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參數資料
型號: AD7725BS
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 16-Bit 900 kSPS ADC with a Programmable Postprocessor
中文描述: 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL/PARALLEL ACCESS, PQFP44
封裝: PLASTIC, MS-022-AB, MQFP-44
文件頁數: 14/28頁
文件大小: 442K
代理商: AD7725BS
REV. A
–14–
AD7725–Typical Performance Characteristics
PERFORMANCE PLOTS
The following typical plots are generated using the digital filter shown in Figure 1.
(AV
DD
= DV
DD
, T
A
= 25 C, CLKIN = 9.6 MHz, External Reference = 2.5 V, unless otherwise noted.)
ANALOG INPUT LEVEL – dB
110
100
30–50
0
d
–40
–30
–20
90
60
50
80
70
40
–10
SFDR
THD
SNR
INPUT FREQUENCY = 10kHz
TPC 1. SNR, THD, and SFDR vs. Analog Input
Level Relative to Full Scale
CLKIN FREQUENCY – MHz
120
60
0
14.4
d
2.4
7.2
9.6
110
80
70
12
100
4.8
90
THD
SFDR
SNR
INPUT FREQUENCY = 10kHz
TPC 2. SNR, THD, and SFDR vs. Sampling Frequency
TEMPERATURE – C
110
105
70–50
100
d
–25
0
25
100
85
80
95
90
75
75
SFDR
THD
SNR
INPUT FREQUENCY = 10kHz
50
TPC 3. SNR, THD, and SFDR vs. Temperature
CODE
5000
0
32726
F
32718
32721 32722
4000
2000
1000
32724
8192 SAMPLES TAKEN
V
(+) = V
(–)
MAXIMUM OUTPUT DATA RATE
3000
32719 32720
32723
32725
TPC 4. Histogram of Output Codes for a DC Input
FREQUENCY – kHz
0
–20
–1600
300
P
50
100
150
–40
–100
–120
–60
–80
–140
250
SNR = 84dB
THD = –93.85dB
SFDR = –98.47dB
AIN = 10kHz
MEASURED BW = 300kHz
200
TPC 5. 16k Point FFT
FREQUENCY – kHz
0
–20
–1600
300
P
50
100
150
–40
–100
–120
–60
–80
–140
250
SNR = 80.48dB
THD = –90.62dB
SFDR = –98dB
AIN = 10kHz
MEASURED BW = 450kHz
200
350
400
450
TPC 6. 16k Point FFT for a 108 Tap Low-Pass FIR
Filter Operating with a CLKIN Frequency of 14.4 MHz
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