LTC2165 [Linear]
50Ω Gain Block IF Amplifier n 20MHz to 1700MHz Bandwidth;
| 型号： | LTC2165 |
| 厂家： | 
Linear |
| 描述： | 50Ω Gain Block IF Amplifier n 20MHz to 1700MHz Bandwidth |
| 文件： | 总16页 (文件大小：635K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC6431-15
50Ω
Gain Block
IF Amplifier
FeaTures
DescripTion
The LTC®6431-15 is a gain-block amplifier with excellent
linearity at frequencies beyond 1000MHz and with low
associated output noise.
n
20MHz to 1700MHz Bandwidth
n
15.5dB Power Gain
n
47dBm OIP3 at 240MHz into a 50Ω Load
n
NF = 3.33dB at 240MHz
The unique combination of high linearity, low noise and
low power dissipation make this an ideal candidate for
many signal-chain applications. The LTC6431-15 is easy
to use, requiring a minimum of external components. It is
internally input/output matched to 50Ω and it draws only
90mA from a single 5V supply.
n
1nV/√Hz Total Input Noise
n
S11 < –15dB Up to 1.2GHz
n
S22 < –15dB Up to 1.2GHz
n
>2V Linear Output Swing
P-P
n
n
n
n
n
n
n
n
P1dB = 20.6dBm
DC Power = 450mW
50Ω Single-Ended Operation
On-chip bias and temperature compensation maintain
performance over environmental changes.
Insensitive to V Variation
CC
A-Grade 100% OIP3 Tested at 240MHz
Input/Output Internally Matched to 50Ω
Single 5V Supply
The LTC6431-15 uses a high performance SiGe BiCMOS
process for excellent repeatability compared with similar
GaAsamplifiers.AllA-gradeLTC6431-15devicesaretested
and guaranteed for OIP3 at 240MHz. The LTC6431-15 is
housed in a 4mm × 4mm 24-lead QFN package with an
exposedpadforthermalmanagementandlowinductance.
Unconditionally Stable
applicaTions
n
Single-Ended IF Amplifier
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n
ADC Driver
n
CATV
Typical applicaTion
Single-Ended IF Amplifier
OIP3 vs Frequency
50
5V
48
46
R
F
V
CC
= 5V
CHOKE,
560nH
1000pF
1000pF
44
42
40
LTC6431-15
R
R
SOURCE
LOAD
50Ω
50Ω
V
P
= 5V, T = 25°C
CC
643115 TA01a
= 2dBm/TONE
OUT
38
36
f
= 1MHz
OUT
SPACE
Z
IN
= Z
= 50Ω
400
600
800
1000
0
200
FREQUENCY (MHz)
643115 TA01b
643115f
1
LTC6431-15
absoluTe MaxiMuM raTings
pin conFiguraTion
TOP VIEW
(Note 1)
Total Supply Voltage (V to GND)...........................5.5V
CC
Amplifier Output Current (OUT) ...........................105mA
RF Input Power, Continuous, 50Ω (Note 2)..........15dBm
RF Input Power, 100µs Pulse, 50Ω (Note 2) ........20dBm
Operating Case Temperature
24 23 22 21 20 19
DNC
DNC
DNC
DNC
DNC
DNC
1
2
3
4
5
6
18 OUT
GND
17
16
T_DIODE
25
GND
Range (T
)..........................................–40°C to 85°C
CASE
15 DNC
DNC
Storage Temperature Range .................. –65°C to 150°C
14
13 DNC
Junction Temperature (T ) .................................... 150°C
J
7
8
9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T
= 150°C, θ = 54°C/W
JC
JMAX
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC6431AIUF-15#PBF
LTC6431BIUF-15#PBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 85°C
LTC6431AIUF-15#TRPBF 43115
LTC6431BIUF-15#TRPBF 43115
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
–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 nonstandard 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/
Dc elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 5V, ZSOURCE = ZLOAD = 50Ω. Typical measured DC electrical
performance using Test Circuit A.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
5.0
MAX
UNITS
V
Operating Supply Range
Total Supply Current
4.75
5.25
V
S
I
I
I
All V Pins Plus OUT
75
67
85.1
100
112
mA
mA
S,TOT
CC
l
l
l
Total Supply Current to OUT Pin
Current to OUT
62
55
71
14
92
95
mA
mA
S,OUT
Current to V Pin
Either V Pin May Be Used
12
12.5
16
16.5
mA
mA
CC,OUT
CC
CC
643115f
2
LTC6431-15
ac elecTrical characTerisTics TA = 25°C (Note 3), VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless otherwise
noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
SYMBOL PARAMETER
Small Signal
CONDITIONS
MIN
TYP
MAX
UNITS
BW
–3dB Bandwidth
De-Embedded to Package (Low Frequency
Cutoff 20MHz)
2000
MHz
S11
S21
S12
S22
Input Return Loss, 20MHz to 2000MHz
Forward Power Gain, 50MHz to 300MHz
Reverse Isolation, 20MHz to 3000MHz
Output Return Loss, 20MHz to 1700MHz
De-Embedded to Package
De-Embedded to Package
De-Embedded to Package
De-Embedded to Package
–10
15.5
–19
–10
dB
dB
dB
dB
Frequency = 50MHz
S21
Power Gain
De-Embedded to Package
15.5
dB
OIP3
Output Third-Order Intercept Point
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
46.0
45.0
dBm
dBm
OUT
f
IM3
Third-Order Intermodulation
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–88.0
–86.0
dBc
dBc
OUT
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–58.0
–88.0
20.5
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.06
Frequency = 140MHz
S21
Power Gain
De-Embedded to Package
15.5
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
47.0
46.0
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–90.0
–88.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–58.0
–88.0
20.7
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
De-Embedded to Package
3.20
Frequency = 240MHz
S21
OIP3
IM3
Power Gain
14.5
14.2
15.6
16.5
16.7
dB
dB
l
Output Third-Order Intercept Point
Third-Order Intermodulation
P
= 2dBm/Tone, Δ = 8MHz
A-Grade
B-Grade
44.0
47.0
45.5
dBm
dBm
OUT
OUT
f
P
= 2dBm/Tone, Δ = 8MHz
A-Grade
B-Grade
–84
–90.0
–87.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–59.0
–88.0
20.6
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.33
643115f
3
LTC6431-15
ac elecTrical characTerisTics TA = 25°C (Note 3), VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless otherwise
noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
SYMBOL PARAMETER
Frequency = 300MHz
CONDITIONS
MIN
TYP
MAX
UNITS
S21
Power Gain
De-Embedded to Package
15.5
dB
OIP3
Output Third-Order Intercept Point
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
46.5
45.5
dBm
dBm
OUT
f
IM3
Third-Order Intermodulation
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–89.0
–87.0
dBc
dBc
OUT
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–60.0
–86.0
20.6
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.41
Frequency = 380MHz
S21
Power Gain
De-Embedded to Package
15.4
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
46.0
45.0
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–88.0
–86.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–57.0
–87.0
20.6
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.48
Frequency = 500MHz
S21
Power Gain
De-Embedded to Package
15.3
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
44.5
43.5
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–85.0
–83.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–55.6
–77.0
20.6
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.60
Frequency = 600MHz
S21
Power Gain
De-Embedded to Package
15.3
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
41.5
40.5
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–79.0
–77.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–53.6
–69.0
20.6
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.67
643115f
4
LTC6431-15
ac elecTrical characTerisTics TA = 25°C (Note 3), VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless otherwise
noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
SYMBOL PARAMETER
Frequency = 700MHz
CONDITIONS
MIN
TYP
MAX
UNITS
S21
Power Gain
De-Embedded to Package
15.2
dB
OIP3
Output Third-Order Intercept Point
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
40.0
39.0
dBm
dBm
OUT
f
IM3
Third-Order Intermodulation
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–76.0
–74.0
dBc
dBc
OUT
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–51.9
–69.0
20.3
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.75
Frequency = 800MHz
S21
Power Gain
De-Embedded to Package
15.2
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
39.0
38.0
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–74
–72
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–49.2
–65.0
20.1
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.83
Frequency = 900MHz
S21
Power Gain
De-Embedded to Package
15.1
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
38.5
37.5
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–73.0
–71.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–46.7
–63.0
19.9
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.90
Frequency = 1000MHz
S21
Power Gain
De-Embedded to Package
15.0
dB
OIP3
Output Third-Order Intercept Point
P
P
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
38.0
37.0
dBm
dBm
OUT
OUT
f
IM3
Third-Order Intermodulation
= 2dBm/Tone, Δ = 1MHz
A-Grade
B-Grade
–72.0
–70.0
dBc
dBc
f
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
P
P
= 6dBm
= 6dBm
–45.0
–59.0
19.5
dBc
dBc
dBm
dB
OUT
OUT
De-Embedded to Package
3.99
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 3: The LTC6431-15 is guaranteed functional over the case operating
temperature range of –40°C to 85°C.
Note 4: Small-signal parameters S and noise are de-embedded to the package
Note 2: Guaranteed by design and characterization. This parameter is not tested.
pins, while large-signal parameters are measured directly from the circuit.
643115f
5
LTC6431-15
Typical perForMance characTerisTics TA = 25°C, VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless
otherwise noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
Stability Factor K vs Frequency
Over Temperature
Noise Figure vs Frequency
Over Temperature
S Parameters vs Frequency
25
20
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
T
=
CASE
T
=
CASE
100°C
–40°C
25°C
85°C
85°C
60°C
35°C
25°C
0°C
15
S11
S21
S12
S22
10
5
0
–20°C
–40°C
–5
–10
–15
–20
–25
–30
0
500 1000 1500 2000 2500 3000
800
FREQUENCY (MHz)
0
400 600
1000 1200
1400
0
1000
3000
2000
FREQUENCY (MHz)
4000
5000
200
FREQUENCY (MHz)
643115 G01
643115 G02
643115 G03
S11 vs Frequency Over Temperature
S21 vs Frequency Over Temperature
0
–5
20
18
16
14
12
10
8
T
=
CASE
100°C
85°C
60°C
35°C
25°C
0°C
–10
–15
–20
–25
T
=
CASE
–20°C
–40°C
100°C
85°C
60°C
35°C
25°C
0°C
6
4
2
–20°C
–40°C
0
0
1000 1500 2000 2500 3000
FREQUENCY (MHz)
500
0
500
1500 2000 2500 3000
FREQUENCY (MHz)
1000
643115 G04
643115 G05
S12 vs Frequency Over Temperature
S22 vs Frequency Over Temperature
0
0
–5
T
CASE
=
T
=
CASE
100°C
85°C
60°C
35°C
25°C
0°C
100°C
–5
–10
–15
–20
–25
–30
85°C
60°C
35°C
25°C
0°C
–10
–15
–20
–25
–30
–20°C
–40°C
–20°C
–40°C
0
1000 1500 2000 2500 3000
FREQUENCY (MHz)
0
1000 1500 2000 2500 3000
FREQUENCY (MHz)
500
500
643115 G07
643115 G06
643115f
6
LTC6431-15
Typical perForMance characTerisTics A-Grade
TA = 25°C, VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless otherwise noted. Measurements are performed using Test Circuit A, measuring
from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
OIP3 vs Frequency Over
VCC Voltage
OIP3 vs Frequency
OIP3 vs Power Out Over Frequency
50
48
52
50
48
46
44
42
40
38
36
34
32
30
50
48
46
44
42
40
38
36
34
T = 25°C
V
P
f
= 5V
CC
P
f
IN
= 2dBm/TONE
= 2dBm/TONE
= 1MHz
OUT
OUT
SPACE
= Z
OUT
SPACE
= Z
= 1MHz
OUT
Z
= 50Ω
Z
= 50Ω
IN
46
44
42
40
38
4.5V
4.75V
5V
5.25V
5.5V
V
P
= 5V, T = 25°C
CC
= 2dBm/TONE
OUT
f
= 1MHz
OUT
SPACE
Z
IN
= Z
= 50Ω
36
400
600
800
1000
200 300 400 500 600
1000
0
200
–2
8
10
0
100
700 800 900
–10
–6 –4
0
2
4
6
–8
RF POWER OUT (dBm/TONE)
FREQUENCY (MHz)
FREQUENCY (MHz)
643115 G10
643115 G08
643115 G09
50MHz
300MHz
400MHz
500MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
100MHz
200MHz
240MHz
OIP3 vs Tone Spacing
Over Frequency
OIP3 vs Frequency Over
Case Temperature
50
48
50
45
40
35
30
25
20
V
P
Z
= 5V, T = 25°C
CC
OUT
IN
= 2dBm/TONE
= Z
= 50Ω
OUT
46
44
42
40
38
85°C
60°C
25°C
V
P
= 5V
OUT
0°C
CC
= 2dBm/TONE
–20°C
–30°C
–40°C
f
= 1MHz
OUT
SPACE
Z
IN
= Z
= 50Ω
36
4
6
8
10 12
20
200 300 400 500 600
1000
0
2
14 16 18
0
100
700 800 900
TONE SPACING (MHz)
FREQUENCY (MHz)
643115 G12
643115 G11
50MHz
100MHz
200MHz
240MHz
300MHz
400MHz
500MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
643115f
7
LTC6431-15
Typical perForMance characTerisTics TA = 25°C, VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless
otherwise noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4).
HD2 vs Frequency Over POUT
HD3 vs Frequency Over POUT
HD4 vs Frequency Over POUT
0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
P
=
P
=
P
=
OUT
OUT
OUT
6dBm
6dBm
6dBm
–10
8dBm
10dBm
8dBm
10dBm
8dBm
10dBm
–20
–30
–40
–50
–60
–70
200 300 400 500 600
1000
200 300 400 500 600
1000
200 300 400 500 600 1000
700 800 900
0
100
700 800 900
0
100
700 800 900
0
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
643115 G13
643115 G14
643115 G15
Total Current (ITOT
)
Total Current (ITOT) vs VCC
vs Case Temperature
Total Current vs RF Input Power
100
98
96
94
92
90
88
86
84
82
95
90
85
80
75
70
65
60
55
50
100
90
80
70
60
50
V
= 5V
CC
T = 25°C
T
= 25°C
CASE
V
= 5V
CC
–10 –5
0
5
10
15
20
5.25 5.5
6
–15
4
4.25 4.5 4.75
5
5.75
80 100
–20
0
20
40
60
–40
TEMPERATURE (°C)
RF INPUT POWER (dBm)
V
(V)
CC
643115 G21
643115 G16
643115 G17
Output Power vs Input Power
Over Frequency
Gain vs Output Power
Over Frequency
P1dB vs Frequency
22
21
20
19
18
17
16
22
20
18
16
14
12
10
8
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
60MHz
100MHz
140MHz
200MHz
240MHz
300MHz
400MHz
500MHz
60MHz
100MHz
140MHz
200MHz
240MHz
300MHz
400MHz
500MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
6
4
2
0
200 300 400 500 600 1000
700 800 900
0
100
–10
–6 –4 –2
0
2
4
6
8
10
–8
0
5
10
15
20
FREQUENCY (MHz)
INPUT POWER (dBm)
OUTPUT POWER (dBm)
643115 G21
643115 G19
643115 G20
643115f
8
LTC6431-15
pin FuncTions
GND (Pins 8, 17, 23, Exposed Pad Pin 25): Ground. For
bestRFperformance,allgroundpinsshouldbeconnected
totheprintedcircuitboardgroundplane. Theexposedpad
should have multiple via holes to an underlying ground
plane for low inductance and good thermal dissipation.
OUT (Pin 18): Amplifier Output Pin. A choke inductor is
necessary to provide power from the 5V supply and to
provide RF isolation. For best performance select a choke
with low loss and high self-resonant frequency (SRF). A
DC blocking capacitor is also required. See the Applica-
tions Information section for specific recommendations.
IN (Pin 24): Signal Input Pin. This pin has an internally
generated2VDCbias. ADCblockingcapacitorisrequired.
See the Applications Information section for specific
recommendations.
DNC (Pins 1 to 7, 10 to 15, 19 to 21): Do Not Connect.
Do not connect these pins; allow them to float. Failure to
floatthesepinsmayimpairoperationoftheLTC6431-15.
V
(Pins 9, 22): Positive Power Supply. Either V pin
T_DIODE (Pin 16): Optional Diode. The T_DIODE can be
forward-biased to ground with 1mA of current. The meas-
ured voltage will be an indicator of chip temperature.
CC
CC
should be connected to the 5V supply. Bypass the V pin
CC
with 1000pF and 0.1µF capacitors. The 1000pF capacitor
should be physically close to Pin 22.
block DiagraM
V
CC
9, 22
BIAS AND TEMPERATURE
COMPENSATION
IN
15dB
GAIN
OUT
24
18
16
T_DIODE
GND
8, 17, 23, 25 (EXPOSED PAD)
643115 BD
643115f
9
LTC6431-15
TesT circuiT a
C1
60pF
C5
1nF
C6
0.1µF
C7
1000pF
PORT
INPUT
V
= 5V
CC
L1
560nH
C3
1000pF
R1
350Ω
DNC
DNC
DNC
DNC
DNC
DNC
OUT
GND
PORT
OUTPUT
OPTIONAL
STABILITY
NETWORK
T_DIODE
DNC
LTC6431-15
DNC
DNC
643115 F01
Figure 1. Application, Test Circuit A
operaTion
The LTC6431-15 is a highly linear, fixed-gain amplifier that
is configured to operate single ended. Its core signal path
consists of a single amplifier stage minimizing stability is-
sues.TheinputisaDarlingtonpairforhighinputimpedance
and high current gain. Additional circuit enhancements
increase the output impedance and minimize the effects
of internal Miller capacitance.
cally improved linearity. Shunt and series feedback are
addedtolowertheinput/outputimpedanceandmatchthem
simultaneously to the 50Ω source and load. Meanwhile,
an internal bias controller optimizes the internal operating
point for peak linearity over environmental changes. This
circuitarchitectureprovideslownoise,excellentRFpower
handling capability and wide bandwidth—characteristics
that are desirable for IF signal chain applications.
The LTC6431-15 starts with a classic RF gain-block topol-
ogybutaddsadditionalenhancementstoachievedramati-
643115f
10
LTC6431-15
applicaTions inForMaTion
The LTC6431-15 is a highly linear fixed-gain amplifier
which is designed for ease of use. Implementing an RF
gain stage is often a multistep project. Typically an RF
designer must choose a bias point and design a bias
network. Next the designer needs to address impedance
matching with input and output matching networks and,
finally, add stability networks to ensure stable operation
in and out of band. These tasks are handled internally
within the LTC6431-15.
Table 1. Target Frequency Bands and Suggested Inductor Values
FREQUENCY BAND INDUCTOR VALUE
MODEL
(MHz)
(nH)
1500nH
560nH
100nH
51nH
NUMBER
MANUFACTURER
20 to 100
100 to 500
500 to 1000
1000 to 2000
0805LS
0603LS
0603LS
0603LS
Coilcraft
www.coilcraft.com
DC Blocking Capacitor
The LTC6431-15 has an internal self-biasing network
which compensates for temperature variation and keeps
the device biased for optimal linearity. Therefore, input
and output DC blocking capacitors are required.
The role of a DC blocking capacitor is straightforward:
block the path of DC current and allow a low series imped-
ance path for the AC signal. Lower frequencies require a
highervalueofDCblockingcapacitance.Generally,1000pF
to 10000pF will suffice for operation down to 20MHz.
The LTC6431-15 is relatively insensitive to the choice of
blocking capacitor.
Boththeinputandoutputareinternallyimpedancematched
to50Ωfrom20MHzto1700MHz. Similarly, anRFchokeis
required at the output to deliver DC current to the device.
The RF choke acts as a high impedance (isolation) to
the DC supply which is at RF ground. Thus, the internal
LTC6431-15 impedance matching is unaffected by the
biasing network. The open collector output topology can
delivermuchmorepowerthananamplifierwhosecollector
is biased through a resistor or active load.
RF Bypass Capacitor
RF bypass capacitors act to shunt AC signals to ground
withalowimpedancepath. Itisbesttoplacethemasclose
as possible to the DC power supply pins of the device.
Any extra distance translates into additional series in-
ductance which lowers the self-resonant frequency and
useful bandwidth of the bypass capacitor. The suggested
bypass capacitor network consists of two capacitors:
a low value 1000pF capacitor to handle high frequencies
in parallel with a larger 0.1µF capacitor to handle lower
frequencies. Use ceramic capacitors of an appropriate
physical size for each capacitance value (e.g., 0402 for
the 1000pF, 0805 for the 0.1µF) to minimize the equiva-
lent series resistance (ESR) of the capacitor.
Choosing the Right RF Choke
Not all choke inductors are created equal. It is always
important to select an inductor with low R
, as this will
LOSS
drop the available voltage to the device. Also look for an
inductor with high self-resonant frequency (SRF) as this
will limit the upper frequency where the choke is useful.
Above the SRF, the parasitic capacitance dominates and
the choke impedance will drop. For these reasons, wire
wound inductors are preferred, and multilayer ceramic
chip inductors should be avoided for an RF choke. Since
the LTC6431-15 is capable of such wideband operation,
a single choke value will probably not result in optimized
performance across its full frequency band. Table 1 lists
target frequency bands and suggested corresponding
inductor values.
643115f
11
LTC6431-15
applicaTions inForMaTion
Low Frequency Stability
supply should also be applied to both of the V pins on
CC
the device. A suggested parallel 60pF, 350Ω network has
been added to the input to ensure low frequency stability.
The 60pF capacitance can be increased to improve low
frequency(<150MHz)performance.However,thedesigner
needs to be sure that the impedance presented at low
frequency will not create instability.
Most RF gain blocks suffer from low frequency instability.
Toavoidanystabilityissues,theLTC6431-15hasaninternal
feedback network that lowers the gain and matches the
inputandoutputimpedancesatfrequenciesabove20MHz.
This feedback network contains a series capacitor, so if at
some low frequency the feedback fails, the gain increases
andgrossimpedancemismatchesoccur—indeedarecipe
for instability. Luckily, this situation is easily resolved with
a parallel capacitor and resistor network on the input, as
seen in Figure 1. This network provides resistive loss at
low frequencies and is bypassed by the parallel capaci-
tor within the desired band of operation. However, if the
LTC6431-15 is preceeded by a low frequency termination,
suchasachoke,theinputstabilitynetworkisNOTrequired.
Please note that a number of DNC pins are connected on
the demo board. These connections are not necessary for
normal circuit operation.
Exposed Pad and Ground Plane Considerations
As with any RF device, minimizing ground inductance is
critical. Care should be taken with board layouts using
these exposed pad packages. The maximum allowable
number of minimum diameter via holes should be placed
underneath the exposed pad and connect to as many
ground plane layers as possible. This will provide good
RF ground and low thermal impedance. Maximizing the
copper ground plane will also improve heat spreading and
lower inductance. It is a good idea to cover the via holes
with a solder mask on the backside of the PCB to prevent
the solder from wicking away from the critical PCB to the
exposed pad interface.
Test Circuit
The test circuit shown in Figure 2 is designed to allow
evaluation of the LTC6431-15 with standard single-ended
50Ω test equipment. The circuit requires a minimum of
externalcomponents.SincetheLTC6431-15isawideband
part, the evaluation test circuit is optimized for wideband
operation. Obviously, for narrowband applications the
circuit can be further optimized. As mentioned earlier,
input and output DC blocking capacitors are required as
this device is internally biased for optimal operation. A
frequency appropriate choke and decoupling capacitors
are required to provide DC bias to the RF out node. A 5V
The LTC6431-15 is a wide bandwidth part, but it is not
intended for operation down to DC. The lower frequency
cutoff (20MHz) is limited by on-chip matching elements.
643115f
12
LTC6431-15
applicaTions inForMaTion
5
4
3
2
1
REVISION HISTORY
ECO REV
DESCRIPTION
APPROVED
DATE
__
OPTIONAL CIRCUIT
C10
2
PRODUCTION
JOHN C. 08-18-11
62pF
C11
C16
T1
SEE BOM
T2
1000pF
1000pF
J5
R5
SEE BOM
348
1
6
5
4
4
5
6
3
1
CAL IN
C19
1000pF
C18
1000pF
SMA-R
J18
D
C
B
A
D
C
B
A
C12
62pF
J6
3
C13
1000pF
C17
GND
CAL OUT
1000pF
R6
E6
SMA-R
348
GND
JP2
HD2X4-100
OPT
VCC
C7
C8
1000pF
VCC
62pF
J7
C1
1000pF
R2
+IN
348
L11
L1
C22
C21
1000pF
SMA-R
OPT
560nH 0.1uF
1008
JP1
HD2X6-100
OPT
U1
C3
J10
*
*
1000pF
1
18
17
16
15
14
13
+OUT
1
3
5
7
9
2
4
DNC
DNC
DNC
DNC
DNC
DNC
+OUT
GND
2
3
4
5
6
SMA-R
6
T_DIODE
DNC
8
10
GND
11 12
DNC
VCC
J11
E3
+5V
+5V
VCC
C20
JP3
HD2X4-100
OPT
1000pF
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE 0402.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
www.linear.com
*
TECHNOLOGY
PCB DES.
APP ENG.
KIM T.
ASSY
-C
U1
FREQ.
100-1200 MHz
T3, T4
OPT
R3, R4 R13,R14,R17,R18
OPT 0 OHM
J8
OPT
J10
STUFF
TITLE: SCHEMATIC
JOHN C.
LTC6431IUF-15
IF AMP/ADC DRIVER
SIZE
IC NO.
REV.
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
LTC643XIUF FAMILY
DEMO CIRCUIT 1774A
N/A
DATE:
1
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
Monday, June 25, 2012
SHEET
1
OF
1
5
4
3
2
1
Figure 2. DC1774A-C Demo Board Schematic
643115 F03
Figure 3. Demo Board
643115f
13
LTC6431-15
s paraMeTers 5V, 90mA, Z = 50Ω, T = 25°C, De-Embedded to Package Pins
FREQUENCY
(MHz)
S11
S11
S21
S21
S12
S12
S22
S22
(Ph)
GTU
(Max)
Stability
(K)
(Mag)
(Ph)
(Mag)
(Ph)
(Mag)
(Ph)
(Mag)
23.5
83.5
143
–14.90
–21.83
–22.33
–22.14
–21.88
–21.02
–20.39
–19.55
–18.88
–18.39
–18.02
–17.70
–17.37
–17.06
–16.73
–16.35
–16.05
–15.76
–15.51
–15.29
–15.13
–14.93
–14.75
–14.52
–14.26
–13.88
–13.48
–13.07
–12.67
–12.21
–11.77
–11.38
–10.95
–10.57
–10.19
–9.78
–93.74
–128.88
–142.38
–153.70
–162.35
–168.55
–172.14
–175.07
–177.54
179.31
175.72
171.89
168.02
164.02
160.39
156.50
152.86
149.53
146.42
143.29
141.27
138.82
137.08
135.84
134.03
132.68
130.52
128.54
126.19
123.77
120.88
117.51
114.44
110.59
106.94
103.11
99.15
15.94
15.54
15.54
15.54
15.52
15.49
15.42
15.41
15.37
15.35
15.32
15.29
15.26
15.20
15.17
15.12
15.07
15.02
14.98
14.90
14.87
14.80
14.72
14.67
14.55
14.43
14.27
14.06
13.82
13.60
13.31
13.02
12.83
12.51
12.46
12.20
12.20
12.10
12.07
166.13
169.51
166.10
161.63
156.90
152.16
147.41
142.91
138.07
133.30
128.48
123.64
118.80
113.94
109.07
104.20
99.34
94.39
89.31
84.36
79.21
74.05
69.04
63.48
58.17
52.80
47.38
42.05
37.06
32.36
27.42
23.82
19.28
15.92
12.13
7.92
–19.01
–18.92
–18.98
–19.04
–19.10
–19.15
–19.23
–19.29
–19.37
–19.44
–19.53
–19.61
–19.71
–19.82
–19.92
–20.04
–20.16
–20.29
–20.42
–20.55
–20.70
–20.84
–21.01
–21.14
–21.34
–21.47
–21.63
–21.83
–22.01
–22.30
–22.49
–22.74
–23.04
–23.17
–23.59
–23.73
–23.99
–24.32
–24.53
8.83
–15.39
–26.58
–31.71
–36.22
–36.75
–35.10
–31.62
–29.46
–26.62
–25.06
–23.84
–22.46
–21.37
–20.17
–19.13
–18.11
–17.31
–16.51
–15.82
–15.22
–14.56
–13.94
–13.37
–12.79
–12.27
–11.71
–11.24
–10.62
–10.07
–9.51
–77.56
–72.76
–52.44
–29.74
–13.45
–3.73
16.21
15.58
15.57
15.57
15.55
15.52
15.46
15.46
15.44
15.43
15.41
15.39
15.37
15.33
15.31
15.29
15.26
15.24
15.22
15.16
15.16
15.12
15.07
15.06
14.98
14.91
14.80
14.67
14.51
14.39
14.19
13.98
13.89
13.66
13.71
13.53
13.62
13.60
13.66
0.99
1.07
1.07
1.08
1.08
1.08
1.09
1.09
1.09
1.09
1.10
1.10
1.10
1.11
1.11
1.11
1.12
1.12
1.13
1.13
1.14
1.14
1.15
1.16
1.17
1.18
1.19
1.20
1.22
1.24
1.26
1.29
1.31
1.34
1.36
1.38
1.39
1.41
1.41
–3.42
–8.97
203
–13.69
–18.05
–22.46
–26.61
–30.83
–34.91
–39.04
–43.16
–47.19
–51.39
–55.31
–59.53
–63.43
–67.53
–71.52
–75.48
–79.56
–83.45
–87.50
–91.46
–95.38
–99.38
–103.25
–107.46
–111.37
–115.95
–119.76
–123.59
–127.66
–131.54
–134.66
–139.47
–141.66
–146.81
–149.09
–152.92
263
323
383
0.84
443
–1.01
503
–2.90
563
–7.32
623
–14.68
–23.42
–30.32
–37.91
–44.68
–50.82
–57.37
–63.98
–70.79
–78.18
–85.99
–93.89
–101.73
–109.91
–117.55
–125.53
–134.17
–142.12
–150.09
–158.23
–165.81
–172.96
179.92
172.64
166.43
159.51
153.38
146.92
140.33
683
743
803
863
923
983
1049
1109
1160
1220
1280
1340
1400
1460
1520
1580
1640
1700
1760
1820
1880
1940
2000
2060
2120
2180
2240
2300
–9.02
–8.65
–8.28
–7.97
–7.71
–7.49
–9.44
4.71
–7.32
–9.02
95.22
–0.60
–5.36
–7.17
–8.67
91.22
–7.05
643115f
14
LTC6431-15
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
UF Package
24-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-ꢀ697 Rev B)
0.70 0.05
4.50 0.05
3.ꢀ0 0.05
2.45 0.05
(4 SIDES)
PACKAGE OUTLINE
0.25 0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
BOTTOM VIEW—EXPOSED PAD
PIN ꢀ NOTCH
R = 0.20 TYP OR
0.35 × 45° CHAMFER
R = 0.ꢀꢀ5
TYP
0.75 0.05
4.00 0.ꢀ0
(4 SIDES)
23 24
PIN ꢀ
TOP MARK
(NOTE 6)
0.40 0.ꢀ0
ꢀ
2
2.45 0.ꢀ0
(4-SIDES)
(UF24) QFN 0ꢀ05 REV B
0.200 REF
0.25 0.05
0.50 BSC
0.00 – 0.05
NOTE:
ꢀ. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
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.ꢀ5mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN ꢀ LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
643115f
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
LTC6431-15
Typical applicaTion
0.1µF
V
= 5V
CC
5V
18
R
9, 22
F
R
SOURCE
CHOKE,
1000pF
50Ω
C = 1000pF
C =1000pF
L = 560nH
LTC6431-15
24
R
LOAD
50Ω
8, 17, 23, 25
643115 TA02
relaTeD parTs
PART NUMBER
DESCRIPTION
COMMENTS
Fixed Gain IF Amplifiers/ADC Drivers
LTC6417
LTC6416
LTC6410-6
1.6GHz Low Noise High Linearity Differential Buffer/
ADC Driver
OIP3 = 41dBm at 300MHz; Can Drive 50Ω Differential Output;
High Speed Voltage Clamping Protects Subsequent Circuitry
2GHz, 16-Bit Differential ADC Buffer
–72dBc IM2 at 300MHz 2V Composite; I = 42mA;
P-P S
eN = 2.8nV/√Hz; A = 0dB; 300MHz
V
1.4GHz Differential IF Amplifier with Configurable
Input Impedance
OIP3 = 36dBm at 70MHz; Flexible Interface to Mixer IF Port
LTC6400-8/LTC6400-14/ 1.8GHz Low Noise, Low Distortion Differential
LTC6400-20/LTC6400-26 ADC Drivers
–71dBc IM3 at 240MHz 2V Composite; I = 90mA;
V
P-P
S
A = 8dB/14dB/20dB/26dB
LTC6420-20
Dual 1.8GHz Low Noise, Low Distortion Differential
ADC Drivers
Dual Version of the LTC6400-20; A = 20dB
V
LT1993-2/LT1993-4/
LT1993-10
800MHz Differential Amplifier/ADC Drivers
–72dBc IM3 at 70MHz 2V Composite; A = 2V/V, 4V/V, 10V/V
P-P V
Variable Gain IF Amplifiers/ADC Drivers
LTC6412
800MHz, 31dB Range Analog-Controlled VGA
OIP3 = 35dBm at 240MHz; Continuously Adjustable Gain Control
Baseband Differential Amplifiers
LT6411
Low Power Differential ADC Driver/Dual Selectable
Gain Amplifier
–83dBc IM3 at 70MHz 2V Composite; A = 1, –1 or 2;
P-P V
16mA; Excellent for Single-Ended to Differential Conversion
LTC6406
3GHz Rail-to-Rail Input Differential Amplifier/
ADC Driver
–65dBc IM3 at 50MHz 2V Composite; Rail-to-Rail Inputs;
P-P
eN = 1.6nV/√Hz; 18mA
LTC6404-1/LTC6404-2
Low Noise Rail-to-Rail Output Differential Amplifier/
ADC Driver
16-Bit SNR, SFDR at 10MHz; Rail-to-Rail Outputs;
eN = 1.5nV/√Hz; LTC6404-1 Is Unity-Gain Stable,
LTC6404-2 Is Gain-of-Two Stable
LTC6403-1
Low Noise Rail-to-Rail Output Differential
16-Bit SNR, SFDR at 3MHz; Rail-to-Rail Outputs; eN =
2.8nV/√Hz
LT1994
Low Noise, Low Distortion Differential Amplifier/ADC Driver
16-Bit SNR, SFDR at 1MHz; Rail-to-Rail Outputs
High Speed ADCs
LTC2208/LTC2209
16-Bit, 130Msps/160Msps ADCs
16-Bit, 80Msps, 1.8V ADC
78dBFS/77dBFS Noise Floor, 100dB SFDR, 2.25V or 1.5V
P-P
P-P
Input Range
LTC2259-16
89mW, 73.1dB SNR, 88dB SFDR, 1V to 2V Input Range
P-P P-P
LTC2160/LTC2161/
LTC2162/LTC2163/
LTC2164/LTC2165
16-Bit, 25Msps/40Msps/65Msps/80Msps/105Msps/
125Msps, 1.8V ADCs
77dB SNR, 90dB SFDR, 1V to 2V Input Range
P-P P-P
LTC2150-14/LTC2151-14/ 14-Bit, 170Msps/210Msps/250Msps/310Msps, 1.8V ADCs Single ADCs, >68dB SNR, >88dB SFDR, 1.32V Input Range
P-P
LTC2152-14/LTC2153-14
LTC2155-14/LTC2156-14/ 14-Bit, 170Msps/210Msps/250Msps/310Msps, 1.8V ADCs Dual ADCs, >68dB SNR, >88dB SFDR, 1.32V Input Range
P-P
LTC2157-14/LTC2158-14
643115f
LT 0712 • PRINTED IN USA
16 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2012
相关型号：
LTC2165CUK#PBF
LTC2165 - 16-Bit, 125Msps Low Power ADCs; Package: QFN; Pins: 48; Temperature Range: 0°C to 70°C
Linear
LTC2165IUK#PBF
LTC2165 - 16-Bit, 125Msps Low Power ADCs; Package: QFN; Pins: 48; Temperature Range: -40°C to 85°C
Linear
LTC2165IUK#TRPBF
LTC2165 - 16-Bit, 125Msps Low Power ADCs; Package: QFN; Pins: 48; Temperature Range: -40°C to 85°C
Linear
LTC2170CUKG-12#PBF
LTC2170-12 - 12-Bit, 25Msps Low Power Quad ADCs; Package: QFN; Pins: 52; Temperature Range: 0°C to 70°C
Linear
LTC2170CUKG-12#TRPBF
LTC2170-12 - 12-Bit, 25Msps Low Power Quad ADCs; Package: QFN; Pins: 52; Temperature Range: 0°C to 70°C
Linear
©2020 ICPDF网 联系我们和版权申明