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AD7475ARMZ-REEL

更新时间： 2024-11-06 12:58:07
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AD7475ARMZ-REEL 数据手册

 浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第2页浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第3页浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第4页浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第5页浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第6页浏览型号AD7475ARMZ-REEL的Datasheet PDF文件第7页 
1 MSPS,  
12-Bit ADCs  
a
AD7475/AD7495  
FUNCTIONAL BLOCK DIAGRAMS  
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:  
V
DD  
12-BIT  
SUCCESSIVE  
APPROXIMATION  
ADC  
T/H  
V
IN  
REF IN  
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 ␮A Max  
SCLK  
SDATA  
CS  
CONTROL  
LOGIC  
V
DRIVE  
AD7475  
8-Lead ␮SOIC and SOIC Packages  
GND  
V
APPLICATIONS  
DD  
Battery-Powered Systems  
Personal Digital Assistants  
Medical Instruments  
Mobile Communications  
Instrumentation and Control Systems  
Data Acquisition Systems  
High-Speed Modems  
12-BIT  
SUCCESSIVE  
APPROXIMATION  
ADC  
T/H  
V
IN  
REF OUT  
BUF  
SCLK  
SDATA  
CS  
Optical Sensors  
CONTROL  
LOGIC  
2.5V  
REFERENCE  
GENERAL DESCRIPTION  
V
DRIVE  
The AD7475/AD7495 are 12-bit high-speed, low-power,  
successive-approximation ADCs. The parts operate from a single  
2.7 V to 5.25 V power supply and feature throughput rates up to  
1 MSPS. The parts contain a low-noise, wide bandwidth track/hold  
amplifier that can handle input frequencies in excess of 1 MHz.  
AD7495  
GND  
PRODUCT HIGHLIGHTS  
1. High throughput with low power consumption. The  
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 also initiated at this point.  
There are no pipelined delays associated with the part.  
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  
V
DRIVE function allows the serial interface to connect directly  
The AD7475/AD7495 use advanced design techniques to achieve  
very low power dissipation at high throughput rates. With 3 V  
supplies and 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.  
to either 3 V or 5 V processor systems independent of VDD  
.
3. Flexible power/serial clock speed management. The con-  
version rate is determined by the serial clock, allowing the  
conversion time to be reduced through the serial clock speed  
increase. The part also features shutdown modes to maximize  
power efficiency at lower throughput rates. This allows the  
average power consumption to be reduced while not convert-  
ing. Power consumption is 1 µA when in full shutdown.  
The analog input range for the part 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. The conver-  
sion time is determined by the SCLK frequency.  
4. No pipeline delay. The part features a standard successive-  
approximation ADC with accurate control of the sampling  
instant via a CS input and once off conversion control.  
MICROWIRE is a trademark of National Semiconductor Corporation.  
SPI and QSPI are trademarks of Motorola, Inc.  
REV. A  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
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  
www.analog.com  
© Analog Devices, Inc., 2001  
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