ADXRS453BRGZ-RL Analog Devices Inc, ADXRS453BRGZ-RL Datasheet - Page 13

• Manufacturer Part Number: ADXRS453BRGZ-RL
• Manufacturer: Analog Devices Inc

Specifications of ADXRS453BRGZ-RL

• Lead Free Status / Rohs Status: Compliant

ADXRS453 SIGNAL CHAIN TIMING
The ADXRS453 primary signal chain is shown in Figure 28. The
signal chain is the series of necessary functional circuit blocks
through which the rate data is generated and processed. This
sequence of electromechanical elements determines how quickly
the device can translate an external rate input stimulus to an SPI
word that is sent to the master device.
The group delay, which is a function of the filter characteristic,
is the time required for the output of the low-pass filter to be
within 10% of the external rate input. In Figure 28, the group
delay is shown to be ~4 ms. Additional delay can be observed
due to the timing of SPI transactions and the population of the
rate data into the internal device registers. Figure 28 illustrates
this delay through each element of the signal chain.
Z-AXIS ANGULAR
RATE SENSOR
DELAY
<5µs
BAND-PASS
FILTER
DELAY
<5µs
Figure 28. Primary Signal Chain and Associated Delays
12-BIT ADC
PRIMARY SIGNAL CHAIN
Rev. A | Page 13 of 32
DELAY
<5µs
DEMOD
The transfer function for the rate data LPF is given as
where:
(f
The transfer function for the continuous self-test LPF is given as
where:
(f
0
0
is the resonant frequency of the ADXRS453.)
is the resonant frequency of the ADXRS453.)
CONTINUOUS
ARITHMETIC
LOGIC UNIT
T
T
RATE DATA




SELF-TEST
64
1
1
=
=
−
LPF
LPF
−
−
Z
16
f
(
f
Z
1
63
0
0
−
−
1
64
GROUP DELAY
1
GROUP DELAY
=
=
×




16
Z
1
2
<64ms
4ms
−
ms
1
kHz
)
(typ)
1
(typ)
TRANSACTION
SPI
DELAY
<2.2ms
ADXRS453
MISO
MOSI