SCDS466A August 2023 – December 2024 TMUX7612
PRODUCTION DATA
Figure 9-1 shows one example of how two TMUX7612 can be used to gang two PMU channels together for higher current serial measurements while keeping the option for lower current parallel measurements. Here, switches S1 and S2 are used to gang the output current of the two force amplifiers in parallel to achieve a higher current output. The measure current amplifiers sense the current over the shunt resistors as a feedback to the force amplifier. S3 and S4 are used to select the DUT (device under test) channel. S7 and S8 are switched so that the correct DUT channel voltage can be measured by the measure voltage amplifier. Finally, S5 and S6 can be used when S1, S2, S3, and S4 are open to force current on both DUT channels in parallel if the higher current is not needed. This is only a two PMU channel solution but the amount of channels can be increased to any number by adding more switches.
The TMUX7612 can support 1.8-V logic signals on the control input, allowing the device to interface with low logic controls of an FPGA or MCU. All inputs to the switch must fall within the recommend operating conditions of the TMUX7612 including signal range and continuous current. For this design with a positive supply of 37.5 V on VDD, and a negative supply of -12.5 V on VSS, the signal range can be 37.5 V to -12.5 V. For the best linear performance, the signal range should be held within a 5 V headroom below the positive and above the negative supplies. The maximum continuous current (IDC) can be up to 470 mA as shown in the Recommended Operating Conditions table for wide-range current measurement.