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FEATURES
8-Bit, 50, 80, and 100 MSPS ADC
Low Power: 90 mW at 100 MSPS
On-Chip Reference and Track/Hold
475 MHz Analog Bandwidth
SNR = 46.5 dB @ 41 MHz at 100 MSPS
1 V p-p Analog Input Range
Single 3.0 V Supply Operation (2.7 V–3.6 V)
Power-Down Mode: 4.2 mW
APPLICATIONS
Battery Powered Instruments
Hand-Held Scopemeters
Low Cost Digital Oscilloscopes
8-Bit, 50 MSPS/80 MSPS/100 MSPS
3 V A/D Converter
AD9283
FUNCTIONAL BLOCK DIAGRAM
V
D
PWRDWN
V
DD
AD9283
A
IN
A
IN
ENCODE
TIMING
REF
T/H
ADC
OUTPUT
STAGING
8
D7–D0
GND
REF REF
OUT IN
GENERAL DESCRIPTION
The AD9283 is an 8-bit monolithic sampling analog-to-digital
converter with an on-chip track-and-hold circuit and is opti-
mized for low cost, low power, small size and ease of use. The
product operates at a 100 MSPS conversion rate, with outstand-
ing dynamic performance over its full operating range.
The ADC requires only a single 3.0 V (2.7 V to 3.6 V) power
supply and an encode clock for full performance operation. No
external reference or driver components are required for many
applications. The digital outputs are TTL/CMOS compatible
and a separate output power supply pin supports interfacing
with 3.3 V or 2.5 V logic.
The encoder input is TTL/CMOS compatible. A power-down
function may be exercised to bring total consumption to
4.2 mW. In power-down mode, the digital outputs are driven
to a high impedance state.
Fabricated on an advanced CMOS process, the AD9283 is
available in a 20-lead surface mount plastic package (SSOP)
specified over the industrial temperature range (–40°C to +85°C).
REV. C
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
AD9283–SPECIFICATIONS
(V
Parameter
RESOLUTION
DC ACCURACY
Differential Nonlinearity
Integral Nonlinearity
No Missing Codes
Gain Error
1
Gain Tempco
1
ANALOG INPUT
Input Voltage Range
(With Respect to A
IN
)
Common-Mode Voltage
Input Offset Voltage
Reference Voltage
Reference Tempco
Input Resistance
Input Capacitance
Analog Bandwidth, Full Power
SWITCHING PERFORMANCE
Maximum Conversion Rate
Minimum Conversion Rate
Encode Pulsewidth High (t
EH
)
Encode Pulsewidth Low (t
EL
)
Aperture Delay (t
A
)
Aperture Uncertainty (Jitter)
Output Valid Time (t
V
)
2
Output Propagation Delay (t
PD
)
2
DIGITAL INPUTS
Logic “1” Voltage
Logic “0” Voltage
Logic “1” Current
Logic “0” Current
Input Capacitance
DIGITAL OUTPUTS
Logic “1” Voltage
Logic “0” Voltage
Output Coding
POWER SUPPLY
Power Dissipation
3, 4
Power-Down Dissipation
Power Supply Rejection Ratio
(PSRR)
25°C
Full
25°C
Full
Full
25°C
Full
Full
I
VI
I
VI
VI
I
VI
VI
Temp
Test
Level
DD
= 3.0 V, V
D
= 3.0 V; single-ended input; external
reference, unless otherwise noted)
AD9283BRS-50
Min
Typ
Max
8
Unit
Bits
+1.25
+1.50
+1.25
+1.50
+6
+8
LSB
LSB
LSB
LSB
% FS
% FS
ppm/°C
AD9283BRS-100
Min
Typ
Max
8
±
0.5
–1.25
±
0.75
+1.25
+1.50
+1.25
+2.25
+6
+8
AD9283BRS-80
Min
Typ
Max
8
±
0.5
–1.25
±
0.75
+1.25
+1.50
+1.25
+1.50
+6
+8
±
0.5
–1.25
±
0.75
Guaranteed
–6
±
2.5
–8
80
–6
–8
Guaranteed
±
2.5
80
–6
–8
Guaranteed
±
2.5
80
Full
Full
25°C
Full
Full
Full
25°C
Full
25°C
Full
25°C
Full
25°C
25°C
25°C
25°C
25°C
Full
Full
Full
Full
Full
Full
25°C
Full
Full
V
V
I
VI
VI
VI
I
VI
V
VI
V
VI
IV
IV
IV
V
V
VI
VI
VI
VI
VI
VI
V
VI
VI
–35
1.2
7
5
±
512
±
200
±
10
±
40
1.25
±
130
10
2
475
+35
1.3
13
16
–35
1.2
7
5
±
512
±
200
±
10
±
40
1.25
±
130
10
2
475
+35
1.3
13
16
–35
1.2
7
5
±
512
±
200
±
10
±
40
1.25
±
130
10
2
475
+35
1.3
13
16
mV p-p
mV
mV
mV
V
ppm/°C
kΩ
kΩ
pF
µA
MHz
MSPS
MSPS
ns
ns
ns
ps rms
ns
ns
V
V
µA
µA
pF
V
V
100
4.3
4.3
0
5
3.0
4.5
1
1000
1000
80
5.0
5.0
0
5
3.0
4.5
1
1000
1000
50
8.0
8.0
0
5
3.0
4.5
1
1000
1000
2.0
2.0
7.0
2.0
0.8
±
1
±
1
2.0
7.0
2.0
0.8
±
1
±
1
7.0
2.0
0.8
±
1
±
1
2.0
2.95
0.05
Offset Binary Code
80
4.2
100
7
18
2.0
2.95
0.05
Offset Binary Code
90
4.2
120
7
18
2.95
2.0
0.05
Offset Binary Code
90
4.2
115
7
18
Full
Full
25°C
VI
VI
I
mW
mW
mV/V
–2–
REV. C
AD9283
Parameter
DYNAMIC PERFORMANCE
5
Transient Response
Overvoltage Recovery Time
Signal-to-Noise Ratio (SNR)
(Without Harmonics)
f
IN
= 10.3 MHz
f
IN
= 27 MHz
f
IN
= 41 MHz
f
IN
= 76 MHz
Signal-to-Noise Ratio (SINAD)
(With Harmonics)
f
IN
= 10.3 MHz
f
IN
= 27 MHz
f
IN
= 41 MHz
f
IN
= 76 MHz
Effective Number of Bits
f
IN
= 10.3 MHz
f
IN
= 27 MHz
f
IN
= 41 MHz
f
IN
= 76 MHz
2nd Harmonic Distortion
f
IN
= 10.3 MHz
f
IN
= 27 MHz
f
IN
= 41 MHz
f
IN
= 76 MHz
3rd Harmonic Distortion
f
IN
= 10.3 MHz
f
IN
= 27 MHz
f
IN
= 41 MHz
f
IN
= 76 MHz
Two-Tone Intermod Distortion
(IMD)
f
IN
= 10.3 MHz
Temp
25°C
25°C
Test
Level
V
V
AD9283BRS-100
Min Typ Max
2
2
AD9283BRS-80
Min Typ Max
2
2
AD9283BRS-50
Min Typ Max
2
2
Unit
ns
ns
25°C
25°C
25°C
25°C
I
I
I
V
46.5
46.5
43.5 46.5
46.0
44
47
47
47
44
47
47
dB
dB
dB
dB
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
25°C
25°C
25°C
I
I
I
V
I
I
I
V
I
I
I
V
I
I
I
V
45
45.5
42.5 45
42.5
7.3
7.4
7.3
6.9
57
60
58
46
54.5
55
52.5
53
47
43.5 46.5
42
43.5 46.5
46
dB
dB
dB
dB
Bits
Bits
Bits
Bits
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
7.5
7.5
7.5
7.6
7.5
55
50
60
60
55
55
60
56
55
47
70
62.5
60
55
70
60
25°C
V
52
52
52
dBc
NOTES
1
Gain error and gain temperature coefficient are based on the ADC only (with a fixed 1.25 V external reference).
2
t
V
and t
PD
are measured from the 1.5 V level of the ENCODE input to the 50%/50% levels of the digital outputs swing. The digital output load during test is not to
exceed an ac load of 10 pF or a dc current of
±
40
µA.
3
Power dissipation measured with encode at rated speed and a dc analog input.
4
Typical thermal impedance for the RS style (SSOP) 20-lead package:
θ
JC
= 46°C/W,
θ
CA
= 80°C/W,
θ
JA
= 126°C/W.
5
SNR/harmonics based on an analog input voltage of –0.7 dBFS referenced to a 1.024 V full-scale input range.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*
V
D
, V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . –0.5 V to V
D
+ 0.5 V
Digital Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to V
DD
+ 0.5 V
VREF IN . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
D
+ 0.5 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . 150°C
Maximum Case Temperature . . . . . . . . . . . . . . . . . . . 150°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 outside of those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods may affect device reliability.
ORDERING GUIDE
Model
Temperature
Ranges
Package
Descriptions
Package
Options
AD9283BRS
-50, -80, -100 –40°C to +85°C 20-Lead SSOP
RS-20
AD9283/PCB 25°C
Evaluation Board
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 AD9283 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.
WARNING!
ESD SENSITIVE DEVICE
REV. C
–3–
AD9283
EXPLANATION OF TEST LEVELS
Table I. Output Coding (VREF = 1.25 V)
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 characteriza-
tion testing.
V Parameter is a typical value only.
VI 100% production tested at 25°C; guaranteed by design and
characterization testing for industrial temperature range;
100% production tested at temperature extremes for mili-
tary devices.
Step
255
•
•
128
127
•
•
0
A
IN
–A
IN
0.512
•
•
0.002
–0.002
•
•
–0.512
Digital Output
1111 1111
•
•
1000 0000
0111 1111
•
•
0000 0000
PIN CONFIGURATION
D0 (LSB)
D1
D2
D3
GND
PWRDWN
1
VREF OUT
2
VREF IN
3
GND
4
V
D 5
A
IN 6
20
19
18
17
AD9283
16
TOP VIEW
15
V
DD
(Not to Scale)
14
D4
A
IN 7
V
D 8
GND
9
ENCODE
10
13
12
11
D5
D6
D7 (MSB)
PIN FUNCTION DESCRIPTIONS
Pin Number
1
2
3
4, 9, 16
5, 8
6
Mnemonic
PWRDWN
VREF OUT
VREF IN
GND
V
D
A
IN
Function
Power-Down Function Select; Logic HIGH for Power-Down Mode (Digital Outputs Go
to High Impedance State)
Internal Reference Output (1.25 V typ); Bypass with 0.1
µF
to Ground
Reference Input for ADC (1.25 V typ)
Ground
Analog 3 V Power Supply
Analog Input for ADC (Can Be Left Open if Operating in Single-Ended Mode, but Rec-
ommend Connection to a 0.1
µF
Capacitor and a 25
Ω
Resistor in Series to Ground for
Better Input Matching)
Analog Input for ADC
Encode Clock for ADC (ADC Samples on Rising Edge of ENCODE)
Digital Outputs of ADC
Digital output power supply. Nominally 2.5 V to 3.6 V
7
10
11–14, 17–20
15
A
IN
ENCODE
D7–D4, D3–D0
V
DD
–4–
REV. C
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