MAX14800_09 Datasheet, PDF (12/18 Pages) Maxim Integrated Products – Low-Charge Injection, 16-Channel, High-Voltage Analog Switches

Low-Charge Injection, 16-Channel,
High-Voltage Analog Switches
Applications Information
For medical ultrasound applications, see Figures 4, 5,
and 6.
Logic Levels
The MAX14800–MAX14803 digital interface 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 MAX14800–MAX14803 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
registers can be included anywhere in series with the
MAX14800–MAX14803 data chain.
Supply Sequencing and Bypassing
The MAX14800–MAX14803 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
U10
U11
U1n
DIN1
DIN
DOUT
DIN
DOUT
DIN
DOUT
MAX14800–
MAX14800–
MAX14803
MAX14803
CLK
CLK
CLK
LE
LE
CLR
LE
CLR
MAX14800–
MAX14803
CLK
LE
CLR
CLR
U20
U21
U2n
DIN2
DIN
DOUT
DIN
DOUT
DIN
DOUT
MAX14800–
MAX14803
CLK
LE
CLR
MAX14800–
MAX14803
CLK
LE
CLR
MAX14800–
MAX14803
CLK
LE
CLR
Figure 3. Interfacing Multiple Devices by Daisy-Chaining
12 ______________________________________________________________________________________