Datasheet AD8137 (Analog Devices)

Low Cost, Low Power, Differential ADC Driver Data Sheet AD8137 FEATURES FUNCTIONAL BLOCK DIAGRAM Fully differential AD8137 Extremely low power with power-down feature –IN 1 8 +IN 2.6 mA quiescent supply current @ 5 V VOCM 2 7 PD 450 µA in power-down mode @ 5 V VS+ 3 6 VS– High speed +OUT 4 5 –OUT 110 MHz large signal 3 dB bandwidth @ G = 1
04771-0-001 Figure 1.
450 V/µs slew rate 12-bit SFDR performance @ 500 kHz Fast settling time: 100 ns to 0.02% 3 Low input offset voltage: ±2.6 mV max 2 G = 1 Low input offset current: 0.45 µA max 1 Differential input and output 0 –1 G = 2 Differential-to-differential or single-ended-to-differential G = 5 –2 operation –3 Rail-to-rail output –4 –5 Adjustable output common-mode voltage –6 G = 10 Externally adjustable gain –7 Wide supply voltage range: 2.7 V to 12 V –8 Available in small SOIC package –9 –10 Qualified for automotive applications NORMALIZED CLOSED-LOOP GAIN (dB) RG = 1k
Ω
–11 VO, dm = 0.1V p-p APPLICATIONS –12
04771-0-002
0.1 1 10 100 1000 FREQUENCY (MHz) ADC drivers
Figure 2. Small Signal Response for Various Gains
Automotive vision and safety systems Automotive infotainment systems Portable instrumentation Battery-powered applications Single-ended-to-differential converters Differential active filters Video amplifiers Level shifters GENERAL DESCRIPTON
The AD8137 is a low cost differential driver with a rail-to-rail closed-loop gain of the amplifier. The power-down feature is output that is ideal for driving ADCs in systems that are sensitive beneficial in critical low power applications. to power and cost. The AD8137 is easy to apply, and its internal The AD8137 is manufactured on Analog Devices, Inc., common-mode feedback architecture al ows its output common- proprietary second-generation XFCB process, enabling it to mode voltage to be controlled by the voltage applied to one pin. achieve high levels of performance with very low power The internal feedback loop also provides inherently balanced consumption. outputs as well as suppression of even-order harmonic distortion products. Fully differential and single-ended-to-differential gain The AD8137 is available in the small 8-lead SOIC package and configurations are easily realized by the AD8137. External 3 mm × 3 mm LFCSP package. It is rated to operate over the feedback networks consisting of four resistors determine the extended industrial temperature range of −40°C to +125°C.
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Document Outline Features Applications Functional Block Diagram General Descripton Revision History Specifications Absolute Maximum Ratings Thermal Resistance Maximum Power Dissipation ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Test Circuits Theory of Operation Applications Information Analyzing a Typical Application with Matched RF and RG Networks Typical Connection and Definition of Terms Output Balance Estimating Noise, Gain, and Bandwith with Matched Feedback Networks Estimating Output Noise Voltage and Bandwidth Voltage Gain Feedback Factor Notation Input Common-Mode Voltage Calculating Input Impedance Input Common-Mode Swing Considerations Bandwidth vs. Closed-Loop Gain Estimating DC Errors Additional Impact of Mismatches in the Feedback Networks Driving a Capacitive Load Layout Considerations Terminating a Single-Ended Input Power-Down Driving an ADC with Greater than 12-Bit Performance Outline Dimensions Ordering Guide Automotive Products