AD8432 Analog Devices, AD8432 Datasheet - Page 25

• Manufacturer Part Number: AD8432
• Description: Dual-Channel Ultralow Noise Amplifier with Selectable Gain and Input Impedance
• Manufacturer: Analog Devices

Specifications of AD8432

• Vcc-vee: 4.5V to 5.5V
• Isy Per Amplifier: 12mA
• Packages: CSP
• -3db Bandwidth: 200MHz
• Slew Rate: 170V/µs
• Vos: 1mV
• Ib: n/a
• # Opamps Per Pkg: 2
• Input Noise (nv/rthz): 0.8nV/rtHz

EVALUATION BOARD
Figure 73 shows the AD8432 evaluation board, and the schematic
diagram is shown in Figure 74. Using the board is a convenient
and fast way to verify system design and assess the performance of
the AD8432 under user-specific operating conditions. The
board provides access to all LNA inputs, outputs, and gain setting
pins. The board is shipped in a typical G = 12.04 dB configuration
but is designed to allow customization of the setup as required.
The AD8432-EVALZ requires a single 5 V power supply. An
on-board switch (S1) allows VPS to drive the enable (ENB) input.
GAIN SETTING
Headers (W5 to W12) are provided across the gain setting pins
and can be shorted using jumpers to allow gain setting quickly
and easily. Alternately, it is recommended to short the gain setting
pins using surface-mount (0402), 0 Ω resistors (R1 to R4, R9 to
R12) that eliminate the small parasitic capacitances from longer
trace lengths to the headers. As shipped, the evaluation board is
configured for G = 12.04 dB with these 0 Ω resistors.
Figure 73. Evaluation Board
Rev. B | Page 25 of 28
Table 8 outlines the resistors or headers that must be installed or
shorted for each gain configuration.
Table 8. Gain Setting Using Resistors or Headers
R1
R2
R3
R4
1
X = shorting the indicated header or resistor.
LNA1
W5
W6
W7
W8
R9
R10
R11
R12
LNA2
W9
W10
W11
W12
4
X
X
X
X
1
1
1
1
8
X
X
Gain (V/V)
1
1
12
X
X
AD8432
1
1
16