MAX4759 Maxim, MAX4759 Datasheet - Page 9

• Manufacturer Part Number: MAX4759
• Description: The MAX4758/MAX4759 quad double-pole/double-throw (DPDT) analog switches operate from a single +1
• Manufacturer: Maxim

The MAX4758/MAX4759 quad DPDT analog switches
operate from a single +1.8V to +5.5V supply. These
devices are fully specified for +3V applications.
The MAX4758/MAX4759 (switches 1–4) have a guaran-
teed 0.5Ω on-resistance, making them ideal for audio
switching applications. The MAX4759 also includes four
single-pole/double-throw (SPDT) switches (switches
5–8) that have a guaranteed 0.2Ω on-resistance, a low
25pF capacitance, 0.2ns change in skew making them
ideal for either data or audio switching applications.
These switches have four logic inputs to control two
switches in pairs.
The MAX4758/MAX4759 logic inputs accept up to
+5.5V regardless of the supply voltage. For example,
with a +3.3V supply, IN_ can be driven low to GND and
high to +5.5V, which allows mixed logic levels in a sys-
tem. Driving the control logic inputs rail-to-rail also mini-
mizes power consumption. For a +3V supply voltage,
the logic thresholds are 0.5V (low) and 1.4V (high).
Analog signal inputs over the full voltage range (0V to V+)
are passed through the switch with minimal change in on-
resistance (see the Typical Operating Characteristics).
The switches are bidirectional so NO_, NC_, and COM_
can be either inputs or outputs.
Power-supply bypassing improves noise margin and
prevents switching noise from propagating from the V+
supply to other components. A 0.1µF capacitor connect-
ed from V+ to GND is adequate for most applications.
CMOS devices require proper power-supply sequenc-
ing. Always apply V+ before the analog signals, espe-
Quad DPDT Audio/Data Switches in UCSP/QFN
Applications Information
_______________________________________________________________________________________
Power-Supply Sequencing
Detailed Description
Power-Supply Bypassing
Digital Control Inputs
Analog Signal Levels
cially if the input signal is not current limited. If
sequencing is not possible, and the input signal is not
current limited to less than 20mA, add a small-signal
diode (Figure 1). Adding the diode reduces the analog
range to a diode drop (0.7V) below V+ and increases
the on-resistance slightly. The maximum supply voltage
must not exceed +6V at any time.
For the latest application details on UCSP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliability
testing results, go to the Maxim website at www.maxim-
ic.com/ucsp for the Application Note, “UCSP—A Wafer-
Level Chip-Scale Package”.
Figure 1. Overvoltage Protection Using an External Blocking
Diode
UCSP Applications Information
NO
POSITIVE SUPPLY
V+
GND
D1
COM
MAX4758
MAX4759
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