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AD9283BRS-100-AD9283BRS-50-AD9283BRS-80
8-Bit, 50 MSPS/80 MSPS/100 MSPS 3 V A/D Converter
REV.B
8-Bit, 50 MSPS/80 MSPS/100 MSPS
3 V A/D Converter
FUNCTIONAL BLOCK DIAGRAM
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 DESCRIPTIONThe 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).
AD9283–SPECIFICATIONS(VDD = 3.0 V, VD = 3.0 V; single-ended input; external reference, unless otherwise noted)ANALOG INPUT
SWITCHING PERFORMANCE
DIGITAL OUTPUTS
AD9283NOTESGain error and gain temperature coefficient are based on the ADC only (with a fixed 1.25 V external reference).tV and tPD 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 mA.Power dissipation measured with encode at rated speed and a dc analog input.Typical thermal impedance for the RS style (SSOP) 20-lead package: qJC = 46°C/W, qCA = 80°C/W, qJA = 126°C/W.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*VD, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+4 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . –0.5 V to VD + 0.5 V
Digital Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to VDD + 0.5 V
VREF IN . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VD + 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 . . . . . . . . . . . . . . . +175°C
Maximum Case Temperature . . . . . . . . . . . . . . . . . . +150°C
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
ORDERING GUIDE*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.
AD9283
EXPLANATION OF TEST LEVELS
Test Level100% production tested.100% production tested at +25°C and sample tested at
specified temperatures.
IIISample tested only.Parameter is guaranteed by design and characterization
testing.Parameter is a typical value only.100% production tested at +25°C; guaranteed by design
and characterization testing for industrial temperature
range; 100% production tested at temperature extremes for
military devices.
PIN CONFIGURATION
ENCODE
GND
VREF OUT
VREF IN
GND
AIN
D7 (MSB)
VDD
GND
PWRDWND0 (LSB)
AIN
PIN FUNCTION DESCRIPTIONS
Table I.Output Coding (VREF = +1.25 V)
AIN
AIN
33.3kV
14.3kVFigure 2.Equivalent Analog Input Circuit
Figure 3.Equivalent Reference Input Circuit
Figure 4. Equivalent Encode Input Circuit
Figure 5.Equivalent Digital Output Circuit
OUTFigure 6.Equivalent Reference Output Circuit
AIN
ENCODE
SAMPLE NSAMPLE N+1
SAMPLE N+2SAMPLE N+3
SAMPLE N+4SAMPLE N+5
D7–D0Figure 1.Timing Diagram
AD9283
FREQUENCY
–100Figure 7.Spectrum: fS = 100 MSPS, fIN = 10.3 MHz
Figure 8.Spectrum: fS = 100 MSPS, fIN = 40 MHz
FREQUENCY
–10Figure 9.Spectrum: fS = 100 MSPS, fIN = 76 MHz
Figure 10.Harmonic Distortion vs. AIN Frequency
Figure 11.Two-Tone Intermodulation Distortion
Figure 12.SINAD/SNR vs. AIN Frequency
