Datasheet AD8331-EP (Analog Devices)

Ultralow Noise VGA with Preamplifier and Programmable R IN Enhanced Product AD8331-EP FEATURES FUNCTIONAL BLOCK DIAGRAM Ultralow noise preamplifier (preamp) LON LOP VIP VIN VCM HILO Input voltage noise: 0.74 nV/√Hz typical V 3.5dB OR 15.5dB MID Input current noise: 2.5 pA/√Hz typical LNA – VOH −3 dB small signal bandwidth: 120 MHz typical 48dB INH 19dB 21dB PA ATTENUATOR Low power dissipation: 125 mW typical + VOL Wide gain range with programmable postamp LMD CLAMP −4.5 dB to +43.5 dB in low gain mode VCM GAIN BIAS VGA BIAS AND CONTROL RCLMP INTERPOLATOR INTERFACE 7.5 dB to 55.5 dB in high gain mode Low output-referred noise: 48 nV/√Hz typical AD8331-EP
001
Active input impedance matching ENBx GAIN
20775-
Optimized for 10-bit/12-bit ADCs
Figure 1.
Selectable output clamping level Single 5 V supply operation ENHANCED PRODUCT FEATURES Supports defense and aerospace applications (AQEC standard) Extended industrial temperature range: −55°C to +105°C Controlled manufacturing baseline 1 assembly/test site 1 fabrication site Product change notification
The 48 dB gain range of the VGA makes this device suitable for
Qualification data available on request
a variety of applications. Excel ent bandwidth uniformity is
APPLICATIONS
maintained across the entire range. The gain control interface provides precise linear in dB scaling of 50 dB/V for control
Radars
voltages between 100 mV and 0.95 V. Factory trim ensures
Ultrasound and sonar time-gain controls
excellent part to part gain matching.
High performance automatic gain control (AGC) systems In-phase quadrature (I/Q) signal processing
Differential signal paths result in superb second- and third-
High speed ADC drivers
order distortion performance and low crosstalk.
GENERAL DESCRIPTION
The low output referred noise of the VGA is advantageous in driving high speed differential analog-to-digital converters The AD8331-EP is a single-channel, ultralow noise, linear in dB, (ADCs). The gain of the post amplifier (PA) can be pin selected variable gain amplifier (VGA). Optimized for ultrasound to 3.5 dB or 15.5 dB to optimize gain range and output noise for systems, the device is usable as a low noise variable gain element 12-bit or 10-bit converter applications. The output can be limited to at frequencies up to 120 MHz. a user selected clamping level, preventing input overload to a Included in the channel are an ultralow noise preamp (LNA), an subsequent ADC. An external resistor adjusts the clamping level. X-AMP® VGA with 48 dB of gain range, and a selectable gain The operating temperature is specified across the −55°C to postamp with adjustable output limiting. The LNA gain is 19 dB +105°C extended industrial range. with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a Additional application and technical information can be found signal source without compromising noise performance. in the AD8331 data sheet.
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Document Outline FEATURES ENHANCED PRODUCT FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS POWER DERATING CURVES THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS OUTLINE DIMENSIONS ORDERING GUIDE