The AD8320 is a digitally controlled variable gain amplifier optimized for coaxial line driving applications. An 8-bit serial word determines the desired output gain over a 36 dB range (256 gain levels). The AD8320 provides linear gain response.

The AD8320 is made up of a digitally controlled variable attenuator of 0 dB to –36 dB, which is preceded by a low noise, fixed gain buffer and followed by a low distortion high power amplifier. The AD8320 has a 220 ohm input impedance and accepts a single-ended input signal with a specified analog input level of up to 0.310 V p-p. The output is specified for driving a 75 ohm load, such as coaxial cable, although the AD8320 is capable of driving other loads. Distortion performance of –57 dBc is achieved with an output level up to 12 dBm (3.1 V p-p) at 42 MHz, while –46 dBc distortion is achieved with an output level up to 18 dBm (6.2 V p-p).

A key performance and cost advantage of the AD8320 results from the ability to maintain a constant 75 ohm output impedance during power-up and power-down conditions. This eliminates the need for external 75 ohm back-termination, resulting in twice the effective output voltage when compared to a standard operational amplifier. Additionally, the on-chip 75 ohm termination results in low glitch output during power-down and power-up transitions, eliminating the need for an external switch.

The AD8320 is packaged in a 20-lead SOIC and operates from a single +5 V through +12 V supply and has an operational temperature range of –40°C to +85°C.

An evaluation board is available for this product and may be ordered using the following product number: AD8320-EB. Schematic and layout for this evaluation board is contained in the product 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	-	-	-	$16.61
AD602	Analog	35	-10	+30	2	1.4	±5	14mA	-	-	-	$13.36
AD603	Analog	90	-11	+31	1	1.4	±5	20mA	±0.5	-	8-Lead DIP, 8-Lead SOIC	$4.40
AD604	Analog	40	0	+48	2	0.8	±5	31mA	±0.3	15	24-Lead SOIC, 24-Lead SSOP	$16.45
AD605	Analog	40	-14	+34	2	1.8	+5	23mA	±0.2	15	16-Lead SOIC	$9.91
AD8260	Digital	180	-6	+24	1	2.4	+3.3	28mA	+0.25	-	-	$3.84
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	$4.40
AD8322	Digital	180	-12.6	+29.5	1	64	+5	113mA	±2	19	28-Lead TSSOP	$3.19
AD8323	Digital	100	-26	+27.5	1	-	+5	-	-	-	28-Lead TSSOP	$3.34
AD8324	Digital	100	-25.5	+33.5	1	157	+3.3	207mA	±1	21	20-Lead LFCSP, 20-Lead QSOP	$1.73
AD8325	Digital	100	-29.5	+30	1	56	+5	133mA	±1	18.5	28-Lead TSSOP	$3.34
AD8326	Digital	100	-26	+27.5	1	100	±5	157mA	±1	26.5	28-Lead PSOP, 28-Lead TSSOP	$3.95
AD8327	Digital	160	-18	+30	1	64	+5	105mA	±1	18	20-Lead TSSOP	$3.80
AD8328	Digital	107	-27.5	+31.5	1	135	-	120mA	±1	18.4	20-Lead LFCSP, 20-Lead QSOP	$1.92
AD8330	Analog	150	0	+50	1	5	+6	20mA	±0.5	-	16-Lead LFCSP, 16-Lead QSOP	$4.44
AD8331	Analog	120	-4.5	+43	1	0.74	+5	25mA	+0.5	7	-	$5.45
AD8332	Analog	120	-4.5	+43.5	2	0.74	+5	58mA	+0.5	7	28-Lead TSSOP, 32-Lead CSP	$10.57
AD8334	Analog	100	+4.5	+43.5	4	0.74	+5	116mA	+0.5	7	64-Lead LFCSP	$14.66
AD8335	Analog	70	-10	+38	4	1.3	+5	76mA	±0.2	18	64-Lead LFCSP	$12.14
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	$2.52
AD8367	Analog	500	-2.5	+42.5	1	1.84	+5.5	26mA	±0.2	8.1	14-Lead TSSOP	$4.60
AD8368	Analog	800	-12	+22	1	-	+5	-	±0.4	13	24-Lead LFCSP	$4.60
AD8369	Digital	600	-5	+40	1	2	+5.5	37mA	±0.5	0.5	16-Lead TSSOP	$4.25
AD8370	Digital	700	+25	+34	1	2.1	+5.5	78mA	-	14	16-Lead TSSOP	$4.25
AD8375	Digital	690	-4	+20	1	-	+5	130mA	±0.2	19	24-Lead LFCSP	$4.54
AD8376	Digital	690	-4	+20	2	-	+5	260mA	±0.2	19	32-Lead CSP	$6.57
ADL5330	Analog	3000	-34	+22	1	-	+5	240mA	-	1.2	24-Lead LFCSP	$5.04
ADL5390	Analog	2400	-	+7	1	-	+5	130mA	-	9.6	24-Lead LFCSP	$7.59
ADL5391	Analog	2000	-	+9.5	1	26.7	+5	135mA	-	15.1	16-Lead LFCSP	$4.95
ADL5592	Digital	2400	-	+30.5	1	-	-	-	-0.02	-	40-Lead LFCSP	-

* 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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