ANALOG DEVICES AD8260ACPZ-R7 可编程/可变增益放大器, 2 放大器, 2个放大器, 195 MHz, -40 °C, 105 °C, 3.3V 至 10V, ± 3.3V 至 ± 5V
Product Details
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 preamplifier, and linear-in-dB, differential-output DGA. The receiver has a small signal –3 dB bandwidth of 230 MHz; the driver small signal bandwidth is 195 MHz. The driver delivers ±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 2×. The attenuator has a range of 30 dB and the output amplifier has a gain of 8× 18.06 dB. The lowest noninverting gain range is −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 ±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 −40°C to +105°C. The AD8260 is available in a 5 mm × 5 mm, 32-lead LFCSP.
Applications
### Features and Benefits
Voltage noise: 2.4 nV/√Hz
Current noise: 5 pA/√Hz
−6 dB to +24 dB for preamplifier gain of 6 dB