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.
a
AD9283
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
8-Bit, 50 MSPS/80 MSPS/100 MSPS
3 V A/D Converter
FUNCTIONAL BLOCK DIAGRAM
REF
TIMING
V
D
PWRDWN V
DD
A
IN
GND REF
OUT
REF
IN
ADC OUTPUT
STAGING
ENCODE
AD9283
8
D7–D0
T/H
A
IN
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
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).
–2– REV. C
AD9283–SPECIFICATIONS
(VDD = 3.0 V, VD = 3.0 V; single-ended input; external reference, unless otherwise noted)
Test AD9283BRS-100 AD9283BRS-80 AD9283BRS-50
Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Unit
RESOLUTION 8 8 8 Bits
DC ACCURACY
Differential Nonlinearity 25°CI ±0.5 +1.25 ±0.5 +1.25 ±0.5 +1.25 LSB
Full VI +1.50 +1.50 +1.50 LSB
Integral Nonlinearity 25°C I –1.25 ±0.75 +1.25 –1.25 ±0.75 +1.25 –1.25 ±0.75 +1.25 LSB
Full VI +2.25 +1.50 +1.50 LSB
No Missing Codes Full VI Guaranteed Guaranteed Guaranteed
Gain Error
1
25°CI –6 ±2.5 +6 –6 ±2.5 +6 –6 ±2.5 +6 % FS
Full VI –8 +8 –8 +8 –8 +8 % FS
Gain Tempco
1
Full VI 80 80 80 ppm/°C
ANALOG INPUT
Input Voltage Range
(With Respect to A
IN
) Full V ±512 ±512 ±512 mV p-p
Common-Mode Voltage Full V ±200 ±200 ±200 mV
Input Offset Voltage 25°C I –35 ±10 +35 –35 ±10 +35 –35 ±10 +35 mV
Full VI ±40 ±40 ±40 mV
Reference Voltage Full VI 1.2 1.25 1.3 1.2 1.25 1.3 1.2 1.25 1.3 V
Reference Tempco Full VI ±130 ±130 ±130 ppm/°C
Input Resistance 25°C I 7 10 13 7 10 13 7 10 13 kΩ
Full VI 5 16 5 16 5 16 kΩ
Input Capacitance 25°CV 2 2 2 pF
Full VI µA
Analog Bandwidth, Full Power 25°C V 475 475 475 MHz
SWITCHING PERFORMANCE
Maximum Conversion Rate Full VI 100 80 50 MSPS
Minimum Conversion Rate 25°CIV111MSPS
Encode Pulsewidth High (t
EH
)25°C IV 4.3 1000 5.0 1000 8.0 1000 ns
Encode Pulsewidth Low (t
EL
)25°C IV 4.3 1000 5.0 1000 8.0 1000 ns
Aperture Delay (t
A
)25°CV 0 0 0 ns
Aperture Uncertainty (Jitter) 25°C V 5 5 5 ps rms
Output Valid Time (t
V
)
2
Full VI 2.0 3.0 2.0 3.0 2.0 3.0 ns
Output Propagation Delay (t
PD
)
2
Full VI 4.5 7.0 4.5 7.0 4.5 7.0 ns
DIGITAL INPUTS
Logic “1” Voltage Full VI 2.0 2.0 2.0 V
Logic “0” Voltage Full VI 0.8 0.8 0.8 V
Logic “1” Current Full VI ±1±1±1µA
Logic “0” Current Full VI ±1±1±1µA
Input Capacitance 25°C V 2.0 2.0 2.0 pF
DIGITAL OUTPUTS
Logic “1” Voltage Full VI 2.95 2.95 2.95 V
Logic “0” Voltage Full VI 0.05 0.05 0.05 V
Output Coding Offset Binary Code Offset Binary Code Offset Binary Code
POWER SUPPLY
Power Dissipation
3, 4
Full VI 90 120 90 115 80 100 mW
Power-Down Dissipation Full VI 4.2 7 4.2 7 4.2 7 mW
Power Supply Rejection Ratio
(PSRR) 25°C I 18 18 18 mV/V
–3–REV. C
AD9283
Test AD9283BRS-100 AD9283BRS-80 AD9283BRS-50
Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Unit
DYNAMIC PERFORMANCE
5
Transient Response 25°CV 2 2 2 ns
Overvoltage Recovery Time 25°CV 2 2 2 ns
Signal-to-Noise Ratio (SNR)
(Without Harmonics)
f
IN
= 10.3 MHz 25°C I 46.5 47 44 47 dB
f
IN
= 27 MHz 25°C I 46.5 44 47 47 dB
f
IN
= 41 MHz 25°C I 43.5 46.5 47 dB
f
IN
= 76 MHz 25°C V 46.0 dB
Signal-to-Noise Ratio (SINAD)
(With Harmonics)
f
IN
= 10.3 MHz 25°C I 45 47 43.5 46.5 dB
f
IN
= 27 MHz 25°C I 45.5 43.5 46.5 46 dB
f
IN
= 41 MHz 25°C I 42.5 45 42 dB
f
IN
= 76 MHz 25°C V 42.5 dB
Effective Number of Bits
f
IN
= 10.3 MHz 25°C I 7.3 7.5 7.6 Bits
f
IN
= 27 MHz 25°C I 7.4 7.5 7.5 Bits
f
IN
= 41 MHz 25°C I 7.3 7.5 Bits
f
IN
= 76 MHz 25°C V 6.9 Bits
2nd Harmonic Distortion
f
IN
= 10.3 MHz 25°C I 57 60 55 60 dBc
f
IN
= 27 MHz 25°C I 60 55 60 56 dBc
f
IN
= 41 MHz 25°C I 50 58 55 dBc
f
IN
= 76 MHz 25°CV 46 dBc
3rd Harmonic Distortion
f
IN
= 10.3 MHz 25°C I 54.5 70 55 70 dBc
f
IN
= 27 MHz 25°C I 55 55 62.5 60 dBc
f
IN
= 41 MHz 25°C I 47 52.5 60 dBc
f
IN
= 76 MHz 25°CV 53 dBc
Two-Tone Intermod Distortion
(IMD)
f
IN
= 10.3 MHz 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
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.
ORDERING GUIDE
Temperature Package Package
Model Ranges Descriptions Options
AD9283BRS
-50, -80, -100 –40°C to +85°C 20-Lead SSOP RS-20
AD9283/PCB 25°C Evaluation Board
*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.
WARNING!
ESD SENSITIVE DEVICE
