TS4100DB

TS4100 Demo Board FEATURES       “Rail-to-Rail PlusTM”, 1% RON Flatness, 0.8V to 5.25V Analog 8-Channel Switch/Multiplexer DESCRIPTION 8-Channel Switch/Multiplexer Low Supply Voltage Operation: 0.8V to 5.25V On-Resistance of 80Ω TM Rail-to-Rail Plus ” input/output voltages can exceed the supply rails Fully Assembled and Tested 2in x 2in 4-layer circuit board COMPONENT LIST DESIGNATION QTY The demo board for the TS4100 is a completely assembled and tested circuit board that can be used for evaluating the analog 8-channel switch/multiplexer. This switch/multiplexer is unique as it can operate at a supply voltage as low as 0.8V while accepting an input signal swing above the TM supply voltage up to 5.25V (“Rail-to-Rail Plus ”). The on-resistance variation over the entire signal swing range is less than 1% exhibiting excellent linearity and consistency in dynamic and measurement applications. DESCRIPTION C1 1 C2 1 R1-R8 R9 U1 VDD, COM, GND, 0-7 J1, INH, A, B, C 8 1 1 12 10pF ±10% capacitor (0603) 1µF ±10% capacitor (0603) 100kΩ ± 1% (0603) 1kΩ ± 1% (0603 TS4100 Test points 5 Jumper The board is configured for testing all 8 channels, NO0-NO7, with a DC input voltage derived from VDD. Jumper INH is available to turn all switches OFF. Jumper A, B, and C is available to select a channel. The TS4100 is fully specified over the -40°C to +85°C temperature range and is available in a low-profile, thermally-enhanced 16-pin 3x3mm TQFN package with an exposed back-side paddle. For best performance, solder exposed back-side paddle to PCB ground. Product datasheet and additional documentation can be found on the factory web site at www.touchstonesemi.com. ORDERING INFORMATION Order Number TS4100DB Figure 1. TS4100 Demo Board (Top View) Description TS4100 Demo Board Figure 2. TS4100 Demo Board (Bottom View) Page 1 © 2013 Touchstone Semiconductor, Inc. All rights reserved. TS4100 Demo Board DESCRIPTION 3. Set jumper A, B, and C to a HIGH state by moving the jumper position from LO to HI. The TS4100 demo board is configured with a COM output resistor and capacitor load of 1kΩ and 10pF. The TS4100 operates at a supply voltage range of 0.8V to 5.25V and an analog input/output “Rail-to-Rail TM Plus ” range of 0V to 5.25V. 4. Find the 16-pin header on the board labeled INPUTS. Place a jumper on the two-pin header labeled 7. This sets a DC voltage to channel NO7. The TS4100 can be tested with an on-board DC input signal or an external AC input signal. The on-board voltage is generated via a voltage divider circuit. The complete demo board circuit is shown in Figure 3. To select a channel or turn OFF all channels, jumper A, B, C, and INH can be set according to Table 1. ADDRESS BITS COM Output A B C X X X GND 1 0 0 0 0 NO0 0 0 0 1 NO1 0 0 1 0 NO2 0 0 1 1 NO3 0 1 0 0 NO4 0 1 0 1 NO5 0 1 1 0 NO6 0 1 1 1 NO7 Table 1: Jumper A, B, C, and INH Setting INH QUICK START PROCEDURE Required Equipment 5. To monitor the COM output signal, connect the positive terminal of the digital voltmeter to the test point labeled as COM and the negative terminal to the adjacent test point labeled as GND. 6. Turn on the power supply and check that the digital voltmeter is reading an output voltage of approximately 1.39V. With an output voltage of 1.39V across an output resistor value of 1kΩ, the resulting load current is 1.39mA. This yields an on-resistance of approximately 79Ω, which is well within the datasheet on-resistance specification. 7. To test a different channel, refer to Table 1 and make the appropriate changes to jumper A, B, and C. MEASURING THE SUPPLY CURRENT 8. Turn off the power supply and connect a digital ammeter in series with the power supply. 9. Remove the positive terminal of the digital voltmeter from the COM output test point. 10. Remove jumper J1 and the jumper on the selected channel.  TS4100 Demo Board  DC Power Supply  Digital Ammeter, an HP34410A or equivalent 11. Turn on the power supply and check that the digital ammeter is reading a supply current less than 765nA.  Digital Voltmeter, an HP34410A or equivalent APPLYING AN EXTERNAL INPUT SIGNAL To evaluate the TS4100 analog 8-channel switch/multiplexer, the following steps are to be performed: 1. Before connecting the DC power supply to the demo board, turn on the power supply, set the DC voltage to 1.5V, and then turn it off. 2. Connect the DC power supply positive terminal to the test point labeled VDD. Connect the negative terminal of the DC power supply to the test point labeled GND. TS4100DB r1p0 12. Turn off the power supply. 13. Connect the positive terminal of a DC power supply or an AC signal generator to the test point labeled “0” on the 16-pin header labeled INPUTS. Connect the negative terminal to a test point labeled GND. For an AC input signal, make sure the maximum input voltage level is less than 5.25V and the minimum input voltage level is greater than 0V. For a DC input signal, make sure the input voltage is less than 5.25V and greater than 0V. Page 2 RTFDS TS4100 Demo Board 14. Check that the AC input signal levels are within the levels specified in the previous step with an oscilloscope. Check a DC input voltage level with a voltmeter. 17. Turn on the DC power supply input signal or AC signal generator. For a DC input signal, monitor the digital voltmeter. For an AC input signal, monitor the oscilloscope. 15. With an applied DC input signal, connect the positive terminal of the digital voltmeter to the test point labeled as COM and the negative terminal to the adjacent test point labeled as GND. With an applied AC input signal, connect the signal terminal of an oscilloscope probe to the test point labeled as COM and the ground terminal to the adjacent test point labeled as GND. TURN OFF ALL SWITCHES 18. Turn off the power supply. 19. Remove the jumper between INH and LO and connect it between INH and HI. Refer to Table 1. 16. Turn on the power supply. Figure 3. TS4100 Demo Board Circuit TS4100DB r1p0 Page 3 RTFDS TS4100 Demo Board Figure 4. Top Layer View #1 Figure 5. Top Layer View #2 Figure 6. Layer 2 Figure 7. Layer 3 Figure 8. Bottom Layer 4 View #1 Figure 9. Bottom Layer 4 View #2 Page 4 Touchstone Semiconductor, Inc. 630 Alder Drive, Milpitas, CA 95035 +1 (408) 215 - 1220 ▪ www.touchstonesemi.com TS4100DB r1p0 RTFDS