
AD8370
Rev. 0 | Page 22 of 28
Figure 58. Evaluation Software
Table 7. AD8370 Evaluation Board Configuration Options
Component
Function
VS, GND,
VOCM
allows external monitoring of the common-mode input and output bias levels.
SW1, R8, C10,
PWUP
pin is connected to the PWUP vector pin. The PWUP pin allows external power cycling
of the device. R8 and C10 are provided to allow for proper cable termination.
P1, R5, R6, R7,
C9
Windows based control software is shipped with the evaluation kit. A 25-pin D-sub
connector cable is required to connect the PC to the evaluation board. It may be
necessary to use a capacitor on the clock line, depending on the quality of the PC port
signals. A 1 nF capacitor for C9 is usually sufficient for reducing clock overshoot.
J1, J2, J6, J7
Input and Output Signal Connectors. These SMA connectors provide a convenient way
to interface the evaluation board with 50 test equipment. Typically the device is
evaluated using a single-ended source and load. The source should connect to J1 (IN+),
and the load should connect to J6 (OUT+).
C1, C2, C3, C4
AC Coupling Capacitors. Provide ac coupling of the input and output signals.
T1, T2
Impedance Transformers.
T1 provides a 50 to 200 impedance transformation. T2
provides a 100 to 50 impedance transformation.
R1, R2, R3, R4
Single-Ended or Differential. R2 and R4 are used to ground the center tap of the
secondary windings on transformers T1 and T2. R1 and R3 should be used to ground J2
and J7 when used in single ended applications.
C5, C6, C7, C8
L1, L2
inductor followed by a 1 μF capacitor to ground followed by a 0.1 μF capacitor to
ground positioned as close to the device as possible. C7 provides additional decoupling
of the input common-mode voltage. L1 provides high frequency isolation between the
input and output power supply. L2 provides high frequency isolation between the
analog and digital ground.
Default Condition
Not applicable
Power Interface Vector Pins. Apply supply voltage between VS and GND. The VOCM pin
Device Enable. Set to position B to power up the device. When in position A, the PWUP
SW1 = installed
R8 = 49.9 (Size 0805)
C10 = open (Size 0805)
P1 = installed
R5, R6, R7 = 1 k (Size 0603)
C9 = open (Size 0603)
Serial Control Interface. The evaluation board can be controlled using most PCs.
Not applicable
C1, C2, C3, C4 = 1 nF (Size 0603)
T1 = TC4 1W (MiniCircuits)
T2 = JTX210T (MiniCircuits)
R1, R2, R3, R4 = 0 (Size 0603)
Power Supply Decoupling. Nominal supply decoupling consists of a ferrite bead series
C6 = 1 μF (Size 0805)
C5, C7, C8 = 0.1 μF (Size 0603)
L1, L2 = HZ1206E601R-00
(Steward, Size 1206)