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參數資料
| 型號： | AD7893 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit 50 kSPS ADC Ser. Out, 1.8V Operation 8-MSOP |
| 中文描述： | LC2MOS 12位，串行ADC的6我們在8引腳封裝 |
| 文件頁數： | 11/12頁 |
| 文件大小： | 340K |
| 代理商： | AD7893 |
AD7893
–11–
REV. E
Effective Number of Bits
The formula for signal to (noise + distortion) ratio (see Termi-
nology section) is related to the resolution or number of bits in
the converter. Rewriting the formula gives a measure of perfor-
mance expressed in effective number of bits (N):
N = (SNR – 1.76) / 6.02
where
SNR
is Signal to (Noise + Distortion) Ratio.
The effective number of bits for a device can be calculated from
its measured signal to (noise + distortion) ratio. Figure 13 shows
a typical plot of effective number of bits versus frequency for the
AD7893-2 from dc to f
SAMPLING
/2. The sampling frequency is
102.4 kHz. The plot shows that the AD7893 converts an input
sine wave of 51.2 kHz to an effective numbers of bits of 11,
which equates to a signal to (noise + distortion) level of 68 dB.
INPUT FREQUENCY – kHz
12.0
11.5
10.00
51.2
25.6
E
11.0
10.5
Figure 13. Effective Number of Bits vs. Frequency
The same data is presented in Figure 11 as in Figure 10 except
that, in this case, the output data read for the device occurs dur-
ing conversion. This has the effect of injecting noise onto the die
while bit decisions are being made; this increases the noise gen-
erated by the AD7893. The histogram plot for 8192 conversions
of the same dc input now shows a larger spread of codes with
the rms noise for the AD7893-2 increasing to 210
μ
V. This ef-
fect will vary depending on where the serial clock edges appear
with respect to the bit trials of the conversion process. It is pos-
sible to achieve the same level of performance when reading
during conversion as when reading after conversion, depending
on the relationship of the serial dock edges to the bit trial points.
CODE
7500
7000
6500
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
(X–4)
(X–3)
O
0
(X–2)
(X–1)
(X+1)
(X+2)
(X+3)
(X+4)
X
SAMPLING
FREQUENCY = 102.4kHz
T
A
= +25
°
C
Figure 11. Histogram of 8192 Conversions with Read Dur-
ing Conversion
Dynamic Performance
With a combined conversion and acquisition time of 7.5
μ
s, the
AD7893 is ideal for wide bandwidth signal processing applica-
tions. These applications require information on the ADC’s
effect on the spectral content of the input signal. Signal to (noise
+ distortion) ratio, total harmonic distortion, peak harmonic or
spurious noise, and intermodulation distortion are all specified.
Figure 12 shows a typical FFT plot of a 10 kHz, 0 V to +2.5 V
input after being digitized by the AD7893-2, operating at a
102.4 kHz sampling rate. The signal to (noise + distortion)
ratio is 71.5 dB, and the total harmonic distortion is –83 dB.
FREQUENCY – kHz
SNR IS SIGNAL TO (NOISE AND DISTORTION) RATIO
0
–30
–180
0
51.2
25.6
S
–60
–80
–120
SAMPLE RATE = 102.4kHz
INPUT FREQUENCY = 10kHz
SNR = 71.5dB
T
A
= +25
°
C
Figure 12. AD7893 FFT Plot
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相關代理商/技術參數 |
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| AD7893ACHIPS-2 | 功能描述:12 Bit Analog to Digital Converter 1 Input 1 SAR Die 制造商:analog devices inc. 系列:- 包裝:管件 零件狀態:上次購買時間 位數:12 采樣率（每秒）:117k 輸入數:1 輸入類型:單端 數據接口:SPI 配置:S/H-ADC 無線電 - S/H:ADC:1:1 A/D 轉換器數:1 架構:SAR 參考類型:外部 電壓 - 電源，模擬:5V 電壓 - 電源，數字:5V 特性:- 工作溫度:-40°C ~ 85°C 封裝/外殼:模具 供應商器件封裝:模具 標準包裝:1 |
| AD7893ACHIPS-5 | 功能描述:12 Bit Analog to Digital Converter 1 Input 1 SAR Die 制造商:analog devices inc. 系列:- 包裝:托盤 - 晶粒 零件狀態:上次購買時間 位數:12 采樣率（每秒）:117k 輸入數:1 輸入類型:單端 數據接口:SPI 配置:S/H-ADC 無線電 - S/H:ADC:1:1 A/D 轉換器數:1 架構:SAR 參考類型:外部 電壓 - 電源，模擬:5V 電壓 - 電源，數字:5V 特性:- 工作溫度:-40°C ~ 85°C 封裝/外殼:模具 供應商器件封裝:模具 標準包裝:1 |
| AD7893AN-10 | 功能描述:IC ADC 12BIT SRL T/H LP 8-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目: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） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7893AN-10Z | 制造商:Analog Devices 功能描述:ADC 12BIT LC2MOS 1LSB 8DIP 制造商:Analog Devices 功能描述:ADC, 12BIT, LC2MOS, 1LSB, 8DIP; Resolution (Bits):12bit; Sampling Rate:117kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:9mA; Digital IC Case Style:DIP; No. of Pins:8; Input ;RoHS Compliant: Yes |
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