ADG904_15 Datasheet, PDF (1/17 Pages) Analog Devices – CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T

Data Sheet
Wideband 2.5 GHz, 37 dB Isolation at 1 GHz,
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 control logic
20-lead TSSOP and 4 mm × 4 mm LFCSP packages
Low power consumption (1 μA maximum)
Qualified for automotive applications
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 and ADG904-R are wideband analog 4:1
multiplexers 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 isolation is high over the dc to 1 GHz frequency range.
The ADG904 and ADG904-R switch 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
V_DD = 2.5V
–20
–30
–40
–50
S21
–60
–70
S12
–80
10k
100k
1M
10M
100M
1G
10G
FREQUENCY (Hz)
Figure 3. Off Isolation vs. Frequency
Rev. C
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ADG904
RF1
FUNCTIONAL BLOCK DIAGRAMS
ADG904-R
RF1
50
RF2
RF2
50
RFC
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, which eliminates
the need for external control circuitry. The control inputs
are both CMOS and LVTTL compatible. The low power
consumption of these devices 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/LFCSP 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 V_DD = 2.5V
–2.9
–3.0
T_A = 25°C
10k
100k
1M
10M
100M
1G
10G
FREQUENCY (Hz)
Figure 4. Insertion Loss vs. Frequency
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