LTC6400IUD-20-PBF [Linear]
1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF; 1.8GHz的低噪声，低失真差分ADC驱动器为300MHz的IF
| 型号： | LTC6400IUD-20-PBF |
| 厂家： | 
Linear |
| 描述： | 1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF |
| 文件： | 总16页 (文件大小：226K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC6400-20
1.8GHz Low Noise, Low
Distortion Differential ADC
Driver for 300MHz IF
FEATURES
DESCRIPTION
The LTC®6400-20 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.
■
1.8GHz –3dB Bandwidth
■
Fixed Gain of 10V/V (20dB)
■
–94dBc IMD at 70MHz (Equivalent OIP3 = 51dBm)
3
■
–65dBc IMD at 300MHz (Equivalent OIP3 = 36.5dBm)
3
■
1nV/√Hz Internal Op Amp Noise
■
2.1nV/√Hz Total Input Noise
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).
■
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,
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.
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.4V
■
■
P-P
■
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS
■
Differential ADC Driver
■
Differential Driver/Receiver
■
Single Ended to Differential Conversion
IF Sampling Receivers
■
■
SAW Filter Interfacing
TYPICAL APPLICATION
Equivalent Output IP3 vs
Frequency
Single-Ended to Differential ADC Driver
60
(NOTE 7)
3.3V
1.25V
50
0.1μF
1000pF
0.1μF
40
+
V
0.1μF
0.1μF
V
30
20
10
0
OCM
10Ω
10Ω
V
V
DD
CM
+
INPUT
+IN
+OUT
AIN
AIN
+OUTF
66.5Ω
LTC6400-20
LTC2208
–OUTF
–OUT
–
–IN
ENABLE
–
V
29Ω
LTC2208 130Msps
16-Bit ADC
20dB GAIN
0
50
100
150
200
250
300
FREQUENCY (MHz)
640020 TA01a
640020 TA01b
640020f
1
LTC6400-20
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 × 3mm) PLASTIC QFN
= 125°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-20#PBF
LTC6400IUD-20#PBF
TAPE AND REEL
LTC6400CUD-20#TRPBF LCCS
LTC6400IUD-20#TRPBF LCCS
PART MARKING*
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 Please check each datasheet for complete details.
PART NUMBER
GAIN
(dB)
GAIN
(V/V)
Z
IN
(DIFFERENTIAL)
I
S
(mA)
(Ω)
LTC6400-20
LTC6401-20
20
20
10
10
200
200
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.
640020f
2
LTC6400-20
DC ELECTRICAL CHARACTERISTICS The ● 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
20.6
150
UNITS
Input/Output Characteristic
●
●
●
●
●
●
●
●
G
DIFF
Gain
V
V
=
=
100mV Differential
100mV Differential
19.4
20
–1.5
80
dB
mdB/°C
mV
IN
TC
GAIN
Gain Temperature Drift
IN
V
V
V
Output Swing Low
Each Output, V
Each Output, V
=
=
600mV Differential
600mV Differential
SWINGMIN
SWINGMAX
OUTDIFFMAX
OUT
IN
IN
Output Swing High
2.35
2.46
4.4
V
Maximum Differential Output Swing
Output Current Drive
1dB Compressed
Each Output
V
P-P
I
20
–2
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)
2
1
OSDIFF
TCV
T
MIN
to T
MAX
1.2
OSDIFF
VRMIN
VRMAX
I
I
1.6
V
●
Ω
R
Differential
170
200
1
230
INDIFF
INDIFF
C
Differential, Includes Parasitic
Differential
pF
●
●
Ω
R
R
18
85
25
32
OUTDIFF
OUTFDIFF
OUTFDIFF
Ω
Differential
100
2.7
65
115
C
Filtered Output Capacitance (+OUTF, –OUTF) Differential, Includes Parasitic
Common Mode Rejection Ratio Input Common Mode Voltage 1.1V~1.4V
Output Common Mode Voltage Control
pF
●
CMRR
45
dB
G
Common Mode Gain
V
OCM
= 1V to 1.6V
1
V/V
CM
V
V
V
Output Common Mode Range, MIN
1
V
V
OCMMIN
●
1.1
Output Common Mode Range, MAX
1.6
1.5
V
V
OCMMAX
●
●
●
●
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
16
5
OSCM
MAX
IV
V
Input Current
OCM
OCM
ENABLE Pin
●
●
●
●
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
1.2
Power Supply
●
●
●
●
V
Operating Supply Range
Supply Current
2.85
75
3
90
1
3.5
105
3
V
mA
mA
dB
S
I
I
ENABLE = 0.8V
ENABLE = 2.4V
S
Shutdown Supply Current
SHDN
+
PSRR
Power Supply Rejection Ratio (Differential
Outputs)
V = 2.85V to 3.5V
55
86
640020f
3
LTC6400-20
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
1.84
0.3
0.7
10.5
4.5
0.8
4
MAX
UNITS
GHz
GHz
GHz
kHz
V/ns
ns
–3dB Bandwidth
200mV
200mV
200mV
(Note 6)
(Note 6)
(Note 6)
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)
t
t
t
t
1% Settling Time
Overdrive Recovery Time
Turn-On Time
S1%
OVDR
ON
P-P,OUT
1.9V
(Note 6)
ns
P-P,OUT
+OUT, –OUT Within 10% of Final Values
Falls to 10% of Nominal
82
ns
Turn-Off Time
I
190
15
ns
OFF
CC
–3dBBW
V
Pin Small Signal –3dB BW
0.1V at V , Measured Single-Ended at
OCM
MHz
VOCM
OCM
P-P
Output (Note 6)
10MHz Input Signal
HD /HD
Second/Third Order Harmonic
Distortion
2V
2V
2V
2V
2V
2V
2V
, R = 400Ω
–97/–93
–98/–97
–100/–98
–95
dBc
dBc
dBc
dBc
dBc
dBc
dBm
2,10M
3,10M
P-P,OUT
L
, No R
P-P,OUT
L
, No R
P-P,OUTFILT
L
IMD
Third-Order Intermodulation
(f1 = 9.5MHz f2 = 10.5MHz)
Composite, R = 400Ω
P-P,OUT L
3,10M
Composite, No R
–99
P-P,OUT
L
Composite, No R
–100
P-P,OUTFILT
L
OIP
Third-Order Output Intercept Point
(f1 = 9.5MHz f2 = 10.5MHz)
Composite, No R (Note 7)
53.8
3,10M
P-P,OUT
L
P
1dB Compression Point
Noise Figure
R = 375Ω (Notes 5, 7)
18
6.2
dBm
dB
1dB,10M
L
NF
R = 375Ω (Note 5)
L
10M
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.2
nV/√Hz
nV/√Hz
IN,10M
ON,10M
21.7
70MHz Input Signal
HD /HD
Second/Third Order Harmonic
Distortion
2V
2V
2V
2V
2V
2V
2V
, R = 400Ω
–86/–85
–88/–87
–86/–88
–93
dBc
dBc
dBc
dBc
dBc
dBc
dBm
2,70M
3,70M
P-P,OUT
L
, No R
P-P,OUT
L
, No R
P-P,OUTFILT
L
IMD
Third-Order Intermodulation
(f1 = 69.5MHz f2 = 70.5MHz)
Composite, R = 400Ω
P-P,OUT L
3,70M
Composite, No R
–94
P-P,OUT
L
Composite, No R
–93
P-P,OUTFILT
L
OIP
Third-Order Output Intercept Point
(f1 = 69.5MHz f2 = 70.5MHz)
Composite, No R (Note 7)
51
3,70M
P-P,OUT
L
P
1dB Compression Point
Noise Figure
R = 375Ω (Notes 5, 7)
18
6.2
2.1
21
dBm
dB
1dB,70M
L
NF
R = 375Ω (Note 5)
L
70M
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,70M
ON,70M
640020f
4
LTC6400-20
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
HD
/HD
Second/Third Order Harmonic
Distortion
2V
2V
2V
2V
2V
2V
2V
, R = 400Ω
–74/–74
–73/–83
–77/–76
–93
dBc
dBc
dBc
dBc
dBc
dBc
dBm
2,140M
3,140M
P-P,OUT
L
, No R
P-P,OUT
L
, No R
P-P,OUTFILT
L
IMD
Third-Order Intermodulation
(f1 = 139.5MHz f2 = 140.5MHz)
Composite, R = 400Ω
P-P,OUT L
3,140M
Composite, No R
–87
P-P,OUT
L
Composite, No R
–89
P-P,OUTFILT
L
OIP
Third-Order Output Intercept Point
(f1 = 139.5MHz f2 = 140.5MHz)
Composite, No R (Notes 7)
47.7
3,140M
P-P,OUT
L
P
1dB Compression Point
Noise Figure
R = 375Ω (Notes 5, 7)
18.4
6.5
dBm
dB
1dB,140M
L
NF
R = 375Ω (Note 5)
L
140M
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
2.1
nV/√Hz
nV/√Hz
IN,140M
ON,140M
21.5
240MHz Input Signal
HD /HD
Second-Order Harmonic Distortion
2V
2V
2V
2V
2V
2V
2V
, R = 400Ω
–66/–58
–65/–63
–65/–58
–71
dBc
dBc
dBc
dBc
dBc
dBc
dBm
2,240M
3,240M
P-P,OUT
L
, No R
P-P,OUT
L
, No R
P-P,OUTFILT
L
IMD
Third-Order Intermodulation
(f1 = 239.5MHz f2 = 240.5MHz)
Composite, R = 400Ω
P-P,OUT L
3,240M
Composite, No R
–74
P-P,OUT
L
Composite, No R
–67
P-P,OUTFILT
L
OIP
Third-Order Output Intercept Point
(f1 = 239.5MHz f2 = 240.5MHz)
Composite, No R (Note 7)
41
3,240M
P-P,OUT
L
P
1dB Compression Point
Noise Figure
R = 375Ω (Notes 5, 7)
17.9
7.1
dBm
dB
1dB,240M
L
NF
R = 375Ω (Note 5)
L
240M
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
1.9
nV/√Hz
nV/√Hz
N, 240M
ON,240M
21.7
640020f
5
LTC6400-20
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
HD
/HD
Second-Order Harmonic Distortion
2V
2V
2V
2V
2V
2V
2V
, R = 400Ω
–61/–53
–60/–55
–63/–46
–64
dBc
dBc
dBc
dBc
dBc
dBc
dBm
2,300M
3,300M
P-P,OUT
L
, No R
P-P,OUT
L
, No R
P-P,OUTFILT
L
IMD
Third-Order Intermodulation
(f1 = 299.5MHz f2 = 300.5MHz)
Composite, R = 400Ω
P-P,OUT L
3,300M
Composite, No R
–65
P-P,OUT
L
Composite, No R
–58
P-P,OUTFILT
L
OIP
Third-Order Output Intercept Point
(f1 = 299.5MHz f2 = 300.5MHz)
Composite, No R (Note 7)
36.6
3,300M
P-P,OUT
L
P
1dB Compression Point
Noise Figure
R = 375Ω (Notes 5, 7)
17.5
7.5
1.8
22
dBm
dB
1dB,300M
L
NF
R = 375Ω (Note 5)
L
300M
N,300M
ON,300M
e
e
Input Referred Voltage Noise Density Includes Resistors (Short Inputs)
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
nV/√Hz
nV/√Hz
dBc
IMD
Third-Order Intermodulation
(f1 = 280MHz f2 = 320MHz) Measure
at 360MHz
2V
P-P,OUT
Composite, R = 375Ω
–64
–70
3,280M/320M
L
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.
performance from –40°C 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.
Note 5: Input and output baluns used. See Test Circuit A.
Note 6: Measured using Test Circuit B.
Note 7: Since the LTC6400-20 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
LTC6400-20 with amplifiers that require 50Ω output load, the LTC6400-20
Note 3: The LTC6400C and LTC6400I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
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
output voltage swing driving a given R is converted to OIP and P as
if it were driving a 50Ω load. Using this modified convention, 2V is by
P-P
L 3 1dB
definition equal to 10dBm, regardless of actual R .
L
640020f
6
LTC6400-20
TYPICAL PERFORMANCE CHARACTERISTICS
S21 Phase and Group Delay vs
Frequency
Frequency Response
Gain 0.1dB Flatness
25
20
15
10
5
1.0
0.8
0
–100
–200
–300
–400
1.2
0.9
0.6
0.3
0
TEST CIRCUIT B
TEST CIRCUIT B
TEST CIRCUIT B
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
PHASE
GROUP DELAY
0
10
100
1000
3000
10
100
1000
3000
0
200
400
600
800
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
640020 G03
640020 G01
640020 G02
Input and Output Reflection and
Reverse Isolation vs Frequency
Input and Output Impedance vs
Frequency
PSRR and CMRR vs Frequency
0
250
200
150
100
50
50
100
90
80
70
60
50
40
30
20
10
0
TEST CIRCUIT B
–10
–20
–30
–40
–50
–60
–70
–80
Z
IN
30
PSRR
CMRR
S11
S22
Z
OUT
10
Z
IN
–10
–30
–50
PHASE
IMPEDANCE MAGNITUDE
S12
Z
OUT
0
10
100
1000
3000
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
640020 G04
640020 G05
640020 G06
Noise Figure and Input Referred
Noise Voltage vs Frequency
Small Signal Transient Response
Large Signal Transient Response
15
14
13
12
11
10
9
8
7
6
5
6
4
2
1.35
1.30
1.25
1.20
1.15
2.5
2.0
1.5
1.0
0.5
0
R
= 87.5Ω PER OUTPUT
R
= 87.5Ω PER OUTPUT
L
L
+OUT
+OUT
NOISE FIGURE
EN
4
3
2
1
–OUT
–OUT
0
0
1000
10
100
0
2
4
6
8
10
0
2
4
6
8
10
TIME (ns)
TIME (ns)
FREQUENCY (MHz)
640020 G08
640020 G09
640020 G07
640020f
7
LTC6400-20
TYPICAL PERFORMANCE CHARACTERISTICS
1% Settling Time for 2V
Output Step
Harmonic Distortion (Unfiltered)
vs Frequency
Overdrive Recovery Time
2.5
2.0
1.5
1.0
0.5
0
5
4
–40
–50
–60
–70
–80
–90
–100
R
= 87.5Ω PER OUTPUT
R
= 87.5Ω PER OUTPUT
L
DIFFERENTIAL INPUT
L
V
= 2V
OUT
P-P
+OUT
3
2
1
0
–1
–2
–3
–4
–5
HD2 NO R
L
HD2 200Ω R
–OUT
L
HD3 NO R
HD3 200Ω R
L
L
0
50
100
150
200
0
0.5
1.0
1.5
2.0
2.5
3.0
0
50
100
150
200
250
300
TIME (ns)
TIME (ns)
FREQUENCY (MHz)
640020 G10
640020 G11
640020 G12
Harmonic Distortion (Filtered) vs
Frequency
Third Order Intermodulation
Distortion vs Frequency
Harmonic Distortion (Unfiltered)
vs Frequency
–40
–50
–60
–70
–80
–90
–100
–40
–50
–40
–50
–60
–70
–80
–90
–100
DIFFERENTIAL INPUT
UNFILTERED NO R
SINGLE-ENDED INPUT
L
V
= 2V
L
UNFILTERED 200Ω R
V
= 2V
OUT P-P
OUT
P-P
L
NO R
FILTERED NO R
L
–60
–70
–80
–90
HD2 NO R
L
HD2 200Ω R
L
–100
–110
DIFFERENTIAL INPUT
HD3 NO R
L
HD3 200Ω R
HD2
HD3
V
= 2V COMPOSITE
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)
640020 G13
640020 G14
640020 G15
Harmonic Distortion vs Output
Common Mode Voltage
(Unfiltered Outputs)
Harmonic Distortion (Filtered) vs
Frequency
Third Order Intermodulation
Distortion vs Frequency
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
SINGLE-ENDED INPUT
UNFILTERED NO R
V
= 2V at 100MHz
OUT P-P
L
V
= 2V
L
UNFILTERED 200Ω R
R = 400Ω
L
OUT
P-P
L
NO R
FILTERED NO R
L
HD3
HD2
SINGLE-ENDED INPUT
HD2
HD3
V
= 2V COMPOSITE
OUT
P-P
0
50
100
150
200
250
300
0
50
100
150
200
250
300
1.0
1.1
1.2
1.3
1.4
1.5
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT COMMON MODE VOLTAGE (V)
640020 G16
640020 G17
640020 G18
640020f
8
LTC6400-20
TYPICAL PERFORMANCE CHARACTERISTICS
Output 1dB Compression Point vs
Frequency
Output Third Order Intercept vs
Frequency
20
19
18
17
16
15
60
50
40
30
20
10
0
DIFFERENTIAL INPUT
R
= 400Ω
L
(NOTE 7)
DIFFERENTIAL INPUT
= 2V COMPOSITE
V
OUT
P-P
(NOTE 7)
UNFILTERED NO R
L
UNFILTERED 200Ω R
L
FILTERED NO R
L
50
100
150
200
250
300
0
50
100
150
200
250
300
FREQUENCY (MHz)
FREQUENCY (MHz)
640020 G19
640020 G20
Turn-On Time
Turn-Off Time
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
140
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
140
R
= 87.5Ω PER OUTPUT
L
120
100
80
120
100
80
I
CC
–OUT
–OUT
60
60
40
40
+OUT
20
20
+OUT
100
I
CC
0
0
ENABLE
ENABLE
400
R
= 87.5Ω PER OUTPUT
L
–0.5
–20
–0.5
–20
–100
0
100
200
TIME (ns)
300
500
–100
0
200
TIME (ns)
300
400
500
640020 G21
640020 G22
640020f
9
LTC6400-20
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. Bypass each pin with 1000pF and 0.1μF capaci-
tors 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
1000Ω
100Ω
12.5Ω
8
7
R
FILT
+OUTF
50Ω
+IN
–IN
IN+
IN–
OUT–
14
15
C
FILT
R
FILT
1.7pF
–OUTF
–OUT
50Ω
6
5
OUT+
R
R
G
100Ω
R
OUT
12.5Ω
F
–IN
16
1000Ω
2k
COMMON
MODE CONTROL
5.3pF
640020 BD
1
2
3
4
+
+
–
V
V
V
V
OCM
640020f
10
LTC6400-20
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 LTC6400-20 for frequency selection and/or noise
reduction.
The LTC6400 is a low noise and low distortion fully dif-
ferential op amp/ADC driver with:
• Operation from DC to 1.8GHz (–3dB bandwidth)
• Fixed gain of 10V/V (20dB)
• 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,LTC6400-20canbeeasilyconfigured
for single-ended input and differential output without a
balun. The signal is fed to one of the inputs through a
matching network while the other input is connected to
thesamematchingnetworkandasourceresistor.Because
the return ratios of the two feedback paths are equal, the
two outputs have the same gain and thus symmetrical
Filter resistors of 50Ω are available for additional filtering.
Lowpass/bandpassfiltersareeasilyimplementedwithjust
a couple of external components. Moreover, they offer
single-ended 50Ω matching in wideband applications and
no external resistor is needed.
LTC6400-20
1000Ω
25Ω
100Ω
12.5Ω
50Ω
13 +IN
14 +IN
+OUT
8
7
IN+
IN–
OUT–
+OUTF
V
IN
+
66.5Ω
–
50Ω
1.7pF
The LTC6400-20 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 1.6V for proper operation. If the
inputs are AC-coupled, the input common mode voltage
15 –IN
16 –IN
–OUTF
6
5
OUT+
1000Ω
25Ω
100Ω
12.5Ω
–OUT
640020 F01
Figure 1. Input Termination for Differential 50Ω Input Impedance
Using Shunt Resistor
is automatically biased close to V
and thus no external
OCM
circuitry is needed for bias. The LTC6400-20 provides an
output common mode voltage set by V , which allows
drivinganADCdirectlywithoutexternalcomponentssuch
as a transformer or AC coupling capacitors. The input
signal can be either single-ended or differential with only
minor differences in distortion performance.
LTC6400-20
1000Ω
25Ω
100Ω
12.5Ω
50Ω
OCM
13 +IN
+OUT
8
7
1:4
• •
IN+
IN–
OUT–
+OUTF
V
IN
14 +IN
15 –IN
+
–
50Ω
1.7pF
–OUTF
6
5
OUT+
1000Ω
Input Impedance and Matching
25Ω
100Ω
12.5Ω
16 –IN
–OUT
640020 F02
The differential input impedance of the LTC6400-20 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
640020f
11
LTC6400-20
APPLICATIONS INFORMATION
R
S
LTC6400-20
Output Match and Filter
0.1μF
1000Ω
50Ω
100Ω
12.5Ω
13 +IN
+OUT
8
7
V
The LTC6400-20 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–
66.5Ω
+OUTF
14 +IN
15 –IN
0.1μF
50Ω
1.7pF
–OUTF
6
5
OUT+
1000Ω
R
S
0.1μF
50Ω
100Ω
12.5Ω
16 –IN
–OUT
640020 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 components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
filter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
66.5Ω
Figure 3. Input Termination for Single-Ended 50Ω Input
Impedance
swing. 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
that the single-ended input impedance is 202Ω and R is
T
Output Common Mode Adjustment
66.5Ω in order to match to a 50Ω source impedance.
The output common mode voltage is set by the V
pin,
The LTC6400-20 is unconditionally stable. However, the
overall differential gain is affected by both source imped-
ance and load impedance as shown in Figure 4:
OCM
whichisahighimpedanceinput.Theoutputcommonmode
voltage is capable of tracking V in a range from 1V to
OCM
VOUT
RL
RS + 200 25+RL
2000
LTC6400-20
+OUT
AV =
=
•
1000Ω
100Ω
12.5Ω
50Ω
V
IN
13 +IN
8
7
8.2pF
FILTERED OUTPUT
IN+
IN–
OUT–
+OUTF
The noise performance of the LTC6400-20 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.
14 +IN
15 –IN
12pF
(87.5MHz)
50Ω
1.7pF
–OUTF
6
5
OUT+
1000Ω
8.2pF
100Ω
12.5Ω
16 –IN
–OUT
640020 F05
Figure 5. LTC6400-20 Internal Filter Topology Modified for Low
Filter Bandwidth (Three External Capacitors)
39pF
LTC6400-20
1000Ω
100Ω
12.5Ω
10Ω
4.99Ω
LTC6400-20
1000Ω
1/2 R
100Ω
12.5Ω
50Ω
1/2 R
L
13 +IN
+OUT
8
7
S
50Ω
13 +IN
+OUT
8
7
IN+
IN–
OUT–
+OUTF
14 +IN
15 –IN
IN+
IN–
OUT–
16nH
LTC2208
+OUTF
V
IN
1.7pF
39pF
14 +IN
15 –IN
50Ω
V
OUT
+
–
50Ω
1.7pF
OUT+
1000Ω
–OUTF
6
5
–OUTF
6
5
OUT+
1000Ω
100Ω
12.5Ω
10Ω
4.99Ω
1/2 R
100Ω
12.5Ω
1/2 R
16 –IN
–OUT
S
L
39pF
640020 F06
16 –IN
–OUT
640020 F04
Figure 6. LTC6400-20 Internal Filter Topology Modified
for Bandpass Filtering (Three External Capacitors, One
External Inductor)
Figure 4. Calculate Differential Gain
640020f
12
LTC6400-20
APPLICATIONS INFORMATION
94
92
90
88
86
84
82
1.6V. The bandwidth of V
control is typically 15MHz,
OCM
which is dominated by a low pass filter connected to the
pin and is aimed to reduce common mode noise
V
OCM
generation at the outputs. The internal common mode
feedback loop has a –3dB bandwidth around 300MHz,
allowing fast common mode rejection at the outputs of
the LTC6400-20. The V
pin should be tied to a DC bias
OCM
voltage with a 0.1μF bypass capacitor. When interfacing
with A/D converters such as the LT22xx families, the V
OCM
pin can be connected to the V pin of the ADC.
CM
70
120
170
220
270 300
FREQUENCY (MHz)
Driving A/D Converters
640020 F08
The LTC6400-20 has been specifically designed to inter-
face directly with high speed A/D converters. In Figure 7,
an example schematic shows the LTC6400-20 with a
single-ended input driving the LTC2208, which is a 16-bit,
130Msps ADC. Two external 10Ω resistors help eliminate
potential resonance associated with stray capacitance of
PCB traces and bond wires of either the ADC input or
Figure 8. SFDR for the Combination of LTC6400-20 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)
for single-ended-to-differential conversion and imped-
ance transformation, allowing direct hook-up to a 2-port
the driver output. V
of the LTC6400-20 is connected
OCM
to V of the LTC2208 V pin at 1.25V. Alternatively, a
CM
CM
single-ended input signal can be converted to differential
signal via a balun and fed to the input of the LTC6400-20.
The balun also converts input impedance to match 50Ω
source impedance.
Top Silkscreen
Figure 8 summarizes the spurious free dynamic range
(SFDR) for IMD3 of the whole system in Figure 7.
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
10Ω
10Ω
+IN
V
–
+
CM
IF IN
66.5Ω
+OUT
AIN
AIN
+OUTF
LTC6400-20
LTC2208
0.1μF
–OUTF
–IN
ENABLE
–OUT
29Ω
LTC2208 130Msps
16-Bit ADC
20dB GAIN
640020 F07
Figure 7. Single-Ended Input to LTC6400-20 and LTC2208
640020f
13
LTC6400-20
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 1.8GHz to approximately 1.3GHz.
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 cir-
cuitry, for 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
+OUTF
–OUTF
–OUT
R6
0Ω
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
T2
C21
0.1μF
R24
(1)
SL1
(2)
SL2
(2)
R7
(1)
LTC6400-20
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
OCM
V
V
0.1μF
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
-C
SL = SIGNAL LEVEL
IC
R3
R4
T1
SL1
SL2
SL3
TP3
GND
LTC6400CUD-20 OPEN OPEN MINI-CIRCUITS TCM4-19 (1:4) 6dB
20dB 14dB
640020 TA03
640020f
14
LTC6400-20
TYPICAL APPLICATIONS
Test Circuit B, 4-Port Analysis
+
V
1000pF
0.1μF
–
+
–
V
V
ENABLE
V
12
G
11
10
9
BIAS CONTROL
R
F
1000Ω
R
R
OUT
12.5Ω
+IN
13
+OUT
100Ω
37.4Ω
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
1.7pF
R
50Ω
FILT
200Ω
–OUTF
–OUT
6
5
OUT+
R
R
G
100Ω
R
OUT
12.5Ω
F
–IN
16
1000Ω
37.4Ω
PORT 2
(50Ω)
PORT 4
(50Ω)
0.1μF
0.1μF
COMMON
MODE CONTROL
640020 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
640020f
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
LTC6400-20
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LT6202/LT6203/ Rail-to-Rail Input and Output Low Noise Single/Dual/Quad
LT6204 Op Amps
1.9nV/√Hz Noise, 3mA Supply Current, 100MHz GBW
1.1nV/√Hz Noise, 3.5mA Supply Current, 215MHz GBW
1.9nV/√Hz Noise, 1.2mA Supply Current, 60MHz GBW
LT6230/LT6231/ Rail-to-Rail Output Low Noise Single/Dual/Quad Op Amps
LT6232
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
640020f
LT 0707 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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© LINEAR TECHNOLOGY CORPORATION 2007
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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