Datasheet

MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= +15V, V
EE
= -15V, V
IN+
= V
IN-
= V
GND
= 0V, R
OUT
= 100kΩ to GND, T
A
= -40°C to +125°C, typical values are at T
A
= +25°C,
unless otherwise noted.)
LARGE SIGNAL-STEP RESPONSE
MAX9945 toc19
1
μ
s/div
+1V
-1V
V
OUT
500mV/div
A
V
= 1V/V
V
IN
= 2V
P-P
R
L
= 10kΩ
C
L
= 100pF
SMALL SIGNAL-STEP RESPONSE
MAX9945 toc20
2
μ
s/div
+20mV
-20mV
V
OUT
10mV/div
A
V
= 1V/V
V
IN
= 40mV
P-P
R
L
= 100kΩ
LARGE-SIGNAL RESPONSE
vs. FREQUENCY
MAX9945 toc17
FREQUENCY (kHz)
OUTPUT VOLTAGE (V
P-P
)
10,000100010010
5
10
15
25
20
30
0
1
R
LOAD
= 100kΩ
LARGE SIGNAL-STEP RESPONSE
MAX9945 toc18
4
μ
s/div
+5V
-5V
V
OUT
2.5V/div
A
V
= 1V/V
V
IN
= 10V
P-P
R
L
= 10kΩ
C
L
= 100pF
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX9945 toc16
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1M100k10k1k100
0.10
1.00
10.00
100.00
1000.00
0.01
10 10M
ACL = 10
ACL = 1
OP-AMP STABILITY
vs. CAPACITIVE AND RESISTIVE LOADS
MAX9945 toc15
PARALLEL LOAD RESISTANCE (kΩ)
PARALLEL LOAD CAPACITANCE (pF)
10,000100 1000
1000
100
10,000
10
10
STABLE
UNSTABLE