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| 型号： | AD7699BCPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8CH 16BIT 500KSPS 20LFCSP |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 32mW |
| 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： | 20-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-VQ |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极；4 个差分，双极；4 个伪差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
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AD7699
Data Sheet
Rev.
| Page 12 of 28
TERMINOLOGY
Least Significant Bit (LSB)
The LSB is the smallest increment that can be represented by a
converter. For an analog-to-digital converter with N bits of
resolution, the LSB expressed in volts is
N
REF
V
LSB
2
(V) =
Integral Nonlinearity Error (INL)
INL refers to the deviation of each individual code from a line
drawn from negative full scale through positive full scale. The
point used as negative full scale occurs LSB before the first
code transition. Positive full scale is defined as a level 1 LSB
beyond the last code transition. The deviation is measured from
the middle of each code to the true straight line (see Figure 26).
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. DNL is the
maximum deviation from this ideal value. It is often specified in
terms of resolution for which no missing codes are guaranteed.
Offset Error
For unipolar mode, the first transition should occur at a level
LSB above analog ground. The unipolar offset error is the
deviation of the actual transition from that point. For bipolar
mode, the first transition should occur at a level LSB above
VREF/2. The bipolar offset error is the deviation of the actual
transition from that point.
Gain Error
The last transition (from 111 … 10 to 111 … 11) should occur
for an analog voltage 1 LSB below the nominal full scale. The
gain error is the deviation in LSB (or percentage of full-scale
range) of the actual level of the last transition from the ideal
level after the offset error is adjusted out. Closely related is the
full-scale error (also in LSB or percentage of full-scale range),
which includes the effects of the offset error.
Aperture Delay
Aperture delay is the measure of the acquisition performance. It
is the time between the rising edge of the CNV input and the
point at which the input signal is held for a conversion.
Transient Response
Transient response is the time required for the ADC to accurately
acquire its input after a full-scale step function is applied.
Dynamic Range
Dynamic range is the ratio of the rms value of the full scale to
the total rms noise measured with the inputs shorted together.
The value for dynamic range is expressed in decibels.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the actual input signal to the
rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in decibels.
Signal-to-(Noise + Distortion) Ratio (SINAD)
SINAD is the ratio of the rms value of the actual input signal to
the rms sum of all other spectral components below the Nyquist
frequency, including harmonics but excluding dc. The value for
SINAD is expressed in decibels.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first five harmonic
components to the rms value of a full-scale input signal and is
expressed in decibels.
Spurious-Free Dynamic Range (SFDR)
SFDR is the difference, in decibels, between the rms amplitude
of the input signal and the peak spurious signal.
Effective Number of Bits (ENOB)
ENOB is a measurement of the resolution with a sine wave
input. It is related to SINAD by the formula
ENOB
= (SINADdB 1.76)/6.02
and is expressed in bits.
Channel-to-Channel Crosstalk
Channel-to-channel crosstalk is a measure of the level of crosstalk
between any two adjacent channels. It is measured by applying a
dc to the channel under test and applying a full-scale, 100 kHz
sine wave signal to the adjacent channel(s). The crosstalk is the
amount of signal that leaks into the test channel and is expressed
in decibels.
Reference Voltage Temperature Coefficient
Reference voltage temperature coefficient is derived from the
typical shift of output voltage at 25°C on a sample of parts at the
maximum and minimum reference output voltage (VREF) meas-
ured at TMIN, T (25°C), and TMAX. It is expressed in ppm/°C as
6
10
)
–
(
)
C
25
(
)
(
–
)
(
)
C
ppm/
(
×
°
=
°
MIN
MAX
REF
T
V
Min
V
Max
V
TCV
where:
VREF
(Max) = maximum VREF at TMIN, T (25°C), or TMAX.
VREF
(Min) = minimum VREF at TMIN, T (25°C), or TMAX.
VREF
(25°C) = VREF at 25°C.
TMAX
= +85°C.
TMIN
= –40°C.
B
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