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.
_________________General Description
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
are precision, closed-loop, gain of +2 (or -1) buffers
featuring high slew rates, high output current drive, and
low differential gain and phase error. They operate with
a single 3.15V to 11V supply or with ±1.575V to ±5.5V
dual supplies. The input common-mode voltage range
extends 100mV beyond the negative power-supply rail,
and the output swings Rail-to-Rail®.
These devices require only 5.5mA of quiescent supply
current while achieving a 230MHz -3dB bandwidth and
a 600V/µs slew rate. In addition, the MAX4215/
MAX4219 have a disable feature that reduces the sup-
ply current to 400µA per buffer. Input voltage noise is
only 10nV/√Hz, and input current noise is only
1.3pA/√Hz. This buffer family is ideal for low-power/low-
voltage applications requiring wide bandwidth, such as
video, communications, and instrumentation systems.
For space-sensitive applications, the MAX4214 comes
in a miniature 5-pin SOT23 package.
________________________Applications
Battery-Powered Instruments
Video Line Drivers
Analog-to-Digital Converter Interface
CCD Imaging Systems
Video Routing and Switching Systems
Video Multiplexing Applications
____________________________Features
♦Internal Precision Resistors for Closed-Loop
Gains of +2V/V or -1V/V
♦High Speed
230MHz -3dB Bandwidth
90MHz 0.1dB Gain Flatness
(MAX4219/MAX4222)
600V/µs Slew Rate
♦Single 3.3V/5.0V Operation
♦Outputs Swing Rail-to-Rail
♦Input Common-Mode Range Extends Beyond VEE
♦Low Differential Gain/Phase Error: 0.03%/0.04°
♦Low Distortion at 5MHz
-72dBc SFDR
-71dB Total Harmonic Distortion
♦High Output Drive: ±120mA
♦Low 5.5mA Supply Current
♦400µA Shutdown Supply Current
(MAX4215/MAX4219)
♦Space-Saving SOT23, µMAX, or QSOP Packages
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
________________________________________________________________ Maxim Integrated Products 1
VEE
IN-
IN+
15VCC
OUT
MAX4214
SOT23-5
TOP VIEW
2
34
19-4754; Rev 1; 8/01
PART
MAX4214EUK-T
MAX4215ESA
MAX4215EUA -40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE PIN-
PACKAGE
5 SOT23-5
8 SO
8 µMAX
Typical Application Circuit appears at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Pin Configurations continued at end of data sheet.
NO. OF
AMPS ENABLE
MAX4214 1No
MAX4215 1Yes
PART PIN-PACKAGE
5 SOT23
8 SO/µMAX
MAX4217 2No
MAX4219 3Yes
8 SO/µMAX
14 SO, 16 QSOP
MAX4222 4No 14 SO, 16 QSOP
TOP
MARK
ABAH
—
—
__________________Pin Configurations
_______________Ordering Information
______________________Selector Guide
MAX4217ESA
MAX4217EUA -40°C to +85°C
-40°C to +85°C 8 SO
8 µMAX
—
—
MAX4219ESD
MAX4219EEE -40°C to +85°C
-40°C to +85°C 14 SO
16 QSOP
—
—
MAX4222ESD
MAX4222EEE -40°C to +85°C
-40°C to +85°C 14 SO
16 QSOP
—
—
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = 0, IN_- = 0, EN_ = 5V, RL= ∞to 0, VOUT = VCC/2, noninverting configuration, TA= TMIN to TMAX, unless
otherwise noted. Typical values are at TA= +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 (VCC to VEE)..................................................12V
IN_-, IN_+, OUT_, EN_ ....................(VEE - 0.3V) to (VCC + 0.3V)
Output Short-Circuit Duration to VCC or VEE ..............Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
16-Pin QSOP (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, 10s) .................................+300°C
VCC to VEE, guaranteed by PSRR tests
RL= 50Ω
3.15 11.0
±150
0.04 0.075
IN_-
SOT23-5, µMAX
VEE - 0.1 VCC + 0.1
SO, QSOP
VCC - VOH
IN_+
V
VEE - 0.1 VCC - 2.25
Operating Supply Voltage
Range
Sinking or sourcing
VOL - VEE
VCC - VOH
VOL - VEE
VCC - VOH
IN_+, over input voltage range MΩ3
CONDITIONS
Between any two channels for
MAX4217/MAX4219/MAX4222
410
Input Resistance
IN_+ µA5.4 12IB
Input Bias Current
mV1
Input Offset Voltage
Matching
VIN
55 58
Input Voltage Range
µV/°C
45
RL≥50Ω, (VEE + 0.5V) ≤VOUT ≤(VCC - 2.0V)
VCC = 5V, VEE = 0, VOUT = 2.0V
60 66
VOL - VEE
RL= 150Ω0.04 0.075
RL= 2kΩ0.06
VCC = 3.3V, VEE = 0, VOUT = 0.90V
V
0.06
25
Power-Supply
Rejection Ratio
(Note 2)
V/V1.9 2 2.1
RIN
MAX4215/MAX4219 VVCC - 2.6VIL
EN_ Logic Low Threshold
AV
Voltage Gain
8TCVOS
Input Offset Voltage Drift
VCC - 1.6
MAX4215/MAX4219, EN_ = 0, 0 ≤VOUT ≤5V
mV
415
VOS
Input Offset Voltage
VCC = 5V, VEE = -5V, VOUT = 0
f = DCROUT
PSRR
Output Resistance
MAX4215/MAX4219
mΩ
VVIH
EN_ Logic High Threshold
dB
kΩ1
ROUT(OFF)
Disabled Output
Resistance
UNITSMIN TYP MAXSYMBOLPARAMETER
1.60 1.90
RL= 50Ω
mA
0.75 1.00
ISC
Short-Circuit Output
Current
±70 ±120
VOUT
Output Voltage Swing V
RL= 20Ωto VCC or VEE mA
±60
IOUT
Output Current TA= +25°C
TA= TMIN to TMAX
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VEE = 0, IN_- = 0, EN_ = 5V, RL= ∞to 0, VOUT = VCC/2, noninverting configuration, TA= TMIN to TMAX, unless
otherwise noted. Typical values are at TA= +25°C.) (Note 1)
AC ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = 0, IN_- = 0, EN_ = 5V, RL= 100Ωto VCC/2, noninverting configuration, TA= TMIN to TMAX, unless otherwise noted.
Typical values are at TA= +25°C.)
CONDITIONS
mA5.5 7.0ICC
Quiescent Supply
Current (per Buffer)
200 350MAX4215/MAX4219, EN_ = VEE
0.5 10
0.5
UNITSMIN TYP MAXSYMBOLPARAMETER
µA
µA
MAX4215/MAX4219, EN_ = VCC
MAX4215/MAX4219, (VEE + 0.2V) ≤EN_ ≤VCC
IIH
IIL
EN_ Logic Input High
Current
EN_ Logic Input Low
Current
MAX4214/MAX4215/MAX4217
230
0.04
10
VOUT =
2VP-P MHz
220
f = 10MHz
FPBW
Full-Power -3dB
Bandwidth
MAX4214/MAX4215/MAX4217
200
NTSC, RL= 150Ω
MAX4214/MAX4215/MAX4217
MAX4219/MAX4222
MAX4219/MAX4222
MAX4219/MAX4222
VOUT = 100mVP-P ns1
CONDITIONS
VOUT = 2V step
200
Rise/Fall Time
VOUT = 2V step ns45tS
Settling Time to 0.1%
V/µs600SRSlew Rate
VOUT =
100mVP-P
BW-3dB
-72
dBc
Second harmonic
Small-Signal -3dB
Bandwidth MHz
-71
fC= 5MHz, VOUT = 2VP-P
VOUT = 2VP-P,
fC= 5MHz -77
pF1
MAX4215/MAX4219, EN_ = 0
Third harmonic
2
CIN
Input Capacitance
Total harmonic distortion
35
dBc-72
tR, tF
SFDR
Spurious-Free Dynamic
Range
90
VOUT =
100mVP-P
50
BW0.1dB
Bandwidth for 0.1dB Gain
Flatness MHz
f = 10MHzIP3
HD
Third-Order Intercept
Harmonic Distortion
dBm
COUT(OFF)
UNITSMIN TYP MAXSYMBOLPARAMETER
Disabled Output
Capacitance pF
0.03
f = 10kHz
degrees
1.3
DPDifferential Phase Error
dBm11
Input 1dB Compression
Point
NTSC, RL= 150Ω
f = 10kHzin
en
DG
Input Noise-Current
Density
Input Noise-Voltage
Density
Differential Gain Error
pA/√Hz
nV/√Hz
%
MAX4215/MAX4219, disabled (EN_ = VEE)µA400 550ISD
Shutdown Supply Current
Note 1: The MAX421_EU_ is 100% production tested at TA= 25°C. Specifications over temperature limits are guaranteed by design.
Note 2: PSRR for single 5V supply tested with VEE = 0, VCC = 4.5V to 5.5V; for dual ±5V supply with VEE = -4.5V to -5.5V,
VCC = 4.5V to 5.5V; and for single 3V supply with VEE = 0, VCC = 3.15V to 3.45V.
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(VCC = 5V, VEE = 0, AVCL = 2V/V, RL= 100Ωto VCC/2, TA= +25°C, unless otherwise noted.)
10
0
100k 1M 10M 100M 1G
MAX4214/MAX4215/MAX4217
SMALL-SIGNAL GAIN vs. FREQUENCY
2
MAX4214 toc01
FREQUENCY (Hz)
GAIN (dB)
4
6
8
9
1
3
5
7
VOUT = 100mVP-P
5.5
100k 1M 10M 100M 1G
MAX4214/MAX4215/MAX4217
GAIN FLATNESS vs. FREQUENCY
FREQUENCY (Hz)
5.6
6.5
5.7
MAX4214 toc02
GAIN (dB)
5.9
6.1
6.3
6.4
5.8
6.0
6.2
VOUT = 100mVP-P
10
0
100k 1M 10M 100M 1G
MAX4214/MAX4215/MAX4217
LARGE-SIGNAL GAIN vs. FREQUENCY
2
MAX4214 toc03
FREQUENCY (Hz)
GAIN (dB)
4
6
8
9
1
3
5
7
VOUT = 2VP-P
10
0
100k 1M 10M 100M 1G
MAX4219/MAX4222
SMALL-SIGNAL GAIN vs. FREQUENCY
2
MAX4214 toc04
FREQUENCY (Hz)
GAIN (dB)
4
6
8
9
1
3
5
7
VOUT = 100mVP-P
5.5
100k 1M 10M 100M 1G
MAX4219/MAX4222
GAIN FLATNESS vs. FREQUENCY
FREQUENCY (Hz)
5.6
6.5
5.7
MAX4214 toc05
GAIN (dB)
5.9
6.1
6.3
6.4
5.8
6.0
6.2
VOUT = 100mVP-P
10
0
100k 1M 10M 100M 1G
MAX4219/MAX4222
LARGE-SIGNAL GAIN vs. FREQUENCY
2
MAX4214 toc06
FREQUENCY (Hz)
GAIN (dB)
4
6
8
9
1
3
5
7
VOUT = 2VP-P
RL = 100Ω
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VEE = 0, IN_- = 0, EN_ = 5V, RL= 100Ωto VCC/2, noninverting configuration, TA= TMIN to TMAX, unless otherwise noted.
Typical values are at TA= +25°C.)
All-Hostile Crosstalk XTALK MAX4217/MAX4219/MAX4222, f = 10MHz,
VOUT = 2VP-P dB
PARAMETER SYMBOL MIN TYP MAX UNITS
Buffer Enable Time tON 100 ns
-95
Buffer Gain Matching dB
MAX4217/MAX4219/MAX4222, f = 10MHz,
VOUT = 100mVP-P
MAX4215/MAX4219
0.1
Buffer Disable Time tOFF 1µsMAX4215/MAX4219
Output Impedance ZOUT 200 mΩf = 10MHz
CONDITIONS
0
-100
100k 1M 10M 100M
HARMONIC DISTORTION
vs. FREQUENCY
-80
MAX4214 toc07
FREQUENCY (Hz)
HARMONIC DISTORTION (dBc)
-60
-40
-20
-10
-90
-70
-50
-30
VOUT = 2VP-P
2ND HARMONIC
3RD HARMONIC
0
-100
0 100 200 300 400 500 600 700 800 900 1k
HARMONIC DISTORTION
vs. RESISTIVE LOAD
-80
MAX4214 toc08
RESISTIVE LOAD (Ω)
HARMONIC DISTORTION (dBc)
-60
-40
-20
-10
-90
-70
-50
-30
VOUT = 2VP-P
f = 5MHz
2ND HARMONIC
3RD HARMONIC
0
-100
0.5 1.0 1.5 2.0 2.5 3.0 3.5
HARMONIC DISTORTION
vs. VOLTAGE SWING
-80
MAX4214 toc09
VOLTAGE SWING (Vp-p)
HARMONIC DISTORTION (dBc)
-60
-40
-20
-10
-90
-70
-50
-30
f = 5MHz
2ND HARMONIC
3RD HARMONIC
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
_______________________________________________________________________________________ 5
100
10
1
1 10 1k 10M1M
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX4214 toc10
FREQUENCY (Hz)
NOISE (nV/√Hz)
100 10k 100k
10
1
1 10 1k 10M1M
CURRENT-NOISE DENSITY
vs. FREQUENCY
FREQUENCY (Hz)
NOISE (pA/ √Hz)
100 10k 100k
MAX4214 toc11
50
-150
100k 1M 10M 100M 1G
MAX4217/MAX4219/MAX4222
CROSSTALK vs. FREQUENCY
-110
MAX4214 toc12
FREQUENCY (Hz)
CROSSTALK (dB)
-70
-30
10
30
-130
-90
-50
-10
_____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 2V/V, RL= 100Ωto VCC/2, TA= +25°C, unless otherwise noted.)
20
-80
100k 1M 10M 100M
POWER-SUPPLY REJECTION
vs. FREQUENCY
-60
MAX4214 toc13
FREQUENCY (Hz)
POWER-SUPPLY REJECTION (dB)
-40
-20
0
10
-70
-50
-30
-10
10
-90
100k 10M 100M1M
MAX4215/MAX4219
OFF-ISOLATION vs. FREQUENCY
-80
MAX4214 toc14
FREQUENCY (Hz)
OFF-ISOLATION (dB)
-70
-60
-50
-40
-30
-20
-10
0
100
0.01
100k 1M 10M 100M 1G
CLOSED-LOOP OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4214 toc15
FREQUENCY (Hz)
IMPEDANCE (Ω)
10
0.1
1
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
6 _______________________________________________________________________________________
IN
OUT
25mV/div
SMALL-SIGNAL PULSE RESPONSE
MAX4214 toc19
20ns/div
VCM = 1.25V, RL = 100Ω to GROUND
IN
OUT
500mV/div
LARGE-SIGNAL PULSE RESPONSE
MAX4214 toc20
20ns/div
VCM = 0.9V, RL = 100Ω to GROUND
EN_
5.0V
(ENABLE)
0
(DISABLE)
1V
0
OUT
ENABLE RESPONSE TIME
MAX4214 toc21
1µs/div
VIN = 0.5V
IN
OUT
25mV/div
SMALL-SIGNAL PULSE RESPONSE
(CL = 5pF)
20ns/div
VCM = 1.25V, RL = 100Ω to 0
MAX4214 toc22
IN
OUT
500mV/div
LARGE-SIGNAL PULSE RESPONSE
(CL = 5pF)
MAX4214 toc23
20ns/div
VCM = 1.75V, RL = 100Ω to 0
5.0
4.8
4.6
4.2
4.4
4.0
MAX4214 toc24
TEMPERATURE (°C)
-25-50 0 755025 100
VOLTAGE SWING vs. TEMPERATURE
VOLTAGE SWING (Vp-p)
RL = 150Ω to 0
-0.06
0 100
0100
DIFFERENTIAL GAIN AND PHASE
-0.01
-0.04
0.00
-0.02
0.01
0.00
0.02
0.02
0.04
0.03
IRE
IRE
DIFF. PHASE (deg) DIFF. GAIN (%)
MAX4214 toc16
RL = 150Ω
VCM = 1.35V
RL = 150Ω
VCM = 1.35V
350
300
250
150
50
100
200
0
MAX4214 toc17
LOAD RESISTANCE (Ω)
1000 200 500400300
CLOSED-LOOP BANDWIDTH
vs. LOAD RESISTANCE
CLOSED-LOOP BANDWIDTH (MHz)
VOUT = 100mVP-P
4.5
5.0
4.0
3.5
2.5
2.0
1.5
3.0
1.0
MAX4214 toc18
LOAD RESISTANCE (Ω)
25 50 75 100 125 150 175 200 225 250
OUTPUT SWING
vs. LOAD RESISTANCE
OUTPUT SWING (Vp-p)
_____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 2V/V, RL= 100Ωto VCC/2, TA= +25°C, unless otherwise noted.)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
_______________________________________________________________________________________ 7
5
4
3
1
2
0
MAX4214 toc25
TEMPERATURE (°C)
-25-50 0 755025 100
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT OFFSET VOLTAGE (mV)
6.0
5.5
4.5
5.0
4.0
MAX4214 toc26
TEMPERATURE (°C)
-25-50 0 755025 100
INPUT BIAS CURRENT
vs. TEMPERATURE
INPUT BIAS CURRENT (µA)
0.20
0.16
0.12
0.04
0.08
0
MAX4214 toc27
TEMPERATURE (°C)
-25-50 0 755025 100
INPUT OFFSET CURRENT
vs. TEMPERATURE
INPUT OFFSET CURRENT (µA)
10
8
6
4
2
0
MAX4214 toc28
POWER-SUPPLY VOLTAGE (V)
43 5 6 7 8 9 10 11
POWER-SUPPLY CURRENT (mA)
POWER-SUPPLY CURRENT (PER AMPLIFIER)
vs. POWER-SUPPLY VOLTAGE
7
6
4
5
3
MAX4214 toc29
TEMPERATURE (°C)
-25-50 0 755025 100
POWER-SUPPLY CURRENT (PER AMPLIFIER)
vs. TEMPERATURE
POWER-SUPPLY CURRENT (mA)
_____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 2V/V, RL= 100Ωto VCC/2, TA= +25°C, unless otherwise noted.)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
8 _______________________________________________________________________________________
1 6 — — — — — OUT Amplifier Output
3 3 — — — — — IN+ Noninverting Input
2 4 4 11 13 11 13 VEE Negative Power Supply or Ground (in
single-supply operation)
5 7 8 4 4 4 4 VCC Positive Power Supply
— — — 1 1 — — ENA Enable Amplifier A
—1, 5 —
MAX4215 MAX4217 MAX4214
— 8 — — — — — EN Enable Amplifier
4 2 — — — — — IN- Inverting Input
— — — 2 2 — — ENC Enable Amplifier C
— — 2 6 6 2 2 INA- Amplifier A Inverting Input
— — 1 7 7 1 1 OUTA Amplifier A Output
PIN
—8, 9 —
QSOP SOSO
— — 7 8 10 7 7 OUTB Amplifier B Output
— — 5 10 12 5
8, 9
QSOP
5 INB+ Amplifier B Noninverting Input
— — —
— — 6 9 11 6 6 INB- Amplifier B Inverting Input
N.C.
— — 3 5 5 3 3 INA+ Amplifier A Noninverting Input
3 3 — — ENB Enable Amplifier B
No Connection. Not internally connect-
ed. Tie to ground or leave open.
— — — 13 15 911 INC- Amplifier C Inverting Input
— — — 14 16 810 OUTC Amplifier C Output
— — — — — 14 16 OUTD Amplifier D Output
— — — — — 12 14 IND+ Amplifier D Noninverting Input
— — — — — 13 15 IND- Amplifier D Inverting Input
— — — 12 14 10 12 INC+ Amplifier C Noninverting Input
NAME FUNCTION
MAX4219 MAX4222
_______________________________________________________________Pin Description
SOT23-5 SO/µMAX SO/µMAX
______________
__
Detailed Description
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
are single-supply, rail-to-rail output, voltage-feedback,
closed-loop buffers that employ current-feedback tech-
niques to achieve 600V/µs slew rates and 230MHz
bandwidths. These buffers use internal 500Ωresistors
to provide a preset closed-loop gain of 2V/V in the non-
inverting configuration or -1V/V in the inverting configu-
ration. Excellent harmonic distortion and differential
gain/phase performance make them an ideal choice for
a wide variety of video and RF signal-processing appli-
cations.
Local feedback around the buffer’s output stage
ensures low output impedance, which reduces gain
sensitivity to load variations. This feedback also pro-
duces demand-driven current bias to the output tran-
sistors for ±120mA drive capability, while constraining
total supply current to less than 7mA.
___________Applications Information
Power Supplies
These devices operate from a single 3.15V to 11V
power supply or from dual supplies of ±1.575V to
±5.5V. For single-supply operation, bypass the VCC pin
to ground with a 0.1µF capacitor as close to the pin as
possible. If operating with dual supplies, bypass each
supply with a 0.1µF capacitor.
Selecting Gain Configuration
Each buffer in the MAX4214 family can be configured
for a voltage gain of 2V/V or -1V/V. For a gain of 2V/V,
ground the inverting terminal. Use the noninverting ter-
minal as the signal input of the buffer (Figure 1a).
Grounding the noninverting terminal and using the
inverting terminal as the signal input configures the
buffer for a gain of -1V/V (Figure 1b).
Since the inverting input exhibits a 500Ωinput imped-
ance, terminate the input with a 56Ωresistor when con-
figured for an inverting gain in 50Ωapplications
(terminate with 88Ωin 75Ωapplications). Terminate the
input with a 49.9Ωresistor in the noninverting case.
Output terminating resistors should directly match
cable impedances in either configuration.
Layout Techniques
Maxim recommends using microstrip and stripline tech-
niques to obtain full bandwidth. To ensure the PC
board does not degrade the buffer’s performance,
design it for a frequency greater than 1GHz. Pay care-
ful attention to inputs and outputs to avoid large para-
sitic capacitance. Whether or not you use a constant-
impedance board, observe the following guidelines
when designing the board:
•Don’t use wire-wrapped boards. They are too induc-
tive.
•Don’t use IC sockets. They increase parasitic capac-
itance and inductance.
•Use surface-mount instead of through-hole compo-
nents for better high-frequency performance.
•Use a PC board with at least two layers; it should be
as free from voids as possible.
•Keep signal lines as short and as straight as possi-
ble. Do not make 90° turns; round all corners.
Input Voltage Range and Output Swing
The MAX4214 family’s input range extends from
(VEE - 100mV) to (VCC - 2.25V). Input ground sensing
increases the dynamic range for single-supply applica-
tions. The outputs drive a 2kΩload to within 60mV of
the power-supply rails. With smaller resistive loads, the
output swing is reduced as shown in the Electrical
Characteristics and Typical Operating Characteristics.
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
_______________________________________________________________________________________ 9
MAX42_ _
500Ω
500Ω
IN-
OUT
RO
RTO
OUT
IN
RTIN
IN+
Figure 1a. Noninverting Gain Configuration (AV= +2V/V)
MAX42_ _
500Ω500Ω
OUT
RO
RTO
OUT
RS
RTIN
IN+
IN-
IN
Figure 1b. Inverting Gain Configuration (AV= -1V/V)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
As the load resistance decreases, the useful input range
is effectively limited by the output drive capability, since
the buffers have a fixed voltage gain of 2V/V or -1V/V.
For example, a 50Ωload can typically be driven from
40mV above VEE to 1.6V below VCC, or 40mV to 3.4V
when operating from a single 5V supply. If the buffer is
operated in the noninverting, gain of 2V/V configuration
with the inverting input grounded, the useful input volt-
age range becomes 20mV to 1.7V instead of the
-100mV to 2.75V indicated by the Electrical Character-
istics. Beyond the useful input range, the buffer output
is a nonlinear function of the input, but it will not under-
go phase reversal or latchup.
Enable
The MAX4215/MAX4219 have an enable feature (EN_)
that allows the buffer to be placed in a low-power state.
When the buffers are disabled, the supply current is
reduced to 400µA per buffer.
As the voltage at the EN_ pin approaches the negative
supply rail, the EN_ input current rises. Figure 2 shows
a graph of EN_ input current versus EN_ pin voltage.
Figure 3 shows the addition of an optional resistor in
series with the EN pin, to limit the magnitude of the cur-
rent increase. Figure 4 displays the resulting EN pin
input current to voltage relationship.
Disabled Output Resistance
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
include internal protection circuitry that prevents dam-
age to the precision input stage from large differential
input voltages (Figure 5). This protection circuitry con-
sists of five back-to-back Schottky diodes between
IN_+ and IN_-. These diodes reduce the disabled out-
put resistance from 1kΩto 500Ωwhen the output volt-
age is 3V greater or less than the voltage at IN_+.
Under these conditions, the input protection diodes will
be forward biased, lowering the disabled output resis-
tance to 500Ω.
Output Capacitive Loading and Stability
The MAX4214 family provides maximum AC perfor-
mance with no load capacitance. This is the case when
the load is a properly terminated transmission line.
These devices are designed to drive up to 20pF of load
capacitance without oscillating, but AC performance
will be reduced under these conditions.
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
10 ______________________________________________________________________________________
20
-160
0 100 300 500
-100
-120
0
VIL (mV ABOVE VEE)
INPUT CURRENT (µA)
200 400
-60
-140
-20
-40
-80
Figure 2. Enable Logic-Low Input Current vs. Enable Logic-
Low Threshold
OUT
IN-
EN_
IN+
10kΩ
ENABLE
500Ω500Ω
MAX42_ _
Figure 3. Circuit to Reduce Enable Logic-Low Input Current
0
-10
0 100 300 500
-7
-8
-1
VIL (mV ABOVE VEE)
INPUT CURRENT (µA)
200 400
-3
-5
-9
-2
-4
-6
Figure 4. Enable Logic-Low Input Current vs. Enable Logic-
Low Threshold with 10kΩSeries Resistor
Driving large capacitive loads increases the chance of
oscillations occurring in most amplifier circuits. This is
especially true for circuits with high loop gains, such as
voltage followers. The buffer’s output resistance and the
load capacitor combine to add a pole and excess phase
to the loop response. If the frequency of this pole is low
enough to interfere with the loop response and degrade
phase margin sufficiently, oscillations can occur.
A second problem when driving capacitive loads
results from the amplifier’s output impedance, which
looks inductive at high frequencies. This inductance
forms an L-C resonant circuit with the capacitive load,
which causes peaking in the frequency response and
degrades the amplifier’s gain margin.
Figure 6 shows the devices’ frequency response under
different capacitive loads. To drive loads with greater
than 20pF of capacitance or to settle out some of
the peaking, the output requires an isolation resistor
like the one shown in Figure 7. Figure 8 is a graph of
the Optimal Isolation Resistor vs. Load Capacitance.
Figure 9 shows the frequency response of the
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
when driving capacitive loads with a 27Ωisolation
resistor.
Coaxial cables and other transmission lines are easily
driven when properly terminated at both ends with their
characteristic impedance. Driving back-terminated
transmission lines essentially eliminates the lines’
capacitance.
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
______________________________________________________________________________________ 11
MAX4214
MAX4215
MAX4217
MAX4219
MAX4222
500Ω500Ω
OUT
IN-
IN+
Figure 5. Input Protection Circuit
6
-4
100k 10M 100M1M 1G
-2
FREQUENCY (Hz)
NORMALIZED GAIN (dB)
0
2
4
5
-3
-1
1
3
CL = 10pF
CL = 5pF
CL = 15pF
Figure 6. Small-Signal Gain vs. Frequency with Load
Capacitance and No Isolation Resistor
500Ω500Ω
RISO
CL
VOUT
VIN
RTIN
50Ω
MAX42_ _
Figure 7. Driving a Capacitive Load Through an Isolation
Resistor
14
16
12
10
6
4
2
8
0
CLOAD (pF)
0 50 100 150 200 250
RISO (Ω)
Figure 8. Isolation Resistance vs. Capacitive Load
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
12 ______________________________________________________________________________________
MAX4214
75Ω
500Ω
GAIN OF +2 VIDEO/RF CABLE DRIVER
500Ω
VOUT
IN-
IN+
75Ω
_________Typical Application Circuit
3
-7
100k 10M 100M1M 1G
-5
FREQUENCY (Hz)
NORMALIZED GAIN (dB)
-3
-1
1
2
-6
-4
-2
0
CL = 68pF
RISO = 27Ω
CL = 120pF
CL = 47pF
Figure 9. Small-Signal Gain vs. Frequency with Load
Capacitance and 27ΩIsolation Resistor
Chip Information
MAX4214 TRANSISTOR COUNT: 95
MAX4215 TRANSISTOR COUNT: 95
MAX4217 TRANSISTOR COUNT: 190
MAX4219 TRANSISTOR COUNT: 299
MAX4222 TRANSISTOR COUNT: 362
SUBSTRATE CONNECTED TO VEE
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
______________________________________________________________________________________ 13
OUT
N.C.
VEE
1
2
8
7
EN
VCC
IN-
IN+
N.C.
SO/µMAX
TOP VIEW
3
4
6
5
MAX4215
INB-
INB+
VEE
1
2
8
7
VCC
OUTB
INA-
INA+
OUTA
SO/µMAX
3
4
6
5
MAX4217
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTC
INC-
INC+
VEE
VCC
ENB
ENC
ENA
MAX4219
INB+
INB-
OUTBOUTA
INA-
INA+
SO
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTD
IND-
IND+
VEE
VCC
INA+
INA-
OUTA
MAX4222
INC+
INC-
OUTCOUTB
INB-
INB+
SO
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
ENA OUTC
INC-
INC+
VEE
INB+
INB-
OUTB
N.C.
MAX4219
QSOP
ENC
ENB
INA-
VCC
INA+
OUTA
N.C.
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OUTA OUTD
IND-
IND+
VEE
INC+
INC-
OUTC
N.C.
MAX4222
QSOP
INA-
INA+
INB-
VCC
INB+
OUTB
N.C.
_______________________________________________Pin Configurations (continued)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
14 ______________________________________________________________________________________
__________________________________________________Tape-and-Reel Information
SOT5L.EPS
P
D
E
F
W
P2
P0
D1
A0
B0
K0
t
±0.102
±0.102
A0
B0
D
D1
3.200
3.099
1.499
0.991
±0.102
±0.051
±0.102
±0.102
1.753
3.505
1.397
3.988
E
F
K0
P
+0.102
+0.000
NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.
+0.305
-0.102
+0.254
+0.000
P0 3.988 ±0.102
P010 40.005 ±0.203
P2 2.007 ±0.051
t 0.254 ±0.127
W 8.001
5 SOT23-5
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.)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
______________________________________________________________________________________ 15
8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036 J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2 A1
c
eb
A
L
FRONT VIEW SIDE VIEW
E H
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
1
TOP VIEW
D
8
A2 0.030
BOTTOM VIEW
16∞
S
b
L
H
E
D
e
c
0∞
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6∞0∞
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
SOICN.EPS
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.)
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
High-Speed, Single-Supply, Gain of 2,
Closed-Loop, Rail-to-Rail Buffers with Enable
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.
QSOP.EPS
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.)
