參數(shù)資料
型號: AD7691BRMZ
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN
中文描述: 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10
封裝: LEAD FREE, MO-187BA, MSOP-10
文件頁數(shù): 10/28頁
文件大?。?/td> 682K
代理商: AD7691BRMZ
AD7691
TYPICAL PERFORMANCE CHARACTERISTICS
Rev. 0 | Page 10 of 28
1.5
–1.5
0
262144
CODE
I
1.0
0.5
0
–0.5
–1.0
65536
131072
196608
POSITIVE INL = 0.39LSB
NEGATIVE INL = –0.73LSB
0
Figure 7. Integral Nonlinearity vs. Code 2.5 V
80k
0
25
CODE IN HEX
C
70k
60k
50k
40k
30k
20k
10k
26
27
28
29
2A
2B
2C
2D
2E
2F
0
0
26
2062
14
0
0
2904
69769
28527
27770
VDD = REF = 5V
σ
= 0.76LSB
0
Figure 8. Histogram of a DC Input at the Code Center, 5 V
0
–180
0
FREQUENCY (kHz)
Figure 9. 2 kHz FFT Plot, 5 V
A
–20
–40
–60
–80
–100
–120
–140
–160
20
40
60
80
100
120
32768 POINT FFT
VDD = REF = 5V
f
S
= 250kSPS
f
= 2kHz
SNR = 101.4dB
THD = –120.1dB
2ND HARMONIC = –140.7dB
3RD HARMONIC = –120.3dB
0
1.0
–1.0
0
262144
CODE
D
0.5
0
–0.5
65536
131072
196608
POSITIVE DNL = 0.37LSB
NEGATIVE DNL = –0.33LSB
0
Figure 10. Differential Nonlinearity vs. Code, 5 V
45k
0
CODE IN HEX
C
24
23
25 26
28 29
2B
2A
2C 2D
2F
2E
30
31
0
12
29501
91078
9
0
17460
28179
VDD = REF = 2.5V
σ
= 1.42LSB
14362
24411
27
2997
38068
0
40k
35k
30k
25k
20k
15k
10k
5k
4055
Figure 11. Histogram of a DC Input at the Code Center, 2.5 V
0
–180
0
FREQUENCY (kHz)
Figure 12. 2 kHz FFT Plot, 2.5 V
A
–20
–40
–60
–80
–100
–120
–140
–160
20
10
30
40
50
60
70
80
90
32768 POINT FFT
VDD = REF = 2.5V
f
S
= 180kSPS
f
= 2kHz
SNR = 96.4dB
THD = –120.3dB
2ND HARMONIC = –132.5dB
3RD HARMONIC = –121.2dB
0
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