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AD8330:  Low Cost DC to 150 MHz Variable Gain Amplifier

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Статус продукта:Производство

The AD8330 is a wideband variable gain amplifier for applications requiring a fully differential signal path, low noise, well-defined gain, and moderately low distortion, from dc to 150 MHz. The input pins can also be driven from a single-ended source. The peak differential input is ±2 V, allowing sine wave operation at 1 V rms with generous headroom. The output pins can drive single-sided loads essentially rail-to-rail. The differential output resistance is 150 Ω. The output swing is a linear function of the voltage applied to the VMAG pin that internally defaults to 0.5 V, providing a peak output of ±2 V. This can be raised to 10 V p-p, limited by the supply voltage.

The basic gain function is linear-in-dB, controlled by the voltage applied to Pin VDBS. The gain ranges from 0 dB to 50 dB for control voltages between 0 V and 1.5 V—a slope of 30 mV/dB. The gain linearity is typically within ±0.1 dB. By changing the logic level on Pin MODE, the gain decreases over the same range, with an opposite slope. A second gain control port is provided at the VMAG pin and allows the user to vary the numeric gain from a factor of 0.03 to 10. All the parameters of the AD8330 have low sensitivities to temperature and supply voltages.

Using VMAG, the basic 0 dB to 50 dB range can be reposi-tioned to any value from 20 dB higher (that is, 20 dB to 70 dB) to at least 30 dB lower (that is, –30 dB to +20 dB) to suit the application, thereby providing an unprecedented gain range of over 100 dB. A unique aspect of the AD8330 is that its bandwidth and pulse response are essentially constant for all gains, over both the basic 50 dB linear-in-dB range, but also when using the linear-in-magnitude function. The exceptional stability of the HF response over the gain range is of particular value in those VGA applications where it is essential to maintain accurate gain law-conformance at high frequencies.

An external capacitor at Pin OFST sets the high-pass corner of an offset reduction loop, whose frequency can be as low as 5 Hz. When this pin is grounded, the signal path becomes dc-coupled. When used to drive an ADC, an external common-mode control voltage at Pin CNTR can be driven to within 0.5 V of either ground or VS to accommodate a wide variety of requirements. By default, the two outputs are positioned at the midpoint of the supply, VS/2. Other features, such as two levels of power-down (fully off and a hibernate mode), further extend the practical value of this excep-tionally versatile VGA.

The AD8330 is available in 16-lead LFCSP and 16-lead QSOP packages and is specified for operation from −40°C to +85°C.


  • Pre-ADC signal conditioning
  • 75 Ω cable driving adjust
  • AGC amplifiers


  • Fully differential signal path and also used with single-sided signals
  • Inputs from 0.3 mV to 1 V rms, rail-to-rail outputs
  • Differential RIN = 1 kΩ; ROUT (each output) 75 Ω
  • Automatic offset compensation (optional)
  • Linear-in-dB and linear-in-magnitude gain modes 0 dB to 50 dB, for 0 V < VDBS
    < 1.5 V (30 mV/dB)
  • Inverted gain mode: 50 dB to 0 dB at -30 mV/dB
  • x0.03 to x10 nominal gain for
    15 mV< VMAG < 5 V
  • Constant bandwidth: 150 MHz at all gains
  • Low noise: 5 nV/√Hz typical at maximum gain
  • Low distortion: ≤-62 dBc typ
  • Low power: 20 mA typ at VS of 2.7 V - 6 V
  • Available in space-saving 3 mm x 3 mm LFCSP package

Functional Block Diagram for AD8330


Наименование Тип контента Тип файлов
AD8330: Low Cost DC-150 MHz Variable Gain Amplifier Data Sheet (Rev G, 05/2014) (pdf, 1461 kB) Технические описания PDF
Design and Operation of Automatic Gain Control Loops for Receivers in Modern Communication Systems  (pdf, 129 kB) Обучение PDF
UG-130: Differential Amplifier Evaluation Board for 8-lead SOIC and MSOP Packages  (pdf, 493 kB) Руководства пользователей PDF
Variable Gain Amplifier Selection Table  (pdf, 68 kB) Product Selection Guide PDF
ADT7301: Accurate, SPI-Compatible Temperature Sensor in SOT Package  (htm)
(analogZone September 1, 2003)
Обзоры продукции HTM
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Обзор PDF
Leading Inside Advertorials: Solving Dynamic Range Problems in Analog Systems  (pdf, 75 kB) Обзор PDF
RAQs index Rarely Asked Questions HTML
What are Variable Gain Amplifiers (VGA's) and how are they used? FAQs/RAQs HTML
Словарь терминов Глоссарий HTML

Средства разработки, программные модели, драйверы и ПО

Наименование Тип контента Тип файлов
AD8330 SPICE Macro Model Модели SPICE HTML

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Приведенные цены действительны в США и указаны только для примерного бюджетного рассчета. Цены указаны в долларах США (за штуку в указанном размере партии) и могут быть изменены. Цены в других регионах могут отличаться в зависимости от местных пошлин, налогов, сборов и курсов валют. Для уточнения стоимости обращайтесь в местные офисы продаж Analog Devices, или к официальным дистрибьюторам. Цены на оценочные платы и наборы указаны за штуку независимо от количества.

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AD8330-EVALZ Статус: Контакты Evaluation Board $ 100,61 Да -

Цены указаны за одну штуку, в долларах США, на условиях ФОБ. Являются рекомендованными розничными ценами в США, приведены только для примерного расчета и могут меняться. Международные цены могут отличаться на величину местных пошлин, налогов, сборов и курсов валют.

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