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1.5 EVM Circuit Configuration
The THS7001 EVM design allows evaluation of each section of the THS7001
amplifier IC separately. Configuration of the EVM is accomplished through
jumpers mounted on the module PCB. Each jumper is a three-pin header that
acts as an SPDT switch when a shunt is placed across two of the three pins
to select either of two signal routes (Figure 1–4).
Figure 1–4. THS7001 Evaluation Module Block Diagram
Input A
J6
For example, to use the preamplifier as a buffer and gain:
1) Set JP1 to 2–3
2) Set JP2 to 2–3
3) Set JP3 to 2–3
4) Apply the input to input A (J6)
1
5 V
2
15 V
3
JP3
U1:A
1
2
–
2
THS7001
+
3
JP2
Preamp
Jumper JP1:
J
1–2 — Connects the input of the PGA (U1: B) to the input A BNC (J6),
bypassing the THS7001 preamplifier (U1:A)
J
2–3 — Connects the input of A-channel PGA (U1: B) to the output of
the A-channel preamplifier (U1:A)
Jumper JP2:
J
1–2 — Connects the inverting input terminal of the preamplifier (U1:A)
to the input A BNC (J6). In order to use this functionality, components
R1, R2, and C3 must be selected and installed on the EVM by the user
J
2–3 — Connects the noninverting input terminal of the preamplifier
(U1:A) to the input A BNC (J6)
Jumper JP3:
J
1–2 — Connects the THS7001 IC positive clamp input pin (VH) to
+V
CC
J
2–3 — Connects the THS7001 IC positive clamp input pin (VH) to +5V
EVM Circuit Configuration
VH Clamp
U1: B
PGA A
1
Output
THS7001
3
Preamp A
JP1
Output
PGA
General Information
J9
J5
1-9
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