Cirrus Logic CS5376A - Manual (Page 19)

CS5376A
DS612F4 19
3. SYSTEM DESIGN WITH CS5376A
Figure 9 illustrates a simplified block diagram of
the CS5376A in a multi-channel measurement sys-
tem.
Up to four differential sensors are connected
through CS3301A/02A differential amplifiers to
the CS5371A/72A
∆Σ modulators, where analog to
digital conversion occurs. Each modulators 1-bit
output connects to a CS5376A MDATA input,
where the oversampled
∆Σ data is decimated and
filtered to 24-bit output samples at a programmed
output rate. These output samples are buffered in
an 8-deep data FIFO and passed to the system te-
lemetry on command.
System self tests are performed by connecting the
CS5376A test bit stream (TBS) generator to the
CS4373A test DAC. Analog tests drive differential
signals from the CS4373A test DAC into the mul-
tiplexed inputs of the CS3301A/02A amplifiers or
directly to the sensors through external analog
switches. Digital loopback tests internally connect
the TBS digital output directly to the CS5376A
modulator inputs.
3.1 Power Supplies
The multi-channel system shown in Figure 9 typi-
cally operates from a
± 2.5 V analog power supply
and a 3.3 V digital power supply. The CS5376A
logic core can be powered from 3 V to minimize
power consumption, if required.
3.2 Reset Control
System reset is required only for the CS5376A de-
vice, and is a standard active low signal that can be
generated by a power supply monitor or microcon-
troller. Other system devices default to a power-
down state when the CS5376A is reset.
Figure 9. Multi-Channel System Block Diagram
∆Σ
Modulator
∆Σ
Modulator
Digital Filter
AMP
AMP
AMP
AMP
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
M
U
X
M
U
X
M
U
X
M
U
X
Test
DAC
µController
or
Configuration
EEPROM
Communication
Interface
CS3301A
CS3302A
CS5371A
CS5371A
CS5376A
CS4373A
System Telemetry
CS5372A
CS5372A
Switch
MUX Switch
MUX
CS3301A
CS3302A
CS3301A
CS3302A
CS3301A
CS3302A