ADG904BRU

Switch Time (Ton, Toff) (Max):	10ns, 16ns
Base Part Number:	ADG904
Supplier Device Package:	20-TSSOP
Package / Case:	20-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Crosstalk:	-58dB @ 100MHz
Current - Leakage (IS(off)) (Max):	1µA
Channel Capacitance (CS(off), CD(off)):	2pF
Charge Injection:	--
-3db Bandwidth:	2.5GHz
Series:	--
Voltage - Supply, Dual (V±):	--
Voltage - Supply, Single (V+):	1.65 V ~ 2.75 V
Channel-to-Channel Matching (ΔRon):	--
On-State Resistance (Max):	--
Number of Circuits:	1
Multiplexer/Demultiplexer Circuit:	4:1
Switch Circuit:	SP4T
Part Status:	Obsolete
Packaging:	Tube

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ADG904BRU Application Field and Working Principle

ADG904BRU is an interface-type analog switch, multiplexer, and demultiplexer used in a variety of settings. It is capable of controlling frequencies up to 7.5GHz, through the use of different types of inputs (a single differential pair, or a variety of single ended inputs). ADG904BRUs are suitable for use in a diverse array of applications, such as wireless communication systems, test measurement systems, active mixing and automatic test equipment, etc. This article will discuss the application field and working principle of ADG904BRU.

Application Field

ADG904BRU is broadly used in the communication systems. It is typically used in wireless communications, since it can accommodate high frequency signals. This type of switching device is suitable for applications requiring very high-speed switching of single-ended or differential signals. In addition, the device is suitable for applications needing a low power dissipation and ESD (electrostatic discharge) protection.ADG904BRU can also be used in test and measurement systems. The device is commonly used in measurement and testing applications of RF (Radio Frequency) signals. In these cases, the device is used to measure or make many single or differential input-controlled electrical parameters. These parameters include gain, phase, noise figure, etc.

Working Principle

The core of the ADG904BRU is a set of nine double-pole double-throw switches, each consisting of two N-type metal oxide semiconductor (NMOS) switches and two P-type metal oxide semiconductor (PMOS) switches. A PMOS switch has one gate and two drain terminals. When one gate is positive, the drain nodes connected to the gate will source current. An NMOS switch has one gate and two source terminals. When one gate is negative, the source nodes connected to the gate will sink current. In addition to the nine double-pole double-throw switches, the ADG904BRU has an internal controlling circuitry. This circuitry provides a series of CFB (common feedback) terminals that act as a single differential precision voltage reference. This voltage reference is used to control the switching operation of the switches. When a signal is applied, the controlling circuitry evaluates the current flow and produces a voltage depending on the current flow. This voltage is used to control the specific switch’s internal control circuitry, thus turning the switch on or off. The ADG904BRU features up to four selectable output states that are controlled by two logic inputs. This allows for four distinct output states which can be independently controlled. Furthermore, the device features two logic enable inputs that can be used to put the device into an inactive state. In this state, all switches are ‘OFF’ and the output is disconnected or steered to a high impedance state. Finally, the ADG904BRU has an ‘OPEN ZERO’ feature that can be activated using a logic signal. When this feature is activated, the logic output state is set to a low impedance state.

Conclusion

ADG904BRU is a versatile analog switch, multiplexer, and demultiplexer which can be used in a variety of applications, such as wireless communication systems, test measurement systems, active mixing, and automatic test equipment. It operates using a set of nine double-pole double-throw switches and an internal controlling circuitry, and is capable of providing up to four selectable output states. Furthermore, the device features ‘OPEN ZERO’ and logic enable inputs, which offer additional flexibility in signal control.

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