AD677KD

更新时间： 2024-02-08 23:32:00

品牌	Logo	应用领域
亚德诺 - ADI		转换器信息通信管理
页数	文件大小	规格书
16页	430K
描述
16-Bit 100 kSPS Sampling ADC

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AD677KD 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP28,.4	针数：	28
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.08
最大模拟输入电压：	10 V	最小模拟输入电压：	-10 V
转换器类型：	ADC, SUCCESSIVE APPROXIMATION	JESD-30 代码：	R-PDSO-G28
JESD-609代码：	e3	长度：	17.9 mm
最大线性误差 (EL)：	0.0023%	湿度敏感等级：	5
标称负供电电压：	-12 V	模拟输入通道数量：	1
位数：	16	功能数量：	1
端子数量：	28	最高工作温度：	70 °C
最低工作温度：		输出位码：	BINARY
输出格式：	SERIAL	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP28,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	5,+-12 V
认证状态：	Not Qualified	采样速率：	0.1 MHz
采样并保持/跟踪并保持：	SAMPLE	座面最大高度：	2.65 mm
子类别：	Analog to Digital Converters	标称供电电压：	12 V
表面贴装：	YES	技术：	BICMOS
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	7.5 mm	Base Number Matches：	1

AD677KD 数据手册

Definition of Specifications–AD677

NYQUIST FREQUENCY

INTERMODULATION DISTORTION (IMD)

An implication of the Nyquist sampling theorem, the “Nyquist

frequency’’ of a converter is that input frequency which is one

half the sampling frequency of the converter.

With inputs consisting of sine waves at two frequencies, fa and

fb, any device with nonlinearities will create distortion products,

of order (m+n), at sum and difference frequencies of mfa ± nfb,

where m, n = 0, 1, 2, 3 . . . . Intermodulation terms are those

for which m or n is not equal to zero. For example, the second

order terms are (fa + fb) and (fa – fb), and the third order terms

are (2 fa + fb), (2 fa – fb), (fa + 2 fb) and (fa – 2 fb). The IMD

products are expressed as the decibel ratio of the rms sum of the

measured input signals to the rms sum of the distortion terms.

The two signals applied to the converter are of equal amplitude,

and the peak value of their sum is –0.5 dB from full scale. The

IMD products are normalized to a 0 dB input signal.

TOTAL HARMONIC DISTORTION

Total harmonic distortion (THD) is the ratio of the rms sum of

the harmonic components to the rms value of a full-scale input

signal and is expressed in percent (%) or decibels (dB). For in-

put signals or harmonics that are above the Nyquist frequency,

the aliased components are used.

SIGNAL-TO-NOISE PLUS DISTORTION RATIO

Signal-to-noise plus distortion is defined to be the ratio of the

rms value of the measured input signal to the rms sum of all

other spectral components below the Nyquist frequency, includ-

ing harmonics but excluding dc.

APERTURE DELAY

Aperture delay is the time required after SAMPLE pin is taken

LOW for the internal sample-hold of the AD677 to open, thus

holding the value of V_IN.

+/– FULL-SCALE ERROR

The last + transition (from 011 . . . 10 to 011 . . . 11) should

occur for an analog voltage 1.5 LSB below the nominal full

scale (4.99977 volts for a ±5 V range). The full-scale error is

the deviation of the actual level of the last transition from the

ideal level.

APERTURE JITTER

Aperture jitter is the variation in the aperture delay from sample

to sample.

POWER SUPPLY REJECTION

DC variations in the power supply voltage will affect the overall

transfer function of the ADC, resulting in zero error and full-

scale error changes. Power supply rejection is the maximum

change in either the bipolar zero error or full-scale error value.

Additionally, there is another power supply variation to con-

sider. AC ripple on the power supplies can couple noise into the

ADC, resulting in degradation of dynamic performance. This is

displayed in Figure 15.

BIPOLAR ZERO ERROR

Bipolar zero error is the difference between the ideal midscale

input voltage (0 V) and the actual voltage producing the mid-

scale output code.

DIFFERENTIAL NONLINEARITY (DNL)

In an ideal ADC, code transitions are one LSB apart. Differen-

tial nonlinearity is the maximum deviation from this ideal value.

It is often specified in terms of resolution for which no missing

codes are guaranteed.

INPUT SETTLING TIME

Settling time is a function of the SHA’s ability to track fast

slewing signals. This is specified as the maximum time required

in track mode after a full-scale step input to guarantee rated

conversion accuracy.

INTEGRAL NONLINEARITY (INL)

The ideal transfer function for an ADC is a straight line bisect-

ing the center of each code drawn between “zero” and “full

scale.” The point used as “zero” occurs 1/2 LSB before the

most negative code transition. “Full scale” is defined as a level

1.5 LSB beyond the most positive code transition. Integral non-

linearity is the worst-case deviation of a code center average

from the straight line.

NOISE/DC CODE UNCERTAINTY

Ideally, a fixed dc input should result in the same output code

for repetitive conversions. However, as a consequence of un-

avoidable circuit noise within the wideband circuits in the ADC,

there is a range of output codes which may occur for a given in-

put voltage. If you apply a dc signal to the ADC and record a

large number of conversions, the result will be a distribution of

codes. If you fit a Gaussian probability distribution to the histo-

gram, the standard deviation is approximately equivalent to the

rms input noise of the ADC.

BANDWIDTH

The full-power bandwidth is that input frequency at which the

amplitude of the reconstructed fundamental is reduced by 3 dB

for a full-scale input.

REV. A

–7–

1...4 5 678 9 10...16

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