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PDF LTC6430-20 Data sheet ( Hoja de datos )
| Número de pieza | LTC6430-20 | |
| Descripción | High Linearity Differential RF/IF Amplifier/ADC Driver | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
n 51.0dBm OIP3 at 240MHz into a 100Ω Diff Load
n NF = 2.9dB at 240MHz
n 20MHz to 2060MHz –3dB Bandwidth
n 20.8dB Gain
n A-Grade 100% OIP3 Tested at 380MHz
n 0.6nV/√Hz Total Input Noise
n S11 < –10dB Up to 1.4GHz
n S22 < –10dB Up to 1.4GHz
n >2.75VP-P Linear Output Swing
n P1dB = 24.0dBm
n Insensitive to VCC Variation
n 100Ω Differential Gain-Block Operation
n Input/Output Internally Matched to 100Ω Diff
n Single 5V Supply
n DC Power = 850mW
n 4mm × 4mm, 24-Lead QFN Package
APPLICATIONS
n Differential ADC Driver
n Differential IF Amplifier
n OFDM Signal Chain Amplifier
n 50Ω Balanced IF Amplifier
n 75Ω CATV Amplifier
n 700MHz to 800MHz LTE Amplifier
n Low Phase Noise Clock or LO Amplifier
LTC6430-20
High Linearity Differential
RF/IF Amplifier/ADC Driver
DESCRIPTION
The LTC®6430-20 is a differential gain block amplifier
designed to drive high resolution, high speed ADCs with
excellent linearity beyond 1000MHz and with low associ-
ated output noise. The LTC6430-20 operates from a single
5V power supply and consumes only 850mW.
In its differential configuration,the LTC6430-20 can directly
drive the differential inputs of an ADC. Using 1:2 baluns,
the device makes an excellent 50Ω wideband balanced
amplifier. While using 1:1.33 baluns, the device creates
a high fidelity 40MHz to 1000MHz 75Ω CATV amplifier.
The LTC6430-20 is designed for ease of use, requiring a
minimum of support components. The device is internally
matched to 100Ω differential source/load impedance. On-
chip bias and temperature compensation ensure consistent
performance over environmental changes.
The LTC6430-20 uses a high performance SiGe BiCMOS
process for excellent repeatability compared with similar
GaAs amplifiers. All A-grade LTC6430-20 devices are tested
and guaranteed for OIP3 at 380MHz. The LTC6430-20 is
housed in a 4mm × 4mm, 24-lead, QFN package with an
exposed pad for thermal management and low inductance.
A single-ended 50Ω IF gain block with similar performance
is also available, see the related LTC6431-20.
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.
TYPICAL APPLICATION
Differential 16-Bit ADC Driver
5V
OIP3 vs Frequency
55
VCM
50
1:2
BALUN
VCC = 5V
RF
CHOKES
50Ω LTC6430-20
RSOURCE = 100Ω
DIFFERENTIAL
RLOAD = 100Ω
DIFFERENTIAL
FILTER
ADC
643020 TA01a
For more information www.linear.com/LTC6430-20
45
40
35
VCC = 5V
POUT = 3dBm/ TONE
ZIN = ZOUT = 100Ω DIFF.
30 TA = 25°C
0 200 400 600
FREQUENCY (MHz)
800 1000
643020 TA01b
643020f
1
1 page  
LTC6430-20
A C ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise
Measurements are performed
usspiencgifTiceasttioCnirscuairteAa,tmTAea=s2u5ri°nCg,
fVroCCm=550VΩ,
SZSMOAURtoCE5=0ΩZLOSAMDA=w1i0th0oΩu,t
unless otherwise noted (Note
de-embedding (Note 4).
3).
SYMBOL PARAMETER
OIP3 Output Third-Order Intercept Point
IM3 Third-Order Intermodulation
HD2 Second Harmonic Distortion
HD3 Third Harmonic Distortion
P1dB Output 1dB Compression Point
NF Noise Figure
Frequency = 800MHz
S21 Differential Power Gain
OIP3 Output Third-Order Intercept Point
IM3 Third-Order Intermodulation
HD2 Second Harmonic Distortion
HD3 Third Harmonic Distortion
P1dB Output 1dB Compression Point
NF Noise Figure
Frequency = 900MHz
S21 Differential Power Gain
OIP3 Output Third-Order Intercept Point
IM3 Third-Order Intermodulation
HD2 Second Harmonic Distortion
HD3 Third Harmonic Distortion
P1dB Output 1dB Compression Point
NF Noise Figure
Frequency = 1000MHz
S21 Differential Power Gain
OIP3 Output Third-Order Intercept Point
IM3 Third-Order Intermodulation
HD2
HD3
P1dB
NF
Second Harmonic Distortion
Third Harmonic Distortion
Output 1dB Compression Point
Noise Figure
CONDITIONS
P OU T = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
P OU T = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 8dBm
POUT = 8dBm
A-Grade
B-Grade
A-Grade
B-Grade
De-Embedded to Package for Balun Input Loss
De-Embedded to Package
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 8dBm
POUT = 8dBm
A-Grade
B-Grade
A-Grade
B-Grade
De-Embedded to Package for Balun Input Loss
De-Embedded to Package
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 8dBm
POUT = 8dBm
A-Grade
B-Grade
A-Grade
B-Grade
De-Embedded to Package for Balun Input Loss
De-Embedded to Package
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 2dBm/Tone, Δf = 1MHz, ZO = 100Ω
POUT = 8dBm
POUT = 8dBm
A-Grade
B-Grade
A-Grade
B-Grade
De-Embedded to Package for Balun Input Loss
MIN TYP MAX
48.6
45.6
–93.2
–87.2
–58.0
–74.5
23.6
3.68
UNITS
dBm
dBm
dBc
dBc
dBc
dBc
dBm
dB
20.7
46.5
43.5
–89.0
–83.0
–51.4
–71.2
22.9
3.93
dB
dBm
dBm
dBc
dBc
dBc
dBc
dBm
dB
20.7
45.1
43.1
–86.2
–82.2
–48.9
–68.4
22.3
4.0
dB
dBm
dBm
dBc
dBc
dBc
dBc
dBm
dB
20.6
43.7
41.7
–83.4
–79.4
–55.2
–65.8
22.5
4.27
dB
dBm
dBm
dBc
dBc
dBc
dBc
dBm
dB
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: Guaranteed by design and characterization. This parameter is not tested.
Note 3: The LTC6430-20 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 pins, while large signal parameters are measured directly from the
test circuit.
643020f
For more information www.linear.com/LTC6430-20
5
5 Page 
LTC6430-20
APPLICATIONS INFORMATION
The LTC6430-20 is a highly linear fixed-gain amplifier
which is designed for ease of use. Both the input and
output are internally matched to 100Ω differential source
and load impedance from 20MHz to 1400MHz. Biasing and
temperature compensation are also handled internally to
deliver optimized performance. The designer need only
supply input/output blocking capacitors, RF chokes and
decoupling capacitors for the 5V supply. However, because
the device is capable of such wideband operation, a single
application circuit will probably not result in optimized
performance across the full frequency band.
will 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’s
impedance will drop. For these reasons, wire-wound induc-
tors are preferred, while multilayer ceramic chip inductors
should be avoided for an RF choke if possible. Since the
LTC6430-20 is capable of such wideband operation, a single
choke value will not result in optimized performance across
its full frequency band. Table 1 lists common frequency bands
and suggested corresponding inductor values.
Differential circuits minimize the common mode noise
and 2nd harmonic distortion issues that plague many
designs. Additionally, the LTC6430’s differential topol-
ogy matches well with the differential inputs of an ADC.
However, evaluation of these differential circuits is dif-
ficult, as high resolution, high frequency, differential test
equipment is lacking.
Our test circuit is designed for evaluation with standard
single ended 50Ω test equipment. Therefore, 1:2 balun
transformers have been added to the input and output to
transform the LTC6430-20’s 100Ω differential source/load
impedance to 50Ω single-ended impedance compatible
with most test equipment.
Other than the balun, the evaluation circuit requires a
minimum of external components. Input and output DC-
blocking capacitors are required as this device is internally
biased for optimal operation. A frequency appropriate
choke and de-coupling capacitors provide DC bias to the
RF ±OUT nodes. Only a single 5V supply is necessary to
either of the VCC pins on the device. Both VCC pins are
connected inside the package. Two VCC pins are provided
for the convenience of supply routing on the PCB. An op-
tional parallel 60pF, 350Ω input network has been added
to ensure low frequency stability.
The particular element values shown in Test Circuit A are
chosen for wide bandwidth operation. Depending on the
desired frequency, performance may be improved by
custom selection of these supporting components.
Choosing the Right RF Choke
Not all choke inductors are created equal. It is always im-
portant to select an inductor with low RLOSS as resistance
Table 1. Target Frequency and Suggested Inductor Value
FREQUENCY INDUCTOR
BAND
VALUE
(MHz)
(nH)
SRF
(MHz)
MODEL
NUMBER MANUFACTURER
20 to 100
100 to 500
1500
560
100 0603LS Coilcraft
525 0603LS www.coilcraft.com
500 t o 1000
100
1150 0603LS
1000 to 2000
51
1400 0603LS
DC-Blocking Capacitor
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
higher value of DC-blockingcapacitance.Generally, 1000pF
to 10,000pF will suffice for operation down to 20MHz.
The LTC6430-20 linearity is insensitive to the choice of
blocking capacitor.
RF Bypass Capacitor
RF bypass capacitors act to shunt the AC signals to
ground with a low impedance path. They prevent the AC
signal from getting into the DC bias supply. It is best to
place the bypass capacitor as close as possible to the DC
supply pins of the amplifier. Any extra distance translates
into additional series inductance which lowers the effec-
tiveness of the bypass capacitor network. The suggested
bypass capacitor network consists of two capacitors:
a low value 1000pF capacitor to shunt high frequencies
and a larger 0.1µF capacitor to handle lower frequencies.
Use ceramic capacitors of appropriate physical size for
each capacitance value (e.g., 0402 for the 1000pF, 0805
for the 0.1µF) to minimize the equivalent series resistance
(ESR) of the capacitor.
643020f
For more information www.linear.com/LTC6430-20
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC6430-20.PDF ] | |
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