AD7821KP

更新时间： 2024-02-09 02:11:08

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

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技术参数
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AD7821KP 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	20
Reach Compliance Code：	unknown	风险等级：	5.69
最大模拟输入电压：	2.5 V	最小模拟输入电压：	-2.5 V
最长转换时间：	0.66 µs	转换器类型：	ADC, FLASH METHOD
JESD-30 代码：	R-GDIP-T20	JESD-609代码：	e0
最大线性误差 (EL)：	0.39%	湿度敏感等级：	NOT APPLICABLE
标称负供电电压：	-5 V	模拟输入通道数量：	1
位数：	8	功能数量：	1
端子数量：	20	最高工作温度：	125 °C
最低工作温度：	-55 °C	输出位码：	BINARY, OFFSET BINARY
输出格式：	PARALLEL, 8 BITS	封装主体材料：	CERAMIC, GLASS-SEALED
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT APPLICABLE
采样速率：	1 MHz	采样并保持/跟踪并保持：	TRACK
座面最大高度：	5.08 mm	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
温度等级：	MILITARY	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT APPLICABLE
宽度：	7.62 mm	Base Number Matches：	1

AD7821KP 数据手册

AD7821

ABSO LUTE MAXIMUM RATINGS*

Industrial (B Version) . . . . . . . . . . . . . . . . –40°C to +85°C

Extended (T Version) . . . . . . . . . . . . . . . –55°C to +125°C

Storage T emperature Range . . . . . . . . . . . . –65°C to +150°C

Lead T emperature (Soldering, 10 secs) . . . . . . . . . . . +300°C

Power Dissipation (Any Package) to +75°C . . . . . . . . 450 mW

Derates above +75°C by . . . . . . . . . . . . . . . . . . . . . 6 mW/°C

V_DDto GND . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V, + 7 V

V_SSto GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V, + 7 V

Digital Input Voltage to GND

(Pins 6–8, 13) . . . . . . . . . . . . . . . . . . . –0.3 V, V_DD+ 0.3 V

Digital Output Voltage to GND

(Pins 2–5, 9, 14–18) . . . . . . . . . . . . . . . –0.3 V, V_DD+ 0.3 V

_REF(+) to GND . . . . . . . . . . . . . . . V_SS– 0.3 V, V_DD+ 0.3 V

_REF(–) to GND . . . . . . . . . . . . . . . V_SS– 0.3 V, V_DD+ 0.3 V

V_INto GND . . . . . . . . . . . . . . . . . . . V_SS– 0.3 V, V_DD+ 0.3 V

Operating T emperature Range

*Stresses above those listed under “Absolute Maximum Ratings” may cause

permanent damage to the device. T his is a stress rating only and functional

operation of the device at these or any other conditions above those indicated in the

operational sections of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

Commercial (K Version) . . . . . . . . . . . . . . –40°C to +85°C

CAUTIO N

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD7821 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. T herefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

P IN CO NFIGURATIO NS

D IP AND SO IC

LCCC

P LCC

TERMINO LO GY

LEAST SIGNIFICANT BIT (LSB)

INTERMO D ULATIO N D ISTO RTIO N

With inputs consisting of sine waves at two frequencies, fa and

fb, any active device with nonlinearities will create distortion

products, of order (m+n), at sum and difference frequencies of

mfa+nfb, where m, n = 0, 1, 2, 3,- - - -. Intermodulation terms

are those for which m or n is not equal to zero. For example, the

second order terms include (fa + fb) and (fa – fb), and the third

order terms include (2fa + fb), (2fa – fb), (fa + 2fb) and

An ADC with 8-bit resolution can resolve one part in 2⁸(1/256

of full scale). For the AD7821 operating in either the unipolar

or bipolar input range with 5 V full scale, one LSB is 19.53 mV.

TO TAL UNAD JUSTED ERRO R

T his is a comprehensive specification which includes relative

accuracy, offset error and full-scale error.

(fa – 2fb). For the AD7821 intermodulation distortion is calcu-

lated separately for both the second and third order terms.

SLEW RATE

Slew Rate is the maximum allowable rate of change of input

signal such that the digital sample values are not in error.

SIGNAL-TO -NO ISE RATIO

Signal-to-noise ratio (SNR) is measured signal-to-noise at the

output of the ADC. T he signal is the rms magnitude of the fun-

damental. Noise is the rms sum of all nonfundamental signals

(excluding dc) up to half the sampling frequency. SNR is de-

pendent on the number of quantization levels used in the digiti-

zation process. T he theoretical SNR for a sine wave input is

TO TAL H ARMO NIC D ISTO RTIO N

T otal harmonic distortion is the ratio of the square root of the

sum of the squares of the rms value of the harmonics to the rms

value of the fundamental. For the AD7821, total harmonic dis-

tortion (T HD) is defined as

given by:

SNR = (6.02 N + 1.76) dB

V₂²+V₃²+V₅²+V₆

where N is the number of bits in the ADC. T hus, for an ideal

8-bit ADC, SNR = 50 dB.

(

)

20 log

V₁

P EAK H ARMO NIC O R SP URIO US NO ISE

Peak harmonic or spurious noise is the rms value of the largest

nonfundamental frequency (excluding dc) up to half the sam-

pling frequency to the rms value of the fundamental.

where V₁is the rms amplitude of the fundamental and V₂, V₃,

V₄, V₅, V₆, are the rms amplitudes of the individual harmonics.

–4–

REV. A

1 2 345 6 7...12

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AD7821KP 替代型号

型号	品牌	替代类型	描述	数据表
AD7821KPZ-REEL	ADI	完全替代	High Speed, µP-Compatible, CMOS, 8-Bit Sampling ADC

与AD7821KP相关器件

型号	品牌	描述	获取价格	数据表
AD7821KPZ	ADI	LC2MOS High Speed, P Compatible 8-Bit ADC with Track/Hold Function	获取价格
AD7821KPZ-REEL	ADI	High Speed, µP-Compatible, CMOS, 8-Bit Sampling ADC	获取价格
AD7821KR	ADI	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function	获取价格
AD7821KRZ-REEL	ADI	暂无描述	获取价格
AD7821TE	ADI	LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function	获取价格
AD7821TE/883B	ETC	Analog-to-Digital Converter， 8-Bit	获取价格

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