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參數(shù)資料
型號(hào): AD7876
廠商: Analog Devices, Inc.
英文描述: Complete, 12-Bit, 100 kHz, Sampling ADCs(LC2MOS 12位100kHz采樣A/D轉(zhuǎn)換器)
中文描述: 完整的,12位,100千赫采樣ADC(LC2MOS 12位100kHz的采樣的A / D轉(zhuǎn)換器)
文件頁(yè)數(shù): 11/20頁(yè)
文件大小: 346K
代理商: AD7876
REV. B
2
AD7870/AD7875/AD7876
–11–
Figure 12. Mode 2 Timing Diagram, Byte or Serial Read
T he Mode 2 timing diagram for byte and serial data is shown in
Figure 12. For two-byte data read, the lower byte (DB0–DB7)
has to be accessed first since HBEN must be low to start con-
version. T he ADC behaves like slow memory for this first read,
but the second read to access the upper byte of data is a normal
read. Operation of the serial functions is identical between
Mode 1 and Mode 2. T he timing diagram of Figure 12 shows
both a noncontinuously and a continuously running SCLK
(dashed line).
DY NAMIC SPE CIFICAT IONS
T he AD7870 and AD7875 are specified and 100% tested for
dynamic performance specifications as well as traditional dc
specifications such as integral and differential nonlinearity. Al-
though the AD7876 is not production tested for ac parameters,
its dynamic performance is similar to the AD7870 and AD7875.
T he ac specifications are required for signal processing applica-
tions such as speech recognition, spectrum analysis and high
speed modems. T hese applications require information on the
ADC’s effect on the spectral content of the input signal. Hence,
the parameters for which the AD7870 and AD7875 are speci-
fied include SNR, harmonic distortion, intermodulation distor-
tion and peak harmonics. T hese 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. T he 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. T he theoretical signal-to-noise ratio for a sine wave input
is given by
SNR
= (6.02
N
+ 1.76)
dB
(1)
where
N
is the number of bits. T hus for an ideal 12-bit con-
verter,
SNR
= 74 dB.
sine-wave signal of very low distortion to the V
IN
input which is
sampled at a 100 kHz sampling rate. A Fast Fourier T ransform
(FFT ) plot is generated from which the SNR data can be ob-
tained. Figure 13 shows a typical 2048 point FFT plot of the
AD7870K N/AD7875K N with an input signal of 25 kHz and a
sampling frequency of 100 kHz. T he 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 13. FFT Plot
E ffective Number of Bits
T he formula given in (1) relates SNR to the number of bits.
Rewriting the formula, as in (2), it is possible to get a measure
of performance expressed in effective number of bits (N).
N
=
SNR –
1.76
6.02
(2)
T he effective number of bits for a device can be calculated di-
rectly from its measured SNR.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7876BN 功能描述:IC ADC 12BIT SAMPLING 10V 24-DIP RoHS:否 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:- 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)目和類型:1 個(gè)單端,雙極
AD7876BNZ 功能描述:IC ADC 12BIT SAMPLING 10V 24DIP 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(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD7876BNZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs
AD7876BQ 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 12-bit Parallel/Serial 24-Pin CDIP 制造商:Rochester Electronics LLC 功能描述:12-BIT SAMPLING ADC IC - Bulk
AD7876BR 功能描述:IC ADC 12BIT SAMPLING 10V 24SOIC RoHS:否 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:- 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)目和類型:1 個(gè)單端,雙極
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