Texas Instruments THS1030/31EVM, Руководство пользователя

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Circuit Function
3-6
Figure 3–5. EVM Schematic Diagram – POWER_&_REF
GND
?
?
?
?
2
–
3
+
1 6
–
5
+
7
D1
LT1004-1.2
9
–
10
+
8
13
–
12
+
1 1
1 1
4MM Sockets
J9
J6
J8
J7
TP15
L1
+5 V
0.1
µ
F
C41 C40
10
µ
F
TP16
L2
DRVDD
0.1
µ
F
C42 C43
10
µ
F
AGND AGND
AGND AGND
0.1
µ
F
C46 C47
10
µ
F
L4
L3
0.1
µ
F
C45 C44
10
µ
F
J10
J11
TP19
TP20
TP21
TP22
AGND
Mounting Holes
MO1 MO2
MO3 MO4
+3TO5VA
R13
1 k
TP23
P2
10 k
8
6
4
AGND
AGND
AGND
R14
1 k5
C30
10
µ
F
P3
10 k
AGND
C34
10
µ
F
AGND
AGND
+3TO5VA
R16
5 k1
15 k
R15
AGND
11
GND
VDD
4
+3TO5VA
U7.A
TLV2464
AGND
11
GND
TLV2464
VDD
4
U7.B
R17
820R
C31
0.1
µ
F
+3TO5VA
+3TO5VA
R47
330R
Q1
2N3906
VDD
4
TLV2464
14
U7.D
11
GND
AGND
11 k
R55
R54
10k
AGND
11
TLV2464
AGND
VDD
4
+3TO5VA
U7.C
R53
180R
C32
10
µ
F
C33
0.1
µ
F
TP24
TP25
TP26
R58
180R
Q1
2N3904
C37
10
µ
F
C36
0.1
µ
F
AGND
AGND
AGND
R47
330R
R17
820R
C31
0.1
µ
F
EXT_T
COM
EXT_B
+3TO5VA
C39
0.1
µ
F
C38
470 pF
AGND
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