The AD8331 is a single, ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, it is usable as a low noise variable gain element at frequencies up to 120 MHz.

Included is 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 operating temperature range is -40°C to +85°C. The AD8331 is available in a 20-lead QSOP package.

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

For information on specs, please see the AD8331/AD8332 datasheet.

Part#	Gain Control	-3 dB BW (MHz)	Gain Low End (dB)	Gain High End (dB)	Number of Channels	Spectral Noise (nV/rtHz)	Supply Voltage (V)	Supply Current (max)	Gain Accuracy (dB)	1 dB Comp Point (dBm)	Package	Price* (1000-4999)
AD600	Analog	35	0	+40	2	1.4	±5	14mA	-	-	-	$16.41
AD602	Analog	35	-10	+30	2	1.4	±5	14mA	-	-	-	$13.20
AD603	Analog	90	-11	+31	1	1.4	±5	20mA	±0.5	-	8-Lead DIP, 8-Lead SOIC	$4.35
AD604	Analog	40	0	+48	2	0.8	±5	31mA	±0.3	15	24-Lead SOIC, 24-Lead SSOP	$16.25
AD605	Analog	40	-14	+34	2	1.8	+5	23mA	±0.2	15	16-Lead SOIC	$9.79
AD8260	Digital	180	-6	+24	1	2.4	+3.3	28mA	+0.25	-	-	$3.79
AD8320	Digital	150	-10	+26	1	53	+12	105mA	±0.2	22.5	20-Lead SOIC	-
AD8321	Digital	120	-27.4	+26	1	20	+9	90mA	±1	19.5	20-Lead SOIC	$4.35
AD8322	Digital	180	-12.6	+29.5	1	64	+5	113mA	±2	19	28-Lead TSSOP	$3.15
AD8323	Digital	100	-26	+27.5	1	-	+5	-	-	-	28-Lead TSSOP	$3.30
AD8324	Digital	100	-25.5	+33.5	1	157	+3.3	207mA	±1	21	20-Lead LFCSP, 20-Lead QSOP	$1.71
AD8325	Digital	100	-29.5	+30	1	56	+5	133mA	±1	18.5	28-Lead TSSOP	$3.30
AD8326	Digital	100	-26	+27.5	1	100	±5	157mA	±1	26.5	28-Lead PSOP, 28-Lead TSSOP	$3.90
AD8327	Digital	160	-18	+30	1	64	+5	105mA	±1	18	20-Lead TSSOP	$3.75
AD8328	Digital	107	-27.5	+31.5	1	135	-	120mA	±1	18.4	20-Lead LFCSP, 20-Lead QSOP	$1.90
AD8330	Analog	150	0	+50	1	5	+6	20mA	±0.5	-	16-Lead LFCSP, 16-Lead QSOP	$4.39
AD8331	Analog	120	-4.5	+43	1	0.74	+5	25mA	+0.5	7	-	$5.39
AD8332	Analog	120	-4.5	+43.5	2	0.74	+5	58mA	+0.5	7	28-Lead TSSOP, 32-Lead CSP	$10.44
AD8334	Analog	100	+4.5	+43.5	4	0.74	+5	116mA	+0.5	7	64-Lead LFCSP	$14.49
AD8335	Analog	70	-10	+38	4	1.3	+5	76mA	±0.2	18	64-Lead LFCSP	$12.00
AD8336	Analog	115	-14	+46	1	3	±12	25mA	±0.5	11	16-Lead LFCSP	$4.59
AD8337	Analog	280	0	+24	1	2.2	±5	15mA	±0.25	-	8-Lead LFCSP	$2.49
AD8367	Analog	500	-2.5	+42.5	1	1.84	+5.5	26mA	±0.2	8.1	14-Lead TSSOP	$4.55
AD8368	Analog	800	-12	+22	1	-	+5	-	±0.4	13	24-Lead LFCSP	$4.55
AD8369	Digital	600	-5	+40	1	2	+5.5	37mA	±0.5	0.5	16-Lead TSSOP	$4.20
AD8370	Digital	700	+25	+34	1	2.1	+5.5	78mA	-	14	16-Lead TSSOP	$4.20
AD8375	Digital	690	-4	+20	1	-	+5	130mA	±0.2	19	24-Lead LFCSP	$4.49
AD8376	Digital	690	-4	+20	2	-	+5	260mA	±0.2	19	32-Lead CSP	$6.49
ADL5330	Analog	3000	-34	+22	1	-	+5	240mA	-	1.2	24-Lead LFCSP	$4.98
ADL5390	Analog	2400	-	+7	1	-	+5	130mA	-	9.6	24-Lead LFCSP	$7.50
ADL5391	Analog	2000	-	+9.5	1	26.7	+5	135mA	-	15.1	16-Lead LFCSP	$4.89

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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For detailed drawings and chemical composition please consult our  Package Site

Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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