AD1671

ASD0010777 Rev. M | Page 4 of 7

Table I (Continued)

TABLE I NOTES:

1/

2/

This parameter is guaranteed, but not necessarily tested.

3/

4/

The AD1671 includes an onboard +2.5 V reference. The reference input pin (REF IN) can be connected

to reference output pin (REF OUT) or a standard external +2.5 V reference can be selected to meet

specific system requirements. Fast switching input dependent currents are modulated at the reference

input. The reference input voltage can be held with the use of a capacitor. To prevent the AD1671’s

onboard reference from oscillating when not connected to REF IN, REF OUT must be connected to +5 V.

It is possible to connect REF OUT to +5 V due to its output circuit implementation which shuts down the

reference

Encode Pulse High

Figure 3.Timing Diagrams

Parameter

Symbol

Conditions

Sub-

Limit

Limit

Units

See notes at end of table

Note 1/

group

Min

Max

Encode width high (short

encode)

See figure 3 2/

9,10,11

20

50

ns

Encode width Low (long

encode)

See figure 3 2/

9,10,11

20

DAV pulse width

See figure 3

9,10,11

150

300

Encode falling edge delay

See figure 3 2/

90

Start new conversion delay

See figure 3 2/

90

Data and QTR delay from DAV

falling edge

See figure 3 2/

9

20

Data and OTR delay from DAV

rising edge

See figure 3 2/

9

20