MAX4232AKA-T [MAXIM]
Operational Amplifier ; 运算放大器\n
| 型号： | MAX4232AKA-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Operational Amplifier
|
| 文件： | 总16页 (文件大小：577K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2164; Rev 2; 7/02
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
General Description
Features
The MAX4230–MAX4234 single/dual/quad, high-output-
drive CMOS op amps feature 200mA of peak output
current, Rail-to-Rail® input, and output capability from a
single 2.7V to 5.5V supply. These amplifiers exhibit a
high slew rate of 10V/µs and a gain-bandwidth product
(GBWP) of 10MHz. The MAX4230–MAX4234 can drive
typical headset levels (32Ω), as well as bias an RF
power amplifier (PA) in wireless handset applications.
ꢀ 30mA Output Drive Capability
ꢀ Rail-to-Rail Input and Output
ꢀ 1.1mA Supply Current per Amplifier
ꢀ 2.7V to 5.5V Single-Supply Operation
ꢀ 10MHz Gain-Bandwidth Product
ꢀ High Slew Rate: 10V/µs
The MAX4230 comes in a tiny 5-pin SC70 package and
the MAX4231, single with shutdown, is offered in the
6-pin SC70 package. The dual op-amp MAX4233 is
offered in the space-saving 10-bump UCSP™, provid-
ing the smallest footprint area for a dual op amp with
shutdown.
ꢀ 100dB Voltage Gain (R = 100kΩ)
L
ꢀ 85dB Power-Supply Rejection Ratio
ꢀ No Phase Reversal for Overdriven Inputs
ꢀ Unity-Gain Stable for Capacitive Loads to 780pF
These op amps are designed to be part of the PA con-
trol circuitry, biasing RF PAs in wireless headsets. The
MAX4231/MAX4233 offer a SHDN feature that drives
the output low. This ensures that the RF PA is fully dis-
abled when needed, preventing unconverted signals to
the RF antenna.
ꢀ Low-Power Shutdown Mode Reduces Supply
Current to <1µA
ꢀ Available in 5-Pin SC70 Package (MAX4230)
ꢀ Available in 10-Bump UCSP Package (MAX4233)
The MAX4230 family offers low offsets, wide bandwidth,
and high-output drive in a tiny 2.1mm x 2.0mm space-
saving SC70 package. These parts are offered over the
automotive temperature range (-40°C to +125°C).
Ordering Information
TOP
PIN-
PART
TEMP RANGE
PACKAGE
MARK
MAX4230AXK-T
MAX4230AUK-T
MAX4231AXT-T
MAX4231AUT-T
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
5 SC70-5
5 SOT23-5
6 SC70-6
6 SOT23-6
ACS
ABZZ
ABA
Applications
RF PA Biasing Controls in Handset Applications
Portable/Battery-Powered Audio Applications
Portable Headphone Speaker Drivers (32Ω)
Audio Hands-Free Car Phones (Kits)
Laptop/Notebook Computers/TFT Panels
Sound Ports/Cards
AAUV
Ordering Information continued at end of data sheet.
Typical Operating Circuit
Set-Top Boxes
ANTENNA
Digital-to-Analog Converter Buffers
Transformer/Line Drivers
2.7V TO 5.5V
PA
Motor Drivers
I
= 30mA
OUT
DAC
R
ISO
MAX4231
SHDN
C
LOAD
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
C
R
R
F
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to V )....................................................6V
8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW
10-Bump UCSP (derate 6.1mW/°C above +70°C) .....484mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ........727mW
14-Pin SO (derate 8.3mW/°C above +70°C) ...............667mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
SS
All Other Pins....................................(V - 0.3V) + (V
+ 0.3V)
SS
DD
Output Short-Circuit Duration to V or V (Note 1) ..................1s
DD
SS
Continuous Power Dissipation (T = +70°C)
A
5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........696mW
8-Pin SOT23 (derate 8.9mW/°C above +70°C) ...........714mW
Note 1: Package power dissipation should also be observed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
= 2.7V, V = 0V, V
= V /2, V
= (V /2), R = ∞ connected to (V /2), V
= V , T = +25°C, unless otherwise
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
3
UNITS
Operating Supply Voltage Range
Input Offset Voltage
V
Inferred from PSRR test
All parts except MAX4232AKA
MAX4232AKA
2.7
V
DD
0.85
V
mV
OS
6
Input Bias Current
Input Offset Current
Input Resistance
I
V
V
= V to V
50
50
pA
pA
B
CM
CM
SS
DD
DD
I
= V to V
SS
OS
R
1000
MΩ
IN
Common-Mode Input Voltage
Range
V
Inferred from CMRR test
V
V
DD
V
CM
SS
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Shutdown Output Impedance
Output Voltage in Shutdown
CMRR
PSRR
V
V
V
V
< V
< V
DD
52
70
85
dB
dB
Ω
SS
CM
= 2.7V to 5.5V
73
DD
R
= 0V (Note 3)
10
OUT
OUT(SHDN)
SHDN
SHDN
V
= 0V, R = 200Ω (Note 3)
68
120
mV
L
R = 100kΩ
100
98
L
V
< V
+ 0.20 < V
OUT
SS
Large-Signal Voltage Gain
A
R = 2kΩ
L
85
74
dB
VOL
- 0.20V
DD
R = 200Ω
L
80
V
V
V
V
V
V
- V
400
360
80
500
500
120
120
14
DD
OL
DD
OL
DD
OL
OH
R = 32Ω
L
- V
- V
SS
OH
SS
Output Voltage Swing
V
R = 200Ω
L
mV
OUT
- V
- V
70
8
OH
SS
RL = 2kΩ
- V
7
14
Output Source/Sink Current
V
= 0.15V to (V
- 0.15V)
7
10
mA
mV
OUT
DD
V
V
V
V
- V
128
112
240
224
200
175
320
300
DD
OL
DD
OL
OH
I = 10mA
L
V
V
= 2.7V
= 5V
DD
DD
- V
- V
SS
Output Voltage with Current Load
OH
SS
I = 30mA
L
- V
2
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC ELECTRICAL CHARACTERISTICS (continued)
(V
= 2.7V, V = 0V, V
= V /2, V
= (V /2), R = ∞ connected to (V /2), V
= V , T = +25°C, unless otherwise
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.2
1.1
0.5
0.1
MAX
2.3
2.0
1
UNITS
V
V
= 5.5V, V
= 2.7V, V
= V
= V
/ 2
/ 2
DD
DD
CM
CM
DD
DD
Quiescent Supply Current (per
Amplifier)
I
mA
DD
V
= 5.5V
= 2.7V
DD
DD
Shutdown Supply Current (per
Amplifier) (Note 3)
I
V
= 0V, R = ∞
µA
DD(SHDN)
S HDN
L
V
1
Shutdown mode (Note 3)
Normal mode (Note 3)
V
+ 0.3
SS
SHDN Logic Threshold
SHDN Input Bias Current
V
V
- 0.3
DD
V
< V
< V (Note 3)
DD
50
pA
SS
S HDN
DC ELECTRICAL CHARACTERISTICS
(V
= 2.7V, V = 0V, V
= V /2, V
= (V /2), R = ∞ connected to (V /2), V
= V , T = -40 to +125°C, unless oth-
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
erwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Inferred from PSRR test
MIN
2.7
TYP
MAX
UNITS
Operating Supply Voltage
Range
V
5.5
V
DD
OS
All parts except MAX4232AKA
MAX4232AKA
5
8
Input Offset Voltage
V
mV
µV/°C
V
Offset Voltage Tempco
∆V /∆T
3
OS
Common-Mode Input Voltage
Range
V
Inferred from CMRR test
V
V
DD
CM
SS
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Voltage in Shutdown
CMRR
PSRR
V
V
V
< V
< V
DD
46
70
dB
dB
mV
SS
CM
= 2.7V to 5.5V
DD
V
< 0V, R = 200Ω (Note 3)
150
OUT(SHDN)
SHDN
L
R = 2kΩ
76
67
L
Large-Signal Voltage Gain
A
V
+ 0.2V < V - 0.2V
DD
dB
VOL
SS
R = 200Ω
L
V
V
V
V
V
V
- V
650
650
150
150
20
DD
OL
DD
OL
DD
OL
OH
R = 32Ω, T = +85°C
L
A
- V
- V
SS
OH
SS
Output Voltage Swing
V
R = 200Ω
L
mV
OUT
- V
- V
OH
SS
R = 2kΩ
L
- V
20
Output Source/Sink Current
V
= 0.15V to (V
- 0.15V)
4
mA
mV
OUT
DD
V
V
- V
250
230
DD
OL
OH
SS
I = 10mA
L
V
= 2.7V
DD
- V
Output Voltage with Current Load
I = 30mA,
L
V
V
- V
OH
400
370
DD
OL
T
= -40°C
V
= 5V
A
DD
- V
SS
to +85°C
_______________________________________________________________________________________
3
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC ELECTRICAL CHARACTERISTICS (continued)
(V
= 2.7V, V = 0V, V
= V /2, V
DD
= (V /2), R = ∞ connected to (V /2), V
= V , T = -40 to +125°C, unless oth-
SHDN DD A
DD
SS
CM
OUT
DD
L
DD
erwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
2.8
UNITS
V
V
= 5.5V, V
= V /2
DD
DD
DD
CM
CM
Quiescent Supply Current
(per Amplifier)
I
mA
DD
= 2.7V, V
= V /2
2.5
DD
V
V
= 5.5V
2.0
DD
DD
Shutdown Supply Current
(per Amplifier) (Note 3)
I
V
< 0, R = ∞
µA
DD(SHDN)
SHDN
L
= 2.7V
2.0
AC ELECTRICAL CHARACTERISTICS
(V = 2.7V, V = 0V, V
= V /2, V
= (V /2), R = ∞ connected to (V /2), V
= V , T = +25°C, unless otherwise noted.)
DD
SS
CM
DD
OUT
DD
L
DD
SHDN
DD
A
(Note 2)
PARAMETER
SYMBOL
GBWP
FPBW
SR
CONDITIONS
MIN
TYP
10
MAX
UNITS
MHz
Gain-Bandwidth Product
Full-Power Bandwidth
Slew Rate
V
= V /2
CM DD
V
= 2V , V
= 5V
0.8
10
MHz
OUT
P-P DD
V/µs
Phase Margin
PM
70
Degrees
dB
Gain Margin
GM
15
Total Harmonic Distortion Plus
Noise
THD+N
f = 10kHz, V
= 2V , A
= 1V/V
0.0005
%
OUT
P-P VCL
Input Capacitance
C
8
15
12
125
780
1
pF
IN
f = 1kHz
Voltage Noise Density
e
nV/√Hz
n
f = 10kHz
Channel-to-Channel Isolation
Capacitive Load Stability
Shutdown Time
f = 1kHz, R = 100kΩ
dB
pF
µs
µs
µs
L
A
= 1V/V, no sustained oscillations
VCL
t
(Note 3)
(Note 3)
SHDN
Enable Time from Shutdown
Power-Up Time
t
1
ENABLE
t
5
ON
Note 2: All units 100% tested at +25°C. All temperature limits are guaranteed by design.
Note 3: SHDN logic parameters are for MAX4231/MAX4233 only.
4
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
__________________________________________Typical Operating Characteristics
(V = 2.7V, V = 0V, V
= V /2, V
= V /2, R = ∞, connected to V /2, V
= V , T = +25°C, unless otherwise noted.)
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
GAIN AND PHASE vs. FREQUENCY
(C = 250pF)
GAIN AND PHASE vs. FREQUENCY
L
MAX4230 toc02
MAX4230 toc01
70
60
50
120
90
70
120
60
50
90
60
60
40
30
30
0
40
30
30
0
20
-30
20
-30
10
-60
10
-60
0
-90
0
-90
-10
-20
-30
-120
-150
-180
-10
-20
-30
-120
-150
-180
A
= 1000V/V
V
C = 250pF
L
A
= 1000V/V
V
0.01k 0.1k 1k
10k 100k 1M 10M 100M
0.01k 0.1k 1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT IMPEDANCE vs. FREQUENCY
1000
100
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1
0.1
A
= 1V/V
1M
A = 1V/V
V
V
0.01
0.01k 0.1k
1k
10k 100k
10M
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY CURRENT vs. TEMPERATURE
(SHDN = LOW)
SUPPLY CURRENT vs. TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
110
100
90
80
70
60
SHDN = V
SS
50
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
____________________________Typical Operating Characteristics (continued)
(V = 2.7V, V = 0V, V
= V /2, V
= V /2, R = ∞, connected to V /2, V
= V , T = +25°C, unless otherwise noted.)
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
OUTPUT SWING HIGH
vs. TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
2
1
2.0
V
= 5.0V
R = 200Ω
DD
L
100
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
= 2.7V
DD
80
V
= 2.7V
DD
R = 200Ω
L
60
40
20
0
V
= 5.0V
0
DD
-1
-2
20
TEMPERATURE (°C)
100
120
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
40 60 80
OUTPUT SWING LOW
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
140
120
100
80
1.0
0.5
0
1.2
V
L
= 5.0V
DD
1.0
0.8
R = 200Ω
-0.5
-1.0
60
V
= 2.7V
DD
0.6
0.4
0.2
R = 200Ω
L
40
-1.5
-2.0
V
= 2.7V
2.0
20
DD
0
1.5
COMMON-MODE VOLTAGE (V)
1.5
-40 -20
0
20 40 60 80 100 120
0
0.5
1.0
2.0
2.5
0
0.5
1.0
2.5
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
TOTAL HARMONIC DISTORTION
+ NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION + NOISE
vs. PEAK-TO-PEAK OUTPUT VOLTAGE
0.45
10
1
1.4
1.2
1.0
0.8
0.6
0.4
0.2
V
= 2V
f = 10kHz
DD
OUT
P-P
0.40
0.35
500kHz LOWPASS FILTER
V
= 5V
R = 100kΩ
L
R = 2kΩ
L
R = 250Ω
L
0.30
0.25
R = 25Ω
L
0.20
0.15
0.10
0.1
V
= 5.0V
DD
R = 32Ω
L
0.001
0.05
0
R = 10kΩ
L
0.0001
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON-MODE VOLTAGE (V)
4.8
10
100
1k
FREQUENCY (Hz)
10k
100k
4.0
4.2
4.4
4.6
5.0
PEAK-TO-PEAK (V)
6
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
____________________________Typical Operating Characteristics (continued)
(V = 2.7V, V = 0V, V
= V /2, V
= V /2, R = ∞, connected to V /2, V
= V , T = +25°C, unless otherwise noted.)
SHDN DD A
DD
SS
CM
DD
OUT
DD
L
DD
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4230/34 toc18
MAX4230/34 toc17
MAX4230/34 toc16
IN
IN
IN
1V/div
OUT
50mV/div
OUT
50mV/div
OUT
400ns/div
400ns/div
400ns/div
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, V = 2.7V)
(SOURCING, V = 2.7V)
DD
DD
MAX4230/34 toc19
0
-10
-20
-30
-40
-50
-60
-70
-80
80
70
60
50
40
30
20
10
0
V
= 100mV
V
= 100mV
DIFF
DIFF
IN
1V/div
OUT
400ns/div
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
OUTPUT VOLTAGE (V)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
OUTPUT VOLTAGE (V)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
INPUT VOLTAGE NOISE
vs. FREQUENCY
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, V = 5.0V)
DD
(SINKING, V = 5.0V)
DD
250
200
150
100
50
200
100
0
-50
V
= 100mV
DIFF
V
= 100mV
DIFF
-100
-150
-200
-250
0
10
100
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1k
10k
100k
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
FREQUENCY (Hz)
OUTPUT VOLTAGE (V)
_______________________________________________________________________________________
7
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Pin Description
PIN
MAX4234
TSSOP/
SO
MAX4230
SOT23/
SC70
MAX4231
SOT23/
SC70
MAX4232
SOT23/
µMAX
NAME
FUNCTION
MAX4233
µMAX
MAX4233
UCSP
1
2
1
2
—
—
—
—
IN+
Noninverting Input
Negative Supply Input. Connect to
ground for single-supply operation.
4
4
B4
4
V
SS
3
4
5
3
4
6
—
—
8
—
—
10
—
—
—
—
11
IN-
Inverting Input
OUT
Amplifier Output
Positive Supply Input
B1
V
DD
SHDN,
SHDN1,
SHDN2
Shutdown Control. Tie to high for normal
operation.
—
5
—
5, 6
C4, A4
—
—
—
—
—
—
—
—
—
—
—
—
—
3
2
1
5
6
7
3
2
1
7
8
9
C3
C2
C1
A3
A2
A1
3
2
1
5
6
7
IN1+
IN1-
Noninverting Input to Amplifier 1
Inverting Input to Amplifier 1
Amplifier 1 Output
OUT1
IN2+
IN2-
Noninverting Input to Amplifier 2
Inverting Input to Amplifier 2
Amplifier 2 Output
OUT2
IN3+,
IN4+
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
10, 12
9, 13
8, 14
Noninverting Input to Amplifiers 3 and 4
Inverting Input to Amplifiers 3 and 4
Amplifiers 3 and 4 Outputs
IN3-, IN4-
OUT3,
OUT4
power dissipation is not exceeded for any of the package
types offered. There are some exceptions to this rule,
however. The absolute maximum power-dissipation rating
of each package should always be verified using the fol-
lowing equations. The equation below gives an approxi-
mation of the package power dissipation:
Detailed Description
Rail-to-Rail Input Stage
The MAX4230–MAX4234 CMOS operational amplifiers
have parallel-connected N- and P-channel differential
input stages that combine to accept a common-mode
range extending to both supply rails. The N-channel
stage is active for common-mode input voltages typi-
P
≅ V
I
COS θ
IC DISS
RMS RMS
(
)
cally greater than (V
+ 1.2V), and the P-channel
SS
where:
stage is active for common-mode input voltages typi-
cally less than (V - 1.2V).
V
= RMS voltage from V
to V
OUT
when sourcing
OUT
RMS
DD
DD
current and RMS voltage from V
to V when sink-
SS
Applications Information
ing current.
I
= RMS current flowing out of or into the op amp
RMS
and the load.
Package Power Dissipation
Warning: Due to the high output current drive, this op
amp can exceed the absolute maximum power-dissi-
pation rating. As a general rule, as long as the peak cur-
rent is less than or equal to 40mA, the maximum package
θ = phase difference between the voltage and the cur-
rent. For resistive loads, COS θ = 1.
8
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
R
F
3.6V
C
IN
R
IN
C
LEFT
OUT
AUDIO INPUT
HEADPHONE JACK
TO 32Ω STEREO
HEADSET
R
R
C
V
= 2V
P-P
IN
V
BIAS
MAX4230
MAX4230
MAX4231
C
R
IN
IN
32Ω
RIGHT
AUDIO INPUT
C
OUT
R
F
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
Figure 2. Circuit Example: Adding a Coupling Capacitor
Greatly Reduces Power Dissipation of its Package
For example, the circuit in Figure 1 has a package
power dissipation of 196mW:
V
PEAK
V
≅
=
RMS
2
V
PEAK
≅ V − V
+
1.0V
(
)
RMS
DD
DC
= 0.707V
2
RMS
2
1.0V
= 3.6V − 1.8V +
= 2.507V
RMS
I
1.0V/ 32Ω
PEAK
I
≅ I
+
= 0A +
2
RMS
DC
2
2
I
1.8V
32Ω
1.0V/32Ω
PEAK
I
≅ I
+
=
+
= 22.1mA
RMS DC
RMS
2
2
Therefore:
= 78.4mA
RMS
P
= V
I
COS θ
IC(DISS)
RMS RMS
where:
= 15.6mW
V
DC
= the DC component of the output voltage.
= the DC component of the output current.
= the highest positive excursion of the AC com-
If the configuration in Figure 1 were used with all four of
the MAX4234 amplifiers, the absolute maximum power-
dissipation rating of this package would be exceeded
(see the Absolute Maximum Ratings section).
I
DC
V
PEAK
ponent of the output voltage.
I
= the highest positive excursion of the AC com-
PEAK
60mW Single-Supply Stereo
Headphone Driver
Two MAX4230/MAX4231s can be used as a single-sup-
ply, stereo headphone driver. The circuit shown in
Figure 2 can deliver 60mW per channel with 1% distor-
tion from a single 5V supply.
ponent of the output current.
Therefore:
P
= V
I
COS θ
IC(DISS)
RMS RMS
= 196mW
Adding a coupling capacitor improves the package
power dissipation because there is no DC current to
the load, as shown in Figure 2:
The input capacitor (C ), in conjunction with R , forms
IN
IN
a highpass filter that removes the DC bias from the
incoming signal. The -3dB point of the highpass filter is
given by:
1
f
=
−3dB
2πR C
IN IN
_______________________________________________________________________________________
9
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
C1
0.1µF
V
= 3.0V
R1
16kΩ
R2
82kΩ
CC
R = 100kΩ
L
0.5V
P-P
1/2
IN
(1V/div)
3V
3V
MAX4232
8
2
1
R5
51kΩ
3
32Ω
fs = 100Hz
4
R4
10kΩ
R3
10kΩ
OUT
(1V/div)
C2
0.1µF
6
5
R6
51kΩ
7
1/2
TIME (5µs/div)
MAX4232
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
Figure 4. Rail-to-Rail Input/Output Range
Choose gain-setting resistors R and R according to
Rail-to-Rail Output Stage
IN
F
the amount of desired gain, keeping in mind the maxi-
mum output amplitude. The output coupling capacitor,
The minimum output is within millivolts of ground for sin-
gle-supply operation, where the load is referenced to
C
, blocks the DC component of the amplifier out-
ground (V ). Figure 4 shows the input voltage range
SS
OUT
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:
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
= 2.7V) even
DD
with maximum load (32Ω to ground).
1
f
=
−3dB
2πR C
The MAX4230–MAX4234 incorporate a smart short-cir-
cuit protection feature. When V is shorted to V or
L
OUT
OUT
DD
For a 32Ω load, a 100µF aluminum electrolytic capaci-
tor gives a low-frequency pole at 50Hz.
V
SS
, the device detects a fault condition and limits the
output current, therefore protecting the device and the
application circuit. If V is shorted to any voltage
OUT
Bridge Amplifier
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.
other than V
or V , the smart short-circuit protection
DD
SS
is not activated. When the smart short circuit is not
active, the output currents can exceed 200mA (see
Typical Operating Characteristics.)
Input Capacitance
One consequence of the parallel-connected differential
input stages for rail-to-rail operation is a relatively large
input capacitance C (5pF typ). This introduces a pole
IN
-1
at frequency (2πR′C ) , where R′ is the parallel combi-
IN
Rail-to-Rail Input Stage
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
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.
(V
+ 1.2V), and the P-channel stage is active for
SS
common-mode input voltages typically less than (V
-
DD
1.2V).
10 ______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
2500
C
INVERTING
f
2000
1500
1000
500
0
R
UNSTABLE
f
R
V
IN
STABLE
V
OUT
MAX4230
R′ = R || R
f
R C = RC
f
f
IN
V
L
= 5.0V
DD
DD
R TO V /2
1
10
100
1k
10k
100k
RESISTIVE LOAD (Ω)
NONINVERTING
V
IN
Figure 6. Capacitive Load Stability
V
OUT
MAX4230
R
f
C
f
20mV/div
20mV/div
R′ = R || R
f
R
R C = RC
f
f
IN
V
= 3.0V, C = 1500pF
L
DD
R = 100kΩ, R = 0Ω
L
ISO
Figure 5. Inverting and Noninverting Amplifiers with Feedback
Compensation
1µs/div
Figure 7. Small-Signal Transient Response with Excessive
Capacitive Load
To improve step response when R′ > 2kΩ, connect
small capacitor C between the inverting input and out-
f
put. Choose C as follows:
f
C = 8(R / R ) [pf]
f
f
where R is the feedback resistor and R is the gain-set-
f
ting resistor (Figure 5).
20mV/div
20mV/div
Driving Capacitive Loads
The MAX4230–MAX4234 have a high tolerance for
capacitive loads. They are stable with capacitive loads
up to 780pF. Figure 6 is a graph of the stable operating
region for various capacitive loads vs. resistive loads.
Figures 7 and 8 show the transient response with
excessive capacitive loads (1500pF), with and without
the addition of an isolation resistor in series with the
output. Figure 9 shows a typical noninverting capaci-
tive-load-driving circuit in the unity-gain configuration.
V
= 3.0V, C = 1500pF
L
DD
R = 100kΩ, R = 39Ω
L
ISO
1µs/div
Figure 8. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
______________________________________________________________________________________ 11
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
SHDN
2V/div
I
DD
1mA/div
R
ISO
C
L
OUT
2V/div
100µs/div
Figure 9. Capacitive-Load-Driving Circuit
Figure 11. Shutdown Enable/Disable Supply Current
1V/div
V
DD
2V/div
I
DD
1mA/div
1V/div
4µs/div
40µs/div
Figure 10. Shutdown Output Voltage Enable/Disable
Figure 12. Power-Up/Down Supply Current
The resistor improves the circuit’s phase margin by iso-
lating the load capacitor from the op amp’s output.
Selector Guide
AMPS PER
PACKAGE
SHUTDOWN
MODE
PART
Power-Up and Shutdown Modes
The MAX4231/MAX4233 have a shutdown option.
When the shutdown pin (SHDN) is pulled low, supply
MAX4230
MAX4231
MAX4232
MAX4233
MAX4234
Single
Single
Dual
—
Yes
—
current drops to 0.5µA per amplifier (V
= 2.7V), the
DD
amplifiers are disabled, and their outputs are driven to
Dual
Yes
—
V
. Since the outputs are actively driven to V in
SS
SS
shutdown, any pullup resistor on the output causes a
current drain from the supply. Pulling SHDN high
enables the amplifier. In the dual MAX4233, the two
amplifiers shut down independently. Figure 10 shows
the MAX4231’s output voltage to a shutdown pulse. The
MAX4231–MAX4234 typically settle within 5µs after
Quad
When exiting shutdown, there is a 6µs delay before the
amplifier’s output becomes active (Figure 10).
power-up. Figures 11 and 12 show I
plus and voltage power-up cycle.
to a shutdown
DD
12 ______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Pin Configurations
TOP VIEW
1
2
3
5
4
V
DD
IN+
OUT1
IN1-
1
2
3
4
8
7
6
5
V
DD
IN+
1
2
3
6
5
4
V
DD
MAX4231
OUT2
IN2-
MAX4230
MAX4232
V
V
SHDN
OUT
SS
SS
IN1+
V
IN2+
SS
IN-
OUT
IN-
SOT23/µMAX
SOT23/SC70
SC70/SOT23
A4
A2
A3
A1
OUT1
IN1-
1
2
3
4
5
6
7
14 OUT4
13 IN4-
12 IN4+
OUT1
IN1-
1
2
3
4
5
10
V
DD
OUT2
IN2-
IN2+
9
8
7
6
OUT2
IN2-
SHDN2
B4
MAX4233
B1
IN1+
IN1+
V
DD
V
MAX4233
SS
V
11
V
DD
MAX44234
V
IN2+
SS
SS
IN2+
IN2-
10 IN3+
C4
SHDN1
SHDN2
C2
C3
C1
9
8
IN3-
IN1-
IN1+
OUT1
µMAX
SHDN1
OUT2
OUT3
UCSP
TSSOP/SO
Chip Information
Ordering Information (continued)
MAX4230 TRANSISTOR COUNT: 230
MAX4231 TRANSISTOR COUNT: 230
MAX4232 TRANSISTOR COUNT: 462
MAX4233 TRANSISTOR COUNT: 462
MAX4234 TRANSISTOR COUNT: 924
TOP
MARK
PIN-
PART
TEMP RANGE
PACKAGE
MAX4232AKA-T
MAX4232AUA
MAX4233AUB
MAX4233ABC-T
MAX4234AUD
MAX4234ASD
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
8 SOT23-8
8 µMAX
AAKW
—
10 µMAX
10 UCSP
14 TSSOP
14 SO
—
ABE
—
—
Power Supplies and Layout
The MAX4230–MAX4234 can operate from a single
2.7V to 5.5V supply, or from dual 1.35V to 2.5V sup-
plies. For single-supply operation, bypass the power
supply with a 0.1µF ceramic capacitor. For dual-supply
operation, bypass each supply to ground. Good layout
improves performance by decreasing the amount of
stray capacitance at the op amps’ inputs and outputs.
Decrease stray capacitance by placing external com-
ponents close to the op amps’ pins, minimizing trace
and lead lengths.
______________________________________________________________________________________ 13
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
14 ______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
______________________________________________________________________________________ 15
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
ÿ 0.50±0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6±0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
α
S
0.6±0.1
0.0207 BSC
0.5250 BSC
BOTTOM VIEW
D
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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