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AD7475 Dataheets PDF



Part Number AD7475
Manufacturers Analog Devices
Logo Analog Devices
Description 12-Bit ADC
Datasheet AD7475 DatasheetAD7475 Datasheet (PDF)

Data Sheet FEATURES Fast throughput rate: 1 MSPS Specified for VDD of 2.7 V to 5.25 V Low power 4.5 mW max at 1 MSPS with 3 V supplies 10.5 mW max at 1 MSPS with 5 V supplies Wide input bandwidth: 68 dB SNR at 300 kHz input frequency Flexible power/serial clock speed management No pipeline delays High speed serial interface SPI-/QSPI™-/MICROWIRE-/DSP-compatible On-board reference: 2.5 V (AD7495 only) Standby mode: 1 µA max 8-lead MSOP and SOIC packages APPLICATIONS Battery-powered systems Pe.

  AD7475   AD7475



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Data Sheet FEATURES Fast throughput rate: 1 MSPS Specified for VDD of 2.7 V to 5.25 V Low power 4.5 mW max at 1 MSPS with 3 V supplies 10.5 mW max at 1 MSPS with 5 V supplies Wide input bandwidth: 68 dB SNR at 300 kHz input frequency Flexible power/serial clock speed management No pipeline delays High speed serial interface SPI-/QSPI™-/MICROWIRE-/DSP-compatible On-board reference: 2.5 V (AD7495 only) Standby mode: 1 µA max 8-lead MSOP and SOIC packages APPLICATIONS Battery-powered systems Personal digital assistants Medical instruments Mobile communications Instrumentation and control systems Data acquisition systems Optical sensors GENERAL DESCRIPTION The AD7475/AD74951 are 12-bit, high speed, low power, successive-approximation ADCs that operate from a single 2.7 V to 5.25 V power supply with throughput rates up to 1 MSPS. They contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies above 1 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is initiated at this point. The conversion time is determined by the SCLK frequency. There are no pipeline delays associated with the device. The AD7475/AD7495 use advanced design techniques to achieve very low power dissipation at high throughput rates. With 3 V supplies and a 1 MSPS throughput rate, the AD7475 consumes just 1.5 mA, while the AD7495 consumes 2 mA. With 5 V supplies and 1 MSPS, the current consumption is 2.1 mA for the AD7475 and 2.6 mA for the AD7495. The analog input range for the devices is 0 V to REF IN. The 2.5 V reference for the AD7475 is applied externally to the REF IN pin, while the AD7495 has an on-board 2.5 V reference. 1Protected by U.S. Patent No. 6,681,332 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 1 MSPS,12-Bit ADCs AD7475/AD7495 FUNCTIONAL BLOCK DIAGRAM VDD VIN REF IN T/H 12-BIT SUCCESSIVE APPROXIMATION ADC AD7475 VDD CONTROL LOGIC GND SCLK SDATA CS VDRIVE VIN REF OUT T/H BUF 2.5V REFERENCE AD7495 12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC SCLK SDATA CS VDRIVE 01684-B-001 GND Figure 1. PRODUCT HIGHLIGHTS 1. The AD7475 offers 1 MSPS throughput rates with 4.5 mW power consumption. 2. Single-supply operation with VDRIVE function. The AD7475/AD7495 operate from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial interface to connect directly to either 3 V or 5 V processor systems i.


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