+Vcc2
TP3
C2
2.2 F
L2
L1
L3
L4
1000 ohm
C1
2.2 F
C11
0.022 F
1000 ohm
GND
TP1
TP2
C4
0.22 F
-VCC
+VCC
P 3
P 2
P 1
C3
0.22 F
C6
0.01 F
C5
0.01 F
-Vcc1
+Vcc1
C12
0.022 F
GND
C7
0.22 F
C8
0.22 F
C9
0.01 F
C10
0.01 F
-Vcc2
1000 ohm
1000 ohm
Design Considerations
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SBOU161A – February 2016 – Revised April 2016
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Copyright © 2016, Texas Instruments Incorporated
THS3215EVM and THS3217EVM
2
Design Considerations
This section discusses general design considerations and options when setting up and configuring the
various blocks in THS321xEVM.
2.1
Power Supplies
Power is applied to the board through connectors P1, P2, and P3, as shown in
Figure 1
. Both bipolar and
single-sided supplies can be used. The typical supplies are ±6 V.
CAUTION
Supplies beyond ±8.1 V can damage the device.
Figure 1. THS321x Power-Supply Schematic
2.2
Digital Logic Control
There are two bidirectional switches on the THS321xEVM that control the status of the PATHSEL and
DISABLE control pins.
Figure 2
shows the control logic with respect to the switch position. For brevity, the
PATHSEL control is shown as CS and the DISABLE control is shown as PD on the PCB. The full switch
settings are listed in
Table 1
.
Figure 2. Logic Control Switches
Table 1. Bidirectional Switch Settings
Switch
Set to +VCC
Set to GND
CS_SW (PATHSEL control)
OPS external, noninverting path
Internal path from D2S to OPS
PD_SW (DISABLE control)
OPS off
OPS on
