ITOTAL+ A3
參數(shù)資料
型號(hào): ADA4638-1ARZ-RL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 13/25頁(yè)
文件大小: 0K
描述: IC OPAMP RRO ZERO DRIFT 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 零漂移
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 1.5 V/µs
增益帶寬積: 1.5MHz
-3db帶寬: 2.5MHz
電流 - 輸入偏壓: 45pA
電壓 - 輸入偏移: 0.5µV
電流 - 電源: 850µA
電流 - 輸出 / 通道: 38mA
電壓 - 電源,單路/雙路(±): 4.5 V ~ 30 V,±2.25 V ~ 15 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(yīng)商設(shè)備封裝: 8-SO
包裝: 帶卷 (TR)
Data Sheet
ADA4638-1
Rev. 0 | Page 19 of 24
ADA4638-1
A1
ITOTAL+
A3
ISY+
RIN1
+VSY
VOUT
–VSY
IINPUT+
RIN2
IINPUT–
A4
ISY
A2
ITOTAL
100
72-
06
2
Figure 62. Comparator B
Figure 63 and Figure 64 show the total supply current of the
system, ITOTAL, and the actual currents, ISY, that flow into and
out of the supply pins of the ADA4638-1. With RIN1 = RIN2 =
100 kΩ and supply voltage of 30 V, the total supply current of
the system is 800 μA to 900 μA.
With smaller input series resistors, total supply current of the
system increases much more. Figure 65 and Figure 66 show the
supply currents with RIN1 = RIN2 = 0 Ω. The total current of the
system increases to 10 mA.
ITOTAL = ISY + IINPUT
Note that, at 30 V of supply voltage, 8 mA to 9 mA of current
flows through the input pins. This is undesirable. The ADA4638-1
is not recommended to be used as a comparator. If absolutely
necessary, place resistors in series with the inputs of the ampli-
fier to limit input current to less than 10 mA.
For more details on op amps as comparators, refer to the
AN-849 Application Note, Using Op Amps as Comparators.
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
0
5
10
15
20
25
30
CU
RRE
N
T
(
m
A
)
VSY (V)
ISY+
ITOTAL
ITOTAL+
ISY
100
72
-06
3
Figure 63. Supply Current vs. Supply Voltage
(Comparator A, RIN1 = RIN2 = 100 kΩ)
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
0
5
10
15
20
25
30
CU
RRE
N
T
(
m
A
)
VSY (V)
ISY+
ITOTAL
ITOTAL+
ISY
10
07
2-
06
4
Figure 64. Supply Current vs. Supply Voltage
(Comparator B, RIN1 = RIN2 = 100 kΩ)
–12
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
0
5
10
15
20
25
30
CUR
RE
NT
(
m
A)
VSY (V)
ISY+
ITOTAL
ITOTAL+
ISY
1007
2-
06
5
Figure 65. Supply Current vs. Supply Voltage
(Comparator A, RIN1 = RIN2 = 0 kΩ)
–12
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
0
5
10
15
20
25
30
C
URRE
N
T
(
m
A)
VSY (V)
ISY+
ITOTAL
ITOTAL+
ISY
10
07
2-
0
66
Figure 66. Supply Current vs. Supply Voltage
(Comparator B, RIN1 = RIN2 = 0 kΩ)
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