Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches SOIC 20 W

_______________General Description

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

Video Signal Routing

High-Speed Data Acquisition

Test Equipment

ATE Equipment

Networking

____________________________Features

♦ Low 50Ω Insertion Loss: -1dB at 100MHz

♦ High 50Ω Off Isolation: -80dB at 10MHz

♦ Low 50Ω Crosstalk: -80dB at 10MHz

♦ DC to 300MHz -3dB Signal Bandwidth

♦ 20Ω Signal Paths with ±5V Supplies

♦ 1Ω Signal-Path Matching with ±5V Supplies

♦ 0.5Ω Signal-Path Flatness with ±5V Supplies

♦ ±2.7V to ±6V Dual Supplies

+2.7V to +12V Single Supply

♦ Low Power Consumption: <1µW

♦ Rail-to-Rail Bidirectional Signal Handling

♦ Pin Compatible with Industry-Standard DG540,

DG542, DG643

♦ >2kV ESD Protection per Method 3015.7

♦ TTL/CMOS-Compatible Inputs

with Single +5V or ±5V

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

________________________________________________________________

Maxim Integrated Products

TOP VIEW

MAX4546

DIP/SO/QSOP

IN2

COM2

GND2

NO2

V+

NC3

GND3

COM3

N01

GND1

COM1

IN1

COM4

GND4

NC4

V-

IN2

COM2

GND2

NO2N01

GND1

COM1

IN1

V+

GND6

N03

GND3GND4

N04

GND5

V-

COM3

IN3IN4

COM4

MAX4545

DIP/SO/SSOP

MAX4547

DIP/SO/QSOP

N02

V+

GND2

COM2

GND3

V-

NC2

IN2

GND1

V-

N01

IN1

NC1

V+

GND4

COM1

MAX4545

SWITCHES SHOWN

FOR LOGIC “0” INPUT

LOGIC SWITCH

OFF

MAX4547

LOGIC NO-COM

OFF

NC-COM

OFF

MAX4546

LOGIC 1, 2

OFF

3, 4

OFF

_____________________Pin Configurations/Functional Diagrams/Truth Tables

19-1232; Rev 0; 6/97

______________Ordering Information

Ordering Information continued at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.

PART

MAX4545CPP

MAX4545CWP 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 Plastic DIP

20 Wide SO

Summary of content (16 pages)

PAGE 1
9-1232; Rev 0; 6/97 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches ____________________________Features ________________________Applications ♦ Low 50Ω Insertion Loss: -1dB at 100MHz ♦ High 50Ω Off Isolation: -80dB at 10MHz ♦ Low 50Ω Crosstalk: -80dB at 10MHz ♦ DC to 300MHz -3dB Signal Bandwidth ♦ 20Ω Signal Paths with ±5V Supplies ♦ 1Ω Signal-Path Matching with ±5V Supplies ♦ 0.5Ω Signal-Path Flatness with ±5V Supplies ♦ ±2.7V to ±6V Dual Supplies +2.
PAGE 2
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) V+ ...........................................................................-0.3V, +13.0V V- ............................................................................-13.0V, +0.3V V+ to V-...................................................................-0.3V, +13.0V All Other Pins (Note 1) ..........................(V- - 0.3V) to (V+ + 0.
PAGE 3
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches (V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, VINL = 0.8V, VINH = 2.4V, VGND_ = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches ELECTRICAL CHARACTERISTICS—Single +5V Supply (V+ = +4.5V to +5.5V, 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 VCOM_, VNO_, VNC_ (Note 3) +25°C 0 26 V+ V 40 Ω Signal-Path On-Resistance RON V+ = 4.5V, VCOM_ = 3.
PAGE 5
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches (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 VCOM_, VNO_, VNC_ (Note 3) +25°C RON V+ = 2.7V, VCOM_ = 1V, ICOM_ = 1mA +25°C IN_ Input Logic Threshold High VIN_H (Note 3) C, E IN_ Input Logic Threshold Low VIN_L (Note 3) C, E 0.
PAGE 6
__________________________________________Typical Operating Characteristics (V+ = +5V, V- = -5V, TA = +25°C, GND = 0V, packages are surface mount, unless otherwise noted.) ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) V+, V- = 1.2V, -1.2V 25 MAX4545 TOC02 1000 MAX4545 TOC01 100 V- = 0V 23 TA = +125°C 21 V+ = 2.7V 100 V+ = 3.3V 2 3 4 0 5 1 2 3 4 5 6 7 8 9 VCOM (V) ON-RESISTANCE vs.
PAGE 7
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches 1.2 LOSS (dB) 1.0 0.8 0.6 INSERTION LOSS -50 -60 -70 0.2 OFF ISOLATION -40 -50 OFF ISOLATION -60 -80 CROSSTALK -90 -100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.1 1 V+ (V) 10 100 1 1000 10 100 100 80 V+ = +5V V- = -5V 5Vp-p SIGNAL 600Ω SOURCE AND LOAD 40 -30 20 ON PHASE 0 -50 -20 -60 -40 -70 OFF ISOLATION -80 -60 -100 -100 1 10 100 FREQUENCY (MHz) 1 0.1 0.01 0.
PAGE 8
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches ______________________________________________________________Pin Description PIN NAME FUNCTION* MAX4545 MAX4546 MAX4547 1, 10, 11, 20 1, 16 1, 9 IN_ 3, 6, 8, 13, 15, 18 3, 7, 10, 14 4, 6, 12, 14 GND_ 16 12 7, 15 V+ Positive Supply-Voltage Input (analog and digital) 5 5 3, 11 V- Negative Supply-Voltage Input. Connect to ground plane for single-supply operation.
PAGE 9
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches The MAX4545/MAX4546/MAX4547 are optimized for ±5V operation. Using lower supply voltages or a single supply increases switching time, increases on-resistance (and therefore on-state attenuation), and increases nonlinearity. Switch Off Condition When the switch is off, MOSFETs N1, N2, P1, and P2 are off and MOSFET N3 is on. The signal path is through the off-capacitances of the series MOSFETs, but it is shunted to ground by N3.
PAGE 10
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches Single-supply operation also limits signal levels and interferes with grounded signals. When V- = 0V, AC signals are limited to -0.3V. Voltages below -0.3V can be clipped by the internal ESD-protection diodes, and the parts can be damaged if excessive current flows. Power Off When power to the MAX4545/MAX4546/MAX4547 is off (i.e., V+ = 0V and V- = 0V), the Absolute Maximum Ratings still apply.
PAGE 11
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches 82Ω (194Ω) 10nF 12 V+ LOGIC IN 1 IN1 IN2 16 2 COM1 50Ω IN/OUT 3 COM2 15 GND1 GND2 MAX4546 4 NO1 6 NC4 7 50Ω OUT/IN NO2 13 NC3 11 GND3 GND4 14 10 COM3 9 8 COM4 V38Ω (61Ω) 38Ω (61Ω) 5 10nF V- 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.
PAGE 12
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches 10nF 1 1 2 2 3 3 4 V+ GND5 OUT GND6 V+ MAX4545 COM1 MAX4545 1 4 50/75Ω OUT/IN 2 3 NO1 GND1 OUT COM2 NO2 GND2 MAX4545 COM3 4 NO3 GND3 ADDRESS DECODING COM4 NO4 GND4 5 6 7 8 TO ADDITIONAL MUXES 2 3 IN1 OUT 1 MAX4545 4 IN2 IN3 IN4 IN1 IN2 IN3 IN4 V10nF VMORE THAN 4 CHANNELS 2 TO 4 CHANNELS Figure 3.
PAGE 13
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches 10nF +5V V+ NO_OR NC_ V+ VIN_ 3V 50% 50% 0V MAX4545 MAX4546 MAX4547 VIN_ IN_ 90% VOUT COM_ V- GND_ VOUT 90% 0V RL = 50Ω 50Ω tON tOFF 10nF -5V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV). V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. REPEAT TEST FOR EACH SWITCH. Figure 4.
PAGE 14
MAX4545/MAX4546/MAX4547 Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches _________________________________Test Circuits/Timing Diagrams (continued) 10nF +5V V+ NO_ OR NC_ V+ VIN_ VNO = 0V 0V MAX4545 MAX4546 MAX4547 VIN_ IN_ COM_ GND_ V- ∆VOUT VOUT VOUT CL = 1000pF 50Ω 10nF ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. -5V Q = ∆VOUT x CL V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 6.
PAGE 15
Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches _________________Chip Topographies MAX4545 10nF +5V 0V OR V+ COM1 V+ IN_ IN1 IN2 COM2 GND2 N.C. NO_ 0.101" (2.565mm) GND1 NC_ MAX4545 MAX4546 MAX4547 GND_ NO2 1MHz CAPACITANCE ANALYZER COM_ V- V+ NO1 GND6 VGND5 NO3 NO4 10nF GND3 -5V ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (0V). N.C. GND4 COM4 Figure 8. NO_, NC_, COM_ Capacitance IN4 IN3 COM3 0.085" (2.159mm) MAX4546 COM1 IN1 IN2 MAX4547 COM2 NO1 GND2 0.
PAGE 16
___________________________________________Ordering Information (continued) PART MAX4545CAP MAX4545C/D TEMP.