Analog Devices AD9020 Datasheet

10-Bit 60 MSPS

a

FEATURES
Monolithic 10-Bit/60 MSPS Converter
TTL Outputs
Bipolar (61.75 V) Analog Input
56 dB SNR @ 2.3 MHz Input
Low (45 pF) Input Capacitance
MIL-STD-883 Compliant Versions Available

APPLICATIONS
Digital Oscilloscopes
Medical Imaging
Professional Video
Radar Warning/Guidance Systems
Infrared Systems

GENERAL DESCRIPTION

The AD9020 A/D converter is a 10-bit monolithic converter
capable of word rates of 60 MSPS and above. Innovative archi­tecture using 512 input comparators instead of the traditional
1024 required by other flash converters reduces input capaci­tance and improves linearity.

Encode and outputs are TTL-compatible, making the AD9020
an ideal candidate for use in low power systems. An overflow
bit is provided to indicate analog input signals greater than
+V

Voltage sense lines are provided to insure accurate driving of the
±V
resistor ladder help optimize the integral linearity of the unit.

Either 68-pin ceramic leaded (gull wing) packages or ceramic
LCCs are available and are specifically designed for low thermal
impedances. Two performance grades for temperatures of both
0°C to +70°C and –55°C to +125°C ranges are offered to allow
the user to select the linearity best suited for each application.
Dynamic performance is fully characterized and production
tested at +25°C. MIL-STD-883 units are available.

The AD9020 A/D Converter is available in versions compliant
with MIL-STD-883. Refer to the Analog Devices Military Prod­ucts Databook or current AD9020/883B data sheet for detailed
specifications.

.

SENSE

voltages applied to the units. Quarter-point taps on the

REF

ANALOG IN

+V

+V

SENSE

3/4

1/2

1/4

–V

SENSE

–V

ENCODE

A/D Converter

FUNCTIONAL BLOCK DIAGRAM

8
9

12

REF

11

R/2

R

R/2

7

REF

R/2

R

R

R/2

1

REF

R/2

R

R

R/2

63

REF

R/2

R

R

R

R/2

57
56

REF

14

512

385

384

257

256

129

128

2

1

OVERFLOW

C

O

M

P

A

R

A

OVERFLOW OVERFLOW

T

O

1024 10

R

L

A

T

C

H

E

S

–V

AD9020

INVERT

D

E

C

O

D

E

L

O

G

I

C

+V

S

S

MSB

GROUND

LSBS
INVERT

5961

L

A

T

C

H

OVERFLOW

51

D

50

D

49

48

D

D

47

46

D

23

D

22

D

21

D

20

D

19

D

(MSB)

9

8

7

6

5

4

3

2

1

(LSB)

0

REV. A

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A
.Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1997

AD9020–SPECIFICA TIONS

ABSOLUTE MAXIMUM RATINGS

+VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 V

–V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–6 V

S

ANALOG IN . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V to +2 V

+V

, –V

, 3/4

+V

REF
REF

REF

to –V

, 1/2

REF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 V

REF

REF

, 1/4

DIGITAL INPUTS . . . . . . . . . . . . . . . . . . . . . . .–0.5 V to +V

ELECTRICAL CHARACTERISTICS

1

. . . . . . . . . . –2 V to +2 V

REF

(6VS = 65 V; 6V

3/4

, 1/2

, 1/4

REF

REF

Current . . . . . . . . . . . . . . . . . . . ±10 mA

REF

Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Operating Temperature

AD9020JE/KE/JZ/KZ . . . . . . . . . . . . . . . . . . 0°C to +70°C

Storage Temperature . . . . . . . . . . . . . . . . . . .–65°C to +150°C

Maximum Junction Temperature

Lead Soldering Temp (10 sec) . . . . . . . . . . . . . . . . . . . +300°C

S

= 61.75 V; ENCODE = 40 MSPS unless otherwise noted)

SENSE

2

. . . . . . . . . . . . . . . . +175°C

Test AD9020JE/JZ AD9020KE/KZ

Parameter (Conditions) Temp Level Min Typ Max Min Typ Max Units

RESOLUTION 10 10 Bits
DC ACCURACY

3

Differential Nonlinearity +25°C I 1.0 1.25 0.75 1.0 LSB

Full VI 1.5 1.25 LSB

Integral Nonlinearity +25°C I 1.25 2.0 1.0 1.5 LSB

Full VI 2.5 2.0 LSB

No Missing Codes Full VI Guaranteed

ANALOG INPUT

Input Bias Current

4

+25°C I 0.4 1.0 0.4 1.0 mA

Full VI 2.0 2.0 mA
Input Resistance +25°C I 2.0 7.0 2.0 7.0 kΩ
Input Capacitance

4

+25°C V 45 45 pF
Analog Bandwidth +25°C V 175 175 MHz

REFERENCE INPUT

Reference Ladder Resistance +25°C I 22 37 56 22 37 56 Ω

Full VI 14 66 14 66 Ω
Ladder Tempco Full V 0.1 0.1 Ω/°C
Reference Ladder Offset

Top of Ladder +25°C I 45 90 45 90 mV

Full VI 90 90 mV

Bottom of Ladder +25°C I 45 90 45 90 mV

Full VI 90 90 mV
Offset Drift Coefficient Full V 50 50 µV/°C

SWITCHING PERFORMANCE

Conversion Rate +25°C I 60 60 MSPS
Aperture Delay (t
Aperture Uncertainty (Jitter) +25°C V 5 5 ps, rms
Output Delay (t
Output Time Skew

) +25°CV 1 1 ns

A

5

OD

)

5

+25°C I 6 10 13 6 10 13 ns

+25°CI 35 35 ns

DYNAMIC PERFORMANCE

Transient Response +25°C V 10 10 ns
Overvoltage Recovery Time +25°C V 10 10 ns
Effective Number of Bits (ENOB)

f

= 2.3 MHz +25°C I 8.6 9.0 8.6 9.0 Bits

IN

f

= 10.3 MHz +25°C IV 8.0 8.4 8.0 8.4 Bits

IN

f

= 15.3 MHz +25°C IV 7.5 8.0 7.5 8.0 Bits

IN

Signal-to-Noise Ratio

6

fIN = 2.3 MHz +25°C I 54 56 54 56 dB
f

= 10.3 MHz +25°C I 50 53 50 53 dB

IN

f

= 15.3 MHz +25°C I 47 50 47 50 dB

IN

Signal-to-Noise Ratio

6

(Without Harmonics)
f

= 2.3 MHz +25°C I 54 56 54 56 dB

IN

f

= 10.3 MHz +25°C I 51 54 51 54 dB

IN

fIN = 15.3 MHz +25°C I 48 52 48 52 dB

–2–

REV. A

AD9020

Test AD9020JE/JZ AD9020KE/KZ

Parameter (Conditions) Temp Level Min Typ Max Min Typ Max Units

DYNAMIC PERFORMANCE (continued)

Harmonic Distortion

= 2.3 MHz +25°C I 61 67 61 67 dBc

f

IN

= 10.3 MHz +25°C I 55 59 55 59 dBc

f

IN

= 15.3 MHz +25°C I 49 53 49 53 dBc

f

IN

Two-Tone Intermodulation

Distortion Rejection
Differential Phase +25°C V 0.5 0.5 Degree
Differential Gain +25°CV 1 1 %

ENCODE INPUT

Logic “1” Voltage Full VI 2.0 2.0 V
Logic “0” Voltage Full VI 0.8 0.8 V
Logic “1” Current Full VI 20 20 µA
Logic “0” Current Full VI 800 800 µA
Input Capacitance +25°CV 5 5 pF
Pulse Width (High) +25°CI66ns
Pulse Width (Low) +25°CI66ns

DIGITAL OUTPUTS

Logic “1” Voltage (I
Logic “0” Voltage (IOL = 6 mA) Full VI 0.4 V

POWER SUPPLY

+V

Supply Current +25°C I 440 530 440 530 mA

S

–V

Supply Current +25°C I 140 170 140 170 mA

S

Power Dissipation +25°C I 2.8 3.3 2.8 3.3 W
Power Supply Rejection

Ratio (PSRR)

NOTES

1

Absolute maximum ratings are limiting values to be applied individually, and beyond which the service ability of the circuit may be impaired. Functional operability is
not necessarily implied. Exposure to absolute maximum rating conditions for an extended period of time may affect device reliability.

2

Typical thermal impedances (part soldered onto board): 68-pin leaded ceramic chip carrier: θJC = 1°C/W; θJA = 17°C/W (no air flow); θJA = 15°C/W
(air flow = 500 LFM). 68-pin ceramic LCC: θJC = 2.6°C/W; θJA = 15°C/W (no air flow); θJA = 13°C/W (air flow = 500 LFM).

3

3/4

, 1/2

REF

tested and not included in linearity specifications.

4

Measured with ANALOG IN = +V

5

Output delay measured as worst-case time from 50% point of the rising edge of ENCODE to 50% point of the slowest rising or falling edge of D0–D9. Output skew
measured as worst-case difference in output delay among D0–D9.

6

RMS signal to rms noise with analog input signal 1 dB below full scale at specified frequency.

7

Intermodulation measured with analog input frequencies of 2.3 MHz and 3.0 MHz at 7 dB below full scale.

8

Measured as the ratio of the worst-case change in transition voltage of a single comparator for a 5% change in +V

Specifications subject to change without notice.

, and 1/4

REF

7

= 2 mA) Full VI 2.4 2.4 V

OH

+25°C V 70 70 dBc

Full VI 542 542 mA
Full VI 177 177 mA
Full VI 3.4 3.4 W

8

reference ladder taps are driven from dc sources at +0.875 V, 0 V, and –0.875 V, respectively. Accuracy of the overflow comparator is not

REF

SENSE

Full VI 6 10 6 10 mV/V

.

or –VS.

S

REV. A

–3–

AD9020

AD9020

4,5,13,17,

27,31,32,
36,38,39,

43,53,66,67

100Ω

510Ω

ANALOG IN

ENCODE

GROUND

2,16,28,29,35,

41,42,54,64

0.1µF

0.1 µF

510Ω

510Ω

AD1

AD2

3,6,15,18,25,30,33,34,

37,40,45,52,55,65,68

STATIC:

DYNAMIC:

AD1 = –2V; AD2 = +2.4V
AD1 = ±2V TRIANGLE WAVE
AD2 = TTL PULSE TRAIN

9

46

19

14

23

51

12

8

56

59

61

+2V

–2V

REF

V

+

REF

V

_

S

–

V

D

59

– D

D

04

– D

S

+

V

5.0V

+

5.2V

–

LSBs INVERT
MSB INVERT

EXPLANATION OF TEST LEVELS

Test Level
I – 100% production tested.
II – 100% production tested at +25°C, and sample tested at

specified temperatures.
III – Sample tested only.
IV – Parameter is guaranteed by design and characterization

testing.
V – Parameter is a typical value only.
VI – All devices are 100% production tested at +25°C. 100%

production tested at temperature extremes for extended

temperature devices; sample tested at temperature ex-

tremes for commercial/industrial devices.

DIE LAYOUT AND MECHANICAL INFORMATION

Die Dimensions . . . . . . . . . . . . . . . 206 3 140 3 15 (±2) mils

Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3 4 mils

Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Gold

Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None

Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –V

S

Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nitride

ORDERING GUIDE

Temperature Package

Device Range Description Option*

AD9020JZ 0°C to +70°C 68-Pin Leaded Ceramic Z-68
AD9020JE 0°C to +70°C 68-Terminal Ceramic LCC E-68A
AD9020KZ 0°C to +70°C 68-Pin Leaded Ceramic Z-68
AD9020KE 0°C to +70°C 68-Terminal Ceramic LCC E-68A
AD9020SZ/883 –55°C to +125°C 68-Pin Leaded Ceramic Z-68
AD9020SE/883 –55°C to +125°C 68-Terminal Ceramic LCC E-68A
AD9020TZ/883 –55°C to +125°C 68-Pin Leaded Ceramic Z-68
AD9020TE/883 –55°C to +125°C 68-Terminal Ceramic LCC E-68A
AD9020/PCB 0°C to +70°C Evaluation Board

*E = Ceramic Leadless Chip Carrier; Z = Ceramic Leaded Chip Carrier.

–4–

AD9020 Burn-In Circuit

REV. A