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DDC112
(DUT)
1
2
3
4
5
6
IN1
AGND
CAP1B
CAP1B
CAP1A
CAP1A
IN2
AGND
CAP2B
CAP2B
CAP2A
CAP2A
28
27
26
25
24
23
P
16
C
11
C
10
P
15
P
13
P
14
P
19
C
13
C
12
P
20
P
18
P
17
DDC114
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External capacitors can be inserted in the C10, C11, C12, and C13 positions, as shown in Figure 6. These
external capacitors can be used to set the gain of the DDC112U (DUT) to user specifications instead of
the seven internal gains available. Refer to the DDC112 portion of this user guide for more details
concerning the appropriate value of these external capacitors. For further detailed information, also refer
to the DDC112 product data sheet. For best performance, the leads of the capacitors should be as short
as possible on C10 to C11 and C12 to C13.
Figure 6. External Gain Capacitor Socket Configuration for the DUT Board
4 DDC114
The DDC114 is a 20-bit, quad channel, current-input A/D converter (as shown in Figure 7). It combines
both current-to-voltage and A/D conversion so that four low-level current output devices, such as
photodiodes, can be directly connected to its inputs and digitized.
Figure 7. DDC114 Block Diagram
8
DDC11xEVM-PDK User's Guide SLAU234A–October 2007–Revised July 2010
Copyright © 2007–2010, Texas Instruments Incorporated