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Home > Products > Integrated Circuits (ICs) > Linear > Special Purpose Amplifiers

Analog Devices Inc. AD8331ARQ-REEL7

Name: AD8331ARQ-REEL7
Brand: Analog Devices Inc.
SKU: AD8331ARQ-REEL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD8331ARQ-REEL7

Manufacturer:: Analog Devices Inc.

Category:: Special Purpose Amplifiers

Package:: 20-SSOP (0.154", 3.90mm Width)

Datasheet:: AD8331ARQ-REEL7.pdf

Description:: IC VGAIN AMP 20QSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD8331ARQ-REEL7 from Analog Devices is a single-channel, ultralow-noise, linear-in-dB variable gain amplifier (VGA) with integrated preamplifier and programmable input impedance. It delivers 19 dB LNA gain, 120 MHz −3 dB bandwidth, 0.74 nV/√Hz input voltage noise, and operates from a single 5 V supply. It is optimized for ultrasound time-gain control and high-speed ADC driver applications requiring stable gain accuracy and low distortion.

For engineers reviewing the AD8331ARQ-REEL7 datasheet, AD8331ARQ-REEL7 pinout, AD8331ARQ-REEL7 application, or AD8331ARQ-REEL7 equivalent, key selection criteria include its 48 dB gain range (−4.5 dB to +43.5 dB in LO mode), differential output architecture, active input impedance matching via R_IZ, and clamping-level programmability for ADC protection.

Technical Context

The AD8331ARQ-REEL7 integrates three core signal-path stages: an ultralow-noise LNA (0.74 nV/√Hz, 2.5 pA/√Hz), an X-AMP® VGA with 48 dB linear-in-dB gain control (50 dB/V scaling), and a selectable postamplifier (3.5 dB or 15.5 dB). Its LNA supports single-ended input and differential outputs, with input resistance adjustable from 50 Ω to 6 kΩ using external R_IZ.

Gain control is implemented via a precision analog voltage interface (0–1.0 V), delivering ±0.3 dB absolute gain error over 0.1–0.95 V and ±0.1 dB channel-to-channel matching. The device maintains group delay variation of ±2 ns across 5–50 MHz and achieves −72 dBc IMD3 at 10 MHz, enabling high-fidelity I/Q and sonar signal conditioning.

Key Specifications

Parameter	Value and Actual Design Meaning
LNA Gain	19 dB (single-ended input to differential output; sets baseline SNR before VGA)
−3 dB Bandwidth	120 MHz (full small-signal bandwidth at mid-gain; supports ultrasound and wideband AGC)
Input Voltage Noise	0.74 nV/√Hz (enables detection of weak signals without degrading system noise floor)
Output-Referred Noise	48 nV/√Hz (LO gain mode; ensures clean drive into 10-/12-bit ADCs without added quantization penalty)
Gain Range	−4.5 dB to +43.5 dB (LO mode); enables >48 dB dynamic range compression in TGC loops)
Supply Voltage	4.5 V to 5.5 V (single 5 V rail simplifies power design; PSRR = −68 dB at 100 kHz)
Quiescent Current	25 mA per channel (125 mW total; balances performance and thermal management in QSOP)
Operating Temp	−40°C to +85°C (supports industrial and medical equipment deployment without derating)

Pinout & Package

AD8331ARQ-REEL7 is housed in a 20-lead QSOP (RQ) package with exposed pad for thermal and electrical grounding. Pin functions are validated per Analog Devices Rev. I datasheet Figure 3 and Table 3.

Pin/Terminal	Circuit Role	Design Meaning
LMD	LNA midsupply bypass	Connects to 0.1 µF capacitor to stabilize LNA bias; critical for HF noise suppression
INH	LNA input	Single-ended RF input node; accepts ±275 mV AC-coupled signal
VPSL	LNA supply	Dedicated 5 V rail for LNA stage; decoupling required for PSRR integrity
LOP / LON	LNA differential outputs	Drive VGA inputs; 5 Ω output impedance enables direct connection to VIP/VIN
VIP / VIN	VGA differential inputs	Accept LNA outputs; internal termination minimizes reflections at 120 MHz
GAIN	Analog gain control	0–1.0 V interface with 50 dB/V scaling; 10 MΩ input impedance avoids loading
HILO	Gain range select	Logic-controlled switch between LO (−4.5 to +43.5 dB) and HI (7.5 to 55.5 dB) modes
RCLMP	Clamp level set	External resistor defines output voltage limit to prevent ADC saturation
VCM	Common-mode reference	Sets output common-mode level (1.5–3.5 V range); critical for ADC input compliance
VOH / VOL	VGA differential outputs	Low-impedance (1 Ω DC) differential outputs; deliver up to ±1.125 V swing into ≥500 Ω

Key Features

Feature	Design Value
Ultralow-noise LNA	0.74 nV/√Hz voltage noise + 2.5 pA/√Hz current noise enables sub-mV signal recovery
Programmable R_IN	Adjustable 50 Ω to 6 kΩ input resistance via R_IZ; matches transducer or source without noise penalty
Differential signal path	Suppresses even-order harmonics and crosstalk; achieves −88 dBc HD2 at 1 MHz
Selectable postamp gain	3.5 dB or 15.5 dB pin-selectable gain optimizes noise vs. headroom for 10-bit or 12-bit ADCs
Output clamping	User-defined clamping via R_CLMP prevents ADC overload during transient events
Linear-in-dB gain law	±0.2 dB conformance over 0.1–0.95 V ensures predictable, repeatable gain control in closed-loop AGC

Applications

Ultrasound Time-Gain Control (TGC)	High-Speed Dual ADC Driver
Use Scenario: Compensates for acoustic attenuation in real-time B-mode imaging by dynamically increasing gain with depth. IC Role / Device Role / Timing Role: Single-channel VGA with programmable R_IN and clamping, placed between transducer receive chain and ADC. Use Value: 120 MHz bandwidth and 0.74 nV/√Hz noise preserve image resolution and contrast at 5–15 MHz center frequencies.	Use Scenario: Drives two interleaved 10-bit/12-bit ADCs in I/Q demodulation paths for radar or communications receivers. IC Role / Device Role / Timing Role: Differential VGA with matched gain and phase response across channels; provides gain-adjustable baseband signal conditioning. Use Value: ±0.1 dB channel-to-channel gain matching and ±2 ns group delay variation ensure <−98 dB crosstalk and coherent I/Q sampling.
Automatic Gain Control (AGC) Loop	Low-Distortion Sonar Receiver
Use Scenario: Stabilizes signal amplitude in wide-dynamic-range RF front ends where input levels vary >60 dB. IC Role / Device Role / Timing Role: Core gain element in feedback-controlled loop; GAIN pin driven by RMS detector or DSP. Use Value: 48 dB linear-in-dB range and 500 ns response time enable fast, monotonic settling without overshoot or instability.	Use Scenario: Receives weak echo returns in underwater navigation systems operating at 100–500 kHz. IC Role / Device Role / Timing Role: Low-noise preamp + VGA stage with active impedance matching to piezoelectric hydrophones. Use Value: Adjustable 50–200 Ω input resistance maximizes power transfer while maintaining 2.5 dB noise figure at 10 MHz.

Ultrasound Time-Gain Control (TGC)

High-Speed Dual ADC Driver

Use Scenario: Compensates for acoustic attenuation in real-time B-mode imaging by dynamically increasing gain with depth.

IC Role / Device Role / Timing Role: Single-channel VGA with programmable R_IN and clamping, placed between transducer receive chain and ADC.

Use Value: 120 MHz bandwidth and 0.74 nV/√Hz noise preserve image resolution and contrast at 5–15 MHz center frequencies.

Use Scenario: Drives two interleaved 10-bit/12-bit ADCs in I/Q demodulation paths for radar or communications receivers.

IC Role / Device Role / Timing Role: Differential VGA with matched gain and phase response across channels; provides gain-adjustable baseband signal conditioning.

Use Value: ±0.1 dB channel-to-channel gain matching and ±2 ns group delay variation ensure <−98 dB crosstalk and coherent I/Q sampling.

Automatic Gain Control (AGC) Loop

Low-Distortion Sonar Receiver

Use Scenario: Stabilizes signal amplitude in wide-dynamic-range RF front ends where input levels vary >60 dB.

IC Role / Device Role / Timing Role: Core gain element in feedback-controlled loop; GAIN pin driven by RMS detector or DSP.

Use Value: 48 dB linear-in-dB range and 500 ns response time enable fast, monotonic settling without overshoot or instability.

Use Scenario: Receives weak echo returns in underwater navigation systems operating at 100–500 kHz.

IC Role / Device Role / Timing Role: Low-noise preamp + VGA stage with active impedance matching to piezoelectric hydrophones.

Use Value: Adjustable 50–200 Ω input resistance maximizes power transfer while maintaining 2.5 dB noise figure at 10 MHz.

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD8332ARUZ	Dual-channel, 100 MHz bandwidth, 145 mW/channel, TSSOP-28 package	Supports simultaneous I/Q processing; requires separate gain control per channel	Choose when dual independent VGAs are needed and board space allows larger footprint
AD8370ACPZ-R7	Single-channel, 750 MHz bandwidth, 2.7 nV/√Hz noise, 24 dB gain range, LFCSP-24	Higher-frequency operation but higher noise; lacks programmable R_IN and clamping	Choose for RF IF gain control above 200 MHz where bandwidth outweighs noise sensitivity

Compared with AD8332ARUZ, AD8331ARQ-REEL7 offers superior noise performance and integrated clamping for ADC protection, while AD8370ACPZ-R7 trades noise floor for bandwidth-making AD8331ARQ-REEL7 optimal for precision low-frequency wide-dynamic-range analog front ends.

Availability

AD8331ARQ-REEL7 is available at Aetrix Electronics and suitable for ultrasound imaging systems, high-performance AGC circuits, I/Q signal processors, and high-speed ADC driver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD8331ARQ-REEL7 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.

The AD833x family was designed specifically for medical ultrasound and high-fidelity instrumentation front ends, emphasizing ultralow noise, precise gain linearity, and robust differential signal integrity at multi-MHz frequencies.

FAQ

What is the maximum small-signal bandwidth of the AD8331ARQ-REEL7?

The AD8331ARQ-REEL7 achieves a −3 dB small-signal bandwidth of 120 MHz under standard test conditions (V_OUT = 0.2 V p-p). This bandwidth is maintained across the full 48 dB gain range, making it suitable for ultrasound and wideband AGC applications up to 120 MHz.

How does the programmable input impedance work on the AD8331ARQ-REEL7?

The AD8331ARQ-REEL7 uses an external resistor (R_IZ) connected to the LMD pin to set the LNA's input resistance from 50 Ω to 6 kΩ. With R_IZ = 280 Ω, input resistance is 50 Ω-ideal for 50 Ω transducer interfaces-without degrading the 0.74 nV/√Hz noise performance.

Can the AD8331ARQ-REEL7 drive a 12-bit ADC directly?

Yes, the AD8331ARQ-REEL7 is explicitly optimized for 10-bit and 12-bit ADCs. Its low 48 nV/√Hz output-referred noise (LO gain), differential outputs, and user-selectable clamping level prevent ADC overload while preserving ENOB. Postamp gain is pin-selectable to 3.5 dB or 15.5 dB for optimal ADC utilization.

What is the purpose of the RCLMP pin on the AD8331ARQ-REEL7?

The RCLMP pin on the AD8331ARQ-REEL7 sets the output clamping voltage via an external resistor. When enabled, this feature limits the differential output swing to a user-defined level-preventing saturation of downstream ADCs during large transient inputs. Clamping accuracy is ±50 mV in LO gain mode.

Does the AD8331ARQ-REEL7 support both positive and negative gain slope configurations?

Yes, the MODE pin on the AD8331ARQ-REEL7 selects gain slope polarity: logic low (0–1.0 V) yields positive gain slope (gain increases with GAIN voltage), while logic high (2.25–5 V) yields negative slope. This flexibility supports both forward and reverse AGC loop architectures without external inversion.

AD8331ARQ-REEL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: X-AMP®

Package/Case:: 20-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Variable Gain Amplifier

Applications:: Signal Processing

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 20-QSOP

AD8331ARQ-REEL7 FAQ

1.How can I place an order for AD8331ARQ-REEL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD8331ARQ-REEL7 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 AD8331ARQ-REEL7 reliable?

The price and inventory of AD8331ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8331ARQ-REEL7 is usually 5 days.

3.What payment methods are accepted for AD8331ARQ-REEL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8331ARQ-REEL7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD8331ARQ-REEL7?

AD8331ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD8331ARQ-REEL7 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 AD8331ARQ-REEL7?

For technical support, including AD8331ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8331ARQ-REEL7 requirements.

6.How does Aetrix verify that AD8331ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?

All AD8331ARQ-REEL7 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 AD8331ARQ-REEL7 meets industry standards.

7.What is the process for return or replacement of AD8331ARQ-REEL7?

All AD8331ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8331ARQ-REEL7, 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 AD8331ARQ-REEL7 part is unused and in its original packaging.

Return procedure for AD8331ARQ-REEL7:

1.Submit a request within 90 days.

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

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