AD8330

Features:

Fully Differential Signal Path
May also be Used with Single-Sided Signals Inputs from 0.3 mV to 1 V rms, Rail-Rail Outputs Differential RIN = 1 k
; ROUT (Each Output) 75
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 0.03 to 10 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* 3 LFCSP Package





Pinout






Specifications



Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....................... . . . . 6 V
Power DissipationRQ Package2. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 0.62 W
CP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................... . . . 1.67 W
Input Voltage at Any Pin . . . . . . . . . . . . . ........................ . . . . . VS + 200 mV
Storage Temperature . . . . . . . . . . . . . . . . . ................ . .65C to +105C
Operating Temperature Range . . . . . . . . . . . ................... 40C to +85C
Lead Temperature (Soldering 60 sec) . . . . . . . . . ...................... . . . . 300C




Description

The AD8330¹ 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

The AD8330 is a wideband variable-gain amplifier for use in applications requiring a fully differential signal path, low noise, welldefined gain, andmoderately low distortion, from dc to 150 MHz.The input pins can also be driven from a single ended source. The peak differential input is ±2V, allowing sinewave op-eration at 1V rms with generous headroom. The output pins can optionally drive single-sided loads and each swing essentially rail-to-rail.The diff-erential output resistance is 150 Ω. The output swing is a linear function of the voltage applied to the VMAG pin, which internally defaults to 0.5 V, to provide a peak output of ±2 V.This may 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 will decrease over the same range, with opposite slope. A second gain control port is provided at pin VMAG 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 repositioned 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, 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, not only over the basic 50 dB linear-in-dB