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AD7740YRM PDF预览

AD7740YRM

更新时间: 2024-01-28 08:27:21
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
11页 145K
描述
3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter

AD7740YRM 技术参数

是否无铅: 不含铅是否Rohs认证: 不符合
生命周期:Obsolete零件包装代码:SOT-23
包装说明:LSSOP, TSSOP8(UNSPEC)针数:8
Reach Compliance Code:not_compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.71
其他特性:CAN ALSO OPERATE FROM 4.75V TO 5.25V SUPPLY转换器类型:VOLTAGE TO FREQUENCY CONVERTER
JESD-30 代码:R-PDSO-G8JESD-609代码:e0
长度:2.95 mm最大线性误差 (EL):0.018%
湿度敏感等级:1功能数量:1
端子数量:8最大工作频率:1 MHz
最高工作温度:105 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:LSSOP
封装等效代码:TSSOP8(UNSPEC)封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, LOW PROFILE, SHRINK PITCH峰值回流温度(摄氏度):NOT SPECIFIED
最大正输入电压:3.1 V电源:3.3/5 V
认证状态:Not Qualified座面最大高度:1.45 mm
子类别:Analog Special Function Converters最大压摆率:1.5 mA
最大供电电压:3.6 V最小供电电压:3 V
标称供电电压:3.3 V表面贴装:YES
技术:CMOS温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn85Pb15)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:NOT SPECIFIED宽度:1.65 mm

AD7740YRM 数据手册

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3 V/5 V Low Power, Synchronous  
Voltage-to-Frequency Converter  
a
AD7740*  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Synchronous Operation  
Full-Scale Frequency Set by External System Clock  
8-Lead SOT-23 and 8-Lead microSOIC Packages  
3 V or 5 V Operation  
REFIN/OUT  
VDD  
AD7740  
2.5V  
REFERENCE  
Low Power: 3 mW (Typ)  
Nominal Input Range: 0 to VREF  
True –150 mV Capability Without Charge Pump  
VREF Range: 2.5 V to VDD  
Internal 2.5 V Reference  
1 MHz Max Input Frequency  
VOLTAGE-TO-  
FREQUENCY  
MODULATOR  
X1  
VIN  
FOUT  
Selectable High Impedance Buffered Input  
Minimal External Components Required  
CLOCK  
GENERATION  
APPLICATIONS  
Isolation of High Common-Mode Voltages  
Low-Cost Analog-to-Digital Conversion  
Battery Monitoring  
BUF  
CLKOUT  
CLKIN  
GND  
Automotive Sensing  
GENERAL DESCRIPTION  
PRODUCT HIGHLIGHTS  
The AD7740 is a low-cost, ultrasmall synchronous Voltage-to-  
Frequency Converter (VFC). It works from a single 3.0 V to  
3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740  
is available in an 8-lead SOT-23 and also in an 8-lead microSOIC  
package. Small package, low cost and ease of use were major  
design goals for this product. The part contains an on-chip 2.5 V  
bandgap reference but the user may overdrive this using an  
external reference. This external reference range includes VDD.  
1. The AD7740 is a single channel, single-ended VFC. It is  
available in 8-lead SOT-23 and 8-lead microSOIC packages,  
and is intended for low-cost applications. The AD7740 offers  
considerable space saving over alternative solutions.  
2. The AD7740 operates from a single 3.0 V to 3.6 V or 4.75 V  
to 5.25 V supply and consumes typically 0.9 mA when the  
input is unbuffered. It also contains an automatic power-down  
function.  
The full-scale output frequency is synchronous with the clock  
signal on the CLKIN pin. This clock can be generated with the  
addition of an external crystal (or resonator) or supplied from a  
CMOS-compatible clock source. The part has a maximum  
input frequency of 1 MHz.  
3. The AD7740 does not require external resistors and capaci-  
tors to set the output frequency. The maximum output  
frequency is set by a crystal or a clock. No trimming or cali-  
bration is required.  
4. The analog input can be taken to 150 mV below GND for  
true bipolar operation.  
For an analog input signal that goes from 0 V to VREF, the out-  
put frequency goes from 10% to 90% of fCLKIN. In buffered mode,  
the part provides a very high input impedance and accepts a  
range of 0.1 V to VDD – 0.2 V on the VIN pin. There is also  
an unbuffered mode of operation that allows VIN to go from  
–0.15 V to VDD + 0.15 V. The modes are interchangeable using  
the BUF pin.  
5. The specified voltage reference range on REFIN is from  
2.5 V to the supply voltage, VDD.  
The AD7740 (Y Grade) is guaranteed over the automotive  
temperature range of –40°C to +105°C. The AD7740 (K Grade)  
is guaranteed from 0°C to 85°C.  
*Patents pending.  
REV. 0  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which 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  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 2000  

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