Rainbow Electronics AT84AD004 - Manual (Page 49)

49
AT84AD004
5390A–BDC–06/04
Analog Input
Implementation The analog inputs of the dual ADC have been designed with a double pad implementa-
tion as illustrated in Figure 51. 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 51. 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