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參數(shù)資料
| 型號(hào)： | AD7818ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 279K |
| 描述： | IC ADC 10BIT W/TEMP SENSOR 8SOIC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部 |
| 感應(yīng)溫度： | -55°C ~ 125°C |
| 精確度： | ±2°C |
| 拓?fù)洌?/td> | ADC，多路復(fù)用器，寄存器庫 |
| 輸出類型： | MICROWIRE?，QSPI?，SPI? |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
REV. C
AD7816/AD7817/AD7818
9
PIN CONFIGURATIONS
SOIC/MSOP (AD7816)
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
AD7816
CONVST
D
IN/OUT
SCLK
RD/WR
V
DD
GND
REF
IN
OTI
SOIC/MSOP (AD7818)
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
AD7818
CONVST
D
IN/OUT
SCLK
RD/WR
V
DD
GND
V
IN
OTI
TERMINOLOGY
Signal-to-(Noise + Distortion) Ratio
This is the measured ratio of signal-to-(noise + distortion) at the
output of the A/D converter. The signal is the rms amplitude of
the fundamental. Noise is the rms sum of all nonfundamental
signals up to half the sampling frequency (f
S
/2), excluding dc.
The ratio is dependent upon the number of quantization levels in
the digitization process; the more levels, the smaller the quantiza-
tion noise. The theoretical signal-to-(noise + distortion) ratio for
an ideal N-bit converter with a sine wave input is given by:
Signal-to-(Noise + Distortion) = (6.02 N + 1.76) dB
Thus for a 10-bit converter, this is 62 dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7891 it is defined as:
THD (dB)=20 log
V
2
2
+V
3
2
+V
4
2
+V
5
2
+V
6
2
V
1
where V
1
is the rms amplitude of the fundamental and V
2
, V
3
,
V
4
, V
5
, and V
6
are the rms amplitudes of the second through the
sixth harmonics.
Peak Harmonic or Spurious Noise
Peak harmonic or spurious noise is defined as the ratio of the
rms value of the next largest component in the ADC output
spectrum (up to f
S
/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is deter-
mined by the largest harmonic in the spectrum, but for parts
where the harmonics are buried in the noise floor, it will be a
noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa nfb where
m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which
neither m nor n are equal to zero. For example, the second
order terms include (fa + fb) and (fa fb), while the third order
terms include (2fa + fb), (2fa fb), (fa + 2fb) and (fa 2fb).
AD7816 AND AD7818 PIN FUNCTION DESCRIPTIONS
Pin
Mnemonic
Description
1
CONVST
Logic Input Signal. The convert start signal initiates a 10-bit analog-to-digital conversion on the
falling edge of the this signal. The falling edge of this signal places the track/hold in hold mode.
The track/hold goes into track mode again at the end of the conversion. The state of the
CONVST signal is checked at the end of a conversion. If it is logic low, the AD7816 and
AD7818 will power downsee Operating Mode section of the data sheet.
2
OTI
Logic Output. The Overtemperature Indicator (OTI) is set logic low if the result of a conversion
on Channel 0 (Temperature Sensor) is greater that an 8-bit word in the Overtemperature Register
(OTR). The signal is reset at the end of a serial read operation, i.e., a rising RD/WR edge.
3
GND
Analog and Digital Ground.
4 (AD7818)
V
IN
Analog Input Channel. The input channel is single-ended with respect to GND. The input
channel can convert voltage signals in the range 0 V to 2.5 V. The input channel is selected by
writing to the Address Register of the AD7818see Control Byte section.
4 (AD7816)
REF
IN
Reference Input. An external 2.5 V reference can be connected to the AD7816 at this pin. To
enable the on-chip reference the REF
IN
pin should be tied to AGND. If an external reference is
connected to the AD7816, the internal reference will shut down.
5
V
DD
Positive supply voltage, 2.7 V to 5.5 V.
6
D
IN/OUT
Logic Input and Output. Serial data is clocked in and out of the AD7816/AD7818 at this pin.
7
SCLK
Clock Input for the Serial Port. The serial clock is used to clock data into and out of the
AD7816/AD7818. Data is clocked out on the falling edge and clocked in on the rising edge.
8
RD/WR
Logic Input. The read/write signal is used to indicate to the AD7816 and AD7818 whether
the next data transfer operation is a read or a write. The RD/WR should be set logic high for a
read operation and logic low for a write.
相關(guān)PDF資料 |
PDF描述 |
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| AD8210WYRZ-R7 | IC CURRENT MONITOR 0.5% 8SOIC |
| AD8211YRJZ-R2 | IC CURRENT MONITOR 0.25% SOT23-5 |
| AD8213WYRMZ | IC CURRENT MONITOR 0.25% 10MSOP |
| AD8214WYRMZ | IC CURRENT SHUNT COMP OUT 8MSOP |
| AD8215WYRZ | IC CURRENT MONITOR 0.15% 8SOIC |
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| AD7818ARZ-REEL7 | 功能描述:IC ADC 10BIT W/TEMP SENSOR 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| AD7819 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+2.7 V to +5.5 V, 200 kSPS 8-Bit Sampling ADC |
| AD7819YN | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Parallel 16-Pin PDIP 制造商:Analog Devices 功能描述:IC 8BIT ADC 7819 DIP16 |
| AD7819YNZ | 功能描述:IC ADC 8BIT SAMPLING PAR 16-DIP 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(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7819YR | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 8-bit Parallel 16-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:8 BIT,SINGLE,PARALLEL ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC SEMICONDUTOR ((NS)) |
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