OPA861
www.ti.com
SBOS338–AUGUST 2005
TYPICAL CHARACTERISTICS: VS = ±5V (continued)
At TA = +25°C, IQ = 5.4mA, and RL = 500Ω, unless otherwise noted.
B-INPUT RESISTANCE vs QUIESCENT CURRENT
C-OUTPUT RESISTANCE vs QUIESCENT CURRENT
500
120
110
100
90
490
480
470
460
450
440
430
80
70
60
50
40
7
8
9
10
11
12
13
7
8
9
10
11
12
13
Quiescent Current (mA)
Quiescent Current (mA)
Figure 7.
Figure 8.
E-OUTPUT RESISTANCE vs QUIESCENT CURRENT
INPUT VOLTAGE AND CURRENT NOISE DENSITY
60
50
40
30
20
10
0
100
√
E−Input Current Noise (5.2pA/ Hz)
10
√
B−Input Voltage Noise (2.4nV/ Hz)
√
B−Input Current Noise (1.65pA/ Hz)
1
7
8
9
10
11
12
13
100
1k
10k 100k 1M 10M
Quiescent Current (mA)
Frequency (Hz)
Figure 9.
Figure 10.
1MHz OTA VOLTAGE AND CURRENT NOISE DENSITY
vs QUIESCENT CURRENT ADJUST RESISTOR
QUIESCENT CURRENT vs RADJ
16
8
7
6
5
4
3
2
1
0
√
E−Input Current Noise (pA/ Hz)
14
12
10
8
√
B−Input Voltage Noise (nV/ Hz)
6
√
B−Input Current Noise (pA/ Hz)
4
2
0
0
200 400 600 800 1000 1200 1400 1600 1800 2000
0.1
1
10
100
1k
10k
)
100k
Ω
Quiescent Current Adjust Resistor (
)
Ω
Quiescent Current Adjust Resistor (
Figure 11.
Figure 12.
8
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