|
|
PDF MAX4547 Data sheet ( Hoja de datos )
| Número de pieza | MAX4547 | |
| Descripción | Quad/Dual / Low-Voltage / Bidirectional RF/Video Switches | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX4547 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
19-1232; Rev 0; 6/97
Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches
_______________General Description ____________________________Features
The MAX4545/MAX4546/MAX4547 are low-voltage
T-switches designed for switching RF and video signals
from DC to 300MHz in 50Ω and 75Ω systems. The
MAX4545 contains four normally open single-pole/single-
throw (SPST) switches. The MAX4546 contains two dual
SPST switches (one normally open, one normally closed.)
The MAX4547 contains two single-pole/double-throw
(SPDT) switches.
Each switch is constructed in a “T” configuration, ensuring
excellent high-frequency off isolation and crosstalk of
-80dB at 10MHz. They can handle Rail-to-Rail® analog sig-
nals in either direction. On-resistance (20Ω max) is
matched between switches to 1Ω max and is flat (0.5Ω
max) over the specified signal range, using ±5V supplies.
The off leakage current is less than 5nA at +25°C and
50nA at +85°C.
These CMOS switches can operate with dual power sup-
plies ranging from ±2.7V to ±6V or a single supply
between +2.7V and +12V. All digital inputs have 0.8V/2.4V
logic thresholds, ensuring both TTL- and CMOS-logic com-
patibility when using ±5V or a single +5V supply.
________________________Applications
RF Switching
o Low 50Ω Insertion Loss: -1dB at 100MHz
o High 50Ω Off Isolation: -80dB at 10MHz
o Low 50Ω Crosstalk: -80dB at 10MHz
o DC to 300MHz -3dB Signal Bandwidth
o 20Ω Signal Paths with ±5V Supplies
o 1Ω Signal-Path Matching with ±5V Supplies
o 0.5Ω Signal-Path Flatness with ±5V Supplies
o ±2.7V to ±6V Dual Supplies
+2.7V to +12V Single Supply
o Low Power Consumption: <1µW
o Rail-to-Rail Bidirectional Signal Handling
o Pin Compatible with Industry-Standard DG540,
DG542, DG643
o >2kV ESD Protection per Method 3015.7
o TTL/CMOS-Compatible Inputs
with Single +5V or ±5V
______________Ordering Information
Video Signal Routing
PART
TEMP. RANGE PIN-PACKAGE
High-Speed Data Acquisition
Test Equipment
ATE Equipment
MAX4545CPP
0°C to +70°C
20 Plastic DIP
MAX4545CWP
0°C to +70°C
20 Wide SO
Ordering Information continued at end of data sheet.
____N_e_t_w_o_rk_in_g__________Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
IN1 1
COM1 2
GND1 3
N01 4
V- 5
GND5 6
N04 7
GND4 8
COM4 9
IN4 10
MAX4545
20 IN2
19 COM2
18 GND2
17 NO2
16 V+
15 GND6
14 N03
13 GND3
12 COM3
11 IN3
MAX4546
IN1 1
COM1 2
GND1 3
N01 4
V- 5
NC4 6
GND4 7
COM4 8
16 IN2
15 COM2
14 GND2
13 NO2
12 V+
11 NC3
10 GND3
9 COM3
MAX4547
IN1 1
N01 2
V- 3
GND1 4
COM1 5
GND4 6
V+ 7
NC1 8
16 N02
15 V+
14 GND2
13 COM2
12 GND3
11 V-
10 NC2
9 IN2
SWITCHES SHOWN
FOR LOGIC “0” INPUT
DIP/SO/SSOP
MAX4545
LOGIC
SWITCH
0 OFF
1 ON
DIP/SO/QSOP
LOGIC
MAX4546
1, 2
3, 4
0 OFF ON
1 ON OFF
DIP/SO/QSOP
MAX4547
LOGIC
NO-COM
NC-COM
0 OFF ON
1 ON OFF
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +2.7V to +3.6V, V- = 0V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are
at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
ANALOG SWITCH
Analog Signal Range
Signal-Path On-Resistance
LOGIC INPUT
IN_ Input Logic Threshold High
IN_ Input Logic Threshold Low
IN_ Input Current Logic High or
Low
VCOM_,
VNO_, VNC_
(Note 3)
RON
V+ = 2.7V, VCOM_ = 1V,
ICOM_ = 1mA
VIN_H
VIN_L
(Note 3)
(Note 3)
IINH_, IINL_ VIN_ = 0.8V or 2.4V (Note 3)
+25°C
+25°C
C, E
0
V+ V
70 120
Ω
150
C, E 1.0 2.4 V
C, E 0.8 1.0
V
C, E -1
1 µA
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time
tON
Turn-Off Time
tOFF
VCOM_ = 1.5V, V+ = 2.7V,
Figure 4 (Note 3)
VCOM_ = 1.5V, V+ = 2.7V,
Figure 4 (Note 3)
+25°C
C, E
+25°C
C, E
300 600
ns
800
50 150
ns
200
Break-Before-Make Time Delay
(MAX4546/MAX4547 only)
tBBM
VCOM_ = 1.5V, V+ = 2.7V,
Figure 5 (Note 3)
+25°C 15 100
ns
POWER SUPPLY
V+ Supply Current
V+ Supply Current
+25°C
-1 0.05
1
I+ V+ = 3.6V, all VIN_ = 0V or V+
C, E -10
µA
10
Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: Guaranteed by design.
Note 4: ∆RON = ∆RON(MAX) - ∆RON(MIN).
Note 5: Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as mea-
sured over the specified analog signal range.
Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 7: Off isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch.
Note 8: Between any two switches.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
_______________________________________________________________________________________ 5
5 Page 
Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches
LOGIC
IN
50Ω
IN/OUT
V+
10nF
1 IN1
12
V+
IN2 16
82Ω
(194Ω)
2 COM1
3 GND1
4 NO1
6 NC4
MAX4546
COM2 15
14
GND2
NO2 13
NC3 11
50Ω
OUT/IN
38Ω
(61Ω)
7 GND4
8 COM4
V-
10nF 5
GND3 10
COM3 9
38Ω
(61Ω)
V-
LOGIC
0
1
SWITCH
OFF
ON
SWITCHES SHOWN FOR LOGIC “0” INPUT
( ) ARE FOR 75 SYSTEMS.
Figure 2. Impedance Matching On/Off Switch
On the MAX4545, GND5 and GND6 should always be
connected to the ground plane with solid copper to
improve isolation and crosstalk.
Signal Routing
Keep all signal leads as short as possible. Separate all
signal leads from each other and other traces with the
ground plane on both sides of the board. Where possi-
ble, use coaxial cable instead of printed circuit board
traces.
Board Layout
IC sockets degrade high-frequency performance and
should not be used if signal bandwidth exceeds 5MHz.
Surface-mount parts, having shorter internal lead
frames, provide the best high-frequency performance.
Keep all bypass capacitors close to the device, and
separate all signal leads with ground planes. Such
grounds tend to be wedge-shaped as they get closer to
the device. Use vias to connect the ground planes on
each side of the board, and place the vias in the apex of
the wedge-shaped grounds that separate signal leads.
Logic-level signal lead placement is not critical.
Impedance Matching
The typical on-resistances of the switches in the
MAX4545/MAX4546/MAX4547 are 14Ω, but the off-
state impedances are approximately equal to a 6pF
capacitor. In coaxial systems, therefore, it is impossible
to match any impedance for both the on and off state. If
impedance matching is critical, the MAX4546 is best
suited, since its two sections can be configured as a
single on/off switch, as shown in Figure 2. This circuit
“wastes” switches and has higher losses, but has bet-
ter off isolation and maintains good impedance match-
ing in both the on and off states. The resistance values
shown in Figure 3 are optimized with ±5V supplies for
both 50Ω and 75Ω systems at room temperature.
Multiplexer
With its excellent off isolation, the MAX4545 is ideal for
use in high-frequency video multiplexers. Figure 3
shows such an application for switching any one of four
video inputs to a single output. The same circuit may
be used as a demultiplexer by simply reversing the sig-
nal direction.
Stray capacitance of traces and the output capacitance
of switches placed in parallel reduces bandwidth, so the
outputs of no more than four individual switches should
be placed in parallel if high bandwidth is to be main-
tained. If more than four mux channels are needed, the
4-channel circuit should be duplicated and cascaded.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX4547.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX454 | CMOS Video Multiplexer/Amplifier | Maxim Integrated |
| MAX4540 | Low-Voltage / Single 8-to-1 and Dual 4-to-1 Cal-Multiplexers | Maxim Integrated |
| MAX4541 | Low-Voltage / Single-Supply Dual SPST/SPDT Analog Switches | Maxim Integrated |
| MAX4542 | Single-Supply Dual SPST/SPDT Analog Switches | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |