AD8331ARQ
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Analog Devices Inc. AD8331ARQ

Manufacturer No:
AD8331ARQ
Manufacturer:
Analog Devices Inc.
Package:
Tube
Description:
IC VGAIN AMP 20QSOP
Delivery:
Payment:
iso14001
iso45001
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iso13485

Product Introduction

Overview

The AD8331ARQ, produced by Analog Devices Inc., is a single-channel, ultralow noise, linear-in-dB variable gain amplifier (VGA). This device is optimized for ultrasound systems but can also be used as a low noise variable gain element at frequencies up to 120 MHz. The AD8331 includes an ultralow noise preamplifier (LNA), an X-AMP® VGA with a 48 dB gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA has a gain of 19 dB with a single-ended input and differential outputs, and the input impedance can be adjusted using a single resistor to match the signal source without compromising noise performance.

Key Specifications

Parameter Conditions Min Typ Max Unit
Gain Range (LO gain) -4.5 dB +43.5 dB
Gain Range (HI gain) +7.5 dB +55.5 dB
Input Voltage Noise RS = 0 Ω, HI or LO gain, RIZ = ∞, f = 5 MHz 0.82 nV/√Hz
Input Resistance RFB = ∞ 6 kΩ
Input Capacitance 13 pF
Output Impedance (Single-Ended) 50 Ω
-3 dB Small Signal Bandwidth VOUT = 0.2 V p-p 120 MHz
-3 dB Large Signal Bandwidth VOUT = 2 V p-p 110 MHz
Slew Rate (LO gain) 300 V/µs
Slew Rate (HI gain) 1200 V/µs
Power Consumption 125 mW/channel
Operating Temperature Range -40°C +85°C

Key Features

  • Ultralow noise preamplifier (LNA) with 19 dB gain and single-ended input to differential output.
  • X-AMP® VGA with 48 dB of gain range.
  • Selectable gain postamplifier with adjustable output limiting.
  • Active input impedance matching to optimize noise performance.
  • Low output-referred noise: 48 nV/√Hz typical.
  • Optimized for 10-bit/12-bit ADCs.
  • Single 5 V supply operation.
  • Available in a 20-lead QSOP package.
  • Excellent bandwidth uniformity across the entire gain range.
  • Precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V.
  • Factory trim ensures excellent part-to-part and channel-to-channel gain matching.

Applications

  • Ultrasound and sonar time-gain controls.
  • High performance automatic gain control (AGC) systems.
  • I/Q signal processing.
  • High speed, dual ADC drivers.

Q & A

  1. What is the gain range of the AD8331 in LO and HI gain modes?

    The gain range is -4.5 dB to +43.5 dB in LO gain mode and +7.5 dB to +55.5 dB in HI gain mode.

  2. What is the typical output-referred noise of the AD8331?

    The typical output-referred noise is 48 nV/√Hz.

  3. What is the bandwidth of the AD8331?

    The -3 dB small signal bandwidth is 120 MHz, and the -3 dB large signal bandwidth is 110 MHz.

  4. How is the input impedance of the AD8331 adjusted?

    The input impedance can be adjusted using a single resistor to match the signal source without compromising noise performance.

  5. What is the power consumption of the AD8331 per channel?

    The power consumption is 125 mW per channel.

  6. What are the typical slew rates for the AD8331 in LO and HI gain modes?

    The slew rates are 300 V/µs in LO gain mode and 1200 V/µs in HI gain mode.[

  7. What is the operating temperature range of the AD8331?

    The operating temperature range is -40°C to +85°C.

  8. What package types are available for the AD8331?

    The AD8331 is available in a 20-lead QSOP package.[

  9. What are some of the key applications of the AD8331?

    Key applications include ultrasound and sonar time-gain controls, high performance AGC systems, I/Q signal processing, and high speed dual ADC drivers.[

  10. How does the AD8331 optimize noise performance?

    The AD8331 optimizes noise performance through active input impedance matching.[

Product Attributes

Type:Variable Gain Amplifier
Applications:Signal Processing
Mounting Type:Surface Mount
Package / Case:20-SSOP (0.154", 3.90mm Width)
Supplier Device Package:20-QSOP
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Similar Products

Part Number AD8331ARQ AD8331ARQZ
Manufacturer Analog Devices Inc. Analog Devices Inc.
Product Status Obsolete Active
Type Variable Gain Amplifier Variable Gain Amplifier
Applications Signal Processing Signal Processing
Mounting Type Surface Mount Surface Mount
Package / Case 20-SSOP (0.154", 3.90mm Width) 20-SSOP (0.154", 3.90mm Width)
Supplier Device Package 20-QSOP 20-QSOP

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