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Partno	Mfg	Dc	Qty	Available	Descript
ADG904BRU	AD	N/a	8	avai	Wideband, 37 dB Isolation at 1 GHz, CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T

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ADG904BRU
Wideband, 37 dB Isolation at 1 GHz, CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T
Wideband, 37 dB Isolation at 1 GHz,
CMOS 1.65 V to 2.75 V, 4:1 Mux/SP4T
Rev. 0
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
FUNCTIONAL BLOCK DIAGRAMS
ADG904
RFCA1EN
RF1
RF2
RF3
RF4
04504-0-001
ADG904-R
RFCA1EN
RF1
RF2
RF3
RF4
04504-0-012
Figure 1 Figure 2
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.
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
04504-0-028FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–80
04504-0-029FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–0.3–0.4–0.5–0.6–0.7–0.8–0.9–1.0–1.1–1.2–1.3–1.4–1.5–1.6–1.7–1.8–1.9–2.0–2.1–2.2–2.3–2.4–2.5–2.6–2.7–2.8–2.9–3.0
Figure 3. Off Isolation vs. Frequency Figure 4. Insertion Loss vs. Frequency
TABLE OF CONTENTS
Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
Pin Configuration and Function Descriptions.............................5
Terminology......................................................................................6
Typical Performance Characteristics.............................................7
Test Circuits.......................................................................................9
Applications.....................................................................................11
Absorptive vs. Reflective............................................................11
Antenna Diversity Switch..........................................................11
Filter Selection............................................................................11
Tx/Rx Switching.........................................................................11
Evaluation Board............................................................................12
Outline Dimensions.......................................................................13
Ordering Guide..........................................................................13
REVISION HISTORY
Revision 0: Initial Version
SPECIFICATIONS
Table 1. VDD = 1.65 V to 2.75 V, GND = 0 V, Input Power = 0 dBm, all specifications TMIN to TMAX, unless otherwise noted1
Temperature range B Version: −40°C to +85°C. Typical values are at VDD = 2.5 V and 25°C, unless otherwise stated.
3 Operating frequency is the point at which insertion loss degrades by 1.5 dB. Guaranteed by design, not subject to production test.
5 Video feedthrough is the dc transience at the output of any port of the switch when the control voltage is switched from high to low or low to high in a 50 Ω test
setup, measured with 1 ns rise time pulses and 500 MHz bandwidth.
ABSOLUTE MAXIMUM RATINGS
Table 2. TA = 25°C, unless otherwise noted
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may
affect device reliability. Only one absolute maximum rating may
be applied at any one time.
Table 3. Truth Table

1 RFx Off Port Inputs to Ground = –0.5 V to VDD – 0.5 V. OFF Switches have:
50 Ω termination to GND (ADG904).
Shunt to GND (ADG904-R).
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VDD
GND
RF1
GND
GND
RF3
GND
GND
RF2
GND
GND
RF4
GND
GND
RFC
GND
GND
Figure 5. 20-Lead TSSOP (RU-20)
Table 4. Pin Function Descriptions
TERMINOLOGY
Table 5.
TYPICAL PERFORMANCE CHARACTERISTICS
04504-0-015FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–0.3–0.4–0.5–0.6–0.7–0.8–0.9–1.0–1.1–1.2–1.3–1.4–1.5–1.6–1.7–1.8–1.9–2.0–2.1–2.2–2.3–2.4–2.5–2.6–2.7–2.8–2.9–3.0
Figure 6. Insertion Loss vs. Frequency over Supplies
(RF1–RF4, S12, and S21)
04504-0-014FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–1.1
Figure 7. Insertion Loss vs. Frequency over Supplies
(RF1-RF4, S12, and S21) Zoomed Figure 6 Plot)
04504-0-013FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–3.0
Figure 8. Insertion Loss vs. Frequency over Supplies
04504-0-016FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–0.3–0.4–0.5–0.6–0.7–0.8–0.9–1.0–1.1–1.2–1.3–1.4–1.5–1.6–1.7–1.8–1.9–2.0–2.1–2.2–2.3–2.4–2.5–2.6–2.7–2.8–2.9–3.0
Figure 9. Insertion Loss vs. Frequency over Temperature
(RF1-RF4, S12, and S21)
04504-0-017FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–100
Figure 10. Isolation vs. Frequency over Supplies
(RF1-RF4, S12, and S21)
04504-0-018FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–100
Figure 11. Isolation vs. Frequency over Temperature
04504-0-020FREQUENCY (Hz)
10G10k100k1M10M100M1G
SER
TION
LOSS (
–35
Figure 12. Return Loss vs. Frequency (RF1-RF4, S11)
04504-0-025FREQUENCY (Hz)
10G10k100k1M10M100M1G
CROS
ALK (dB)
–80
Figure 13. Crosstalk vs. Frequency
CH1Ch2M 5.00ns
1.00V
100mV
100mV
TEK RUN: 5.00GS/s ET ENVELOPET[]
Figure 14. Switch Timing
∆ : 2.40mV
Figure 15. Video Feedthrough
04504-0-019FREQUENCY (MHz)
IP3 (
Figure 16. IP3 vs. Frequency
04503-0-025FREQUENCY (MHz)
B (dBm)
Figure 17. P-1dB vs. Frequency

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