概述
数据手册HFA3-0001-5 概述
Ultra High Slew RateOperational Amplifier 超高摆RateOperational放大器
HFA3-0001-5 数据手册
通过下载HFA3-0001-5数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载HFA-0001
®
September 1998
File Number 2916.3
Ultra High Slew RateOperational Amplifier
Features
• Unity Gain Bandwidth. . . . . . . . . . . . . . . . . . . . . . 350MHz
• Full Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . 53MHz
• High Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . 1000V/µs
• High Output Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50mA
• Monolithic Construction
The HFA-0001 is an all bipolar op amp featuring high slew
rate (1000V/µs), and high unity gain bandwidth (350MHz).
These features combined with fast settling time (25ns) make
this product very useful in high speed data acquisition
systems as well as RF, video, and pulse amplifier designs.
Other outstanding characteristics include low bias currents
(15µA), low offset current (18µA), and low offset voltage
(6mV).
Applications
The HFA-0001 offers high performance at low cost. It can
replace hybrids and RF transistor amplifiers, simplifying
designs while providing increased reliability due to
• RF/IF Processors
• Video Amplifiers
monolithic construction. To enhance the ease of design, the
HFA-0001 has a 50Ω ±20% resistor connected from the
output of the op amp to a separate pin. This can be used
when driving 50Ω strip line, microstrip, or coax cable.
• High Speed Cable Drivers
• Pulse Amplifiers
• High Speed Communications
• Fast Data Acquisition Systems
Part Number Information
PART
NUMBER
TEMPERATURE
RANGE
PACKAGE
o
o
HFA1-0001-5
HFA1-0001-9
HFA3-0001-5
HFA3-0001-9
HFA9P0001-5
0 C to +75 C 14 Lead Ceramic Sidebraze DIP
o
o
-40 C to +85 C 14 Lead Ceramic Sidebraze DIP
o
o
0 C to +75 C 8 Lead Plastic DIP
o
o
-40 C to +85 C 8 Lead Plastic DIP
o
o
0 C to +75 C 16 Lead Widebody SOIC
Pinouts
HFA-0001
(PDIP)
TOP VIEW
HFA-0001
(CDIP)
TOP VIEW
HFA-0001
(300 MIL SOIC)
TOP VIEW
16 NC
15 NC
NC
-IN
+IN
V-
1
2
3
4
8
7
6
5
R
NC
NC
NC
-IN
+IN
V-
1
2
3
4
5
6
7
8
NC
NC
NC
-IN
+IN
V-
1
2
3
4
5
6
7
14 NC
13 NC
SENSE
V+
+
14 R
SENSE
OUT
NC
12
R
SENSE
13 V+
11 V+
+
12 OUT
11 NC
10 NC
+
10 OUT
9
8
NC
NC
NC
NC
NC
9
NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
1
HFA-0001
Absolute Maximum Ratings (Note 1)
Operating Conditions
Supply Voltage (Between V+ and V- Terminals) . . . . . . . . . . . . .12V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4V
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
Operating Temperature Range
HFA-0001-9 . . . . . . . . . . . . . . . . . . . . . . . . . .-40 C ≤ T ≤ +85 C
HFA-0001-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 C ≤ T ≤ +75 C
Storage Temperature Range . . . . . . . . . . . . . .-65 C ≤ T ≤ +150 C
o
o
A
A
o
o
o
o
A
o
Junction Temperature (Note 9) . . . . . . . . . . . . . . . . . . . . . . .+175 C
o
o
Junction Temperature (Plastic Package). . . . . . . . . . . . . . . .+150 C
Lead Temperature (Soldering 10 Sec.) . . . . . . . . . . . . . . . . .+300 C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications V+ = +5V, V- = -5V, Unless Otherwise Specified
HFA-0001-9
TYP
HFA-0001-5
TYP
PARAMETER
INPUT CHARACTERISTICS
TEMP
MIN
MAX
MIN
MAX
UNITS
o
Offset Voltage
+25 C
-
-
6
4.5
12.5
50
15
20
45
-
-
-
6
4.5
12.5
50
30
mV
mV
mV
High
Low
High
Low
30
-
-
35
o
Average Offset Voltage Drift
Bias Current
-
-
-
µV/ C
o
-
100
15
-
-
100
15
-
µV/ C
o
+25 C
-
50
50
25
50
-
-
100
µA
µA
Full
-
20
-
20
100
o
Offset Current
+25 C
-
18
-
18
50
50
-
µA
Full
-
22
-
22
µA
o
Common Mode Range
Differential Input Resistance
Input Capacitance
+25 C
±3
-
-
±3
-
-
V
o
+25 C
10
-
10
-
kΩ
o
+25 C
-
2
-
-
2
-
pF
o
Input Noise Voltage
0.1Hz to 10Hz
10Hz to 1MHz
+25 C
-
3.5
6.7
640
170
6
-
-
3.5
6.7
640
170
6
-
µVrms
µVrms
nV/√Hz
nV/√Hz
nV/√Hz
nA/√Hz
nA/√Hz
nA/√Hz
o
+25 C
-
-
-
-
o
Input Noise Voltage
Input Noise Current
f
f
f
f
f
f
= 10Hz
+25 C
-
-
-
-
O
O
O
O
O
O
o
= 100Hz
= 100kHz
= 10Hz
+25 C
-
-
-
-
o
+25 C
-
-
-
-
o
+25 C
-
2.35
0.57
0.16
-
-
2.35
0.57
0.16
-
o
= 100Hz
= 1000Hz
+25 C
-
-
-
-
o
+25 C
-
-
-
-
TRANSFER CHARACTERISTICS
Large Signal Voltage Gain (Note 2)
o
+25 C
150
150
150
45
40
45
-
200
170
220
47
-
-
-
-
-
-
-
-
150
100
150
42
40
42
-
200
170
220
47
-
-
-
-
-
-
-
-
V/V
V/V
V/V
dB
High
Low
o
Common Mode Rejection Ratio (Note 3)
+25 C
High
Low
45
45
dB
48
48
dB
o
Unity Gain Bandwidth
+25 C
350
-
350
-
MHz
V/V
Minimum Stable Gain
Full
1
1
OUTPUT CHARACTERISTICS
o
Output Voltage Swing
R
= 100Ω
+25 C
-
±3.5
-
-
±3.5
-
V
L
2
HFA-0001
Electrical Specifications V+ = +5V, V- = -5V, Unless Otherwise Specified (Continued)
HFA-0001-9
HFA-0001-5
PARAMETER
TEMP
MIN
±3.5
±3.0
±3.5
-
TYP
±3.7
±3.6
±3.7
53
MAX
MIN
±3.5
±3.0
±3.5
-
TYP
±3.7
±3.6
±3.7
53
MAX
UNITS
V
o
R
= 1kΩ
+25 C
-
-
-
-
-
-
-
-
-
-
-
-
L
High
Low
V
V
o
Full Power Bandwidth (Note 5)
Output Resistance, Open Loop
Output Current
+25 C
MHz
Ω
o
+25 C
-
3
-
3
Full
±30
±50
±30
±50
mA
TRANSIENT RESPONSE
Rise Time (Note 4, 6)
o
+25 C
-
-
-
-
-
480
1000
875
25
-
-
-
-
-
-
-
-
-
-
480
1000
875
25
-
-
-
-
-
ps
V/µs
V/µs
ns
o
Slew Rate (Note 4, 7)
R
R
= 1kΩ
+25 C
L
L
o
= 100Ω
+25 C
o
Settling Time (3V Step)
Overshoot (Note 4, 6)
0.1%
+25 C
o
+25 C
36
36
%
POWER SUPPLY CHARACTERISTICS
Supply Current
Full
-
65
42
41
42
75
-
-
65
42
41
42
75
-
mA
dB
dB
dB
o
Power Supply Rejection Ratio (Note 8)
+25 C
40
35
40
37
35
37
High
Low
-
-
-
-
NOTES:
1. Absolute Maximum Ratings are limiting values applied individually beyond which the serviceability of the circuit may be impaired. Functional
operation under any of these conditions is not necessarily implied.
2. V
= 0 to ±2V, R = 1kΩ.
= ±2V.
OUT
3. ∆V
L
CM
4. R = 100Ω.
L
SlewRate
5. Full Power Bandwidth is calculated by equation: FPBW = ----------------------------, V
= 3.0V .
PEAK
2πV
PEAK
6. V
7. V
= ±200mV, A = +1.
V
= ±3V, A = +1.
OUT
OUT
V
8. ∆V = ±4V to ±6V.
S
9. See Thermal Constants in ‘Applications Information’ text. Maximum power dissipation, including output load, must be designed to maintain the
o
o
junction temperature below +175 C for hermetic packages, and below +150 C for plastic packages.
Schematic Diagram
Die Characteristics
Thermal Constants ( C/W)
o
θ
θ
JC
V+
JA
HFA1-0001-5/-9
HFA3-0001-5
HFA9P-0001-5/-9
75
98
96
13
36
27
R
SENSE
V
-IN
+IN
OUT
V-
3
HFA-0001
Test Circuits
V
+
V
+
IN
IN
V
V
OUT
OUT
50Ω
50Ω
20pF
1kΩ
100Ω
50Ω
50Ω
FIGURE 1. LARGE SIGNAL RESPONSE TEST CIRCUIT
FIGURE 2. SMALL SIGNAL RESPONSE TEST CIRCUIT
LARGE SIGNAL RESPONSE
= 0V to 3V
SMALL SIGNAL RESPONSE
= 0mV to 200mV
V
V
OUT
OUT
Vertical Scale: 1V/Div.
Vertical Scale: 100mV/Div.
HorizontalScale: 2ns/Div.
Horizontal Scale: 2ns/Div.
V
IN
V
IN
V
OUT
V
OUT
NOTE: Initial Step In Output Is Due To Fixture Feedthrough
PROPAGATION DELAY
Vertical Scale: 500mV/Div.
Horizontal Scale: 2ns/Div.
A
= +1, R = 100Ω, V = 0V to 3V
V
L
OUT
V
SETTLE
1kΩ
1kΩ
100Ω
V
100Ω
IN
V
OUT
+
FIGURE 3. SETTLING TIME SCHEMATIC
NOTE: Test Fixture Delay of 450ps is Included
4
HFA-0001
o
Typical Performance Curves V = ±5V, T = +25 C, Unless Otherwise Specified
S
A
50
40
30
20
10
0
V
V
IN
OUT
50Ω
100Ω
GAIN
20
10
50Ω
0
-10
-20
GAIN
180
135
90
45
0
180
135
90
PHASE
PHASE
45
R
= 100Ω
L
A
= +1, R = 100Ω, R = 50Ω
L F
V
0
1M
10M
100M
1G
100K
1M
10M
FREQUENCY (Hz)
100M
1G
FREQUENCY (Hz)
FIGURE 4. OPEN LOOP GAIN AND PHASE vs FREQUENCY
FIGURE 5. CLOSED LOOP GAIN vs FREQUENCY
V
V
IN
OUT
20
30
20
10
0
50Ω
100Ω
10
0
100Ω
V
IN
50Ω
V
OUT
100Ω
900Ω
100Ω
-10
-20
-10
180
135
90
45
0
180
135
90
45
0
A
= +10
V
L
R
= 100Ω
1M
100K
1M
10M
100M
1G
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 6. CLOSED LOOP GAIN vs FREQUENCY
FIGURE 7. CLOSED LOOP GAIN vs FREQUENCY
80
70
700
A
V
= +1, R = 100Ω
V
L
= 0mV to 200mV
OUT
600
500
400
300
200
100
60
50
40
30
20
10
0
100K
1M
10M
100M
1G
-60
-40
-20
0
20
40
60
o
80
100 120
FREQUENCY (Hz)
TEMPERATURE ( C)
FIGURE 8. RISE TIME vs TEMPERATURE
FIGURE 9. CMRR vs FREQUENCY
5
HFA-0001
o
Typical Performance Curves V = ±5V, T = +25 C, Unless Otherwise Specified (Continued)
S
A
80
70
60
50
40
30
20
10
0
25
20
15
10
5
-PSRR
0
+PSRR
-5
-10
-15
-20
-60
-40
-20
0
20
40
60
o
80 100
120
100K
1M
10M
FREQUENCY (Hz)
100M
1G
TEMPERATURE ( C)
FIGURE 10. PSRR vs FREQUENCY
FIGURE 11. OFFSET VOLTAGE vs TEMPERATURE
(3 REPRESENTATIVE UNITS)
20
40
15
10
5
30
20
10
0
0
-5
-10
-15
-20
-10
-20
-25
-60
-60
-40
-20
0
20
40
60
o
80
100 120
-40
-20
0
20
40
60
o
80
100 120
TEMPERATURE ( C)
TEMPERATURE ( C)
FIGURE 12. BIAS CURRENT vs TEMPERATURE
(3 REPRESENTATIVE UNITS)
FIGURE 13. OFFSET CURRENT vs TEMPERATURE
(3 REPRESENTATIVE UNITS)
4.6
300
280
260
240
220
200
180
160
140
120
100
80
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
-A
VOL
-V
OUT
+A
VOL
+V
OUT
60
40
R
= 1kΩ
L
R
= 1kΩ, V
= 0V to ±2V
20
L
OUT
0
-60
-60
-40
-20
0
20
40
60
o
80
100 120
-40
-20
0
20
40
60
80
100 120
o
TEMPERATURE ( C)
TEMPERATURE ( C)
FIGURE 15. OUTPUT VOLTAGE SWING vs TEMPERATURE
FIGURE 14. OPEN LOOP GAIN vs TEMPERATURE
6
HFA-0001
o
Typical Performance Curves V = ±5V, T = +25 C, Unless Otherwise Specified (Continued)
S
A
60
58
56
54
52
50
48
46
44
42
40
38
36
34
1200
1100
1000
900
A
V
= +1, R = 100Ω
L
V
= ±3V
OUT
-SLEW RATE
+SLEW RATE
-CMRR
+CMRR
800
700
600
500
-60
-40
-20
0
20
40
60
o
80
100 120
-60
-40
-20
0
20
40
60
80 100
120
o
TEMPERATURE ( C)
TEMPERATURE ( C)
FIGURE 16. SLEW RATE vs TEMPERATURE
FIGURE 17. CMRR vs TEMPERATURE
90
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
∆V = ±4V TO ±6V
S
-PSRR
+PSRR
-60
-40
-20
0
20
40
60
o
80
100 120
0
1
2
3
4
5
SUPPLY VOLTAGE (±V)
TEMPERATURE ( C)
FIGURE 18. PSRR vs TEMPERATURE
FIGURE 19. SUPPLY CURRENT vs SUPPLY VOLTAGE
70
68
66
64
62
60
58
56
54
52
50
48
5.0
A
= +1, R = 100Ω
L
V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
THD < 1%
0.5
0
46
44
-60
-40
-20
0
20
40
60
o
80
100 120
1M
10M
100M
1G
FREQUENCY (Hz)
TEMPERATURE ( C)
FIGURE 20. SUPPLY CURRENT vs TEMPERATURE
FIGURE 21. MAXIMUM OUTPUT VOLTAGE SWINGvs FREQUENCY
7
HFA-0001
o
Typical Performance Curves V = ±5V, T = +25 C, Unless Otherwise Specified (Continued)
S
A
240
220
200
180
160
140
120
100
80
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= ±2V
OUT
A
= +1, f = 50kHz
O
V
THD < 1%
-A
VOL
VOL
+A
60
40
10
100
1K
10K
10
100
1K
10K
LOAD RESISTANCE (Ω)
LOAD RESISTANCE (Ω)
FIGURE 22. OUTPUT VOLTAGE SWING vs LOAD RESISTANCE
FIGURE 23. OPEN LOOP GAIN vs LOAD RESISTANCE
600
500
600
500
8
7
6
8
7
6
400
300
200
400
300
200
5
4
3
2
5
4
3
2
NOISE CURRENT
NOISE VOLTAGE
NOISE CURRENT
100
100
NOISE VOLTAGE
1
0
1
0
0
100
0
1
10
100
1K
10K
100K
1K
10K
100K
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 24. INPUT NOISE vs FREQUENCY
FIGURE 25. INPUT NOISE vs FREQUENCY
FIGURE 26. INPUT VOLTAGE NOISE 0.1Hz to 10Hz
= 50, Noise Voltage = 1.605µVrms (RTI)
FIGURE 27. INPUT NOISE VOLTAGE 10Hz to 1MHz
= 50, Noise Voltage = 5.36µVrms (RTI)
A
A
V
V
Noise Voltage = 10.12µV
Noise Voltage = 29.88µV
P-P
P-P
8
HFA-0001
This 50Ω resistor can be used as the series resistor instead
of an external resistor.
Applications Information
Offset Adjustment
V
IN
When applications require the offset voltage to be as low as
possible, the figure below shows two possible schemes for
adjusting offset voltage.
50Ω COAX CABLE
V
OUT
50Ω
+
50Ω
For a voltage follower application, use the circuit in Figure 29
R
F
without R and with R shorted. R should be 1MΩ to 10MΩ.
2
I
1
The adjustment resistors will cause only a very small gain error.
FIGURE 30.
R
F
PC board traces can be made to look like a 50Ω or 75Ω
transmission line, called microstrip. Microstrip is a PC board
trace with a ground plane directly beneath, on the opposite
side of the board, as shown in Figure 31.
+5V
R
I
V
IN
-
+
V
OUT
50kΩK
R
1
R
100
2
100kΩ
SIGNAL
TRACE
-5V
w
t
R
2
Adjustment Range ≅ ±V -------
R
1
h
E
R
FIGURE 28. INVERTING GAIN
DIELECTRIC
(PC BOARD)
GROUND
PLANE
FIGURE 31.
V
+
-
IN
R
+V
V
OUT
When manufacturing pc boards, the trace width can be
calculated based on a number of variables. The following
equation is reasonably accurate for calculating the proper
trace width for a 50Ω transmission line.
R
1
100kΩ
I
50kΩ
R
F
R
2
100Ω
-V
87
5.98h
0.8w + t
Z
= ------------------------------ ln ------------------- Ω
O
E
+ 1.41
R
R
R
2
F
Adjustment Range ≅ ±V -------
Gain ≅ 1 + -------------------
R
1
R + R
I
2
Power supply decoupling is essential for high frequency op
amps. A 0.01µF high quality ceramic capacitor at each
supply pin in parallel with a 1µF tantalum capacitor will
provide excellent decoupling as shown in Figure 32.
FIGURE 29. NON-INVERTING GAIN
PC Board Layout Guidelines
When designing with the HFA-0001, good high frequency
(RF) techniques should be used when making a PC board. A
massive ground plane should be used to maintain a low
impedance ground. Proper shielding and use of short
interconnection leads are also very important.
V+
1.0µF
0.01µF
To achieve maximum high frequency performance, the use
of low impedance transmission lines with impedance
matching is recommended: 50Ω lines are common in
communications and 75Ω lines in video systems. Impedance
matching is important to minimize reflected energy therefore
minimizing transmitted signal distortion. This is
+
0.01µF
1.0µF
accomplished by using a series matching resistor (50Ω or
75Ω), matched transmission line (50Ω or 75Ω), and a
matched terminating resistor, as shown in Figure 30. Note
that there will be a 6dB loss from input to output.The HFA-
0001 has an integral 50Ω ±20% resistor connected to the op
amps output with the other end of the resistor pinned out.
V-
FIGURE 32. POWER SUPPLY DECOUPLING
9
HFA-0001
Thermal Management
V+
C
The HFA-0001 can sink and source a large amount of
current making it very useful in many applications. Care
must be taken not to exceed the power handling capability of
the part to insure proper performance and maintain high
reliability. The following graph shows the maximum power
handling capability of the HFA-0001 without exceeding the
R
+
C
C
o
maximum allowable junction temperature of +175 C. The
curves also show the improved power handling capability
when heatsinks are used based on AVVID heatsink #5801B
for the 8 lead Plastic DIP and IERC heatsink #PEP50AB for
the 14 lead Sidebraze DIP. These curves are based on
natural convection. Forced air will greatly improve the power
dissipation capabilities of a heatsink.
R
C
V-
3.0
FIGURE 33. IMPROVED DECOUPLING/CURRENT LIMITING
2.8
B
Chip capacitors produce the best results due to ease of
placement next to the op amp and they have negligible lead
inductance. If leaded capacitors are used, the leads should
be kept as short as possible to minimize lead inductance.
Figures 32 and 33 illustrate two different decoupling
schemes. Figure 33 improves the PSRR because the
resistor and capacitors create low pass filters. Note that the
supply current will create a voltage drop across the resistor.
2.6
2.4
A
2.2
2.0
1.8
D
1.6
1.4
C
1.2
1.0
0.8
A: 8 LEAD PLASTIC DIP WITH HEATSINK
B: 14 LEAD SIDEBRAZE DIP WITH HEATSINK
C: 8 LEAD PLASTIC DIP ONLY
D: 14 LEAD SIDEBRAZE DIP ONLY
0.6
Saturation Recovery
0.4
When an op amp is over driven output devices can saturate
and sometimes take a long time to recover. By clamping the
input to safe levels, output saturation can be avoided. If
output saturation cannot be avoided, the recovery time from
25% over-drive is 20ns and 30ns from 50% over-drive.
0.2
0
20
40
60
80
100
o
120
AMBIENT TEMPERATURE ( C)
FIGURE 34.
10
HFA3-0001-5 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| HFA3-0001-9 | INTERSIL | Ultra High Slew RateOperational Amplifier | 获取价格 |
|
| HFA3-0002-5 | INTERSIL | Low Noise Wideband Operational Amplifier | 获取价格 |
|
| HFA3-0002-5 | ROCHESTER | OP-AMP, 1000uV OFFSET-MAX, 1000MHz BAND WIDTH, PDIP8, PACKAGE-8 | 获取价格 |
|
| HFA3-0002-9 | INTERSIL | Low Noise Wideband Operational Amplifier | 获取价格 |
|
| HFA3-0003-5 | INTERSIL | Ultra High Speed Comparator | 获取价格 |
|
| HFA3-0003-9 | INTERSIL | Ultra High Speed Comparator | 获取价格 |
|
| HFA3-0003L-5 | INTERSIL | Ultra High Speed Comparator | 获取价格 |
|
| HFA3-0003L-9 | INTERSIL | Ultra High Speed Comparator | 获取价格 |
|
| HFA3-0003L-9 | RENESAS | COMPARATOR, 4000uV OFFSET-MAX, PDIP16 | 获取价格 |
|
| HFA3-0003L-9 | ROCHESTER | COMPARATOR, 4000uV OFFSET-MAX, PDIP16 | 获取价格 |
|
HFA3-0001-5 相关文章
Bourns 密封通孔金属陶瓷微调电位计产品选型手册(英文版)
- 2024-09-20
- 6
Bourns 精密环境传感器产品选型手册(英文版)
- 2024-09-20
- 9
Bourns POWrTher 负温度系数(NTC)热敏电阻手册 (英文版)
- 2024-09-20
- 8
Bourns GMOV 混合过压保护组件产品选型手册(英文版)
- 2024-09-20
- 6
