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If you do not want to use the single chip approach shown in post # 6, you

can config it (again 1 chip) to give you this basic approach :

[ATTACH=full]192981[/ATTACH]

So I show 2 DDS depending on how you will do the measurements. Note they can be 24 or 32 bit, can use their

API lib to control DDS phase and freq, or use a HW buss approach to do the control. If using 32 bit resolution is

5 mili hertz.

The DelSig is 20 bits, can config to measure to 100 mV outside each rail for range. Onchip Vref is good to +/-

.1%. Analog mux on board if needed.

The CORDIC component can be used to compute trig values if needed. Or just use code. Mixer available for

any needed signal property manipulation.

Several OpAmps on chip if G needed or impedance buffering in signal path.

USB UART and / or LCD controller for interface to user.

All components (the above, a "component" in PSOC land is an onchip resource) have a rich lib of API

calls to setup/control. Design could be done as automatic, no user intervention, using DMA and onchip

LUTs to manage.

IDE (PSOC Creator) and compiler free.

Note if you need a custom onchip component you can use schematic capture of the various

logic elements and or Verilog and create your own. Also the SOC is routable both analog and digital

onchip and of course out to pins.

Regards, Dana.