ADA4859-3ACPZ-RL

Overview

The ADA4859-3ACPZ-RL is a triple, single-supply, fixed gain of two high-speed video amplifier with an integrated charge pump. It operates on supply voltages from 3 V to 5.5 V and eliminates the need for negative supplies by generating a negative rail internally. The device features a large signal bandwidth of 195 MHz at 2 V p-p output and a slew rate of 740 V/µs. Total quiescent current is 38 mA, including the charge pump. It includes a power-down feature reducing current to as low as 2 mA. The input common-mode range extends from −1.8 V to +3.8 V at a 5 V supply. It is housed in a 16-lead LFCSP package.

Feature Summary

• Integrated charge pump generates negative supply voltage for single-supply operation
• Fixed internal gain of two with on-chip feedback resistors
• Power-down pin reduces total supply current significantly when inactive
• High input common-mode voltage range extending below ground potential

Applications

• Professional video applications
• Consumer video applications
• Imaging systems
• Active filters

Procurement Notes

Verify the specific ordering suffix (R7) corresponds to the required reel quantity of 1,500 units. Confirm RoHS compliance status via the manufacturer's documentation. Ensure PCB layout adheres to high-speed design guidelines, particularly regarding ground plane integrity and bypass capacitor placement near power pins. Check humidity sensitivity handling requirements during storage and assembly.

Selection Notes

Select this component when a triple amplifier configuration is required with a fixed gain of two. It is suitable for designs needing single-supply operation without external negative voltage generation. Consider the 195 MHz bandwidth and 740 V/µs slew rate for high-frequency video signals. Evaluate the power-down functionality if system power management requires reduced standby current consumption.

Part Context

This part belongs to the ADA4859-3 series of high-speed video amplifiers manufactured by Analog Devices Inc. It is designed specifically for SD and HD video applications where space savings and simplified circuitry are priorities. The integration of the charge pump and fixed gain resistors distinguishes it from general-purpose operational amplifiers requiring external components for similar functionality.

Replacement Considerations

ADA4859-3ACPZ-R2

FAQ

How does the charge pump function when the amplifier is powered down?

The charge pump remains active even when the power-down pin is enabled. It continues to provide the generated negative voltage and can supply current for external use, although the current capacity is limited depending on the supply voltage.

Can the ADA4859-3 be configured for unity gain?

Yes, although the internal gain is fixed at +2, the datasheet provides configurations for unity gain (+1) and inverting unity gain (-1) by utilizing specific external resistor connections or tying inputs together.