AD8332 Dual VGA with Ultralow Noise Preamplifier and Programmable RIN

The AD8332 is a dual channel ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz.

Included in each channel are an ultralow noise preamplifier (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamplifier 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 operating temperature range is -40°C to +85°C. The AD8332 is available in a 28-lead TSSOP and 32-lead LFCSP packages.

The AD8332 is a dual version of the single AD8331 and quad AD8334.

Applications

Features and Benefits

Ultralow noise preamplifier (preamp)

Voltage noise = 0.74 nV/√Hz
Current 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 mode
7.5 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

Amplifiers

Data Sheets

Document	note
AD8331/AD8332/AD8334: Ultralow Noise VGAs with Preamplifier and Programmable RIN Data Sheet (Rev. I)	PDF 1.91 M

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8332ACPZ-R2 Production	32 ld LFCSP (5x5mm) w/3.1mm exposed pad	REEL 250	-40 to 85C	14.58	14.58	Y
AD8332ACPZ-R7 Production	32 ld LFCSP (5x5mm) w/3.1mm exposed pad	REEL 1500	-40 to 85C	12.68	10.78	Y
AD8332ACPZ-RL Production	32 ld LFCSP (5x5mm) w/3.1mm exposed pad	REEL 5000	-40 to 85C	12.68	10.78	Y
AD8332ARU Last Time Buy	28 ld TSSOP (4.4mm)	OTH 50	-40 to 85C	14.32	12.18	N
AD8332ARU-REEL7 Last Time Buy	28 ld TSSOP (4.4mm)	REEL 1000	-40 to 85C	14.32	12.18	N
AD8332ARUZ Production	28 ld TSSOP (4.4mm)	OTH 50	-40 to 85C	12.68	10.78	Y
AD8332ARUZ-R7 Production	28 ld TSSOP (4.4mm)	REEL 1000	-40 to 85C	12.68	10.78	Y
AD8332ARUZ-RL Production	28 ld TSSOP (4.4mm)	REEL 2500	-40 to 85C	12.68	10.78	Y