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19-2164; Rev 4; 5/04
High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70
General Description
The MAX4230-MAX4234 single/dual/quad, high-outputdrive 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/s and a gain-bandwidth product (GBWP) of 10MHz. The MAX4230-MAX4234 can drive typical headset levels (32), as well as bias an RF power amplifier (PA) in wireless handset applications. 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 UCSPTM, 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. The MAX4230 family offers low offsets, wide bandwidth, and high-output drive in a tiny 2.1mm x 2.0mm spacesaving SC70 package. These parts are offered over the automotive temperature range (-40C to +125C). o 30mA Output Drive Capability o Rail-to-Rail Input and Output o 1.1mA Supply Current per Amplifier o 2.7V to 5.5V Single-Supply Operation o 10MHz Gain-Bandwidth Product o High Slew Rate: 10V/s o 100dB Voltage Gain (RL = 100k) o 85dB Power-Supply Rejection Ratio o No Phase Reversal for Overdriven Inputs o Unity-Gain Stable for Capacitive Loads to 780pF o Low-Power Shutdown Mode Reduces Supply Current to <1A o Available in 5-Pin SC70 Package (MAX4230) o Available in 10-Bump UCSP Package (MAX4233)
Features
MAX4230-MAX4234
Ordering Information
PART MAX4230AXK-T MAX4230AUK-T MAX4231AXT-T MAX4231AUT-T TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 5 SC70-5 5 SOT23-5 6 SC70-6 6 SOT23-6 TOP MARK ACS ABZZ ABA AAUV
Applications
RF PA Biasing Controls in Handset Applications Portable/Battery-Powered Audio Applications Portable Headphone Speaker Drivers (32) Audio Hands-Free Car Phones (Kits) Laptop/Notebook Computers/TFT Panels Sound Ports/Cards Set-Top Boxes
Ordering Information continued at end of data sheet.
Typical Operating Circuit
ANTENNA
Digital-to-Analog Converter Buffers Transformer/Line Drivers Motor Drivers
DAC RISO 2.7V TO 5.5V PA IOUT = 30mA
MAX4231
SHDN CLOAD
Selector Guide appears at end of data sheet. Pin Configurations appear at end of data sheet.
R RF
C
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/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
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 = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............247mW 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW 6-Pin SOT23 (derate 8.7mW/C above +70C) ...........696mW 8-Pin SOT23 (derate 8.9mW/C above +70C) ...........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.
8-Pin MAX (derate 4.5mW/C above +70C) ............362mW 10-Pin MAX (derate 5.6mW/C above +70C) ..........444mW 10-Bump UCSP (derate 6.1mW/C above +70C) .....484mW 14-Pin TSSOP (derate 9.1mW/C above +70C) ........727mW 14-Pin SO (derate 8.3mW/C above +70C) ...............667mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
DC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = connected to (VDD/2), V SHDN = VDD, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Operating Supply Voltage Range Input Offset Voltage Input Bias Current Input Offset Current Input Resistance Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Shutdown Output Impedance Output Voltage in Shutdown Large-Signal Voltage Gain SYMBOL VDD VOS IB IOS RIN VCM CMRR PSRR ROUT Inferred from CMRR test VSS < VCM < VDD VDD = 2.7V to 5.5V V SHDN = 0V (Note 3) RL = 100k RL = 2k RL = 200 VDD - VOH VOL - VSS VDD - VOH VOL - VSS VDD - VOH VOL - VSS 7 VDD - VOH VOL - VSS VDD - VOH VOL - VSS 85 74 VSS 52 73 70 85 10 68 100 98 80 400 360 80 70 8 7 10 128 112 240 224 200 175 320 300 mV 500 500 120 120 14 14 mA mV dB 120 VCM = VSS to VDD VCM = VSS to VDD CONDITIONS Inferred from PSRR test MIN 2.7 0.85 50 50 1000 VDD TYP MAX 5.5 6 UNITS V mV pA pA M V dB dB mV
VOUT(SHDN) V SHDN = 0V, RL = 200 (Note 3) AVOL VSS + 0.20 < VOUT < VDD - 0.20V RL = 32
Output Voltage Swing
VOUT
RL = 200 RL = 2k
Output Source/Sink Current
VOUT = 0.15V to (VDD - 0.15V) IL = 10mA VDD = 2.7V VDD = 5V
Output Voltage with Current Load IL = 30mA
2
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = connected to (VDD/2), V SHDN = VDD, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Quiescent Supply Current (per Amplifier) Shutdown Supply Current (per Amplifier) (Note 3) SHDN Logic Threshold SHDN Input Bias Current SYMBOL IDD IDD(SHDN) CONDITIONS VDD = 5.5V, VCM = VDD / 2 VDD = 2.7V, VCM = VDD / 2 V SHDN = 0V, RL = Shutdown mode (Note 3) Normal mode (Note 3) VSS < V S HDN < VDD (Note 3) VDD = 5.5V VDD = 2.7V MIN TYP 1.2 1.1 0.5 0.1 VSS + 0.3 VDD - 0.3 50 MAX 2.3 2.0 1 1 UNITS mA A V pA
MAX4230-MAX4234
DC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = connected to (VDD/2), V SHDN = VDD, TA = -40 to +125C, unless otherwise noted.) (Note 2)
PARAMETER Operating Supply Voltage Range Input Offset Voltage Offset Voltage Tempco Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output Voltage in Shutdown Large-Signal Voltage Gain SYMBOL VDD VOS VOS /T VCM CMRR PSRR VOUT(SHDN) AVOL Inferred from CMRR test VSS < VCM < VDD VDD = 2.7V to 5.5V V SHDN < 0V, RL = 200 (Note 3) VSS + 0.2V < VDD - 0.2V RL = 32, TA = +85C Output Voltage Swing VOUT RL = 200 RL = 2k Output Source/Sink Current RL = 2k RL = 200 VDD - VOH VOL - VSS VDD - VOH VOL - VSS VDD - VOH VOL - VSS 4 250 230 400 370 mV VDD - VOH VOL - VSS VDD - VOH VDD = 5V VOL - VSS 76 67 650 650 150 150 20 20 mA mV VSS 46 70 150 3 VDD CONDITIONS Inferred from PSRR test MIN 2.7 TYP MAX 5.5 8 UNITS V mV V/C V dB dB mV dB
VOUT = 0.15V to (VDD - 0.15V) IL = 10mA VDD = 2.7V
Output Voltage with Current Load
IL = 30mA, TA = -40C to +85C
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = connected to (VDD/2), V SHDN = VDD, TA = -40 to +125C, unless otherwise noted.) (Note 2)
Quiescent Supply Current (per Amplifier) Shutdown Supply Current (per Amplifier) (Note 3) IDD IDD(SHDN) VDD = 5.5V, VCM = VDD/2 VDD = 2.7V, VCM = VDD/2 V SHDN < 0V, RL = VDD = 5.5V VDD = 2.7V 2.8 2.5 2.0 2.0 mA A
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = connected to (VDD/2), V SHDN = VDD, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Gain-Bandwidth Product Full-Power Bandwidth Slew Rate Phase Margin Gain Margin Total Harmonic Distortion Plus Noise Input Capacitance Voltage Noise Density Channel-to-Channel Isolation Capacitive-Load Stability Shutdown Time Enable Time from Shutdown Power-Up Time tSHDN tENABLE tON SYMBOL GBWP FPBW SR PM GM THD+N CIN en f = 1kHz f = 10kHz f = 1kHz, RL = 100k AVCL = 1V/V, no sustained oscillations (Note 3) (Note 3) f = 10kHz, VOUT = 2VP-P, AVCL = 1V/V VCM = VDD/2 VOUT = 2VP-P, VDD = 5V CONDITIONS MIN TYP 10 0.8 10 70 15 0.0005 8 15 12 125 780 1 1 5 MAX UNITS MHz MHz V/s Degrees dB % pF nV/Hz dB pF s s s
Note 2: All units 100% tested at +25C. All temperature limits are guaranteed by design. Note 3: SHDN logic parameters are for MAX4231/MAX4233 only.
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70
__________________________________________Typical Operating Characteristics
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = , connected to VDD/2, V SHDN = VDD, TA = +25C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY (CL = 250pF)
120 90 60 PHASE (DEGREES) 30 0 -30 -60 -90 -120 AV = 1000V/V 1k 10k 100k 1M -150 -180 10M 100M 70 60 50 40 GAIN (dB) 30 20 10 0 -10 -20 AV = 1000V/V CL = 250pF 1k 10k 100k 1M
MAX4230-MAX4234
GAIN AND PHASE vs. FREQUENCY
70 60 50 40 GAIN (dB) 30 20 10 0 -10 -20
MAX4230 toc01
MAX4230 toc02
120 90 60 PHASE (DEGREES) 30 0 -30 -60 -90 -120 -150
-30 0.01k 0.1k
-30 0.01k 0.1k
-180 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 0.01k 0.1k 1k 10k 100k AV = 1V/V 0.01 1M 10M
MAX4230 toc03
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4230 toc04
0
1000
OUTPUT IMPEDANCE ()
100
10
1
0.1 AV = 1V/V 1k 10k 100k FREQUENCY (Hz) 1M 10M
FREQUENCY (Hz)
SUPPLY CURRENT vs. TEMPERATURE
1.8 1.6 SUPPLY CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 50
MAX4230 toc05
SUPPLY CURRENT vs. TEMPERATURE (SHDN = LOW)
MAX4230 toc06
2.0
110 100 SUPPLY CURRENT (nA) 90 80 70 60
SHDN = VSS -40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
____________________________Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = , connected to VDD/2, V SHDN = VDD, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT PER AMPLIFIER vs. SUPPLY VOLTAGE
MAX4230 toc07
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4230 toc08
OUTPUT SWING HIGH vs. TEMPERATURE
100 80 VDD - VOUT (mV) 60 40 20 VDD = 5.0V RL = 200 VDD = 2.7V RL = 200
MAX4230/34 toc09
2.0 1.8 1.6 SUPPLY CURRENT (mA) 1.4
2 VDD = 2.7V 1 VOS (mV)
1.2 1.0 0.8 0.6 0.4 0.2 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
0
VDD = 5.0V
-1
-2 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
OUTPUT SWING LOW vs. TEMPERATURE
MAX4230/3 toc10
INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE
MAX4230/3 toc11
SUPPLY CURRENT PER AMPLIFIER vs. COMMON-MODE VOLTAGE
MAX4230/3 toc12
140 120 100 VOUT - VSS (mV) 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) VDD = 2.7V RL = 200 VDD = 5.0V RL = 200
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 0 0.5 1.0 1.5 2.0 2.5 COMMON-MODE VOLTAGE (V)
1.2
INPUT OFFSET VOLTAGE (mV)
1.0 SUPPLY CURRENT (mA)
0.8
0.6
0.4
VDD = 2.7V
0.2 0 0.5 1.0 1.5 2.0 2.5 COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER vs. COMMON-MODE VOLTAGE
MAX4230/34 toc13
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4230/34 toc14
TOTAL HARMONIC DISTORTION PLUS NOISE vs. PEAK-TO-PEAK OUTPUT VOLTAGE
f = 10kHz VDD = 5V 1 RL = 100k
MAX4230/34 toc15
1.4 1.2 SUPPLY CURRENT (mA) 1.0
0.45 0.40 0.35 0.30 THD+N (%) 0.25 0.20 0.15
VOUT = 2VP-P 500kHz LOWPASS FILTER
10 RL = 2k RL = 250
RL = 25 THD+N (%) RL = 32 RL = 10k 10 100 1k FREQUENCY (Hz) 10k 100k
0.8 0.6 VDD = 5.0V 0.4 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)
0.1
0.10 0.05 0
0.001 0.0001 4.0 4.2 4.4 4.6 4.8 5.0 PEAK-TO-PEAK (V)
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
____________________________Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = , connected to VDD/2, V SHDN = VDD, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4230/34 toc16
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4230/34 toc17
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4230/34 toc18
IN
IN
IN
50mV/div OUT
50mV/div OUT
1V/div OUT
400ns/div
400ns/div
400ns/div
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4230/34 toc19
OUTPUT CURRENT vs. OUTPUT VOLTAGE (SOURCING, VDD = 2.7V)
MAX4230/34 toc20
OUTPUT CURRENT vs. OUTPUT VOLTAGE (SINKING, VDD = 2.7V)
VDIFF = 100mV -10 OUTPUT CURRENT (mA) -20 -30 -40 -50 -60 -70 -80
MAX4230/34 toc21
80 IN OUTPUT CURRENT (mA) 70 60 50 40 30 20 10 400ns/div 0
0
VDIFF = 100mV
1V/div
OUT
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 (SOURCING, VDD = 5.0V)
MAX4230/34 toc22
OUTPUT CURRENT vs. OUTPUT VOLTAGE (SINKING, VDD = 5.0V)
VDIFF = 100mV
MAX4230/34 toc23
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX4230/34 toc24
250
VDIFF = 100mV
0
200 100 INPUT VOLTAGE NOISE (nV/Hz) 10 100
200 OUTPUT CURRENT (mA)
-50 OUTPUT CURRENT (mA)
150
-100
100
-150
50
-200
0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V)
-250 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
1k
10k
100k
FREQUENCY (Hz)
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
Pin Description
PIN MAX4230 SOT23/ SC70 1 2 3 4 5 -- -- -- -- -- -- -- -- -- -- MAX4231 SOT23/ SC70 1 2 3 4 6 5 -- -- -- -- -- -- -- -- -- MAX4232 SOT23/ MAX -- 4 -- -- 8 -- 3 2 1 5 6 7 -- -- -- MAX4233 MAX -- 4 -- -- 10 5, 6 3 2 1 7 8 9 -- -- -- MAX4233 UCSP -- B4 -- -- B1 C4, A4 C3 C2 C1 A3 A2 A1 -- -- -- MAX4234 TSSOP/ SO -- 11 -- -- 4 -- 3 2 1 5 6 7 10, 12 9, 13 8, 14 NAME FUNCTION
IN+ VSS INOUT VDD SHDN, SHDN1, SHDN2 IN1+ IN1OUT1 IN2+ IN2OUT2 IN3+, IN4+ IN3-, IN4OUT3, OUT4
Noninverting Input Negative Supply Input. Connect to ground for single-supply operation. Inverting Input Amplifier Output Positive Supply Input Shutdown Control. Tie to high for normal operation. Noninverting Input to Amplifier 1 Inverting Input to Amplifier 1 Amplifier 1 Output Noninverting Input to Amplifier 2 Inverting Input to Amplifier 2 Amplifier 2 Output Noninverting Input to Amplifiers 3 and 4 Inverting Input to Amplifiers 3 and 4 Amplifiers 3 and 4 Outputs
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).
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 following equations. The equation below gives an approximation of the package power dissipation: PIC(DISS) VRMS IRMS COS 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. = phase difference between the voltage and the current. For resistive loads, COS = 1.
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
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
3.6V CIN R C VIN = 2VP-P R
MAX4230 MAX4231
RF RIN COUT HEADPHONE JACK TO 32 STEREO HEADSET VBIAS
LEFT AUDIO INPUT
MAX4230
32
CIN RIGHT AUDIO INPUT
RIN COUT
RF
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:
RMS VDD - VDC +
VRMS =
VPEAK 2 1.0V 2 = 0.707VRMS = 0A + 1.0V / 32 2
(
)
VPEAK 2 1.0V
= 2.507VRMS 2 I 1.8V 1.0V / 32 IRMS IDC + PEAK = + 32 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 = 196mW Adding a coupling capacitor improves the package power dissipation because there is no DC current to the load, as shown in Figure 2:
= 3.6V - 1.8V +
I IRMS IDC + PEAK 2 = 22.1mARMS Therefore:
PIC(DISS) = VRMS IRMS COS = 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 2RINCIN
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
C1 0.1F 0.5VP-P 3V 3V 2 R5 51k 3 8 MAX4232 1 4 R3 10k 6 7 5 1/2 MAX4232 R4 10k 32 fs = 100Hz R1 16k R2 82k 1/2
VCC = 3.0V RL = 100k IN (1V/div)
C2 0.1F
R6 51k
OUT (1V/div)
5s/div
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW at 3V
Figure 4. Rail-to-Rail Input/Output Range
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 2RLCOUT
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 (32 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.)
For a 32 load, a 100F 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 82k resistor value.
Input Capacitance
One consequence of the parallel-connected differential input stages for rail-to-rail operation is a relatively large input capacitance CIN (5pF typ). This introduces a pole at frequency (2RCIN)-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 = 2k. To maximize stability, R << 2k is recommended.
Rail-to-Rail Input Stage
The MAX4230-MAX4234 CMOS op amps have parallelconnected 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).
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
INVERTING Cf
2500
VIN
R VOUT MAX4230 R = R || Rf RfCf = RCIN
CAPACITIVE LOAD (pF)
Rf
2000
UNSTABLE
1500 STABLE 1000
500 VDD = 5.0V RL TO VDD/2 1 10 100 1k 10k 100k
0
NONINVERTING VIN VOUT MAX4230
RESISTIVE LOAD ()
Figure 6. Capacitive-Load Stability
Rf Cf
20mV/div
R
R = R || Rf RfCf = RCIN
20mV/div
Figure 5. Inverting and Noninverting Amplifiers with Feedback Compensation
VDD = 3.0V, CL = 1500pF RL = 100k, RISO = 0 1s/div
Figure 7. Small-Signal Transient Response with Excessive Capacitive Load
To improve step response when R > 2k, connect small capacitor Cf between the inverting input and output. Choose Cf as follows: Cf = 8(R / Rf) [pf] where Rf is the feedback resistor and R is the gain-setting resistor (Figure 5).
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 capacitive-load-driving circuit in the unity-gain configuration.
20mV/div VDD = 3.0V, CL = 1500pF RL = 100k, RISO = 39 1s/div
Figure 8. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor 11
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High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
SHDN 2V/div
RISO
IDD 1mA/div
CL
OUT 2V/div
100s/div
Figure 9. Capacitive-Load-Driving Circuit
Figure 11. Shutdown Enable/Disable Supply Current
1V/div
VDD 2V/div
1V/div
IDD 1mA/div
4s/div
40s/div
Figure 10. Shutdown Output Voltage Enable/Disable
Figure 12. Power-Up/Down Supply Current
The resistor improves the circuit's phase margin by isolating the load capacitor from the op amp's output.
Selector Guide
PART MAX4230 MAX4231 MAX4232 MAX4233 MAX4234 AMPS PER PACKAGE Single Single Dual Dual Quad SHUTDOWN MODE -- Yes -- Yes --
Power-Up and Shutdown Modes
The MAX4231/MAX4233 have a shutdown option. When the shutdown pin (SHDN) is pulled low, supply current drops to 0.5A 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 5s after power-up. Figures 11 and 12 show IDD to a shutdown plus and voltage power-up cycle.
When exiting shutdown, there is a 6s delay before the amplifier's output becomes active (Figure 10).
12
______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
Pin Configurations
TOP VIEW
IN+ 1 5 VDD IN+ 1 MAX4231 6 VDD OUT1 1 IN1- 2 VSS 2 5 SHDN 8 7 VDD OUT2 IN2IN2+
VSS 2
MAX4230
MAX4232
IN1+ 3 VSS 4 6 5
IN- 3
4
OUT
IN- 3
4
OUT
SOT23/SC70
SC70/SOT23
SOT23/MAX
A1 OUT2 B1 VDD C1 OUT1
A2 IN2-
A3 IN2+
A4 OUT1 1 SHDN2 B4 IN1IN1+ VSS SHDN1 2 3 4 5 10 VDD 9 OUT2 IN2IN2+ SHDN2 OUT1 1 IN1- 2 IN1+ 3 VDD 4 IN2+ 5 IN2- 6 OUT2 7 14 OUT4 13 IN412 IN4+
MAX4233
8 7 6
MAX4233
C2 IN1C3 IN1+
VSS C4
MAX4234
11 VSS 10 IN3+ 9 8 IN3OUT3
SHDN1
MAX
UCSP
TSSOP/SO
Ordering Information (continued)
PART MAX4232AKA-T MAX4232AUA MAX4233AUB MAX4233ABC-T MAX4234AUD MAX4234ASD TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 8 SOT23-8 8 MAX 10 MAX 10 UCSP-10 14 TSSOP 14 SO TOP MARK AAKW -- -- ABE -- --
Chip Information
MAX4230 TRANSISTOR COUNT: 230 MAX4231 TRANSISTOR COUNT: 230 MAX4232 TRANSISTOR COUNT: 462 MAX4233 TRANSISTOR COUNT: 462 MAX4234 TRANSISTOR COUNT: 924
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 0.1F 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 components close to the op amps' pins, minimizing trace and lead lengths.
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13
High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
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.)
SC70, 5L.EPS
14
______________________________________________________________________________________
SC70, 6L.EPS
High-Output-Drive, 10MHz, 10V/s, 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.)
SOT-23 5L .EPS
MAX4230-MAX4234
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1 1
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1 1
______________________________________________________________________________________
6LSOT.EPS
15
High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
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.)
8LUMAXD.EPS
4X S
8
8
INCHES DIM A A1 A2 b MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
y 0.500.1
E
H
0.60.1
c D e E H L
1
1
0.60.1
S
D
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
c e b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
1 1
J
16
______________________________________________________________________________________
High-Output-Drive, 10MHz, 10V/s, 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.)
SOT23, 8L .EPS
MAX4230-MAX4234
SEE DETAIL "A" b
C L
e
SYMBOL A A1 A2 b C D E E1 L L2 e e1
MIN 0.90 0.00 0.90 0.28 0.09 2.80 2.60 1.50 0.30
MAX 1.45 0.15 1.30 0.45 0.20 3.00 3.00 1.75 0.60 0.25 BSC.
C L
E
C L
E1
PIN 1 I.D. DOT (SEE NOTE 6) e1 D C
C L
0
0.65 BSC. 1.95 REF. 0 8
L2 A A2 A1
SEATING PLANE C
GAUGE PLANE
L
0
NOTE:
1. ALL DIMENSIONS ARE IN MILLIMETERS. 2. FOOT LENGTH MEASURED FROM LEAD TIP TO UPPER RADIUS OF HEEL OF THE LEAD PARALLEL TO SEATING PLANE C. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL BURR. 4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING. 5. COPLANARITY 4 MILS. MAX. 6. PIN 1 I.D. DOT IS 0.3 MM y MIN. LOCATED ABOVE PIN 1. 7. SOLDER THICKNESS MEASURED AT FLAT SECTION OF LEAD BETWEEN 0.08mm AND 0.15mm FROM LEAD TIP. 8. MEETS JEDEC MO178.
PROPRIETARY INFORMATION TITLE:
DETAIL "A"
PACKAGE OUTLINE, SOT-23, 8L BODY
APPROVAL DOCUMENT CONTROL NO. REV.
21-0078
1 1
D
______________________________________________________________________________________
17
High-Output-Drive, 10MHz, 10V/s, Rail-to-Rail I/O Op Amps with Shutdown in SC70 MAX4230-MAX4234
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.)
12L, UCSP 4x3.EPS
PACKAGE OUTLINE, 4x3 UCSP 21-0104 F
1 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.
18 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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