Agilent Technologies DC122 User Manual download pdf (Page 21)

User Manual: Agilent Acqiris 10-bit Digitizers Page 21 of 27

Direction

Low Level

High Level

Input

<0.8 V

>2.0 to 3.45 V

Output

0 to 0.8 V

1.7 to 3.3 V

An unconnected input will be pulled high. The high level output will typically give 0.8 V into 50 Ω.

3.8.2. TRIGOUT

The TRIGOUT Signal occurs after an accepted TRIGGER. It can be chosen to be either synchronous to the Trigger

IN or synchronous to the acquisition Clock and, in this case, can be used to trigger events synchronously to the

acquisition clock.

3.9. External Trigger Output

When the digitizer is ready to be triggered and a valid trigger signal occurs, a trigger output is generated for external

use. It is always available on the Front Panel Trigger Out MMCX connector. The pulse ends when the data

acquisition for the trigger in question is complete.

NOTE: The External Trigger Output functionality is implemented in the hardware. No Trigger Out signal occurs for

software-generated triggers such as those of the AUTO mode of AcqirisLive or through the use of the function

AcqrsD1_forceTrigger. However, AcqrsD1_forceTriggerEx does generate the signal.

Trigger Output Block diagram:

The output swing is 1.6 V (± 0.8 V) when

unloaded and 0.8 V when terminated on 50

Ω. The rise and fall times are 2.5 ns typical.

The offset can be adjusted, by software

control in the range [–2.3 V, +2.3 V]

unloaded, or [-1.15 V, +1.15 V] into 50 Ω.

The maximum output current capability is ±

15 mA. As the output is retro-terminated, it

is possible to drive a 50 Ω line unterminated

(HiZ) without loss of performance.

For a TTL compatible signal, set the offset

to 1.0 V and the swing at destination will be

+0.2 to +1.8 V.

For an ECL compatible signal, terminated

on 50 Ω to –1.2 V, set the offset to –1.2 V

and the output will be in the range [–0.8 V, –

1.6 V]).

Alternatively, to reduce the current drawn from the digitizer, the terminations shown here can be used:

A standardized trigger out signal can also be routed to the PXI Bus Star Trigger line.

Signal: 1.6V swing

0v centered

Offset: +/-2.5 V

G=1

50 Ohm

Trigger Out

220

-5V

GND

Trigger

Out

With

Offset

-1.18V

220

GND

+5V

ECL

Signal

TTL

signal

Trigger Out

With

Offset

+1.18V

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Agilent Technologies DC122 User Manual Page 21

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