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PDF ADL5592 Data sheet ( Hoja de datos )
| Número de pieza | ADL5592 | |
| Descripción | 250 MHz to 2400 MHz RF Variable Gain Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Output frequency range: 250 MHz to 2400 MHz
Noise figure: 5.7 dB at 1960 MHz
OIP3 at 1960 MHz: 29 dBm at PIN = 0 dBm per tone
2 digital attenuators, each with 31 dB range
1 dB attenuation step size
Single SPI port
Single supply: 4.5 V to 5.5 V
www.DataShee4t40U-l.ecaodm, 6 mm × 6 mm LFCSP package
APPLICATIONS
GSM/EDGE and cellular communications systems
GENERAL DESCRIPTION
The ADL5592 is a digitally programmable variable gain
amplifier (VGA) designed for use from 250 MHz to 2400 MHz.
Two digitally programmable attenuators are cascaded with a
high linearity fixed-gain amplifier. The device also includes a
mixer, which can be used to mix the transmitted signal into an
adjacent receive band for loopback testing.
The ADL5592 can be used in conjunction with a direct-to-RF
modulator, such as ADL537x and ADL539x, in cellular
communications systems such as GSM/EDGE.
The ADL5592 is available in a 6 mm × 6 mm, 40-lead exposed-
paddle LFCSP package. The device operates from the −40°C to
+85°C temperature range.
250 MHz to 2400 MHz
RF Variable Gain Amplifier
ADL5592
FUNCTIONAL BLOCK DIAGRAM
RFIN
RFOUT
LOIP
LOOP EN
ATTENUATOR
CONTROL
CIRCUITRY
ADL5592
LOOP OUT
SPI PORT*
*COMPRISES THE DATA, CLK, AND LE PINS.
Figure 1.
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
©2008 Analog Devices, Inc. All rights reserved.
1 page  
Parameter
Input Logic Low
Input Logic High
Switching Time
ISOLATION
LOOP OUT to RFOUT
RFIN to RFOUT
RFOUT to LOOP OUT
www.DataSheet4URF.cIoNmto LOOP OUT
POWER SUPPLIES
Voltage
Supply Current
Conditions
Loopback active
Loopback inactive
Enable/disable
Min
2.4
Loopback mode, at loop output frequency, maximum
attenuation set on ATTN 1 and ATTN 2. RFIN = 4 dBm,
RF loop output = −11 dBm
Loopback mode, at RF input frequency, maximum
attenuation set on ATTN 1 and ATTN 2. RFIN = 4 dBm,
RF loop output = −11 dBm
At carrier frequency, transmit mode, minimum
attenuation set on ATTN 1 and ATTN 2, POUT = 15 dBm
Transmit mode, maximum attenuation set on ATTN 1
and ATTN 2, PINATT1 = 4 dBm
VCC pins
Loopback active at TA = 25°C
TA = −40°C to +85°C
Loopback inactive at TA = 25°C
TA = −40°C to +85°C
4.5
ADL5592
Typ Max Unit
0 0.8 V
5V
500 ns
−68 dBm
−50 dBm
−50 dB
−50 dB
5.0 5.5 V
230 mA
255 mA
189 mA
208 mA
Rev. 0 | Page 5 of 20
5 Page 
THEORY OF OPERATION
Figure 16 shows a simplified schematic of the ADL5592.
RFIN
RFOUT
LOIP
LOOP EN
ATTENUATOR
CONTROL
CIRCUITRY
ADL5592
www.DataSheet4U.com
LOOP OUT
SPI PORT*
*COMPRISES THE DATA, CLK, AND LE PINS.
Figure 16. Simplified Schematic
INPUT SWITCH
The high performance single-pole, double throw (SPDT) GaAs
pHEMT switch is connected to the RF input pin of the ADL5592
to switch the input signal between the VGA and the mixer. To
diminish the impact of the switch on the performance of the VGA
and the mixer, this SPDT switch exhibits low insertion loss and
high isolation in the operating frequency range. The switch-state
control signal is provided by a Si CMOS control circuit.
DIGITAL ATTENUATOR
The digital attenuator consists of five attenuation blocks—1 dB,
2 dB, 4 dB, 8 dB, and 16 dB—each separately controlled by a Si
CMOS control circuit. Each attenuation block consists of field
effect transistor (FET) switches and resistors that form either a
pi- or a T- shaped attenuator. By controlling the states of the
FET switches through the Si CMOS control lines, each attenuation
block can be set to be in the pass state (0 dB) or the attenuation
ADL5592
state (n dB). The various combinations of the five blocks
provide the attenuation states from 0 dB to 31 dB, in 1 dB
increments.
SPI INTERFACE
The ADL5592 includes a SPI-compatible, 3-wire serial interface.
The Si CMOS interface internally level-shifts the SPI signals,
which are used to program a 10-bit shift register and to control
the loading of a 10-bit parallel latch. The outputs of the latch are
fed into drivers, which convert the logic-level outputs of the
latches to signals appropriate for driving the attenuators.
FIXED-GAIN AMPLIFIER
The output of the input attenuator (ATTN 1) is connected to a
fixed-gain amplifier that drives the output attenuator (ATTN 2).
Because the passive attenuators are linear and contribute minimal
noise, the fixed-gain amplifier is the major source of nonlinear
distortion and noise. This results in a constant OIP3 and noise
figure throughout the different attenuation stages. The fixed-gain
amplifier provides 14 dB of gain and broadband, 50 Ω, single-
ended input and output impedances.
LOOPBACK MIXER
The loopback mixer is a Si CMOS Gilbert-cell mixer designed to
provide 10 MHz to 100 MHz of frequency translation from the
RF input to the mixer output. The mixer has 50 Ω loads at the
output for a broadband, single-ended output. The input is fed
from the SPDT GaAs pHEMT switch. The overall mixer gain is
typically −17 dB. The mixer LO input is designed to operate from
10 MHz to greater than 100 MHz.
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADL5592.PDF ] | |
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