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PDF LTC5548 Data sheet ( Hoja de datos )
| Número de pieza | LTC5548 | |
| Descripción | 2GHz to 14GHz Microwave Mixer | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
nn Upconversion or Downconversion
nn High IIP3: +24.4dBm at 5.8GHz
+21.4dBm at 9GHz
nn 7.1dB Conversion Loss at 5.8GHz
nn +15.2dBm Input P1dB at 5.8GHz
nn Integrated LO Buffer: 0dBm LO Drive
nn Selectable Integrated LO Frequency Doubler
nn Low LO-RF Leakage: <–30dBm
nn 50Ω Wideband Matched RF and LO Ports
nn 3.3V/120mA Supply
nn Fast Turn ON/OFF for TDD Operation
nn 3mm × 2mm, 12-Lead QFN Package
Applications
nn Microwave Transceivers
nn Wireless Backhaul
nn Point-to-Point Microwave
nn Phased-Array Antennas
nn C, X and Ku Band RADAR
nn Test Equipment
nn Satellite MODEMs
LTC5548
2GHz to 14GHz
Microwave Mixer with
Wideband DC– 6GHz IF
Description
The LTC®5548 is a high performance, microwave double
balanced passive mixer that can be used for frequency
upconversion or downconversion. The device is similar
to the LTC5549, but with a broadband, differential DC to
6GHz IF port. The LTC5548 is recommended for applica-
tions where the IF frequency range extends below 500MHz.
For applications where the IF frequency is always above
500MHz, the LTC5549 is recommended, since it includes
an integrated IF balun.
The LTC5548’s mixer and integrated RF balun are opti-
mized to cover the 2GHz to 14GHz RF frequency range.
The device includes an integrated LO amplifier optimized
for the 1GHz to 12GHz frequency range, requiring only
0dBm drive. The device also includes an integrated LO
frequency doubler, which can be enabled or disabled with
a CMOS-compatible control pin.
The LTC5548 delivers exceptionally high IIP3 and P1dB,
in addition to very low LO to RF and LO to IF leakages.
The part also offers high integration in a small package.
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
LNA
DUPLEXER
PA
LTC5548
RF IF
LO
RX
IFOUT
RX
LO
TX
LO
LO
RF IF
TX
IFIN
LTC5548
5548 TA01a
Conversion Loss and IIP3
(Low Side LO, IF = 240MHz)
30
28
26 IIP3
24
22
20
18 DOWNMIXING
16 UPMIXING
14
12
10 CONVERSION LOSS
8
6
2 3 4 5 6 7 8 9 10 11 12
RF FREQUENCY (GHz)
5548 TA01b
For more information www.linear.com/LTC5548
5548f
1
1 page  
LTC5548
Typical Performance Characteristics EN = high, test circuit shown in Figure 1.
Supply Current vs Case
Temperature
150
X2 = HIGH
140
130
120
110 X2 = LOW
100
90
VCC = 3V
80 VCC = 3.3V
VCC = 3.6V
70
–40 –20 0 20 40 60 80 100 120
CASE TEMPERATURE (°C)
5548 G01
Supply Current vs VCC
150
140 X2 = HIGH
130
120
X2 = LOW
110
100
90
80
70
3.0
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
3.1 3.2 3.3 3.4 3.5
SUPPLY VOLTAGE (V)
3.6
5548 G02
For more information www.linear.com/LTC5548
5548f
5
5 Page 
LTC5548
Pin Functions
GND (Pins 1, 4, 6, 10, 12, Exposed Pad Pin 13): Ground.
These pins must be soldered to the RF ground on the circuit
board. The exposed pad metal of the package provides
both electrical contact to ground and good thermal contact
to the printed circuit board.
IF+, IF– (Pins 2, 3): Differential Terminals for the IF. These
pins may be used for a differential IF or connected to an
external balun if a single-ended IF port is needed. The IF
port can be used from DC up to 6GHz depending on the
external balun bandwidth.
RF (Pin 5): Single-Ended Terminal for the RF Port. This
pin is internally connected to the primary side of the RF
transformer, which has low DC resistance to ground. A
series DC blocking capacitor must be used to avoid damage
to the integrated transformer if DC voltage is present. The
RF port is impedance matched from 2GHz to 14GHz as
long as the LO is driven with a 0 ±6dBm source between
1GHz and 12GHz.
EN (Pin 7): Enable Pin. When the voltage applied to this
pin is greater than 1.2V, the mixer is enabled. When the
voltage is less than 0.3V, the mixer is disabled. Typical
input current is less than 30μA. This pin has an internal
376kΩ pull-down resistor.
X2 (Pin 8): Digital Control Pin for LO Frequency Doubler.
When the voltage applied to this pin is greater than 1.2V,
the LO frequency doubler is enabled. When the voltage DC
is less than 0.3V, the LO frequency doubler is disabled.
Typical input current is less than 30μA. This pin has an
internal 376kΩ pull-down resistor.
VCC (Pin 9): Power Supply Pin. This pin must be externally
connected to a regulated 3.3V supply, with a bypass capaci-
tor located close to the pin. Typical current consumption
is 120mA when the part is enabled.
LO (Pin 11): Input for the Local Oscillator (LO). A series
DC blocking capacitor must be used. Typical DC voltage
at this pin is 1.6V.
Block Diagram
LTC5548
32
IF – IF+
X2
5
RF
LO
AMP
11
LO
MIXER
CORE
REF/BIAS
EN
7
GND PINS ARE NOT SHOWN.
X2
8
9 VCC
5548 BD
For more information www.linear.com/LTC5548
5548f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC5548.PDF ] | |
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