ADL5201-EVALZ AD [Analog Devices], ADL5201-EVALZ Datasheet - Page 18

• Manufacturer Part Number: ADL5201-EVALZ
• Description: Wide Dynamic Range, High Speed
• Manufacturer: AD [Analog Devices]

ADL5201
APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 53 shows the basic connections for operating the ADL5201.
A voltage between 4.5 V and 5.5 V should be applied to the
VPOS pins. Each supply pin should be decoupled with at least
one low inductance, surface-mount ceramic capacitor of 0.1 μF,
placed as close as possible to the device.
The outputs of the
supply with 1 μH RF chokes. The differential outputs are biased
to the positive supply and require ac coupling capacitors, preferably
0.1 μF. Similarly, the input pins are at bias voltages of about 1.6 V
above ground and should be ac-coupled, as well. The ac coupling
capacitors and the RF chokes are the principle limitations for
operation at low frequencies.
The digital pins (mode control pins, associated SPI and parallel
gain control pins, PM, and PWUP) operate on a voltage of 3.3 V.
BALANCED
SOURCE
GAIN MODE INTERFACE
ADL5201
AC
R
R
2
2
S
S
must be pulled up to the positive
MODE0
0.1µF
0.1µF
1
2
3
4
5
6
0.1µF
24
7
0.1µF
GAIN CONTROL INTERFACE
23
8
0.1µF
Figure 53. Basic Connections
ADL5201
Rev. 0 | Page 18 of 28
22
9
0.1µF
21
10
3.3V
20
11
To enable the ADL5201, the PWUP pin must be pulled high
(1.4 V ≤ PWUP ≤ 3.3 V). Taking PWUP low puts the
in sleep mode, reducing current consumption to approximately
7 mA at ambient temperature.
ADC DRIVING
The
is optimized for ADC interfacing. The output IMDs and noise
floor remain constant throughout the 31.5 dB gain range. This
is a valuable feature in a variable gain receiver, where it is
desirable to maintain a constant instantaneous dynamic range
as the receiver range is modified. The output noise is 15 nV/√Hz,
which is compatible with 14- or 16-bit ADCs. The two-tone
IMDs are usually greater than −100 dB for −1 dBm into 150 Ω
or 2 V p-p output. The 150 Ω output impedance makes the task
of designing a filter for the high input impedance ADCs more
straightforward.
3.3V
19
12
ADL5201
18
17
16
15
14
13
0.1µF
is a highly linear, variable gain amplifier that
1µH
1µH
0.1µF
0.1µF
R
+V
L
POS
10µF
BALANCED
LOAD
Data Sheet
ADL5201