MAX4230AXK+T Maxim Integrated Products, MAX4230AXK+T Datasheet - Page 10

• Manufacturer Part Number: MAX4230AXK+T
• Description: IC OP AMP R-R W/SD SC70-5
• Manufacturer: Maxim Integrated Products

Specifications of MAX4230AXK+T

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 10 V/µs
• Gain Bandwidth Product: 10MHz
• Current - Input Bias: 50pA
• Voltage - Input Offset: 850µV
• Current - Supply: 1.2mA
• Current - Output / Channel: 200mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V, ±1.35 V ~ 2.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-5, SC-88A, SOT-323-5, SOT-353, 5-TSSOP
• Number Of Channels: 1
• Voltage Gain Db: 100 dB
• Common Mode Rejection Ratio (min): 52 dB
• Input Offset Voltage: 6 mV
• Operating Supply Voltage: 3 V, 5 V
• Maximum Power Dissipation: 247 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Maximum Dual Supply Voltage: +/- 2.5 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: MAX4230AXK+T; MAX4230AXK+TTR

High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Choose gain-setting resistors R
the amount of desired gain, keeping in mind the maxi-
mum output amplitude. The output coupling capacitor,
C
put, preventing DC current flowing to the load. The out-
put capacitor and the load impedance form a highpass
filer with the -3dB point determined by:
For a 32Ω load, a 100µF aluminum electrolytic capaci-
tor gives a low-frequency pole at 50Hz.
The circuit shown in Figure 3 uses a dual MAX4230 to
implement a 3V, 200mW amplifier suitable for use in
size-constrained applications. This configuration elimi-
nates the need for the large coupling capacitor
required by the single op-amp speaker driver when sin-
gle-supply operation is necessary. Voltage gain is set
to 10V/V; however, it can be changed by adjusting the
82kΩ resistor value.
The MAX4230–MAX4234 CMOS op amps have parallel-
connected n- and p-channel differential input stages
that combine to accept a common-mode range extend-
ing to both supply rails. The n-channel stage is active
for common-mode input voltages typically greater than
(V
common-mode input voltages typically less than (V
1.2V).
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
10
0.5V
OUT
SS
0.1µF
P-P
______________________________________________________________________________________
C2
, blocks the DC component of the amplifier out-
+ 1.2V), and the p-channel stage is active for
0.1µF
C1
3V
16kΩ
R1
R5
51kΩ
R6
51kΩ
f
−
3
2
3
dB
3V
8
=
82kΩ
4
R2
2π
Rail-to-Rail Input Stage
1
MAX4232
R C
1/2
L OUT
10kΩ
1
R3
IN
and R
Bridge Amplifier
6
5
10kΩ
F
R4
MAX4232
according to
7
1/2
fs = 100Hz
32Ω
DD
-
The minimum output is within millivolts of ground for sin-
gle-supply operation, where the load is referenced to
ground (V
and the output voltage swing of a MAX4230 connected
as a voltage follower. The maximum output voltage
swing is load dependent; however, it is guaranteed to
be within 500mV of the positive rail (V
with maximum load (32Ω to ground).
Observe the Absolute Maximum Ratings for power dis-
sipation and output short-circuit duration (10s, max)
because the output current can exceed 200mA (see
the Typical Operating Characteristics .)
One consequence of the parallel-connected differential
input stages for rail-to-rail operation is a relatively large
input capacitance C
at frequency (2πR′C
nation of the gain-setting resistors for the inverting or
noninverting amplifier configuration (Figure 5). If the pole
frequency is less than or comparable to the unity-gain
bandwidth (10MHz), the phase margin is reduced, and
the amplifier exhibits degraded AC performance through
either ringing in the step response or sustained oscilla-
tions. The pole frequency is 10MHz when R′ = 2kΩ. To
maximize stability, R′ << 2kΩ is recommended.
Figure 4. Rail-to-Rail Input/Output Range
1V/div
1V/div
SS
OUT
IN
). Figure 4 shows the input voltage range
V
R
CC
L
= 100kΩ
= 3.0V
IN
IN
)
-1
(5pF typ). This introduces a pole
Rail-to-Rail Output Stage
, where R′ is the parallel combi-
5µs/div
Input Capacitance
DD
= 2.7V) even