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參數(shù)資料
| 型號： | AD7821KR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function |
| 中文描述： | 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20 |
| 封裝： | MS-013AC, SOIC-20 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 249K |
| 代理商： | AD7821KR |
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, 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
LC
2
MOS Hgh Speed,
m
P-Compatible
8-Bit ADC wth Track/Hold Function
AD7821
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAM
FEATURES
Fast Conversion Time: 660 ns max
100 kHz Track-and-Hold Function
1 MHz Sample Rate
Unipolar and Bipolar Input Ranges
Ratiometric Reference Inputs
No External Clock
Extended Temperature Range Operation
Skinny 20-Pin DlPs, SOIC and 20-Terminal
Surface Mount Packages
GE NE RAL DE SCRIPT ION
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
μ
s 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 V
SS
pin (Pin 19) allows the
part to operate from
±
5 V supplies and to digitize bipolar input
signals. Alternatively, for unipolar inputs, the V
SS
pin can be
grounded and the AD7821 will operate from a single +5 V sup-
ply, like the AD7820.
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 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 fabricated in Linear-Compatible CMOS
(LC
2
MOS), 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.
PRODUCT HIGHLIGHT S
1. Fast Conversion T ime
T he half-flash conversion technique, coupled with fabrication
on Analog Devices’ LC
2
MOS 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/
μ
s 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 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 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.
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7821KR-REEL | 制造商:Analog Devices 功能描述:ADC Single Semiflash 1Msps 8-bit Parallel 20-Pin SOIC W T/R |
| AD7821KRZ | 功能描述:IC ADC 8BIT HS TRACK/HOLD 20SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7821KRZ | 制造商:Analog Devices 功能描述:IC, ADC, 8BIT, 1MHZ, SOIC-20 |
| AD7821KRZ-REEL | 功能描述:IC ADC 8BIT HS TRACK/HOLD 20SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7821TE | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function |
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