TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, V
S
= +5V, and R
L
= 10kΩ connected to V
S
/2, unless otherwise noted.
OPEN-LOOP GAIN/PHASE vs FREQUENCY
120
100
OPA344
80
Phase
60
0
30
120
100
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0
30
OPA345
80
Phase
60
90
120
Gain
150
180
10M
20
0
0.1
1
10
100
1k
10k
100k
1M
Frequency (Hz)
150
180
10M
Gain (dB)
Gain (dB)
Phase (°)
60
40
Gain
20
0
0.1
1
10
100
1k
10k
100k
1M
Frequency (Hz)
90
120
60
40
POWER SUPPLY AND COMMON-MODE
REJECTION RATIO vs FREQUENCY
100
+PSRR
Maximum Output Voltage (Vp-p)
6
5
4
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
V
S
= +5.5V
V
S
=
+5V
OPA344
3
2
1
0
100k
V
S
= +2.7V
OPA345
80
Rejection Ratio (dB)
CMRR
–PSRR
60
40
20
10
10
100
1k
Frequency (Hz)
10k
100k
1M
Frequency (Hz)
10M
CHANNEL SEPARATION vs FREQUENCY
140
VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
10000
100
Channel Separation (dB)
Voltage Noise (nV/√Hz)
120
1000
V
N
100
I
N
10
100
80
Dual and quad devices.
G = 1, all channels.
Quad measured channel
A to D or B to C—other
combinations yield improved
rejection.
100
1k
10k
Frequency (Hz)
100k
1M
1
60
10
1
10
100
1k
10k
100k
1M
Frequency (Hz)
0.1
10M
5
OPA344, 2344, 4344
OPA345, 2345, 4345
Current Noise (fA/√Hz)
®
Phase (°)
BURR-BROWN [ BURR-BROWN CORPORATION ]
