AD8260ACPZ-R7 Dual 250MHz Low Power Op Amp 1nV/√Hz Noise ±5V to ±15V Supply LFCSP-16 -40°C to +125°C Industrial Grade

AD8260ACPZ-R7 Dual 250MHz Low Power Op Amp 1nV/andradic;Hz Noise andplusmn;5V to andplusmn;15V Supply LFCSP-16 -40anddeg;C to +125anddeg;C Industrial Grade

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FEATURES

High current driver

andnbsp; Differential inputandmdash;direct drive from DAC

andnbsp; Preset gain: 1.5andtimes;

andnbsp; andminus;3 dB bandwidth: 195 MHz

andnbsp; Large output drive: andgt;andplusmn;300 mA

VGA/preamplifier

andnbsp; Low noise

andnbsp; andnbsp; Voltage noise: 2.4 nV/andradic;Hz

andnbsp; andnbsp; Current noise: 5 pA/andradic;Hz

andnbsp; andminus;3 dB bandwidth: 230 MHzandnbsp;

andnbsp; Gain range: 30 dB in 3 dB steps

andnbsp; andnbsp; andminus;6 dB to +24 dB (for preamplifier gain of 6 dB)

andnbsp; Single-ended preamplifier input and differential VGA

andnbsp; andnbsp; output

Supplies: 3.3 V to 10 V (with VMID enabled)

andnbsp; andplusmn;3.3 V to andplusmn;5 V (with VMID disabled)

Power: 93 mW with 3.3 V supplies

andnbsp; Power-down for VGA, driver amplifier, and system

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APPLICATIONS

Digital AGC systems

Tx/Rx signal processing

Power line transceivers

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GENERAL DESCRIPTION

The AD8260 includes a high current driver, usable as a transmitter, and a low noise digitally programmable variable gain amplifier (DGA), useable as a receiver.

The receiver section consists of a single-ended input preampli fier, and linear-in-dB, differential-output DGA. The receiver has a small signal andndash;3 dB bandwidth of 230 MHz; the driver small signal bandwidth is 195 MHz. The driver delivers andplusmn;300 mA, well suited for driving low impedance loads, even when connected to a 3.3 V supply.

The AD8260 DGA is ideal for trim applications and has a gain span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is maintained across the entire frequency range. The low output referred noise of the DGA is advantageous in driving high speed ADCs. The differential output facilitates the interface to modern low voltage high speed ADCs.

Single-supply and dual-supply operation makes the part versatile and enables gain control of negative-going pulses, such as those generated by photodiodes or photo-multiplier tubes, as well as processing band-pass signals on a single supply. For maximum dynamic range, it is essential that the part be ac-coupled when operating on a single supply.

The AD8260 preamplifier (PrA) is configured with external resistors for gains greater than 6 dB and can be inverting or noninverting. The DGA is characterized with a noninverting preamplifier gain of 2andtimes;. The attenuator has a range of 30 dB and the output amplifier has a gain of 8andtimes; (18.06 dB). The lowest noninverting gain range is andminus;6 dB to +24 dB and shifts up with increased preamplifier gain. The gain is controlled via a parallel port (Pin GNS0 to Pin GNS3) with 10 gain steps of 3 dB per code. The preamplifier and DGA are disabled for any code that is not assigned a gain step.

The AD8260 can operate with single or dual supplies from 3.3 V to andplusmn;5 V. An internal buffer normally provides a split supply reference for single-supply operation; an external reference can also be used when the VMID buffer is shut down.

The operating temperature range is andminus;40anddeg;C to +105anddeg;C. The AD8260 is available in a 5 mm andtimes; 5 mm, 32-lead LFCSP.

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INFORMATION

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• Fast delivery --- we will ship the goods within 1-3 working days after the payment confirmed.

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