AD1671-703D 查看數據表（PDF） - Analog Devices

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AD1671-703D

12-Bit A/D Converter

Analog Devices 

Table I (Continued)

AD1671

Parameter

See notes at end of table

Encode width high (short

encode)

Encode width Low (long

encode)

DAV pulse width

Encode falling edge delay

Start new conversion delay

Data and QTR delay from DAV

falling edge

Data and OTR delay from DAV

rising edge

Symbol

tENC

Conditions

Note 1/

See figure 3 2/

tENCL

See figure 3 2/

tDAV

See figure 3

tF

See figure 3 2/

tR

See figure 3 2/

tDD

See figure 3 2/

tSS

See figure 3 2/

Sub-

group

9,10,11

9,10,11

9,10,11

9

9

9

9

TABLE I NOTES:

1/ VCC = +5V, VEE = -5V, VLOGIC = +5V, unless otherwise specified.

2/ This parameter is guaranteed, but not necessarily tested.

3/ RIN values are typical values only.

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

4/ 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

Limit

Min

20

20

150

0

0

20

20

Limit

Max

50

300

Units

ns

Encode Pulse High

Figure 3.Timing Diagrams

ASD0010777 Rev. M | Page 4 of 7

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