OPA861
www.ti.com
SBOS338–AUGUST 2005
TYPICAL CHARACTERISTICS: VS = +5V
At TA = +25°C, IQ = 4.7mA, and RL = 500Ω to VS/2, unless otherwise noted.
OTA TRANSCONDUCTANCE vs FREQUENCY
OTA TRANSCONDUCTANCE vs IQ
100
150
120
90
60
30
0
IOUT
IQ = 5.8mA
(93mA/V)
IQ = 4.7mA (80mA/V)
IQ = 3.1mA (60mA/V)
VIN
Ω
50
Ω
50
IQ = 1.65mA (37mA/V)
IOUT
VIN
Ω
50
Ω
50
Ω
RL = 50
VIN = 100mVPP
VIN = 10mVPP
10
1
10
100
1k
0
1
2
3
4
5
6
7
Frequency (Hz)
Quiescent Current (mA)
Figure 16.
Figure 17.
OTA TRANSCONDUCTANCE vs INPUT VOLTAGE
OTA TRANSFER CHARACTERISTICS
120
100
80
60
40
20
0
6
4
2
0
IQ = 5.8mA
IQ = 4.7mA
IQ = 5.8mA
IQ = 3.1mA
IQ = 3.1mA
IQ = 4.7mA
IQ = 1.65mA
IQ = 1.65mA
I
OUT
−
−
−
2
4
6
V
IN
Ω
50
Ω
50
Small−signal around input voltage.
−
−
−
−
−
−
−
−
20 10
30
20
10
0
10
20
30
50
40
30
0
10
20
30
40
50
Input Voltage (mV)
OTA Input Voltage (mV)
Figure 18.
Figure 19.
OTA SMALL-SIGNAL PULSE RESPONSE
OTA LARGE-SIGNAL PULSE RESPONSE
0.20
0.15
0.10
0.05
0
2.0
1.5
1.0
0.5
0
−
−
−
−
−
−
−
−
0.05
0.10
0.15
0.20
0.5
1.0
1.5
2.0
G = +5V/V
G = +5V/V
Ω
RL = 500
VIN = 0.7VPP
fIN = 20MHz
Ω
RL = 500
VIN = 0.07VPP
fIN = 20MHz
Time (10ns/div)
Time (10ns/div)
Figure 20.
Figure 21.
10
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