Versatile System Inputs

Versatile System Inputs - TRA...TRD

There are four versatile digital non isolated input ports in both external and internal system connectors. The ports are named TRA, TRB, TRC, and TRD.

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Versatile System Inputs

The port is extremely versatile and accepts both differential and single-ended signaling methods. Following port configurations are available:

Single-ended TTL/LVTTL
Single-ended TTL/LVTTL with Pull Down
Single-ended TTL/LVTTL with Pull Up
Single-ended High Voltage with Pull Down
Differential-ended LVDS
Differential-ended RS-422/RS-485
Differential-ended TTL/LVTTL

Each port exposes three pins named respectively TRx+, TRx-, and GND; with x = {A, B, C, D}.

A differential-ended signal is applied across TRx+ and TRx- pins; the "warm wire" of the transmission line transporting the signal TRx has to be connected to the TRx+ pin while the "cold wire" of the transmission line has to be connected to the corresponding TRx- pin. The transmission line is terminated by a 120 Ohms resistor.

A single-ended signal is applied across TRx+ and GND pins; the "warm wire" of the transmission line transporting the signal TRx has to be connected to the TRx+ pin while the "cold wire" of the transmission line has to be connected to any GND pin of the system connectors.

The port provides an automatic port configuration mode. When AUTO mode is enabled, the port determines whether a single-ended or a differential-ended signal is driving the port. When a single-ended signal is detected, the port is configured automatically as single-ended LVTTL/TTL and when a differential-ended signal is detected, the port is configured automatically as differential-ended LVDS.

When other port configurations are required, you need to configure the port manually.

DC Characteristics - Automatic mode

When configured in AUTO mode and a single-ended TTL or LVTTL signal is applied across TRx+ and GND, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Single-ended V_in+ High Threshold	Vse_th_high	1.7	V
Single-ended V_in+ Low Threshold	V_{se_th_low}	1.6	V
Single-ended V_in+ Hysteresis	V_{se_hyst}	100	mV
V_in+ Range	V_{se_max}	-10 up to 7	V
Single-ended V_in+ Impedance	R_se	High-Z

When configured in AUTO mode and a single-ended TTL and a differential LVDS signal is applied across TRx+ and TRx-, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Differential High Threshold	V_{d_th_high}	100	mV
Differential Low Threshold	V_{d_th_low}	-100	mV
Differential Hysteresis	V_{d_hyst}	100	mV
V_in Range	V_{d_max}	4.7	V
V_in+, V_in- Range	V_{se_max}	-0.7 up tp 4	V
Differential Impedance	R_d	120	Ω
Single-ended V_in+, V_in- Impedance	R_se	High-Z

DC Characteristics - Single-Ended Signaling modes

When configured in single-ended TTL or LVTTL with pull-down mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Single-ended V_in+ High Threshold	V_{se_th_high}	2.0	V
Single-ended V_in+ Low Threshold	V_{se_th_low}	1.9	V
Single-ended V_in+ Hysteresis	V_{se_hyst}	130	mV
V_in+ Range	V_{se_max}	-28 up to 29	V
Single-ended V_in+ Impedance	R_{se_pd}	7	kΩ

When configured in single-ended TTL or LVTTL with pull-up mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Single-ended V_in+ High Threshold	V_{se_th_high}	1.3	V
Single-ended V_in+ Low Threshold	V_{se_th_low}	1.1	V
Single-ended V_in+ Hysteresis	V_{se_hyst}	130	mV
V_in+ Range	V_{se_max}	-28 up to 29	V
Single-ended V_{in+ Impedance}	R_{se_pd}	7	kΩ

When configured in single-ended high voltage with pull-down mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Single-ended V_in+ High Threshold	V_{se_th_high}	7.5	V
Single-ended V_in+ Low Threshold	V_{se_th_low}	6	V
Single-ended V_in+ Hysteresis	V_{se_hyst}	400	mV
V_in+ Range	V_{se_max}	-28 up to 29	V
Single-ended V_in+ Impedance	R_{se_pd}	4.5	kΩ

DC Characteristics - Differential signaling modes

When configured in Differential terminated LVDS mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Differential High Threshold	V_{d_th_high}	100	mV
Differential Low Threshold	V_{d_th_low}	-100	mV
Differential Hysteresis	V_{d_hyst}	100	mV
DV_in+ Range	V_{d_max}	4.7	V
V_in+,V_in- Range	V_{se_max}	-0.7 up to 4	V
Differential Impedance	R_d	120	Ω
Single-ended V_in+,V_in- Impedance	R_se	High-Z

When configured in Differential terminated RS-485/RS-422 mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Differential High Threshold	V_{d_th_high}	200	mV
Differential Low Threshold	V_{d_th_low}	-200	mV
Differential Hysteresis	V_{d_hyst}	200	mV
DV_in+ Range	V_{d_max}	5.5	V
V_in+,V_in- Range	V_{se_max}	-12 up to 15	V
Differential Impedance	R_d	120	Ω

When configured in Differential terminated LVTTL/TTL mode, the following characteristics is measured at the input:

Parameter	Symbol	Value	Units
Differential High Threshold	V_{d_th_high}	2.2	mV
Differential Low Threshold	V_{d_th_low}	1.6	mV
Differential Hysteresis	V_{d_hyst}	300	mV
DV_in+ Range	V_{d_max}	5.5	V
V_in+,V_in- Range	V_{se_max}	-15 up to 15	V
Differential Impedance	R_d	120	Ω

AC Characteristics - All modes

Parameter	Symbol	Value	Units
Signal Bandwidth	BW	5	MHz