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ADG904-R Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADG904-R
Beschreibung Wideband 37 dB Isolation at 1 GHz CMOS 1.65V to 2.75V 4:1 Mux/SP4T
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADG904-R Datasheet, Funktion
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
50
RF2 RF2
50RFC
RFC
RF3 RF3
50
RF4 RF4
50
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.






ADG904-R Datasheet, Funktion
ADG904/ADG904-R
www.DataSheet4U.com
TERMINOLOGY
Table 5.
Parameter
Description
VDD
IDD
GND
Most Positive Power Supply Potential.
Positive Supply Current.
Ground (0 V) Reference.
Ax Logic Control Input.
VINL
VINH
IINL (IINH)
CIN
tON (EN)
Maximum Input Voltage for Logic 0.
Minimum Input Voltage for Logic 1.
Input Current of the Digital Input.
Digital Input Capacitance.
Delay between Applying the EN Control Input and the Output Switching On.
tOFF (EN)
Delay between Applying the EN Control Input and the Output Switching Off.
tRISE
tFALL
tTRANS
Off Isolation
Insertion Loss
Crosstalk
P–1 dB
IP3
Rise Time. Time for the RF signal to rise from 10% of the On level to 90% of the On level.
Fall Time. Time for the RF signal to fall from 90% of the On level to 10% of the On level.
Transition Time. Delay between applying the digital control input and the output switching on.
The Attenuation between Input and Output Ports of the Switch when the Switch Control Voltage is in the Off Condition.
The Attenuation between Input and Output Ports of the Switch when the Switch Control Voltage is in the On Condition.
Measure of Unwanted Signal Coupled through from One Channel to Another as a Result of Parasitic Capacitance.
1 dB Compression Point. The RF input power level at which the switch insertion loss increases by 1 dB over its low level
value. P–1 dB is a measure of how much power the On switch can handle before the insertion loss increases by 1 dB.
Third Order Intermodulation Intercept. This is a measure of the power in false tones that occur when closely spaced tones
are passed through a switch, whereby the nonlinearity of the switch causes these false tones to be generated.
Return Loss
The Amount of Reflected Power Relative to the Incident Power at a Port. Large return loss indicates good matching. By
measuring return loss, the VSWR can be calculated from conversion charts. VSWR (voltage standing wave ratio) indicates
the degree of matching present at a switch RF port.
Video
Feedthrough
Spurious Signals Present at the RF ports of the Switch when the Control Voltage is Switched from High to Low or Low to
High without an RF Signal Present.
Rev. 0 | Page 6 of 16

6 Page









ADG904-R pdf, datenblatt
ADG904/ADG904-R
EVALUATION BOARD
The ADG904/ADG904-R evaluation board allows designers to
evaluate the high performance, wideband switches with
minimal effort.
To prove that these devices meet the user’s requirements, only a
power supply and a network analyzer, along with the evaluation
board, are required. An application note available with the
evaluation board gives complete information on operating the
evaluation board.
The RFC port (see Figure 29) is connected through a 50 Ω
transmission line to the bottom left SMA connector, J4. RF1,
RF2, RF3, and RF4 are connected through 50 Ω transmission
lines to SMA connectors J5, J6, J7, and J8, respectively. A
through transmission line connects J9 and J10; this
transmission line is used to estimate the loss of the PCB over
the environmental conditions being evaluated.
The board is constructed of 4-layer, FR4 material with a
dielectric constant of 4.3 and an overall thickness of 0.062
inches. Two ground layers with grounded planes provide
ground for the RF transmission lines. The transmission lines
were designed using a coplanar waveguide with a ground plane
model using a trace width of 0.024 inches, clearance to ground
plane of 0.008 inches, dielectric thickness of 0.02 inches, and a
metal thickness of 0.0021 inches.
www.DataSheet4U.com
Figure 29. ADG904/ADG904-R Evaluation Board Top View
Rev. 0 | Page 12 of 16

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