MAX4526CSA+ Maxim Integrated Products, MAX4526CSA+ Datasheet - Page 7

• Manufacturer Part Number: MAX4526CSA+
• Description: IC SWITCH DUAL SPDT 8SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX4526CSA+

• Function: Switch
• Circuit: 2 x SPDT
• On-state Resistance: 175 Ohm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 4.5 V ~ 36 V, ±4.5 V ~ 18 V
• Current - Supply: -400µA, 700µA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• On Resistance (max): 200 Ohms
• Off Isolation (typ): - 65 dB
• Supply Voltage (max): +/- 18 V
• Supply Voltage (min): +/- 4.5 V
• Maximum Power Dissipation: 471 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Description/function: Phase-Reversal Analog Switch
• Input Level: CMOS, TTL
• Minimum Operating Temperature: 0 C
• Off State Leakage Current (max): 0.5 nA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX4526/MAX4527 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 connect-
ed 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 dif-
ference 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-of-phase 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 logic-
level 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 protec-
tion to V+ and to V- but not to GND, so the logic signal
can go below GND (as low as V-) when bipolar sup-
plies 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 the 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, V
TTL compatible when V+ is between 4.5V and 36V
(see Typical Operating Characteristics ).
Power-Supply Considerations
_______________________________________________________________________________________
Phase-Reversal Analog Switches
IN
, is CMOS/
Overview
The MAX4526/MAX4527 operate with bipolar supplies
between ±4.5V and ±18V. However, since all factory
characterization is done with ±15V supplies, specifica-
tions at other supplies are not guaranteed. The V+ and
V- supplies need not be symmetrical, but their sum
cannot exceed the absolute maximum rating of 44V
(see Absolute Maximum Ratings ).
Figure 2. Balanced Modulator/Demodulator
(CARRIER)
(OUTPUT)
LOGIC
INPUT
X-Y
A
B
X
Y
TIME WAVEFORMS
LOGIC (CARRIER)
MODULATOR/DEMODULATOR CIRCUIT
AMPLITUDE
SIDEBAND
LOWER
IN
A
B
V+
V+
GND
SUPPRESSED CARRIER
OUTPUT SPECTRUM
V+
V-
X
Y
FREQUENCY
Bipolar Supplies
MAX4526
MAX4527
UPPER
SIDEBAND
OUTPUT
7