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AD9050BR-AD9050BRS-60
10-Bit, 40 MSPS/60 MSPS A/D Converter
FUNCTIONAL BLOCK DIAGRAM
ENCODE
AIN
AINBREV.B
FEATURES
Low Power: 315 mW @ 40 MSPS, 345 mW @ 60 MSPS
On-Chip T/H, Reference
Single +5 V Power Supply Operation
Selectable 5 V or 3 V Logic I/O
SNR: 53 dB Minimum at 10 MHz w/40 MSPS
APPLICATIONS
Medical Imaging
Instrumentation
Digital Communications
Professional Video
PRODUCT DESCRIPTIONThe AD9050 is a complete 10-bit monolithic sampling analog-
to-digital converter (ADC) with an onboard track-and-hold and
reference. The unit is designed for low cost, high performance
applications and requires only +5 V and an encode clock to
achieve 40 MSPS or 60MSPS sample rates with 10-bit resolution.
The encode clock is TTL compatible and the digital outputs
are CMOS; both can operate with 5 V/3 V logic, selected by the
user. The two-step architecture used in the AD9050 is opti-
mized to provide the best dynamic performance available while
maintaining low power consumption.
A 2.5 V reference is included onboard, or the user can provide
an external reference voltage for gain control or matching of
multiple devices. Fabricated on an advanced BiCMOS pro-
cess, the AD9050 is packaged in space saving surface mount
packages (SOIC, SSOP) and is specified over the industrial
(–40°C to +85°C) temperature range. The 60MSPS version
(AD9050BRS-60) is only available in the SSOP package.
Figure 1.Typical Connections
10-Bit, 40 MSPS/60MSPS
A/D Converter
AD9050–SPECIFICATIONS
ELECTRICAL CHARACTERISTICSANALOG INPUT
BANDGAP REFERENCE
SWITCHING PERFORMANCE
(VD, VDD = +5 V; internal reference; ENCODE = 40 MSPS for BR/BRS, 60 MSPS for BRS-60
unless otherwise noted)
DIGITAL OUTPUTS
POWER SUPPLY
NOTES“Gain Tempco” is for converter only; “Temperature Coefficient” is for bandgap reference only.Output propagation delay (tPD) is measured from the 50% point of the rising edge of the encode command to the midpoint of the digital outputs with 10 pF maximum
loads.RMS signal to rms noise with analog input signal 0.5 dB below full scale at specified frequency for BR/BRS, 1.0 dB below full scale for BRS-60.Intermodulation measured relative to either tone with analog input frequencies of 9.5 MHz and 9.9 MHz at 7 dB below full scale.Power dissipation is measured at full update rate with AIN of 10.3 MHz and digital outputs loaded with 10 pF maximum. See Figure 4 for power dissipation at other
conditions.Measured as the ratio of the change in offset voltage for 5% change in +VD.
Specifications subject to change without notice.
AD9050
EXPLANATION OF TEST LEVELS
Test Level–100% Production Tested.–Parameter is guaranteed by design and characteriza-
tion testing.–Parameter is a typical value only.
ABSOLUTE MAXIMUM RATINGS*VD, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7 V
ANALOG IN . . . . . . . . . . . . . . . . . . . . . .–1.0 V to VD + 1.0 V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.5 V to VD
VREF Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.5 V to VD
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . .20 mA
Operating Temperature
AD9050BR/BRS/BRS-60 . . . . . . . . . . . . . . .–40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . .–65°C to +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 above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods may effect device reliability.
ORDERING GUIDE*R = Small Outline (SO); RS = Shrink Small Outline (SSOP).
AD9050
Table I.AD9050 Digital Coding (Single Ended Input AIN, AINB Bypassed to GND)
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
GND
D0 (LSB)
VREFOUT
VREFIN
VDD
GNDCOMP
REFBP
GND
AINB
AIND5
VDD
GND
GND
ENCODE
D9 (MSB)
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.
Although the AD9050 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.
N + 1N + 2N + 3N + 4N + 5AIN
ENCODE
DIGITAL
OUTPUTS
tPD
*FOR BR/BRS, SEE SPECIFICATION TABLEFigure 2.Timing Diagram
AINB (Pin 9)
AIN (Pin 10)
INPUT
VREFIN
(Pin 4)
VREFBF
(Pin 6)
VDD (Pins 20, 22)
+3V to +5V
D0–D9, OR
ENCODE
(Pin 13)
VREFOUT
(Pin 3)Figure 3.Equivalent Circuits
Output StageEncode InputAnalog Input
VREF OutputReference Circuit
AD9050–Typical Performance Curves
TEMPERATURE – °C
–40– 20
SIGNAL-TO-NOISE RATIO – dB
(SINAD)20406080Figure 7.SNR vs. Temperature
FREQUENCY – MHz
–90Figure 8.Two-Tone IMD
DIFF PHASE – Degrees
DIFF GAIN – %34563456Figure 9.Differential Gain/Differential Phase
CLOCK RATE – MSPS
DISSIPATION – mW30405060
320Figure 4.Power Dissipation vs. Clock Rate
10100
ANALOG INPUT FREQUENCY – MHzFigure 5.SNR/Distortion vs. Frequency
CLOCK RATE – MSPS
SNR – dB20304060Figure 6.SNR vs. Clock Rate
