a
FEATURES
Monolithic 10-Bit/60 MSPS Converter
TTL Outputs
Bipolar ( 1.75 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
ANALOG IN
8
9
OVERFLOW
+V
REF
12
+V
SENSE
11
R/2
512
10-Bit 60 MSPS
A/D Converter
AD9020
FUNCTIONAL BLOCK DIAGRAM
MSB LSBS
INVERT INVERT
61
59
R
385
C
R/2
3/4
REF
7
R/2
384
O
M
D
P
R
A
C
R
R
257
A
R/2
1/2
REF
1
T
E
R/2
R
O
L
R
129
R/2
1/4
REF
63
R/2
R
128
C
H
E
S
R
2
R
1
R/2
–V
SENSE
57
–V
REF
56
ENCODE 14
G
A
I
T
C
H
O
256
R
1024
L
10
C
T
OVERFLOW
O
L
D
OVERFLOW
A
E
51 OVERFLOW
50 D
9
(MSB)
49 D
8
48 D
7
47 D
6
46 D
5
23 D
4
22 D
3
21 D
2
20 D
1
19 D
0
(LSB)
GENERAL DESCRIPTION
The AD9020 A/D converter is a 10-bit monolithic converter
capable of word rates of 60 MSPS and above. Innovative archi-
tecture using 512 input comparators instead of the traditional
1024 required by other flash converters reduces input capaci-
tance 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
SENSE
.
Voltage sense lines are provided to insure accurate driving of the
±
V
REF
voltages applied to the units. Quarter-point taps on the
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 Prod-
ucts Databook or current AD9020/883B data sheet for detailed
specifications.
–V
S
+V
S
GROUND
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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
AD9020–SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
1
+V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 V
–V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –6 V
ANALOG IN . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V to +2 V
+V
REF
, –V
REF
, 3/4
REF
, 1/2
REF
, 1/4
REF
. . . . . . . . . . –2 V to +2 V
+V
REF
to –V
REF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 V
DIGITAL INPUTS . . . . . . . . . . . . . . . . . . . . . . .–0.5 V to +V
S
3/4
REF
, 1/2
REF
, 1/4
REF
Current . . . . . . . . . . . . . . . . . . .
±
10 mA
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
2
. . . . . . . . . . . . . . . . +175°C
Lead Soldering Temp (10 sec) . . . . . . . . . . . . . . . . . . . +300°C
ELECTRICAL CHARACTERISTICS
(
Parameter (Conditions)
RESOLUTION
DC ACCURACY
Differential Nonlinearity
Integral Nonlinearity
No Missing Codes
ANALOG INPUT
Input Bias Current
4
Input Resistance
Input Capacitance
4
Analog Bandwidth
REFERENCE INPUT
Reference Ladder Resistance
Ladder Tempco
Reference Ladder Offset
Top of Ladder
Bottom of Ladder
Offset Drift Coefficient
SWITCHING PERFORMANCE
Conversion Rate
Aperture Delay (t
A
)
Aperture Uncertainty (Jitter)
Output Delay (t
OD
)
5
Output Time Skew
5
DYNAMIC PERFORMANCE
Transient Response
Overvoltage Recovery Time
Effective Number of Bits (ENOB)
f
IN
= 2.3 MHz
f
IN
= 10.3 MHz
f
IN
= 15.3 MHz
Signal-to-Noise Ratio
6
f
IN
= 2.3 MHz
f
IN
= 10.3 MHz
f
IN
= 15.3 MHz
Signal-to-Noise Ratio
6
(Without Harmonics)
f
IN
= 2.3 MHz
f
IN
= 10.3 MHz
f
IN
= 15.3 MHz
3
V
S
=
Test
Level
5 V;
V
SENSE
=
1.75 V; ENCODE = 40 MSPS unless otherwise noted)
AD9020KE/KZ
Min
Typ
Max
10
1.0
1.25
1.25
1.5
2.0
2.5
0.75
1.0
1.25
1.0
1.5
2.0
Guaranteed
0.4
2.0
7.0
45
175
37
0.1
90
90
90
90
45
45
50
60
1
5
10
3
10
10
1
5
10
3
10
10
8.6
8.0
7.5
54
50
47
9.0
8.4
8.0
56
53
50
90
90
90
90
56
66
1.0
2.0
Units
Bits
LSB
LSB
LSB
LSB
Temp
AD9020JE/JZ
Min
Typ
Max
10
+25°C
Full
+25°C
Full
Full
+25°C
Full
+25°C
+25°C
+25°C
+25°C
Full
Full
+25°C
Full
+25°C
Full
Full
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
I
VI
I
VI
VI
I
VI
I
V
V
I
VI
V
I
VI
I
VI
V
I
V
V
I
I
V
V
I
IV
IV
I
I
I
8.6
8.0
7.5
54
50
47
60
0.4
2.0
7.0
45
175
37
0.1
45
45
50
1.0
2.0
mA
mA
kΩ
pF
MHz
Ω
Ω
Ω/°C
mV
mV
mV
mV
µV/°C
MSPS
ns
ps, rms
ns
ns
ns
ns
Bits
Bits
Bits
dB
dB
dB
22
14
56
66
22
14
6
13
5
6
13
5
9.0
8.4
8.0
56
53
50
+25°C
+25°C
+25°C
I
I
I
54
51
48
56
54
52
54
51
48
56
54
52
dB
dB
dB
–2–
REV. A
AD9020
Parameter (Conditions)
Temp
Test
Level
AD9020JE/JZ
Min
Typ
Max
AD9020KE/KZ
Min
Typ
Max
Units
DYNAMIC PERFORMANCE
(continued)
Harmonic Distortion
+25°C
f
IN
= 2.3 MHz
+25°C
f
IN
= 10.3 MHz
+25°C
f
IN
= 15.3 MHz
Two-Tone Intermodulation
+25°C
Distortion Rejection
7
Differential Phase
+25°C
Differential Gain
+25°C
ENCODE INPUT
Logic “1” Voltage
Logic “0” Voltage
Logic “1” Current
Logic “0” Current
Input Capacitance
Pulse Width (High)
Pulse Width (Low)
DIGITAL OUTPUTS
Logic “1” Voltage (I
OH
= 2 mA)
Logic “0” Voltage (I
OL
= 6 mA)
POWER SUPPLY
+V
S
Supply Current
–V
S
Supply Current
Power Dissipation
Power Supply Rejection
Ratio (PSRR)
8
Full
Full
Full
Full
+25°C
+25°C
+25°C
Full
Full
+25°C
Full
+25°C
Full
+25°C
Full
Full
I
I
I
V
V
V
VI
VI
VI
VI
V
I
I
VI
VI
I
VI
I
VI
I
VI
VI
61
55
49
67
59
53
70
0.5
1
61
55
49
67
59
53
70
0.5
1
dBc
dBc
dBc
dBc
Degree
%
V
V
µA
µA
pF
ns
ns
V
V
2.0
0.8
20
800
5
6
6
2.4
0.4
440
140
2.8
530
542
170
177
3.3
3.4
10
2.0
0.8
20
800
5
6
6
2.4
440
140
2.8
530
542
170
177
3.3
3.4
10
mA
mA
mA
mA
W
W
mV/V
6
6
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:
θ
JC
= 1°C/W;
θ
JA
= 17°C/W (no air flow);
θ
JA
= 15°C/W
(air flow = 500 LFM). 68-pin ceramic LCC:
θ
JC
= 2.6°C/W;
θ
JA
= 15°C/W (no air flow);
θ
JA
= 13°C/W (air flow = 500 LFM).
3
3/4
REF
, 1/2
REF
, and 1/4
REF
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
tested and not included in linearity specifications.
4
Measured with ANALOG IN = +V
SENSE
.
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 D
0
–D
9
. Output skew
measured as worst-case difference in output delay among D
0
–D
9
.
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
S
or –V
S
.
Specifications subject to change without notice.
REV. A
–3–
AD9020
EXPLANATION OF TEST LEVELS
ORDERING GUIDE
Device
AD9020JZ
AD9020JE
AD9020KZ
AD9020KE
AD9020SZ/883
AD9020SE/883
AD9020TZ/883
AD9020TE/883
AD9020/PCB
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
0°C to +70°C
Description
68-Pin Leaded Ceramic
68-Terminal Ceramic LCC
68-Pin Leaded Ceramic
68-Terminal Ceramic LCC
68-Pin Leaded Ceramic
68-Terminal Ceramic LCC
68-Pin Leaded Ceramic
68-Terminal Ceramic LCC
Evaluation Board
Package
Option*
Z-68
E-68A
Z-68
E-68A
Z-68
E-68A
Z-68
E-68A
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.
*E = Ceramic Leadless Chip Carrier; Z = Ceramic Leaded Chip Carrier.
DIE LAYOUT AND MECHANICAL INFORMATION
+ 5.0V
0.1
µF
3,6,15,18,25,30,33,34,
37,40,45,52,55,65,68
100Ω
AD1
510Ω
AD2
+2V
–2V
14 ENCODE
D
5
– D
9
12 +V
REF
56
_
V
REF
GROUND
–V
S
4,5,13,17,
27,31,32,
36,38,39,
43,53,66,67
46
51
510Ω
8
9
ANALOG IN
+V
S
D
0
– D
4
19
23
Die Dimensions . . . . . . . . . . . . . . . 206 140 15 (± 2) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –V
S
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nitride
510Ω
AD9020
59 LSBs INVERT
61 MSB INVERT
2,16,28,29,35,
41,42,54,64
STATIC: AD1 = –2V; AD2 = +2.4V
DYNAMIC: AD1 =
±2V
TRIANGLE WAVE
AD2 = TTL PULSE TRAIN
0.1µF
–
5.2V
AD9020 Burn-In Circuit
–4–
REV. A
AD9020
ANALOG IN
ANALOG IN
3/4
REF
+V
S
GND
GND
+V
S
–V
S
1/2
REF
+V
S
GND
GND
+V
S
–V
S
1/4
REF
NC
MSB INVERT
9
+V
SENSE
NC
10
61
60
+V
REF
GND
ENCODE
+V
S
–V
S
GND
+V
S
(LSB) D
0
D
1
D
2
D
3
D
4
NC
+V
S
NC
AD9020
TOP VIEW
(Not to Scale)
26
27
44
43
NC
LSBs INVERT
NC
–V
SENSE
–V
REF
+V
S
–V
S
GND
+V
S
OVERFLOW
D
9
(MSB)
D
8
D
7
D
6
D
5
+V
S
NC
GND
–V
S
–V
S
+V
S
GND
GND
+V
S
+V
S
–V
S
GND
+V
S
GND
GND
+V
S
–V
S
–V
S
GND
NC = NO CONNECT
AD9020 PIN FUNCTION DESCRIPTIONS
Pin No.
1
2, 16, 28, 29, 35, 41, 42,
54, 64
3, 6, 15, 18, 25, 30, 33, 34,
37, 40, 45, 52, 55, 65, 68
4, 5, 13, 17, 27, 31, 32,
36, 38, 39, 43, 53, 66, 67
7
8, 9
11
12
14
19–23, 46–50
51
56
57
59
61
63
REV. A
Name
1/2
REF
–V
S
+V
S
GROUND
3/4
REF
ANALOG IN
+V
SENSE
+V
REF
ENCODE
D
0
–D
9
OVERFLOW
–V
REF
–V
SENSE
LSBs INVERT
MSB INVERT
1/4
REF
Function
Midpoint of internal reference ladder.
Negative supply voltage; nominally –5.0 V
±
5%.
Positive supply voltage; nominally +5 V
±
5%.
All ground pins should be connected together and to low impedance ground
plane.
Three-quarter point of internal reference ladder.
Analog input; nominally between
±
1.75 V.
Voltage sense line to most positive point on internal resistor ladder.
Normally +1.75 V.
Voltage force connection for top of internal reference ladder. Normally driven
to provide +1.75 V at +V
SENSE
.
TTL-compatible convert command used to begin digitizing process.
TTL-compatible digital output data.
TTL-compatible output indicating ANALOG IN > +V
SENSE
.
Voltage force connection for bottom of internal reference ladder. Normally
driven to provide –1.75 V at –V
SENSE
.
Voltage sense line to most negative point on internal resistor ladder.
Normally –1.75 V.
Normally grounded. When connected to +V
S
, lower order bits (D
0
–D
8
) are
inverted.
Normally grounded. When connected to +V
S
, most significant bit (MSB; D
9
)
is inverted.
One-quarter point of internal reference ladder.
–5–
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