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參數資料
| 型號： | AD7677 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 1 LSB INL, 1 MSPS Differential ADC |
| 中文描述： | 16位，1 LSB INL和1 MSPS的差分ADC |
| 文件頁數： | 8/20頁 |
| 文件大小： | 322K |
| 代理商： | AD7677 |
REV. 0
AD7677
–8–
DEFINITION OF SPECIFICATIONS
INTEGRAL NONLINEARITY ERROR (INL)
Linearity error refers to the deviation of each individual code from
a best-fit 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.
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 011 . . . 10 to 011 . . . 11 in two’s
complement coding) should occur for an analog voltage 1 1/2 LSB
below the nominal +full scale (2.499886 V for the
±
2.5 V range).
The +full-scale error is the deviation of the actual level of the
last transition from the ideal level.
–FULL-SCALE ERROR
The first transition (from 100 . . . 00 to 100 . . . 01 in two’s
complement coding) should occur for an analog voltage 1/2 LSB
above the nominal –full scale (–2.499962 V for the
±
2.5 V range).
The –full-scale error is the deviation of the actual level of the
first transition from the ideal level.
ZERO ERROR
The zero error is the difference between the ideal midscale input
voltage (0 V) and the actual voltage producing the midscale
output code.
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.
ENOB
S
N
D
dB
=
+
]
(
)
/
–1 76
/6 02
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 signal is held for a conversion.
TRANSIENT RESPONSE
The time required for the AD7677 to achieve its rated accuracy
after a full-scale step function is applied to its input.
PIN CONFIGURATION
48-Lead LQFP
(ST-48)
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
5
6
7
8
9
10
11
12
48 47 46 45 44
39 38 37
43 42 41 40
PIN 1
TOP VIEW
(Not to Scale)
AGND
CNVST
PD
RESET
CS
RD
DGND
BUSY
D15
D14
D13
D12
AGND
AVDD
NC
BYTESWAP
OB/
2C
WARP
IMPULSE
SER/
PAR
NC = NO CONNECT
D0
D1
D2/DIVSCLK[0]
D3/DIVSCLK[1]
AD7677
N
N
N
N
N
I
N
N
N
I
–
R
R
D
I
D
D
D
O
O
D
D
D
D
D
D
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| AD7677ACPZRL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 1MSPS 16BIT PARALLEL/SERL 48LFCSP EP - Tape and Reel |
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