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參數(shù)資料
| 型號(hào)： | AD7655 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | Low Cost 4-Channel 1 MSPS 16-Bit ADC |
| 中文描述： | 低成本4通道1 MSPS的16位ADC |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 684K |
| 代理商： | AD7655 |
REV. 0
–8–
AD7655
PIN FUNCTION DESCRIPTIONS (continued)
Pin
Number
Mnemonic
Type
Description
34
PD
DI
Power-Down Input. When set to a logic HIGH, power consumption is reduced and conversions
are inhibited after the current one is completed.
Start Conversion. A falling edge on
CNVST
puts the internal sample/hold into the hold state and
initiates a conversion. In impulse mode (IMPULSE HIGH), if
CNVST
is held low when the
acquisition phase
(
t
8
) is complete, the internal sample/hold is put into the hold state and a
conversion is immediately started.
This input pin is used to provide a reference to the converter.
Reference Input Analog Ground
Analog Inputs
These inputs are the references applied to Channel A and Channel B, respectively.
Analog input ground senses. Allow to sense each channel ground independently.
Analog Inputs
35
CNVST
DI
37
38
39, 41
42, 43
40, 45
44, 46
REF
REFGND
INB1, INB2
REFB, REFA
INBN, INAN
INA2, INA1
AI
AI
AI
AI
AI
AI
NOTES
AI = Analog Input
DI = Digital Input
DI/O = Bidirectional Digital
DO = Digital Output
P = Power
DEFINITION OF SPECIFICATIONS
Integral Nonlinearity Error (INL)
Linearity error 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 1/2 LSB before the
first code transition. Positive full scale is defined as a level 1 1/2 LSB
beyond the last code transition. The deviation is measured from the
middle of each code to the true straight line.
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. Differential
nonlinearity is the maximum deviation from this ideal value. It
is often specified in terms of resolution for which no missing
codes are guaranteed.
Full-Scale Error
The last transition (from 111 . . . 10 to 111 . . . 11) should
occur for an analog voltage 1 1/2 LSB below the nominal full
scale (4.999886 V for the
0 V to
5 V range). The full-scale error
is the deviation of the actual level of the last transition from the
ideal level.
Unipolar Zero Error
In unipolar mode, the first transition should occur at a level 1/2
LSB above analog ground. The unipolar zero error is the devia-
tion of the actual transition from that point.
Spurious Free Dynamic Range (SFDR)
The difference, in decibels (dB), 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
S
/(
N
+
D
) by the following formula:
[
and is expressed in bits.
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.
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 (S/[N+D])
S/(N+D) 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 S/(N+D) is expressed in decibels.
Aperture Delay
Aperture delay is a measure of the acquisition performance and
is measured from the falling edge of the
CNVST
input to when
the input signals are held for a conversion.
Transient Response
The time required for the AD7655 to achieve its rated accuracy
after a full-scale step function is applied to its input.
ENOB
S
N
D
dB
=
+
]
(
)
)
/
–
.
1 76
/6 02
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