targeted at processing signals from DC to 300MHz. The
part has been specifically designed to drive 12-, 14- and
16-bit ADCs with low noise and low distortion, but can also
be used as a general-purpose broadband gain block.
The LTC6400-20 is easy to use, with minimal support
circuitry required. The output common mode voltage is
set using an external pin, independent of the inputs, which
eliminates the need for transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fixed
at 20dB (10V/V).
The LTC6400-20 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6400-20 is packaged in a compact 16-lead
3mm
×
3mm QFN package and operates over the –40°C
to 85°C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
■
■
1.8GHz –3dB Bandwidth
Fixed Gain of 10V/V (20dB)
–94dBc IMD
3
at 70MHz (Equivalent OIP3 = 51dBm)
–65dBc IMD
3
at 300MHz (Equivalent OIP3 = 36.5dBm)
1nV/√Hz Internal Op Amp Noise
2.1nV/√Hz Total Input Noise
6.2dB Noise Figure
Differential Inputs and Outputs
200Ω Input Impedance
2.85V to 3.5V Supply Voltage
90mA Supply Current (270mW)
1V to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.4V
P-P
Small 16-Lead 3mm
×
3mm
×
0.75mm QFN Package
APPLICATIONS
■
■
■
■
■
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
TYPICAL APPLICATION
Single-Ended to Differential ADC Driver
3.3V
1.25V
0.1μF
1000pF
V
+
0.1μF
INPUT
66.5Ω
0.1μF
+IN
V
OCM
+OUT
+OUTF
LTC6400-20
–OUTF
–OUT
–IN
V–
ENABLE
20dB GAIN
10Ω
AIN
+
V
CM
LTC2208
AIN
–
10Ω
LTC2208 130Msps
16-Bit ADC
640020 TA01a
Equivalent Output IP3 vs
Frequency
60
50
0.1μF
OUTPUT IP3 (dBm)
40
30
20
10
0
0
50
100
150
200
FREQUENCY (MHz)
250
300
(NOTE 7)
V
DD
29Ω
640020 TA01b
640020f
1
LTC6400-20
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
–IN
–IN
+IN
7
+OUTF
+IN
12 V–
17
11 ENABLE
10 V
+
9 V–
8
+OUT
16 15 14 13
V
+
V
+
1
Supply Voltage (V
+
– V
–
)..........................................3.6V
Input Current (Note 2)..........................................±10mA
Operating Temperature Range
(Note 3) ............................................... –40°C to 85°C
Specified Temperature Range
(Note 4) ............................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Maximum Junction Temperature .......................... 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
V
OCM
2
3
V– 4
5
–OUT
6
UD PACKAGE
16-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 68°C/W,
θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS V
–
, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC6400CUD-20#PBF
LTC6400IUD-20#PBF
TAPE AND REEL
LTC6400CUD-20#TRPBF
LTC6400IUD-20#TRPBF
PART MARKING*
LCCS
LCCS
PACKAGE DESCRIPTION
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
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/
LTC6400 AND LTC6401 SELECTOR GUIDE
PART NUMBER
LTC6400-20
LTC6401-20
GAIN
(dB)
20
20
GAIN
(V/V)
10
10
Please check each datasheet for complete details.
Z
IN
(DIFFERENTIAL)
(Ω)
200
200
I
S
(mA)
90
50
In addition to the LTC6400 family of amplifiers, a lower power LTC6401 family is available. The LTC6401 is pin compatible to the LTC6400, and has the
same low noise performance. The lower power consumption of the LTC6401 comes at the expense of slightly higher non-linearity, especially at input
frequencies above 140MHz. Please refer to the separate LTC6401 data sheets for complete details. Other gain versions from 8dB to 26dB will follow.
–OUTF
640020f
2
LTC6400-20
DC ELECTRICAL CHARACTERISTICS
+
The
●
–
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,
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No R
L
unless
otherwise noted.
PARAMETER
Gain
Gain Temperature Drift
Output Swing Low
Output Swing High
Maximum Differential Output Swing
Output Current Drive
Input Differential Offset Voltage
Input Differential Offset Voltage Drift
Input Common Mode Voltage Range, MIN
Input Common Mode Voltage Range, MAX
Input Resistance (+IN, –IN)
Input Capacitance (+IN, –IN)
Output Resistance (+OUT, –OUT)
Filtered Output Resistance (+OUTF, –OUTF)
Filtered Output Capacitance (+OUTF, –OUTF)
Common Mode Rejection Ratio
Common Mode Gain
Output Common Mode Range, MIN
●
SYMBOL
G
DIFF
TC
GAIN
V
SWINGMIN
V
SWINGMAX
V
OUTDIFFMAX
I
OUT
V
OSDIFF
TCV
OSDIFF
I
VRMIN
I
VRMAX
R
INDIFF
C
INDIFF
R
OUTDIFF
R
OUTFDIFF
C
OUTFDIFF
CMRR
G
CM
V
OCMMIN
V
OCMMAX
V
OSCM
TCV
OSCM
IV
OCM
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Pin
V
IL
V
IH
I
IL
I
IH
Power Supply
V
S
I
S
I
SHDN
PSRR
CONDITIONS
V
IN
= ±100mV Differential
V
IN
= ±100mV Differential
Each Output, V
IN
= ±600mV Differential
Each Output, V
IN
= ±600mV Differential
1dB Compressed
Each Output
T
MIN
to T
MAX
●
●
●
●
●
●
●
●
MIN
19.4
TYP
20
–1.5
80
MAX
20.6
150
UNITS
dB
mdB/°C
mV
V
V
P-P
mA
Input/Output Characteristic
2.35
20
–2
2.46
4.4
2
1.2
1
mV
μV/°C
V
V
Ω
pF
Ω
Ω
pF
dB
V/V
1.6
Differential
Differential, Includes Parasitic
Differential
Differential
Differential, Includes Parasitic
Input Common Mode Voltage 1.1V~1.4V
V
OCM
= 1V to 1.6V
●
●
●
●
170
18
85
45
200
1
25
100
2.7
65
1
230
32
115
Output Common Mode Voltage Control
1
1.1
1.6
1.5
–15
16
5
15
0.8
2.4
0.5
1.2
2.85
75
55
3
90
1
86
3
3.5
105
3
15
V
V
V
V
mV
μV/°C
μA
V
V
μA
μA
V
mA
mA
dB
Output Common Mode Range, MAX
●
Common Mode Offset Voltage
Common Mode Offset Voltage Drift
V
OCM
Input Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input Low Voltage
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input High Voltage
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input Low Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input High Current
Operating Supply Range
Supply Current
Shutdown Supply Current
Power Supply Rejection Ratio (Differential
Outputs)
V
OCM
= 1.1V to 1.5V
T
MIN
to T
MAX
●
●
●
●
●
⎯
EN
⎯
A
⎯
B
⎯
L
⎯
E = 0.8V
⎯
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 2.4V
●
●
●
⎯
EN
⎯
A
⎯
B
⎯
L
⎯
E = 0.8V
⎯
⎯
EN
⎯
A
⎯
B
⎯
L
⎯
E = 2.4V
⎯
V
+
= 2.85V to 3.5V
●
●
●
640020f
3
LTC6400-20
AC ELECTRICAL CHARACTERISTICS
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No R
L
unless otherwise noted.
SYMBOL
–3dBBW
0.1dBBW
0.5dBBW
1/f
SR
t
S1%
t
OVDR
t
ON
t
OFF
–3dBBW
VOCM
10MHz Input Signal
HD
2,10M
/HD
3,10M
Second/Third Order Harmonic
Distortion
2V
P-P,OUT
, R
L
= 400Ω
2V
P-P,OUT
, No R
L
2V
P-P,OUTFILT
, No R
L
IMD
3,10M
Third-Order Intermodulation
(f1 = 9.5MHz f2 = 10.5MHz)
2V
P-P,OUT
Composite, R
L
= 400Ω
2V
P-P,OUT
Composite, No R
L
2V
P-P,OUTFILT
Composite, No R
L
OIP
3,10M
P
1dB,10M
NF
10M
e
IN,10M
e
ON,10M
70MHz Input Signal
HD
2,70M
/HD
3,70M
Second/Third Order Harmonic
Distortion
2V
P-P,OUT
, R
L
= 400Ω
2V
P-P,OUT
, No R
L
2V
P-P,OUTFILT
, No R
L
IMD
3,70M
Third-Order Intermodulation
(f1 = 69.5MHz f2 = 70.5MHz)
2V
P-P,OUT
Composite, R
L
= 400Ω
2V
P-P,OUT
Composite, No R
L
2V
P-P,OUTFILT
Composite, No R
L
OIP
3,70M
P
1dB,70M
NF
70M
e
IN,70M
e
ON,70M
Third-Order Output Intercept Point
(f1 = 69.5MHz f2 = 70.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
2V
P-P,OUT
Composite, No R
L
(Note 7)
R
L
= 375Ω (Notes 5, 7)
R
L
= 375Ω (Note 5)
Includes Resistors (Short Inputs)
–86/–85
–88/–87
–86/–88
–93
–94
–93
51
18
6.2
2.1
21
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dB
nV/√Hz
nV/√Hz
Third-Order Output Intercept Point
(f1 = 9.5MHz f2 = 10.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
2V
P-P,OUT
Composite, No R
L
(Note 7)
R
L
= 375Ω (Notes 5, 7)
R
L
= 375Ω (Note 5)
Includes Resistors (Short Inputs)
–97/–93
–98/–97
–100/–98
–95
–99
–100
53.8
18
6.2
2.2
21.7
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dB
nV/√Hz
nV/√Hz
PARAMETER
–3dB Bandwidth
Bandwidth for 0.1dB Flatness
Bandwidth for 0.5dB Flatness
1/f Noise Corner
Slew Rate
1% Settling Time
Overdrive Recovery Time
Turn-On Time
Turn-Off Time
V
OCM
Pin Small Signal –3dB BW
Differential (Note 6)
2V
P-P,OUT
(Note 6)
1.9V
P-P,OUT
(Note 6)
+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)
CONDITIONS
200mV
P-P,OUT
(Note 6)
200mV
P-P,OUT
(Note 6)
200mV
P-P,OUT
(Note 6)
Specifications are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, V
OCM
= 1.25V,
MIN
TYP
1.84
0.3
0.7
10.5
4.5
0.8
4
82
190
15
MAX
UNITS
GHz
GHz
GHz
kHz
V/ns
ns
ns
ns
ns
MHz
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
640020f
4
LTC6400-20
AC ELECTRICAL CHARACTERISTICS
⎯
EN
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No R
L
unless otherwise noted.
⎯
SYMBOL
140MHz Input Signal
HD
2,140M
/HD
3,140M
Second/Third Order Harmonic
Distortion
2V
P-P,OUT
, R
L
= 400Ω
2V
P-P,OUT
, No R
L
2V
P-P,OUTFILT
, No R
L
IMD
3,140M
Third-Order Intermodulation
(f1 = 139.5MHz f2 = 140.5MHz)
2V
P-P,OUT
Composite, R
L
= 400Ω
2V
P-P,OUT
Composite, No R
L
2V
P-P,OUTFILT
Composite, No R
L
OIP
3,140M
P
1dB,140M
NF
140M
e
IN,140M
e
ON,140M
240MHz Input Signal
HD
2,240M
/HD
3,240M
Second-Order Harmonic Distortion
2V
P-P,OUT
, R
L
= 400Ω
2V
P-P,OUT
, No R
L
2V
P-P,OUTFILT
, No R
L
IMD
3,240M
Third-Order Intermodulation
(f1 = 239.5MHz f2 = 240.5MHz)
2V
P-P,OUT
Composite, R
L
= 400Ω
2V
P-P,OUT
Composite, No R
L
2V
P-P,OUTFILT
Composite, No R
L
OIP
3,240M
P
1dB,240M
NF
240M
e
N, 240M
e
ON,240M
Third-Order Output Intercept Point
(f1 = 239.5MHz f2 = 240.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
2V
P-P,OUT
Composite, No R
L
(Note 7)
R
L
= 375Ω (Notes 5, 7)
R
L
= 375Ω (Note 5)
Includes Resistors (Short Inputs)
–66/–58
–65/–63
–65/–58
–71
–74
–67
41
17.9
7.1
1.9
21.7
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dB
nV/√Hz
nV/√Hz
Third-Order Output Intercept Point
(f1 = 139.5MHz f2 = 140.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
2V
P-P,OUT
Composite, No R
L
(Notes 7)
R
L
= 375Ω (Notes 5, 7)
R
L
= 375Ω (Note 5)
Includes Resistors (Short Inputs)
–74/–74
–73/–83
–77/–76
–93
–87
–89
47.7
18.4
6.5
2.1
21.5
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dB
nV/√Hz
nV/√Hz
PARAMETER
CONDITIONS
Specifications are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, V
OCM
= 1.25V,
MIN
TYP
MAX
UNITS
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
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