AD8334 Series

Quad VGA with Ultralow Noise Preamplifier and Programmable RIN

Catalog

Quad VGA with Ultralow Noise Preamplifier and Programmable RIN

Part	Supplier Device Package	Type	Applications	Package / Case	Mounting Type	Board Type	Channels per IC	Current - Supply (Main IC)	Supplied Contents	Voltage - Supply, Single/Dual (±) [Min]	Voltage - Supply, Single/Dual (±) [Max]	Output Type	Current - Output / Channel	-3db Bandwidth	Slew Rate	Utilized IC / Part
Analog Devices AD8334ACPZ-REEL	64-LFCSP-VQ (9x9)	Variable Gain Amplifier	Signal Processing	64-VFQFN Exposed Pad CSP	Surface Mount
Analog Devices AD8334-EVALZ						Fully Populated	4	29.5 mA	Board(s)	4.5 V	5.5 V	Differential	45 mA	100 MHz	650 V/µs	AD8334

Catalog

Quad VGA with Ultralow Noise Preamplifier and Programmable RIN

Key Features

• Ultralow noise preamplifier (preamp)Voltage noise = 0.74 nV/√HzCurrent noise = 2.5 pA/√Hz

• Voltage noise = 0.74 nV/√Hz

• Current noise = 2.5 pA/√Hz

• 3 dB bandwidth: 100 MHz

• Low power: 145 mW/channel

• Wide gain range with programmable postamp−4.5 dB to +43.5 dB in LO gain mode7.5 dB to 55.5 dB in HI gain mode

• −4.5 dB to +43.5 dB in LO gain mode

• 7.5 dB to 55.5 dB in HI gain mode

• Low output-referred noise: 48 nV/√Hz typical

• Active input impedance matching

• Optimized for 10-bit/12-bit ADCs

• Selectable output clamping level

• Single 5 V supply operation

• AD8332 and AD8334 available in lead frame chip scale package

Description

The AD8334 is an ultralow noise, quad channel linear-in-dB variable gain amplifier (VGA). Although optimized for ultrasound systems, it may be used as a low noise variable gain control in any application whose operating frequency is less than 100 MHz.Included in each channel are an ultralow noise preamp (LNA), an X-AMP®VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.The 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides 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. Differential signal paths result in superb second- and third-order distortion performance and low crosstalk.The AD8334 is a quad version of the single AD8331 and dual AD8332.For information on specs, see the AD8331/AD8332/AD8334 datasheet.ApplicationsUltrasound and sonar time-gain controlsHigh performance automatic gain control (AGC) systemsI/Q signal processingHigh speed, dual ADC drivers