Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
SELECTOR GUIDE
PART NUMBER
SINGLE
LTC6400-8
LTC6400-14
LTC6400-20
LTC6400-26
LTC6401-8
LTC6401-14
LTC6401-20
LTC6401-26
LTC6421-20
LTC6420-20
DUAL
GAIN
(dB)
8
14
20
26
8
14
20
26
GAIN
(V/V)
2.5
5
10
20
2.5
5
10
20
Z
IN
(DIFFERENTIAL)
(Ω)
400
200
200
50
400
200
200
50
COMMENT
Lowest Distortion
Lowest Distortion
Lowest Distortion
Lowest Distortion
Lowest Power
Lowest Power
Lowest Power
Lowest Power
V+ A
20 19 18 17
642120fa
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LTC6421-20
DC ELECTRICAL CHARACTERISTICS
+
The
l
–
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V = 3V, V = 0V, +IN = –IN = V
OCM
= 1.25V,
ENABLE
= 0V, No R
L
unless
otherwise noted.
PARAMETER
Gain
Gain Matching
Gain Temperature Drift
Output Swing Low (V
OCM
= 1.5V)
Output Swing High (V
OCM
= 1.5V)
Maximum Differential Output Swing
Output Current Drive
Input Offset Voltage
Input Offset Voltage Drift
Input Common Mode Voltage Range, MIN
Input Common Mode Voltage Range, MAX
Input Resistance (+IN, –IN)
Input Impedance Matching
Input Capacitance (+IN, –IN)
Output Resistance (+OUT, –OUT)
Common Mode Rejection Ratio
Common Mode Gain
Output Common Mode Range, MIN
Output Common Mode Range, MAX
Common Mode Offset Voltage
Common Mode Offset Voltage Drift
V
OCM
Input Current
ENABLEx
Input Low Voltage
ENABLEx
Input High Voltage
ENABLEx
Input Current
Power Supply
V
S
I
S
I
SHDN
PSRR
Operating Supply Range
Supply Current
Shutdown Supply Current
Power Supply Rejection Ratio (Differential
Outputs)
ENABLEx
≤ 0.8V; per Amplifier
ENABLEx
≥ 2.4V; per Amplifier,
Inputs Floating
V
+
= 2.85V to 3.5V
l
l
l
l
SYMBOL
G
DIFF
ΔG
TC
GAIN
V
SWINGMIN
V
SWINGMAX
V
OUTDIFFMAX
I
OUT
V
OS
TCV
OS
I
VRMIN
I
VRMAX
R
INDIFF
ΔR
IN
C
INDIFF
R
OUTDIFF
CMRR
G
CM
V
OCMMIN
V
OCMMAX
V
OSCM
TCV
OSCM
IV
OCM
V
IL
V
IH
CONDITIONS
V
IN
= ±100mV Differential
Channel-to-Channel
V
IN
= ±100mV Differential
Each Output, V
IN
= ±400mV Differential
Each Output, V
IN
= ±400mV Differential
2V
P-P, OUT
(Note 10)
Differential
Differential
l
l
l
l
l
l
l
l
l
l
l
MIN
19.6
TYP
20
±0.1
0.0015
0.1
MAX
20.4
±0.25
0.25
UNITS
dB
dB
dB/°C
V
V
V
P-P
mA
Input/Output Characteristic
2.75
5
10
–2
2.9
5.6
±0.4
1.4
1
2
mV
μV/°C
V
V
Ω
%
pF
Ω
dB
V/V
1.6
170
200
±1
1
20
45
25
68
1
230
±2.5
36
Differential
Channel-to-Channel
Differential, Includes Parasitic
Differential
Input Common Mode Voltage 1V to 1.6V
V
OCM
= 1V to 1.6V
l
l
l
l
Output Common Mode Voltage Control
l
l
1
1.6
–10
–15
±2
6
–3
0
0.8
2.4
1.5
2.85
3
40
1
55
86
±0.5
3
3.5
50
3
10
V
V
mV
μV/°C
μA
V
V
μA
μA
V
mA
mA
dB
V
OCM
= 1.25V to 1.5V
l
l
l
l
l
l
l
ENABLEx
Pins (x = A, B)
ENABLEx
≤
0.8V
ENABLEx
≥
2.4V
642120fa
3
LTC6421-20
AC ELECTRICAL CHARACTERISTICS
noted.
ΔG
ΔP
–3dBBW
0.5dBBW
0.1dBBW
NF
e
IN
e
ON
1/f
SR
t
S1%
t
OVDR
P
1dB
t
ON
t
OFF
–3dBBW
VOCM
IMD
3
OIP
3
IIP
3
HD
2
HD
3
SYMBOL
PARAMETER
Gain Matching
Phase Matching
Channel Separation (Note 8)
–3dB Bandwidth
Bandwidth for 0.5dB Flatness
Bandwidth for 0.1dB Flatness
Noise Figure
Input Referred Voltage Noise Density
1/f Noise Corner
Slew Rate
1% Settling Time
Overdrive Recovery Time
1dB Compression Point
Turn-On Time
Turn-Off Time
V
OCM
Pin Small Signal –3dB BW
3rd Order Intermodulation Distortion
3rd Order Output Intercept
3rd Order Input Intercept
2nd Order Harmonic Distortion
3rd Order Harmonic Distortion
Differential (Note 6)
2V
P-P, OUT
(Note 6)
1.9V
P-P, OUT
(Note 6) Single Ended
R
L
= 375Ω (Notes 5, 7), f = 100MHz
+OUT, –OUT Within 10% of Final Values
I
CC
Falls to 10% of Nominal
0.1V
P-P
at V
OCM
, Measured Single-Ended at
Output (Note 6)
f = 100MHz (1MHz Spacing),
V
OUT
= 2V
P-P
Composite
f = 100MHz (Note 7)
f = 100MHz (Z
IN
= 50Ω)
f = 100MHz (Z
IN
= 200Ω)
f = 100MHz, V
OUT
= 2V
P-P
f = 100MHz, V
OUT
= 2V
P-P
The
l
denotes the specifications which apply over the full operating
+
= 3V, V
–
= 0V, V
temperature range, otherwise specifications are at T
A
= 25°C. V
OCM
= 1.25V,
ENABLE
= 0V, No R
L
unless otherwise
CONDITIONS
f = 100MHz (Note 9)
f = 100MHz
f = 100MHz
200mV
P-P, OUT
(Note 6)
200mV
P-P, OUT
(Note 6)
200mV
P-P, OUT
(Note 6)
R
L
= 375Ω (Note 5), f = 100MHz
Includes Resistors (Short Inputs), f = 100MHz
l
MIN
TYP
±0.1
±0.2
80
1.3
250
130
6.2
2.2
22
12.5
4500
2
7
18
80
150
15
–76
42
22
16
–74
–78
MAX
±0.25
UNITS
dB
deg
dB
GHz
MHz
MHz
dB
nV/√Hz
nV/√Hz
kHz
V/μs
ns
ns
dBm
ns
ns
MHz
dBc
dBc
dBc
dBc
dBc
dBc
Output Referred Voltage Noise Density Includes Resistors (Short Inputs), f = 100MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Input pins (+IN, –IN) are protected by steering diodes to either
supply. If the inputs go beyond either supply rail, the input current should
be limited to less than 10mA.
Note 3:
The LTC6421C and LTC6421I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 4:
The LTC6421C is guaranteed to meet specified performance from
0°C to 70°C. It is designed, characterized and expected to meet specified
performance from –40°C to 85°C but is not tested or QA sampled at these
temperatures. The LTC6421I is guaranteed to meet specified performance
from –40°C to 85°C.
Note 5:
Input and output baluns used. See Test Circuit A.
Note 6:
Measured using Test Circuit B. R
L
= 87.5Ω on each output.
Note 7:
Since the LTC6421-20 is a feedback amplifier with low output
impedance, a resistive load is not required when driving an AD converter.
Therefore, typical output power is very small. In order to compare the
LTC6421-20 with amplifiers that require 50Ω output load, the output
voltage swing driving a given R
L
is converted to OIP
3
and P
1dB
as if it were
driving a 50Ω load. Using this modified convention, 2V
P-P
is by definition
equal to 10dBm, regardless of actual R
L
.
Note 8:
Channel separation (the inverse of crosstalk) is measured by
driving a signal into one input, while terminating the other input. Channel
separation is the ratio of the resulting output signal at the driven channel
to the channel that is not driven.
Note 9:
Not production tested. Guaranteed by design and by correlation to
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