Analog Devices AD8335ACPZ-REEL7

SP Amp Variable Gain Amp Quad 5.5V 64-Pin LFCSP EP T/R

Special Purpose Amplifiers Quad Low Noise Variable Gain

QUAD LOW NOISE, LOW COST VARIABL

The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range of 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel. The preamplifier (PrA) has a single-ended to differential gain of ×8 (18.06 dB) and accepts input signals <625 mV p-p. PrA noise is 1.2 nV/vHz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/vHz at maximum gain. Assuming a 20 MHz noise bandwidth (NBW), the Nyquist frequency for a 40 MHz ADC, the input SNR is 92 dB. The HLxx pin optimizes the output SNR for 10-bit and 12-bit ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs. Channel 1 and Channel 2 are enabled through the EN12 pin and Channel 3 and Channel 4 are enabled through the EN34 pin. For VGA only applications, the PrAs can be powered down, significantly reducing power consumption. The AD8335 is available in a 64-lead lead frame chip scale package (9 mm × 9 mm) for the industrial temperature range of -40°C to +85°C. Applications Medical imaging (ultrasound, gamma cameras) Sonar Test and measurement Precise, stable wideband gain control Data Sheet, Rev A, 08/2008