OPA2604 [BB]
Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER; 双路FET输入，低失真运算放大器
| 型号： | OPA2604 |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER |
| 文件： | 总14页 (文件大小：165K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
OPA2604
OPA2604
OPA2604
www.burr-brown.com/databook/OPA2604.html
Dual FET-Input, Low Distortion
OPERATIONAL AMPLIFIER
FEATURES
APPLICATIONS
● LOW DISTORTION: 0.0003% at 1kHz
● PROFESSIONAL AUDIO EQUIPMENT
● PCM DAC I/V CONVERTER
● SPECTRAL ANALYSIS EQUIPMENT
● ACTIVE FILTERS
● LOW NOISE: 10nV/√Hz
● HIGH SLEW RATE: 25V/µs
● WIDE GAIN-BANDWIDTH: 20MHz
● UNITY-GAIN STABLE
● TRANSDUCER AMPLIFIER
● DATA ACQUISITION
● WIDE SUPPLY RANGE: VS = ±4.5 to ±24V
● DRIVES 600Ω LOADS
(8)
V+
DESCRIPTION
The OPA2604 is a dual, FET-input operational ampli-
fier designed for enhanced AC performance. Very low
distortion, low noise and wide bandwidth provide
superior performance in high quality audio and other
applications requiring excellent dynamic performance.
(+)
(3, 5)
(–)
New circuit techniques and special laser trimming of
dynamic circuit performance yield very low harmonic
distortion. The result is an op amp with exceptional
sound quality. The low-noise FET input of the
OPA2604 provides wide dynamic range, even with high
source impedance. Offset voltage is laser-trimmed to
minimize the need for interstage coupling capacitors.
Distortion
Rejection
Circuitry*
(1, 7)
VO
Output
Stage*
(2, 6)
The OPA2604 is available in 8-pin plastic mini-DIP
and SO-8 surface-mount packages, specified for the
–25°C to +85°C temperature range.
(4)
V–
* Patents Granted:
#5053718, 5019789
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734
•
Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706
•
•
Tel: (520) 746-1111 • Twx: 910-952-1111
Immediate Product Info: (800) 548-6132
Internet: http://www.burr-brown.com/
•
FAXLine: (800) 548-6133 (US/Canada Only)
•
Cable: BBRCORP
•
Telex: 066-6491
•
FAX: (520) 889-1510
PDS-1069E
© 1991 Burr-Brown Corporation
Printed in U.S.A. October, 1997
SBOS006
SPECIFICATIONS
ELECTRICAL
At TA = +25°C, VS = ±15V, unless otherwise noted.
OPA2604AP, AU
TYP
PARAMETER
CONDITION
MIN
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
Average Drift
±1
±8
80
±5
mV
µV/°C
dB
Power Supply Rejection
VS = ±5 to ±24V
70
INPUT BIAS CURRENT(1)
Input Bias Current
Input Offset Current
VCM = 0V
VCM = 0V
100
±4
pA
pA
NOISE
Input Voltage Noise
Noise Density: f = 10Hz
f = 100Hz
25
15
11
10
1.5
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
µVp-p
f = 1kHz
f = 10kHz
Voltage Noise, BW = 20Hz to 20kHz
Input Bias Current Noise
Current Noise Density, f = 0.1Hz to 20kHz
6
fA/√Hz
INPUT VOLTAGE RANGE
Common-Mode Input Range
Common-Mode Rejection
±12
80
±13
100
V
dB
VCM = ±12V
INPUT IMPEDANCE
Differential
Common-Mode
1012 || 8
1012 || 10
Ω || pF
Ω || pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain
VO = ±10V, RL = 1kΩ
80
15
100
dB
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time: 0.01%
0.1%
G = 100
20Vp-p, RL = 1kΩ
G = –1, 10V Step
20
25
1.5
MHz
V/µs
µs
1
µs
Total Harmonic Distortion + Noise (THD+N)
G = 1, f = 1kHz
VO = 3.5Vrms, RL = 1kΩ
f = 1kHz, RL = 1kΩ
0.0003
%
Channel Separation
142
dB
OUTPUT
Voltage Output
Current Output
Short Circuit Current
Output Resistance, Open-Loop
RL = 600Ω
VO = ±12V
±11
±12
±35
±40
25
V
mA
mA
Ω
POWER SUPPLY
Specified Operating Voltage
Operating Voltage Range
Current, Total Both Amplifiers
±15
V
V
mA
±4.5
±24
±12
IO = 0
±10.5
TEMPERATURE RANGE
Specification
Storage
Thermal Resistance(2), θJA
–25
–40
+85
+125
°C
°C
°C/W
90
NOTES: (1) Typical performance, measured fully warmed-up. (2) Soldered to circuit board—see text.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
OPA2604
2
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Power Supply Voltage ....................................................................... ±25V
Input Voltage ............................................................. (V–)–1V to (V+)+1V
Output Short Circuit to Ground ............................................... Continuous
Operating Temperature ................................................. –40°C to +100°C
Storage Temperature..................................................... –40°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) AP ......................................... +300°C
Lead Temperature (soldering, 3s) AU .......................................... +260°C
Top View
DIP/SOIC
Output A
–In A
+In A
V–
1
2
3
4
8
7
6
5
V+
Output B
–In B
+In B
NOTE: (1) Stresses above these ratings may cause permanent damage.
ORDERING INFORMATION
PRODUCT
PACKAGE
TEMP. RANGE
OPA2604AP
OPA2604AU
8-Pin Plastic DIP
SO-8 Surface-Mount
–25°C to +85°C
–25°C to +85°C
ELECTROSTATIC
DISCHARGE SENSITIVITY
PACKAGING INFORMATION
Any integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
PACKAGE DRAWING
NUMBER(1)
PRODUCT
PACKAGE
OPA2604AP
OPA2604AU
8-Pin Plastic DIP
SO-8 Surface-Mount
006
182
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet published speci-
fications.
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
®
3
OPA2604
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, unless otherwise noted.
TOTAL HARMONIC DISTORTION + NOISE
vs OUTPUT VOLTAGE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.1
0.01
1
Measurement BW = 80kHz
See “Distortion Measure-
ments” for description of
test method.
See “Distortion Measurements”
for description of test method.
VO
3.5Vrms
1kΩ
=
VO
1kΩ
0.1
0.01
f = 1kHz
G = 100V/V
G = 10V/V
Measurement BW = 80kHz
0.001
0.001
0.0001
G = 1V/V
0.0001
0.1
1
10
100
20
100
1k
Frequency (Hz)
10k 20k
Output Voltage (Vp-p)
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
OPEN-LOOP GAIN/PHASE vs FREQUENCY
0
1k
100
10
1k
100
10
1
120
100
80
–45
–90
–135
–180
φ
Voltage Noise
60
40
G
20
0
Current Noise
1
–20
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
INPUT BIAS AND INPUT OFFSET CURRENT
vs INPUT COMMON-MODE VOLTAGE
INPUT BIAS AND INPUT OFFSET CURRENT
vs TEMPERATURE
10nA
1nA
100
10
1nA
100
10
100nA
10nA
1nA
100
10
10nA
1nA
100
10
Input
Bias Current
Input
Bias Current
Input
Offset Current
1
Input
Offset Current
1
15
1
0.1
–15
–10
–5
0
5
10
–75
–50
–25
0
25
50
75
100
125
Common-Mode Voltage (V)
Ambient Temperature (°C)
®
OPA2604
4
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
COMMON-MODE REJECTION
vs COMMON-MODE VOLTAGE
INPUT BIAS CURRENT
vs TIME FROM POWER TURN-ON
120
110
100
90
1nA
100
10
VS = ±24VDC
VS = ±15VDC
VS = ±5VDC
80
1
–15
–10
–5
0
5
10
15
0
1
2
3
4
5
Common-Mode Voltage (V)
Time After Power Turn-On (min)
POWER SUPPLY AND COMMON-MODE
REJECTION vs FREQUENCY
AOL, PSR, AND CMR vs SUPPLY VOLTAGE
120
100
80
60
40
20
0
120
110
100
90
CMR
CMR
AOL
–PSR
+PSR
80
PSR
70
10
100
1k
10k
100k
1M
10M
5
10
15
20
25
Frequency (Hz)
Supply Voltage (±VS)
GAIN-BANDWIDTH AND SLEW RATE
vs SUPPLY VOLTAGE
GAIN-BANDWIDTH AND SLEW RATE
vs TEMPERATURE
28
24
20
16
12
33
28
24
20
16
12
30
Slew Rate
29
25
21
17
25
20
15
10
Gain-Bandwidth
G = +100
Slew Rate
Gain-Bandwidth
G = +100
5
10
15
Supply Voltage (±VS)
20
25
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
®
5
OPA2604
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
SETTLING TIME vs CLOSED-LOOP GAIN
CHANNEL SEPARATION vs FREQUENCY
5
4
3
2
1
0
160
140
120
100
80
VO = 10V Step
RL = 1kΩ
CL = 50pF
RL = ∞
RL = 1kΩ
0.01%
0.1%
VO
20Vp-p
RL
=
A
B
Measured
Output
–1
–10
–100
–1000
10
–75
0
100
1k
Frequency (Hz)
10k
100k
Closed-Loop Gain (V/V)
MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY
VS = ±15V
SUPPLY CURRENT vs TEMPERATURE
Total for Both Op Amps
30
20
10
0
14
12
10
8
VS = ±15VDC
VS = ±24VDC
VS = ±5VDC
6
10k
100k
Frequency (Hz)
1M
10M
–50
–25
0
25
50
75
100
125
Ambient Temperature (°C)
LARGE-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
+100
–100
+10
–10
30
25
20
15
10
1µs
2µs
0
5
10
Time (µs)
Time (µs)
25
®
OPA2604
6
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
POWER DISSIPATION vs SUPPLY VOLTAGE
SHORT-CIRCUIT CURRENT vs TEMPERATURE
60
50
40
30
20
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Worst case sine
wave RL = 600Ω
(both channels)
ISC+ and ISC–
Typical high-level
music RL = 600Ω
(both channels)
No signal
or no load
–75
–50
–25
0
25
50
75
100
125
6
8
10
12
14
16
18
20
22
24
Ambient Temperature (°C)
Supply Voltage, ±VS (V)
MAXIMUM POWER DISSIPATION vs TEMPERATURE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
θJ-A = 90°C/W
Soldered to
Circuit Board
(see text)
Maximum
Specified Operating
Temperature
85°C
0
0
25
50
75
100
125
150
Ambient Temperature (°C)
®
7
OPA2604
APPLICATIONS INFORMATION
The OPA2604 is unity-gain stable, making it easy to use in a
wide range of circuitry. Applications with noisy or high
impedance power supply lines may require decoupling ca-
pacitors close to the device pins. In most cases 1µF tantalum
capacitors are adequate.
and capacitive load will decrease the phase margin and may
lead to gain peaking or oscillations. Load capacitance reacts
with the op amp’s open-loop output resistance to form an
additional pole in the feedback loop. Figure 2 shows various
circuits which preserve phase margin with capacitive load.
Request Application Bulletin AB-028 for details of analysis
techniques and applications circuits.
DISTORTION MEASUREMENTS
For the unity-gain buffer, Figure 2a, stability is preserved by
adding a phase-lead network, RC and CC. Voltage drop across
RC will reduce output voltage swing with heavy loads. An
alternate circuit, Figure 2b, does not limit the output with low
load impedance. It provides a small amount of positive feed-
backtoreducethenetfeedbackfactor.Inputimpedanceofthis
circuit falls at high frequency as op amp gain rolloff reduces
the bootstrap action on the compensation network.
The distortion produced by the OPA2604 is below the mea-
surement limit of virtually all commercially available equip-
ment. Aspecialtestcircuit, however, canbeusedtoextendthe
measurement capabilities.
Op amp distortion can be considered an internal error source
which can be referred to the input. Figure 1 shows a circuit
which causes the op amp distortion to be 101 times greater
than normally produced by the op amp. The addition of R3 to
the otherwise standard non-inverting amplifier configuration
alters the feedback factor or noise gain of the circuit. The
closed-loop gain is unchanged, but the feedback available for
error correction is reduced by a factor of 101. This extends the
measurement limit, including the effects of the signal-source
purity, by a factor of 101. Note that the input signal and load
applied to the op amp are the same as with conventional
feedback without R3.
Figures 2c and 2d show compensation techniques for
noninverting amplifiers. Like the follower circuits, the circuit
in Figure 2d eliminates voltage drop due to load current, but
at the penalty of somewhat reduced input impedance at high
frequency.
Figures 2e and 2f show input lead compensation networks for
inverting and difference amplifier configurations.
NOISE PERFORMANCE
Validity of this technique can be verified by duplicating
measurements at high gain and/or high frequency where the
distortion is within the measurement capability of the test
equipment. Measurements for this data sheet were made with
the Audio Precision System One which greatly simplifies
such repetitive measurements. The measurement technique
can, however, be performed with manual distortion measure-
ment instruments.
Op amp noise is described by two parameters—noise voltage
and noise current. The voltage noise determines the noise
performance with low source impedance. Low noise bipolar-
input op amps such as the OPA27 and OPA37 provide very
low voltage noise. But if source impedance is greater than a
fewthousandohms,thecurrentnoiseofbipolar-inputopamps
react with the source impedance and will dominate. At a few
thousand ohms source impedance and above, the OPA2604
will generally provide lower noise.
CAPACITIVE LOADS
The dynamic characteristics of the OPA2604 have been
optimized for commonly encountered gains, loads and oper-
ating conditions. The combination of low closed-loop gain
R1
R2
SIG. DIST.
R1
R2
R3
GAIN GAIN
1
1
101
∞
5kΩ
50Ω
2
R3
VO = 10Vp-p
(3.5Vrms)
OPA2604
10
101 500Ω 5kΩ 500Ω
100
101
50Ω
5kΩ
∞
Generator
Output
Analyzer
Input
RL
1kΩ
Audio Precision
System One
Analyzer*
IBM PC
or
Compatible
* Measurement BW = 80kHz
FIGURE 1. Distortion Test Circuit.
®
OPA2604
8
(a)
(b)
CC
1
820pF
RC
2
eo
OPA2604
1
2
eo
OPA2604
ei
750Ω
CL
5000pF
CC
0.47µF
CL
5000pF
R2
RC
120 X 10–12 CL
ei
CC
=
2kΩ
10Ω
R2
RC
CC
=
=
4CL X 1010 – 1
CL X 103
RC
(c)
(d)
R1
R2
R1
2kΩ
R2
2kΩ
10kΩ
10kΩ
CC
RC
20Ω
24pF
CC
0.22µF
RC
1
1
2
2
eo
eo
OPA2604
OPA2604
ei
25Ω
ei
CL
5000pF
CL
5000pF
R2
50
RC
CC
=
=
CC
=
CL
2CL X 1010 – (1 + R2/R1)
R2
CL X 103
RC
(e)
(f)
R2
R1
2kΩ
R2
e1
2kΩ
2kΩ
R1
RC
20Ω
ei
1
1
2
2
2kΩ
eo
eo
OPA2604
OPA2604
CC
RC
20Ω
0.22µF
CL
5000pF
CL
5000pF
R3
2kΩ
RC
R4
CC
0.22µF
e2
2kΩ
R2
RC
CC
=
=
2CL X 1010 – (1 + R2/R1)
R2
=
=
2CL X 1010 – (1 + R2/R1)
CL X 103
RC
CL X 103
RC
CC
NOTE: Design equations and component values are approximate. User adjustment is required for optimum performance.
FIGURE 2. Driving Large Capacitive Loads.
®
9
OPA2604
Copper leadframe construction used in the OPA2604 im-
proves heat dissipation compared to conventional plastic
packages. To achieve best heat dissipation, solder the device
directly to the circuit board and use wide circuit board traces.
POWER DISSIPATION
The OPA2604 is capable of driving 600Ω loads with power
supply voltages up to ±24V. Internal power dissipation is
increased when operating at high power supply voltage. The
typical performance curve, Power Dissipation vs Power Sup-
ply Voltage, shows quiescent dissipation (no signal or no
load) as well as dissipation with a worst case continuous sine
wave. Continuous high-level music signals typically produce
dissipation significantly less than worst case sine waves.
OUTPUT CURRENT LIMIT
Output current is limited by internal circuitry to approxi-
mately ±40mA at 25°C. The limit current decreases with
increasing temperature as shown in the typical curves.
R4
22kΩ
C3
100pF
R1
R2
R3
VIN
1
2
VO
2.7kΩ
22kΩ
10kΩ
OPA2604
C1
3000pF
C2
2000pF
fp = 20kHz
FIGURE 3. Three-Pole Low-Pass Filter.
1
2
R1
R5
VO
OPA2604
VIN
6.04kΩ
2kΩ
R2
C3
1000pF
4.02kΩ
R2
Low-pass
3-pole Butterworth
f–3dB = 40kHz
1
4.02kΩ
2
OPA2604
1
2
OPA2604
C1
1000pF
R4
5.36kΩ
See Application Bulletin AB-026
for information on GIC filters.
C2
1000pF
FIGURE 4. Three-Pole Generalized Immittance Converter (GIC) Low-Pass Filter.
®
OPA2604
10
C1*
I-Out DAC
R1
C2
2200pF
2kΩ
1
2
R2
R3
VO
1
OPA2604
2
OPA2604
COUT
2.94kΩ
21kΩ
C3
470pF
Low-pass
2-pole Butterworth
f–3dB = 20kHz
COUT
2π R1 fc
~
=
* C1
R
1 = Feedback resistance = 2kΩ
fc = Crossover frequency = 8MHz
FIGURE 5. DAC I/V Amplifier and Low-Pass Filter.
10kΩ
10kΩ
1
2
7.87kΩ
OPA2604
–
VIN
+
1
2
100pF
VO
G = 1
OPA2604
1
2
7.87kΩ
100kHz Input Filter
OPA2604
10kΩ
10kΩ
FIGURE 6. Differential Amplifier with Low-Pass Filter.
®
11
OPA2604
COUT
100Ω
10kΩ
* C1
≈
2π Rf fc
Rf = Internal feedback resistance = 1.5kΩ
G = 101
(40dB)
fc = Crossover frequency = 8MHz
1
2
10
5
OPA2604
C1*
PCM63
20-bit
D/A
Piezoelectric
Transducer
6
1
2
9
VO = ±3Vp
1MΩ*
OPA2604
Converter
To low-pass
filter.
* Provides input bias
current return path.
FIGURE 7. High Impedance Amplifier.
FIGURE 8. Digital Audio DAC I-V Amplifier.
1/2 OPA2604
A2
I2
R4
1/2 OPA2604
51Ω
R3
51Ω
A1
IL = I1 + I2
i1
VIN
R2
VOUT
Load
R1
VOUT = VIN (1 + R2/R1)
FIGURE 9. Using the Dual OPA2604 Op Amp to Double the Output Current to a Load.
®
OPA2604
12
PACKAGE OPTION ADDENDUM
www.ti.com
6-Dec-2006
PACKAGING INFORMATION
Orderable Device
OPA2604AP
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
PDIP
P
8
8
8
8
8
8
8
50 Green (RoHS & CU NIPDAU N / A for Pkg Type
no Sb/Br)
OPA2604APG4
OPA2604AU
PDIP
SOIC
SOIC
SOIC
SOIC
SOIC
P
D
D
D
D
D
50 Green (RoHS & CU NIPDAU N / A for Pkg Type
no Sb/Br)
100 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
OPA2604AU/2K5
OPA2604AU/2K5E4
OPA2604AUE4
OPA2604AUG4
2500
Pb-Free
(RoHS)
CU NIPDAU Level-3-260C-168 HR
2500
Pb-Free
(RoHS)
CU NIPDAU Level-3-260C-168 HR
100 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
100 Green (RoHS & CU NIPDAU Level-3-260C-168 HR
no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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