AD876JSTZ Datasheet AD876JSTZ, AD876JR, AD876JR-REEL | P4-P6

AD876

REV. B

–3–

DIGITAL SPECIFICATIONS

AD876

Parameter Symbol DRV

DD

Min Typ Max Units

LOGIC INPUT

High Level Input Voltage V

IH

3.0 2.4 V

5.0 4.0 V

5.25 4.2 V

Low Level Input Voltage V

IL

3.0 0.6 V

5.0 1.0 V

5.25 1.05 V

High Level Input Current I

IH

5.0 –10 +10 µA

Low Level Input Current I

IL

5.0 –50 +50 µA

Low Level Input Current (CLK Only) I

IL

5.0 –10 +10 µA

Input Capacitance C

IN

5pF

LOGIC OUTPUTS

High Level Output Voltage V

OH

(I

OH

= 50 µA) 3.0 2.4 V

5.0 3.8 V

(I

OH

= 0.5 mA) 5.0 2.4 V

Low Level Output Voltage V

OL

(I

OL

= 50 µA) 3.6 0.7 V

5.25 1.05 V

(I

OL

= 0.6 mA) 5.25 0.4 V

Output Capacitance C

OUT

5pF

Output Leakage Current I

OZ

–10 10 µA

Specifications subject to change without notice.

TIMING SPECIFICATIONS

Symbol Min Typ Max Units

Maximum Conversion Rate

1

20 MHz

Clock Period t

C

50 ns

Clock High t

CH

23 25 ns

Clock Low t

CL

23 25 ns

Output Delay t

OD

10 20 ns

Pipeline Delay (Latency) 3.5 Clock Cycles

Aperture Delay Time 4 ns

Aperture Jitter 22 ps

NOTE

1

Conversion 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

t

CL

t

CH

t

C

t

OD

Figure 1. Timing Diagram

(T

MIN

to T

MAX

with AV

DD

= +5.0 V, DV

DD

= +5.0 V, DRV

DD

= +3.3 V, V

REFT

= +4.0 V, V

REFB

= +2.0 V,

f

CLOCK

= 20 MSPS, C

L

= 20 pF unless otherwise noted)

REV. B–4–

AD876

SOIC TQFP

Symbol Pin No. Pin No. Type Name and Function

D0 (LSB) 3 1 DO Least Significant Bit.

D1–D4 4–7 2–5 DO Data Bits 1 through 4.

D5–D8 8–11 8–11 Data Bits 5 through 8.

D9 (MSB) 12 12 DO Most Significant Bit.

THREE- 16 23 DI

THREE-STATE = LOW THREE-STATE = HIGH

STATE

or N/C

Normal Operating Mode High Impedance Outputs

STBY 17 24 DI

STBY = LOW or N/C STBY = HIGH

Normal Operating Mode Standby Mode

CLK 15 22 DI Clock Input.

CML 26 38 AO Bypass Pin for an Internal Bias Point.

REFTF 22 30 AI Reference Top Force.

REFBF 24 34 AI Reference Bottom Force.

REFTS 21 29 AI Reference Top Sense.

REFBS 25 35 AI Reference Bottom Sense.

AIN 27 39 AI Analog Input.

AV

DD

28 42 P +5 V Analog Supply.

AV

SS

1 44 P Analog Ground.

DV

DD

18 26 P +5 V Digital Supply.

DV

SS

14, 19, 20 17, 27, 28 P Digital Ground.

DRV

DD

2 45 P +3.3 V/+5 V Digital Supply. Supply for digital

input and output buffers.

DRV

SS

13 16 P +3.3 V/+5 V Digital Ground. Ground for digital

input and output buffers.

Type: AI = Analog Input; AO = Analog Output; DI = Digital Input; DO = Digital Output; P = Power.

PIN CONFIGURATIONS

SOIC/SSOP TQFP

PIN FUNCTION DESCRIPTIONS

PINS D0 AND D1 ARE LEFT OPEN

FOR THE AD876JR-8

*

AV

SS

DRV

DD

AV

DD

AIN

D2

D3

D4

REFBF

REFTF

*D0

*D1

CML

REFBS

D5 REFTS

D6

DV

SS

D7

DV

SS

D8

DV

DD

D9 STBY

DRV

SS

THREE-STATE

DV

SS

CLK

13

18

1

2

28

27

5

6

7

24

23

22

3

4

26

25

8

21

9

20

10

19

11

12

17

16

14

15

TOP VIEW

(Not to Scale)

AD876

NC

NC = NO CONNECT

REFBS

REFTF

REFBF

D0

D1

D4

D5

D6

D2

D3

DV

SS

DV

DD

REFTS

D8

D9

D7

41

424347 4546

17 20191814 1615

36

35

32

31

30

34

33

44

1

2

5

6

7

3

4

373839

21 242322

40

28

27

26

29

9

10

11

8

48

13

25

12

TOP VIEW

(Not to Scale)

AD876

DRV

SS

DV

SS

CLK

THREE-STATE

STBY

DRV

DD

AV

SS

AV

DD

AIN

CML

DV

SS

AD876

REV. B

–5–

ORDERING GUIDE

Temperature Package Package

Model Range Description Options

AD876JR 0°C to +70°C 28-Lead SOIC R-28

AD876JST-Reel 0°C to +70°C 48-Lead TQFP ST-48

(Tape and Reel 13")

AD876JR-8 0°C to +70°C 28-Lead SOIC R-28

AD876AR –40°C to +85°C 28-Lead SOIC R-28

AD876ARS –40°C to +85°C 28-Lead SSOP RS-28

AD876JRS 0°C to +70°C 28-Lead SSOP RS-28

AD876JRS-8 0°C to +70°C 28-Lead SSOP RS-28

ABSOLUTE MAXIMUM RATINGS*

Parameter With Respect to Min Max Units

AV

DD

AV

SS

–0.5 +6.5 Volts

DV

DD

, DRV

DD

DV

SS

, DRV

SS

–0.5 +6.5 Volts

AV

SS

DV

SS

, DRV

SS

–0.5 +0.5 Volts

AIN AV

SS

–0.5 +6.5 Volts

REFTS, REFTF

REFBS, REFBF AV

SS

–0.5 +6.5 Volts

Digital Inputs, CLK DV

SS

, DRV

SS

–0.5 +6.5 Volts

Junction Temperature +150 °C

Storage Temperature –65 +150 °C

Lead Temperature

(10 sec) +300 °C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those indicated in the operational

sections of this specification is not implied. Exposure to absolute maximum

ratings for extended periods may effect device reliability.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD876 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

Figure 2. Equivalent Circuits

REFTF

REFTS

REFBS

REFBF

AV

DD

AV

SS

AV

DD

AV

SS

AV

DD

AV

SS

AV

DD

AV

SS

INTERNAL

REFERENCE

VOLTAGE

INTERNAL

REFERENCE

VOLTAGE

DRV

DD

DV

SS

DRV

SS

DV

SS

DV

DD

DRV

DD

DRV

SS

DV

SS

DV

DD

AV

DD

AV

SS

DRV

DD

DRV

SS

DV

SS

DV

DD

c) CLK

d) AIN

a) D0–D9 b) Three-State, Standby

WARNING!

ESD SENSITIVE DEVICE

AD876JSTZ

AD876JSTZ

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