MAXIM MAX4550, MAX4570 Technical data

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General Description

The MAX4550/MAX4570 serial-interface, programma­ble, dual 4x2 audio/video crosspoint switches are ideal
for multimedia applications. Each device contains two
identical crosspoint switch arrays, each with four inputs
and two outputs. To improve off-isolation, use the addi­tional crosspoint inputs SA and SB as shunts. Each out­put is selectively programmable for clickless or regular
mode operation. A set of internal resistive voltage­dividers supplies DC bias for each output when using
AC-coupled inputs. Additionally, four auxiliary outputs
control additional circuitry via the MAX4550/MAX4570’s
2-wire or 3-wire interface.

The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω
on-resistance matching between channels, 5Ω on­resistance flatness, and 0.014% total harmonic distor­tion. Additionally, they feature off-isolation of at least

-110dB in the audio frequency range and -78dB at
4MHz, with -95dB crosstalk in the audio frequency
range and -54dB at 4MHz. The MAX4550 uses a 2-wire
I2C-compatible serial interface, while the MAX4570
uses a 3-wire SPI™/QSPI™ or MICROWIRE™-compati­ble serial interface. These parts are available in 28-pin
SSOP and wide SO packages and are tested over
either the commercial (0°C to +70°C) or extended
(-40°C to +85°C) operating temperature range.

Applications

Set-Top Boxes
PC Multimedia Boards
High-End Audio Systems
Video Conferencing Systems

Features

♦ Selectable Soft Switching Mode for Clickless

Audio Operation

♦ 43Ω Typical On-Resistance (±5V Supplies)
♦ 5Ω Typical On-Resistance Matching Between

Channels

♦ 4Ω Typical On-Resistance Flatness
♦ 0.014% Total Harmonic Distortion with 1kΩ Load
♦ -110dB Off-Isolation at 20kHz

-78dB Off-Isolation at 4MHz

♦ -95dB Crosstalk at 20kHz

-54dB Crosstalk at 4MHz

♦ Serial Interface

2-Wire, Fast-Mode, I

2

C-Compatible (MAX4550)
3-Wire, SPI/QSPI/MICROWIRE-Compatible
(MAX4570)

♦ Four Auxiliary Outputs that Extend µP Ports
♦ Single-Supply Operation: +2.7V to +5.5V

Dual-Supply Operation: ±2.7V to ±5.5V

MAX4550/MAX4570

Serially Controlled, Dual 4x2, Clickless

Audio/Video Analog Crosspoint Switches

________________________________________________________________

Maxim Integrated Products

1

28
27
26
25
24
23
22
21
20
19
18
17
16
15

1
2
3
4
5
6
7
8

9
10
11
12
13
14

SA
NO2B
NO2A
V­V+
NO1B

SDA (DIN)

NO1A
GND
COM1A
Q3
COM1B
Q2
A1 (DOUT)

SCL (SCLK)

A0 (CS)

Q1

COM2B

( ) ARE FOR MAX4570.

Q0

COM2A

V+

NO4B

NO4A

BIASL

BIASH

NO3B

NO3A

SB

SO/SSOP

TOP VIEW

MAX4550
MAX4570

19-1397; Rev 0; 10/98

PART

MAX4550CAI

MAX4550CWI
MAX4550EAI -40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP
28 Wide SO
28 SSOP

EVALUATION KIT

AVAILABLE

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information

MAX4550EWI -40°C to +85°C 28 Wide SO
MAX4570CAI
MAX4570CWI
MAX4570EAI -40°C to +85°C

0°C to +70°C

0°C to +70°C 28 SSOP

28 Wide SO
28 SSOP

MAX4570EWI -40°C to +85°C 28 Wide SO

I2C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

Channel-to-Channel Crosstalk V

CTA(A)

ICOM_ _ = 1mA

MAX4550/MAX4570

Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies

(V+ = +5V ±5%, V- = -5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Signals on NO_ _, S_, or COM_ _ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maxi-

mum current rating.

V+ to GND............................................................... -0.3V to +6V

V+ to V-................................................................-0.3V to +13.2V

V- to GND.................................................................+0.3V to -6V

NO_ _ , S_, BIAS_, COM_ _, Q_, A1, DOUT to GND

(Note 1)...............................................(V- - 0.3V) to (V+ + 0.3V)

CS, SCLK, DIN, SCL, SDA, A0 to GND....................-0.3V to +6V

Continuous Current into Any Terminal..............................±10mA

Peak Current, NO_ _ , S_ , COM_ _

(pulsed at 1ms, 10% duty cycle max) ..........................±40mA

Continuous Power Dissipation (T

A

= +70°C)

28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW

28-Pin Wide SO (derate 12.5mW/°C above +70°C) ...1000mW

Operating Temperature Ranges

MAX4550C_I/MAX4570C_I ...............................-0°C to +70°C

MAX4550E_I/MAX4570E_I ..............................-40°C to +85°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

I

COM_ _

= 4mA,

V

NO_ _

or VS_= ±3.0V,

V+ = 4.75V, V- = -4.75V

CONDITIONS

Ω

43 80

R

ON

On-Resistance

VV- V+

V

NO_ _

,

V

COM_ _

,

V

S_

Analog Signal Range (Note 3)

UNITSMIN TYP MAXSYMBOLPARAMETER

-110

TA= +25°C
TA= T

MIN

to T

MAX

100

I

COM_ _

= 4mA,

V

NO_ _

or VS_= ±3.0V,

V+ = 4.75V, V- = -4.75V

Ω

5 10

∆R

ON

COM_ _ to NO_ _ or S_
On-Resistance Match Between
Channels (Note 4)

TA= +25°C
TA= T

MIN

to T

MAX

10

I

COM_ _

= 4mA;

V

NO_ _

or VS_= ±3.0V, 0;

V+ = 4.75V; V- = -4.75V

Ω

4 5

∆R

FLAT(ON)

COM_ _ to NO_ _ or S_
On-Resistance Flatness
(Note 5)

TA= +25°C
TA= T

MIN

to T

MAX

8

V

NO_ _

or VS_= ±4.5V,

V

COM_

=

–

+

4.5V,

V+ = 5.25V, V- = -5.25V

nA

-1 0.01 1

NO

_(OFF)

NO_ _ or S_ Off-Leakage
Current (Note 6)

TA= +25°C
TA= T

MIN

to T

MAX

-10 10

V

NO_ _

or VS_= ±4.5V,

V

COM_

=

–

+

4.5V,

V+ = 5.25V, V- = -5.25V

nA

-5 0.01 5

I

COM

_(OFF)

COM_ _ Off-Leakage Current
(Note 6)

TA= +25°C
TA= T

MIN

to T

MAX

-10 10

V

NO_ _

or VS_= floating,

V

COM_

= ±4.5V,

V+ = 5.25V, V- = -5.25V

nA

-5 0.01 5

I

COM

_(ON)

COM_ _ On-Leakage Current
(Note 6)

TA= +25°C
TA= T

MIN

to T

MAX

-20 20

V

NO_ _

or VS_= 1V

RMS

, fIN= 20kHz,

RL= 10kΩ, three channels driven at 20kHz

dB-95V

CTA(A)

Channel-to-Channel Crosstalk

VNO= 1V

RMS

, fIN= 20kHz,

RL= 10kΩ, S = GND

dB

-80

V

ISO(A)

Off-Isolation (Note 7)

fIN= 1kHz, RL= 1kΩ, V

NO_

or VS_= 1V

RMS

,

V

NO_

or VS_= 0

%0.014THD+N

Total Harmonic Distortion plus
Noise

Shunt switch on
Shunt switch off

ANALOG SWITCHES

AUDIO PERFORMANCE

MAX4550/MAX4570

Serially Controlled, Dual 4x2, Clickless

Audio/Video Analog Crosspoint Switches

_______________________________________________________________________________________ 3

ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(V+ = +5V ±5%, V- = -5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

fIN= 1MHz,

CONDITIONS

pF11C

OFF(NO)

Off-Capacitance

-78

UNITSMIN TYP MAXSYMBOLPARAMETER

Shunt switch on
Shunt switch off

V

NO_ _

or VS_= 1

VRMS

,
fIN= 4MHz, RL= 1kΩ,
S_ = GND

dB

-63

V

ISO(V)

Off-Isolation

RS= 75Ω, RL= 1kΩ MHz14BW0.1dB Bandwidth

V

NO_ _

or V

S_

= 1.5V, RL= 300Ω

V

NO_ _

or V

S_

= 1.5V, RL= 5kΩ

ns200 500t

OFFSD

Turn-Off Time (Note 9)

ns400 900t

ONSD

Turn-On Time (Note 9)

V

NO_ _

or V

S_

= 1.5V ns10 100t

BBM

Break-Before-Make Time

V

NO_ _

or V

S_

= 1.5V, RL= 300Ω

V

NO_ _

or V

S_

= 1.5V, RL= 5kΩ

ms11t

OFFSE

Turn-Off Time

ms36t

ONSE

Turn-On Time

BIASH to BIASL kΩ13 20 27R

BIAS

Bias Network Resistance

Reset condition, V+ = 2.7V to 5.25V µA7 20I+V+ Supply Current (Note 10)

V+

Reset condition, V- = -5.25V to 0 µA-20I-V- Supply Current

V

NO_ _

or VS_= 1

VRMS

, fIN= 4MHz,
R

L

= 10Ω, three channels driven at 4MHz

dB-54V

CT(V)

Channel-to-Channel Crosstalk

V

2.7 5.25

V-

Supply Voltage Range

-5.25 0

ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply

(V+ = +5V ±5%, V- = 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

I

COM_ _

= 4mA,

V

NO_ _

or VS_= 3.0V,

V+ = 4.75V

I

COM_ _

= 4mA,

V

NO_ _

or VS_= 3.0V,

V+ = 4.75V

Ω

5 10

∆R

ON

On-Resistance Match Between
Channels (Note 4)

CONDITIONS

V

NO

or VS_= 4.5V, 1V;

V

COM_ _

= 1V, 4.5V;

V+ = 5.25V

nA

-1 0.01 1

I

NO_ _(OFF)

NO_ _ or S_ Off-Leakage
Current (Notes 6, 11)

TA= +25°C
TA= T

MIN

to T

MAX

-10 10

I

COM_ _

= 4mA;

V

NO_ _

or VS_= 1V, 2V,

3V; V+ = 4.75V

Ω

4 10

Ω

60 100

R

ON

On-Resistance

V0 V+

V

NO_ _

,

V

COM_ _

,

V

S_

Analog Signal Range (Note 3)

R

FLAT

On-Resistance Flatness
(Note 5)

TA= +25°C
TA= T

MIN

to T

MAX

15

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= +25°C

TA= +25°C
TA= T

MIN

to T

MAX

130

TA= T

MIN

to T

MAX

10

VIDEO PERFORMANCE

DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)

DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)

BIAS NETWORKS

POWER SUPPLIES

ANALOG SWITCHES

MAX4550/MAX4570

Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches

4 _______________________________________________________________________________________

ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)

(V+ = +5V ±5%, V- = 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

V

NO_ _

or VS_= floating;

V

COM_ _

= 1V, 4.5V;

V+ = 5.25V

nA

Shunt switch on

-5 0.01 5

I

COM_ _(ON)

COM_ _ On-Leakage Current
(Notes 6, 11)

CONDITIONS

Shunt switch off

-105

TA= +25°C
TA= T

MIN

to T

MAX

-20 20

V

NO_ _

or VS_= 1V

RMS

, fIN=

20kHz, RL= 10kΩ, S = GND
V

NO_ _

or VS_= 1V

RMS

, fIN= 20kHz,

RL= 10kΩ, three channels driven at 20kHz

dB

-80

V

ISO(A)

Off-Isolation (Note 7)

dB-97V

TC(A)

V

NO_ _

or VS_= 4.5V, 1V;

V

COM_ _

= 1V, 4.5V;

V+ = 5.25V

nA

-5 0.01 5

I

COM_ _(OFF)

COM_ _ Off-Leakage Current
(Notes 6, 11)

TA= +25°C
TA= T

MIN

to T

MAX

-10 10

Channel-to-Channel Crosstalk

fIN= 1kHz, RL= 10kΩ, V

NO_ _

or VS_= 1V

RMS

,

V

NO_ _

or VS_= 2.5V

%0.014THD+N

Total Harmonic Distortion plus
Noise

UNITSMIN TYP MAXSYMBOLPARAMETER

-74

V

NO_ _

or VS_= 1V

RMS

, fIN=

4MHz, RL= 1kΩ, S = GND

dB

-61

V

ISO(V)

Off-Isolation (Note 7)

R

SOURCE

= 75Ω, RL= 1kΩ MHz13BW0.1dB Bandwidth

fIN= 1MHz pF11C

OFF(NO)

Off-Capacitance

V

NO_ _

or V

S_

= 1.5V, RL= 5kΩ ns400 900t

ONSD

Turn-On Time (Note 9)

V

NO_ _

or V

S_

= 1.5V, RL= 300Ω ns160 500t

OFFSD

Turn-Off Time (Note 9)

V

NO_ _

or V

S_

= 1.5V ns10 100t

BBM

Break-Before-Make Time

V

NO_ _

or V

S_

= 1.5V, RL= 5kΩ ms43t

ONSE

Turn-On Time

V

NO_ _

or V

S_

= 1.5V, RL= 300Ω ms14t

OFFSE

Turn-Off Time

BIASH to BIASL kΩ13 20 27R

BIAS

Bias Network Resistance

V

NO_ _

or VS_= 1V

RMS

, fIN= 4MHz,

RL= 10kΩ, three channels driven at 4MHz

dB-52V

TC(V)

Channel-to-Channel Crosstalk

ANALOG ELECTRICAL CHARACTERISTICS—Single +3V Supply

(V+ = +3V ±10%, V- = 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

I

COM_ _

= 4mA,

V

NO_ _

or VS_= 1V,

V+ = 2.7V

CONDITIONS

Ω

106 180

R

ON

On-Resistance

V0 V+

V

NO_ _

,

V

COM_ _

,

V

S_

Analog Signal Range (Note 3)

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= +25°C
TA= T

MIN

to T

MAX

220

ANALOG SWITCHES

Shunt switch on
Shunt switch off

AUDIO PERFORMANCE

VIDEO PERFORMANCE

DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)

DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)

BIAS NETWORKS

I

SINK

= 6mA

MAX4550/MAX4570

Serially Controlled, Dual 4x2, Clickless

Audio/Video Analog Crosspoint Switches

_______________________________________________________________________________________ 5

INTERFACE I/O CHARACTERISTICS

(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

I

SOURCE

= 1mA to GND, V+ = 4.75V

CONDITIONS

4.45 4.65

UNITSMIN TYP MAXSYMBOLPARAMETER

V

2.3 2.5

V

OH

Output High Voltage

I

SOURCE

= 0.5mA to GND, V+ = 2.7V

V

0.5 1.0

V

OL

Output Low Voltage

I

SINK

= 12mA, V+ = 4.75V

0.5 1.0I

SINK

= 6mA, V+ = 2.7V

V+ > 3.6V 3.0

V+ > 3.6V 0.8

V+ < 3.6V

V

2.0

V

IH

Input High Voltage

V0.2

V+ < 3.6V

V

HYST

Input Hysteresis

V

NO_ _

= 0 or 5V µA-1 0.01 1I

LEAK

Input Leakage Current (Note 7)

0.4

I

SOURCE

= 0.5mA VV+ - 0.5 V+ - 0.1

I

SINK

= 6mA

V

OH

DOUT Output High Voltage

V

0.8

V

OL

Output Low Voltage

V

0.6

V

IL

Input Low Voltage

kHzDC 400f

SCL

SCL Clock Frequency

µs0.6t

SU:STO

STOP Condition Setup Time

ns100t

SU:DAT

Data Setup Time

µs0 0.9t

HD:DAT

Data Hold Time

µs1.3t

BUF

Bus Free Time between Stop
and Start Condition

µs1.3t

LOW

Clock Low Period

µs0.6t

HIGH

Clock High Period

MHzDC 2.1f

OP

Operating Frequency

ns0f

DH

DIN to SCLK Hold

ns100f

DS

DIN to SCLK Setup

ns20 200f

DO

SCLK Fall to Output Data Valid C

LOAD

= 50pF

ns0f

CSH

CS to SCLK Rise Hold

ns100f

CSS

CS to SCLK Rise Setup

ns

20 + 300

0.1Cb

t

R

SCL/SDA Rise Time
(Note 12)

ns

20 + 300

0.1Cb

t

F

SCL/SDA Fall Time
(Note 12)

pF5C

NO

Input Capacitance

V+ = 4.75V
V+ = 2.7V

SPI TIMING (V+ = +4.75V to +5.25V, Figures 3, 4)

I2C TIMING (V+ = +4.75V to +5.25V, Figures 1, 2)

DIGITAL OUTPUTS (DOUT, SDA)

DIGITAL INPUTS (SCK, DIN, CS, SCL, SDA)

AUXILIARY OUTPUTS