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參數資料
| 型號： | AD7866 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual 1 MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface |
| 中文描述： | 雙1 MSPS的12位，雙通道SAR型ADC的串行接口 |
| 文件頁數： | 8/20頁 |
| 文件大?。?/td> | 304K |
| 代理商： | AD7866 |
REV. 0
AD7866
–8–
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7866 at 1 MHz sample
rate and 300 kHz input frequency. TPC 2 shows the signal-to-
(noise + distortion) ratio performance versus input frequency for
various supply voltages while sampling at 1 MSPS with an SCLK
of 20 MHz.
TPC 3a through TPC 4b show the power supply rejection ratio
versus AV
DD
supply ripple frequency for the AD7866 under differ-
ent conditions. The power supply rejection ratio is defined as the
ratio of the power in the ADC output at full-scale frequency f,
to the power of a 100 mV sine wave applied to the ADC AV
DD
supply of frequency f
S
:
PSRR (dB) =
10
log (Pf/Pf
S
)
Typical Performance Characteristics
FREQUENCY – kHz
0
–35
–115
0
500
100
S
200
300
400
–55
–75
–95
50
150
250
350
450
4098 POINT FFT
f
SAMPLE
= 1MSPS
f
= 300kHz
SNR = 70.31dB
THD = –85.47dB
SFDR = –86.64dB
–15
TPC 1. Dynamic Performance
INPUT FREQUENCY
–
Hz
–
61
–
7510k
1000k
100k
S
–
–
73
–
63
–
67
–
69
–
71
–
65
T
A
= 25 C
V
DD
= V
DRIVE
= 2.7V
V
DD
= V
DRIVE
= 3.6V
V
DD
= V
DRIVE
= 5.25V
V
DD
= V
DRIVE
= 4.75V
TPC 2. SINAD vs. Input Frequency
Pf
= Power at frequency f in ADC output,
Pf
S
= power at fre-
quency f
S
coupled onto the ADC AV
DD
supply. Here a 100 mV
peak-to-peak sine wave is coupled onto the AV
DD
supply while
the digital supply is left unaltered. TPCs 3a and 3b show the
PSRR of the AD7866 when there is no decoupling on the supply,
while TPCs 4a and 4b show the PSRR with decoupling capacitors
of 10
μ
F and 0.1
μ
F on the supply.
TPC 5 and TPC 6 show typical DNL and INL plots for the AD7866.
TPC 7 shows a graph of the total harmonic distortion versus analog
input frequency for various source impedances.
TPC 8 shows a graph of total harmonic distortion versus analog
input frequency for various supply voltages. See Analog Input
section.
AV
DD
RIPPLE FREQUENCY
–
Hz
0
–
100
1k
P
–
10k
–
90
–
80
–
70
–
60
–
50
–
40
–
30
–
20
–
10
100k
1M
100mV p-p SINEWAVE ON AV
DD
2.5V EXT REFERENCE ON V
REF
T
A
= 25 C
V
DD
= 2.7V
V
DD
= 5.25V
V
DD
= 4.75V
V
DD
= 3.6V
TPC 3a. PSRR vs. Supply Ripple Frequency,
without Supply Decoupling
AV
DD
RIPPLE FREQUENCY
–
Hz
0
–
100
1k
P
–
10k
–
90
–
80
–
70
–
60
–
50
–
40
–
30
–
20
–
10
100k
1M
100mV p-p SINEWAVE ON AV
DD
2.5V EXT REFERENCE ON D
CAP
A, D
CAP
B
T
A
= 25 C
V
DD
= 2.7V
V
DD
= 5.25V
V
DD
= 4.75V
V
DD
= 3.6V
TPC 3b. PSRR vs. Supply Ripple Frequency,
without Supply Decoupling
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