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AD7918 PDF预览

AD7918

更新时间： 2024-01-11 07:18:30
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
24页 574K
描述
8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP

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AD7918 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：TSSOP
包装说明：TSSOP, TSSOP20,.25针数：20
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.38
最大模拟输入电压：5 V最小模拟输入电压：
最长转换时间：0.8 µs转换器类型：ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：R-PDSO-G20JESD-609代码：e3
长度：6.5 mm最大线性误差 (EL)：0.0488%
湿度敏感等级：1模拟输入通道数量：8
位数：10功能数量：1
端子数量：20最高工作温度：85 °C
最低工作温度：-40 °C输出位码：BINARY, 2'S COMPLEMENT BINARY
输出格式：SERIAL封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装等效代码：TSSOP20,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260电源：3/5 V
认证状态：Not Qualified采样速率：1 MHz
采样并保持/跟踪并保持：TRACK座面最大高度：1.2 mm
子类别：Analog to Digital Converters标称供电电压：3 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：4.4 mm
Base Number Matches：1

AD7918 数据手册

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8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs  
with Sequencer in 20-Lead TSSOP  
AD7908/AD7918/AD7928  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Fast Throughput Rate: 1 MSPS  
Specified for AVDD of 2.7 V to 5.25 V  
Low Power:  
6.0 mW Max at 1 MSPS with 3 V Supply  
13.5 mW Max at 1 MSPS with 5 V Supply  
8 (Single-Ended) Inputs with Sequencer  
Wide Input Bandwidth:  
AV  
DD  
REF  
IN  
V
0
IN  
T/H  
•
•
•
•
•
•
•
•
•
•
•
•
•
8-/10-/12-BIT  
SUCCESSIVE  
APPROXIMATION  
ADC  
AD7928, 70 dB Min SINAD at 50 kHz Input Frequency  
Flexible Power/Serial Clock Speed Management  
No Pipeline Delays  
I/P  
MUX  
High Speed Serial Interface SPI®/QSPI™/  
MICROWIRE™/DSP Compatible  
Shutdown Mode: 0.5 ␮A Max  
V
7
20-Lead TSSOP Package  
IN  
SCLK  
DOUT  
DIN  
CONTROL LOGIC  
SEQUENCER  
GENERAL DESCRIPTION  
The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit,  
and 12-bit, high speed, low power, 8-channel, 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-  
and-hold amplifier that can handle input frequencies in excess  
of 8 MHz.  
CS  
AD7908/AD7918/AD7928  
V
DRIVE  
GND  
PRODUCT HIGHLIGHTS  
1. High Throughput with Low Power Consumption.  
The conversion process and data acquisition are controlled using  
CS and the serial clock signal, allowing the device to easily inter-  
face 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 pipeline delays associated with the part.  
The AD7908/AD7918/AD7928 offer up to 1 MSPS throughput  
rates. At the maximum throughput rate with 3 V supplies, the  
AD7908/AD7918/AD7928 dissipate just 6 mW of power  
maximum.  
The AD7908/AD7918/AD7928 use advanced design techniques to  
achieve very low power dissipation at maximum throughput rates.  
At maximum throughput rates, the AD7908/AD7918/AD7928  
consume 2 mA maximum with 3 V supplies; with 5 V supplies, the  
current consumption is 2.7 mA maximum.  
2. Eight Single-Ended Inputs with a Channel Sequencer.  
A sequence of channels can be selected, through which the  
ADC will cycle and convert on.  
3. Single-Supply Operation with VDRIVE Function.  
The AD7908/AD7918/AD7928 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  
Through the configuration of the Control Register, the analog  
input range for the part can be selected as 0 V to REFIN or 0 V to  
2 ϫ REFIN, with either straight binary or twos complement out-  
put coding. The AD7908/AD7918/AD7928 each feature eight  
single-ended analog inputs with a channel sequencer to allow a  
preprogrammed selection of channels to be converted sequentially.  
independent of AVDD  
.
4. Flexible Power/Serial Clock Speed Management.  
The conversion rate is determined by the serial clock, allowing  
the conversion time to be reduced through the serial clock  
speed increase. The parts also feature various shutdown  
modes to maximize power efficiency at lower throughput rates.  
Current consumption is 0.5 µA max when in full shutdown.  
The conversion time for the AD7908/AD7918/AD7928 is deter-  
mined by the SCLK frequency, which is also used as the master  
clock to control the conversion.  
5. No Pipeline Delay.  
The parts feature a standard successive approximation ADC  
with accurate control of the sampling instant via a CS input  
and once off conversion control.  
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. Trademarks and  
registered trademarks are the property of their respective companies.  
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  
© 2003 Analog Devices, Inc. All rights reserved.  
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