Datasheet MAX4754, MAX4754A, MAX4755, MAX4756, MAX4756A (Maxim) - 9

0.5
Ω
, Quad SPDT Switches in UCSP/QFN MAX4754/MAX4754A/MAX4755/MAX4756/MAX4756A Typical Operating Circuit
INTERNAL EAR SPEAKER (32Ω) INTERNAL INA INA INA SPEAKER (8Ω) LOUD SPEAKER (8Ω) SPEAKER (8Ω) NO1 NO1 NO1 COM1 COM1 COM1 11Ω NC1 NC1 NC1 NO2 NO2 NO2 COM2 COM2 COM2 11Ω NC2 NC2 NC2 NO3 NO3 NO3 COM3 COM3 COM3 NC3 NC3 NC3 NO4 NO4 NO4 COM4 COM4 COM4 NC4 HEADPHONE NC4 CAR-KIT SPEAKER (8Ω) NC4 HEADPHONE INB (32Ω) INB (32 EN Ω) MAX4754/ MAX4755 MAX4756/ MAX4754A MAX4756A
Detailed Description
inputs rail-to-rail also minimizes power consumption. For a +3V supply voltage, the logic thresholds are 0.5V The MAX4754/MAX4754A/MAX4755/MAX4756/MAX4756A (low) and 1.4V (high). low on-resistance analog switches operate from a single +1.8V to +5.5V supply. The devices are fully specified For the MAX4756/MAX4756A, drive EN low to enable the for nominal 3V applications. COM_. When EN is high, COM _ is high impedance. The MAX4754/MAX4754A DPDT switch have two logic
Analog Signal Levels
control inputs with each input controlling two SPDT Analog signal inputs over the full voltage range (0V to switches. Each switch has a 0.5Ω on-resistance in the V+) are passed through the switch with minimal change NO and NC terminals making it ideal for switching in on-resistance (see the Typical Operating Charac- audio signals. teristics). The switches are bidirectional so NO_, NC_, The MAX4755 DPDT switch also has four 0.5Ω SPDT and COM_ can be either inputs or outputs. switches with the switch pairs 1 and 2 adding an 11.5Ω
Power-Supply Bypassing
series resistor to the NC terminal. This feature allows Power-supply bypassing improves noise margin and pre- the user to drive an 8Ω speaker as a 32Ω load, allowing vents switching noise from propagating from the V+ sup- it to be used as an ear speaker. Two logic control ply to other components. A 0.1µF capacitor connected inputs are used to control the four switches. from V+ to GND is adequate for most applications. The MAX4756/MAX4756A has four 0.5Ω SPDT switches controlled by one logic control input (INA) and EN input
UCSP Applications Information
to disable the switches. For the latest application details on UCSP construction,
Applications Information
dimensions, tape carrier information, printed circuit board techniques, bump-pad layout, and recommend-
Digital Control Inputs
ed reflow temperature profile, as well as the latest infor- The MAX4754/MAX4754A/MAX4755/MAX4756/MAX4756A mation on reliability testing results, go to the Maxim logic inputs accept up to +5.5V regardless of the sup- website at www.maxim-ic.com/ucsp for the Application ply voltage. For example, with a +3.3V supply IN_ can Note: UCSP—A Wafer-Level Chip-Scale Package. be driven low to GND and high to +5.5V, which allows mixed logic levels in a system. Driving the control logic
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