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參數資料
| 型號： | AD7898 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5 V, 12-Bit, Serial 220 kSPS ADC in an 8-Lead Package |
| 中文描述： | 5伏，12位，220 kSPS的串行ADC的8引腳封裝 |
| 文件頁數： | 7/16頁 |
| 文件大小： | 184K |
| 代理商： | AD7898 |
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7898 at 220 kSPS
sampling rate with a 30 kHz input frequency while operating in
Mode 0.
S
–15
–35
–55
–95
–115
5
–75
FREQUENCY – kHz
100
80
60
40
20
0
8192 POINT FFT
f
SAMPLE
= 220kSPS
f
SINAD = 71.823dB
THD = –90.28dB
SFDR = –91.467dB
TPC 1. Mode 0 Dynamic Performance
TPC 2 shows a typical FFT plot for the AD7898 at 220 kSPS
sampling rate with a 30 kHz input frequency while operating in
Mode 1.
S
–
–
15
–
35
–
55
–
95
–
115
5
–
75
FREQUENCY
–
kHz
100
80
60
40
20
0
8192 POINT FFT
f
SAMPLE
= 220kSPS
f
SINAD = 71.779dB
THD =
–
88.337dB
SFDR =
–
89.639dB
TPC 2. Mode 1 Dynamic Performance
TPC 3 shows the Power Supply Rejection Ratio versus supply
frequency for the AD7898. 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 V
DD
supply of frequency f
S
.
PSRR
(
dB
) = 10 log (
Pf
/
Pfs
)
Pf
= Power at frequency
f
in ADC output,
Pfs
= power at fre-
quency
fs
coupled on to the ADC V
DD
supply input. Here a
100 mV peak-to-peak sine wave is coupled onto the V
DD
supply.
100 nF decoupling was used on the supply.
INPUT FREQUENCY
–
kHz
P
–
–
40
–
50
–
70
–
80
80
60
40
20
10
0
–
20
–
30
–
60
70
50
30
TPC 3. PSRR vs. Supply Ripple Frequency
TPC 4 shows a graph of effective number of bits versus input
frequency while sampling at 220 kSPS.
INPUT FREQUENCY
–
kHz
E
11.7
11.6
11.4
11.2
100
80
40
20
0
11.9
11.8
11.5
60
11.3
TPC 4. Effective Number of Bits vs. Input Frequency at
220 kSPS
The effective number of bits for a device can be calculated from
its measured Signal to (Noise + Distortion) Ratio (see Termi-
nology section). TPC 4 shows a typical plot of effective number
of bits versus frequency for the AD7898 from dc to f
SAMPLE/2
.
The sampling frequency is 220 kSPS.
The formula for Signal to (Noise + Distortion) Ratio is related
to the resolution or number of bits in the converter. Rewriting
the formula, below, gives a measure of performance expressed in
effective number of bits (N):
N = (SNR – 1.76)/6.02
where
SNR
is Signal to (Noise + Distortion) Ratio.
–7–
REV. 0
Typical Performance Characteristics
–
AD7898
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