Datasheet AD9244 (Analog Devices)

14-Bit, 40 MSPS/65 MSPS A/D Converter AD9244 FEATURES FUNCTIONAL BLOCK DIAGRAM 14-bit, 40 MSPS/65 MSPS ADC AVDD REFT REFB DRVDD Low power AD9244 550 mW at 65 MSPS 300 mW at 40 MSPS VIN+ DFS 10-STAGE 14 On-chip reference and sample-and-hold SHA PIPELINE ADC VIN– 750 MHz analog input bandwidth SNR > 73 dBc to Nyquist @ 65 MSPS CLK+ OTR SFDR > 86 dBc to Nyquist @ 65 MSPS OUTPUT Differential nonlinearity error = ±0.7 LSB CLK– TIMING REGISTER Guaranteed no missing codes over full temperature range DCS 1 V to 2 V p-p differential full-scale analog input range 14 Single 5 V analog supply, 3.3 V/5 V driver supply D13 TO D0 Out-of-range indicator REFERENCE Straight binary or twos complement output data OEB Clock duty cycle stabilizer Output-enable function AGND CML VR VREF SENSE REF DGND 48-lead LQFP package GND
02404-001 Figure 1.
APPLICATIONS
Fabricated on an advanced CMOS process, the AD9244 is
Communication subsystems (microcell, picocell)
available in a 48-lead LQFP and is specified for operation over
Medical and high-end imaging equipment
the industrial temperature range (–40°C to +85°C).
Test and measurement equipment PRODUCT HIGHLIGHTS
1.
Low Power
—The AD9244, at 550 mW, consumes a fraction
GENERAL DESCRIPTION
of the power of currently available ADCs in existing high The AD9244 is a monolithic, single 5 V supply, 14-bit, speed solutions. 40 MSPS/65 MSPS ADC with an on-chip, high performance 2.
IF Sampling
—The AD9244 delivers outstanding sample-and-hold amplifier (SHA) and voltage reference. performance at input frequencies beyond the first Nyquist zone. Sampling at 65 MSPS with an input frequency of The AD9244 uses a multistage differential pipelined architec- 100 MHz, the AD9244 delivers 71 dB SNR and 86 dB SFDR. ture with output error correction logic to provide 14-bit 3.
Pin Compatibility
—The AD9244 offers a seamless accuracy at 40 MSPS/65 MSPS data rates, and guarantees no migration from the 12-bit, 65 MSPS AD9226. missing codes over the full operating temperature range. 4.
On-Board Sample-and-Hold (SHA)
—The versatile SHA The AD9244 has an on-board, programmable voltage reference. input can be configured for either single-ended or An external reference can also be used to suit the dc accuracy differential inputs. and temperature drift requirements of the application. 5.
Out-of-Range (OTR) Indicator
—The OTR output bit indicates when the input signal is beyond the AD9244’s A differential or single-ended clock input controls all internal input range. conversion cycles. The digital output data can be presented in 6.
Single Supply
—The AD9244 uses a single 5 V power straight binary or in twos complement format. An out-of-range supply, simplifying system power supply design. It also (OTR) signal indicates an overflow condition that can be used features a separate digital output driver supply to with the most significant bit to determine low or high overflow. accommodate 3.3 V and 5 V logic families.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS AC SPECIFICATIONS DIGITAL SPECIFICATIONS SWITCHING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL APPLICATION CIRCUITS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ANALOG INPUT AND REFERENCE OVERVIEW ANALOG INPUT OPERATION Single-Ended Input Configuration Differentially Driving the Analog Inputs REFERENCE OPERATION Pin-Programmable Reference Resistor-Programmable Reference Using an External Reference Digital Outputs Data Format Select (DFS) Digital Output Driver Considerations DIGITAL INPUTS AND OUTPUTS Out of Range (OTR) Digital Output Enable Function (OEB) Clock Overview Clock Input Modes Clock Input Considerations Clock Power Dissipation Clock Stabilizer (DCS) Grounding and Decoupling Analog and Digital Grounding Analog Supply Decoupling Digital Supply Decoupling Reference Decoupling CML VR EVALUATION BOARD ANALOG INPUT CONFIGURATION REFERENCE CONFIGURATION CLOCK CONFIGURATION OUTLINE DIMENSIONS ORDERING GUIDE