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PDF ADL5370 Data sheet ( Hoja de datos )
| Número de pieza | ADL5370 | |
| Descripción | Quadrature Modulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Output frequency range: 300 MHz to 1000 MHz
Modulation bandwidth: >500 MHz (3 dB)
1 dB output compression: 11 dBm @ 450 MHz
Noise floor: −160 dBm/Hz
Sideband suppression: −41 dBc @ 450 MHz
Carrier feedthrough: −50 dBm @ 450 MHz
Single supply: 4.75 V to 5.25 V
24-lead LFCSP_VQ package
APPLICATIONS
Cellular communication systems at 450 MHz
CDMA2000/GSM
WiMAX/broadband wireless access systems
Cable communication equipment
Satellite modems
GENERAL DESCRIPTION
The ADL5370 is the first in the fixed-gain quadrature modulator
(F-MOD) family designed for use from 300 MHz to 1000 MHz.
Its excellent phase accuracy and amplitude balance enable high
performance intermediate frequency or direct radio frequency
modulation for communication systems.
The ADL5370 provides a greater than 500 MHz, 3 dB baseband
bandwidth, making it ideally suited for use in broadband zero
IF or low IF-to-RF applications and in broadband digital
predistortion transmitters.
300 MHz to 1000 MHz
Quadrature Modulator
ADL5370
FUNCTIONAL BLOCK DIAGRAM
IBBP
IBBN
LOIP
LOIN
QUADRATURE
PHASE
SPLITTER
VOUT
QBBN
QBBP
Figure 1.
The ADL5370 accepts two differential baseband inputs and
a single-ended LO and generates a single-ended 50 Ω output.
The ADL5370 is fabricated using the Analog Devices, Inc.
advanced silicon-germanium bipolar process. It is available in
a 24-lead, exposed-paddle, Pb-free, LFCSP_VQ package. Perform-
ance is specified over a −40°C to +85°C temperature range.
A Pb-free evaluation board is available.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADL5370
COM1 1
COM1 2
VPS1 3
VPS1 4
VPS1 5
VPS1 6
ADL5370
TOP VIEW
(Not to Scale)
18 VPS5
17 VPS4
16 VPS3
15 VPS2
14 VPS2
13 VOUT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1, 2, 7, 10 to 12, COM1, COM2,
21, 22
COM3, COM4
3 to 6, 14 to 18 VPS1, VPS2, VPS3,
VPS4, VPS5
19, 20, 23, 24
IBBP, IBBN, QBBN,
QBBP
8, 9 LOIP, LOIN
13 VOUT
Exposed Paddle
Description
Input Common Pins. Connect to ground plane via a low impedance path.
Positive Supply Voltage Pins. All pins should be connected to the same supply (VS). To ensure
adequate external bypassing, connect 0.1 μF capacitors between each pin and ground. Adjacent
power supply pins of the same name can share one capacitor (see Figure 25).
Differential In-Phase and Quadrature Baseband Inputs. These high impedance inputs must be
dc-biased to 500 mV dc, and must be driven from a low impedance source. Nominal characterized
ac signal swing is 700 mV p-p on each pin. This results in a differential drive of 1.4 V p-p with a
500 mV dc bias. These inputs are not self-biased and must be externally biased.
50 Ω Single-Ended Local Oscillator Input. Internally dc-biased. Pins must be ac-coupled. AC-couple
LOIN to ground and drive LO through LOIP.
Device Output. Single-ended, 50 Ω internally biased RF output. Pin must be ac-coupled to the load.
Connect to ground plane via a low impedance path.
Rev. 0 | Page 5 of 20
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BASIC CONNECTIONS
Figure 25 shows the basic connections for the ADL5370.
QBBP
QBBN IBBN
IBBP
COM1 1
COM1 2
VPS1 3
VPS1 4
VPS1 5
VPS1 6
C12
0.1µF
Z1
ADL5370
EXPOSED PADDLE
C16
0.1µF
C15
0.1µF
18 VPS5
17 VPS4
16 VPS3
15 VPS2
14 VPS2
C14
0.1µF
VPOS
13
VOUT
C13
0.1µF
COUT
100pF
C11
OPEN
VOUT
GND
CLOP
100pF
LO
CLON
100pF
Figure 25. Basic Connections for the ADL5370
Power Supply and Grounding
All the VPS pins must be connected to the same 5 V source.
Adjacent pins of the same name can be tied together and decoupled
with a 0.1 μF capacitor. These capacitors should be located as
close as possible to the device. The power supply can range
between 4.75 V and 5.25 V.
The COM1 pin, COM2 pin, COM3 pin, and COM4 pin should
be tied to the same ground plane through low impedance paths.
The exposed paddle on the underside of the package should also
be soldered to a low thermal and electrical impedance ground
plane. If the ground plane spans multiple layers on the circuit
board, they should be stitched together with nine vias under the
exposed paddle. The Analog Devices AN-772 application note
discusses the thermal and electrical grounding of the
LFCSP_VQ in greater detail.
ADL5370
Baseband Inputs
The baseband inputs QBBP, QBBN, IBBP, and IBBN must be
driven from a differential source. The nominal drive level of
1.4 V p-p differential (700 mV p-p on each pin) should be
biased to a common-mode level of 500 mV dc.
The dc common-mode bias level for the baseband inputs may
range from 400 mV to 600 mV. This results in a reduction in
the usable input ac swing range. The nominal dc bias of 500 mV
allows for the largest ac swing, limited on the bottom end by the
ADL5370 input range and on the top end by the output compliance
range on most digital-to-analog converters (DAC) from Analog
Devices.
LO Input
A single-ended LO signal should be applied to the LOIP pin
through an ac-coupling capacitor. The recommended LO drive
power is 0 dBm. The LO return pin, LOIN, should be ac-coupled
to ground through a low impedance path.
The nominal LO drive of 0 dBm can be increased to up to 7 dBm
to realize an improvement in the noise performance of the
modulator. This improvement is tempered by degradation in
the sideband suppression performance (see Figure 20) and,
therefore, should be used judiciously. If the LO source cannot
provide the 0 dBm level, then operation at a reduced power
below 0 dBm is acceptable. Reduced LO drive results in slightly
increased modulator noise. The effect of LO power on sideband
suppression and carrier feedthrough is shown in Figure 20. The
effect of LO power on GSM noise is shown in Figure 35.
RF Output
The RF output is available at the VOUT pin (Pin 13). This pin
must also be ac-coupled. The VOUT pin has a nominal
broadband impedance of 50 Ω and does not need further
external matching.
Rev. 0 | Page 11 of 20
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADL5370.PDF ] | |
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