Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches SSOP 36

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General Description

The MAX4548/MAX4549 serial-interface, programmable,

triple 3x2 audio/video crosspoint switches are ideal for

multimedia applications. The devices include three

crosspoint switch matrices, each containing three inputs

and two outputs. To improve off-isolation, each switch

matrix has a shunt input and each output is selectively

programmable for clickless or regular-mode operation. A

selectable set of internal resistive voltage dividers sup-

plies DC bias for each output when using AC-coupled

inputs. To improve crosstalk, the voltage dividers include

four externally accessible bypass points.

The MAX4548/MAX4549 feature 35Ω max on-resis-

tance, 7Ω on-resistance matching between channels,

5Ω on-resistance flatness, and 0.07% total harmonic

distortion (THD). Additionally, they feature off-isolation

of -85dB at 20kHz and -72dB at 10MHz, with crosstalk

of -85dB at 20kHz and -55dB at 10MHz. The MAX4548

uses a 2-wire I

C™-compatible serial interface, while

the MAX4549 uses a 3-wire SPI™/QSPI™/MICROWIRE™-

compatible serial interface. These parts are available in

36-pin SSOP packages and are specified for the

extended (-40°C to +85°C) operating range.

Applications

Set-Top Boxes

PC Multimedia Boards

Video Conferencing Systems

High-End Audio Systems

Security Systems

Features

♦ Selectable Soft-Switching Mode for “Clickless”

Audio Operation

♦ 22Ω Typical On-Resistance (+5V Supply)

♦ 5Ω Typical On-Resistance Matching Between

Channels

♦ 2Ω Typical On-Resistance Flatness

♦ Audio Performance

-85dB Off-Isolation at 20kHz

-85dB Crosstalk at 20kHz

0.07% THD with 600Ω Load

♦ Video Performance

-72dB Off-Isolation at 10MHz

-55dB Crosstalk at 10MHz

♦ Serial Interface

2-Wire I

C-Compatible (MAX4548)

3-Wire SPI/QSPI/MICROWIRE-Compatible

(MAX4549)

♦ Single-Supply Operation from +2.7V to +5.5V

MAX4548/MAX4549

Serially Controlled, Triple 3x2 Audio/Video

Crosspoint Switches

________________________________________________________________

Maxim Integrated Products

CBIASL

COM1C

MID5

COM2C

GND

COM1A

ABIASH

MID1

COM1B

MID2

COM2A

MID3

COM2B

MID4

N03B

N03A

N02B

NO2A

N01B

NO1A

V+

NO3C

NO2C

CBIASH

NO1C

SSOP

TOP VIEW

MAX4548

MAX4549

18 A1 (DOUT)

( ) ARE FOR MAX4549

ABIASL

V+

A0 (CS)

SCL (SCLK)

SDA (DIN)

GND

19-1496; Rev 0; 6/99

PART

MAX4548EAX

MAX4549EAX

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

36 SSOP

Pin Configuration

Ordering Information

Functional Diagram appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

C is a trademark of Philips Corp.

Summary of content (20 pages)

PAGE 1
9-1496; Rev 0; 6/99 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Features ♦ Selectable Soft-Switching Mode for “Clickless” Audio Operation ♦ 22Ω Typical On-Resistance (+5V Supply) ♦ 5Ω Typical On-Resistance Matching Between Channels ♦ 2Ω Typical On-Resistance Flatness ♦ Audio Performance -85dB Off-Isolation at 20kHz -85dB Crosstalk at 20kHz 0.
PAGE 2
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches ABSOLUTE MAXIMUM RATINGS V+ to GND ................................................................-0.3V to +6V NO_ _, S_, MID_, BYP, COM_ _, CBIASL, ABIASL, CBIASH, ABIASH, DOUT to GND (Note 1)......................................................-0.3V to (V+ + 0.3V) CS, A0, A1, SDA, SCL, DIN, SCLK to GND ........................................................-0.3V to +6V Continuous Current into Any Terminal..................
PAGE 3
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches (V+ = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VIDEO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk VISO(V) VCT(V) -3dB Bandwidth BW Off-Capacitance COFF(NO) VNO_ _ or VS_ = 1VRMS, fIN = 10MHz, RL = 50Ω, RS =50Ω, S_ = GND Shunt switch on -72 Shunt switch off -62 dB VNO_ _ or VS_ = 0.
PAGE 4
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued) (V+ = +3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS VNO_ _ or VS_ = 3V, 0.5V; VCOM_ _ = 0.5V, 3V; V+ = 3.6V MIN TYP MAX TA = +25°C -2 0.
PAGE 5
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches (V+ = +2.7V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A0, A1) V+ = 5V Input Low Voltage VIL V+ = 3V Input High Voltage VIH Input Hysteresis VHYST Input Leakage Current ILEAK Input Capacitance MAX 0.8 0.
PAGE 6
3-WIRE TIMING CHARACTERISTICS (Figure 5) (V+ = +2.7V to +5.25V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN DIN to SCLK Setup tDS 0 0 100 DIN to SCLK Hold tDH 0 SCLK Fall to Output Data Valid tDO CS to SCLK Rise Setup tCSS Operating Frequency V+ = 4.75V to 5.25V V+ = 2.7V to 5.25V fOP TYP MAX UNITS 10 2.
PAGE 7
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches 2 MAX4548 toc06 V+ = 5V 6.2 1 MAX4548 toc05 6.4 600Ω IN AND OUT SIGNAL = 1VRMS V+ = 3.3V Q (pC) 5.8 THD+N (%) 1 6.0 0 5.6 0.1 -1 5.4 5.2 -2 5.0 -3 -40 -20 0 20 40 60 0 80 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.
PAGE 8
Typical Operating Characteristics (continued) (V+ = +5V, TA = +25°C, unless otherwise noted.) ON/OFF TIME vs.
PAGE 9
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches PIN NAME FUNCTION MAX4548 MAX4549 1 1 NO1C 2 2 CBIASH 3 3 NO2C 4 4 SC 5 5 NO3C 6, 21 6, 21 V+ 7 7 NO1A Input 1 to Crosspoint A 8 8 NO1B Input 1 to Crosspoint B 9 9 SA 10 10 NO2A Input 2 to Crosspoint A 11 11 NO2B Input 2 to Crosspoint B 12 12 SB 13 13 NO3A Input 3 to Crosspoint A 14 14 NO3B Input 3 to Crosspoint B 15, 16, 32 15, 16, 32 GND Ground 17 – SDA 2-Wire Serial-Interface Data I
PAGE 10
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Pin Description (continued) PIN NAME FUNCTION MAX4548 MAX4549 26 26 MID3 27 27 COM2A 28 28 MID2 29 29 COM1B 30 30 MID1 31 31 COM1A Output 1 of Crosspoint A 33 33 COM2C Output 2 of Crosspoint C 34 34 MID5 35 35 COM1C Output 1 of Crosspoint C 36 36 CBIASL High Side of Bias Network for Crosspoint C.
PAGE 11
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches RS SIGNAL GENERATOR NO1_ 2/3 VOUT RL 10k COM1_ ANALYZER COM2_ ANALYZER 10k RL DECODER/ ENCODER V+/2 V+ S_ GND 10nF 1µF 10k VIN Figure 2a. Off-Isolation RS VIN RS 10k SIGNAL GENERATOR 10k VOUT 10k SIGNAL GENERATOR MAX4548 MAX4549 Figure 2c. All-Hostile Crosstalk Detailed Description 10k Figure 2b.
PAGE 12
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Table 2. COM Data-Byte Format (C0, C1, C2, C3, C4, C5 = “1”) Table 1. Command-Byte Format BIT REGISTER C7 Clickless Mode C6 Bias C5 COM2C C4 COM1C D7 Don’t care — C3 COM2B D6 Don’t care — C2 COM1B D5 Don’t care — C1 COM2A D4 Don’t care — C0 COM1A D3 Controls the switch connected to S_; 1 = close switch, 0 = open switch.
PAGE 13
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches The devices are programmed with a command byte and a data byte or data word (2 bytes). Each bit of the command byte selects one of the functional blocks to be controlled by the subsequent data byte (word). The data byte (word) sets the state of the selected block(s). For the three switch-matrix blocks, the data byte sets the switch state.
PAGE 14
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Table 4. Clickless Mode Format (C7 = “1”) BIT POWER-UP DEFAULT STATE DESCRIPTION D7 Don’t care — D6 Don’t care — D5 Controls COM2C clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. 1 D4 Controls COM1C clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. 1 D3 Controls COM2B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.
PAGE 15
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches MAX4548/MAX4549 CS SCLK 1 DIN 24 C7 D0 C0 D15 COMMAND BYTE DATA BYTE Figure 6. 3-Wire Serial-Interface Communication ••• CS tCSH tCSS tCL tCH SCLK tCSH ••• tDS tDH ••• DIN tDV tDO tTR ••• DOUT Figure 7. 3-Wire Serial-Interface Timing Details the same configuration. Any block that is not selected in the command byte remains unchanged. 2-Wire Serial Interface The MAX4548 uses a 2-wire I2C-compatible serial interface.
PAGE 16
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Slave Address (Address Byte) The MAX4548 uses an 8-bit slave address. To select a slave address, connect A0 and A1 to V+ or GND. The MAX4548 has four possible slave addresses, thus a maximum of four of these devices may share the same 2-bit address bus. The slave devices on the MAX4548 monitor the serial bus continuously, waiting for a start condition followed by an address byte.
PAGE 17
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches 31 COM1A 27 COM2A 29 COM1B 25 COM2B 35 COM1C 33 COM2C 19 A1 (DOUT) 20 A0 (CS) 18 SCL (SCLK) 17 SDA (DIN) 23 22 ABIASL 2 36 CBIASL NO1A 7 NO2A 10 NO3A 13 SA 9 MAX4548 MAX4549 SWITCH MATRIX A NO1B 8 NO2B 11 NO3B 14 SB 12 SWITCH MATRIX B NO1C 1 NO2C 3 NO3C 5 SC 4 SWITCH MATRIX C V+ GND ABIASH CBIASH CONTROL LOGIC 6, 21 15, 16, 32 BIAS RESISTOR NETWORK MID1 MID2 MID3 30 34 28 26 24 MID5 M
PAGE 18
________________________________________________________Package Information SSOP.EPS MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches Chip Information TRANSISTOR COUNT: 7700 SUBSTRATE IS INTERNALLY CONNECTED TO V+.
PAGE 19
Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches MAX4548/MAX4549 NOTES ______________________________________________________________________________________ 19
PAGE 20
MAX4548/MAX4549 Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches NOTES Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.