USERS MANUAL ISL54409EVAL1Z, ISL54410EVAL1Z AN1501 Rev 0.00 Evaluation Boards October 8, 2009 Description The ISL54409EVAL1Z and ISL54410EVAL1Z evaluation board are designed to provide a quick and easy method for evaluating the ISL54409 and ISL54410 Audio/USB wired-OR IC switch. To use the evaluation board properly requires a thorough knowledge on the operation of the ISL54409 and ISL54410 IC. Refer to the ISL54409, ISL54410 data sheet for the features and functions of the device. Studying the devices logic truth table along with the Applications Block Diagram is a quick way to understanding the operation of the IC. A picture of the main evaluation board is shown in Figure 1. The ISL54409, ISL54410 TQFN IC is soldered onto the evaluation board. It is designated as U1. The ISL54409 and ISL54410 is a dual SPST audio switch with low OFF capacitance on the output terminals. This allows USB 2.0 HS signals to be connected to the output terminals with minimal degradation of the USB signal in a wired-OR configuration for 2:1 multiplexing of audio and USB2.0 signals to a common connector. For example, a headphone can be plugged into the FIGURE 1. ISL54409EVAL1Z EVALUATION BOARD headphone jack (J11) and an audio signal can be (TOP VIEW) applied to the BNC connectors J9 and J10 when the switch is placed into the audio mode. The switch can be turned off and placed into the USB mode, allowing a Board Architecture/Layout USB 2.0 device to be plugged into J4 and a USB 2.0 Basic Layout of Evaluation Board Host to be plugged into J5. The USB D+ and D- lines are connected to the switch COM+ and COM- terminals The basic layout of the main board is as follows: Refer which allows a mutually exclusive common connector to Figure 1. for multiplexing audio and USB signals. 1. VCC and GND connections are at the top of the The ISL54409 features a low power shut down mode board (J1 and J2). The board operates on a +2.7V while the ISL54410 features integrated Audio Click and to +5.0V power supply. Pop Elimination. This application note will guide the 2. Logic control connections are at the top of the user through the process of configuring and using the board (J3 and J8 for external control. S1 and S2 evaluation board to evaluate the ISL54409 or for on-board control). ISL54410 device. 3. Audio inputs are at the upper right side of the board (J9 and J10). Audio outputs are at the Key Features standard headphone connector (J11). Standard USB Connectors 4. USB connection to an upstream host controller is BNC Input Jacks and Headphone Speaker Jack made at connector J5. USB connection to a On-board or External Logic Control downstream USB device is made at connector J4. Convenient Test Points and Connections for Test 5. Located below S1 of the board is the ISL54409 or Equipment ISL54410 IC (U1). AN1501 Rev 0.00 Page 1 of 5 October 8, 2009ISL54409EVAL1Z, ISL54410EVAL1Z Power Supply Audio Outputs The DC power supply connected at banana jacks J1 The evaluation board has a standard headphone jack (VCC) and J2 (GND) provides power to the evaluation (J11) connected to the COM- and COM+ pins. A board. The IC requires a +2.7V to +5.0V DC power headphone with a 3.5mm audio jack can be plugged into supply for proper operation. The power supply should be the evaluation board. capable of delivering 100A of current. *Note that in a typical application the USB and audio connections use a common connector. This evaluation Logic Control board has separate connectors for USB and audio for The state of the ISL54409 and ISL54410 device is simplicity in evaluating the performance of USB and determined by the voltage at the IN pin and the CTRL audio signals. However, for optimal USB 2.0 HS pin. When the JP1 three pin jumper is in the 1-2 position, performance, the headphone jack can be disconnected access to the IN pin is through the BNC connector J3. from the COM-/COM+ path. This can be done by When the jumper is in the 2-3 position, access to the IN depopulating resistors R and R on the evaluation 6 7 pin is through switch S1. When the JP2 three pin jumper board. is in the 2-3 position, access to the CTRL pin is through the BNC connector J8. When the jumper is in the 1-2 USB Connections position, access to the CTRL pin is through switch S2. A type A USB receptacle (J4) and a type B USB The IN and CTRL pins are 1.8V logic compatible which receptacle (J5) is located on the left side of the board. allows for control via a standard controller. The type B receptacle should be connected using a Logic 0 (LOW) when 0.5V or floating standard USB cable to the upstream USB host controller Logic 1 (HIGH) when 1.4V which is usually a PC computer or hub. A USB device can be plugged directly into this receptacle. When this Note: The evaluation board has a 1M pull-down resistor connection is made and the IN logic control is driven from the IN pin to ground and CTRL pin to ground. In HIGH, the ISL54409, ISL54410 device will go into USB addition, the ISL54409 and ISL54410 IC have an internal mode. The switches will be turned OFF and the USB Host 4Mpull-down resistor on the IN and CTRL logic pins. If and USB device can communicate. the user wishes to remove the 1Mresistors on the board simply depopulate R for the CTRL pin and R for Note: Before operating in the USB mode, the 2 3 the IN pin. headphones must be removed from the headphone speaker jack. This will prevent the audio load from If IN is LOW and CTRL is HIGH the part will be in the interfering with USB signal transmission. The main Audio mode. The switches will be ON and can pass audio purpose of the ISL54409, ISL54410 IC is to allow the use signals from the LIN/RIN to COM-/COM+. If IN is driven of a common USB and Audio Headphone Connector in HIGH and CTRL = X (dont care) the part will be in the Personal Media Players and other portable battery USB mode. The switches will be turned OFF, providing powered equipment. Either a headphone will be in the excellent signal isolation from LIN/RIN to COM-/COM+. common connector to play music or a USB cable from a For the ISL54409 if IN is logic 0and CTRL is logic 0 computer will be in the common connector to transmit digital data. the part will be in the Low Power mode. In Low Power mode both switches are OFF and the part will draw less TABLE 1. EVALUATION BOARD COMPONENT than 10nA typically. DEFINITIONS For the ISL54410 if IN is logic 0and CTRL is logic 0 DESIGNATOR DESCRIPTION the part will be in the Audio Click and Pop mode. In Audio U1 ISL54409IRUZ or ISL54410IRUZ IC Click and Pop mode both switches are OFF and the LIN/RIN pins will have a 40 shunt path to ground. J1 VCC Banana Jack Connection Audio Inputs J2 GND Banana Jack Connection The evaluation board has two audio inputs, LIN (J9) and J3 IN Logic Control BNC Connector RIN (J10) using BNC connectors on the right side of the J4, J5 Standard USB Connectors evaluation board. Over a signal range of -1V to +1V ) these switches have an extremely low (0.707V J8 CTRL Logic Control BNC Connector RMS ON-resistance variation. The r of the switch is typically ON J9 LIN BNC Connector less than 3. They can pass ground referenced audio signals with very low distortion (<0.04% THD+N) when J10 RIN BNC Connector delivering 4mW into a 32 headphone speaker load. A S1 IN Logic Control Toggle Switch signal range above 0.707V is acceptable but THD+N RMS performance will degrade. S2 CTRL Logic Control Toggle Switch AN1501 Rev 0.00 Page 2 of 5 October 8, 2009