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參數資料
| 型號： | AD7740YRM |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter |
| 中文描述： | VOLTAGE-FREQUENCY CONVERTER, 1 MHz, PDSO8 |
| 封裝： | MICRO, SOIC-8 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 144K |
| 代理商： | AD7740YRM |
FUNCTIONAL BLOCK DIAGRAM
BUF
VDD
CLKIN
AD7740
VIN
FOUT
2.5V
REFERENCE
VOLTAGE-TO-
FREQUENCY
MODULATOR
CLKOUT
GND
CLOCK
GENERATION
REFIN/OUT
X1
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.
a
AD7740
*
FEATURES
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
Low Power: 3 mW (Typ)
Nominal Input Range: 0 to V
REF
True –150 mV Capability Without Charge Pump
V
REF
Range: 2.5 V to VDD
Internal 2.5 V Reference
1 MHz Max Input Frequency
Selectable High Impedance Buffered Input
Minimal External Components Required
APPLICATIONS
Isolation of High Common-Mode Voltages
Low-Cost Analog-to-Digital Conversion
Battery Monitoring
Automotive Sensing
GENERAL DESCRIPTION
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.
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.
For an analog input signal that goes from 0 V to V
REF
, the out-
put frequency goes from 10% to 90% of f
CLKIN.
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.
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.
One Technology Way, PO. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
PRODUCT HIGHLIGHTS
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.
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.
5. The specified voltage reference range on REFIN is from
2.5 V to the supply voltage, VDD.
3 V/5 V Low Power, Synchronous
Voltage-to-Frequency Converter
*
Patents pending.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7741YR | Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
| AD7742YR | Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
| AD7741BN | Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
| AD7741BR | Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
| AD7742BN | Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7740YRM-REEL | 制造商:Analog Devices 功能描述:VFC Sync 1MHz 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:VFC SYNC 1MHZ 8MSOP - Tape and Reel |
| AD7740YRM-REEL7 | 功能描述:IC CONVERTER V TO FREQ 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - V/F 和 F/V 轉換器 系列:- 標準包裝:1 系列:- 類型:頻率至電壓 頻率 - 最大:10kHz 全量程:- 線性:±0.3% 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:Digi-Reel® 其它名稱:LM2917MX-8/NOPBDKR |
| AD7740YRMZ | 功能描述:IC CONVERTER VOLT TO FREQ 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - V/F 和 F/V 轉換器 系列:- 標準包裝:1 系列:- 類型:頻率至電壓 頻率 - 最大:10kHz 全量程:- 線性:±0.3% 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:Digi-Reel® 其它名稱:LM2917MX-8/NOPBDKR |
| AD7740YRMZ-REEL | 功能描述:IC CONVERTER VOLT TO FREQ 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - V/F 和 F/V 轉換器 系列:- 標準包裝:1 系列:- 類型:頻率至電壓 頻率 - 最大:10kHz 全量程:- 線性:±0.3% 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:Digi-Reel® 其它名稱:LM2917MX-8/NOPBDKR |
| AD7740YRMZ-REEL7 | 功能描述:IC CONVERTER VOLT TO FREQ 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - V/F 和 F/V 轉換器 系列:- 標準包裝:1 系列:- 類型:頻率至電壓 頻率 - 最大:10kHz 全量程:- 線性:±0.3% 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:Digi-Reel® 其它名稱:LM2917MX-8/NOPBDKR |
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