Datasheet AD9280 (Analog Devices)

a
Complete 8-Bit, 32 MSPS, 95 mW CMOS A/D Converter AD9280 FEATURES
A single clock input is used to control all internal conversion
CMOS 8-Bit 32 MSPS Sampling A/D Converter
cycles. The digital output data is presented in straight binary
Pin-Compatible with AD876-8
output format. An out-of-range signal (OTR) indicates an over-
Power Dissipation: 95 mW (3 V Supply)
flow condition which can be used with the most significant bit
Operation Between +2.7 V and +5.5 V Supply
to determine low or high overflow.
Differential Nonlinearity: 0.2 LSB
The AD9280 can operate with a supply range from +2.7 V to
Power-Down (Sleep) Mode
+5.5 V, ideally suiting it for low power operation in high speed
Three-State Outputs
applications.
Out-of-Range Indicator Built-In Clamp Function (DC Restore)
The AD9280 is specified over the industrial (–40°C to +85°C)
Adjustable On-Chip Voltage Reference
temperature range.
IF Undersampling to 135 MHz PRODUCT HIGHLIGHTS PRODUCT DESCRIPTION Low Power
The AD9280 is a monolithic, single supply, 8-bit, 32 MSPS The AD9280 consumes 95 mW on a 3 V supply (excluding the analog-to-digital converter with an on-chip sample-and-hold reference power). In sleep mode, power is reduced to below amplifier and voltage reference. The AD9280 uses a multistage 5 mW. differential pipeline architecture at 32 MSPS data rates and
Very Small Package
guarantees no missing codes over the full operating temperature The AD9280 is available in a 28-lead SSOP package. range.
Pin Compatible with AD876-8
The input of the AD9280 has been designed to ease the devel- The AD9280 is pin compatible with the AD876-8, allowing opment of both imaging and communications systems. The user older designs to migrate to lower supply voltages. can select a variety of input ranges and offsets and can drive the input either single-ended or differentially.
300 MHz Onboard Sample-and-Hold
The versatile SHA input can be configured for either single- The sample-and-hold amplifier (SHA) is equally suited for both ended or differential inputs. multiplexed systems that switch full-scale voltage levels in suc- cessive channels and sampling single-channel inputs at frequen-
Out-of-Range Indicator
cies up to and beyond the Nyquist rate. AC-coupled input The OTR output bit indicates when the input signal is beyond signals can be shifted to a predetermined level, with an onboard the AD9280’s input range. clamp circuit. The dynamic performance is excellent.
Built-In Clamp Function
The AD9280 has an onboard programmable reference. An Allows dc restoration of video signals. external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application.
FUNCTIONAL BLOCK DIAGRAM CLAMP CLAMP IN CLK AVDD DRVDD STBY SHA SHA GAIN SHA GAIN SHA GAIN SHA GAIN MODE VINA A/D REFTF A/D D/A A/D D/A A/D D/A THREE- REFTS A/D D/A STATE REFBS CORRECTION LOGIC REFBF OUTPUT BUFFERS OTR VREF REFSENSE D7 (MSB) 1V AD9280 D0 (LSB) AVSS DRVSS
REV. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
use, nor for any infringements of patents or other rights of third parties
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Fax: 781/326-8703 © Analog Devices, Inc.,
2010 Document Outline FEATURES PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM AD9280-SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS DEFINITIONS OF SPECIFICATIONS TYPICAL CHARACTERIZATION CURVES APPLYING THE AD9280 Theory of Operation Operational Modes Summary of Modes Voltage Reference Reference Buffer Analog Input Special Input and Reference Overview REFERENCE OPERATION Internal Reference Operation External Reference Operation STANDBY OPERATION CLAMP OPERATION Clamp Circuit Example DRIVING THE ANALOG INPUT DIFFERENTIAL INPUT OPERATION AD876-8 MODE OF OPERATION CLOCK INPUT DIGITAL INPUTS AND OUTPUTS APPLICATIONS Direct IF Down Conversion Using the AD9280 Grounding and Layout Rules Digital Outputs Three-State Outputs OUTLINE DIMENSIONS Ordering Guide REVISION HISTORY