NE5534AD [TI]
LOW OPERATIONAL AMPLIFIERS; LOW运算放大器型号: | NE5534AD |
厂家: | TEXAS INSTRUMENTS |
描述: | LOW OPERATIONAL AMPLIFIERS |
文件: | 总12页 (文件大小:287K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ꢀꢁꢂ ꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ
ꢇ
ꢈ
ꢉ
ꢊ
ꢀ
ꢈ
ꢋ
ꢌ
ꢁ
ꢈ
ꢍ
ꢁ
ꢎ
ꢆ
ꢏ
ꢋ
ꢈ
ꢀ
ꢆ
ꢆ
ꢐ
ꢍ
ꢇ
ꢋ
ꢑ
ꢋ
ꢁ
ꢎ
ꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
NE5534 . . . D, P, OR PS PACKAGE
NE5534A . . . D OR P PACKAGE
(TOP VIEW)
D
Equivalent Input Noise Voltage . . .
3.5 nV//Hz
D
Unity-Gain Bandwidth . . . 10 MHz Typ
COMP/BAL
BALANCE
IN−
1
2
3
4
8
7
6
5
D
Common-Mode Rejection Ratio . . .
100 dB Typ
V
CC+
OUT
IN+
D
D
High DC Voltage Gain . . . 100 V/mV Typ
Peak-to-Peak Output Voltage Swing
COMP
V
CC−
32 V Typ With V
= +18 V and R = 600 W
CC
L
+
D
D
D
D
D
High Slew Rate . . . 13 V/ms Typ
Wide Supply-Voltage Range +3 V to +20 V
Low Harmonic Distortion
Offset Nulling Capability
External Compensation Capability
description/ordering information
The NE5534 and NE5534A are high-performance operational amplifiers combining excellent dc and ac
characteristics. Some of the features include very low noise, high output-drive capability, high unity-gain and
maximum-output-swing bandwidths, low distortion, and high slew rate.
These operational amplifiers are compensated internally for a gain equal to or greater than three. Optimization
of the frequency response for various applications can be obtained by use of an external compensation
capacitor between COMP and COMP/BAL. The devices feature input-protection diodes, output short-circuit
protection, and offset-voltage nulling capability with use of the BALANCE and COMP/BAL pins (see the
application circuit diagram).
For the NE5534A, a maximum limit is specified for the equivalent input noise voltage.
ORDERING INFORMATION
V
max
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
IO
†
PACKAGE
T
A
AT 25°C
Tube of 50
Tube of 50
Tube of 75
Reel of 2500
Tube of 75
Reel of 2500
Reel of 2000
NE5534P
NE5534P
PDIP (P)
NE5534AP
NE5534D
NE5534AP
NE5534
0°C to 70°C
4 mV
NE5534DR
NE5534AD
NE5534ADR
NE5534PS
SOIC (D)
SOP (PS)
5534A
N5534
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available
at www.ti.com/sc/package.
ꢍ
ꢍ
ꢎ
ꢈ
ꢤ
ꢒ
ꢟ
ꢓ
ꢔ
ꢝ
ꢏ
ꢞ
ꢋ
ꢘ
ꢈ
ꢖ
ꢀ
ꢗ
ꢒ
ꢆ
ꢏ
ꢆ
ꢕ
ꢖ
ꢠ
ꢗ
ꢘ
ꢞ
ꢙ
ꢚ
ꢛ
ꢛ
ꢜ
ꢜ
ꢕ
ꢕ
ꢘ
ꢘ
ꢖ
ꢖ
ꢕ
ꢝ
ꢝ
ꢡ
ꢞ
ꢟ
ꢙ
ꢙ
ꢠ
ꢠ
ꢖ
ꢜ
ꢛ
ꢚ
ꢝ
ꢝ
ꢘ
ꢗ
ꢡ
ꢏꢠ
ꢟ
ꢢ
ꢝ
ꢣ
ꢕ
ꢞ
ꢛ
ꢝ
ꢜ
ꢕ
ꢜ
ꢘ
ꢙ
ꢖ
ꢟ
ꢤ
ꢛ
ꢖ
ꢜ
ꢜ
ꢠ
ꢝ
ꢥ
Copyright 2004, Texas Instruments Incorporated
ꢙ
ꢘ
ꢞ
ꢜ
ꢘ
ꢙ
ꢚ
ꢜ
ꢘ
ꢝ
ꢡ
ꢕ
ꢗ
ꢕ
ꢞ
ꢠ
ꢙ
ꢜ
ꢦ
ꢜ
ꢠ
ꢙ
ꢘ
ꢗ
ꢧ
ꢛ
ꢋ
ꢖ
ꢚ
ꢠ
ꢝ
ꢜ
ꢛ
ꢖ
ꢤ
ꢛ
ꢙ
ꢤ
ꢨ
ꢛ
ꢜ ꢠ ꢝ ꢜꢕ ꢖꢪ ꢘꢗ ꢛ ꢣꢣ ꢡꢛ ꢙ ꢛ ꢚ ꢠ ꢜ ꢠ ꢙ ꢝ ꢥ
ꢙ
ꢙ
ꢛ
ꢖ
ꢜ
ꢩ
ꢥ
ꢍ
ꢙ
ꢘ
ꢤ
ꢟ
ꢞ
ꢜ
ꢕ
ꢘ
ꢖ
ꢡ
ꢙ
ꢘ
ꢞ
ꢠ
ꢝ
ꢝ
ꢕ
ꢖ
ꢪ
ꢤ
ꢘ
ꢠ
ꢝ
ꢖ
ꢘ
ꢜ
ꢖ
ꢠ
ꢞ
ꢠ
ꢝ
ꢝ
ꢛ
ꢙ
ꢕ
ꢣ
ꢩ
ꢕ
ꢖ
ꢞ
ꢣ
ꢟ
ꢤ
ꢠ
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀ ꢁꢂ ꢂꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀ ꢈꢋ ꢌꢁ ꢈꢍꢁ ꢎꢆꢏꢋ ꢈ ꢀꢆ ꢇ ꢆꢐ ꢍꢇ ꢋ ꢑꢋ ꢁ ꢎꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
schematic
BALANCE
1
COMP/BAL
COMP
5
8
7
V
CC+
100 pF
12 kΩ
12 kΩ
IN+
IN−
3
40 pF
12 pF
15 Ω
6
OUT
2
7 pF
15 Ω
4
V
CC−
All component values shown are nominal.
symbol
application circuit
V
CC+
22 kΩ
COMP
100 kΩ
COMP/BAL
C
C
1
−
+
IN−
IN+
8
2
3
OUT
−
+
5
7
6
5534
BALANCE
4
V
CC−
Frequency Compensation and Offset-Voltage Nulling Circuit
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀꢁꢂ ꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀꢈ ꢋꢌ ꢁ ꢈ ꢍꢁꢎ ꢆꢏ ꢋꢈ ꢀꢆꢇ ꢆꢐ ꢍ ꢇꢋ ꢑꢋ ꢁꢎ ꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage: V
V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −22 V
CC+
CC−
Input voltage either input (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
CC+
Input current (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Duration of output short circuit (see Note 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited
Package thermal impedance, θ (see Notes 5 and 6): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
JA
P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85°C/W
PS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 95°C/W
Operating virtual junction temperature, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
J
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
stg
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values, except differential voltages, are with respect to the midpoint between V
and V .
CC+
CC−
2. The magnitude of the input voltage must never exceed the magnitude of the supply voltage.
3. Excessive current will flow if a differential input voltage in excess of approximately 0.6 V is applied between the inputs, unless some
limiting resistance is used.
4. The output may be shorted to ground or to either power supply. Temperature and/or supply voltages must be limited to ensure the
maximum dissipation rating is not exceeded.
5. Maximum power dissipation is a function of T (max), θ , and T . The maximum allowable power dissipation at any allowable
J
JA
A
ambient temperature is P = (T (max) − T )/θ . Operating at the absolute maximum T of 150°C can affect reliability.
D
J
A
JA
J
6. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions
MIN
5
MAX
15
UNIT
V
V
V
Supply voltage
Supply voltage
CC+
−5
−15
V
CC−
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀ ꢁꢂ ꢂꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀ ꢈꢋ ꢌꢁ ꢈꢍꢁ ꢎꢆꢏꢋ ꢈ ꢀꢆ ꢇ ꢆꢐ ꢍꢇ ꢋ ꢑꢋ ꢁ ꢎꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
electrical characteristics, V
= 15 V, T = 25°C (unless otherwise noted)
A
CC
†
PARAMETER
MIN
TYP
MAX
4
UNIT
TEST CONDITIONS
T = 25°C
A
0.5
V
R
= 0,
= 50 Ω
O
S
V
IO
Input offset voltage
Input offset current
Input bias current
mV
T
A
= Full range
= 25°C
5
T
A
20
300
400
1500
2000
I
IO
V
O
= 0
= 0
nA
T
A
= Full range
= 25°C
T
A
500
I
IB
V
nA
V
O
T
A
= Full range
V
ICR
Common-mode input voltage range
12
24
30
25
15
13
26
V
V
=
=
15 V
18 V
CC
V
Maximum peak-to-peak output voltage swing
R
≥ 600 Ω
V
O(PP)
L
32
CC
T
A
= 25°C
= Full range
= 0
100
V
R
=
10 V,
O
A
VD
Large-signal differential voltage amplification
Small-signal differential voltage amplification
V/mV
V/mV
≥ 600 Ω
T
A
L
C
C
C
C
6
2.2
200
95
C
C
C
C
O
A
vd
f = 10 kHz
= 22 pF
= 0
V
V
=
10 V
18 V,
O
= 22 pF
B
B
Maximum-output-swing bandwidth
kHz
OM
=
V
C
= 14 V,
= 22 pF
CC
70
R
≥ 600 Ω,
L
C
Unity-gain bandwidth
Input resistance
C
= 22 pF,
C
= 100 pF
10
MHz
1
C
L
r
30
100
kΩ
i
A
C
= 30 dB,
= 22 pF,
R
≥ 600 Ω,
VD
C
L
z
Output impedance
0.3
100
100
Ω
o
f = 10 kHz
,
= V min
ICR
V
R
= 0,
= 50 Ω
V
IC
O
CMRR Common-mode rejection ratio
70
80
dB
dB
S
V
V
=
9 V to 15 V,
R
= 50 Ω,
CC+
O
S
k
Supply-voltage rejection ratio (∆V /∆V
IO)
SVR
CC
= 0
I
I
Output short-circuit current
Supply current
38
4
mA
mA
OS
V
O
= 0, No load
T
A
= 25°C
8
CC
†
All characteristics are measured under open-loop conditions with zero common-mode input voltage, unless otherwise specified. Full range is
= 0°C to 70°C.
T
A
operating characteristics, V
= 15 V, T = 25°C
A
CC
NE5534
TYP
13
NE5534A
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
13
6
MAX
C
C
= 0
C
C
SR
Slew rate
V/µs
= 22 pF
6
A
C
= 1,
= 22 pF
V = 50 mV,
Rise time
VD
C
20
20
50
35
20
20
50
35
ns
%
ns
%
I
R
C
= 600 Ω,
= 100 pF
L
L
Overshoot factor
Rise time
t
r
A
= 1,
= 47 pF
V = 50 mV,
VD
I
L
L
C
R
C
= 600 Ω,
= 500 pF
C
Overshoot factor
f = 30 Hz
f = 1 kHz
f = 30 Hz
f = 1 kHz
7
4
5.5
3.5
1.5
0.4
0.9
7
V
Equivalent input noise voltage
nV/√Hz
n
4.5
2.5
0.6
I
n
Equivalent input noise current
Average noise figure
pA/√Hz
R
= 5 kΩ,
f = 10 Hz to 20 kHz
dB
F
S
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀꢁꢂ ꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀꢈ ꢋꢌ ꢁ ꢈ ꢍꢁꢎ ꢆꢏ ꢋꢈ ꢀꢆꢇ ꢆꢐ ꢍ ꢇꢋ ꢑꢋ ꢁꢎ ꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
†
TYPICAL CHARACTERISTICS
NORMALIZED INPUT BIAS CURRENT
AND INPUT OFFSET CURRENT
vs
MAXIMUM PEAK-TO-PEAK OUTPUT VOLTAGE
vs
FREQUENCY
FREE-AIR TEMPERATURE
30
25
20
15
10
5
1.6
1.4
1.2
1
V
=
15 V
C
= 0
CC
C
Offset
Bias
0.8
0.6
0.4
C
= 22 pF
C
C
= 47 pF
V
T
A
=
15 V
C
CC
= 25°C
0
100
−75 −50 −25
0
25
50
75
100 125
1 k
10 k
100 k
1 M
T
A
− Free-Air Temperature − °C
f − Frequency − Hz
Figure 1
Figure 2
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
NORMALIZED SLEW RATE AND
UNITY-GAIN BANDWIDTH
vs
vs
FREQUENCY
SUPPLY VOLTAGE
6
10
5
10
4
10
3
10
2
10
1.2
1.1
1
V
T
A
= 15 V
= 25°C
CC
T
A
= 25°C
Unity-Gain
Bandwidth
0.9
0.8
0.7
C
= 0 pF
C
Slew Rate
0.6
0.5
C
= 22 pF
C
10
1
10
0.4
100
1 k
10 k 100 k 1 M 10 M 100 M
0
5
10
15
20
f − Frequency − Hz
| V
CC
| − Supply Voltage − V
Figure 3
Figure 4
†
Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀ ꢁꢂ ꢂꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀ ꢈꢋ ꢌꢁ ꢈꢍꢁ ꢎꢆꢏꢋ ꢈ ꢀꢆ ꢇ ꢆꢐ ꢍꢇ ꢋ ꢑꢋ ꢁ ꢎꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
†
TYPICAL CHARACTERISTICS
NORMALIZED SLEW RATE AND
UNITY-GAIN BANDWIDTH
vs
TOTAL HARMONIC DISTORTION
vs
FREE-AIR TEMPERATURE
FREQUENCY
0.01
1.2
1.1
V
=
15 V
CC
V
CC
=
15 V
A
VD
= 1
0.007
V
= 2 V
I(rms)
T
A
= 25°C
Slew Rate
Unity-Gain
Bandwidth
0.004
1
0.002
0.001
0.9
0.8
100
400
1 k
4 k 10 k
40 k 100 k
−75 −50 −25
0
25
50
75 100 125
f − Frequency − Hz
T
A
− Free-Air Temperature − °C
Figure 5
Figure 6
EQUIVALENT INPUT NOISE VOLTAGE
EQUIVALENT INPUT NOISE CURRENT
vs
vs
FREQUENCY
FREQUENCY
10
7
10
7
V
T
A
=
15 V
CC
V
T
A
=
15 V
CC
= 25°C
= 25°C
4
2
SE5534, NE5534
4
SE5534A, NE5534A
1
SE5534, NE5534
0.7
2
1
0.4
SE5534A, NE5534A
0.2
0.1
10
100
1 k
10 k
100 k
10
100
1 k
10 k
100 k
f − Frequency − Hz
f − Frequency − Hz
Figure 7
Figure 8
†
Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ꢀꢁꢂ ꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢂꢃ ꢄꢆ
ꢇ ꢈꢉꢊꢀꢈ ꢋꢌ ꢁ ꢈ ꢍꢁꢎ ꢆꢏ ꢋꢈ ꢀꢆꢇ ꢆꢐ ꢍ ꢇꢋ ꢑꢋ ꢁꢎ ꢌ
SLOS070B − JULY 1979 − REVISED FEBRUARY 2004
TYPICAL CHARACTERISTICS
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
100
V
T
A
=
15 V
CC
70
40
= 25°C
20
10
7
4
f = 10 Hz to 20 kHz
2
1
0.7
0.4
f = 200 Hz to 4 kHz
0.2
0.1
100
1 k
10 k
100 k
1 M
R
− Source Resistance − Ω
S
Figure 9
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
MCER001A – JANUARY 1995 – REVISED JANUARY 1997
JG (R-GDIP-T8)
CERAMIC DUAL-IN-LINE
0.400 (10,16)
0.355 (9,00)
8
5
0.280 (7,11)
0.245 (6,22)
1
4
0.065 (1,65)
0.045 (1,14)
0.310 (7,87)
0.290 (7,37)
0.063 (1,60)
0.015 (0,38)
0.020 (0,51) MIN
0.200 (5,08) MAX
0.130 (3,30) MIN
Seating Plane
0.023 (0,58)
0.015 (0,38)
0°–15°
0.100 (2,54)
0.014 (0,36)
0.008 (0,20)
4040107/C 08/96
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
MPDI001A – JANUARY 1995 – REVISED JUNE 1999
P (R-PDIP-T8)
PLASTIC DUAL-IN-LINE
0.400 (10,60)
0.355 (9,02)
8
5
0.260 (6,60)
0.240 (6,10)
1
4
0.070 (1,78) MAX
0.325 (8,26)
0.300 (7,62)
0.020 (0,51) MIN
0.015 (0,38)
Gage Plane
0.200 (5,08) MAX
Seating Plane
0.010 (0,25) NOM
0.125 (3,18) MIN
0.100 (2,54)
0.021 (0,53)
0.430 (10,92)
MAX
0.010 (0,25)
M
0.015 (0,38)
4040082/D 05/98
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Audio
Amplifiers
amplifier.ti.com
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
Digital Control
Military
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
Logic
interface.ti.com
logic.ti.com
Power Mgmt
Microcontrollers
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
Telephony
Video & Imaging
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
相关型号:
©2020 ICPDF网 联系我们和版权申明