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AD9480-AD9480ASUZ-250-AD9480BSUZ-250
8-Bit, 250 MSPS, 3.3 V A/D Converter
8-Bit, 250 MSPS
3.3 V A/D Converter
FEATURES
DNL = ± 0.25 LSB
INL = ± 0.5 LSB
Single 3.3 V supply operation (3.0 to 3.6 V)
Power dissipation of 590 mW at 250 MSPS
1 V p-p analog input range
Internal 1.0 V reference
Single-ended or differential analog inputs
LVDS outputs (ANSI 644 levels)
Power-down mode
Clock duty cycle stabilizer
APPLICATIONS
Digital oscilloscopes
Instrumentation and measurement
Communications:
Point-to-point radios
Predistortion loops

GENERAL DESCRIPTION

The AD9480 is an 8-bit, monolithic analog-to-digital converter
optimized for high speed and low power consumption. Small in
size and easy to use, the product operates at a 250 MSPS
conversion rate, with excellent linearity and dynamic
performance over its full operating range.
To minimize system cost and power dissipation, the AD9480
includes an internal reference and track-and-hold circuit. The
user only provides a 3.3 V power supply and a differential
encode clock. No external reference or driver components are
required for many applications.
The digital outputs are LVDS (ANSI 644) compatible with an
option of twos complement or binary output format. The output
data bits are provided in parallel fashion along with an LVDS
output clock, which simplifies data capture.
Fabricated on an advanced BiCMOS process, the AD9480 is
available in a 44-lead surface-mount package (TQFP) specified
over the industrial temperature range (−40°C to +85°C).
FUNCTIONAL BLOCK DIAGRAM

D7–D0
(LVDS)
(LVDS)
VIN+
VIN–
CLK+
VREFSENSE
DCO+
DCO-
AGNDDrGNDDRVDDAVDD
LVDSBIASPDWNS1

Figure 1.
PRODUCT HIGHLIGHTS

1. Superior linearity.
A DNL of ±0.25 makes the AD9480 suitable for
instrumentation and measurement applications.
2. Power-down mode.
A power-down function may be exercised to bring total
consumption down to 15 mW.
3. LVDS outputs (ANSI-644).
LVDS outputs simplify timing and improve noise
performance.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
TABLE OF CONTENTS
DC Specifications.............................................................................3
Digital Specifications........................................................................4
AC Specifications..............................................................................5
Switching Specifications..................................................................6
Timing Diagram...........................................................................6
Absolute Maximum Ratings............................................................7
Explanation of Test Levels...........................................................7
ESD Caution..................................................................................7
Pin Configuration and Function Descriptions.............................8
Definitions.........................................................................................9
Equivalent Circuits.........................................................................11
Application Notes...........................................................................12
Clocking the AD9480.................................................................12
Analog Inputs..............................................................................12
Voltage Reference.......................................................................13
Digital Outputs...........................................................................14
Output Coding............................................................................14
Interleaving Two AD9480s........................................................14
Data Clock Out...........................................................................14
Typical Performance Characteristics...........................................15
AD9480 Evaluation Board............................................................19
Power Connector........................................................................19
Analog Inputs..............................................................................19
Gain..............................................................................................19
Optional Operational Amplifier...............................................19
Clock............................................................................................19
Optional Clock Buffer...............................................................19
Optional XTAL...........................................................................19
Voltage Reference.......................................................................20
Data Outputs...............................................................................20
Evaluation Board Bill of Materials...............................................21
PCB Schematics..............................................................................22
PCB Layers......................................................................................24
Outline Dimensions.......................................................................26
Ordering Guide..........................................................................27
REVISION HISTORY
7/04—Revision 0: Initial Version

DC SPECIFICATIONS
AVDD = 3.3 V, DRVDD = 3.3 V; TMIN = –40°C, TMAX = +85°C, AIN = –1 dBFS, full scale = 1.0 V, internal reference, differential analog and
clock inputs, unless otherwise noted.
Table 1.

Power Supply Rejection Ratio (PSRR) 25°C V −4.2 mV/V
Gain error and gain temperature coefficients are based on the ADC only (with a fixed 1 V external reference and a 1 V p-p differential analog input).
2 Internal reference mode; SENSE = AGND. External reference mode; VREF driven by external 1.0 V reference; SENSE = AVDD.
4 In FS = 1 V, both analog inputs are 500 mV p-p and out of phase with each other. Power dissipation and current measured with rated encode and a dc analog input (outputs static). See Figure 29 for active operation.
DIGITAL SPECIFICATIONS
AVDD = 3.3 V, DRVDD = 3.3 V; TMIN = –40°C, TMAX = +85°C, AIN = –1 dBFS, full scale = 1.0 V, internal reference, differential analog and
clock inputs, unless otherwise noted.
Table 2.


1 The common mode for CLOCK inputs can be externally set, such that 0.9 V < CLK ± < 2.6 V. LVDSBIAS resistor = 3.74 kΩ.
AC SPECIFICATIONS
AVDD = 3.3 V, DRVDD = 3.3 V; TMIN = –40°C, TMAX = +85°C, AIN = –1 dBFS, full scale = 1.0 V, internal reference, differential analog and
clock inputs, unless otherwise noted.
Table 3.


1 Nyquist bin energy ignored.
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