MAX4326 Maxim, MAX4326 Datasheet - Page 10

• Manufacturer Part Number: MAX4326
• Description: The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with rail-to-rail operation at the inputs and outputs
• Manufacturer: Maxim

Single/Dual/Quad, Low-Cost, UCSP/SOT23,
Low-Power, Rail-to-Rail I/O Op Amps
Figure 5. Small-Signal Transient Response with
Capacitive Load
10
The minimum output voltage is within millivolts of
ground for single-supply operation where the load is
referenced to ground (V
voltage range and output voltage swing of a MAX4322
connected as a voltage follower. With a 3V supply and
the load tied to ground, the output swings from 0 to
2.90V. The maximum output voltage swing depends on
the load, but is within 350mV of a 5V supply, even with
the maximum load (500 to ground).
Figure 3. Rail-to-Rail Input/Output Voltage Range
______________________________________________________________________________________
OUT
OUT
IN
IN
A
C
V
A
V
L
CC
V
I
= +1
= 500pF
BIAS
= +1
= 3V
=
Rail-to-Rail Output Stage
EE
V
400ns/div
2 s/div
DIFF
). Figure 3 shows the input
2k
- 1.8V
Driving a capacitive load can cause instability in most
high-speed op amps, especially those with low quies-
cent current. The MAX4322/MAX4323/MAX4326/
MAX4327/MAX4329 have a high tolerance for capaci-
tive loads. They are stable with capacitive loads up to
500pF. Figure 4 gives the stable operating region for
capacitive loads. Figures 5 and 6 show the response
with capacitive loads and the results of adding an iso-
lation resistor in series with the output (Figure 7). The
resistor improves the circuit’s phase margin by isolat-
ing the load capacitor from the op amp’s output.
The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329
amplifiers typically settle within 1µs after power-up.
Figure 6. Transient Response to Capacitive Load with
Isolation Resistor
Figure 4. Capacitive-Load Stability
10,000
1000
100
OUT
IN
100
A
C
R
V
S
L
Power-Up and Shutdown Mode
R
V
= +1
= 1000pF
= 39
L
OUT
TO V
= V
EE
CC
/ 2
RESISTIVE LOAD ( )
1k
400ns/div
UNSTABLE
REGION
10k
100k