MAXIM MAX4850, MAX4850H, MAX4852, MAX4852H Technical data

General Description
The MAX4850/MAX4850H/MAX4852/MAX4852H family of dual SPDT (single-pole/double-throw) switches oper­ate from a single +2V to +5.5V supply and can handle signals greater than the supply rail. These switches fea­ture low 3.5Ω or 3.5Ω/7Ω on-resistance with low on­capacitance, making them ideal for switching audio and data signals.
The MAX4850/MAX4850H are configured with two SPDT switches and feature two comparators for head­phone detection or mute/send key functions. The MAX4852 has two SPDT switches with no comparators for low 1µA supply current.
For over-rail applications, these devices offer either the pass-through or high-impedance option. For the MAX4850/MAX4852, the signal (up to 5.5V) passes through the switch without distortion even when the posi­tive supply rail is exceeded. For the MAX4850H/ MAX4852H, the switch input becomes high impedance when the input signal exceeds the supply rail.
The MAX4850/MAX4850H/MAX4852/MAX4852H are available in the space-saving (3mm x 3mm), 16-pin TQFN package and operate over the extended temper­ature range of -40°C to +85°C.
Applications
USB Switching
Audio-Signal Routing
Cellular Phones
Notebook Computers
PDAs and Other Handheld Devices
Features
USB 2.0 Full Speed (12MB) and USB 1.1 Signal
Switching Compliant
Switch Signals Greater than V
CC
0.1ns Differential Skew
3.5Ω/7Ω On-Resistance
135MHz -3dB Bandwidth
+2V to +5.5V Supply Range
1.8V Logic Compatible
Low Supply Current
1µA (MAX4852) 5µA (MAX4850) 10µA (MAX4850H/MAX4852H)
Available in a Space-Saving (3mm x 3mm),
16-Pin TQFN Package
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
V
CC
3
MAX4850
MAX4850H
NC1
NO1
NC2
NO2
COUT2
COM1
IN1
IN2
COM2
CIN2
V
CC
3
COUT1
CIN1
MAX4852
MAX4852H
NC1
NO1
NC2
NO2
COM1
IN1
IN2
COM2
MAX4850_ MAX4852_
IN_ NO_ NC_
0 OFF ON
1 ON OFF
SWITCHES SHOWN FOR LOGIC 0 INPUT
3.5Ω
3.5Ω
7Ω
3.5Ω
3.5Ω
7Ω
Block Diagrams/Truth Table
19-3375; Rev 0; 7/04
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*EP = Exposed paddle.
Pin Configurations and Selector Guide appear at end of data sheet.
ABRIDGED DATA SHEET
PART TEMP RANGE PIN-PACKAGE
MAX4850ETE -40°C to +85°C 16 TQFN-EP* ABU
MAX4850HETE -40°C to +85°C 16 TQFN-EP* ABV
MAX4852ETE -40°C to +85°C 16 TQFN-EP* ABZ
MAX4852HETE -40°C to +85°C 16 TQFN-EP* ACA
TOP
MARK
Detailed Description
The MAX4850/MAX4850H/MAX4852/MAX4852H are low on-resistance, low-voltage, analog switches that operate from a +2V to +5.5V single supply and are fully specified for nominal 3.0V applications. These devices feature over-rail signal capability that allows signals up to 5.5V with supply voltages down to 2.0V. These devices are configured as dual SPDT switches.
These switches have low 50pF on-channel capacitance, which allows for 12Mbps switching of the data signals for USB 2.0 full speed/1.1 applications. The MAX485_ _ are designed to switch D+ and D- USB signals with a guaran­teed skew of less than 1ns (see Figure 1), as measured from 50% of the input signal to 50% of the output signal.
The MAX4850_ feature a comparator that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately 1/3 of VCC.
Applications Information
Digital Control Inputs
The logic inputs (IN_) accept up to +5.5V even if the supply voltages are below this level. For example, with a +3.3V VCCsupply, IN_ can be driven low to GND and high to +5.5V, allowing for mixing of logic levels in a system. Driving IN_ rail-to-rail minimizes power con-
sumption. For a +2V supply voltage, the logic thresholds are 0.5V (low) and 1.4V (high); for a +5V supply voltage, the logic thresholds are 0.8V (low) and 1.8V (high).
Analog Signal Levels
The on-resistance of these switches changes very little for analog input signals across the entire supply volt­age range (see Typical Operating Characteristics). The switches are bidirectional, so NO_, NC_, and COM_ can be either inputs or outputs.
Comparator
The positive terminal of the comparator is internally set to V
CC
/3. When the negative terminal (CIN_) is below the threshold (VCC/3), the comparator output (COUT_) goes high. When CIN_ rises above VCC/3, COUT_ goes low.
The comparator threshold allows for detection of head­phones since headphone audio signals are typically biased to VCC/2.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device.
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCCbefore applying analog signals, especially if the analog signal is not current-limited.
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
______________________________________________________________________________________ 11
ABRIDGED DATA SHEET
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with Over-Rail Signal Handling
12 ______________________________________________________________________________________
Test Circuits/Timing Diagrams
Figure 1. Switching Time
Figure 2. Input/Output Skew Timing Diagram
ABRIDGED DATA SHEET
MAX4850_ MAX4852_
V
NO
LOGIC INPUT
TxD+
V
CC
V
CC
NO_
IN_
GND
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
R
= V
V
OUT
NO (
RL + R
COM_
R
L
)
ON
A
R
s
tR < 20ns
V
CC
LOGIC INPUT
INPUT
0V
V
OUT
0V
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
10%
90%
V
OUT
INPUT A
INPUT A-
SWITCH OUTPUT
SWITCH
L
C
L
B
C
L
50%
0.9 x V
t
ON
V
+ 0.5V
CC
HIGH-Z MODE
t
HIZ
NORMAL MODE NORMAL MODE
t
ri
90%
50%
t
skew_i
50%
10%
t
fi
tF < 20ns
t
OFF
0.9 x V
0UT
t
OUT
HIZB
TxD-
|t
|
ro - tri
|t
|
fo - tfi
|t
|
skew_o
|t
|
skew_i
Rs = 39Ω
= 50pF
C
L
DELAY DUE TO SWITCH FOR RISING INPUT AND RISING OUTPUT SIGNALS.
DELAY DUE TO SWITCH FOR FALLING INPUT AND FALLING OUTPUT SIGNALS.
CHANGE IN SKEW THROUGH THE SWITCH FOR OUTPUT SIGNALS.
CHANGE IN SKEW THROUGH THE SWITCH FOR INPUT SIGNALS.
A-
R
s
B-
C
L
OUTPUT B
OUTPUT B-
10%
90%
t
ro
50%
t
fo
50%
90%
t
skew_o
10%
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
______________________________________________________________________________________ 13
MAX4850_
Figure 3. Break-Before-Make Interval
Figure 4. Charge Injection
Figure 5. On-Loss, Off-Isolation, and Crosstalk
ABRIDGED DATA SHEET
MAX4852_
V
V
CC
V
CC
N_
NC_
NO_
COM_
IN_
V
OUT
R
L
C
L
LOGIC
INPUT
V
CC
50%
0V
LOGIC INPUT
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
MAX4850_ MAX4852_
R
GEN
NC_
OR NO_
V
GEN
GND
0V OR V
50Ω
IN_
CC
MAX4850_ MAX4852_
NC1
GND
+5V
V
GND
0.9 x V
OUT
OFF
V
CC
V
CC
COM_
V
OUT
t
BBM
ΔV
OUT
V
OUT
V
OUT
C
L
IN
OFF
ON
IN_
Q = (ΔV
ON
OUT
OFF
)(CL)
TO V
V
IL
IH
OFF
IN
LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
10nF
NETWORK ANALYZER
CC
COM1
NO1*
V
IN
V
OUT
50Ω
MEAS REF
50Ω 50Ω
50Ω
OFF-ISOLATION = 20log
ON-LOSS = 20log
CROSSTALK = 20log
V
OUT
V
IN
V
OUT
V
IN
V
OUT
V
IN
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF", NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON", NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
*FOR CROSSTALK THIS PIN IS NO2. NC2 AND COM2 ARE OPEN.
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with Over-Rail Signal Handling
14 ______________________________________________________________________________________
Figure 6. Channel Off-/On-Capacitance
Figure 7. Comparator Switching Time
ABRIDGED DATA SHEET
V
CC
10nF
V
CC
CAPACITANCE
METER
f = 1MHz
COM_
NC_ OR NO_
MAX4850_ MAX4852_
IN
GND
V
OR V
IL
IH
MAX4850_
V
CIN_
NO_
CIN_
V
TH
V
CC
3
= VCC/3
V
CC
V
CC
GND
COUT_
V
COUT_
COMPARATOR
INPUT (V
COMPARATOR
OUTPUT (V
CIN_
COUT_
VTH + 100mV
)
V
- 100mV
TH
V
)
OUT
50%
t
COMP
50%
0V
tR < 20ns t
50%
F
< 20ns
50%
t
COMP
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
______________________________________________________________________________________ 15
Pin Configurations
Selector Guide
Chip Information
TRANSISTOR COUNT: 735
PROCESS: CMOS
Typical Operating Circuit
ABRIDGED DATA SHEET
TOP VIEW
N.C.
CIN1
CIN2
COM1
NC1
16
1
2
3
4
5678
NO1
THIN QFN THIN QFN
CONNECT EXPOSED PADDLE TO GROUND.
R
ON
PART
NC_/NO_
COMPARATORS
(Ω)
MAX4850 3.5/3.5 2
IN1
VCCCOUT2
15 14 13
NO2
12
COUT1
11
MAX4850
MAX4850H
GND
NC2
N.C.
COM2
10
IN2
9
OVER-RAIL HANDLING
Input signal passes through the switch
N.C.
N.C.
N.C.
COM1
DATA
SOURCE
NC1
IN1
16
15 14 13
1
2
MAX4852
3
4
MAX4852H
5678
NO1
GND
NC1
OUT+
OUT-
NO1
VCCN.C.
NO2
12
N.C.
11
COM2
10
IN2
9
NC2
N.C.
MAX4850_
COM1
IN1
INPUT SELECT
MAX4850H 3.5/3.5 2
High-impedance switch input
Input signal
MAX4852 3.5/7
passes through the switch
MAX4852H 3.5/7
High-impedance switch input
MUTE
AUDIO
SOURCE
OUT+
OUT-
NC2
NO2
COUT
IN2
COM2
V
V
CC
3
CIN
CC
MUTE BUTTON
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with Over-Rail Signal Handling
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products is a registered trademark of Maxim Integrated Products.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages
.)
ABRIDGED DATA SHEET
MARKING
D/2
D
0.10 C 0.08 C
8L 3x3
PKG
MIN.
NOM. MAX.
REF. MIN.
0.70 0.75 0.80
A
b
0.25 0.30 0.35
3.00 3.10
D
2.90
2.90 3.00 3.10
E
e
0.65 BSC.
0.55 0.75
L
0.35
8
2
ND
2
NE
0
0.02
A1
A2
k
0.05
0.20 REF
-
-
0.25
0.25
E
E/2
AAAA
C
L
12L 3x3
NOM. MAX. NOM.
0.70
0.75
0.80
0.20
0.25
0.30
2.90
3.00
3.10
3.00
2.90
3.10
0.50 BSC.
0.55
0.45
0.65
12N
3
0.0230.05
0
0.20 REF
-
-
A
A2
A1
16L 3x3
MIN. MAX.
0.70
0.20
2.90
2.90
0.50 BSC.
0.30
040.02
0.20 REF
0.25
(NE - 1) X e
E2/2
MAX.
1.25
1.25
0.95
0.95
1.25
D2/2
D2
b
C
L
e
21-0136
JEDEC
PIN ID
WEED-1
0.35 x 45°
WEED-11.25
0.35 x 45°
0.35 x 45°
WEED-2
0.225 x 45°
WEED-2
0.225 x 45°
WEED-2
0.35 x 45°
WEED-2
0.35 x 45° WEED-2
0.10 M C A B
L
12x16L QFN THIN.EPS
1
I
2
(ND - 1) X e
C
L
L
PKG.
0.75
0.80
0.25
0.30
3.00
3.10
3.10
3.00
0.40
0.50
16
4
0.05
-
CODES
TQ833-1 1.250.25 0.70 0.35 x 45° WEEC1.250.700.25
T1233-1
T1233-3
T1233-4
T1633-2 0. 95
T1633F-3
T1633FH-3 0.65 0.80 0.95
T1633-4 0. 95
T1633-5 0. 95
-
e
k
L
C
L
e
EXPOSED PAD VARIATIONS
D2
MIN.
NOM.
MAX.
MIN.
1.25
0.95
1.10
0.95
1.25
1.10
0.95 1.10 0.35 x 45°1.25 WEED-10.95
1.251.10
0.95
1.25
1.10
0.65
0.95
0.95
0.80
0.65
0.65 0.80
1.10 1.25 0.95 1.10
1.25
0.95
1.10
E2
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
E2
NOM.
1.10
1.100.95
1.10
0.80
1.10 1.25
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF T ERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS .
9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.
10. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
11. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
12. WARPAGE NOT TO EXCEED 0.10mm. PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
2
I
2
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