LTC6400CUD-14 [Linear]
2.4GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF; 2.4GHz的低噪声，低失真差分ADC驱动器为300MHz的IF
| 型号： | LTC6400CUD-14 |
| 厂家： | 
Linear |
| 描述： | 2.4GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF |
| 文件： | 总16页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC6400-14
2.4GHz Low Noise, Low
Distortion Differential ADC
Driver for 300MHz IF
FEATURES
DESCRIPTION
The LTC®6400-14 is a high-speed differential amplifier
targeted at processing signals from DC to 300MHz. The
part has been specifically designed to drive 12-, 14- and
16-bitADCswithlownoiseandlowdistortion,butcanalso
be used as a general-purpose broadband gain block.
n
2.4GHz –3dB Bandwidth
n
Fixed Gain of 5V/V (14dB)
n
–97dBc IMD3 at 70MHz (Equivalent OIP3 = 52.4dBm)
n
–66dBc IMD3 at 300MHz (Equivalent OIP3 = 36.9dBm)
n
1.1nV/√Hz Internal Op Amp Noise
n
2.5nV/√Hz Total Input Noise
The LTC6400-14 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 14dB (5V/V).
n
7.5dB Noise Figure
n
Differential Inputs and Outputs
n
200Ω Input Impedance
n
2.85V to 3.5V Supply Voltage
n
85mA Supply Current (255mW)
n
1V to 1.6V Output Common Mode Voltage,
The LTC6400-14 saves space and power compared to
alternativesolutionsusingIFgainblocksandtransformers.
The LTC6400-14 is packaged in a compact 16-lead 3mm ×
3mm QFN package and operates over the –40°C to 85°C
temperature range.
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.8V
n
n
P-P
n
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS
n
Differential ADC Driver
n
Differential Driver/Receiver
n
Single Ended to Differential Conversion
IF Sampling Receivers
n
n
SAW Filter Interfacing
TYPICAL APPLICATION
Equivalent Output IP3 vs
Single-Ended to Differential ADC Driver
Frequency
70
(NOTE 7)
3.3V
3.3V
60
50
40
30
20
10
0
C2
C1
C
F2
0.1μF
1000pF
33pF
+
V
C3
R
R
S3
S1
0.1μF
15Ω
10Ω
V
+
–
DD
+OUT
AIN
V
+IN
IN
R1
68.5Ω
L1
24nH
C
C4
0.1μF
F1
LTC6400-14
–OUT
LTC2208
R
15Ω
R
S4
33pF
S2
10Ω
–IN
AIN
V
V
CM
OCM
R2
29Ω
C
F3
33pF
–
COILCRAFT
0603CS
LTC2208
130Msps
V
0
50
100
150
200
250
300
1.25V
16-Bit ADC
FREQUENCY (MHz)
64014 TA01a
640020 TA01b
C5
0.1μF
R3
100Ω
640014fb
1
LTC6400-14
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
TOP VIEW
+
–
Supply Voltage (V – V ) .........................................3.6V
Input Current (Note 2).......................................... 10mA
Operating Temperature Range
16 15 14 13
+
–
V
1
2
3
4
12 V
(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
11 ENABLE
OCM
+
17
+
V
V
V
10
9
–
–
V
5
6
7
8
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
= 150°C, θ = 68°C/W, θ = 4.2°C/W
T
JMAX
JA
JC
–
EXPOSED PAD (PIN 17) IS V , MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC6400CUD-14#PBF
LTC6400IUD-14#PBF
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LTC6400CUD-14#TRPBF LCCR
0°C to 70°C
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
LTC6400IUD-14#TRPBF
LCCR
–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/
Please check each datasheet for complete details.
LTC6400 AND LTC6401 SELECTOR GUIDE
PART NUMBER
GAIN
(dB)
GAIN
(V/V)
Z
(DIFFERENTIAL)
(Ω)
I
CC
(mA)
IN
LTC6400-8
LTC6400-14
LTC6400-20
LTC6400-26
LTC6401-8
LTC6401-14
LTC6401-20
LTC6401-26
8
2.5
5
400
200
200
50
85
14
20
26
8
85
10
20
2.5
5
90
85
400
200
200
50
45
14
20
26
45
10
20
50
45
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.
640014fb
2
LTC6400-14
DC ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V– = 0V, +IN = –IN = VOCM = 1.25V, ENABLE = 0V, No RL unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
14.5
160
UNITS
Input/Output Characteristic
l
l
l
l
l
l
l
l
G
DIFF
Gain
V
V
=
=
200mV Differential
200mV Differential
13.5
14
–0.9
77
dB
mdB/°C
mV
IN
TC
GAIN
Gain Temperature Drift
IN
V
V
V
Output Swing Low
Each Output, V
Each Output, V
=
=
800mV Differential
800mV Differential
SWINGMIN
SWINGMAX
OUTDIFFMAX
OUT
IN
IN
Output Swing High
2.35
2.48
4.8
V
Maximum Differential Output Swing
Output Current Drive
1dB Compressed
Each Output
V
P-P
I
20
–3
mA
mV
μV/°C
V
V
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)
3
1
OSDIFF
TCV
T
MIN
to T
MAX
0.7
OSDIFF
VRMIN
VRMAX
I
I
1.8
V
l
R
Differential
170
200
1
230
Ω
INDIFF
INDIFF
C
Differential, Includes Parasitic
Differential
pF
l
l
R
R
18
85
25
32
Ω
OUTDIFF
OUTFDIFF
OUTFDIFF
Differential
100
2.7
62
115
Ω
C
Filtered Output Capacitance (+OUTF, –OUTF) Differential, Includes Parasitic
Common Mode Rejection Ratio Input Common Mode Voltage 1.1V~1.7V
Output Common Mode Voltage Control
pF
l
CMRR
40
dB
G
Common Mode Gain
V
= 1V to 1.6V
1
V/V
CM
OCM
V
V
V
Output Common Mode Range, MIN
1
V
V
OCMMIN
l
1.1
Output Common Mode Range, MAX
1.6
1.5
V
V
OCMMAX
l
l
l
l
Common Mode Offset Voltage
V
= 1.1V to 1.5V
–15
15
15
mV
μV/°C
μA
OSCM
OCM
MIN
TCV
Common Mode Offset Voltage Drift
T
to T
9
4
OSCM
MAX
IV
V
Input Current
OCM
OCM
ENABLE Pin
l
l
l
l
V
V
ENABLE Input Low Voltage
ENABLE Input High Voltage
ENABLE Input Low Current
ENABLE Input High Current
0.8
V
V
IL
2.4
IH
I
IL
I
IH
ENABLE = 0.8V
ENABLE = 2.4V
0.5
3
μA
μA
1.3
Power Supply
l
l
l
l
V
Operating Supply Range
Supply Current
2.85
70
3
3.5
96
3
V
mA
mA
dB
S
I
I
ENABLE = 0.8V
85
0.9
76
S
Shutdown Supply Current
ENABLE = 2.4V, Input and Output Floating
SHDN
+
PSRR
Power Supply Rejection Ratio (Differential
Outputs)
V = 2.85V to 3.5V
55
640014fb
3
LTC6400-14
AC ELECTRICAL CHARACTERISTICS Specifications are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V,
ENABLE = 0V, No RL unless otherwise noted.
SYMBOL
–3dBBW
0.1dBBW
0.5dBBW
1/f
PARAMETER
CONDITIONS
MIN
TYP
2.37
200
377
15
MAX
UNITS
GHz
MHz
MHz
kHz
V/μs
ns
–3dB Bandwidth
200mV
200mV
200mV
(Note 6)
(Note 6)
(Note 6)
1.2
P-P, OUT
P-P, OUT
P-P, OUT
Bandwidth for 0.1dB Flatness
Bandwidth for 0.5dB Flatness
1/f Noise Corner
SR
Slew Rate
Differential (Note 6)
2V (Note 6)
6000
1.7
t
t
t
1% Settling Time
S1%
OVDR
ON
P-P, OUT
Overdrive Recovery Time
Turn-On Time
1.9V
(Note 6)
17
ns
P-P, OUT
Differential Output Reaches 90% of Steady
State Value
10
ns
t
Turn-Off Time
Differential Output Drops to 10% of
Original Value
12
16
ns
OFF
–3dBBW
V
Pin Small Signal –3dB BW
0.1V at V , Measured Single-Ended
OCM
MHz
VOCM
OCM
P-P
at Output (Note 6)
10MHz Input Signal
HD2,10M/HD3,10M
Second/Third Order Harmonic
Distortion
–107/–96
–110/–108
–99
dBc
dBc
dBc
dBc
dBm
2V
2V
2V
2V
2V
, R = 200Ω
L
P-P, OUT
, No R
P-P, OUT
L
IMD3,10M
OIP3,10M
Third-Order Intermodulation
(f1 = 9.5MHz f2 = 10.5MHz)
Composite, R = 200Ω
P-P, OUT
P-P, OUT
P-P, OUT
L
Composite, No R
–110
L
Third-Order Output Intercept Point
(f1 = 9.5MHz f2 = 10.5MHz)
Composite, No R (Note 7)
59.1
L
P1dB,10M
NF10M
1dB Compression Point
Noise Figure
17.8
7.5
2.5
13
dBm
dB
R = 375Ω (Notes 5, 7)
L
R = 375Ω (Note 5)
L
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
nV/√Hz
nV/√Hz
IN,10M
ON,10M
70MHz Input Signal
HD2,70M/HD3,70M
Second/Third Order Harmonic
Distortion
–86/–85
–89/–94
–91
dBc
dBc
dBc
dBc
dBm
2V
2V
2V
2V
2V
, R = 200Ω
L
P-P, OUT
, No R
P-P, OUT
L
IMD3,70M
OIP3,70M
Third-Order Intermodulation
(f1 = 69.5MHz f2 = 70.5MHz)
Composite, R = 200Ω
P-P, OUT
P-P, OUT
P-P, OUT
L
Composite, No R
–97
L
Third-Order Output Intercept Point
(f1 = 69.5MHz f2 = 70.5MHz)
Composite, No R (Note 7)
52.4
L
P1dB,70M
NF70M
1dB Compression Point
Noise Figure
18.5
7.5
dBm
dB
R = 375Ω (Notes 5, 7)
L
R = 375Ω (Note 5)
L
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.5
nV/√Hz
nV/√Hz
IN,70M
12.5
ON,70M
640014fb
4
LTC6400-14
AC ELECTRICAL CHARACTERISTICS Specifications are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V,
ENABLE = 0V, No RL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
140MHz Input Signal
HD2,140M/HD3,140M Second/Third Order Harmonic
Distortion
–78/–74
–81/–79
–80
dBc
dBc
dBc
dBc
dBm
2V
2V
2V
2V
2V
, R = 200Ω
L
P-P, OUT
, No R
P-P, OUT
L
IMD3,140M
Third-Order Intermodulation
(f1 = 139.5MHz f2 = 140.5MHz)
Composite, R = 200Ω
P-P, OUT
P-P, OUT
P-P, OUT
L
Composite, No R
–85
L
OIP3,140M
Third-Order Output Intercept Point
(f1 = 139.5MHz f2 = 140.5MHz)
Composite, No R (Notes 7)
46.5
L
P1dB,140M
NF140M
1dB Compression Point
Noise Figure
18.8
7.7
dBm
dB
R = 375Ω (Notes 5, 7)
L
R = 375Ω (Note 5)
L
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.5
nV/√Hz
nV/√Hz
IN,140M
ON,140M
12.6
240MHz Input Signal
HD2,240M/HD3,240M Second/Third-Order Harmonic
Distortion
–63/–57
–67/–63
–68
dBc
dBc
dBc
dBc
dBm
2V
2V
2V
2V
2V
, R = 200Ω
L
P-P, OUT
, No R
P-P, OUT
L
IMD3, 240M
Third-Order Intermodulation
(f1 = 239.5MHz f2 = 240.5MHz)
Composite, R = 200Ω
P-P, OUT
P-P, OUT
P-P, OUT
L
Composite, No R
–71
L
OIP3, 240M
Third-Order Output Intercept Point
(f1 = 239.5MHz f2 = 240.5MHz)
Composite, No R (Note 7)
39.6
L
P1dB, 240M
NF240M
1dB Compression Point
Noise Figure
17.9
8
dBm
dB
R = 375Ω (Notes 5, 7)
L
R = 375Ω (Note 5)
L
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.5
12.9
nV/√Hz
nV/√Hz
N, 240M
ON, 240M
640014fb
5
LTC6400-14
AC ELECTRICAL CHARACTERISTICS Specifications are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V,
ENABLE = 0V, No RL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
300MHz Input Signal
HD2,300M/HD3,300M Second/Third-Order Harmonic
Distortion
–61/–51
–61/–55
–62
dBc
dBc
dBc
dBc
dBm
2V
2V
2V
2V
2V
, R = 200Ω
L
P-P, OUT
, No R
P-P, OUT
L
IMD3,300M
Third-Order Intermodulation
(f1 = 299.5MHz f2 = 300.5MHz)
Composite, R = 200Ω
P-P, OUT
P-P, OUT
P-P, OUT
L
Composite, No R
–66
L
OIP3,300M
Third-Order Output Intercept Point
(f1 = 299.5MHz f2 = 300.5MHz)
Composite, No R (Note 7)
36.9
L
P1dB,300M
NF300M
1dB Compression Point
Noise Figure
17.4
8.2
dBm
dB
R = 375Ω (Notes 5, 7)
L
R = 375Ω (Note 5)
L
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.5
nV/√Hz
nV/√Hz
dBc
N, 300M
13.9
–63
ON, 300M
IMD3,280M/320M
Third-Order Intermodulation
(f1 = 280MHz f2 = 320MHz)
Measured at 360MHz
–55
2V
Composite, R = 375Ω
L
P-P, OUT
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 5: Input and output baluns used. See Test Circuit A.
Note 6: Measured using Test Circuit B.
Note 7: Since the LTC6400-14 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
LTC6400-14 with amplifiers that require 50Ω output load, the LTC6400-14
output voltage swing driving a given R is converted to OIP3 and P as
L
1dB
Note 3: The LTC6400C and LTC6400I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
if it were driving a 50Ω load. Using this modified convention, 2V is by
P-P
definition equal to 10dBm, regardless of actual R .
L
Note 4: The LTC6400C is guaranteed to meet specified performance from
0°C to 70°C. It is designed, characterized and expected to meet specified
performance from –40 to 85°C but is not tested or QA sampled at these
temperatures. The LTC6400I is guaranteed to meet specified performance
from –40°C to 85°C.
640014fb
6
LTC6400-14
TYPICAL PERFORMANCE CHARACTERISTICS
S21 Phase and Group Delay vs
Frequency
Frequency Response
Gain 0.1dB Flatness
0
–50
0.4
0.2
0.0
20
18
16
14
12
10
8
1
0.9
TEST CIRCUIT B
TEST CIRCUIT B
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
–100
–150
–200
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1
6
4
PHASE
GROUP DELAY
2
TEST CIRCUIT B
0
0
200
400
600
800
1000
10
100
1000 3000
10
100
1000 3000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
640014 G03
640014 G01
640014 G02
Input and Output Reflection and
Reverse Isolation vs Frequency
Input and Output Impedance vs
Frequency
PSRR and CMRR vs Frequency
250
225
200
175
150
125
100
75
100
80
80
70
60
50
40
30
20
10
0
0
–10
–20
–30
–40
–50
–60
–70
–80
Z
IN
60
PSRR
CMRR
40
Z
20
OUT
0
–20
–40
–60
–80
–100
Z
IN
PHASE
IMPEDANCE MAGNITUDE
50
S11
S22
S11
25
Z
OUT
0
10
100
1000
1
10
100
1000
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
640014 G05
640014 G06
640014 G04
Noise Figure and Input Referred
Noise Voltage vs Frequency
Small Signal Transient Response
Large Signal Transient Response
15
14
13
12
11
10
9
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1.35
2.50
–OUT
+OUT
–OUT
+OUT
2.00
1.50
1.00
0.50
0.00
1.30
1.25
1.20
1.15
EN
NOISE FIGURE
8
7
6
R
= 87.5Ω PER OUTPUT
L
R
= 87.5Ω PER OUTPUT
L
TEST CIRCUIT B
TEST CIRCUIT B
5
10
100
1000
0
2
4
6
8
10
0
2
4
6
8
10
TIME (ns)
TIME (ns)
FREQUENCY (MHz)
640014 G07
640014 G08
640014 G09
640014fb
7
LTC6400-14
TYPICAL PERFORMANCE CHARACTERISTICS
1% Settling Time for 2V
Output Step
Overdrive Recovery Response
Harmonic Distortion vs Frequency
5
4
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5
4
–40
–50
R
= 87.5Ω PER OUTPUT
R
= 87.5Ω PER OUTPUT
DIFFERENTIAL INPUT
OUT P-P
L
L
TEST CIRCUIT B
TEST CIRCUIT B
V
= 2V
3
3
+IN
–IN
–60
2
2
1
1
–70
0
0
–80
–1
–2
–3
–4
–5
–1
–2
–3
–4
–5
+OUT
–90
HD2 NO R
L
HD2 200Ω R
L
–100
–110
–OUT
40
HD3 NO R
L
HD3 200Ω R
L
0
20
60
80
100
0
1
2
3
4
5
0
50
100
150
200
250
300
TIME (ns)
TIME (ns)
FREQUENCY (MHz)
640014 G10
640014 G11
640014 G12
Third Order Intermodulation
Distortion vs Frequency
Third Order Intermodulation
Distortion vs Frequency
Harmonic Distortion vs Frequency
–40
–50
–40
–50
–40
–50
NO R
L
200Ω R
L
NO R
L
200Ω R
L
SINGLE-ENDED INPUT
V
= 2V
OUT
P-P
–60
–60
–60
–70
–70
–70
–80
–80
–80
–90
–90
–90
HD2 NO R
L
HD2 200Ω R
L
–100
–110
–100
–110
–100
–110
DIFFERENTIAL INPUT
SINGLE-ENDED INPUT
HD3 NO R
L
V
= 2V COMPOSITE
V
= 2V COMPOSITE
HD3 200Ω R
OUT
P-P
OUT
P-P
L
0
50
100
150
200
250
300
0
50
100
150
200
250
300
0
50
100
150
200
250
300
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
640014 G13
640014 G15
640014 G14
640014fb
8
LTC6400-14
TYPICAL PERFORMANCE CHARACTERISTICS
Equivalent Output 1dB
Compression Point vs Frequency
Equivalent Output Third Order
Intercept vs Frequency
IMD3 vs VICM and VOCM
20
19
18
17
16
15
–85
–88
70
60
50
40
30
20
10
0
NO R
L
200Ω R
L
SWEEP V
OCM
INPUT AC-COUPLED
–91
SWEEP V
ICM
= 1.25V
V
–94
OCM
DIFFERENTIAL INPUT
–97
R
= 375Ω
L
TEST CIRCUIT A
(NOTE 7)
V
= 2V COMPOSITE at 100MHz
OUT P-P
DIFFERENTIAL INPUT
(NOTE 7)
DIFFERENTIAL INPUT NO R
L
–100
0
50
100
150
200
250
300
1.0
1.2
1.4
1.6
1.8
0
50
100
150
200
250
300
FREQUENCY (MHz)
COMMON MODE VOLTAGE (V)
FREQUENCY (MHz)
640014 G16
640014 G17
640014 G18
Turn-On Time
Turn-Off Time
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
R
= 87.5Ω PER OUTPUT
L
ENABLE
+OUT
–OUT
+OUT
–OUT
ENABLE
R
= 87.5Ω PER OUTPUT
L
–0.5
–0.5
–20
0
20
40
60
80
–20
0
20
40
60
80
TIME (ns)
TIME (ns)
640014 G19
640014 G20
640014fb
9
LTC6400-14
PIN FUNCTIONS
V (Pins 1, 3, 10): Positive Power Supply (Normally tied
to 3V or 3.3V). All three pins must be tied to the same
voltage.Bypasseachpinwith1000pFand0.1μFcapacitors
as close to the pins as possible.
+
–OUTF, +OUTF (Pins 6, 7): Filtered Outputs. These pins
have 50Ω series resistors and a 2.7pF shunt capacitor.
ENABLE (Pin 11): This pin is a logic input referenced to
V . If low, the part is enabled. If high, the part is disabled
EE
V
(Pin 2): This pin sets the output common mode
and draws approximately 1mA supply current.
OCM
voltage. A 0.1μF external bypass capacitor is recom-
+IN (Pins 13, 14): Positive Input. Pins 13 and 14 are
internally shorted together.
mended.
–
V (Pins 4, 9, 12, 17): Negative Power Supply (GND). All
–IN (Pins 15, 16): Negative Input. Pins 15 and 16 are
internally shorted together.
four pins must be connected to same voltage/ground.
–OUT, +OUT (Pins 5, 8): Unfiltered Outputs. These pins
–
Exposed Pad (Pin 17): V . The Exposed Pad must be
have series resistors, R
12.5Ω.
OUT
connected to same voltage/ground as pins 4, 9, 12.
BLOCK DIAGRAM
–
+
–
V
ENABLE
V
V
12
11
10
9
BIAS CONTROL
R
F
R
R
OUT
G
+IN
13
+OUT
500Ω
100Ω
12.5Ω
8
7
R
FILT
+OUTF
50Ω
+IN
–IN
IN+
IN–
OUT–
14
15
C
FILT
R
FILT
2.7pF
–OUTF
–OUT
50Ω
6
5
OUT+
R
R
G
100Ω
R
OUT
12.5Ω
F
–IN
16
500Ω
2k
COMMON
MODE CONTROL
5.3pF
640014 BD
1
2
V
3
4
+
+
–
V
V
V
OCM
640014fb
10
LTC6400-14
APPLICATIONS INFORMATION
Circuit Operation
value impedance, e.g. 50Ω, in order to provide an imped-
ance match for the source. Several choices are available.
One approach is to use a differential shunt resistor (Figure
1).Anotherapproachistoemployawidebandtransformer
(Figure 2). Both methods provide a wide band impedance
match. The termination resistor or the transformer must
be placed close to the input pins in order to minimize
the reflection due to input mismatch. Alternatively, one
could apply a narrowband impedance match at the inputs
of the LTC6400-14 for frequency selection and/or noise
reduction.
The LTC6400-14 is a low noise and low distortion fully
differential op amp/ADC driver with:
• Operation from DC to 2.4GHz (–3dB bandwidth)
• Fixed gain of 5V/V (14dB)
• Differential input impedance 200Ω
• Differential output impedance 25Ω
• On-Chip 590MHz output filter
The LTC6400 is composed of a fully differential amplifier
with on chip feedback and output common mode voltage
controlcircuitry. Differentialgainandinputimpedanceare
set by 100Ω/1000Ω resistors in the feedback network.
Smalloutputresistorsof12.5Ωimprovethecircuitstability
over various load conditions. They also provide a possible
external filtering option, which is often desirable when the
load is an ADC.
ReferringtoFigure3,LTC6400-14canbeeasilyconfigured
for single-ended input and differential output without a
balun. The signal is fed to one of the inputs through a
matchingnetworkwhiletheotherinputisconnectedtothe
samematchingnetworkandasourceresistor.Becausethe
return ratios of the two feedback paths are equal, the two
outputs have the same gain and thus symmetrical swing.
Filter resistors of 50Ω are available for additional filtering.
Lowpass/bandpass filters are easily implemented with
just a couple of external components. Moreover, they of-
fer single-ended 50Ω matching in wideband applications
and no external resistor is needed.
LTC6400-14
500Ω
25Ω
100Ω
12.5Ω
50Ω
13 +IN
14 +IN
+OUT
8
7
IN+
IN–
OUT–
+OUTF
V
IN
+
66.5Ω
–
50Ω
2.7pF
The LTC6400-14 is very flexible in terms of I/O coupling.
It can be AC- or DC-coupled at the inputs, the outputs or
both. Due to the internal connection between input and
output, users are advised to keep input common mode
voltage between 1V and 1.8V for proper operation. If the
inputs are AC-coupled, the input common mode voltage
15 –IN
16 –IN
–OUTF
6
5
OUT+
500Ω
25Ω
100Ω
12.5Ω
–OUT
640014 F01
Figure 1. Input Termination for Differential 50Ω Input Impedance
Using Shunt Resistor
isautomaticallybiasedapproximately450mVaboveV
OCM
and thus no external circuitry is needed for bias. The
LTC6400-14
500Ω
25Ω
100Ω
12.5Ω
50Ω
LTC6400-14 provides an output common mode voltage
13 +IN
+OUT
8
7
set by V
, which allows driving an ADC directly without
OCM
1:4
• •
externalcomponentssuchasatransformerorACcoupling
capacitors. The input signal can be either single-ended
or differential with only minor differences in distortion
performance.
IN+
IN–
OUT–
+OUTF
V
IN
14 +IN
15 –IN
+
–
50Ω
2.7pF
–OUTF
6
5
OUT+
500Ω
25Ω
100Ω
12.5Ω
Input Impedance and Matching
16 –IN
–OUT
640014 F02
MINI-CIRCUITS
TCM4-19
The differential input impedance of the LTC6400-14 is
200Ω. If a 200Ω source impedance is unavailable, then
thedifferentialinputsmayneedtobeterminatedtoalower
Figure 2. Input Termination for Differential 50Ω Input Impedance
Using a 1:4 Balun
640014fb
11
LTC6400-14
APPLICATIONS INFORMATION
R
S
LTC6400-14
Output Match and Filter
0.1μF
1000Ω
50Ω
100Ω
12.5Ω
13 +IN
+OUT
8
7
V
The LTC6400-14 can drive an ADC directly without
external output impedance matching. Alternatively, the
differential output impedance of 25Ω can be matched to
higher value impedance, e.g. 50Ω, by series resistors or
an LC network.
IN
+
50Ω
–
R
T
IN+
IN–
OUT–
68.5Ω
+OUTF
14 +IN
15 –IN
0.1μF
50Ω
2.7pF
–OUTF
6
5
OUT+
1000Ω
0.1μF
100Ω
12.5Ω
16 –IN
–OUT
640014 F03
R
T
The internal low pass filter outputs at +OUTF/–OUTF have
a –3dB bandwidth of 590MHz. External capacitors can
reduce the low pass filter bandwidth as shown in Figure 5.
A bandpass filter is easily implemented with only a few
componentsasshowninFigure6.Three39pFcapacitorsand
a16nHinductorcreateabandpassfilterwith165MHzcenter
frequency, –3dB frequencies at 138MHz and 200MHz.
29Ω
Figure 3. Input Termination for Single-Ended 50Ω Input
Impedance
In general, the single-ended input impedance and
terminationresistorR aredeterminedbythecombination
T
of R , R and R . For example, when R is 50Ω, it is found
S
G
F
S
Output Common Mode Adjustment
that the single-ended input impedance is 202Ω and R is
T
68.5Ω in order to match to a 50Ω source impedance.
The output common mode voltage is set by the V
pin,
OCM
whichisahighimpedanceinput.Theoutputcommonmode
The LTC6400-14 is unconditionally stable under normal
bias conditions. However, the overall differential gain is
affected by both source impedance and load impedance
as shown in Figure 4:
voltage is capable of tracking V
in a range from 1V to
OCM
1.6V. The bandwidth of V
control is typically 16MHz,
OCM
LTC6400-14
500Ω
100Ω
12.5Ω
50Ω
VOUT
RL
RS +200 25+RL
1000
13 +IN
+OUT
8
7
AV =
=
•
8.2pF
FILTERED OUTPUT
V
IN
IN+
IN–
OUT–
+OUTF
14 +IN
15 –IN
12pF
(87.5MHz)
50Ω
The noise performance of the LTC6400-14 also depends
uponthesourceimpedanceandtermination. Forexample,
an input 1:4 balun transformer in Figure 2 improves SNR
by adding 6dB of voltage gain at the inputs. A trade-off
between gain and noise is obvious when constant noise
figure circle and constant gain circle are plotted within
the same input Smith Chart, based on which users can
choose the optimal source impedance for a given gain
and noise requirement.
2.7pF
–OUTF
6
5
OUT+
500Ω
8.2pF
100Ω
12.5Ω
16 –IN
–OUT
640014 F05
Figure 5. LTC6400-14 Internal Filter Topology Modified for Low
Filter Bandwidth (Three External Capacitors)
39pF
LTC6400-14
12.5Ω
500Ω
100Ω
10Ω
4.99Ω
13 +IN
+OUT
8
7
LTC6400-14
50Ω
500Ω
1/2 R
100Ω
12.5Ω
50Ω
1/2 R
L
S
IN+
IN–
OUT–
+OUTF
13 +IN
+OUT
8
7
14 +IN
15 –IN
16nH
LTC2208
2.7pF
39pF
50Ω
IN+
IN–
OUT–
OUT+
500Ω
+OUTF
–OUTF
6
5
V
IN
14 +IN
15 –IN
V
OUT
+
–
50Ω
100Ω
12.5Ω
10Ω
39pF
4.99Ω
2.7pF
–OUTF
6
5
OUT+
500Ω
16 –IN
–OUT
640014 F06
1/2 R
100Ω
12.5Ω
1/2 R
L
S
16 –IN
–OUT
Figure 6. LTC6400-14 Internal Filter Topology Modified
for Bandpass Filtering (Three External Capacitors, One
External Inductor)
640014 F04
Figure 4. Calculate Differential Gain
640014fb
12
LTC6400-14
APPLICATIONS INFORMATION
–40
–50
which is dominated by a low pass filter connected to the
SINGLE-ENDED INPUT
= 122.8Msps
f
S
V
pin and is aimed to reduce common mode noise
OCM
DRIVER V
= 2V COMPOSITE
OUT
P-P
generation at the outputs. The internal common mode
feedback loop has a –3dB bandwidth around 400MHz,
allowing fast common mode rejection at the outputs of
–60
–70
the LTC6400-14. The V
pin should be tied to a DC bias
OCM
–80
voltage with a 0.1μF bypass capacitor. When interfacing
–90
withA/DconverterssuchastheLTC22xxfamilies,theV
OCM
–100
–110
pin can be connected to the V pin of the ADC.
CM
0
50
100
150
200
250
300
Driving A/D Converters
FREQUENCY (MHz)
640014 F08
The LTC6400-14 has been specifically designed to inter-
face directly with high speed A/D converters. In Figure 7,
an example schematic shows the LTC6400-14 with a
single-ended input driving the LTC2208, which is a 16-bit,
130MspsADC.Twoexternal4.99Ωresistorshelpeliminate
potential resonance associated with stray capacitance of
PCB traces and bond wires of either the ADC input or the
Figure 8. IMD3 for the Combination of LTC6400-14 and LTC2208
specifications, two test circuits are used to generate the
information in this datasheet. Test Circuit A is DC987B,
a two-port demonstration circuit for the LTC6400 family.
The schematic and silkscreen are shown below. This
circuit includes input and output transformers (baluns)
forsingle-ended-to-differentialconversionandimpedance
transformation, allowing direct hook-up to a 2-port
driveroutput.V
oftheLTC6400-14isconnectedtoV
OCM
CM
of the LTC2208 V pin at 1.25V. Alternatively, a single-
CM
ended input signal can be converted to a differential signal
via a balun and fed to the input of the LTC6400-14.
Top Silkscreen
Figure 8 summarizes the IMD3 of the whole system in
Figure 7. Note that Figure 7 shows a direct connection
to the LTC2208, but in many applications an anti-alias
filter would be desirable to limit the wideband noise of
the amplifier. This is especially true in high performance
16-bit designs.
Test Circuits
Due to the fully-differential design of the LTC6400 and
its usefulness in applications with differing characteristic
1.25V
0.1μF
0.1μF
V
OCM
4.99Ω
4.99Ω
+IN
V
–
+
CM
IF IN
66.5Ω
+OUT
AIN
AIN
+OUTF
LTC6400-14
LTC2208
0.1μF
–OUTF
–IN
ENABLE
–OUT
29Ω
LTC2208 130Msps
16-Bit ADC
14dB GAIN
640014 F07
Figure 7. Single-Ended Input to LTC6400-14 and LTC2208
640014fb
13
LTC6400-14
APPLICATIONS INFORMATION
network analyzer. There are also series resistors at the
output to present the LTC6400 with a 375Ω differential
load, optimizing distortion performance. Due to the input
and output transformers, the –3dB bandwidth is reduced
from 2.4GHz to approximately 1.8GHz.
Test Circuit B uses a 4-port network analyzer to measure
S-parameters and gain/phase response. This removes the
effects of the wideband baluns and associated circuitry,
for a true picture of the >1GHz S-parameters and AC
characteristics.
TYPICAL APPLICATIONS
Demo Circuit 987B Schematic (Test Circuit A)
V
CC
ENABLE
DIS
1
3
V
CC
2
JP1
C17
1000pF
C18
0.1μF
R16
0Ω
12
11
10
9
–
+
–
V
ENABLE
V
V
R10
R2
(1)
R14
(1)
86.6Ω
13
14
15
16
8
7
6
5
+IN
+IN
–IN
+OUT
R6
0Ω
T2
TCM 4-19
R12
0Ω
R8
(1)
C2
0.1μF
C4
R4
(2)
T1
(2)
5
4
1
2
3
3
2
1
4
J1
+IN
J4
+OUT
0.1μF
C21
0.1μF
+OUTF
–OUTF
–OUT
R24
(1)
SL1
(2)
SL2
(2)
R7
(1)
LTC6400-14
R5
(1)
R11
(1)
SL3
(2)
J5
–OUT
0dB
5
J2
–IN
R3
(2)
C1
0.1μF
C3
0.1μF
R9
86.6Ω
–IN
V
R13
0Ω
C22
R1
0Ω
+
+
–
V
V
V
0.1μF
OCM
1
2
3
4
V
CC
V
CC
C10
0.1μF
C9
1000pF
C12
1000pF
C13
0.1μF
V
CC
R19
1.5k
TP5
V
OCM
R20
1k
C7
0.1μF
T3
TCM 4-19
1:4
T4
TCM 4-19
1:4
R17
R18
0Ω
0Ω
5
4
1
2
3
3
2
1
4
J6
TEST IN
J7
C23
C5
C19
0.1μF
C20
0.1μF
TEST OUT
0.1μF
0.1μF
R21
(1)
R22
(1)
R25
0Ω
R26
0Ω
C24
0.1μF
C6
0.1μF
5
V
CC
TP2
V
CC
NOTE: UNLESS OTHERWISE SPECIFIED.
(1) DO NOT STUFF.
C14
4.7μF
C15
1μF
2.85V TO 3.5V
(2) VERSION
IC
R3
R4
T1
SL1
SL2
SL3
8dB
TP3
GND
-B
LTC6400CUD-14 OPEN OPEN MINI-CIRCUITS TCM4-19 (1:4) 6dB
14dB
SL = SIGNAL LEVEL
SL LEVELS DO NOT INCLUDE TRANSFORMER LOSS IN T1 AND T2
640014 TA03
640014fb
14
LTC6400-14
TYPICAL APPLICATIONS
Test Circuit B, 4-Port Analysis
+
V
1000pF
0.1μF
–
+
–
V
V
ENABLE
V
12
G
11
10
9
LTC6400-14
BIAS CONTROL
R
F
500Ω
R
R
OUT
+IN
13
+OUT
37.4Ω
100Ω
12.5Ω
PORT 1
(50Ω)
PORT 3
(50Ω)
8
7
R
FILT
50Ω
0.1μF
0.1μF
+OUTF
+IN
–IN
IN+
IN–
OUT–
14
15
1/2
AGILENT
E5O71A
1/2
AGILENT
E5O71A
C
FILT
2.7pF
R
FILT
50Ω
200Ω
–OUTF
–OUT
6
5
OUT+
R
F
R
G
100Ω
R
OUT
12.5Ω
–IN
16
500Ω
37.4Ω
PORT 2
(50Ω)
PORT 4
(50Ω)
0.1μF
0.1μF
COMMON
MODE CONTROL
640014 TA02
1
2
3
4
+
+
–
V
V
V
V
OCM
1000pF
0.1μF
0.1μF
+
V
V
OCM
PACKAGE DESCRIPTION
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1691)
BOTTOM VIEW—EXPOSED PAD
PIN 1 NOTCH R = 0.20 TYP
OR 0.25 × 45° CHAMFER
R = 0.115
TYP
0.75 0.05
3.00 0.10
(4 SIDES)
15 16
0.70 0.05
PIN 1
TOP MARK
(NOTE 6)
0.40 0.10
1
2
1.45 0.10
(4-SIDES)
3.50 0.05
2.10 0.05
1.45 0.05
(4 SIDES)
PACKAGE
OUTLINE
(UD16) QFN 0904
0.200 REF
0.25 0.05
0.50 BSC
0.25 0.05
0.50 BSC
0.00 – 0.05
NOTE:
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
640014fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LTC6400-14
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
High-Speed Differential Amplifiers/Differential Op Amps
LT®1993-2
LT1993-4
LT1993-10
LT1994
800MHz Differential Amplifier/ADC Driver
900MHz Differential Amplifier/ADC Driver
700MHz Differential Amplifier/ADC Driver
Low Noise, Low Distortion Differential Op Amp
A = 2V/V, OIP3 = 38dBm at 70MHz
V
A = 4V/V, OIP3 = 40dBm at 70MHz
V
A = 10V/V, OIP3 = 40dBm at 70MHz
V
16-Bit SNR and SFDR at 1MHz, Rail-to-Rail Outputs
LT5514
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OIP3 = 47dBm at 100MHz, Gain Control Range 10.5dB to 33dB
LT5524
Low Distortion IF Amplifier/ADC Driver with Digitally
Controlled Gain
OIP3 = 40dBm at 100MHz, Gain Control Range 4.5dB to 37dB
LTC6400-8
LTC6400-20
LTC6400-26
LTC6401-8
LTC6401-14
LTC6401-20
LTC6401-26
LT6402-6
2.2GHz Low Noise, Low Distortion, Differential ADC Driver
1.8GHz Low Noise, Low Distortion, Differential ADC Driver
1.9GHz Low Noise, Low Distortion, Differential ADC Driver
2.2GHz Low Noise, Low Distortion, Differential ADC Driver
2GHz Low Noise, Low Distortion, Differential ADC Driver
1.3GHz Low Noise, Low Distortion, Differential ADC Driver
1.6GHz Low Noise, Low Distortion, Differential ADC Driver
300MHz Differential Amplifier/ADC Driver
A = 8dB, 85mA Supply Current, IMD3 = –61dBc at 300MHz
V
A = 20dB, 90mA Supply Current, IMD3 = –65dBc at 300MHz
V
A = 26dB, 85mA Supply Current, IMD3 = –71dBc at 300MHz
V
A = 8dB, 45mA Supply Current, IMD3 = –80dBc at 140MHz
V
A = 14dB, 45mA Supply Current, IMD3 = –81dBc at 140MHz
V
A = 20dB, 50mA Supply Current, IMD3 = –74dBc at 140MHz
V
A = 26dB, 45mA Supply Current, IMD3 = –72dBc at 140MHz
V
A = 6dB, Distortion < –80dBc at 25MHz
V
LT6402-12
LT6402-20
LTC6404-1
LTC6406
300MHz Differential Amplifier/ADC Driver
A = 12dB, Distortion < –80dBc at 25MHz
V
300MHz Differential Amplifier/ADC Driver
A = 20dB, Distortion < –80dBc at 25MHz
V
600MHz Low Noise Differential ADC Driver
e = 1.5nV/√Hz, Rail-to-Rail Outputs
n
3GHz Rail-to-Rail Input Differential Op Amp
1.6nV/√Hz Noise, –72dBc Distortion at 50MHz, 18mA
LT6411
Low Power Differential ADC Driver/Dual Selectable Gain Amplifier 16mA Supply Current, IMD3 = –83dBc at 70MHz, A = 1, –1 or 2
V
High-Speed Single-Ended Output Op Amps
LT1812/LT1813/ High Slew Rate Low Cost Single/Dual/Quad Op Amps
LT1814
8nV/√Hz Noise, 750V/μs, 3mA Supply Current
6nV/√Hz Noise, 1500V/μs, 6.5mA Supply Current
LT1815/LT1816/ Very High Slew Rate Low Cost Single/Dual/Quad Op Amps
LT1817
LT1818/LT1819 Ultra High Slew Rate Low Cost Single/Dual Op Amps
LT6200/LT6201 Rail-to-Rail Input and Output Low Noise Single/Dual Op Amps
LT6202/LT6203/ Rail-to-Rail Input and Output Low Noise Single/Dual/Quad
6nV/√Hz Noise, 2500V/μs, 9mA Supply Current
0.95nV/√Hz Noise, 165MHz GBW, Distortion = –80dBc at 1MHz
1.9nV/√Hz Noise, 3mA Supply Current, 100MHz GBW
LT6204
Op Amps
LT6230/LT6231/ Rail-to-Rail Output Low Noise Single/Dual/Quad Op Amps
LT6232
1.1nV/√Hz Noise, 3.5mA Supply Current, 215MHz GBW
1.9nV/√Hz Noise, 1.2mA Supply Current, 60MHz GBW
LT6233/LT6234/ Rail-to-Rail Output Low Noise Single/Dual/Quad Op Amps
LT6235
Integrated Filters
LTC1562-2
LT1568
Very Low Noise, 8th Order Filter Building Block
Very Low Noise, 4th Order Filter Building Block
Linear Phase, Tunable 10th Order Lowpass Filter
Very Low Noise Differential 2.5MHz Lowpass Filter
Very Low Noise Differential 5MHz Lowpass Filter
Very Low Noise Differential 10MHz Lowpass Filter
Very Low Noise Differential 15MHz Lowpass Filter
Very Low Noise Differential 20MHz Lowpass Filter
Lowpass and Bandpass Filters up to 300kHz
Lowpass and Bandpass Filters up to 10MHz
Single-Resistor Programmable Cut-Off to 300kHz
SNR = 86dB at 3V Supply, 4th Order Filter
SNR = 82dB at 3V Supply, 4th Order Filter
SNR = 82dB at 3V Supply, 4th Order Filter
SNR = 76dB at 3V Supply, 4th Order Filter
SNR = 76dB at 3V Supply, 4th Order Filter
LTC1569-7
LT6600-2.5
LT6600-5
LT6600-10
LT6600-15
LT6600-20
640014fb
LT 0908 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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