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Operation Theory • 61

Summary of the auxiliary function input signals and the corresponding

functionalities

Category Timing signal

Functionality Constraints

EXTTIMEBASE

Replace the

internal

TIMEBASE

1. TTL-compatible

2. 1MHz to 40MHz

3. Affects on both A/D and

D/A operations

EXTDTRIG

External digital

trigger input for

A/D operation

1. TTL-compatible

2. Minimum pulse width =

20ns

3. Rising edge or falling edge

Dedicated

input

EXTWFTRG

External digital

trigger input for

D/A operation

1. TTL-compatible

2. Minimum pulse width =

20ns

3. Rising edge or falling edge

Replace the

internal

ADCONV

1. TTL-compatible

2. Minimum pulse width =

20ns

3. Rising–edge sensitive only

AFI[0]

(Dual functions)

Replace the

internal

SCAN_START

1. TTL-compatible

2. Minimum Pulse

width > 2/TIMEBASE

Multi-

function

input

AFI[1]

Replace the

internal DAWR

1. TTL-compatible

2. Minimum pulse width =

20ns

3. Rising–edge sensitive only

Table 15: Auxiliary function input signals and the corresponding

functionalities