Sundance SMT350 - Manual (Page 12)

Version 1.9 Page 12 of 45 SMT350 User Manual
ADC Channels.
ADC Main Characteristics.
The main characteristics of the SMT350 ADCs are gathered into the following table.
Analogue Inputs
Input voltage range
2.4 Vp-p (11.5 dbm – 50 Ohm) Full scale -
AC coupled
Impedance
ADC single-ended inputs are to be
connected to a 50
Ω source. Source
impedance matching implemented between
RF transformers and ADC.
Bandwidth ADC bandwidth: 750 MHz.
ADCs Output
Output Data Width 14-Bits
Data Format
2’s Compliment or offset binary
(Changeable via control register)
SFDR 82dBs maximum (manufacturer)
SNR 70dBs maximum (manufacturer)
Minimum Sampling Clock 10 MHz (ADC DLL off)
Maximum Sampling Frequency 125 MHz (ADC DLL on)
Figure 3 - Main features.
ADC Input Stage.
Each ADC Analogue input is AC-coupled via and RF transformer. The 50-Ohm
resistor between the connector and the first RF transformer is not fitted because the
source impedance match is implemented between the second RF transformer and
the ADC by the way of two 25-Ohm resistors.
Figure 4 - ADC Input Stage.