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AD876

10-Bit 20 MSPS 160 mW CMOS A/D Converter

Analog Devices 

AD876

DIGITAL SPECIFICATIONS (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)

Parameter

Symbol

DRVDD Min

AD876

Typ

Max

Units

LOGIC INPUT

High Level Input Voltage

VIH

Low Level Input Voltage

VIL

High Level Input Current

IIH

Low Level Input Current

IIL

Low Level Input Current (CLK Only)

IIL

Input Capacitance

CIN

3.0

2.4

5.0

4.0

5.25

4.2

3.0

5.0

5.25

5.0

–10

5.0

–50

5.0

–10

5

V

V

V

0.6

V

1.0

V

1.05

V

+10

µA

+50

µA

+10

µA

pF

LOGIC OUTPUTS

High Level Output Voltage

(IOH = 50 µA)

(IOH = 0.5 mA)

Low Level Output Voltage

(IOL = 50 µA)

(IOL = 0.6 mA)

Output Capacitance

Output Leakage Current

VOH

VOL

COUT

IOZ

3.0

2.4

5.0

3.8

5.0

2.4

3.6

5.25

5.25

5

–10

V

V

V

0.7

V

1.05

V

0.4

V

pF

10

µA

Specifications subject to change without notice.

TIMING SPECIFICATIONS

Maximum Conversion Rate1

Clock Period

Clock High

Clock Low

Output Delay

Pipeline Delay (Latency)

Aperture Delay Time

Aperture Jitter

Symbol

tC

tCH

tCL

tOD

Min

Typ

Max

20

50

23

25

23

25

10

20

3.5

4

22

NOTE

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

Units

MHz

ns

ns

ns

ns

Clock Cycles

ns

ps

SAMPLE N SAMPLE N+1 SAMPLE N+2

AIN

tCH tCL

CLK

tC

t OD

OUT

DATA N-4 DATA N-3

DATA N-2 DATA N-1

DATA N

Figure 1. Timing Diagram

REV. B

–3–

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