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參數資料
| 型號： | AD7893SQ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Power Quad Comparators with Reference; Package: SO; No of Pins: 16; Temperature Range: -40°C to +85°C |
| 中文描述： | 立法會2馬鞍山12位串行ADC的6百萬分之一在8引腳封裝（340.73十一） |
| 文件頁數： | 11/12頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AD7893SQ |
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
相關PDF資料 |
PDF描述 |
|---|---|
| AD7893AR-2 | RECTIFIER SCHOTTKY DUAL COMMON-CATHODE 30A 30V 260A-Ifsm 0.57Vf 1A-IR TO-220AB 50/TUBE |
| AD7893AR-3 | RECTIFIER SCHOTTKY DUAL 40A 45V 375A-ifsm 0.58V-vf 1mA-ir TO-3P 30/TUBE |
| AD7893AR-5 | RECTIFIER SCHOTTKY SINGLE 5A 35V 175A-ifsm 0.55V-vf 0.5mA-ir TO220AC 50/TUBE |
| AD7893BN-10 | DIODE ZENER SINGLE 200mW 8.2Vz 5mA-Izt 0.0208 0.5uA-Ir 5 SOD-323 3K/REEL |
| AD7893BN-2 | DIODE ZENER SINGLE 200mW 9.1Vz 5mA-Izt 0.021 0.5uA-Ir 6 SOD-323 3K/REEL |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7893SQ-10 | 功能描述:模數轉換器 - ADC Bipolar Input SGL Spply 12B Serial 6uS RoHS:否 制造商:Analog Devices 通道數量: 結構: 轉換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風格: 封裝 / 箱體: |
| AD7893SQ-2 | 制造商:Rochester Electronics LLC 功能描述:12-BIT ADC,8 PIN PACKAGE - Bulk 制造商:Analog Devices 功能描述: |
| AD7893SQ-5 | 制造商:Analog Devices 功能描述:ADC SGL SAR 117KSPS 12-BIT SERL 8CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC ADC 12BIT SRL T/H LP 8-CDIP 制造商:Analog Devices 功能描述:12-BIT ADC 8-PIN I.C. 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD7894AR-10 | 功能描述:IC ADC 14BIT SRL T/H LP 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目: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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7894AR-10REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 14BIT SERL 8SOIC N - Tape and Reel |
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