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AD7821KN PDF预览

AD7821KN

更新时间: 2024-11-06 22:53:31
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
12页 251K
描述
LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function

AD7821KN 数据手册

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2
LC MOS High Speed, P-Compatible  
a
8-Bit ADC with Track/Hold Function  
AD7821  
FEATURES  
FUNCTIO NAL BLO CK D IAGRAM  
Fast Conversion Tim e: 660 ns m ax  
100 kHz Track-and-Hold Function  
1 MHz Sam ple Rate  
Unipolar and Bipolar Input Ranges  
Ratiom etric Reference Inputs  
No External Clock  
Extended Tem perature Range Operation  
Skinny 20-Pin DlPs, SOIC and 20-Term inal  
Surface Mount Packages  
GENERAL D ESCRIP TIO N  
P RO D UCT H IGH LIGH TS  
T he AD7821 is a high speed, 8-bit, sampling, analog-to-digital  
converter that offers improved performance over the popular  
AD7820. It offers a conversion time of 660 ns (vs. 1.36 µs for  
the AD7820) and 100 kHz signal bandwidth (vs. 6.4 kHz). T he  
sampling instant is better defined and occurs on the falling edge  
of WR or RD. T he provision of a VSS pin (Pin 19) allows the  
part to operate from ±5 V supplies and to digitize bipolar input  
signals. Alternatively, for unipolar inputs, the VSS pin can be  
grounded and the AD7821 will operate from a single +5 V sup-  
ply, like the AD7820.  
1. Fast Conversion T ime  
T he half-flash conversion technique, coupled with fabrication  
on Analog Devices’ LC2MOS process, enables a very fast con-  
version time. T he conversion time for the WR-RD mode is  
660 ns, with 700 ns for the RD mode.  
2. Built-In T rack-and-Hold  
T his allows input signals with slew rates up to 1.6 V/µs to be  
converted to 8-bits without an external track-and-hold. T his  
corresponds to a 5 V peak-to-peak, 100 kHz sine wave signal.  
3. T otal Unadjusted Error  
T he AD7821 has a built-in track-and-hold function capable of  
digitizing full-scale signals up to 100 kHz max. It also uses a  
half-flash conversion technique that eliminates the need to gen-  
erate a CLK signal for the ADC.  
T he AD7821 features an excellent total unadjusted error fig-  
ure of less than ±1 LSB over the full operating temperature  
range.  
4. Unipolar/Bipolar Input Ranges  
T he AD7821 is designed with standard microprocessor control  
signals (CS, RD, WR, RDY, INT) and latched, three-state data  
outputs capable of interfacing to high speed data buses. An  
overflow output (OFL) is also provided for cascading devices to  
achieve higher resolution.  
T he AD7821 is specified for single supply (+5 V) operation  
with a unipolar full-scale range of 0 to +5 V, and for dual sup-  
ply (±5 V) operation with a bipolar input range of ±2.5 V.  
T ypical performance characteristics are given for other input  
ranges.  
T he AD7821 is fabricated in Linear-Compatible CMOS  
(LC2MOS), an advanced, mixed technology process combining  
precision bipolar circuits with low power CMOS logic. T he part  
features a low power dissipation of 50 mW.  
5. Dynamic Specifications for DSP Users  
In addition to the traditional ADC specifications, the  
AD7821 is specified for ac parameters, including signal-to-  
noise ratio, distortion and slew rate.  
REV. A  
Inform ation furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assum ed by Analog Devices for its  
use, nor for any infringem ents of patents or other rights of third parties  
which m ay result from its use. No license is granted by im plication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 617/ 329-4700  
Fax: 617/ 326-8703  

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