Sundance SMT784 - Manual (Page 15)

User Manual SMT784 Page 15 of 31 Last Edited: 19/03/2009 14:12:00
External Trigger Inputs
Input Voltage Level 1.5-3.3 Volts peak-to-peak.
Format
DC-coupled and Single-ended (Termination implemented at the
connector). Differential on option (3.3 V PECL).
Impedance 50-Ohm.
Frequency range 62.5 MHz maximum
Delay
Ext. Ref. In to Ext Ref. Out
Ext. Clk In to Ext Clk Out 11ns between J29 and J4
Table 1 Clock Characteristics
5.13 ADS5500 ADCs
The main characteristics of the mezzanine ADC’s are as follows:
Analogue Inputs
Input voltage range
AC coupled option. 2.4 Vpp (11.5 dbm – 50
Ω) Full scale - AC
coupled via RF transformer.
DC-coupled option. 1.15 Vpp (Gain amplifier 6dB) centred at 0. DC-
coupled via amplifier. Gain can be adjusted to required input amplitude
centred at 0. Min. gain 6dBs, which should allow an input swing +/-
0.575V as full scale.
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.
External Reference Input
Input Voltage Level 0.5 – 3.3 Volts peak-to-peak (AC-coupled)
Input Impedance 50-Ohm (Termination implemented at the connector)
Frequency Range 0 – 100 MHz.
External Reference Output
Output Voltage Level 1.6 Volts peak-to-peak (AC-coupled)
Output Impedance 50-Ohm (Termination implemented at the connector)
External Sampling Clock Input
Input Voltage Level 0.5 – 3.3 Volts peak-to-peak (AC-coupled)
Input Format Single-ended or differential on option (3.3V LVPECL).
Frequency range 10-125 MHz
External Trigger Inputs
Input Voltage Level 1.5-3.3 Volts peak-to-peak.