AD8335ACPZ

Overview

The AD8335ACPZ is a quad variable gain amplifier (VGA) with integrated low noise preamplifiers, designed for cost and power-sensitive applications. It operates on a single 5 V supply, consuming 95 mW per channel when enabled. The device features fully differential signal paths and user-selectable gain ranges of −10 dB to +38 dB or −2 dB to +46 dB. Each channel provides accurate linear-in-dB gain control via the VGNx pin. The preamplifier stage offers a fixed gain of ×8 (18.06 dB) with an input voltage range up to 625 mV p-p. The component is housed in a 64-lead lead frame chip scale package measuring 9 mm by 9 mm.

Feature Summary

• Integrates low noise preamplifiers with active input matching for optimized signal integrity.
• Provides fully differential signal paths to maximize output swing and reduce even-order distortion.
• Features individual gain controls for each channel with precise linear-in-dB characteristics.
• Supports independent power-down of preamplifiers to significantly reduce total system power consumption.

Applications

• Medical imaging systems including ultrasound and gamma cameras
• Sonar signal processing circuits
• Test and measurement instrumentation
• Precise wideband gain control applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm packaging type and reel specifications. Ensure the selected variant matches the required industrial temperature range and package dimensions. Cross-reference the part number with official distributor catalogs to validate availability status and compliance certifications prior to final procurement decisions.

Selection Notes

Select this component for designs requiring multiple synchronized channels with low noise performance. Evaluate the trade-off between the integrated preamplifier noise figure and the available gain range. Consider the power consumption implications of keeping preamplifiers enabled versus disabling them for VGA-only operation. Verify that the single-ended input requirement aligns with the source impedance capabilities of the preceding circuit stage.

Part Context

This component belongs to the Analog Devices AD8335 family of variable gain amplifiers. It is specifically engineered as a quad-channel solution intended for applications demanding high channel count integration without sacrificing signal fidelity. The design focuses on providing a compact footprint and reduced bill of materials compared to discrete multi-channel implementations.

Replacement Considerations

No public confirmed substitute part numbers are documented for this component.

FAQ

How are the four channels enabled or disabled?

Channels 1 and 2 are controlled by the EN12 pin, while Channels 3 and 4 are controlled by the EN34 pin. Connecting these pins to the positive supply enables the respective channels.

What is the function of the HLxx pins?

The HLxx pins configure the VGA gain range. Applying logic low selects the low gain mode, while applying logic high selects the high gain mode, optimizing the gain distribution for different ADC resolutions.

Can the preamplifiers be powered down independently?

Yes, the preamplifiers can be shut down by connecting the SP12 and SP34 pins to the positive supply. This reduces power consumption if only the VGA functionality is required.