MAX4224EUT+T ,1GHz, Low-Power, SOT23, Current Feedback Amplifiers with ShutdownApplicationsMAX4223EUT-T -40°C to +85°C 6 SOT23 AAADADC Input Buffers Data CommunicationsMAX4223ESA ..
MAX4225ESA ,1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with ShutdownFeaturesThe MAX4223–MAX4228 current-feedback amplifiers' Ultra-High Speed and Fast Settling Time:co ..
MAX4226ESD ,1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with ShutdownELECTRICAL CHARACTERISTICS(V = +5V, V = -5V, SHDN = 5V, V = 0V, R = ¥ , T = T to T , unless otherwi ..
MAX4226EUB+ ,1GHz, Low-Power, SOT23, Current Feedback Amplifiers with ShutdownELECTRICAL CHARACTERISTICS(V = +5V, V = -5V, SHDN = 5V, V = 0V, R = ¥ , T = T to T , unless otherwi ..
MAX4227ESA ,1GHz, Low-Power, SOT23, Current-Feedback Amplifiers with ShutdownApplicationsMAX4223EUT-T -40°C to +85°C 6 SOT23 AAADADC Input Buffers Data CommunicationsMAX4223ESA ..
MAX422CPA ,【15 Volt Chopper Stabilized Operational AmplifierELECTRICAL CHARACTERISTICS MAX420, MAX421
( + 2 +15V, V- = -15V, TA = +25°C1Testcircuitunless no ..
MAX809REUR ,3-Pin Microprocessor Reset CircuitsMAX803/MAX809/ 3-Pin Microprocessor Reset CircuitsMAX810
MAX809REUR+ ,3-Pin Microprocessor Reset CircuitsFeatures● Precision Monitoring of +2.5V, +3V, +3.3V, and The MAX803/MAX809/MAX810 are microprocess ..
MAX809REUR+T ,3-Pin Microprocessor Reset CircuitsGeneral Description Beneits and
MAX809REUR-T ,3-Pin Microprocessor Reset CircuitsFeaturesThe MAX803/MAX809/MAX810 are microprocessor (µP) Precision Monitoring of +2.5V, +3V, +3.3V ..
MAX809REUR-T10 ,3-Pin Microprocessor Reset CircuitsMAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z19-0344; Rev 4; 12/993-Pin Microprocessor ..
MAX809REXR+T ,3-Pin Microprocessor Reset CircuitsApplications● ComputersGND GND● Controllers● Intelligent Instruments*MAX803 ONLY● Critical μP and μ ..
MAX4223ESA+-MAX4224EUT+T-MAX4226EUB+
1GHz, Low-Power, SOT23, Current Feedback Amplifiers with Shutdown
_______________General DescriptionThe MAX4223–MAX4228 current-feedback amplifiers
combine ultra-high-speed performance, low distortion,
and excellent video specifications with low-power oper-
ation. The MAX4223/MAX4224/MAX4226/MAX4228
have a shutdown feature that reduces power-supply
current to 350μA and places the outputs into a high-
impedance state. These devices operate with dual sup-
plies ranging from ±2.85V to ±5.5V and provide a
typical output drive current of 80mA. The MAX4223/
MAX4225/MAX4226 are optimized for a closed-loop
gain of +1 (0dB) or more and have a -3dB bandwidth of
1GHz, while the MAX4224/MAX4227/MAX4228 are
compensated for a closed-loop gain of +2 (6dB) or
more, and have a -3dB bandwidth of 600MHz (1.2GHz
gain-bandwidth product).
The MAX4223–MAX4228 are ideal for professional video
applications, with differential gain and phase errors of
0.01% and 0.02°, 0.1dB gain flatness of 300MHz, and a
1100V/μs slew rate. Total harmonic distortion (THD) of
-60dBc (10MHz) and an 8ns settling time to 0.1% suit
these devices for driving high-speed analog-to-digital
inputs or for data-communications applications. The low-
power shutdown mode on the MAX4223/MAX4224/
MAX4226/MAX4228 makes them suitable for portable
and battery-powered applications. Their high output
impedance in shutdown mode is excellent for multiplex-
ing applications.
The single MAX4223/MAX4224 are available in space-
saving 6-pin SOT23 packages. All devices are available
in the extended -40°C to +85°C temperature range.
________________________ApplicationsADC Input BuffersData Communications
Video CamerasVideo Line Drivers
Video SwitchesVideo Multiplexing
Video EditorsXDSL Drivers
RF ReceiversDifferential Line Drivers
____________________________FeaturesUltra-High Speed and Fast Settling Time:
1GHz -3dB Bandwidth (MAX4223, Gain = +1)
600MHz -3dB Bandwidth (MAX4224, Gain = +2)
1700V/μs Slew Rate (MAX4224)
5ns Settling Time to 0.1% (MAX4224)Excellent Video Specifications (MAX4223):
Gain Flatness of 0.1dB to 300MHz
0.01%/0.02°DG/DP ErrorsLow Distortion:
-60dBc THD (fc= 10MHz)
42dBm Third-Order Intercept (f = 30MHz)6.0mA Quiescent Supply Current (per amplifier)Shutdown Mode:
350μA Supply Current (per amplifier)
100kΩOutput ImpedanceHigh Output Drive Capability:
80mA Output Current
Drives up to 4 Back-Terminated 75ΩLoads to
±2.5V while Maintaining Excellent Differential
Gain/Phase CharacteristicsAvailable in Tiny 6-Pin SOT23 and 10-Pin μMAX
PackagesGHz, Low-Power, SOT23,
Current-Feedback Amplifiers with ShutdownVEE
IN-IN+6VCCSHDN
OUT
MAX4223
MAX4224
SOT23-6TOP VIEW4
_________________Pin Configurations19-1230; Rev 2a; 6/97
PART
MAX4223EUT-TMAX4223ESA-40°C to +85°C
-40°C to +85°C
TEMP. RANGEPIN-
PACKAGE6 SOT23
8 SO
EVALUATION KITAVAILABLE
______________Ordering Information
_____________________Selector GuidePin Configurations
continued at end
of data sheet.
Ordering Information continued at end of data sheet.
SOT
TOP MARKAAAD
10 μMAX,
14 SO
8 SO
10 μMAX,
14 SO
8 SO
6 SOT23, 8 SO
6 SOT23, 8 SO
PIN-
PACKAGEYes
Yes
Yes
Yes
SHUT-
DOWN
MODE
AMPS
PER
PKG.MAX4227
MAX4228
PARTMAX4225
MAX4226MAX4223
MAX4224
MIN.
GAIN
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= +5V, VEE= -5V, SHDN= 5V, VCM= 0V, RL= ¥, TA= TMINto TMAX, unless otherwise noted. Typical values are at = +25°C.) (Note 1)
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.
Supply Voltage (VCCto VEE)..................................................12V
Analog Input Voltage.......................(VEE- 0.3V) to (VCC+ 0.3V)
Analog Input Current........................................................±25mA
SHDNInput Voltage.........................(VEE- 0.3V) to (VCC+ 0.3V)
Short-Circuit Duration
OUT to GND...........................................................Continuous
OUT to VCCor VEE............................................................5sec
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW
10-Pin μMAX (derate 5.6mW/°C above +70°C)............444mW
14-Pin SO (derate 8.3mW/°C above +70°C).................667mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
CONDITIONS±0.5±4
UNITSMINTYPMAXSYMBOLPARAMETER±0.5±5VOSInput Offset Voltage±10Input Bias Current
(Positive Input)= TMINto TMAXμA±15= +25°C45RIN-Input Resistance (Negative Input)700RIN+Input Resistance (Positive Input)61
Inferred from CMRR testV±2.5±3.2VCMInput Common-Mode
Voltage Range
Inferred from PSRR testV±2.85±5.5VCC/VEE
VCM= ±2.5V
Operating Supply Voltage
Range7450CMRRCommon-Mode Rejection Ratio
VCC= 2.85V to 5.5V,
VEE= -2.85V to -5.5VdB63PSRRPower-Supply Rejection Ratio
Shutdown mode (SHDN= 0V) mA0.350.55= 50Ω
ISYQuiescent Supply Current
(per Amplifier)
Normal mode (SHDN= 5V) 6.09.0±2.5±2.8VOUTOutput Voltage Swing
VOUT= ±2.5VMΩ0.30.8TROpen-Loop Transresistance
VOUT= ±2.5VmA6080IOUTOutput Current (Note 2)
0.71.5= short to groundmA140ISCShort-Circuit Output Current0.8VILSHDNLogic Low±20TA= +25°C±4±25
IB+= +25°C= TMINto TMAX= +25°C= TMINto TMAX= ¥= 50Ω2.0VIHSHDNLogic HighTA= TMINto TMAX
MAX4223/MAX4224
MAX4223/MAX4224
MAX4225–MAX4228
μV/°C±2TCVOSInput Offset Voltage Drift
MAX4225–MAX4228= TMINto TMAX±30
Input Bias Current
(Negative Input)
±35
IB-= +25°C
MAX4223/MAX4224
MAX4225–MAX4228
MAX4223/MAX4224
MAX4225–MAX4228
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
DC ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V, VEE= -5V, SHDN= 5V, VCM= 0V, RL= ¥, TA= TMINto TMAX, unless otherwise noted. Typical values are at = +25°C.) (Note 1)
AC ELECTRICAL CHARACTERISTICS (VCC= +5V, VEE= -5V, SHDN= 5V, VCM= 0V, AV= +1V/V for MAX4223/MAX4225/MAX4226, AV= +2V/V for MAX4224/MAX4227/
MAX4228, RL= 100Ω, TA= +25°C, unless otherwise noted.) (Note 4)100
CONDITIONS70
UNITSMINTYPMAXSYMBOLPARAMETERIIL/IIHSHDNInput CurrentSHDN= 0V or 5V
SHDN= 0V, VOUT= -2.5V to +2.5V
(Note 3)
Shutdown Mode Output
ImpedancekΩ
MAX4224/7/8
MAX4223/5/6200
MAX4223/5/6
VOUT= 2V stepMAX4224/7/8
THD
Total Harmonic Distortion= 1kΩ
VOUT= 4V step625800
CONDITIONSGain Peaking
VOUT= 2Vp-pMHz330BWLSLarge-Signal Bandwidth
MAX4223/4/6/8
VOUT= 2V step= 100Ω
MAX4223/5/6
MAX4223/5/62
tONTurn-On Time from Shutdown
SHDN= 0V, f = 10MHz, MAX4223/4/6/8dB65Off Isolation= 150Ω(Note 6)
degrees0.01
VCC, VEE= 0V to ±5V stepns100tUP
MAX4223/4/6/8
Power-Up Time= 150Ω(Note 6)%0.02DGDifferential Gain Error300tOFFTurn-Off Time to Shutdown
f = 30MHz,= 50Ω
MAX4225/6
dBc-61
MAX4223/5/6
MAX4224/7/8
MAX4224/7/8DPDifferential Phase Error
MAX4224/7/8
MAX4224/7/8
MAX4223/5/6
MAX4223/5/6Rising edge
MAX4223/5/6
VOUT= 2Vp-p,= 10MHz
MAX4224/7/8
MAX4223/5/6
Falling edge11001400
V/μsSRSlew Rate (Note 5)
MAX4224/7/8
UNITSMINTYPMAXSYMBOLPARAMETER
MAX4224/7/8
tr, tfRise and Fall Time
MAX4223/5/6
MAX4223/5/6
MAX4224/7/8
MAX4223/5/6
VOUT= 20mVp-pMHz
MAX4224/7/8
BW0.1dBBandwidth for ±0.1dB
Gain Flatness (Note 5)
VOUT= 20mVp-p
-72MAX4227/8
XTALKSettling Time to 0.1%
Crosstalk
MHzBW-3dB Small-Signal Bandwidth
(Note 5)
MAX4224/7/8
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
Note 1:The MAX422_EUT is 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design.
Note 2:Absolute Maximum Power Dissipation must be observed.
Note 3:Does not include impedance of external feedback resistor network.
Note 4:AC specifications shown are with optimal values of RFand RG. These values vary for product and package type, and are
tabulated in the Applications Informationsection of this data sheet.
Note 5:The AC specifications shown are not measured in a production test environment. The minimum AC specifications given are
based on the combination of worst-case design simulations along with a sample characterization of units. These minimum
specifications are for design guidance only and are not intended to guarantee AC performance (see AC Testing/
Performance). For 100% testing of these parameters, contact the factory.
Note 6:Input Test Signal: 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0IRE to 100IRE). IRE is a unit of
video signal amplitude developed by the International Radio Engineers. 140IRE = 1V.
Note 7:Assumes printed circuit board layout similar to that of Maxim’s evaluation kit.
AC ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V, VEE= -5V, SHDN= 5V, VCM= 0V, AV= +1V/V for MAX4223/MAX4225/MAX4226, AV= +2V/V for MAX4224/MAX4227/
MAX4228, RL= 100Ω, TA= +25°C, unless otherwise noted.) (Note 4)
__________________________________________Typical Operating Characteristics(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)100100010
MAX4223
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +1)AX4223-01
FREQUENCY (MHz)
(d
VIN = 20mVp-p
SO-8 PACKAGE
RF = 560W
SOT23-6
RF = 470W100100010
MAX4223
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2/+5)AX4223-02
FREQUENCY (MHz)
(d
VIN = 20mVp-p
AV = +2V/V
RF = RG = 200W
AV = +5V/V
RF = 100W
RG = 25W100100010
MAX4223/MAX4225/MAX4226
LARGE-SIGNAL GAIN vs. FREQUENCY
(AVCL = +1)AX4223-03
FREQUENCY (MHz)
(d
AV = +1V/V
RF = 560W
VOUT = 2Vp-p
PARAMETERSYMBOLMINTYPMAXUNITSInput Capacitance (Note 7)CIN
0.8Third-Order InterceptIP336
dBm
SO-8, SO-14
packages
f = 30kHz= 30.1MHz
SOT23-6, 10-pin μMAX
packages
CONDITIONSOutput ImpedanceZOUTΩ1dB Gain Compression
dBmf = 10kHz
f = 10kHzInput Noise Current Densityin+, in-20pA/√Hzf = 10kHz
Input Noise Voltage DensitynV/√Hzf = 10kHz
MAX4223/5/6
MAX4224/7/8
-61Spurious-Free Dynamic RangeSFDR-62dBf = 10kHzMAX4223/5/6
MAX4224/7/8
IN+
IN-
Pin to pin
Pin to GND
Pin to pin
Pin to GND
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown100100010
MAX4224
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)FREQUENCY (MHz)
(d
VIN = 20mVp-p
SO-8 PACKAGE
RF = RG = 470W
SOT23-6 PACKAGE
RF = RG = 470W100100010
MAX4224
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +5/+10)AX4223-05
FREQUENCY (MHz)
(d
VIN = 20mVp-p
AVCL = +5V/V
RF = 240W
RG = 62W
AVCL = +10V/V
RF = 130W
RG = 15W100100010
MAX4224/MAX4227/MAX4228
LARGE-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)X4223-06
FREQUENCY (MHz)
(d
AVCL = +2V/V
RF = RG = 470W
VOUT = 2Vp-p100100010
MAX4225/MAX4226
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +1)AX4223-07
FREQUENCY (MHz)
(d
VIN = 20mVp-p
AVCL = +1V/V
RF = 560W
MAX4227/MAX4228
GAIN MATCHING vs. FREQUENCY
(AVCL = +2)
AX4223-10
FREQUENCY (MHz)
(d
VIN = 20mVp-p
AVCL = +2V/V
RF = RG = 470W100
MAX4225/MAX4226
GAIN MATCHING vs. FREQUENCY
(AVCL = +1)AX4223-08
FREQUENCY (MHz)
(d
AMPLIFIER A
VIN = 2OmVp-p
AVCL = +1V/V
RF = 560W
AMPLIFIER B
MAX4225/MAX4226
CROSSTALK vs. FREQUENCY
FREQUENCY (MHz)
(d
RS = 50W
VOUT = 2Vp-p
MAX4227/MAX4228
CROSSTALK vs. FREQUENCY
AX4223-12
FREQUENCY (MHz)
(d
RS = 50W
VOUT = 2Vp-p
____________________________Typical Operating Characteristics (continued)(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)100100010
MAX4227/MAX4228
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)AX4223-09
FREQUENCY (MHz)
IZE
(dB
VIN = 20mVp-p
AVCL = +2V/V
RF = RG = 470W
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
____________________________Typical Operating Characteristics (continued)(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)
MAX4223/MAX4225/MAX4226
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (AVCL = +1)
AX4223-13
FREQUENCY (MHz)
(d
AVCL = +1V/V
RF = 560W
VCC
VEE
MAX4224/MAX4227/MAX4228
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (AVCL = +2)
FREQUENCY (MHz)
(d
AVCL = +2V/V
RF = RG = 470W
VCC
VEE
OUTPUT IMPEDANCE vs. FREQUENCY
AX4223-15
FREQUENCY (MHz)
IM
(W
MAX4224/7/8
AVCL = +2V/V
RF = RG = 470W
MAX4223/5/6
AVCL = +1V/V
RF = 560W
SHUTDOWN MODE OUTPUT ISOLATION
vs. FREQUENCY
X4223-16
FREQUENCY (MHz)
IS
(d
MAX4224/7/8
AVCL = +2V/V
RF = RG = 470W
MAX4223/5/6
AVCL = +1V/V
RF = 560W
MAX4224/MAX4227/MAX4228
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (RL = 150W)
FREQUENCY (MHz)
(d
3RD HARMONIC2ND HARMONIC
THD
MAX4223/MAX4225/MAX4226
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (RL = 150W)
AX4223-17
FREQUENCY (MHz)
(d
AVCL = +1V/V
RL = 150W
RF = 560W
VOUT = 2Vp-p
3RD HARMONIC2ND HARMONIC
THD
MAX4223/MAX4225/MAX4226
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (RL = 1kW)
AX4223-18
FREQUENCY (MHz)
(d
AVCL = +1V/V
RL = 1kW
RF = 560W
VOUT = 2Vp-p
2ND HARMONIC3RD HARMONIC
THD
MAX4224/MAX4227/MAX4228
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (RL = 1kW)
X4223-20
FREQUENCY (MHz)
(d
2ND HARMONIC
3RD HARMONIC
THD3040205060708090100
TWO-TONE THIRD-ORDER INTERCEPT
vs. FREQUENCYFREQUENCY (MHz)
IN
(d
MAX4224/7/8
MAX4223/5/6
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
____________________________Typical Operating Characteristics (continued)(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)
+100mV
-100mV
INPUT
+100mV
-100mV
OUTPUT
GND
GND
TIME (10ns/div)
MAX4223/MAX4225/MAX4226
SMALL-SIGNAL PULSE RESPONSE
(AVCL = +1)MAX4223-22
+100mV
-100mV
INPUT
+100mV
-100mV
OUTPUT
GND
GND
TIME (10ns/div)
MAX4223/MAX4225/MAX4226
SMALL-SIGNAL PULSE RESPONSE
(AVCL = +1, CL = 25pF)MAX4223-23
+50mV
-50mV
INPUT
+100mV
-100mV
OUTPUT
GND
GND
TIME (10ns/div)
MAX4224/MAX4227/MAX4228
SMALL-SIGNAL PULSE RESPONSE
(AVCL = +2)MAX4223-24
+50mV
-50mV
INPUT
+100mV
-100mV
OUTPUT
GND
GND
TIME (10ns/div)
MAX4224/MAX4227/MAX4228
SMALL-SIGNAL PULSE RESPONSE
(AVCL = +2, CL = 10pF)MAX4223-25
+1V
-1V
INPUT
+2V
-2V
OUTPUT
GND
GND
TIME (10ns/div)
MAX4224/MAX4227/MAX4228
LARGE-SIGNAL PULSE RESPONSE
(AVCL = +2)MAX4223-28
+2V
-2V
INPUT
+2V
-2V
OUTPUT
GND
GND
TIME (10ns/div)
MAX4223/MAX4225/MAX4226
LARGE-SIGNAL PULSE RESPONSE
(AVCL = +1)MAX4223-26
+2V
-2V
INPUT
+2V
-2V
OUTPUT
GND
GND
TIME (10ns/div)
MAX4223/MAX4225/MAX4226
LARGE-SIGNAL PULSE RESPONSE
(AVCL = +1, CL = 25pF)MAX4223-27
+1V
-1V
INPUT
+2V
-2V
OUTPUT
GND
GND
TIME (10ns/div)
MAX4224/MAX4227/MAX4228
LARGE-SIGNAL PULSE RESPONSE
(AVCL = +2,CL = 10pF)MAX4223-29
+400mV
-400mV
INPUT
+2V
-2V
OUTPUT
GND
GND
TIME (10ns/div)
MAX4224/MAX4227/MAX4228
LARGE-SIGNAL PULSE RESPONSE
(AVCL = +5)MAX4223-30
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with ShutdownPOWER-SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
AX4223-31
TEMPERATURE (°C)
(m
NORMAL
MODE
SHUTDOWN
MODE
INPUT BIAS CURRENT
vs. TEMPERATURE
AX4223-32
TEMPERATURE (°C)
(m
IB-
IB+
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
AX4223-33
TEMPERATURE (°C)
(m
SOURCING
SINKING
POSITIVE OUTPUT SWING
vs. TEMPERATURE
AX4223-34
TEMPERATURE (°C)
(VRL = OPEN
RL = 50W
NEGATIVE OUTPUT SWING
vs. TEMPERATURE
AX4223-35
TEMPERATURE (°C)
(V
RL = OPEN
RL = 50W
____________________________Typical Operating Characteristics (continued)(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
FUNCTION
______________________________________________________________Pin Description——9—6SHDNB
Amplifier B Shutdown Input.
Connect to +5V for normal
operation. Connect to GND for
low-power shutdown mode.95—
OUTBAmplifier B Output
SHDNA——
Amplifier A Shutdown Input.
Connect to +5V for normal
operation. Connect to GND for
low-power shutdown mode.—1178
INB+Amplifier B Noninverting Input
INB-——Amplifier B Inverting Input23
INA-Amplifier A Inverting Input
INA+——Amplifier A Noninverting Input2714101
VCCPositive Power-Supply
Voltage. Connect to +5V.
OUTA——Amplifier A Output——
IN-Amplifier Inverting Input
SHDN58
Amplifier Shutdown. Connect
to +5V for normal operation.
Connect to GND for low-
power shutdown.444—
VEENegative Power-Supply
Voltage. Connect to -5V.
IN+33Amplifier Noninverting Input——OUTAmplifier Output16
5, 7, 8, 10——N.C.
No Connect. Not internally
connected. Tie to GND for
optimum AC performance.1, 5
MAX4225
MAX4227μMAXSOSOSOT23
MAX4223/MAX4224MAX4226/MAX4228
PIN
NAMEFUNCTION
GHz, Low-Power, SOT23, Current-Feedback Amplifiers with Shutdown
_______________Detailed DescriptionThe MAX4223–MAX4228 are ultra-high-speed, low-
power, current-feedback amplifiers featuring -3dB
bandwidths up to 1GHz, 0.1dB gain flatness up to
300MHz, and very low differential gain and phase
errors of 0.01% and 0.02°, respectively. These devices
operate on dual ±5V or ±3V power supplies and
require only 6mA of supply current per amplifier. The
MAX4223/MAX4225/MAX4226 are optimized for
closed-loop gains of +1 (0dB) or more and have -3dB
bandwidths of 1GHz. The MAX4224/MAX4227/
MAX4228 are optimized for closed-loop gains of +2
(6dB) or more, and have -3dB bandwidths of 600MHz
(1.2GHz gain-bandwidth product).
The current-mode feedback topology of these ampli-
fiers allows them to achieve slew rates of up to
1700V/μs with corresponding large signal bandwidths
up to 330MHz. Each device in this family has an output
that is capable of driving a minimum of 60mA of output
current to ±2.5V.
Theory of OperationSince the MAX4223–MAX4228 are current-feedback
amplifiers, their open-loop transfer function is
expressed as a transimpedance:
The frequency behavior of this open-loop transimped-
ance is similar to the open-loop gain of a voltage-feed-
back amplifier. That is, it has a large DC value and
decreases at approximately 6dB per octave.
Analyzing the current-feedback amplifier in a gain con-
figuration (Figure 1) yields the following transfer func-
tion:
At low gains, (G x RIN-) << RF. Therefore, unlike tradi-
tional voltage-feedback amplifiers, the closed-loop
bandwidth is essentially independent of the closed-
loop gain. Note also that at low frequencies, TZ>> [(G
x RIN-) + RF], so that:
Low-Power Shutdown ModeThe MAX4223/MAX4224/MAX4226/MAX4228 have a
shutdown mode that is activated by driving the SHDN
input low. When powered from ±5V supplies, the SHDN
input is compatible with TTL logic. Placing the amplifier
in shutdown mode reduces quiescent supply current to
350μA typical, and puts the amplifier output into a high-
impedance state (100kΩtypical). This feature allows
these devices to be used as multiplexers in wideband
systems. To implement the mux function, the outputs of
multiple amplifiers can be tied together, and only the
amplifier with the selected input will be enabled. All of
the other amplifiers will be placed in the low-power
shutdown mode, with their high output impedance pre-
senting very little load to the active amplifier output. For
gains of +2 or greater, the feedback network imped-
ance of all the amplifiers used in a mux application
must be considered when calculating the total load on
the active amplifier output.
__________Applications Informationyout and Power-Supply BypassingThe MAX4223–MAX4228 have an extremely high band-
width, and consequently require careful board layout,
including the possible use of constant-impedance
microstrip or stripline techniques.VGR
OUT==+ 1
.GxTSSGxRR
whereGAR
OUTINFF())++=+orTOUTZ-
MAX4223
MAX4224
MAX4225
MAX4226
MAX4227
MAX4228
IN-
RIN-
OUT
IN+
VIN
Figure 1. Current-Feedback Amplifier
