MAX14802/MAX14803/MAX14803A
Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
13
Maxim Integrated
Applications Information
For medical ultrasound applications, see Figures 4, 5,
and 6.
Logic Levels
The MAX14802/MAX14803/MAX14803A digital inter-
face inputs CLK, DIN, LE, and CLR operate on the V
DD
supply voltage.
Daisy-Chaining Multiple Devices
Digital output DOUT is provided to allow the connection
of multiple MAX14802/MAX14803/MAX14803A devices
by daisy-chaining (Figure 3). Connect each DOUT to the
DIN of the subsequent device in the chain. Connect CLK,
LE, and CLR inputs of all devices, and drive LE logic-low
to update all devices simultaneously. Drive CLR high to
open all the switches simultaneously. Additional shift reg-
isters can be included anywhere in series with the
MAX14802/MAX14803/MAX14803A data chain.
Supply Sequencing and Bypassing
The MAX14802/MAX14803/MAX14803A do not require
special sequencing of the V
DD
, V
PP
, and V
NN
supply
voltages; however, analog switch inputs must be
unconnected, or satisfy V
NN
≤ (V
COM_
, V
NO_
) ≤ V
PP
during power-up and power-down. Bypass V
DD
, V
PP
,
and V
NN
to GND with a 0.1μF ceramic capacitor as
close as possible to the device.
Application Diagrams
