AD484 user manual
V1.2
AD484 User manual
February 2007
www.4dsp.com
- 14 -
3.5 A/D inputs and outputs main characteristics
Analogue inputs
Input voltage range
AC coupled option. 2.4 Vp-p (11.5 dbm
–
50 Ohm) Full scale - AC
coupled via RF transformer. DC coupled option. 1.15 Vp-p (Gain
amplifier 6dB) centered around 0. DC coupled via amplifier. Gain
can be adjusted to a required input amplitude centered around 0.
Minimm gain 6dBs, which should allow input swing +/-0.575V as
full scale.
Impedance
ADC single-ended inputs are to be connected to a 50
Ù
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
0-100MHz
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
10-125MHz
External Trigger inputs
Format
DC-coupled and Single-ended (Termination implemented at the
connector). Differential on option (3.3 V PECL).
Input Voltage range
1.5-3.3 Volts peak-to-peak.
Impedance
50-ohm
Frequency range
62.5MHz maximum
ADC Output
Output Data Width
14-bit
Data Format
2
’
s Compliment or offset binary (Changeable via control
register)
SFDR
82dBs maximum (manufacturer)
SNR
70dBs maximum (manufacturer)
Maximum Sampling Frequency
125MHz.
Table 6: AD484 A/D characteristics
