ADL5336-EVALZ AD [Analog Devices], ADL5336-EVALZ Datasheet - Page 20

• Manufacturer Part Number: ADL5336-EVALZ
• Description: Cascadable IF VGAs
• Manufacturer: AD [Analog Devices]

ADL5336
APPLICATIONS INFORMATION
BASIC CONNECTIONS
The basic connections for a typical
shown in Figure 63.
SUPPLY DECOUPLING
A nominal supply voltage of 5.0 V should be applied to the supply
pins. The supply voltage should be between the limits of 4.5 V
and 5.5 V. All of the supply pins must be decoupled to ground
with at least one low inductance, surface-mount ceramic capacitor
of 0.1 µF. Place these decoupling capacitors as close as possible
to the
a digital supply. Take care to separate the two supplies with a
large surface-mount inductor of 33 µH, and each supply must
then be decoupled separately to their respective grounds through a
10 µF capacitor. The
analog ground and a digital ground. Again, a large surface-mount
inductor of 33 µH should be used to separate the grounds.
ADL5336
device. The
VPOS
INPUT 1
VPOS
ADL5336
ADL5336
OUTPUT 1
INPUT 1
BALUN
also has two separate grounds: an
+5V
+5V
ADL5336
has an analog supply and
OUTPUT 1
BALUN
application are
ENBL
VCM1
VPOS
INP1
INM1
COM
VPOS
MODE
Figure 63. Basic Connections Schematic
INPUT 2
Rev. B | Page 20 of 32
ADL5336
INPUT 2
BALUN
INPUT SIGNAL PATH
The
go to VGA2 via an internal switch, and the other input goes to
VGA1. Each of the three pairs of input pins (INP1/INM1,
IP2A/IM2A, and IP2B/IM2B) has a differential input impedance of
200 Ω. To obtain maximum power transfer, the driving source
impedance also needs to be 200 Ω. On the evaluation board,
this is achieved via a 4:1 impedance ratio balun. The evaluation
board schematic is shown in Figure 70. For more information
on the input signal paths, refer to the Input Signal Path section.
The input common-mode voltage sits at roughly VPOS/2 for
both VGAs, except on VGA2; the nonselected input of VGA2
has an input common-mode voltage that sits at roughly ground.
OUTPUT SIGNAL PATH
There are two output signal paths on the ADL5336; one signal
path per VGA. The output of VGA1 can be ac-coupled into either
of the inputs of VGA2, which cascades the two VGAs, or ac-coupled
into a 200 Ω termination impedance. VGA1 is designed to drive a
200 Ω differential load, whereas VGA2 is designed to drive a 100 Ω
differential load. On the evaluation board, a 100 Ω differential
impedance is presented to the output of VGA2. This is achieve
via a 1:1 balun and a resistive matching network. For more
information on the evaluation board, see the evaluation board
schematic in Figure 70. The output common-mode voltage on
both VGAs sits at roughly VPOS/2.
ADL5336
OPM2
VCM2
VPOS
VPOS
DATA
OPP2
COM
SDO
has three input signal paths, two of which inputs
INPUT 3
BALUN
OUTPUT 2
BALUN
SPI CONTROL
+5V
+5V
INPUT 3
OUTPUT 2
Data Sheet