TDC7201 appears to be the same as the TDC7200 except that there are two synchronized TDC cores and each TDC core has two extra "coarse" bits. The eval board for TDC7201 (p/n TDC7201-ZAX-EVM) is $75. You need a ~$25 MSP430 baseboard to make it go. -christopher 73 de AI6KG