The AD603ARZ-REEL7 from Analog Devices is a low-noise 90MHz variable gain amplifier (VGA) with 0dB to +40dB gain range, programmable via a differential control voltage, in an 8-SOIC package.<\/p>\n
| \u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/td>\n | Low-Noise Variable Gain Amplifier (VGA)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Bandwidth<\/td>\n | 90 MHz (at all gain settings)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Gain Range<\/td>\n | 0 dB to +40 dB (AD603A version)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Gain Scaling<\/td>\n | 25 mV\/dB (40 dB\/V)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Gain Accuracy<\/td>\n | +\/-0.5 dB (typ)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Input Noise<\/td>\n | 1.3 nV\/rtHz (referred to input at max gain)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n | +\/-4.75V to +\/-5.25V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Supply Current<\/td>\n | 17 mA (typ per amplifier)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| Output Swing<\/td>\n | +\/-3.0V (min, RL=500 Ohm)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | 8-SOIC<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||
| \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n | -40 to +85 C<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The AD603ARZ-REEL7 from Analog Devices is a low-noise 90MHz variable gain amplifier (VGA) with 0dB to +40dB gain range, programmable via a differential control voltage, in an 8-SOIC package. Key Specifications Function Low-Noise Variable Gain Amplifier (VGA) Bandwidth 90 MHz (at all gain settings) Gain Range 0 dB to +40 dB (AD603A version) […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[165],"class_list":["post-3791","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"90MHz VGA, 0-40dB gain, 25mV\/dB control, 1.3nV\/rtHz noise, SOIC-8","date_code":"","package_case":"8-SOIC (4.9 x 3.9 x 1.75 mm, R package)","in_stock":1915,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/AD603.pdf","price":"$5.20 @ 1ku","product_introduction":"The AD603ARZ-REEL7 from Analog Devices is a low-noise, voltage-controlled variable gain amplifier (VGA) optimized for applications requiring precise gain control over a wide frequency range. The device provides a gain range of 0dB to +40dB (AD603A version) with a linear-in-dB response controlled by a differential voltage on the GNEG and GPOS pins. The gain scaling factor is 25mV\/dB (equivalently, 40dB per volt of control voltage), enabling precise gain programming from a DAC or other voltage source. A key feature of the AD603 is its constant 90MHz bandwidth across the entire gain range, unlike traditional VGA circuits where bandwidth varies with gain. This is achieved through ADI's proprietary X-AMP (eXponential AMPlifier) architecture, which uses a fixed-gain amplifier preceded by a variable attenuator based on a patented interpolating DAC. The ultra-low 1.3nV\/rtHz input-referred noise at maximum gain makes the AD603 suitable for receiving weak signals in ultrasound, radar, and communications systems. The gain accuracy of +\/-0.5dB (typical) ensures repeatable performance across devices and temperature. The differential gain control interface provides 30dB of common-mode rejection on the control lines, rejecting noise and offset. Two AD603 devices can be cascaded in series (output of one feeding the input of the next) to achieve 0-80dB gain range, or in parallel for improved noise performance.","working_principle":"The AD603ARZ-REEL7 operates using ADI's proprietary X-AMP architecture. Key subsystems include: (1) X-AMP Architecture - the signal path consists of a passive 42dB R-2R ladder attenuator followed by a fixed-gain amplifier; the attenuator has multiple tap points; an interpolating circuit smoothly transitions between adjacent taps, controlled by the differential voltage on GPOS\/GNEG; this provides continuous gain adjustment with a linear-in-dB response; (2) Gain Control - the gain is determined by the differential voltage VCTL = VGPOS - VGNEG; the gain in dB = 40 x VCTL + gain_offset; for the AD603A, the gain range is 0-40dB corresponding to VCTL of 0V to 1V; the 25mV\/dB scaling means that a 1V change in control voltage produces a 40dB gain change; (3) Constant Bandwidth - because the variable attenuation occurs before the fixed-gain amplifier, the bandwidth is determined solely by the fixed-gain amplifier characteristics; the attenuator is purely resistive and has no bandwidth limitation; this results in a constant 90MHz -3dB bandwidth regardless of the gain setting; (4) Low Noise - the input-referred noise voltage density of 1.3nV\/rtHz at maximum gain is set by the thermal noise of the attenuator ladder resistance at the lowest attenuation setting; as gain decreases, the attenuator increases the source resistance seen by the amplifier, increasing the input-referred noise; (5) Cascading - two AD603 devices can be cascaded by connecting the output of the first stage to the input of the second; in this configuration, the gain ranges add (0+0=0dB minimum, 40+40=80dB maximum), and the total gain control range is 80dB.","pin_description":"
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