ADL5565 AD [Analog Devices], ADL5565 Datasheet - Page 16

• Manufacturer Part Number: ADL5565
• Description: 6 GHz Ultrahigh Dynamic Range Differential Amplifier
• Manufacturer: AD [Analog Devices]

ADL5565
CIRCUIT DESCRIPTION
BASIC STRUCTURE
The
driver that can operate from 2.8 V to 5.2 V. It provides three
gain options, 6 dB, 12 dB, and 15.5 dB, without the need for
external resistors and has wide bandwidths of greater than 6
GHz for all gains. Differential input impedance is 200 Ω for 6
dB, 100 Ω for 12 dB, and 67 Ω for 15.5 dB. It has a differential
output impedance of 10 Ω.
The
on-chip feedback and feed forward resistors. The two feedforward
resistors on each input set this pin-strappable amplifier in three
different gain configurations of 6 dB, 12 dB, and 15.5 dB, and by
using two external resistors, any gain from 0 dB to 15.5 dB can be
realized. The amplifier is designed to provide high differential
open-loop gain and an output common-mode circuit that enables
ADL5565
ADL5565
1
1
/
/
2
2
AC
R
R
S
S
0.1µF
0.1µF
is composed of a fully differential amplifier with
is a low noise, fully differential amplifier/ADC
VIP2
VIP1
VIN1
VIN2
Figure 30. Basic Structure
100Ω
100Ω
50Ω
50Ω
200Ω
200Ω
5Ω
5Ω
R
L
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the user to change the common-mode voltage from the VCOM
pin. The amplifier is designed to provide superior low distortion at
frequencies up to and beyond 300 MHz with low noise and low
power consumption from a 3.3 V power supply at 70 mA.
The
ac-coupled or dc-coupled at the inputs and/or the outputs within
the specified input and output common-mode levels. The input
of the device can be configured as single-ended or differential
with similar third-order distortion performance. Due to the
internal connections between the inputs and outputs, an output
common-mode voltage between 1.4 V and 1.8 V at 3.3 V and
1.4 V to 3 V at 5 V must be maintained for the best distortion.
For a dc-coupled input, the input common mode should be
between 1.2 V and 2 V at the 3.3 V supply, and 1.2 V to 3.8 V at
the 5 V supply. The device has been characterized using 2 V p-p
into a 200 Ω ac-coupled output. If the inputs are ac-coupled, the
input and output common-mode voltages are set by VCC/2 when
no external circuitry is used. The
common-mode voltage set by VCOM, which allows driving an
ADC directly without external components. Although distortion is
similar over the specified frequency range at both 3.3 V and 5 V,
lower distortion results on the 5 V supply for signal swings larger
than 2 V p-p.
ADL5565
is very flexible in terms of I/O coupling. It can be
ADL5565
provides an output