Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
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.
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 100
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.
Applications
Differential-to-Single-Ended Conversion
Twisted-Pair to Coaxial Converter
High-Speed Instrumentation Amplifier
Data Acquisition
Medical Instrumentation
High-Speed Differential Line Receiver
Features
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
MAX4444/MAX4445
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V
CC
GND
OUT
V
EE
V
EE
V
EE
V
EE
REF
EN
TOP VIEW
MAX4444
MAX4445
SO
V
CC
IN-
IN+
N.C. (RG)
N.C. (RG)
V
EE
V
EE
( ) ARE FOR MAX4445 ONLY.
75
75
0.1
µ
F
GND
IN-
IN+
SIGNAL
INPUT
OUTPUT
REF
EN
V
EE
V
CC
+5V
-5V
OUT
MAX4444
0.1
µ
F
Typical Operating Circuit
19-1543; Rev 0; 10/99
EVALUATION KIT AVAILABLE
Pin Configuration
Ordering Information
PART
MAX4444
ESE
MAX4445
ESE
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
MAX4444/MAX4445
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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
V
EN
= 0
Guaranteed by output swing test
V
EN
= 0, -3.5V
V
OUT
+3.5V, MAX4444
Guaranteed by CMRR test
-2.9V
V
CM
+2.9V
V
S
= ±4.5V to ±5.5V
R
L
= 30
-3V
V
OUT
+3V
R
L
= 50
R
L
= 100
MAX4444
-2.9V
V
IN
+2.9V
R
L
= 100
-3V
V
OUT
+3V,
R
L
= 100
CONDITIONS
µA
2.2
10
I
IL
EN Logic Input Low Current
V
2
V
IH
EN Logic High Threshold
V
0.8
V
IL
EN Logic Low Threshold
k
1.8
R
OUT(OFF)
Disable Output Resistance
dB
40
55
CMRR
Common-Mode Rejection Ratio
dB
53
70
PSRR
Power-Supply Rejection Ratio
mA
90
120
I
OUT
Output Current Drive
MAX4445
±3.3
±3.6
V
±3.4
±3.7
V
OUT
Output Voltage Swing
%/°C
0.003
Gain-Error Drift
2.6
8
V
-1.7
1.7
V
DIFF
Differential Input Voltage Range
V
-2.9
2.9
V
CM
Input Common-Mode Voltage
Range
(1 + 600/R
G
)
2
A
V
Gain
170
k
82
R
IN
Differential Input Resistance
mV
15
65
V
OS
Input Offset Voltage
µV/°C
12
TC
VOS
Input Offset-Voltage
Temperature Coefficient
µA
10
55
I
B
Input Bias Current
µA
0.25
45
I
OS
Input Offset Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
IN
= 0, V
EN
= 0
V
IN
= 0, V
EN
= 5V
V
EN
= 5V
3.5
5.5
mA
41
55
I
Q
Quiescent Current
µA
2.6
10
I
IH
EN Logic Input High Current
%
-2.9V
V
CM
+2.9V
V/V
Guaranteed by PSRR test
V
±4.5
±5.5
Operating Supply Voltage
Range
0.5
2
Gain Error
MAX4445
MAX4444
V/µs
MAX4444/MAX4445
Ultra-High Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
_______________________________________________________________________________________
3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, R
L
= 100
, REF = GND, A
VCL
= +2V/V, T
A
= +25°C, unless otherwise noted.)
V
OUT
= 2Vp-p
Settle to 0.1% , V
OUT
= 2V step
V
OUT
= 1V step
V
OUT
= 2Vp-p
V
OUT
= 100mVp-p
V
OUT
= 2V step
CONDITION
-35
-55
dBc
-65
SFDR
ns
12
Settling Time
650
MHz
BW
LS
Large-Signal -3dB Bandwidth
MHz
550
BW
SS
Small-Signal -3dB Bandwidth
ps
1200
500
MHz
80
0.1dB Gain Flatness
5000
2400
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
-60
t
RISE
Rise Time (Note 1)
f = 100kHz
f = 100kHz (Note 2)
NTSC, R
L
= 150
pA/
Hz
1.8
i
N
Input Noise Current Density
nV/
Hz
25
e
N
Input Noise Voltage Density
degrees
0.05
DP
Differential Phase Error
NTSC, R
L
= 150
%
0.07
DG
Differential Gain Error
V
OUT
= 100mVp-p
f
C
= 100kHz
f
C
= 100MHz
f
C
= 20MHz
f
C
= 5MHz
V
OUT
= 2Vp-p
f
C
= 100MHz
-35
f
C
= 100kHz
f
C
= 20MHz
f
C
= 5MHz
-50
dBc
-65
2nd-Harmonic Distortion
-62
V
OUT
= 2Vp-p
f
C
= 100MHz
-55
f
C
= 100kHz
f
C
= 20MHz
f
C
= 5MHz
-62
dBc
-90
3rd-Harmonic Distortion
-72
V
OUT
= 4V step
V
OUT
= 0.5V step
V
OUT
= 1V step
V
OUT
= 2V step
700
700
700
ps
825
t
FALL
Fall Time (Note 1)
V/µs
SR
Slew Rate (Note 1)
V
OUT
= 0.5V step
600
MAX4444
V
OUT
= 4V step
MAX4445
MAX4444
MAX4445
3800
2000
V
IN
= 1V, V
OUT
settle to within 10%
V
IN
= 1V, V
OUT
settle to within 10%
ns
200
t
SHDN(OFF)
Disable Time
ns
80
t
SHDN(ON)
Enable Time
f = 10MHz
0.7
Z
OUT
Output Impedance
V
IN
= 1V, V
OUT
settle to within 10%
V
IN
= 1V, V
OUT
settle to within 10%
µs
0.3
t
OFF
Power-Down Time
µs
0.5
t
ON
Power-Up Time
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.
INPUT
25mV/div
OUTPUT
50mV/div
5ns/div
MAX4444
SMALL-SIGNAL PULSE RESPONSE
MAX4444toc07
INPUT
25mV/div
OUTPUT
50mV/div
5ns/div
MAX4445
SMALL-SIGNAL PULSE RESPONSE
MAX4445toc08
INPUT
250mV/div
OUTPUT
500mV/div
5ns/div
MAX4444
LARGE-SIGNAL PULSE RESPONSE
MAX4444toc09
MAX4444/MAX4445
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, V
IN
= V
IN
+ - V
IN
-, R
L
= 100
, REF = GND, A
V
= +2V/V, T
A
= +25°C, unless otherwise noted.)
100M
1G
-5
-4
-3
-2
-1
0
1
3
2
4
5
100k
1M
10M
MAX4444
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc01
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 100mVp-p
100M
1G
-6
-5
-4
-3
-2
-1
0
2
1
3
4
100k
1M
10M
MAX4445
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4444toc02
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 100mVp-p
100M
1G
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.7
0.6
0.8
0.9
100k
1M
10M
MAX4444
GAIN FLATNESS vs. FREQUENCY
MAX4444toc03
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 100mVp-p
100M
1G
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.4
0.3
0.5
0.6
100k
1M
10M
MAX4445
GAIN FLATNESS vs. FREQUENCY
MAX4445toc04
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 100mVp-p
100M
1G
-5
-4
-3
-2
-1
0
1
3
2
4
5
100k
1M
10M
MAX4444
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4444toc05
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 2Vp-p
100M
1G
-6
-5
-4
-3
-2
-1
0
2
1
3
4
100k
1M
10M
MAX4445
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4445toc06
FREQUENCY (Hz)
GAIN (dB)
V
OUT
= 2Vp-p
MAX4444/MAX4445
Ultra-High-Speed, Low-Distortion, Differential-
to-Single-Ended Line Receivers with Enable
_______________________________________________________________________________________
5
INPUT
250mV/div
OUTPUT
500mV/div
5ns/div
MAX4445
LARGE-SIGNAL PULSE RESPONSE
MAX4445toc10
0
1000
2000
3000
4000
5000
6000
0
1.0
0.5
1.5 2.0 2.5 3.0 3.5 4.0 4.5
SLEW RATE vs. OUTPUT VOLTAGE SWING
MAX4444/45toc11
OUTPUT VOLTAGE SWING (Vp-p)
SLEW RATE (V/
µ
s)
MAX4444
MAX4445
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
0
100
100
MAX4444
DIFFERENTIAL GAIN AND PHASE
IRE
IRE
PHASE (degrees)
GAIN (%)
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
MAX4444toc12
0
0
-10
-20
-30
-100
10M
100M
MAX4444
HARMONIC DISTORTION
vs. FREQUENCY
-40
-50
-60
-70
-80
-90
MAX4444toc13
FREQUENCY (Hz)
DISTORTION (dB)
500k
1M
V
OUT
= 2Vp-p
2nd HARMONIC
3rd HARMONIC
0
-10
-20
-30
-100
10M
100M
MAX4445
HARMONIC DISTORTION
vs. FREQUENCY
-40
-50
-60
-70
-80
-90
MAX4445toc14
FREQUENCY (Hz)
DISTORTION (dB)
500k
1M
V
OUT
= 2Vp-p
2nd HARMONIC
3rd HARMONIC
0
-100
100
1k
10k
MAX4444
HARMONIC DISTORTION
vs. LOAD RESISTANCE
-80
-90
MAX4444toc15
LOAD RESISTANCE (
)
DISTORTION (dB)
-60
-70
-40
-30
-50
-20
-10
f
C
= 5MHz, V
OUT
= 2Vp-p
2nd HARMONIC
3rd HARMONIC
0
-100
100
1k
10k
MAX4445
HARMONIC DISTORTION
vs. LOAD RESISTANCE
-80
-90
MAX4444toc16
LOAD RESISTANCE (
)
DISTORTION (dB)
-60
-70
-40
-30
-50
-20
-10
f
C
= 5MHz, V
OUT
= 2Vp-p
2nd HARMONIC
3rd HARMONIC
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.5
1.5
2.5
3.5
4.5
5.5
6.5
MAX4444
HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
MAX4444toc17
OUTPUT VOLTAGE SWING (Vp-p)
DISTORTION (dB)
f
C
= 5MHz
2nd HARMONIC
3rd HARMONIC
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.5
1.5
2.5
3.5
4.5
5.5
6.5
MAX4445
HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
MAX4445toc18
OUTPUT VOLTAGE SWING (Vp-p)
DISTORTION (dB)
f
C
= 5MHz
2nd HARMONIC
3rd HARMONIC
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= -5V, V
EN
= 5V, V
IN
= V
IN
+ - V
IN
-, R
L
= 100
, REF = GND, A
V
= +2V/V, T
A
= +25°C, unless otherwise noted.)
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