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參數(shù)資料
| 型號： | AD7894BR-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | SWITCH SLIDE SPDT .3A SMD |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 131K |
| 代理商： | AD7894BR-3 |
AD7894
–11–
REV. 0
Dynamic Performance (Mode 1 Only)
With a conversion time of 5
μ
s, the AD7894 is ideal for wide
bandwidth signal processing applications. These applications
require information on the ADC’s effect on the spectral con-
tent of the input signal. Signal to (Noise + Distortion), Total
Harmonic Distortion, Peak Harmonic or Spurious Noise and
Intermodulation Distortion are all specified. Figure 11 shows a
typical FFT plot of a 10 kHz,
±
10V input after being digitized
by the AD7894-10 operating at a 160 kHz sampling rate. The
signal to (noise + distortion) ratio is 80.24 dB and the total
harmonic distortion is –96.35 dB.
The formula for signal to (noise + distortion) ratio (see Ter-
minology section) is related to the resolution or number of bits
in the converter. Rewriting the formula, below, gives a mea-
sure of performance expressed in effective number of bits (N):
N
=
(
SNR
–1.76)
6.02
where
SNR
is Signal to (Noise + Distortion) Ratio.
FREQUENCY – kHz
0
–1400
80
10
d
20
30
40
50
60
70
–20
–60
–80
–100
–120
–40
f
S
= 160kHz
F
= 10kHz
SNR = 80.24dB
THD = –96.35dB
Figure 11. AD7894 FFT Plot
The effective number of bits for a device can be calculated from
its measured signal to (noise + distortion) ratio. Figure 12
shows a typical plot of effective number of bits versus frequency
for the AD7894 from dc to f
SAMPLING
/2. The sampling fre-
quency is 160 kHz. The plot shows that the AD7894 converts
an input sine wave of 10kHz to an effective numbers of bits of
13.00, which equates to a signal to (noise + distortion) level of
80.02 dB.
FREQUENCY – kHz
14
13
9
10
1000
100
E
12
11
10
Figure 12. Effective Number of Bits vs. Frequency
Power Considerations
In the automatic power-down mode the part may be operated at
a sample rate that is considerably less than 160 kHz. In this
case, the power consumption will be reduced and will depend
on the sample rate. Figure 13 shows a graph of the power con-
sumption versus sampling rates from 1 Hz to 100 kHz in the
automatic power-down mode. The conditions are 5 V supply
+25
°
C. The SCLK pin was held low and no data was read from
the part.
SAMPLING FREQUENCY – Hz
100
0.11
100000
10
P
100
1000
10000
10
1
Figure 13. Power vs. Sampling Rate in Automatic Power-
Down Mode
82
81
78
–40
80
–20
0
20
40
60
80
79
f
S
= 160kHz
F
IN
= 10kHz
TEMPERATURE –
8
C
S
Figure 14. SNR + D vs. Temperature
FREQUENCY – kHz
100
80
10
1000
100
T
90
70
60
50
40
30
20
10
0
Figure 15. THD vs. Frequency
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7894BR-3REEL | 功能描述:IC ADC 14BIT SRL T/H LP 8-SOIC 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 |
| AD7894BR-3REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N T/R |
| AD7894BRZ-10 | 功能描述:IC ADC 14BIT SRL T/H LP 8-SOIC 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 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7894BRZ-10REEL | 功能描述:IC ADC 14BIT SRL T/H LP 8SOIC 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 |
| AD7894BRZ-10REEL7 | 功能描述:IC ADC 14BIT SRL T/H LP 8SOIC 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 |
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