The AD600/AD602¹ dual channel, low noise, variable gain amplifiers are optimized for use in ultrasound imaging systems, but are applicable to any application requiring very precise gain, low noise and distortion, and wide bandwidth. Each independent channel provides a gain of 0 dB to +40 dB in the AD600 and -10 dB to +30 dB in the AD602. The lower gain of the AD602 results in an improved signal-to-noise ratio (SNR) at the output. However, both products have the same 1.4 nV/√Hz input noise spectral density. The decibel gain is directly proportional to the control voltage, accurately calibrated, and supply and temperature-stable.

To achieve the difficult performance objectives, a proprietary circuit form, the X-AMP®, was developed. Each channel of the X-AMP comprises a variable attenuator of 0 dB to -42.14 dB followed by a high speed fixed gain amplifier. In this way, the amplifier never has to cope with large inputs, and can benefit from the use of negative feedback to precisely define the gain and dynamics. The attenuator is realized as a 7-stage R-2R ladder network having an input resistance of 100 W, laser trimmed to ±2%. The attenuation between tap points is 6.02 dB; the gain-control circuit provides continuous interpolation between these taps. The resulting control function is linear in dB.

The gain-control interfaces are fully differential, providing an input resistance of ~15 M W and a scale factor of 32 dB/V (that is, 31.25 mV/dB) defined by an internal voltage reference. The response time of this interface is less than 1 µs. Each channel also has an independent gating facility that optionally blocks signal transmission and sets the dc output level to within a few millivolts of the output ground. The gating control input is TTL- and CMOS-compatible.

The maximum gain of the AD600 is 41.07 dB, and the maximum gain of the AD602 is 31.07 dB; the -3 dB bandwidth of both models is nominally 35 MHz, essentially independent of the gain. The SNR for a 1 V rms output and a 1 MHz noise bandwidth is typically 76 dB for the AD600 and 86 dB for the AD602. The amplitude response is flat within ±0.5 dB from 100 kHz to 10 MHz; over this frequency range, the group delay varies by less than ±2 ns at all gain settings.

Each amplifier channel can drive 100 W load impedances with low distortion. For example, the peak specified output is ±2.5 V minimum into a 500 W load, or ±1 V into a 100 W load. For a 200 W load in shunt with 5 pF, the total harmonic distortion for a ±1 V sinusoidal output at 10 MHz is typically -60 dBc.

The AD600J/AD602J are specified for operation from 0°C to 70°C and are available in 16-lead PDIP (N) and 16-lead SOIC_W packages. The AD600A/AD602A are specified for operation from -40°C to +85°C and are available in 16-lead CERDIP (Q) and 16-lead SOIC_W packages. The AD600S/AD602S are specified for operation from -55°C to +125°C, are available in a 16-lead CERDIP (Q) package, and are MIL-STD-883 compliant. The AD600S/AD602S are also available under DESC SMD 5962-94572.

AD600 - Gain Range: 0 dB to 40 dB

AD602 - Gain Range: -10 dB to + 30 dB

¹Patented.

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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