- 您现在的位置：买卖IC网 > PDF目录373901 > AD7482AST (ANALOG DEVICES INC) 3MSPS, 12-Bit SAR ADC PDF资料下载
参数资料
| 型号： | AD7482AST |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | 3MSPS, 12-Bit SAR ADC |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| 封装： | PLASTIC, MS-026BBC, LQFP-48 |
| 文件页数： | 6/16页 |
| 文件大小： | 1498K |
| 代理商： | AD7482AST |
REV. 0
–6–
AD7482
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The end-
points of the transfer function are zero scale, a point 1/2 LSB
below the first code transition, and full scale, a point 1/2 LSB
above the last code transition.
Differential Nonlinearity
This is the difference between the measured and ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal, i.e., AGND + 0.5 LSB.
Gain Error
This is the deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (i.e., V
REF
–
1.5 LSB) after the
offset error has been adjusted out.
Track-and-Hold Acquisition Time
Track-and-hold acquisition time is the time required for the
output of the track-and-hold amplifier to reach its final value,
within
±
1/2 LSB, after the end of conversion (the point at
which the track-and-hold returns to track mode).
Signal-to-(Noise + Distortion) Ratio
This is the measured ratio of signal-to-(noise + distortion) at
the output of the A/D converter. The signal is the rms amplitude
of the fundamental. Noise is the sum of all nonfundamental
signals up to half the sampling frequency (f
S
/2), excluding dc.
The ratio is dependent on the number of quantization levels in
the digitization process; the more levels, the smaller the quanti-
zation noise. The theoretical
signal-to-
(
noise + distortion
) ratio for
an ideal N-bit converter with a sine wave input is given by:
Signal to Noise
Thus, for a 12-bit converter this is 74
dB
.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum
of the harmonics to the fundamental. For the AD7482, it is
defined as:
Distortion
N
dB
+
=
+
(
)
(
)
.
.
6 02
1 76
where
V
is the rms amplitude of the fundamental and
V
,
V
3
,
V
4
,
V
5
, and
V
6
are the rms amplitudes of the second through the
sixth harmonics.
Peak Harmonic or Spurious Noise
Peak harmonic or spurious noise is defined as the ratio of the
rms value of the next largest component in the ADC output spec-
trum (up to f
S
/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is deter-
mined by the largest harmonic in the spectrum, but for ADCs
where the harmonics are buried in the noise floor, it will be a
noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa
±
nfb, where
m and n = 0, 1, 2, 3, and so on. Intermodulation distortion
terms are those for which neither m nor n are equal to zero.
For example, the second order terms include (fa + fb) and
(fa
–
fb), while the third order terms include (2fa + fb),
(2fa
–
fb), (fa + 2fb), and (fa
–
2fb).
The AD7482 is tested using the CCIF standard, where two
input frequencies near the top end of the input bandwidth are
used. In this case, the second order terms are usually distanced
in frequency from the original sine waves, while 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 sepa-
rately. 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
sum of the fundamentals expressed in dBs.
THD dB
V
V
V
V
V
V
(
)
log
=
+
+
+
+
20
2
2
3
2
4
2
5
2
6
2
1
相关PDF资料 |
PDF描述 |
|---|---|
| AD7482BST | 1.5Gbps Serial ATA-Compatible Mux/Buffer with Loopback and Equalization |
| AD7490 | 16-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 28-Lead TSSOP |
| AD7490BCP | 16-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 28-Lead TSSOP |
| AD7490BRU | 16-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 28-Lead TSSOP |
| AD7492 | Evaluation Board for 12-bit high speed, low power, successive-approximation ADC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7482ASTZ | 功能描述:IC ADC 12BIT SAR 3MSPS 48LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7482BST | 制造商:Analog Devices 功能描述:ADC Single SAR 3Msps 12-bit Parallel 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:12 BIT 3.5 MEG ADC IC - Tape and Reel 制造商:Analog Devices 功能描述:A/D Converter (A-D) IC |
| AD7482BSTZ | 功能描述:IC ADC 12BIT SAR 3MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD7484 | 制造商:AD 制造商全称:Analog Devices 功能描述:3MSPS, 14-Bit SAR ADC |
| AD7484BST | 制造商:Analog Devices 功能描述:ADC Single SAR 3Msps 14-bit Parallel 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:14 BIT 3.0 MEG ADC IC - Tape and Reel 制造商:Analog Devices 功能描述:A/D Converter (A-D) IC |
发布紧急采购，3分钟左右您将得到回复。