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參數資料
| 型號： | AD8629ARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CHOPPER R-R DUAL 8SOIC |
| 標準包裝： | 1,000 |
| 放大器類型： | 零漂移 |
| 電路數： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 1 V/µs |
| 增益帶寬積： | 2.5MHz |
| -3db帶寬： | 2.5MHz |
| 電流 - 輸入偏壓： | 30pA |
| 電壓 - 輸入偏移： | 1µV |
| 電流 - 電源： | 850µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5 V，±1.35 V ~ 2.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | AD8629ARZ-REEL7-ND AD8629ARZ-REEL7TR |
AD8628/AD8629/AD8630
Data Sheet
Rev. J | Page 16 of 24
PEAK-TO-PEAK NOISE
Because of the ping-pong action between auto-zeroing and
AD8630 is much lower than the competition. Figure 50 and
Figure 51 show this comparison.
en p-p = 0.5V
BW = 0.1Hz TO 10Hz
TIME (1s/DIV)
VO
LT
AG
E
(
0.
5
V
/DI
V
)
02735-
047
Figure 50. AD8628 Peak-to-Peak Noise
en p-p = 2.3V
BW = 0.1Hz TO 10Hz
TIME (1s/DIV)
VO
LT
AG
E
(
0.
5
V
/DI
V
)
02735-
048
Figure 51. Competitor A Peak-to-Peak Noise
NOISE BEHAVIOR WITH FIRST-ORDER, LOW-PASS
FILTER
The AD8628 was simulated as a low-pass filter (see Figure 53)
and then configured as shown in Figure 52. The behavior of the
AD8628 matches the simulated data. It was verified that noise is
rolled off by first-order filtering. Figure 53 and Figure 54 show
the difference between the simulated and actual transfer functions
of the circuit shown in Figure 52.
470pF
OUT
100k
IN
1k
02735-
049
Figure 52. First-Order Low-Pass Filter Test Circuit,
×101 Gain and 3 kHz Corner Frequency
FREQUENCY (kHz)
N
O
ISE
(d
B
)
50
45
40
35
30
25
15
10
5
20
0
30
60
100
80
70
50
40
20
10
02735-
050
Figure 53. Simulation Transfer Function of the Test Circuit in Figure 52
FREQUENCY (kHz)
N
O
ISE
(d
B
)
50
45
40
35
30
25
15
10
5
20
0
30
60
100
90
80
70
50
40
20
10
02735-
051
Figure 54. Actual Transfer Function of the Test Circuit in Figure 52
The measured noise spectrum of the test circuit charted in
Figure 54 shows that noise between 5 kHz and 45 kHz is
successfully rolled off by the first-order filter.
TOTAL INTEGRATED INPUT-REFERRED NOISE FOR
FIRST-ORDER FILTER
For a first-order filter, the total integrated noise from the
AD8628 is lower than the noise of Competitor A.
3dB FILTER BANDWIDTH (Hz)
R
MS
N
O
ISE
(
V)
10
1
0.1
10
100
10k
1k
02735-
052
COMPETITOR A
AD8551
AD8628
Figure 55. RMS Noise vs. 3 dB Filter Bandwidth in Hz
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