Features and Benefits
- Fully featured evaluation board for the LTC2065/LTC2068
- Enables efficient prototyping
- User defined circuit configuration
- Simplified connection to test equipment and other circuits
TThe EVAL-LTC2065/LTC2068-TQFN evaluates the LTC2065 and LTC2068 16-lead, quad-channel, lead frame chip scale package (LFCSP)/quad flat no-lead (QFN) operational amplifier (op amp). The EVAL-LTC2065/LTC2068-TQFN is a prepopulated board using a gain of 2 configuration with a low-pass filter at the noninverting input. This filter has a cutoff frequency of 480 Hz for the LTC2065 and 2.4 kHz for the LTC2068. This frequency minimizes the effect of chopper clock feedthrough to at least a decade below the internal chopping frequency of 5 kHz and 25 kHz for the LTC2065 and LTC2068, respectively. Signal bandwidths are also limited due to slew rate limitations of the devices.
The EVAL-LTC2065/LTC2068-TQFN design allows simplified and efficient use. Bulk test points are used for the inputs and outputs. The optimized EVAL-LTC2065/LTC2068-TQFN ground plane, component placement, and power supply allow maximum circuit flexibility and performance. The exposed pad (EPAD) is shorted to the V− pin (also connected to the VS− turret), which is required for device operation. The EVAL-LTC2065/LTC2068-TQFN combines surface-mount technology (SMT) with almost all components being 0805 in size to provide simplified installation and the option to replace and solder when needed, except for the bypass capacitors (C1 to C4) that are fixed in 0603 sizes. The EVAL-LTC2065/LTC2068-TQFN also has unpopulated resistor and capacitor pads, which provide the user with the options and flexibility to implement different application circuits and configurations, such as active loop filters, transimpedance amplifiers (TIAs), and sense amplifiers.
Refer to the LTC2065 and LTC2068 data sheet for full specifications in conjunction with this user guide when using the EVAL-LTC2065/LTC2068-TQFN.