PDF AD9280 Data sheet ( Hoja de datos )

Número de pieza	AD9280
Descripción	CMOS A/D Converter
Fabricantes	Analog Devices
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No Preview Available ! a Complete 8-Bit, 32 MSPS, 95 mW CMOS A/D Converter AD9280 FEATURES CMOS 8-Bit 32 MSPS Sampling A/D Converter Pin-Compatible with AD876-8 Power Dissipation: 95 mW (3 V Supply) Operation Between +2.7 V and +5.5 V Supply Differential Nonlinearity: 0.2 LSB Power-Down (Sleep) Mode Three-State Outputs Out-of-Range Indicator Built-In Clamp Function (DC Restore) Adjustable On-Chip Voltage Reference IF Undersampling to 135 MHz PRODUCT DESCRIPTION The AD9280 is a monolithic, single supply, 8-bit, 32 MSPS analog-to-digital converter with an on-chip sample-and-hold amplifier and voltage reference. The AD9280 uses a multistage differential pipeline architecture at 32 MSPS data rates and guarantees no missing codes over the full operating temperature range. The input of the AD9280 has been designed to ease the devel- opment of both imaging and communications systems. The user can select a variety of input ranges and offsets and can drive the input either single-ended or differentially. The sample-and-hold amplifier (SHA) is equally suited for both multiplexed systems that switch full-scale voltage levels in suc- cessive channels and sampling single-channel inputs at frequen- cies up to and beyond the Nyquist rate. AC-coupled input signals can be shifted to a predetermined level, with an onboard clamp circuit. The dynamic performance is excellent. The AD9280 has an onboard programmable reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application. A single clock input is used to control all internal conversion cycles. The digital output data is presented in straight binary output format. An out-of-range signal (OTR) indicates an over- flow condition which can be used with the most significant bit to determine low or high overflow. The AD9280 can operate with a supply range from +2.7 V to +5.5 V, ideally suiting it for low power operation in high speed applications. The AD9280 is specified over the industrial (–40°C to +85°C) temperature range. PRODUCT HIGHLIGHTS Low Power The AD9280 consumes 95 mW on a 3 V supply (excluding the reference power). In sleep mode, power is reduced to below 5 mW. Very Small Package The AD9280 is available in a 28-lead SSOP package. Pin Compatible with AD876-8 The AD9280 is pin compatible with the AD876-8, allowing older designs to migrate to lower supply voltages. 300 MHz Onboard Sample-and-Hold The versatile SHA input can be configured for either single- ended or differential inputs. Out-of-Range Indicator The OTR output bit indicates when the input signal is beyond the AD9280’s input range. Built-In Clamp Function Allows dc restoration of video signals. FUNCTIONAL BLOCK DIAGRAM CLAMP CLAMP IN CLK AVDD DRVDD VINA REFTF REFTS REFBS REFBF VREF REFSENSE SHA SHA GAIN SHA GAIN SHA GAIN SHA GAIN A/D A/D D/A A/D D/A A/D D/A A/D D/A CORRECTION LOGIC 1V AD9280 OUTPUT BUFFERS AVSS DRVSS STBY MODE THREE- STATE OTR D7 (MSB) D0 (LSB) REV. E 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 World Wide Web Site: http://www.analog.com © Analog Devices, Inc., 2010 1 page AD9280 ABSOLUTE MAXIMUM RATINGS* Parameter With Respect to Min Max Units AVDD AVSS DRVDD DRVSS AVSS DRVSS AVDD DRVDD MODE AVSS CLK AVSS Digital Outputs DRVSS AIN AVSS VREF AVSS REFSENSE AVSS REFTF, REFTB AVSS REFTS, REFBS AVSS Junction Temperature Storage Temperature Lead Temperature 10 sec –0.3 –0.3 –0.3 –6.5 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –0.3 –65 +6.5 V +6.5 V +0.3 V +6.5 V AVDD + 0.3 V AVDD + 0.3 V DRVDD + 0.3 V AVDD + 0.3 V AVDD + 0.3 V AVDD + 0.3 V AVDD + 0.3 V AVDD + 0.3 V +150 °C +150 °C +300 °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. AVDD DRVDD AVDD AVDD AVDD AVDD AVSS DRVSS DRVSS a. D0–D7, OTR AVDD AVSS d. AIN AVDD AVSS AVSS AVSS AVSS b. Three-State, Standby, Clamp c. CLK AVDD REFBS 25 AVSS AVDD REFBF 24 AVSS AVDD REFTF 22 AVSS AVDD REFTS 21 AVSS e. Reference AVDD AVDD AVDD AVSS f. CLAMPIN AVSS AVSS g. MODE h. REFSENSE Figure 2. Equivalent Circuits 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 AD9280 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. –4– AVSS i. VREF WARNING! ESD SENSITIVE DEVICE REV. E 5 Page AD9280 +FS –FS AIN +F/S RANGE OBTAINED FROM VREF PIN OR EXTERNAL REF REFTS REFBS –F/S RANGE OBTAINED FROM VREF PIN OR EXTERNAL REF SHA 10k⍀ AD9280 MODE (AVDD) REFTF 0.1␮F 10k⍀ 10k⍀ A2 A/D CORE 4.2k⍀ TOTAL 0.1␮F 10␮F 10k⍀ 0.1␮F REFBF a. Top/Bottom Mode V MIDSCALE AIN AD9280 MODE SHA AVDD/2 10k⍀ REFTF 0.1␮F REFTS REFBS 10k⍀ 10k⍀ A2 A/D CORE 4.2k⍀ 0.1␮F TOTAL 10␮F INTERNAL REF 10k⍀ 0.1␮F REFBF MIDSCALE OFFSET VOLTAGE IS DERIVED FROM INTERNAL OR EXTERNAL REF * MAXIMUM MAGNITUDE OF V IS DETERMINED BY INTERNAL REFERENCE b. Center Span Mode MAXIMUM MAGNITUDE OF V IS DETERMINED BY INTERNAL REFERENCE AND TURNS RATIO V AIN AVDD/2 SHA 10k⍀ AD9280 MODE AVDD/2 REFTF 0.1␮F REFTS REFBS 10k⍀ 10k⍀ A2 A/D CORE 4.2k⍀ 0.1␮F TOTAL 10␮F INTERNAL REF 10k⍀ REFBF 0.1␮F c. Differential Mode A1 1V AD9280 VREF (1V) REFSENSE AVSS 0.1␮F 1.0␮F d. 1 V Reference 1V A1 AD9280 10k⍀ VREF (2V) REFSENSE 0.1␮F 1.0␮F 10k⍀ AVSS e. 2 V Reference A1 1V AD9280 VREF (= 1 + RA/RB) RA REFSENSE RB AVSS 0.1␮F 1.0␮F INTERNAL 10K REF RESISTORS ARE SWITCHED OPEN BY THE PRESENSE OF RA AND RB. f. Variable Reference (Between 1 V and 2 V) Figure 16. A1 1V AD9280 VREF REFSENSE AVDD g. Internal Reference Disable (Power Reduction) –10– REV. E 11 Page

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