AD8335 Quad Low Noise, Low Cost Variable Gain Amplifier _ BDTIC a Leading Distributor in China

AD8335 Quad Low Noise, Low Cost Variable Gain Amplifier

Medical imaging (ultrasound, gamma cameras) Sonar Test and measurement Precise, stable wideband gain control

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/√Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/√Hz 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.

Data Sheet, Rev A, 08/2008

Features and Benefits

Low noise preamplifier (PrA)

Voltage noise = 1.3 nV/√Hz typical

Current noise = 2.4 pA/√Hz typical

NF = 7 dB (RS = RIN = 50 Ω)

Single-ended input; VIN maximum = 625 mV p-p

Active input match

Input SNR (noise bandwidth = 20 MHz) = 92 dB

VGA
Differential output
VOUT maximum = 5 V p-p, R_L = 500 Ω differential
Gain range (8 dB output gain step)
−10 dB to +38 dB—low gain mode
−2 dB to +46 dB—high gain mode
Accurate linear-in-dB gain control

For additional features please see data sheet

Data Sheets

Document	note
AD8335: Quad Low Noise, Low Cost Variable Gain Amplifier Data Sheet (Rev. B)	PDF 702 kB

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8335ACPZ Production	64 ld LFCSP (9x9mm, 4.70mm exposed pad)	OTH 260	-40 to 85C	14.25	12.14	Y
AD8335ACPZ-REEL Production	64 ld LFCSP (9x9mm, 4.70mm exposed pad)	REEL 2500	-40 to 85C	0	12.14	Y
AD8335ACPZ-REEL7 Production	64 ld LFCSP (9x9mm, 4.70mm exposed pad)	REEL 750	-40 to 85C	14.25	12.14	Y