AD876_17 datasheet(4/17 Pages) AD

Nome de Peças	AD876

Descrição Electrónicos	CMOS A/D Converter

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Fabricante Electrônico	AD [Analog Devices]

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AD876

REV. B

–3–

DIGITAL SPECIFICATIONS

AD876

Parameter

Symbol

DRVDD

Min

Typ

Max

Units

LOGIC INPUT

High Level Input Voltage

VIH

3.0

2.4

V

5.0

4.0

V

5.25

4.2

V

Low Level Input Voltage

VIL

3.0

0.6

V

5.0

1.0

V

5.25

1.05

V

High Level Input Current

IIH

5.0

–10

+10

µA

Low Level Input Current

IIL

5.0

–50

+50

µA

Low Level Input Current (CLK Only)

IIL

5.0

–10

+10

µA

Input Capacitance

CIN

5pF

LOGIC OUTPUTS

High Level Output Voltage

VOH

(IOH = 50

µA)

3.0

2.4

V

5.0

3.8

V

(IOH = 0.5 mA)

5.0

2.4

V

Low Level Output Voltage

VOL

(IOL = 50

µA)

3.6

0.7

V

5.25

1.05

V

(IOL = 0.6 mA)

5.25

0.4

V

Output Capacitance

COUT

5pF

Output Leakage Current

IOZ

–10

10

µA

Specifications subject to change without notice.

TIMING SPECIFICATIONS

Symbol

Min

Typ

Max

Units

Maximum Conversion Rate1

20

MHz

Clock Period

tC

50

ns

Clock High

tCH

23

25

ns

Clock Low

tCL

23

25

ns

Output Delay

tOD

10

20

ns

Pipeline Delay (Latency)

3.5

Clock Cycles

Aperture Delay Time

4

ns

Aperture Jitter

22

ps

NOTE

1Conversion rate is operational down to 10 kHz without degradation in specified performance.

OUT

DATA N-4

DATA N-3

DATA N-2

DATA N-1

DATA N

SAMPLE N

SAMPLE N+1

SAMPLE N+2

AIN

CLK

tCL

tCH

tC

tOD

Figure 1. Timing Diagram

(TMIN to TMAX with AVDD = +5.0 V, DVDD = +5.0 V, DRVDD = +3.3 V, VREFT = +4.0 V, VREFB = +2.0 V,

fCLOCK = 20 MSPS, CL = 20 pF unless otherwise noted)

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