Fast Analog Inputs

This page contains detailed specifications and performance measurements for Gen 2 fast analog inputs.

Specifications

Parameter	Value	Units	Notes
RF inputs
RF input channels	2	-
Sampling rate	125	MS/s
ADC resolution	14	bit
Input impedance	1 MΩ (10 pF)	-
Full scale voltage range	±1 (LV) ±20 (HV)	V
Input coupling	DC	-
Absolute max. input voltage	±6 (LV) ±30 (HV)	V	DC values [1]
Input ESD protection	Yes	-
Overload protection	Protection diodes	-	(within input voltage ratings)
Bandwidth	DC - 50	MHz	Typical
Connector type	SMA	-

Note

Overload protection applies to low frequency signals. For input signals containing frequency components above 1 kHz, where capacitor divider comes into play, the full scale value defines the maximum permissible input voltage.

Hardware Details

Input stage schematics

The input stage consists of a voltage divider, buffer amplifier, anti-aliasing filter, and ADC driver.

For more information, please refer to each board’s hardware documentation.

Input coupling

Fast analog inputs are DC coupled.

Performance Measurements

Input bandwidth

Jumper settings	Bandwidth
LV	52.02 MHz (-3 dB)
HV	52.77 MHz (-3 dB)

Bandwidth measurement of the input channel 1 in LV mode.

Bandwidth measurement of the input channel 1 in HV mode.

Input bandwidth flatness

The bandwidth flatness is <0.05 dB from DC to full (-3 dB) bandwidth on LV gain setting.

Bandwidth flatness measurement of the input channel 1 in LV mode.

Input crosstalk

Crosstalk measurements were performed between input channels 1 and 2 for both LV and HV modes.

	Up to 30 MHz		Above 30 MHz
IN1IN2	LV	HV	LV	HV
LV	>70 dB	>80 dB	>50 dB	>50 dB
HV	40 dB	55 dB	>35 dB	>40 dB
IN2IN1	LV	HV	LV	HV
LV	>70 dB	55 dB	>55 dB	50 dB
HV	70 dB	55 dB	>55 dB	55 dB

Crosstalk measurements between input channels 1 and 2 in HV mode.

Calibration

Analog inputs calibration

To calibrate the analog inputs, please refer to the Calibration guide.

Footnotes

[1]

The absolute maximum input voltage values are for frequencies below 1 kHz. For higher frequencies, please use the input voltage range specifications as Absolute maximum.