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參數(shù)資料
| 型號(hào)： | AD7870A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Complete, 12-Bit, 100 kHz , Sampling ADC(完備的,頻率為100kHz,12位A/D轉(zhuǎn)換器) |
| 中文描述： | 完整的，12位，100千赫采樣ADC（完備的，頻率為100kHz的12位的A / D轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 263K |
| 代理商： | AD7870A |
AD7870A
–9–
REV. 0
The timing diagram for byte and serial data is shown in Figure
10.
INT
goes low at the end of conversion and is reset high by
the first falling edge of
CS
and
RD
. This first read at the end of
conversion can either access the low byte or high byte of data
depending on the status of
HBEN
(Figure 10 shows low byte
only for example). The diagram shows both a noncontinuously
and a continuously running clock (dashed line).
AD7870A DYNAMIC SPECIFICATIONS
The AD7870A is specified and 100% tested for dynamic perfor-
mance specifications. These ac specifications are required for
signal processing applications such as speech recognition, spec-
trum analysis and high speed modems. These applications re-
quire information on the ADC’s effect on the spectral content
of the input signal. Hence, the parameters for which the AD7870A
is specified include SNR, harmonic distortion, intermodulation
distortion and peak harmonics. These terms are discussed in
more detail in the following sections.
Signal-to-Noise Ratio (SNR)
SNR is the measured signal-to-noise ratio at the output of the
ADC. The signal is the rms magnitude of the fundamental.
Noise is the rms sum of all the nonfundamental signals up to
half the sampling frequency (FS/2) excluding dc. SNR is depen-
dent upon the number of quantization levels used in the digiti-
zation process; the more levels, the smaller the quantization
noise. The theoretical signal-to-noise ratio for a sine wave input
is given by
SNR
=(6.02
N
+ 1.76)
dB
where
N
is the number of bits. Thus for an ideal 12-bit con-
verter,
SNR
= 74 dB.
(1)
Figure 10. Mode 1 Timing Diagram, Byte or Serial Read
The output spectrum from the ADC is evaluated by applying a
sine-wave signal of very low distortion to the V
IN
input which is
sampled at a 100 kHz sampling rate. A Fast Fourier Transform
(FFT) plot is generated from which the SNR data can be ob-
tained. Figure 11 shows a typical 2048 point FFT plot of the
AD7870AJN with an input signal of 25 kHz and a sampling
frequency of 100 kHz. The SNR obtained from this graph is
72.6 dB. It should be noted that the harmonics are taken into
account when calculating the SNR.
Figure 11. FFT Plot
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| AD7870CQ | LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs |
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| AD7870JP | LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7870AJN | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 12-bit Parallel/Serial 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:12-BIT SAMPLING ADC IC - Bulk |
| AD7870AJNZ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-DIP RoHS:是 類(lèi)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:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類(lèi)型:1 個(gè)單端，雙極 |
| AD7870AQ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:- |
| AD7870BQ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP RoHS:否 類(lèi)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:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類(lèi)型:1 個(gè)單端，雙極 |
| AD7870CQ | 功能描述:IC ADC 12BIT SAMPLING 3V 24-CDIP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類(lèi)型:2 個(gè)單端，單極 |
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