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ICs for TV
AN5870K
Wide bandwidth analog switch IC
s Overview
The AN5870K is a wide bandwidth analog switch IC of 300 MHz operation. It is usable for RGB signal and horizontal/vertical synchronizing signals, and it has a built-in 75 driver for video signal. In addition, it has also realized a high speed operation by the adoption of CMOS process for its sync. signal processing circuit. It is usable in a broad range from a popular type monitor to a high definition monitor.
1 30
Unit: mm
0.50.1 0.90.25
26.70.3
s Features
* 2-input 1-output circuit (DC switch type) * Built-in 6 dB amplifier for RGB signal (1.5 dB for 75 termination) * Built-in sync. separation circuit (Supporting sync. on green and power save) * Higher speed horizontal / vertical sync. signal circuit (tdelay = 20 ns)
15 8.60.3
16 4.70.25 1.00.25 3.30.25
3 to 15
10.160.25
0.35-0.0
+0.1
5
SDIP030-P-0400
s Applications
* Monitors
1.778
1
AN5870K
s Block Diagram
ICs for TV
R-in1
1
30
VCC2 (12 V)
GND (R)
2 6 dB
29
R-out
R-in2
3
28
VCC2
VCC1 (5 V)
4 6 dB
27
G-out
G-in1
5
26
GND (R, G, B)
GND (G)
6
25
G sync.
G-in2
7
24
GND (R, G, B)
VCC1 (5 V)
8 6 dB
23
B-out
B-in1
9
22
SW
GND (B)
10
Sw select bias
Sync. sep
21
Sync. in
B-in2
11 Hsync detect sw
20
H Pdet.
VCC1 (5 V)
12
19
H-out
H-in1
13
18
V-out
H-in2
14
17
GND (HV, HSEP, SW)
V-in1
15
16
V-in2
2
ICs for TV
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 R input 1 GND (R) R input 2 VCC1 5 V (G sync.) G input 1 GND (G) G input 2 VCC1 5 V (RGB) B input 1 GND (B) B input 2 VCC1 5 V (HV, HSEP, SW) H input 1 H input 2 V input 1 Description Pin No. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 V input 2 GND (HV, HSEP, SW) V output H output H detect Sync. input SW B output GND (RGB) G sync. output GND (RGB) G output VCC2 12 V (RGB) R output VCC2 12 V (RGB) Description
AN5870K
s Absolute Maximum Ratings
Parameter Supply voltage Symbol VCC1 (pin 4, pin 8, pin 12) VCC2 (pin 28, pin 30) Supply current
*2 *1
Rating 5.5 12.9 22.5 75.8 1.143 -20 to +70 -55 to +150
Unit V
ICC1 (pin 4, pin 8, pin 12) ICC2 (pin 28, pin 30)
mA
Power dissipation
PD Topr Tstg
*1
W C C
Operating ambient temperature Storage temperature
Note) For the precautions related to surge and latch-up, refer to "s Usage Notes". *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: The power dissipation shown is for the independent IC package without a heat sink in free air at Ta = 70C
s Recommended Operating Range
Parameter Supply voltage Symbol VCC1 VCC2 Range 4.5 to 5.25 10.5 to 12.6 Unit V
3
AN5870K
s Electrical Characteristics at Ta = 25C
Parameter Power supply Supply current (1) Supply current (2) Signal processing system Input DC voltage 1 Input DC voltage 2 Output DC voltage 1 Output DC voltage 2 Output DC voltage 3 Input impedance (1) Input impedance (2) Output impedance (1) Output impedance (2) Gain (1) Relative gain (1) Gain (2) Relative gain (2) Gain (3) Frequency characteristics 1 (100 MHz) Relative frequency characteristics 1 (100 MHz) Relative frequency characteristics 2 (100 MHz) Relative frequency characteristics 2 (100 MHz) Crosstalk between RGB 1 (10 MHz) Crosstalk between RGB 2 (10 MHz) Crosstalk between 2 inputs (1) (10 MHz) Crosstalk between 2 inputs (2) (10 MHz) VI1 VI2 VO1 VO2 VO3 RI1 RI2 RO1 RO2 GV1 GV1 GV2 GV2 GV3 fC1 Pin 22: 0 V, pins 1, 5, 9: DC Pin 22: 5 V, pins 3, 7, 11: DC Pin 22: 0 V, pins 23, 27, 29: DC Pin 22: 5 V, pins 23, 27, 29: DC Pin 25: DC Pin 22: 0 V, pins 1, 5, 9: Measurement Pin 22: 5 V, pins 3, 7, 11: Measurement Pin 23, 27, 29: Measurement Pin 25: Measurement Pin 22: 0 V, pins 1, 5, 9: SG1 signal, pins 23, 27, 29: Measurement Relative difference to GV1 Pin 22: 5 V, pin 3, 7, 11: SG1 signal, pins 23, 27, 29: Measurement Relative difference to GV2 Pin 22: 0 V or 5 V, pin 5 or 7: SG1 signal, pins 23, 27, 29: Measurement Pin 22: 0 V, difference from GV1, pins 1, 5, 9: SG4 signal, pins 23, 27, 29: Measurement Relative difference to fC1 Pin 22: 5 V, difference from GV2, pins 3, 7, 11: SG4 signal, pins 23, 27, 29: Measurement Relative difference to fC2 Pin 22: 0 V, pin 1 or 5 or 9: SG2 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 3 or 7 or 11: SG2 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 1 or 5 or 9: SG2 signal, pins 29, 27, 23: Measurement Pin 22: 0 V, pin 3 or 7 or 11: SG2 signal, pins 29, 27, 23: Measurement 2.6 2.6 5.7 5.7 1.9 85 85 60 50 0.5 - 0.4 0.5 - 0.4 -2.0 -1.3 2.9 2.9 6.2 6.2 2.3 100 100 70 70 1.5 0.0 1.5 0.0 - 0.5 - 0.3 ICC1 ICC2 Current at V4, V8, V12 = 5 V Current at V28, V30 = 12 V 13.0 46.0 16.0 60.0 Symbol Conditions Min Typ
ICs for TV
Max
Unit
19.0 70.0
mA mA
3.2 3.2 6.7 6.7 2.7 115 115 80 90 2.5 0.4 2.5 0.4 0.5 0.7
V V V V V k k dB dB dB dB dB dB
fC1 fC2
- 0.5 -1.3
0.0 - 0.3
0.5 0.7
dB dB
fC2 CTC1 CTC2 CTI1 CTI2
- 0.5
0.0 -50 -50 -60 -60
0.5 -45 -45 -50 -50
dB dB dB dB dB
4
ICs for TV
s Electrical Characteristics at Ta = 25C (continued)
Parameter HV circuit system High level output voltage (1) High level output voltage (2) Low level output voltage (1) Low level output voltage (2) Input threshold voltage (1) Input threshold voltage (2) HDET voltage VOH(H) VOH(V) VOL(H) VOL(V) VITH(H) VITH(V) VO(DET) Pin 20: 2.5 V, pin 19: Measurement, pin 13 or 14: 5 V, pin 22: 0 V or 5 V Pin 18: Measurement, pin 15 or 16: 5 V, pin 22: 0 V or 5 V Pin 20 2.5 V, pin 19: Measurement, pin 13 or 14: 0 V, pin 22: 0 or 5 V Pin 18: Measurement, pin 15 or 16: 0 V, pin 22: 0 V or 5 V Pin 20: 2.5 V, pin 19: Measurement, pin 13 or 14: 0 to 5 input, pin 22: 0 V or 5 V Pin 18: Measurement, pin 15 or 16: 0 to 5 input, pin 22: 0 V or 5 V Pin 22: 0 V, pin 13: SG6 signal, pin 20: DC measurement 4.5 4.5 0.0 0.0 1.2 1.2 2.2 1.5 1.5 2.5 Symbol Conditions Min Typ
AN5870K
Max
Unit
5.0 5.0 0.5 0.5 1.8 1.8 2.8
V V V V V V V
Sync. separation circuit system Input clamp voltage Minimum sync. separation level SW System Switch threshold voltage VITH(SW) Measurement when pin 15: DC 5 V, pin 16: DC 0 V, pin 22: 0 V to 2.5 V and pin 18: Becomes 0 V 1.2 1.7 2.2 V VC1 VSmin Pin 21: DC measurement Pin 21: SG8 signal, pin 19: Sync. level measurement 1.0 1.35 1.7 100 V mV
Signal processing system Input dynamic range (1) Input dynamic range (2) G-sync. dynamic range Gain with power supply fluctuation (1) Gain with power supply fluctuation (2) Frequency characteristics 3 (300 MHz) Relative frequency characteristics 3 (300 MHz) Frequency characteristics 4 (300 MHz) VDI1 VDI2 VD0 GVH GVL fC3 Pin 22: 0 V, pins 1, 5, 9: Input sweep, pins 23, 27, 29: Measurement Pin 22: 5 V, Pin 3, 7, 11: Input sweep, pins 23, 27, 29: Measurement Pin 22: 0 V or 5 V, pin 5 or 7: Input sweep, pin 25: Measurement VCC1 = 5.25, VCC2 = 12.6, like GV1, GV2, difference from typ. VCC1 = 4.75, VCC2 = 11.4, like GV1, GV2, difference from typ. Pin 22: 0 V, difference form value at 1MHz, pins 1, 5, 9: SG5 signal, pins 23, 27, 29: Measurement Relative difference to fC3 Pin 22: 5 V, difference form value at 1 MHz, pins 3, 7, 11: SG5 signal, pins 23, 27, 29: Measurement 2.5 2.5 2.5 - 0.5 - 0.5 -3.5 3.0 3.0 3.0 0.0 0.0 -2.0 +0.5 +0.5 - 0.5 V V V dB dB dB
fC3 fC4
-1.5 -3.5
0.0 -2.0
+1.5 - 0.5
dB dB
5
AN5870K
s Electrical Characteristics at Ta = 25C (continued)
Parameter Symbol fC4 Conditions Min -1.5 -4.0 Typ
ICs for TV
Max +1.5 -1.0 +0.5 +0.5 +1.0 -30 -30 -40 -40
Unit
Signal processing system (continued) Relative frequency characteristics 4 (300 MHz) Relative difference to fC4 Pin 22: 0 V or 5 V, pin 5 or 7: SG3 signal, pin 25: Measurement 0.0 -2.5 0.0 0.0 0.0 -40 -40 -50 -50 -25 -25 -30 -30 1.2 1.2 1.2 1.2 1.6 dB dB dB dB dB dB dB dB dB dB dB dB dB ns ns ns ns
G-sync. frequency characteristics fCGS (35 MHz) Relative gain between 2 inputs Relative frequency characteristics between 2 inputs (1) Relative frequency characteristics between 2 inputs (2) Crosstalk between RGB 3 (100 MHz) Crosstalk between RGB 4 (100 MHz) Crosstalk between 2 inputs (3) (100 MHz) Crosstalk between 2 inputs (4) (100 MHz) Crosstalk between RGB 5 (300 MHz) Crosstalk between RGB 6 (300 MHz) Crosstalk between 2 inputs 5 (300 MHz) Crosstalk between 2 inputs 6 (300 MHz) Rise time (1) Rise time (2) Fall time (1) Fall time (2) Output VSWR/75 GVCH1 fC1 fC2 CTC3 CTC4 CTI3 CTI4 CTC5 CTC6 CTI5 CTI6 tr1 tr2 tf1 tf2 o
Relative difference at 1 MHz between - 0.5 same channel of GV1 and GV2 Relative difference at 100 MHz between - 0.5 the same channels of fC1 and fC2 Relative difference at 300MHz between the same channels of fC3 and fC4 Pin 22: 0 V, pin 1 or 5 or 9: SG4 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 3 or 7 or 11: SG4 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 1 or 5 or 9: SG4 signal, pins 29, 27, 23: Measurement Pin 22: 0 V, pin 3 or 7 or 11: SG4 signal, pins 29, 27, 23: Measurement Pin 22: 0 V, pin 1 or 5 or 9: SG5 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 3 or 7 or 11: SG5 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 1 or 5 or 9: SG5 signal, pins 23, 27, 29: Measurement Pin 22: 0 V, pin 3 or 7or 11: SG5 signal, pins 23, 27, 29: Measurement Pin 22: 0 V, pin 1 or 5 or 9: SG9 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 3 or 7or 11: SG9 signal, pins 23, 27, 29: Measurement Pin 22: 0 V, pin 1 or 5 or 9: SG9 signal, pins 23, 27, 29: Measurement Pin 22: 5 V, pin 3 or 7or 11: SG9 signal, pins 23, 27, 29: Measurement Pin 23 or 27 or 29: SG5 signal, voltage standing ratio measurement -1.0
6
ICs for TV
s Electrical Characteristics at Ta = 25C (continued)
Parameter HV circuit system Rise time (1) Rise time (2) Fall time (1) Fall time (2) Rise delay time (1) Rise delay time (2) Fall delay time (1) Fall delay time (2) Output impedance (3) Sync. separation circuit system Rise time Fall time Rise delay time Fall delay time Slice level tr(SY) tf(SY) trD(SY) tfD(SY) IS1 Pin 21: SG7 signal, pin 19: Measurement Pin 21: SG7 signal, pin 19: Measurement Pin 21: SG7 signal, pin 19: Measurement Pin 21: SG7 signal, pin 19: Measurement Pin 21: 2 V, pin 21 sink current value measurement 4.2 2 2 2 2 5.6 tr(H) tr(V) tf(H) tf(V) trD(H) trD(V) tfD(H) tfD(V) RO3 Pin 19: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 18: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 19: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 18: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 19: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 18: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 19: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 18: Measurement, pin 13 or 14: SG6 signal, pin 22: 0 V or 5 V Pin 18 or 19: Measurement 2 2 2 2 20 10 15 10 70 Symbol Conditions Min Typ
AN5870K
Max 50 40 45 40 7.0
Unit
ns ns ns ns ns ns ns ns
ns ns ns ns A
7
AN5870K
s Electrical Characteristic (continued)
* Input signal for testing Name Input signal Sine wave (f = 1 MHz, amplitude 1 V[p-p])
ICs for TV
SG1
1 V[p-p]
SG2
Sine wave (f = 10 MHz, amplitude 1 V[p-p])
SG3
Sine wave (f = 35 MHz, amplitude 1 V[p-p])
SG4
Sine wave (f = 100 MHz, amplitude 1 V[p-p])
SG5
Sine wave (f = 300 MHz, amplitude 1 V[p-p]) Square wave (f = 62.5 kHz, amplitude 5 VOP, duty cycle 50%)
5V
SG6
0V
Square wave (f = 62.5 kHz, amplitude 1 V[p-p], low period 1 s)
SG7
1 V[p-p]
SG8
Square wave (f = 62.5 kHz, amplitude 0.1 V[p-p], low period 1 s)
SG9
Square wave (f = 62.5 kHz, amplitude 0.7 V[p-p], low period 1 s)
8
ICs for TV
s Terminal Equivalent Circuits
Pin No. 1
5 V (pin 8)
AN5870K
Equivalent circuit
Description R signal input pin 1: Input through a capacitor
Pin voltage (V) Input with sync. signal (typ.) 1.0 V[p-p] DC 2.9 V
Pins 1,5,9 1 F 75 1%
200
100 k 2.9 V 140 A
2 3
5 V (pin 8)
GND pin for 5 V: For R signal circuit R signal input pin 2: Input through a capacitor
GND Input with sync. signal (typ.) 1.0 V[p-p] DC 2.9 V
Pins 3,7,11 1 F 75 1%
200
100 k 2.9 V 140 A
4 5 6 7 8 9 10 11 12
Refer to pin 1 Refer to pin 3 Refer to pin 1 Refer to pin 3
Power supply pin for 5 V: For G sync. circuit output G signal input pin 1: Input through a capacitor GND pin for 5 V: For G signal circuit G signal input pin 2: Input through a capacitor Power supply pin for 5V: For RGB signal circuit B signal input pin 1: Input through a capacitor GND pin for 5 V: For B signal circuit B signal input pin 2: Input through a capacitor Power supply pin for 5 V: HV * Sync. separation * For SW circuit
5V Refer to pin 1 GND Refer to pin 3 5V Refer to pin 1 GND Refer to pin3 5V
9
AN5870K
s Terminal Equivalent Circuits (continued)
Pin No. 13
5 V (pin 12) 15 k Pins 13,15 4 k 1 k
ICs for TV
Equivalent circuit
Description H. sync. signal input pin 1:
Pin voltage (V) (typ.) High-level: 5 V Low-level: 0 V threshold voltage: 1.5 V
50 k 500
14
5 V (pin 12) 15 k Pins 14,16 4 k 1 k
H. sync. signal input pin 2:
(typ.) High-level: 5 V Low-level: 0 V threshold voltage: 1.5 V
50 k 500
15 16 17
Refer to pin 13 Refer to pin 14
V sync. signal output pin 1: V sync. signal output pin 2: GND pin for 5 V: HV * Sync. separation * For SW circuit V sync. signal output pin:
Refer to pin 13 Refer to pin 14 GND
18
5 V (pin 12)
(typ.) High-level: 5 V Low-level: 0 V
Pins 18,19
19
H. sync. signal output pin:
10
ICs for TV
s Terminal Equivalent Circuits (continued)
Pin No. 20
5 V (pin 12) 20 A 100 A 200
AN5870K
Equivalent circuit
Description
Pin voltage (V)
H. sync. signal detection pin: When detecting high-level * Pin 20 gives priority to high-level signal signal output H. sync. signal present: H. sync. signal output H. sync. not present: (typ.) 2.5 V
20
0.1 A
30 k 200 100 2.5 V 1 k 50 A
Sync. separation circuit output
21
5 V (pin 12)
Sync. separation circuit input pin: * Sync. slice level is determined by the external resistor R. Referring to the following equation, adjust slice
2.0 V
Sync. signal (typ.) 0.3 V[p-p] DC 1.35 V
0.15 F
50 200 3.4 k 5.6 A
21
R
level according to equipment set;
Slice level = R * 5.6 (A) Input frequency * Sync. width
* Open when the pin is unused.
22
25 A
5 V (pin 12) 150 A
Input changeover signal input pin: * When input is high: Input pin 2 is selected (pins 3, 7, 11, 14, 16) When input is low: Input pin 1 is selected (pins 1, 5, 9, 13, 15)
(typ.) High-level: 5 V Low-level: 0 V threshold voltage: 1.7 V
6 k
22
50 k 500 2.25 V
23
12 V (pin 28) 80
B signal output pin: * Be sure to connect a capacitor to output pin. If the pin is not used with a 75 terminating resistor, do not allow a 20 mA or more output current flow.
(typ.) DC 6.2 V
75
Pins 23,27,29 220 F 0.01 F 75 1%
80 7.8 mA
11
AN5870K
s Terminal Equivalent Circuits (continued)
Pin No. 24 25
80
ICs for TV
Equivalent circuit
5 V (pin 4)
Description GND pin for 12 V Sync. on green signal Output pin: * If terminating with a resistor, do not allow 10 mA or more output current flow.
Input resistance or pin voltage GND (typ.) DC 2.3 V
70
25
80 2.1 mA
26 27
Refer to pin 23
* For RGB signal circuit For G sync. output G signal output pin: * Be sure to connect a capacitor to output pin. If the pin is not used with a 75 terminating resistor, do not allow a 20 mA or more output current flow.
GND Refer to pin 23
28 29
Refer to pin 23
Power supply pin for 12 V: * For RGB signal circuit R signal output pin: * Be sure to connect a capacitor to output pin. If the pin is not used with a 75 terminating resistor, do not allow a 20 mA or more output current to flow.
12 V Refer to pin 23
30
Power supply pin for 12 V: * For RGB signal circuit
12 V
12
ICs for TV
s Technical Information
* Operational explanation 1. SW block Switches over R, G, B, H, V signal of 2 systems. SW pin (pin 22) In low-level In high-level Selected pins
AN5870K
R in 1 (pin 1), G in 1 (pin 5), B in 1 (pin 9), H in 1 (pin 13), V in 1 (pin 15) R in 2 (Pin 3), G in 2 (pin 7), B in 2 (pin 11), H in 2 (pin 14), V in 2 (pin 16)
2. High-level signal detection block Sync.-in pin (pin 21) is a pin for inputting the sync.-on green signal and it is separated into the composite sync. signal (composite sync.) inside. H-in 1 and 2 pins (pin 13 or pin 14) are input pins for the video signal and the separated horizontal signal. The high-level signal detection block discriminates the presence of H-in signal which is selected in SW block and provides the output to H-out pin (pin 19) in the following manner. Input signal Sync.-in pin (pin 21) q q q H-in pin (pin 13 * pin 14) q Output signal H-out pin (pin 19) H-in signal Sync.in signal H-in signal DC (state of sync.-in pin) H signal detection pin (pin 20) voltage becomes under 1 V or over 4 V if H. sync. signal is not inputted. The output signal for the H. sync. signal detection pin voltage becomes as follows and it has hysteresis characteristics. It is possible to adjust the H. sync. signal detection time by means of an external capacitor.
0V 1V
Sync-in signal selection (Detection voltage change) When detecting H. sync. signal (Sync.-in signal is selected when lowed under 1 V)
When rising from 0 V
2V
H. sync. signal detection pin voltage (H-in signal is selected if 2 V is exceeded) (Detection voltage change)
1V
2.5V
H-in signal selection
4V
H. sync. signal detection pin voltage
(Sync.-in signal is selected when 4 V is exceeded) (Detection voltage change)
(Detection voltage change) When decreasing from 5 V (H-in signal is selected when lowed under 3 V)
3V
Sync.-in signal selection
5V
H. sync. signal detection pin voltage
13
AN5870K
s Usage Notes
ICs for TV
1. About C22 0.01 F capacitor (refer to s Application Circuit Example) In the case of evaluation board for this IC without heat sink, a resonance phenomena takes place at approx. 400 MHz between pin 23 B-out pin and pin 22 SW pin and affects the frequency characteristic of B-out pin. To solve the above problem, the correction can be made by attaching C22 0.01 F capacitor between pin 22 SW pin and GND at a place as close to the IC as possible. In the case of using this IC, study if the correction is necessary. 2. About latch-up In our latch-up testing, a voltage charged to 200 pF capacitor is applied to the IC pin, in the state of providing only a voltage to the power supply pin of the IC, and we confirm that the latch-up does not occur up to 200 V. It is confirmed that this IC does not cause latch-up up to 200 V under a condition including the peripheral components. (Refer to s Application Circuit Example). Be careful to pin 20, pin 21, pin 28 and pin 30 which are especially weak. In the case of using this IC, the peripheral components to be attached externally should be placed as close to the IC as possible.
s Application Circuit Example
VCC1 (5 V) VCC1 1 F 1 75 1% 1 F R-in2 75 1% 1 F G-in1 75 1% 1 F G-in2 75 1% 1 F B-in1 75 1% 1 F B-in2 75 1% 10 H-in1 10 H-in2 V-in1 10 VCC1 9 10 VCC1 11 12 13 14 15
Hsync detect sw Sw select bias Sync. sep
VCC2 (12 V) 30 VCC2 29
6 dB
R-in1
220 F 0.01 F 220 F 0.01 F G sync. 75 1% R-out
2 VCC1 3 4 VCC1 5 6 VCC1 7 8
6 dB 6 dB
28 VCC2 27 26 25 24 23 22 C22 21 20 VCC2
75 1%
G-out
200 220 F 0.01 F 0.15 F 75 1% B-out SW
Sync. in 0.1 F 19 18 17 16 10 V-in2 H-out V-out
14

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