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Circuit Function
Figure 3–5. EVM Schematic Diagram – POWER_&_REF
4MM Sockets
TP15
+5 V
L1
?
J9
C41
C40
0.1 µ F
10 µ F
TP16
DRVDD
L2
?
J6
C42
C43
0.1 µ F
10 µ F
L4
?
J8
C46
C47
0.1 µ F
10 µ F
AGND
AGND
L3
?
J7
C45
C44
0.1 µ F
10 µ F
AGND
AGND
TP19 TP20 TP21 TP22
J10
AGND
J11
3.2 Circuit Function
The following paragraphs describe the function of individual circuits. Refer to
Chapter 4 for jumper configurations for various modes of operation, and to the
relevant data sheet for device operating characteristics.
3.2.1
Inputs
The EVM has one analog input via SMA connector J3. The path from this con-
nector to the THS1030/31 AIN pin can be configured to cater to different oper-
ating modes and input signal levels. The main operating modes are ac, dc, and
transformer coupled.
Note:
The transformer should be removed from the board in modes that do not use
the signal path through it.
The THS1031 has a clamp input that can be fed in directly via SMA connector
J5. This affords external digital control of the ADC's clamping function. The
ADC can be clamped (via the clamping pin) to either the device reference or
to ground using a jumper on H5.
SMA Connector J2 can be used to input a clock signal to the board from an
external source. If the source does not have the correct dc level for input to the
3-6
+3TO5VA
+3TO5VA
TP23
R13
1 k
P2
3
6
8
10 k
2
D1
C30
10 µ F
R14
1 k5
AGND
AGND
LT1004-1.2
AGND
4
R16
AGND
5 k1
AGND
+3TO5VA
P3
12 +
10 k
13 –
C34
10 µ F
AGND
AGND
R54
10k
AGND
Mounting Holes
MO1
MO2
1
1
MO3
MO4
1
1
+3TO5VA
+3TO5VA
VDD
R47
VDD
4 U7.B
330R
4
U7.A
5
+
R17
7
+
1
6
–
820R
–
TLV2464
C31
TLV2464
11
11
GND
GND
0.1 µ F
AGND
R15
15 k
VDD
AGND
4 TLV2464
GND
11
TLV2464
9
14
R17
–
8
10 +
U7.D
820R
U7.C
11
C31
VDD
4
R47
GND
330R
+3TO5VA
0.1 µ F
AGND
R55
AGND
11 k
+3TO5VA
C39
C38
0.1 µ F
470 pF
AGND
Q1
TP24
2N3906
EXT_T
R53
C32
C33
0.1 µ F
10 µ F
180R
AGND
TP25
COM
R58
TP26
180R
EXT_B
C37
C36
0.1 µ F
Q1
10 µ F
2N3904
AGND
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