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參數(shù)資料
| 型號： | AD7864ASZ-2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT PAR 520K 4CH 44MQFP |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 520k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 120mW |
| 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： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 4 個差分，單極 |
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AD7864
Rev. D | Page 22 of 28
terms include (fa + fb) and (fa fb), whereas the third-order
terms include (2fa + fb), (2fa fb), (fa + 2fb), and (fa 2fb).
Using the CCIF standard where two input frequencies near the
top end of the input bandwidth are used, the second- and third-
order terms are of different significance. The second-order
terms are usually distanced in frequency from the original sine
waves, whereas the third-order terms are usually at a frequency
close to the input frequencies. As a result, the second- and
third-order terms are specified separately. The calculation of the
intermodulation distortion is as per the THD specification
where it is the ratio of the rms sum of the individual distortion
products to the rms amplitude of the fundamental expressed in
decibels. In this case, the input consists of two, equal amplitude,
low distortion sine waves. Figure 19 shows a typical IMD plot
for the AD7864.
010
20
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
30
FREQUENCY (kHz)
(dB
)
40
60
50
AD7864-1 @ 25°C
5V SUPPLY
SAMPLING AT 131072Hz
INPUT FREQUENCY OF
48,928Hz AND 50,016Hz
4096 SAMPLES TAKEN
0
13
41
-01
9
Figure 19. IMD Plot
AC LINEARITY PLOTS
and INL plots for the AD7864.
0
500
1000
1500
2000
2500
3000
3500
ADC CODE
3
2
1
0
–1
–2
–3
DN
L
(
L
S
B)
4000
01
34
1-
02
0
Figure 20. Typical DNL Plot
–0.5
0
0.5
1.0
1.5
2.0
2.5
–2.5
–2.0
–1.5
–1.0
0
500
1000
1500
2000
2500
3000
3500
4000
ADC CODE
IN
L
(
L
S
B
)
0
13
41
-02
1
Figure 21. Typical INL Plot
MEASURING APERTURE JITTER
A convenient way to measure aperture jitter is to use the
relationship it is known to have with SNR (signal-to-noise plus
distortion) given as follows:
(
)
×
=
σ
f
π
SNR
IN
JITTER
2
1
log
20
10
(3)
where:
SNRJITTER is the signal-to-noise due to the rms time jitter.
σ is the rms time jitter.
fIN is the sinusoidal input frequency (1 MHz in this case).
Equation 3 demonstrates that the signal-to-noise ratio due to
jitter degrades significantly with frequency. At low input fre-
quencies, the measured SNR performance of the AD7864 is
indicative of noise performance due to quantization noise and
system noise only (72 dB used as a typical figure in this example).
Therefore, by measuring the overall SNR performance
(including noise due to jitter, system, and quantization) of the
AD7864, a good estimation of the jitter performance of the
AD7864 can be calculated.
FREQUENCY (Hz)
12
11
5
9
8
7
6
10
EN
O
B
900k
950k
1.00M
1.05M
1.10M
01
34
1-
02
2
Figure 22. ENOB of the AD7864 at 1 MHz
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參數(shù)描述 |
|---|---|
| AD7864ASZ-22 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-2REEL | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7864ASZ-2REEL2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-3 | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP 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 標準包裝: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 |
| AD7864ASZ-32 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
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