Rainbow Electronics AT84AD001B - Manual (Page 51)

51
AT84AD001B
2153C–BDC–04/04
Analog Input
Implementation The analog inputs of the dual ADC have been designed with a double pad implementa-
tion as illustrated in Figure 56. The reverse pad for each input should be tied to ground
via a 50
Ω resistor.
The analog inputs must be used in differential mode only.
Figure 56. Termination Method for the ADC Analog Inputs in DC Coupling Mode
Channel I
Channel Q
50 Ω Source
VinI
VinIB
VinQ
VinQB
VinI
VinIB
VinQ
VinQB
Dual ADC
50 Ω
50
Ω
50
Ω
50
Ω
GND
GND
50
Ω Source
GND
GND