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參數(shù)資料
| 型號： | AD9058 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | Dual 8-Bit 50 MSPS A/D Converter |
| 中文描述： | 雙8位50 MSPS的A/D轉(zhuǎn)換 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 148K |
| 代理商： | AD9058 |
REV. B
AD9058
–7–
t
V
t
PD
N
t
A
N + 1
ANALOG INPUT
ENCODE
D
–
D
0
7
DATA
CHANGING
VALID DATA
FOR N
–
1
VALID DATA
FOR N
VALID DATA
FOR N + 1
N + 2
t
V
= DATA DELAY OF
PRECEDING ENCODE
t
PD
= OUTPUT PROPAGATION DELAY
= APERTURE TIME
t
A
Figure 4. AD9058 Timing Diagram
Figure 5 below shows what the analog input to the AD9058 would
look like when observed relative to the sample clock. Signal-
to-noise ratio (SNR), transient response, and sample rate are all
critical specifications in digitizing this “eye pattern.”
ANALOG
INPUT
SAMPLE
CLOCK
Figure 5. AD9058 I and Q Input Signals
Receiver sensitivity is limited by the SNR of the system. For the
ADC, SNR is measured in the frequency domain and calculated
with a Fast Fourier Transform (FFT). The
signal-to-noise ratio
equals the ratio of the fundamental component of the signal
(rms amplitude) to the rms level of the noise. Noise is the sum
of all other spectral components, including harmonic distortion,
but excluding dc.
Although the signal being sampled does not have a significant
slew rate at the instant it is encoded, dynamic performance of
the ADC and the system is still critical.
Transient response is
the
time required for the AD9058 to achieve full accuracy when a
step function input is applied.
Overvoltage recovery time is
the in-
terval required for the AD9058 to recover to full accuracy after
an overdriven analog input signal is reduced to its input range.
Time domain performance of the ADC is also extremely impor-
tant in digital oscilloscopes. When a track (sample)-and-hold is
used ahead of the ADC, its operation becomes similar to that
described above for receivers.
The dynamic response to high-frequency inputs can be described
by the
effective number of bits
(ENOB). The
effective number of bits
is calculated with a sine wave curve fit and is expressed as:
ENOB = N – LOG
2
[Error (measured)/Error (ideal)]
where
N
is the resolution (number of bits) and measured error
is actual rms error calculated from the converter’s outputs with
a pure sine wave applied as the input.
Maximum conversion rate
is defined as the encode (sample) rate
at which SNR of the lowest frequency analog test signal drops
no more than 3 dB below the guaranteed limit.
H
–
60
55
50
45
40
35
INPUT FREQUENCY
–
MHz
0.1
1
10
100
30
+25
°
C
–
55
°
C
+125
°
C
Figure 6. Harmonic Distortion vs. Analog Input Frequency
0.1
1
10
100
INPUT FREQUENCY
–
MHz
8.0
7.2
6.4
5.5
E
55
50
AAAAAAA
45
40
35
30
S
–
AAA
AA
AA
AA
+25
°
C AND +125
°
C
–
55
°
C
Figure 7. AD9058 Dynamic Performance vs. Analog Input
Frequency
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| AD9058AJJ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual 8-Bit 50 MSPS A/D Converter |
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