19-1325; Rev 0; 1/98
Low-Voltage, Phase-Reversal
Analog Switch
____________________________Features
♦ 5pC (max) Charge Injection
________________________Applications
_______________Ordering Information
Chopper-Stabilized Amplifiers
♦ 110Ω Signal Paths with ±5V Supplies
♦ Rail-to-Rail Signal Handling
♦ Transition Time 2kV ESD Protection per Method 3015.7
♦ TTL/CMOS-Compatible Input
♦ Small Packages: 8-Pin SO, DIP, and µMAX
PART
TEMP. RANGE
PIN-PACKAGE
Balanced Modulators/Demodulators
MAX4528CPA
0°C to +70°C
8 Plastic DIP
Data Acquisition
MAX4528CSA
MAX4528CUA
MAX4528C/D
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 SO
8 µMAX
Dice*
MAX4528EPA
MAX4528ESA
MAX4528EUA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Test Equipment
Audio-Signal Routing
8 Plastic DIP
8 SO
8 µMAX
*Contact factory for availability.
_________________________Pin Configuration/Functional Diagram/Truth Table
TOP VIEW
MAX4528
A 1
8
V+
B 2
7
X
GND 3
6
Y
IN 4
5
V-
IN
O
1
TRUTH TABLE
A
B
Y
X
X
Y
DIP/SO/µMAX
SWITCH POSITIONS SHOWN WITH IN = LOW
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.
For small orders, phone 408-737-7600 ext. 3468.
MAX4528
________________General Description
The MAX4528 low-voltage, CMOS analog IC is configured as a phase-reversal switch and optimized for highspeed applications such as chopper amplifiers. It
operates from a +2.7V to +12V single supply or from
±2.7V to ±6V dual supplies.
On-resistance (110Ω max) is matched between switches to 7Ω (max). Each switch can handle Rail-to-Rail®
analog signals. The leakage current is only 0.5nA at
+25°C and 20nA at +85°C. All digital inputs have 0.8V
to 2.4V logic thresholds, ensuring both TTL- and
CMOS-logic compatibility.
For higher voltage operation, see the MAX4526/
MAX4527 data sheet.
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
V+ .............................................................................-0.3V to 13V
V-...............................................................................-13V to 0.3V
V+ to V- .....................................................................-0.3V to 13V
All Other Pins (Note 1) ..........................(V- - 0.3V) to (V+ + 0.3V)
Continuous Current into Any Terminal..............................±20mA
Peak Current into Any Terminal
(pulsed at 1ms, 10% duty cycle)...................................±50mA
ESD per Method 3015.7 ..................................................>2000V
Continuous Power Dissipation (TA = +70°C) (Note 2)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.10mW/°C above +70°C) ....................330mW
Operating Temperature Ranges
MAX4528C_ _ .....................................................0°C to +70°C
MAX4528E_ _ ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: Signals on IN, A, B, X, or Y exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maximum
current rating.
Note 2: All leads are soldered or welded to PC boards.
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.
ELECTRICAL CHARACTERISTICS: ±5V Dual Supplies
(V+ = 5V, V- = -5V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 3)
MAX
UNITS
ANALOG SWITCH
Analog-Signal Range
A-X, A-Y, B-X, B-Y
On-Resistance
A-X, A-Y, B-X, B-Y
On-Resistance Match (Note 5)
A-X, A-Y, B-X, B-Y
On-Resistance Flatness (Note 6)
A-B, X-Y Leakage Current
(Note 7)
VA, VB,
VX, VY
(Note 4)
RON
VA = VB = ±3V, IA = IB = 1mA
∆RON
VA = VB = ±3V, IA = IB = 1mA
RFLAT(ON)
IA, IB,
IX, IY
C, E
V-
+25°C
70
C, E
V+
V
110
Ω
130
+25°C
3
C, E
7
9
VA = VB = 3V, 0V, -3V;
IA = IB = 1mA
+25°C
9
V+ = 5.5V; V- = -5.5V; VIN = 0V, 3V;
–
VA = ±4.5V; VB = +4.5V
+25°C
-0.5
C, E
-20
C, E
15
17
0.01
0.5
20
Ω
Ω
nA
LOGIC INPUT
IN Input Logic Threshold High
VINH
C, E
1.6
IN Input Logic Threshold Low
VINL
C, E
0.8
1.6
IN Input Current Logic High
or Low
IINH,
IINL
VIN_ = 0.8V or 2.4V
C, E
-1
0.03
tTRANS
VA = VB = ±3V, V+ = 5V, V- = -5V,
RL = 300Ω, Figure 3
+25°C
tBBM
VA = VB = ±3V, V+ = 5V, V- = -5V,
RL = 300Ω, Figure 4
+25°C
2.4
V
V
1
µA
SWITCH DYNAMIC CHARACTERISTICS
Transition Time
Break-Before-Make Time Delay
Charge Injection (Note 4)
A-X, A-Y, B-X, B-Y Capacitance
A-X, A-Y, B-X, B-Y Isolation
(Note 8)
2
70
C, E
100
125
1
20
ns
ns
C, E
Q
CL = 1.0nF, VA or VB = 0V, Figure 5
+25°C
1
CON
VA = VB = GND, f = 1MHz, Figure 6
+25°C
13
pF
VISO
RL = 50Ω, CL = 15pF, f = 1MHz,
VA = VB = 1VRMS, Figure 7
+25°C
-68
dB
_______________________________________________________________________________________
5
pC
Low-Voltage, Phase-Reversal
Analog Switch
MAX4528
ELECTRICAL CHARACTERISTICS: ±5V Dual Supplies (continued)
(V+ = 5V, V- = -5V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 3)
MAX
UNITS
POWER SUPPLY
Power-Supply Range
V+, V-
C, E
V+ Supply Current
I+
VIN = 0V or V+
V- Supply Current
I-
VIN = 0V or V+
±2.7
±6
+25°C
-1
1
C, E
-10
10
+25°C
-1
1
C, E
-10
10
V
µA
µA
ELECTRICAL CHARACTERISTICS: +5V Single Supply
(V+ = 5V, V- = 0V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 3)
MAX
UNITS
ANALOG SWITCH
Analog-Signal Range
A-X, A-Y, B-X, B-Y
On-Resistance
VA, VB,
VX, VY
(Note 4)
RON
VA = VB = 3V, IA = IB = 1mA
A-X, A-Y, B-X, B-Y
On-Resistance Match (Note 5)
∆RON
VA = VB = 3V, IA = IB = 1mA
A-B, X-Y Leakage Current
(Note 9)
IA, IB,
IX, IY
V+ = 5.5V; VIN = 0V, 3V;
VA = 4.5V, 1V; VB = 1V, 4.5V
C, E
V-
+25°C
120
C, E
V+
V
175
Ω
200
+25°C
5
C, E
10
12
+25°C
-0.5
C, E
-20
0.01
0.5
20
Ω
nA
LOGIC INPUT
IN Input Logic Threshold High
VINH
C, E
IN Input Logic Threshold Low
VINL
C, E
0.8
1.6
IN Input Current Logic High
or Low
IINH,
IINL
C, E
-1
0.03
1
110
175
VIN_ = 0.8V or 2.4V
1.6
2.4
V
V
µA
SWITCH DYNAMIC CHARACTERISTICS (Note 4)
Transition Time
Break-Before-Make Time Delay
Charge Injection
A-X, A-Y, B-X, B-Y Capacitance
A-X, A-Y, B-X, B-Y Isolation
(Note 8)
tTRANS
VA = VB = 3V, V+ = 5V, RL = 300Ω,
Figure 3
+25°C
tBBM
VA = VB = 3V, V+ = 5V, RL = 300Ω,
Figure 4
+25°C
Q
CL = 1.0nF, VA or VB = 0V, Figure 5
+25°C
1.5
COFF
VA = VB = GND, f = 1MHz, Figure 6
+25°C
17
pF
VISO
RL = 50Ω, CL = 15pF, f = 1MHz,
VA = VB = 1VRMS, Figure 7
+25°C
-70
dB
C, E
200
1
20
ns
ns
C, E
5
pC
POWER SUPPLY
Power-Supply Range
V+ Supply Current
V+
I+
VIN = 0V or V+
C, E
2.7
12
+25°C
-1
1
C, E
-10
10
V
µA
_______________________________________________________________________________________
3
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
ELECTRICAL CHARACTERISTICS: +3V Single Supply
(V+ = 2.7V to 3.6V, V- = 0V, V INH = 2.4V, V INL = 0.6V, T A = T MIN to T MAX, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 3)
MAX
UNITS
ANALOG SWITCH
Analog-Signal Range
VA, VB,
VX, VY
(Note 4)
C, E
RON
V+ = 3V, VA = VB = 1.5V,
IA = IB = 0.1mA
+25°C
IN Input Logic Threshold High
VINH
V+ = 3V
C, E
IN Input Logic Threshold Low
VINL
V+ = 3V
C, E
0.6
0.9
IN Input Current Logic High
or Low
IINH,
IINL
VIN_ = 0V or V+
C, E
-1
0.03
1
150
400
A-X, A-Y, B-X, B-Y
On-Resistance
V250
C, E
V+
V
900
Ω
1000
LOGIC INPUT
0.9
2.4
V
V
µA
SWITCH DYNAMIC CHARACTERISTICS (Note 4)
Transition Time
Break-Before-Make Time Delay
Charge Injection
tTRANS
VA = 1.5V, VB = 0V, V+ = 3V,
V- = 0V, RL = 1kΩ, Figure 3
+25°C
tBBM
VA = 1.5V, VB = 0V, V+ = 3V,
V- = 0V, RL = 1kΩ, Figure 4
+25°C
CL = 1.0nF, VA or VB = 0V, Figure 5
+25°C
Q
C, E
500
2
150
ns
C, E
1
ns
5
pC
12
V
POWER SUPPLY
Power-Supply Range
V+ Supply Current
V+, VI+
C, E
VIN = 0V or V+
2.7
+25°C
-1
1
C, E
-10
10
µA
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Guaranteed by design.
∆RON = ∆RON(MAX) - ∆RON(MIN).
Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as measured
over the specified analog-signal range.
Note 7: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 8: Off isolation = 20log10 [(VX or VY) / (VA or VB)], VA or VB = output, VA or VB = input to off switch.
Note 9: Leakage testing for single-supply operation guaranteed by testing with dual supplies.
Note 3:
Note 4:
Note 5:
Note 6:
4
_______________________________________________________________________________________
Low-Voltage, Phase-Reversal
Analog Switch
ON-RESISTANCE vs.
VA, VB, AND TEMPERATURE
(DUAL SUPPLIES)
TA = +125°C
TA = +85°C
V+ = 5V
V- = -5V
TA = +70°C
V+ = 2.7V
80
60
V+ = 3.3V
V+ = 5V
100
V+ = 7.5V
TA = -55°C
TA = -40°C
40
V- = 0V
V+ = 2V
RON (Ω)
RON (Ω)
RON (Ω)
100
V+ = 3.3V
V- = -3.3V
120
100
V+ = 2V
V- = -2V
1000
MAX4528-02
V+ = 1.2V
V- = -1.2V
V+ = 2.7V
V- = -2.7V
140
MAX4528-01
1000
ON-RESISTANCE vs. VA, VB
(SINGLE SUPPLY)
MAX4528-03
ON-RESISTANCE vs. VA, VB
(DUAL SUPPLIES)
V+ = 10V
TA = +25°C
20
10
0
-5 -4
-3 -2
-1
0
1
2
3
4
-5
5
-4
-3
-2
TA = +85°C
LEAKAGE (pA)
RON (Ω)
80
TA = +25°C
TA = -40°C
60
4
5
TA = -55°C
0
1
2
3
4
5
6
V+ = 5V
V- = 0V
0
1
2
3
4
∆Q MATCHING
5
0
10
-5
1
-10
0.1
-15
0.01
-20
QY
QX
V+ = 5V
V- = 5V
-25
-55
-25
5
35
65
95
-5
125
-4 -3
-2
-1
0
1
2
VA, VB (V)
TEMPERATURE (°C)
VA, VB (V)
CHARGE INJECTION, CHARGEINJECTION MATCHING vs. VA, VB
(+5V SUPPLY)
CHARGE INJECTION, CHARGEINJECTION MATCHING vs. VA, VB
(+3V SUPPLY)
TRANSITION TIME
vs. SUPPLY VOLTAGE
2
V+ = 3V
V- = 0V
3
3
4
250
5
MAX4528-09
∆Q MATCHING
MAX4528-08
4
MAX4528-07
4
10
10
100
5
9
CHARGE INJECTION, CHARGEINJECTION MATCHING vs. VA, VB
0.001
0
8
LEAKAGE vs. TEMPERATURE
40
20
7
VA, VB (V)
1000
140
100
3
10,000
160
120
2
Q (pC)
TA = +70°C
1
MAX4528-05
TA = +125°C
MAX4528-04
200
180
0
VA, VB (V)
VA, VB (V)
ON-RESISTANCE vs.
VA, VB, AND TEMPERATURE
(SINGLE SUPPLY)
-1
MAX4528-06
10
200
2
tTRANS (ns)
QX
QX
-2
Q (pC)
Q (pC)
0
QY
1
0
-4
QY
-6
∆Q MATCHING
-2
50
DUAL SUPPLIES
-3
-10
0
1
2
SINGLE SUPPLY
100
-1
V+ = 5V
V- = 0V
-8
150
3
VA, VB (V)
4
5
0
0
1
2
3
VA, VB (V)
4
5
2
4
6
8
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
10
5
MAX4528
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = -5V, GND = 0V, TA = +25°C, unless otherwise noted.)
_________________________________Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, GND = 0V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT AND GROUND CURRENT
vs. INPUT VOLTAGE
+2.7V SINGLE SUPPLY
200
V- = 0V
10-1
FREQUENCY RESPONSE
-10
-20
10-2
+5V SINGLE SUPPLY
100
10-4
LOSS (dB)
I+, IGND (A)
150
10-5
10-6
50
±5V DUAL SUPPLIES
-55
-25
5
35
65
TEMPERATURE (°C)
95
-120
0 1
2
3
4
5
6
7
VIN (V)
ON PHASE
V+ = 5V
V- = -5V
50Ω IN AND OUT
0.1
8 9 10 11 12
1
-150
-180
10
100
FREQUENCY (MHz)
0.1
MAX4528-14
3.0
LOGIC-LEVEL THRESHOLD (V)
MAX4526/27 TOC-13
1
2.5
2.0
1.5
1.0
0.5
0
0.01
10
100
1k
FREQUENCY (Hz)
6
10k 20k
0 1
0
-30
-60
-90
-120
LOGIC-LEVEL THRESHOLD
vs. SUPPLY VOLTAGE
10
THD (%)
30
10-11
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
V+ = 5V
V- = -5V
600Ω IN AND OUT
60
-50
10-10
125
100
-40
-90
-100
-110
10-9
0
120
-70
-80
10-8
2
180
150
90
OFF ISOLATION
-60
V+ = 5V
10-7
ON LOSS
-30
V+ = 12V
10-3
MAX4528-12
0
MAX4528-11
1
MAX4528-10
250
3
4 5
6 7
V+ (V)
8
9 10 11 12
_______________________________________________________________________________________
1000
PHASE (DEGREES)
TRANSITION TIME vs. TEMPERATURE
tTRANS (ns)
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
Low-Voltage, Phase-Reversal
Analog Switch
PIN
NAME
FUNCTION
1
A
Analog-Switch Input Terminal A.
Connected to Y when IN is low; connected to X when IN is high.
2
B
Analog-Switch Input Terminal B.
Connected to X when IN is low; connected to Y when IN is high.
3
GND
Ground. Connect GND to digital
ground. (Analog signals have no
ground reference; they are limited to
V+ and V-.)
4
IN
Logic-Level Control Inputs (see Truth
Table)
5
V-
Negative Analog Supply-Voltage
Input. Connect V- to GND for singlesupply operation.
6
Y
Analog-Switch Output Terminal Y
7
X
Analog-Switch Output Terminal X
8
V+
Positive Analog/Digital Supply-Voltage
Input. Internally connected to substrate.
Note: Pins A, B, X, and Y are identical and interchangeable.
Any may be considered as an input or output; signals pass
equally well in either direction. However, AC symmetry is best
when A and B are the inputs and X and Y are the outputs.
Reduce AC balance in critical applications by using A and X or
A and Y as the input, and B and X or B and Y as the output.
_______________Detailed Description
The MAX4528 is a phase-reversal analog switch consisting of two normally open and two normally closed CMOS
analog switches arranged in a bridge configuration.
Analog signals are put into two input pins and taken out
of two output pins. A logic-level signal controls whether
the input signal is routed through normally or inverted. A
low-resistance DC path goes from inputs to outputs at all
times, yet isolation between the two signal paths is excellent. Analog signals range from V- to V+.
These parts are characterized and optimized with ±5V
supplies, and can operate from a single supply.
The MAX4528 is designed for DC and low-frequencysignal phase-reversal applications, such as chopper
amplifiers, modulator/demodulators, and self-zeroing or
self-calibrating circuits. Unlike conventional CMOS
switches externally wired in a bridge configuration,
both DC and AC symmetry are optimized with a small
8-pin configuration that allows simple board layout and
isolation of logic signals from analog signals.
Power-Supply Considerations
Overview
The MAX4528’s construction is typical of most CMOS
analog switches. It has three supply pins: V+, V-, and
GND. V+ and V- drive the internal CMOS switches and
set the analog-voltage limits on any switch. Reverse
ESD-protection diodes are internally connected
between each analog-signal pin and both V+ and V-.
One of these diodes conducts if any analog signal
exceeds V+ or V-.
Virtually all of the analog leakage current is through the
ESD diodes to V+ or V-. Although the ESD diodes on a
given signal pin are identical and therefore fairly well
balanced, they are reverse biased differently. Each is
biased by either V+ or V- and the analog signal. This
means their leakages vary as the signal varies. The difference in the two diode leakages from the signal path
to the V+ and V- pins constitutes the analog-signal-path
leakage current. All analog leakage current flows to the
supply terminals, not to the other switch terminal. This
explains how both sides of a given switch can show
leakage currents of either the same or opposite polarity.
There is no connection between the analog-signal
paths and GND. The analog-signal paths consist of an
N-channel and P-channel MOSFET with their sources
and drains paralleled and their gates driven out-ofphase to V+ and V- by the logic-level translators.
V+ and GND power the internal logic and logic-level
translator and set the input logic threshold. The logiclevel translator converts the logic levels to switched V+
and V- signals to drive the analog switches’ gates. This
drive signal is the only connection between GND and
the analog supplies. V+ and V- have ESD-protection
diodes to GND. The logic-level input has ESD protection to V+ and V-, but not to GND, so the logic signal
can go below GND (as low as V-) when bipolar supplies are used.
Increasing V- has no effect on the logic-level thresholds,
but it does increase the drive to the internal P-channel
switches, reducing overall switch on-resistance. V- also
sets the negative limit of the analog-signal voltage.
The logic-level input pin (IN) has ESD-protection diodes
to V+ and V- but not to GND, so it can be safely driven
to V+ and V-. The logic-level threshold (VIN) is CMOS/
TTL compatible when V+ is between 4.5V and 12V
(see Typical Operating Characteristics).
_______________________________________________________________________________________
7
MAX4528
_____________________Pin Description
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
Bipolar Supplies
The MAX4528 operates with bipolar supplies between
±2.7V and ±6.0V. The V+ and V- supplies need not be
symmetrical, but their sum cannot exceed the 13V
absolute maximum rating (see Absolute Maximum
Ratings).
Single Supply
The MAX4528 operates from a single +2.7V to +12V
supply when V- is connected to GND. Observe all of
the bipolar precautions when operating from a single
supply.
__________Applications Information
The MAX4528 is designed for DC and low-frequencysignal phase-reversal applications. Both DC and AC
symmetry are optimized for use with ±5V supplies.
Signal Phase/Polarity Reversal
The MAX4528 can reverse the phase or polarity of a
pair of signals that are out-of-phase and balanced to
ground. This is done by routing signals through the
MAX4528 and, under control of IN, reversing the two
signals paths inside the switch before sending out to a
balanced output. Figure 1 shows a typical example.
The MAX4528 cannot reverse the phase or polarity
of a single grounded signal, as can be done with an
inverting op amp or transformer.
Balanced Modulator/Demodulator
The MAX4528 can be used as a balanced modulator/
demodulator at carrier frequencies up to 100kHz
(Figure 2). Higher frequencies are possible, but as frequency increases, small imbalances in the MAX4528’s
internal capacitance and resistance gradually impair
performance. Similarly, imbalances in external circuit
capacitance and resistance to GND reduce overall carrier suppression.
The carrier is applied as a logic-level square wave to
IN. (Note that this voltage can go as negative as V-.)
For best carrier suppression, the power-supply voltages should be equal, the square wave should have a
precise 50% duty cycle, and both the input and output
signals should be symmetrical around ground. Bypass
V+ and V- to GND with 0.1µF ceramic capacitors, as
close to the IC pins as possible. In critical applications,
carrier suppression can be optimized by trimming duty
cycle, DC bias around GND, or external source and
load capacitance.
In signal lines, balancing both capacitance and resistance to GND produces the best carrier suppression.
Transformer coupling of input and output signals
provides the best isolation and carrier suppression.
Transformers can also provide signal filtering, impedance matching, or low-noise voltage gain. Use a
center-tapped transformer or high-resistance voltage
divider to provide a DC path to GND on either the input
or output signal. This ensures a DC path to GND and
symmetrical operation of the internal switches.
V+
V+
MAX4528
V+
A
INPUTS
INPUTS
X
B
Y
LOGIC HIGH
V-
V-
X
B
OUTPUTS
IN
GND
V+
A
Y
LOGIC LOW
MAX4528
IN
GND
TRUTH TABLE
IN
A
B
O
Y
X
1
X
Y
VV-
Figure 1. Typical Application Circuits
8
_______________________________________________________________________________________
OUTPUTS
Low-Voltage, Phase-Reversal
Analog Switch
MAX4528
TIME WAVEFORMS
LOGIC
(CARRIER)
OUTPUT SPECTRUM
A
LOWER
SIDEBAND
MODULATOR/DEMODULATOR CIRCUIT
UPPER
SIDEBAND
SUPPRESSED CARRIER
V+
B
V+
NPUT
A
X
B
Y
IN
OUTPUT
X
AMPLITUDE
GND V-
LOGIC (CARRIER)
MAX4528
V-
Y
FREQUENCY
X-Y
(OUTPUT)
Figure 2. Balanced Modulator/Demodulator
______________________________________________Test Circuits/Timing Diagrams
V+
VIN
IN
V+
V+
A
+3V
50%
VIN
0V
50Ω
B
MAX4528
-3V
X
GND
V-
VB
VOUT
300Ω
35pF
90%
VOUT
0V
V-
90%
VA
tTRANS
tTRANS
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 3. Address Transition Time
_______________________________________________________________________________________
9
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
_________________________________Test Circuits/Timing Diagrams (continued)
V+
VIN
VIN
V+
IN
50Ω
t F < 5ns
t R < 5ns
V+
A
B
MAX4528
VOUT
X OR Y
GND
50%
0V
+3V
V-
90%
VOUT
300Ω
35pF
V-
0V
tBBM
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 4. Break-Before-Make Interval
V+
V+
B OR A
V+
N.C.
A OR B
VIN
VA OR VB
0V
MAX4528
VIN
IN
50Ω
X OR Y
GND
V-
VOUT
CL
1000pF
VOUT
∆VOUT
V∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Q = ∆VOUT x CL
Figure 5. Charge Injection
10
______________________________________________________________________________________
Low-Voltage, Phase-Reversal
Analog Switch
V+
V+
A
B
MAX4528
V+
X
SWITCH
SELECT
1MHz
CAPACITANCE
ANALYZER
Y
IN
GND
VV-
Figure 6. A, B, X, Y Capacitance
V+ 10nF
V+
A, B
NETWORK
ANALYZER
VIN
50Ω
V+
VOUT
SWITCH
SELECT
X, Y
V-
GND
MEAS.
50Ω
VOUT
VIN
ON LOSS = 20log
VOUT
VIN
50Ω
MAX4528
IN
OFF ISOLATION = 20log
REF
50Ω
10nF
V-
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
OFF ISOLATION IS MEASURED BETWEEN A, B AND "OFF" X, Y TERMINAL.
ON LOSS IS MEASURED BETWEEN A, B AND "ON" X, Y TERMINAL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 7. Off Isolation and On Loss
______________________________________________________________________________________
11
MAX4528
_________________________________Test Circuits/Timing Diagrams (continued)
____________________________________________________________Chip Topography
TRANSISTOR COUNT: 141
SUBSTRATE IS INTERNALLY CONNECTED TO V+
A
V+
X
0.054"
(1.37mm)
B
Y
GND
N
V-
0.038
(0.97mm)
________________________________________________________Package Information
8LUMAXD.EPS
MAX4528
Low-Voltage, Phase-Reversal
Analog Switch
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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