MAXIM MAX4233ABB-T

19-2164; Rev 0; 10/01
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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™, providing the smallest footprint area for a dual op amp with
shutdown.
These op amps are designed to be part of the PA control 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 disabled when needed, preventing unconverted signals to
the RF antenna.
Features
♦ 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
♦ 100dB Voltage Gain (RL = 100kΩ)
♦ 85dB Power-Supply Rejection Ratio
♦ No Phase Reversal for Overdriven Inputs
♦ Unity-Gain Stable for Capacitive Loads to 780pF
♦ 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 SC70
space-saving package. These parts are offered over
the automotive temperature range (-40°C to +125°C)
Ordering Information
TEMP.
RANGE
PART
Applications
TOP
MARK
PINPACKAGE
MAX4230AXK-T
-40°C to +125°C
5 SC70-5
ACS
RF PA Biasing Controls in Handset Applications
MAX4230AUK-T
-40°C to +125°C
5 SOT23-5
ABZZ
Portable/Battery-Powered Audio Applications
MAX4231AXT-T
-40°C to +125°C
6 SC70-6
ABA
MAX4231AUT-T
-40°C to +125°C
6 SOT23-6
Portable Headphone Speaker Drivers (32Ω)
Audio Hands-Free Car Phones (Kits)
AAUV
Ordering Information continued at end of data sheet.
Laptop/Notebook Computers/TFT Panels
Typical Operating Circuit
Sound Ports/Cards
Set-Top Boxes
ANTENNA
Digital-to-Analog Converter Buffers
Transformer/Line Drivers
Motor Drivers
2.7V TO 5.5V
PA
IOUT = 30mA
DAC
RISO
MAX4231
SHDN
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
CLOAD
C
R
RF
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4230–MAX4234
General Description
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
of 10MHz. The MAX4230–MAX4234 can drive typical
headset levels (32Ω), as well as bias an RF power
amplifier (PA) in wireless handset applications.
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to VSS)..................................................+6V
All Other Pins ....................................(VSS - 0.3V) + (VDD + 0.3V)
Output Short-Circuit Duration to VDD or VSS (Note 1) ..................1s
Continuous Power Dissipation (TA = +70°C)
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
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
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
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), V SHDN = VDD, TA = +25°C, unless otherwise
noted.) (Note 2)
PARAMETER
SYMBOL
Operating Supply Voltage Range
VDD
Input Offset Voltage
VOS
Input Bias Current
CONDITIONS
MIN
Inferred from PSRR test
TYP
2.7
0.85
MAX
UNITS
5.5
V
±3
mV
IB
VCM = VSS to VDD
50
pA
Input Offset Current
IOS
VCM = VSS to VDD
50
pA
Input Resistance
RIN
1000
MΩ
Common-Mode Input Voltage
Range
VCM
Inferred from CMRR test
VSS
VDD
Common-Mode Rejection Ratio
CMRR
VSS < VCM < VDD
55
Power-Supply Rejection Ratio
PSRR
VDD = +2.7V to +5.5V
75
Shutdown Output Impedance
ROUT
V SHDN = 0 (Note 3)
10
VOUT(SHDN) V SHDN = 0, RL = 200Ω (Note 3)
RL = 100kΩ
VSS + 0.20 < VOUT
AVOL
RL = 2kΩ
< VDD - 0.20V
RL = 200Ω
68
Output Voltage in Shutdown
Large-Signal Voltage Gain
RL = 32Ω
Output Voltage Swing
VOUT
RL = 200Ω
RL = 2kΩ
Output Source/Sink Current
2
dB
85
dB
Ω
120
85
98
74
80
VDD - VOH
400
500
360
500
VDD - VOH
80
120
VOL - VSS
70
120
VDD - VOH
8
14
VOL - VSS
7
14
VDD = +2.7V
VDD = +5V
mV
dB
VOL - VSS
Output Voltage with Current Load
IL = 30mA
70
100
VOUT = 0.15V to (VDD - 0.15V)
IL = 10mA
V
7
10
mA
VDD - VOH
128
200
VOL - VSS
112
175
VDD - VOH
240
320
VOL - VSS
224
300
_______________________________________________________________________________________
mV
mV
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), V SHDN = VDD, TA = +25°C, unless otherwise
noted.) (Note 2)
PARAMETER
SYMBOL
Quiescent Supply Current (per
Amplifier)
IDD
Shutdown Supply Current (per
Amplifier) (Note 3)
IDD(SHDN)
SHDN Logic Threshold
SHDN Input Bias Current
TYP
MAX
VDD = +5.5V, VCM = VDD / 2
CONDITIONS
1.2
2.3
VDD = +2.7V, VCM = VDD / 2
1.1
2.0
VDD = +5.5V
0.5
1
VDD = +2.7V
0.1
1
V SHDN = 0, RL = ∞
MIN
Shutdown mode (Note 3)
VSS + 0.3
Normal mode (Note 3)
VDD - 0.3
VSS < V S HDN < VDD (Note 3)
UNITS
mA
µA
V
50
pA
DC ELECTRICAL CHARACTERISTICS
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), V SHDN = VDD, TA = -40 to +125°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
Operating Supply Voltage
Range
VDD
Input Offset Voltage
CONDITIONS
MIN
Inferred from PSRR test
TYP
2.7
Common-Mode Input Voltage
Range
VCM
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Voltage in Shutdown
Large-Signal Voltage Gain
Inferred from CMRR test
50
PSRR
VDD = +2.7V to +5.5V
70
V SHDN < 0, RL = 200Ω (Note 3)
VSS + 0.2V < VDD - 0.2V
RL = 32Ω, TA = +85°C
Output Voltage Swing
VOUT
RL = 200Ω
RL = 2kΩ
Output Source/Sink Current
Output Voltage with Current
VSS
VSS < VCM < VDD
AVOL
V
80
RL = 200Ω
70
IL = 10mA
VDD = +2.7V
IL = 30mA,
TA = -40°C
VDD = +5V
mV
µV/°C
VDD
V
dB
dB
150
RL = 2kΩ
mV
dB
VDD - VOH
650
VOL - VSS
650
VDD - VOH
150
VOL - VSS
150
VDD - VOH
20
VOL - VSS
20
VOUT = 0.15V to (VDD - 0.15V)
Load
5.5
±3
CMRR
VOUT(SHDN)
UNITS
±5
VOS
∆VOS / ∆T
Offset Voltage Tempco
MAX
4
mV
mA
VDD - VOH
250
VOL - VSS
230
VDD - VOH
400
mV
_______________________________________________________________________________________
3
MAX4230–MAX4234
DC ELECTRICAL CHARACTERISTICS (continued)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), V SHDN = VDD, TA = -40 to +125°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
Quiescent Supply Current
(per Amplifier)
IDD
Shutdown Supply Current
(per Amplifier) (Note 3)
IDD(SHDN)
CONDITIONS
MIN
TYP
MAX
VDD = +5.5V, VCM = VDD / 2
2.8
VDD = +2.7V, VCM = VDD / 2
2.5
V SHDN < 0, RL = ∞
VDD = +5.5V
2.0
VDD = +2.7V
2.0
UNITS
mA
µA
AC ELECTRICAL CHARACTERISTICS
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), V SHDN = VDD, TA = +25°C, unless otherwise noted.)
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain-Bandwidth Product
GBWP
VCM = VDD / 2
10
MHz
Full-Power Bandwidth
FPBW
VOUT = 2Vp-p, VDD = +5V
0.8
MHz
Slew Rate
SR
10
V/µs
Phase Margin
PM
70
Degrees
Gain Margin
GM
15
dB
0.0005
%
8
pF
Total Harmonic Distortion Plus
Noise
Input Capacitance
Voltage Noise Density
THD+N
CIN
en
Channel-to-Channel Isolation
Capacitive Load Stability
Shutdown Time
Enable Time from Shutdown
Power-Up Time
f = 10kHz, VOUT = 2Vp-p, AVCL = +1V/V
f = 1kHz
15
f = 10kHz
12
f = 1kHz, RL = 100kΩ
125
dB
AVCL = +1V/V, no sustained oscillations
780
pF
tSHDN
(Note 3)
1
µs
tENABLE
(Note 3)
1
µs
5
µs
tON
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
nV/√Hz
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
GAIN AND PHASE vs. FREQUENCY
(CL = 250pF)
MAX4230 toc01
90
90
50
60
50
60
30
40
30
30
0
20
-30
10
-60
GAIN (dB)
60
60
PHASE (Degrees)
70
40
GAIN (dB)
MAX4230 toc02
120
70
30
0
20
-30
10
-60
-90
-120
-10
-150
-20
AV = +1000V/V
-30
0.01k 0.1k
1k
10k
100k
1M
-90
0
0
-10
-20
-30
0.01k 0.1k
-180
10M 100M
1k
-150
10k
100k
1M
-180
10M 100M
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT IMPEDANCE vs. FREQUENCY
-10
OUTPUT IMPEDANCE (Ω)
-20
-30
-40
-50
-60
-70
-80
MAX4230 toc04
1000
MAX4230 toc03
0
100
10
1
0.1
AV = +1V/V
-90
-100
0.01k
AV = +1V/V
0.01
0.1k
1k
10k
100k
1M
10M
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
(SHDN = LOW)
110
MAX4230 toc05
2.0
1.8
100
SUPPLY CURRENT (nA)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
MAX4230 toc06
PSRR (dB)
-120
AV = +1000V/V
CL = 250pF
FREQUENCY (Hz)
SUPPLY CURRENT (mA)
120
PHASE (Degrees)
GAIN AND PHASE vs. FREQUENCY
90
80
70
60
SHDN = VSS
0.2
50
0
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
100 120
-40 -20
0
20
40
60
80
100 120
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX4230–MAX4234
__________________________________________Typical Operating Characteristics
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, V SHDN = VDD. TA = +25°C, unless otherwise noted.)
____________________________Typical Operating Characteristics (continued)
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, V SHDN = VDD. TA = +25°C, unless otherwise noted.)
1.8
1.6
MAX4230 toc08
2
MAX4230 toc07
2.0
VDD = +2.7V
1.0
80
VDD - VOUT (mV)
1.2
VDD = +5.0V
0
0.8
0.6
VDD = +5.0V
RL = 200Ω
100
1
1.4
VOS (mV)
SUPPLY CURRENT (mA)
OUTPUT SWING HIGH
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4230/34 toc09
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
VDD = +2.7V
RL = 200Ω
60
40
-1
0.4
20
0.2
0
-2
3.0
3.5
4.0
4.5
5.0
20
40
60
80
100 120
-40 -20
20
40
60
100 120
80
OUTPUT SWING LOW
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
80
60
VDD = +2.7V
RL = 200Ω
40
1.2
0.5
1.0
0
-0.5
-1.0
0
20
40
60
80
0
100 120
0.6
VDD = +2.7V
0.2
-2.0
0
0.8
0.4
-1.5
20
MAX4230/3 toc12
1.0
SUPPLY CURRENT (mA)
MAX4230/3 toc10
VDD = +5.0V
RL = 200Ω
-40 -20
0
TEMPERATURE (°C)
0.5
1.5
1.0
2.0
0
2.5
0.5
1.5
1.0
2.0
2.5
COMMON-MODE VOLTAGE (V)
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
MAX4230/34 toc13
1.4
1.2
VOUT = 2Vp-p
500kHz LOWPASS FILTER
0.40
10
0.35
f = 10kHz
VDD = +5V
0.8
0.6
VDD = +5.0V
0.4
0.30
THD + NOISE (%)
THD + NOISE (%)
1
1.0
0.25
0.20
0.15
RL = 32Ω
0.10
RL = 25Ω
RL = 2kΩ
RL = 100kΩ
MAX4230/34 toc15
TEMPERATURE (°C)
MAX4230/34 toc14
VOUT - VSS (mV)
0
TEMPERATURE (°C)
100
RL = 250Ω
0.1
0.001
0.05
RL = 10kΩ
0
0.2
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)
6
-20
SUPPLY VOLTAGE (V)
140
120
0
-40
5.5
MAX4230/3 toc11
2.5
INPUT OFFSET VOLTAGE (mV)
2.0
SUPPLY CURRENT (mA)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
10
100
1k
FREQUENCY (Hz)
10k
100k
0.0001
4.0
4.2
4.4
4.6
PEAK-TO-PEAK (V)
_______________________________________________________________________________________
4.8
5.0
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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
50mV/div
50mV/div
1V/div
OUT
OUT
OUT
1V/div
OUT
60
50
40
30
-50
-70
-80
50
OUTPUT VOLTAGE (V)
4.5
5.0
0.6
0.8
1.0
1.2
INPUT VOLTAGE NOISE
vs. FREQUENCY
VDIFF = 100mV
MAX4230/34 toc23
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = +5.0V)
-100
-150
-250
4.0
0.4
OUTPUT VOLTAGE (V)
-200
0
0.2
0
0.5
1.0
1.5
2.0
OUTPUT VOLTAGE (V)
2.5
3.0
1.4
1.6
200
100
INPUT VOLTAGE NOISE (nV/√Hz)
100
0
OUTPUT VOLTAGE (V)
-50
OUTPUT CURRENT (mA)
150
3.5
-40
10
0
MAX4230/34 toc22
200
3.0
-30
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VDIFF = 100mV
2.5
-20
-60
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = +5.0V)
2.0
VDIFF = 100mV
-10
20
0
400ns/div
MAX4230/34 toc21
OUTPUT CURRNET (mA)
70
0
OUTPUT CURRENT (mA)
IN
VDIFF = 100mV
MAX4230/34 toc20
80
250
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = +2.7V)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = +2.7V)
MAX4230/34 toc19
MAX4230/34 toc24
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
OUTPUT CURRENT (mA)
400ns/div
400ns/div
400ns/div
10
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
7
MAX4230–MAX4234
____________________________Typical Operating Characteristics (continued)
(VDD = +2.7V, VSS = 0, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, V SHDN = VDD. TA = +25°C, unless otherwise noted.)
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
MAX4230–MAX4234
Pin Description
PIN
FUNCTION
MAX4231
MAX4232
MAX4233
MAX4234
1
1
—
—
—
IN+
Noninverting Input
2
2
4
4
4
VSS
Negative Supply Input. Connect to ground
for single-supply operation.
3
3
—
—
—
IN-
Inverting Input
4
4
—
—
—
OUT
Amplifier Output
5
6
8
10
11
VDD
Positive Supply Input
—
5
—
5, 6
—
SHDN1,
SHDN2
—
—
3
3
3
IN1+
Noninverting Input to Amplifier 1
—
—
2
2
2
IN1-
Inverting Input to Amplifier 1
—
—
1
1
1
OUT1
Amplifier 1 Output
—
—
5
7
5
IN2+
Noninverting Input to Amplifier 2
—
—
6
8
6
IN2-
Inverting Input to Amplifier 2
—
—
7
9
7
OUT2
Amplifier 2 Output
Noninverting Input to Amplifiers 3 and 4
Shutdown Control. Tie to high for normal
operation.
—
—
—
—
10, 12
IN3+,
IN4+
—
—
—
—
9, 13
IN3-, IN4-
8, 14
OUT3,
OUT4
—
—
—
—
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 typically greater than (V SS + 1.2V), and the P-channel
stage is active for common-mode input voltages typically less than (VDD - 1.2V).
Applications Information
Package Power Dissipation
Warning: Due to the high output current drive, this op
amp can exceed the absolute maximum power-dissipation rating. As a general rule, as long as the peak current is less than or equal to 40mA, the maximum package
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-
8
NAME
MAX4230
Inverting Input to Amplifiers 3 and 4
Amplifiers 3 and 4 Outputs
lowing equations. The equation below gives an approximation of the package power dissipation:
PIC(DISS) ≅ VRMS IRMS COS θ
where:
VRMS = RMS voltage from VDD to VOUT when sourcing
current and RMS voltage from VOUT to VSS when sinking current.
IRMS = RMS current flowing out of or into the op amp
and the load.
θ = phase difference between the voltage and the current. For resistive loads, COS θ = 1.
For example, the circuit in Figure 1 has a package
power dissipation of 196mW:
_______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
MAX4230–MAX4234
RF
3.6V
CIN
RIN
LEFT
AUDIO INPUT
R
COUT
HEADPHONE JACK
TO 32Ω STEREO
HEADSET
C
VIN = 2Vp-p
VBIAS
R
MAX4230
MAX4230
MAX4231
CIN
32Ω
RIN
RIGHT
AUDIO INPUT
COUT
RF
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
(
)
RMS ≅ VDD − VDC +
VPEAK
= 3.6V − 1.8V +
2
1.0V
= 2.507VRMS
2
I
1.8V
1.0V / 32Ω
IRMS ≅ IDC + PEAK =
+
32Ω
2
2
= 78.4mARMS
where:
VDC = the DC component of the output voltage.
IDC = the DC component of the output current.
VPEAK = the highest positive excursion of the AC component of the output voltage.
IPEAK = the highest positive excursion of the AC component of the output current.
Therefore:
PIC(DISS) = VRMS IRMS COS θ
= 196mW
Adding a coupling capacitor improves the package
power dissipation because there is no DC current to
the load, as shown in Figure 2:
Figure 2. Circuit Example: Adding a Coupling Capacitor
Greatly Reduces Power Dissipation of its Package
VRMS ≅
=
VPEAK
2
1.0V
2
= 0.707VRMS
I
IRMS ≅ IDC + PEAK
2
= 22.1mARMS
= 0A +
1.0V / 32Ω
2
Therefore:
PIC(DISS) = VRMS IRMS COS θ
= 15.6mW
If the configuration in Figure 1 were used with all four of
the MAX4234 amplifiers, the absolute maximum powerdissipation rating of this package would be exceeded
(see the Absolute Maximum Ratings section).
60mW Single-Supply Stereo
Headphone Driver
Two MAX4230/MAX4231s can be used as a single-supply, stereo headphone driver. The circuit shown in
Figure 2 can deliver 60mW per channel with 1% distortion from a single +5V supply.
The input capacitor (CIN), in conjunction with RIN forms
a highpass filter that removes the DC bias from the
incoming signal. The -3dB point of the highpass filter is
given by:
f −3dB =
1
2πRINCIN
_______________________________________________________________________________________
9
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
C1
0.1µF
R1
16kΩ
R2
82kΩ
0.5Vp-p
1/2
+3V
+3V
2
R5
51kΩ
C2
0.1µF
VCC = +3.0V
RL = 100kΩ
3
IN
(1V/div)
MAX4232
1
8
4
32Ω
fs = 100Hz
R4
10kΩ
R3
10kΩ
OUT
(1V/div)
6
R6
51kΩ
7
5
1/2
MAX4232
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
Choose gain setting resistors RIN and RF according to
the amount of desired gain, keeping in mind the maximum output amplitude. The output coupling capacitor,
COUT, blocks the DC component of the amplifier output, preventing DC current flowing to the load. The output capacitor and the load impedance form a highpass
filer with the -3dB point determined by:
f −3dB =
1
2πRLCOUT
For a 32Ω load, a 100µF aluminum electrolytic capacitor gives a low-frequency pole at 50Hz.
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 eliminates the need for the large coupling capacitor
required by the single op amp speaker driver when single-supply operation is necessary. Voltage gain is set
to +10V/V; however, it can be changed by adjusting the
82kΩ resistor value.
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 typically greater than (V SS + 1.2V), and the P-channel
stage is active for common-mode input voltages typically less than (VDD - 1.2V).
10
TIME (5µs/div)
Figure 4. Rail-to-Rail Input/Output Range
Rail-to-Rail Output Stage
The minimum output is within millivolts of ground for single-supply operation, where the load is referenced to
ground (VSS). Figure 4 shows the input voltage range
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 (VDD = +2.7V) even
with maximum load (32Ω to ground).
The MAX4230–MAX4234 incorporate a smart short-circuit protection feature. When VOUT is shorted to VDD or
VSS, the device detects a fault condition and limits the
output current, therefore protecting the device and the
application circuit. If VOUT is shorted to any voltage
other than VDD or VSS, the smart short-circuit protection
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 CIN (typically 5pF). This introduces a
pole at frequency (2πR′CIN)-1, where R′ is the parallel
combination 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 oscillations. The pole frequency is
10MHz when R′ = 2kΩ. To maximize stability, R′ << 2kΩ
is recommended.
______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
R
VOUT
MAX4230
R′ = R || Rf
RfCf = RCIN
CAPACITIVE LOAD (pF)
2000
Rf
VIN
MAX4230–MAX4234
2500
Cf
INVERTING
UNSTABLE
1500
STABLE
1000
500
VDD = +5.0V
RL TO VDD/2
0
1
10
100
1000
10,000 100,000
RESISTIVE LOAD (Ω)
NONINVERTING
VIN
Figure 6. Capacitive Load Stability
VOUT
MAX4230
Rf
Cf
R
20mV/div
R′ = R || Rf
RfCf = RCIN
20mV/div
VDD = +3.0V, CL = 1500pF
RL = 100kΩ, RISO = 0
Figure 5. Inverting and Noninverting Amplifier with Feedback
Compensation
To improve step response when R′ > 2kΩ, connect a
small capacitor Cf between the inverting input and output. Choose Cf as follows:
1µs/div
Figure 7. Small-Signal Transient Response with Excessive
Capacitive Load
Cf = 8(R / Rf) [pf]
where Rf is the feedback resistor and R is the gain-setting resistor (Figure 5).
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 capacitive-load-driving circuit in the unity-gain configuration.
The resistor improves the circuit’s phase margin by isolating the load capacitor from the op amp’s output.
20mV/div
20mV/div
VDD = +3.0V, CL = 1500pF
RL = 100kΩ, RISO = 39Ω
1µs/div
Figure 8. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
______________________________________________________________________________________
11
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
SHDN
2V/div
IDD
1mA/div
RISO
CL
OUT
2V/div
100µs/div
Figure 9. Capacitive-Load-Driving Circuit
1V/div
Figure 11. Shutdown Enable/Disable Supply Current
VDD
2V/div
IDD
1mA/div
1V/div
4µs/div
Figure 10. Shutdown Output Voltage Enable/Disable
40µs/div
Figure 12. Power-Up/Down Supply Current
Selector Guide
Power-Up and Shutdown Modes
The MAX4231/MAX4233 have a shutdown option.
When the shutdown pin (SHDN) is pulled low, supply
current drops to 0.5µA per amplifier (VDD = +2.7V), the
amplifiers are disabled, and their outputs are driven to
VSS. Since the outputs are actively driven to VSS in
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
power-up. Figures 11 and 12 show IDD to a shutdown
plus and voltage power-up cycle.
PART
AMPS PER
PACKAGE
MAX4230
Single
—
MAX4231
Single
Yes
MAX4232
Dual
—
MAX4233
Dual
Yes
MAX4234
Quad
—
When exiting shutdown, there is a 6µs delay before the
amplifier’s output becomes active (Figure 10).
12
______________________________________________________________________________________
SHUTDOWN
MODE
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
TOP VIEW
IN+ 1
5
VDD
IN- 3
6
VDD
VSS 2
5
SHDN
IN- 3
4
OUT
4
OUT
SOT23/SC70
A1
A2
A3
OUTB
INB-
INB+
VDD
C1
OUTA
MAX4233
C2
INA-
C3
8
VDD
7
OUT2
IN1+ 3
6
IN2-
VSS 4
5
IN2+
MAX4232
SOT23/µMAX
A4
10 VDD
OUT1 1
IN1-
2
IN1+
3
MAX4233
IN1- 2
IN2-
IN1+ 3
VSS 4
7
IN2+
C4
SHDN1
5
6
SHDN2
UCSP
13 IN4-
OUT2
4
µMAX
14 OUT4
8
VSS
INA+
OUT1 1
9
VSS
SHDNA
12 IN4+
MAX44234
11 VDD
IN2+ 5
10 IN3+
IN2- 6
9
IN3-
OUT2 7
8
OUT3
TSSOP/SO
Ordering Information (continued)
TEMP. RANGE
PINPACKAGE
TOP
MARK
MAX4232AKA-T*
-40°C to +125°C
8 SOT23-8
—
MAX4232AUA*
-40°C to +125°C
8 µMAX
—
MAX4233AUB
-40°C to +125°C
10 µMAX
—
MAX4233ABB-T*
-40°C to +125°C
10 UCSP
—
MAX4234AUD*
-40°C to +125°C
14 TSSOP
—
MAX4234ASD*
-40°C to +125°C
14 SO
—
PART
OUT1 1
SC70/SOT23
SHDNB
B4
B1
MAX4231
IN1- 2
MAX4230
VSS 2
IN+ 1
Chip Information
MAX4230 TRANSISTOR COUNT: 230
MAX4231 TRANSISTOR COUNT: 230
MAX4232 TRANSISTOR COUNT: 462
MAX4233 TRANSISTOR COUNT: 462
MAX4234 TRANSISTOR COUNT: 924
*Future product—contact factory for availablility.
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
supplies. For single-supply operation, bypass the
power supply with a 0.1µF ceramic capacitor. For dualsupply 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 components close to the op amps’ pins, minimizing
trace and lead lengths.
______________________________________________________________________________________
13
MAX4230–MAX4234
Pin Configurations
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
SC70, 6L.EPS
SC70, 5L.EPS
Package Information
14
______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
SOT5L.EPS
6LSOT.EPS
______________________________________________________________________________________
15
MAX4230–MAX4234
Package Information (continued)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
8LUMAXD.EPS
Package Information (continued)
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
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.