Datasheet
Schematic
4-2
4.1 Schematic
The complete electrical schematic for the PGA2500EVM is shown in
Figure 4−1. Refer to the Bill of Materials in Table 4−1 for descriptions of compo-
nents shown in the schematic.
Figure 4−1. Schematic
R
T
S
2
3
1
G
J1
MICROPHONE INPUT
C21
1000pF
C22
1000pF
R16
6.81K
R17
6.81K
C19
47uF
C20
47uF
R7
10
R8
10
R5
*
R14
0
R6
*
R15
0
1
2
J2
1
2
3
4
5
6
J4
GPO1
1
GPO2
2
GPO3
3
GPO4
4
OVR
5
DGND
6
DCEN
7
0DB
8
ZCEN
9
SDI
10
CS
11
SCLK
12
SDO
13
VD−
14
VA−
15
VOUT−
16
VOUT+
17
VA+
18
VA+
19
VA−
20
CS22
21
CS21
22
CS12
23
CS11
24
VCOMIN
25
VIN−
26
VIN+
27
AGND
28
U1
PGA2500DB
C6
0.1uF
C8
0.1uF
C7
0.1uF
C11
0.1uF
C12
0.1uF
C27
4.7uF
−VA
C26
4.7uF
C9
0.1uF
C10
0.1uF
+VA
0dB
SDI
CS
SCLK
SDO
C13
0.1uF
C18
4.7uF
R9 10
NOTE: An asterisk (*) symbol indicates that a component is
not normally installed during assembly.
DCEN
ZCEN
−+
VCC EGND GND VCOM VA+ VA−
R4
*
R11
0
R10
0
1 2
JMP2
Cc1
*
Cc2
*
PHANTOM POWER
12
34
JMP1
C1
0.1uF
ONOFF
POWER
C3
0.1uF
C2
0.1uF
C15
4.7uF
C4
0.1uF
C16
4.7uF
C5
0.1uF
C17
4.7uF
1 2
3 4
JMP3
+VA
−VA
1 2
JMP4
1 2
JMP5
1 2
JMP6
1 2
JMP7
1 2
JMP8
R18
475
R19
475
R20
475
R21
475
R22
475
D1
GPO1
D2
GPO2
D3
GPO3
D4
GPO4
D5
OVR
1 2
JMP10
RN1
10K
VCC
1 8
2 7
3 6
4 5
SW1
OE1
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
A8
9
GND
10
Y8
11
Y7
12
Y6
13
Y5
14
Y4
15
Y3
16
Y2
17
Y1
18
OE2
19
VCC
20
U2
SN74AHCT541PW
C14
0.1uF
1 2
JMP9
SDO_RB
RN3
10K
2
4
6
1
3
5
78
910
J6
DATA_IN
2
4
6
1
3
5
78
910
J7
DATA_OUT
RN2
47K
VCC
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
J5
PARALLEL PORT
2
3
1
4
J3
PREAMP OUT
R2
*
R1
*
R3
*
R13
0
R12
0
C25
*
C23
*
C24
*
Normally, Cc1 and Cc2 are
replaced by wire jumpers.
VCC
VCC
TP7
VIN+
TP8
VIN−
TP3
VCC
TP1
AGND
TP2
EGND
TP5
VCOM
TP4
VA+
TP6
VA−
TP9
SPARE
C28
1000pF
D6
D7
D8
D9
TP10
AGND
−VA
−VA
+VA
+VA