Datasheet AD7356 (Analog Devices)

Differential Input, Dual, Simultaneous Sampling, 5 MSPS, 12-Bit, SAR ADC Data Sheet AD7356 FEATURES FUNCTIONAL BLOCK DIAGRAM Dual 12-bit SAR ADC V V DD DRIVE Simultaneous sampling AD7356 Throughput rate: 5 MSPS per channel V Specified for V INA+ 12-BIT DD at 2.5 V T/H SUCCESSIVE V SDATA No conversion latency INA– APPROXIMATION A ADC REF Power dissipation: 36 mW at 5 MSPS A On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C BUF Dual conversion with read High speed serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP- SCLK CONTROL REF LOGIC compatible CS −40°C to +125°C operation BUF Available in a 16-lead TSSOP APPLICATIONS REFB 12-BIT SUCCESSIVE VINB+ APPROXIMATION SDATAB Data acquisition systems T/H ADC VINB– Motion control
001
I and Q demodulation
06505-
AGND AGND REFGND DGND
Figure 1.
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73561 is a dual, 12-bit, high speed, low power, successive 1. Two Complete ADC Functions. approximation ADC that operates from a single 2.5 V power These functions al ow simultaneous sampling and conversion supply and features throughput rates up to 5 MSPS. The device of two channels. The conversion result of both channels contains two ADCs, each preceded by a low noise, wide bandwidth is simultaneously available on separate data lines or in track-and-hold circuit that can handle input frequencies in excess succession on one data line if only one serial port is of 110 MHz. available. The conversion process and data acquisition use standard control 2. High Throughput with Low Power Consumption. inputs al owing for easy interfacing to microprocessors or DSPs. The AD7356 offers a 5 MSPS throughput rate with 36 mW The input signal is sampled on the falling edge of CS; a conversion power consumption. is also initiated at this point. The conversion time is determined 3. No Conversion Latency. by the SCLK frequency. The AD7356 features two standard successive approximation ADCs with accurate control of the sampling instant via a The AD7356 uses advanced design techniques to achieve very CS input and, once off, conversion control. low power dissipation at high throughput rates. With a 2.5 V supply and a 5 MSPS throughput rate, the part consumes typical y
Table 1. Related Devices
14 mA. The part also offers a flexible power/throughput rate
Generic Resolution Throughput Analog Input
management option. AD7352 12-bit 3 MSPS Differential The analog input range for the part is the differential common AD7357 14-bit 4.25 MSPS Differential mode ±VREF/2. The AD7356 has an on-chip 2.048 V reference AD7266 12-bit 2 MSPS Differential/single ended that can be overdriven when an external reference is preferred. AD7866 12-bit 1 MSPS Single-ended The AD7356 is available in a 16-lead thin shrink small outline AD7366 12-bit 1 MSPS Single-ended bipolar package (TSSOP). AD7367 14-bit 1 MSPS Single-ended bipolar 1 Protected by U.S. Patent No. 6,681,332.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT STRUCTURE ANALOG INPUTS DRIVING DIFFERENTIAL INPUTS Differential Amplifier Op Amp Pair VOLTAGE REFERENCE ADC TRANSFER FUNCTION MODES OF OPERATION NORMAL MODE PARTIAL POWER-DOWN MODE FULL POWER-DOWN MODE POWER-UP TIMES POWER vs. THROUGHPUT RATE SERIAL INTERFACE APPLICATION HINTS GROUNDING AND LAYOUT EVALUATING THE AD7356 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE