5 V) to differential format for noise-immune transmission over PCB traces. IC Role / Device Role / Timing Role: Precision single-ended-to-differential converter with matched gain paths and ultra-low offset (±0.06 mV). Use Value: 3.9 nV/√Hz noise floor prevents degradation of sensor microvolt-level signals; 34 ns settling ensures fidelity across 100 kHz sensor bandwidth.
Medical Imaging Front-End	Industrial Process Control Loop
Use Scenario: Signal conditioning stage in portable ultrasound beamformer receiving analog echo returns from piezoelectric transducers. IC Role / Device Role / Timing Role: Low-noise, low-distortion differential driver feeding 16-bit Σ-Δ ADCs sampling at 1–5 MSPS. Use Value: −110 dB crosstalk isolates channels; 260 MHz bandwidth supports wideband RF envelope detection; rail-to-rail swing maximizes ADC utilization.	Use Scenario: Isolating and scaling 4–20 mA current loop outputs in PLC analog input modules operating across −40°C to +125°C ambient. IC Role / Device Role / Timing Role: High-accuracy differential buffer with robust PSRR (90 dB) and CMRR (119 dB) for noisy factory environments. Use Value: 1.2 µV/°C offset drift maintains calibration stability; 86–119 dB CMRR rejects common-mode noise from motor drives and solenoids.

Low-Power SAR ADC Driving

Single-Ended to Differential Conversion

Use Scenario: Driving AD7982 (18-bit, 1 MSPS) in handheld metering equipment powered by coin-cell batteries.

IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shift, and distortion-free signal conditioning before ADC sampling.

Use Value: 1.25 mA I_Q extends battery life; −122 dBc HD2/HD3 preserves 18-bit ENOB; VOCM adjust matches AD7982's 0.5 V to 2.5 V input range.

Use Scenario: Converting output of single-ended MEMS pressure sensor (0–2.5 V) to differential format for noise-immune transmission over PCB traces.

IC Role / Device Role / Timing Role: Precision single-ended-to-differential converter with matched gain paths and ultra-low offset (±0.06 mV).

Use Value: 3.9 nV/√Hz noise floor prevents degradation of sensor microvolt-level signals; 34 ns settling ensures fidelity across 100 kHz sensor bandwidth.

Medical Imaging Front-End

Industrial Process Control Loop

Use Scenario: Signal conditioning stage in portable ultrasound beamformer receiving analog echo returns from piezoelectric transducers.

IC Role / Device Role / Timing Role: Low-noise, low-distortion differential driver feeding 16-bit Σ-Δ ADCs sampling at 1–5 MSPS.

Use Value: −110 dB crosstalk isolates channels; 260 MHz bandwidth supports wideband RF envelope detection; rail-to-rail swing maximizes ADC utilization.

Use Scenario: Isolating and scaling 4–20 mA current loop outputs in PLC analog input modules operating across −40°C to +125°C ambient.

IC Role / Device Role / Timing Role: High-accuracy differential buffer with robust PSRR (90 dB) and CMRR (119 dB) for noisy factory environments.

Use Value: 1.2 µV/°C offset drift maintains calibration stability; 86–119 dB CMRR rejects common-mode noise from motor drives and solenoids.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADA4941-1ARMZ-R7	Higher quiescent current (2.2 mA), lower bandwidth (31 MHz), higher input noise (5.1 nV/√Hz).	Better suited for lower-frequency, higher-precision applications where power is less constrained than bandwidth.	Select ADA4941-1ARMZ-R7 when THD <−110 dB below 100 kHz is prioritized over 260 MHz bandwidth and 1.25 mA power.
AD8137ARZ-R7	Higher quiescent current (3 mA), lower bandwidth (110 MHz), higher input noise (8.25 nV/√Hz), no VOCM pin.	Lacks adjustable common-mode output; requires external resistive divider for level setting, increasing component count and error sources.	Choose AD8137ARZ-R7 only if VOCM control is unnecessary and legacy design reuse justifies higher noise and power.

Compared with ADA4940-1ARZ-RL, ADA4941-1ARMZ-R7 trades bandwidth and power efficiency for improved low-frequency THD, while AD8137ARZ-R7 sacrifices VOCM flexibility and noise performance for broader availability and simpler layout-neither offers pin compatibility or identical electrical behavior.

Availability

ADA4940-1ARZ-RL is available at Aetrix Electronics and suitable for low-power SAR ADC driving, single-ended-to-differential conversion, medical imaging front-ends, industrial process controls, and portable electronics requiring stable component supply across extended temperature ranges.

Supply support for ADA4940-1ARZ-RL 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, headquartered in Norwood, MA, with R&D and manufacturing infrastructure spanning North America, Europe, and Asia.

The ADA4940 family was designed specifically for ultralow-power, high-fidelity differential signal conditioning in precision data acquisition systems-targeting 16–18-bit SAR and Σ-Δ ADC interfaces where noise, distortion, and supply current are critical constraints.

FAQ

What is the maximum supply voltage for ADA4940-1ARZ-RL?

The absolute maximum supply voltage for ADA4940-1ARZ-RL is 8 V across +VS and −VS pins. The recommended operating range is 3 V to 7 V for the LFCSP package, as specified in Table 5 and Table 8 of the Rev. E datasheet. Exceeding 8 V risks permanent damage per Absolute Maximum Ratings (Table 9).

Does ADA4940-1ARZ-RL support rail-to-rail output swing?

Yes, ADA4940-1ARZ-RL supports rail-to-rail output swing: each single-ended output delivers −VS + 0.1 V to +VS − 0.1 V under typical conditions (Table 3). This enables full utilization of ADC input ranges without external level-shifting circuitry, especially valuable in 3 V and 5 V systems.

How does the DISABLE pin function on ADA4940-1ARZ-RL?

The DISABLE pin on ADA4940-1ARZ-RL asserts power-down mode when driven to ≤(−VS + 1) V, reducing quiescent current to 13.5–28.5 µA. When ≥(−VS + 1.8) V, the amplifier operates normally. Turn-on time is 0.6 µs and turn-off time is 10 µs (Table 5), enabling rapid power gating in duty-cycled systems.

What is the input voltage noise density of ADA4940-1ARZ-RL?

The input voltage noise density of ADA4940-1ARZ-RL is 3.9 nV/√Hz at 100 kHz (Tables 3 and 6), consistent across both 3 V and 5 V supplies. This ultralow noise value is critical for preserving signal integrity in high-resolution sensor interfaces and medical imaging applications.

Can ADA4940-1ARZ-RL drive capacitive loads?

ADA4940-1ARZ-RL can drive moderate capacitive loads, but stability depends on external compensation. Figure 19 shows frequency response degradation with C_COM1/C_COM2 ≥ 0.5 pF; for >10 pF loads, series isolation resistors or feedback capacitor adjustments are recommended per "Driving a Capacitive Load" section (Page 26).

ADA4940-1ARZ-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: Differential

Number of Circuits:: 1

Output Type:: Differential

Slew Rate:: 95V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 260 MHz

Current - Input Bias:: 1.1 µA

Voltage - Input Offset:: 60 µV

Current - Supply:: 1.25mA

Current - Output / Channel:: 46 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 6 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

ADA4940-1ARZ-RL FAQ

1.How can I place an order for ADA4940-1ARZ-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for ADA4940-1ARZ-RL 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 ADA4940-1ARZ-RL reliable?

The price and inventory of ADA4940-1ARZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4940-1ARZ-RL is usually 5 days.

3.What payment methods are accepted for ADA4940-1ARZ-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4940-1ARZ-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADA4940-1ARZ-RL?

ADA4940-1ARZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADA4940-1ARZ-RL 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 ADA4940-1ARZ-RL?

For technical support, including ADA4940-1ARZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4940-1ARZ-RL requirements.

6.How does Aetrix verify that ADA4940-1ARZ-RL is sourced from the original manufacturer or authorized distributors?

All ADA4940-1ARZ-RL 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 ADA4940-1ARZ-RL meets industry standards.

7.What is the process for return or replacement of ADA4940-1ARZ-RL?

All ADA4940-1ARZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4940-1ARZ-RL, 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 ADA4940-1ARZ-RL part is unused and in its original packaging.

Return procedure for ADA4940-1ARZ-RL:

1.Submit a request within 90 days.

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

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