OPA128 Burr-Brown, OPA128 Datasheet - Page 8

• Manufacturer Part Number: OPA128
• Description: Difet Electrometer-Grade OPERATIONAL AMPLIFIER
• Manufacturer: Burr-Brown

FIGURE 3. High Impedance (10
FIGURE 5. FET Input Instrumentation Amplifier for Biomedical Applications.
FIGURE 6. Low-Droop Positive Peak Detector.
500
®
Input
pH Probe
R
50mV Output
OPA128
S
500M
Guard
–In
+In
202
R
100k
2
3
G
2
3
10pF
OPA606
9.5k
1
15
1N914
OPA128
) Amplifier.
5
8
(1)
+15V
–15V
3
2
2
3
6
10k
7
4
OPA128
OPA128
10k
10k
NOTE: (1) Reverse polarity
for negative peak detection.
Differential Voltage Gain = 1 + 2R
6
Offset Trim
R
R
F
F
6
6
Output
1N914
1VDC
(1)
I
Gain = 100
CMRR
R
B
IN
100fA
10
1M
8
15
2
3
118dB
2N4117A
FIGURE 4. Piezoelectric Transducer Charge Amplifier.
(1)
F
25k
25k
/R
25k
G
Q
1
100pF
1000µF
Polystyrene
25k
Burr-Brown
Differential
3
2
Amplifier
INA105
OPA128
8
Droop
10
5
6
11
2
3
6
R
C
F
F
OPA128
Output
100µV/s
Low Frequency Cutoff =
1/(2
8
10pF
10
e = – Q/C
O
11
R
F
6
C
Output
F
) = 0.16Hz
Output
F
e
O