19-1543; Rev 0; 10/99
N KIT AVA
EVALUATIO
ILABLE
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
General Description
The MAX4444/MAX4445 differential line receivers offer
unparalleled high-speed, low-distortion performance.
Using a three op amp instrumentation amplifier archi-
tecture, these ICs have symmetrical differential inputs
and a single-ended output. They operate from ±5V
supplies and are capable of driving a 100Ω load to
±3.7V. The MAX4444 has an internally set closed-loop
gain of +2V/V, while the MAX4445 is compensated for
gains of +2V/V or greater, set by an external resistor. A
low-power enable mode reduces current consumption
to 3.5mA.
Using current-feedback techniques, the MAX4444/
MAX4445 achieve a 550MHz bandwidth while maintain-
ing up to a 5000V/µs slew rate. Excellent differential
gain/phase and noise specifications make these ampli-
fiers ideal for a wide variety of video and RF signal-pro-
cessing applications. An evaluation kit is available to
speed design.
o
5000V/µs Slew Rate (MAX4444)
o
+2V/V Internally Fixed Gain (MAX4444)
o
External Gain Selection
(MAX4445, A
VCL
≥
+2V/V)
o
550MHz -3dB Bandwidth
o
-60dB SFDR at 5MHz
o
Low Differential Gain/Phase: 0.07%/0.05°
o
Low Noise: 25nV/
√
Hz
at f
IN
= 100kHz
o
Low-Power Disable Mode Reduces Quiescent
Current to 3.5mA
Features
MAX4444/MAX4445
Applications
Differential-to-Single-Ended Conversion
Twisted-Pair to Coaxial Converter
High-Speed Instrumentation Amplifier
Data Acquisition
Medical Instrumentation
High-Speed Differential Line Receiver
PART
MAX4444ESE
MAX4445ESE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
Typical Operating Circuit
+5V
Pin Configuration
TOP VIEW
V
CC
1
16 GND
15 OUT
14 V
EE
0.1µF
IN+
SIGNAL
INPUT
V
CC
2
IN- 3
EN
V
CC
75Ω
OUT
V
EE
75Ω
OUTPUT
N.C. (RG) 4
N.C. (RG) 5
IN+ 6
V
EE
7
MAX4444
MAX4445
13 V
EE
12 V
EE
11 V
EE
10 REF
9
EN
MAX4444
IN- REF
GND
0.1µF
V
EE
8
SO
-5V
( ) ARE FOR MAX4445 ONLY.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
MAX4444/MAX4445
ABSOLUTE MAXIMUM RATINGS
V
CC
to V
EE
...........................................................................+12V
Voltage on IN+, IN-, EN, OUT+,
OUT-, RG, REF..............................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Current Into IN+, IN-, RG, EN .............................................20mA
Output Short-Circuit Duration ...........................Indefinite to GND
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Narrow SO (derate 20mW/°C above +70°C) ...1600mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
EN
=
≥2V,
V
CM
= 0 , R
L
=
∞,
REF = GND, A
VCL
= +2V/V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
Operating Supply Voltage
Range
Input Common-Mode Voltage
Range
Differential Input Voltage Range
Input Offset Voltage
Input Offset-Voltage
Temperature Coefficient
Input Bias Current
Input Offset Current
Differential Input Resistance
Gain
Gain Error
Gain-Error Drift
Output Voltage Swing
Output Current Drive
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
Disable Output Resistance
EN Logic Low Threshold
EN Logic High Threshold
EN Logic Input Low Current
EN Logic Input High Current
Quiescent Current
V
OUT
I
OUT
PSRR
CMRR
V
IL
V
IH
I
IL
I
IH
I
Q
V
EN
= 0
V
EN
= 5V
V
IN
= 0, V
EN
= 5V
V
IN
= 0, V
EN
= 0
2
2.2
2.6
41
3.5
10
10
55
5.5
V
CM
V
DIFF
V
OS
TC
VOS
I
B
I
OS
R
IN
A
V
-2.9V
≤
V
IN
≤
+2.9V
-2.9V
≤
V
CM
≤
+2.9V
-3V
≤
V
OUT
≤
+3V
-3V
≤
V
OUT
≤
+3V,
R
L
= 100Ω
R
L
= 100Ω
R
L
= 100Ω
R
L
= 50Ω
R
L
= 30Ω
V
S
= ±4.5V to ±5.5V
-2.9V
≤
V
CM
≤
+2.9V
±3.4
±3.3
90
53
40
MAX4444
MAX4445
MAX4444
MAX4445
SYMBOL
CONDITIONS
Guaranteed by PSRR test
Guaranteed by CMRR test
Guaranteed by output swing test
MIN
±4.5
-2.9
-1.7
15
12
10
55
TYP
MAX
±5.5
2.9
1.7
65
UNITS
V
V
V
mV
µV/°C
µA
µA
kΩ
V/V
%
%/°C
V
mA
dB
dB
kΩ
0.8
V
V
µA
µA
mA
0.25
45
82
170
2
(1 + 600/R
G
)
0.5
2
2.6
0.003
±3.7
±3.6
120
70
55
1.8
8
R
OUT(OFF)
V
EN
= 0, -3.5V
≤
V
OUT
≤
+3.5V, MAX4444
2
_______________________________________________________________________________________
Ultra-High Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, R
L
= 100Ω, REF = GND, A
VCL
= +2V/V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Small-Signal -3dB Bandwidth
Large-Signal -3dB Bandwidth
0.1dB Gain Flatness
SYMBOL
BW
SS
BW
LS
V
OUT
= 2Vp-p
V
OUT
= 100mVp-p
V
OUT
= 4V step
Slew Rate (Note 1)
SR
V
OUT
= 2V step
V
OUT
= 1V step
V
OUT
= 0.5V step
Rise Time (Note 1)
t
RISE
V
OUT
= 4V step
Fall Time (Note 1)
t
FALL
V
OUT
= 2V step
V
OUT
= 1V step
V
OUT
= 0.5V step
Settling Time
Settle to 0.1% , V
OUT
= 2V step
f
C
= 100kHz
SFDR
V
OUT
= 2Vp-p
f
C
= 5MHz
f
C
= 20MHz
f
C
= 100MHz
f
C
= 100kHz
2nd-Harmonic Distortion
V
OUT
= 2Vp-p
f
C
= 5MHz
f
C
= 20MHz
f
C
= 100MHz
f
C
= 100kHz
3rd-Harmonic Distortion
V
OUT
= 2Vp-p
f
C
= 5MHz
f
C
= 20MHz
f
C
= 100MHz
Differential Phase Error
Differential Gain Error
Input Noise Voltage Density
Input Noise Current Density
Output Impedance
Enable Time
Disable Time
Power-Up Time
Power-Down Time
DP
DG
e
N
i
N
Z
OUT
t
SHDN(ON)
t
SHDN(OFF)
t
ON
t
OFF
NTSC, R
L
= 150Ω
NTSC, R
L
= 150Ω
f = 100kHz (Note 2)
f = 100kHz
f = 10MHz
V
IN
= 1V, V
OUT
settle to within 10%
V
IN
= 1V, V
OUT
settle to within 10%
V
IN
= 1V, V
OUT
settle to within 10%
V
IN
= 1V, V
OUT
settle to within 10%
MAX4444
MAX4445
MAX4444
MAX4445
CONDITION
V
OUT
= 100mVp-p
MIN
TYP
550
500
80
5000
3800
2400
2000
1200
600
650
825
700
700
700
12
-65
-60
-55
-35
-65
-62
-50
-35
-90
-72
-62
-55
0.05
0.07
25
1.8
0.7
80
200
0.5
0.3
degrees
%
nV/√Hz
pA/√Hz
Ω
ns
ns
µs
µs
dBc
dBc
dBc
ns
ps
ps
V/µs
V/µs
MAX
UNITS
MHz
MHz
MHz
MAX4444/MAX4445
Note 1:
Input step voltage has <100ps rise (fall) time. Measured at the output from 10% to 90% (90% to 10%) level.
Note 2:
Includes the current noise contribution through the on-die feedback resistor.
_______________________________________________________________________________________
3
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
MAX4444/MAX4445
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, V
IN
= V
IN
+ - V
IN
-, R
L
= 100Ω, REF = GND, A
V
= +2V/V, T
A
= +25°C, unless otherwise noted.)
MAX4444
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc01
MAX4445
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc02
MAX4444
GAIN FLATNESS vs. FREQUENCY
0.8
0.7
0.6
GAIN (dB)
0.5
0.4
0.3
0.2
0.1
V
OUT
= 100mVp-p
MAX4444toc03
5
4
3
2
GAIN (dB)
4
3
2
1
GAIN (dB)
0
-1
-2
-3
-4
0.9
1
0
-1
-2
-3
-4
-5
100k
1M
10M
FREQUENCY (Hz)
100M
1G
V
OUT
= 100mVp-p
-5
-6
100k
V
OUT
= 100mVp-p
1M
10M
FREQUENCY (Hz)
100M
1G
0
-0.1
100k
1M
10M
FREQUENCY (Hz)
100M
1G
MAX4445
GAIN FLATNESS vs. FREQUENCY
MAX4445toc04
MAX4444
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4444toc05
MAX4445
LARGE-SIGNAL GAIN vs. FREQUENCY
3
2
1
GAIN (dB)
0
-1
-2
-3
-4
-5
-6
V
OUT
= 2Vp-p
MAX4445toc06
0.6
0.5
0.4
0.3
GAIN (dB)
V
OUT
= 100mVp-p
5
4
3
2
GAIN (dB)
1
0
-1
-2
-3
-4
-5
V
OUT
= 2Vp-p
4
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
MAX4444
SMALL-SIGNAL PULSE RESPONSE
MAX4444toc07
MAX4445
SMALL-SIGNAL PULSE RESPONSE
MAX4445toc08
MAX4444
LARGE-SIGNAL PULSE RESPONSE
MAX4444toc09
INPUT
25mV/div
INPUT
25mV/div
INPUT
250mV/div
OUTPUT
50mV/div
OUTPUT
50mV/div
OUTPUT
500mV/div
5ns/div
5ns/div
5ns/div
4
_______________________________________________________________________________________
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, V
IN
= V
IN
+ - V
IN
-, R
L
= 100Ω, REF = GND, A
V
= +2V/V, T
A
= +25°C, unless otherwise noted.)
MAX4445
LARGE-SIGNAL PULSE RESPONSE
MAX4445toc10
MAX4444/MAX4445
SLEW RATE vs. OUTPUT VOLTAGE SWING
MAX4444/45toc11
MAX4444
DIFFERENTIAL GAIN AND PHASE
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
0
IRE
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
0
IRE
100
PHASE (degrees)
GAIN (%)
MAX4444toc12
6000
5000
SLEW RATE (V/µs)
4000
3000
2000
MAX4445
1000
0
MAX4444
INPUT
250mV/div
100
OUTPUT
500mV/div
5ns/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT VOLTAGE SWING (Vp-p)
MAX4444
HARMONIC DISTORTION
vs. FREQUENCY
MAX4444toc13
MAX4445
HARMONIC DISTORTION
vs. FREQUENCY
MAX4445toc14
MAX4444
HARMONIC DISTORTION
vs. LOAD RESISTANCE
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
2nd HARMONIC
3rd HARMONIC
f
C
= 5MHz, V
OUT
= 2Vp-p
MAX4444toc15
0
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
-80
-90
-100
500k
1M
10M
FREQUENCY (Hz)
3rd HARMONIC
2nd HARMONIC
V
OUT
= 2Vp-p
0
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
-80
-90
-100
3rd HARMONIC
2nd HARMONIC
V
OUT
= 2Vp-p
0
-80
-90
-100
100M
500k
1M
10M
FREQUENCY (Hz)
100M
100
1k
LOAD RESISTANCE (Ω)
10k
MAX4445
HARMONIC DISTORTION
vs. LOAD RESISTANCE
MAX4444toc16
MAX4444
HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
MAX4444toc17
MAX4445
HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
-80
-90
-100
2nd HARMONIC
3rd HARMONIC
f
C
= 5MHz
MAX4445toc18
0
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
-80
-90
-100
100
1k
LOAD RESISTANCE (Ω)
3rd HARMONIC
2nd HARMONIC
f
C
= 5MHz, V
OUT
= 2Vp-p
0
-10
-20
DISTORTION (dB)
-30
-40
-50
-60
-70
-80
-90
-100
3rd HARMONIC
2nd HARMONIC
f
C
= 5MHz
0
10k
0.5
1.5
2.5
3.5
4.5
5.5
6.5
0.5
1.5
2.5
3.5
4.5
5.5
6.5
OUTPUT VOLTAGE SWING (Vp-p)
OUTPUT VOLTAGE SWING (Vp-p)
_______________________________________________________________________________________
5
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