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PDF ADG904 Data sheet ( Hoja de datos )
| Número de pieza | ADG904 | |
| Descripción | Wideband 37 dB Isolation at 1 GHz CMOS 1.65V to 2.75V 4:1 Mux/SP4T | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADG904 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Wideband, 37 dB Isolation at 1 GHz,
www.DataSheet4U.com
CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T
ADG904/ADG904-R
FEATURES
Wideband switch: –3 dB @ 2.5 GHz
ADG904: Absorptive 4:1 Mux/SP4T
ADG904-R: Reflective 4:1 Mux/SP4T
High off isolation (37 dB @ 1 GHz)
Low insertion loss (1.1 dB dc to 1 GHz)
Single 1.65 V to 2.75 V power supply
CMOS/LVTTL contol logic
20-lead TSSOP
Low power consumption (1 µA max)
APPLICATIONS
Wireless communications
General-purpose RF switching
Dual-band applications
High speed filter selection
Digital transceiver front end switch
IF switching
Tuner modules
Antenna diversity switching
GENERAL DESCRIPTION
The ADG904/ADG904-R are wideband analog 4:1multiplexers
that use a CMOS process to provide high isolation and low
insertion loss to 1 GHz. The ADG904 is an absorptive/matched
mux with 50 Ω terminated shunt legs; the ADG904-R is a
reflective mux. These devices are designed such that the isola-
tion is high over the dc to 1 GHz frequency range.
The ADG904/ADG904-R switches one of four inputs to a
common output, RFC, as determined by the 3-bit binary
address lines A0, A1, and EN. A Logic 1 on the EN pin disables
the device.
–10
VDD = 2.5V
–20
–30
–40
–50
S21
–60
–70 S12
–80
10k
100k
1M 10M 100M
FREQUENCY (Hz)
1G
10G
Figure 3. Off Isolation vs. Frequency
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. Trademarks and
registered trademarks are the property of their respective owners.
ADG904
RF1
FUNCTIONAL BLOCK DIAGRAMS
ADG904-R
RF1
50Ω
RF2 RF2
50Ω RFC
RFC
RF3 RF3
50Ω
RF4 RF4
50Ω
1 OF 4 DECODER
A0 A1 EN
1 OF 4 DECODER
A0 A1 EN
Figure 1
Figure 2
The parts have on-board CMOS control logic, thus eliminating
the need for external control circuitry. The control inputs are
both CMOS and LVTTL compatible. The ADG904/ADG904-R’s
low power consumption makes them ideally suited for wireless
applications and general-purpose high frequency switching.
PRODUCT HIGHLIGHTS
1. –37 dB off isolation @ 1 GHz
2. 1.1 dB insertion loss @ 1 GHz
3. 20-lead TSSOP packages
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
–1.1
–1.2
–1.3
–1.4
–1.5
–1.6
–1.7
–1.8
–1.9
–2.0
–2.1
–2.2
–2.3
–2.4
–2.5
–2.6
–2.7
–2.8 VDD = 2.5V
–2.9
–3.0
TA = 25°C
10k 100k
1M 10M 100M
FREQUENCY (Hz)
1G
Figure 4. Insertion Loss vs. Frequency
10G
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
EN 1
20 A0
VDD 2
19 A1
GND 3 ADG904 18 GND
RF1 4 ADG904-R 17 RF2
GND 5 TOP VIEW 16 GND
GND 6 (Not to Scale) 15 GND
RF3 7
14 RF4
GND 8
13 GND
GND 9
12 GND
RFC 10
11 GND
Figure 5. 20-Lead TSSOP (RU-20)
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Table 4. Pin Function Descriptions
Pin No.
Mnemonic
1 EN
2 VDD
3, 5, 6, 8, 9, 11, 12, 13,
15, 16, 18
4
7
10
14
17
19
20
GND
RF1
RF3
RFC
RF4
RF2
A1
A0
Function
Active Low Digital Input. When high, the device is disabled and all switches are off. When low, Ax
logic inputs determine on switches.
Power Supply Input. These parts can be operated from 1.65 V to 2.75 V. VDD should be decoupled
to GND.
Ground Reference Point for All Circuitry on the Part.
RF1 Port.
RF3 Port.
Common RF Port for Switch.
RF4 Port.
RF2 Port.
Logic Control Input.
Logic Control Input.
Rev. 0 | Page 5 of 16
5 Page 
APPLICATIONS
The ADG904/ADG904-R are ideal solutions for low power,
high frequency applications. The low insertion loss, high
isolation between ports, low distortion, and low current
consumption of these parts make them excellent solutions for
many high frequency switching applications. They may be used
in applications such as switchable filters, transmitters and
receivers for radar systems, and communication systems from
base stations to cell phones.
The ADG9xx wideband switches are designed to meet the
demands of devices transmitting at ISM band frequencies to
1 GHz and higher. The low insertion loss, high isolation
between ports, single pin control interface, no requirement for
dc blocking capacitors, and TTL interface compatibility make
them cost effective and easy to integrate switching solutions for
many high frequency switching applications and low power
applications where the parts can handle up to 16 dBm of power.
ABSORPTIVE VS. REFLECTIVE
The ADG904 is an absorptive (matched) switch with 50 Ω
terminated shunt legs; the ADG904-R is a reflective switch with
0 Ω terminated shunts to ground. The ADG904 absorptive
switch has a good VSWR on each port, regardless of the switch
mode. An absorptive switch should be used when there is a
need for a good VSWR that is looking into the port but not
passing the through signal to the common port. The ADG904 is
therefore ideal for applications that require minimum
reflections back to the RF source. It also ensures that the
maximum power is transferred to the load.
The ADG904-R reflective switch is suitable for applications
where high off port VSWR does not matter and the switch has
some other desired performance feature. It can be used in many
applications, including high speed filter selection. In most cases,
an absorptive switch can be used instead of a reflective switch,
but not vice versa.
ANTENNA DIVERSITY SWITCH
The ADG904 is ideal for use as an antenna diversity switch,
switching in different antennas to the tuner. The low insertion
loss ensures minimum signal loss and high isolation between
channels, making these SP4T switches suitable for switching
applications in tuner modules and set-top boxes.
wAwDw.GDa9ta0S4he/AetD4UG.c9o0m4-R
ANTENNA
VGA
RF1
CABLE
RF2
RF3
ADG904
TUNER
RF4
Figure 26. Tuner Modules
FILTER SELECTION
The ADG904 can be used to switch high frequency signals
between different filters, and to multiplex the signal to the
output. These SP4T switches are also ideal for high speed signal
routing.
RF1 RF1
RFIN
RFC
ADG904
RF2
RF3
RF2
ADG904
RFOUT
RFC
RF3
RF4 RF4
Figure 27. Filter Selection
Tx/Rx SWITCHING
The low insertion loss and high isolation between ports ensures
that the ADG904/ADG904-R is a suitable transmit/receive
switch for all ISM band and WirelessLAN, providing the
required isolation between the transmit and receive signals.
ANTENNA
Rx
Rx
Tx ADG904
Rx
Rx
Figure 28. Tx/Rx Switching
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADG904.PDF ] | |
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