Texas Instruments ADS1224EVM, Руководство пользователя

Страница: 23 / 34

Switches
2-9 Circuit Description
2.3 Switches
The positions and functions of the EVM switches are shown in Figure 2−6.
Figure 2−6.
Switches
CH 1 INPUT
SWITCHES
CLOCK
SELECT
CH 2 INPUT
SWITCHES
VREF INPUT
SWITCHES
S1, S2
S3, S4
S5, S6
S7
2.3.1 S1−4: Input Select Switches
These switches control which lines are routed to the ADS1224 channel 0
(AIN0) and channel 1 (AIN1) inputs. Each switch is configured in the same way
and connects to a single input pin. The positions of the switches are described
in Table 2−4.
Table 2−4. AIN0−1 Input Select Switch
Board Marking Switch Position
Input Source
EXT Left External (J1 pin)
0V Right Ground
VRP Middle Positive reference voltage
Note that VRP is controlled by switch S5.