ISZ-650 INVENSENSE, ISZ-650 Datasheet - Page 12
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ISZ-650
Manufacturer Part Number
ISZ-650
Description
GYRO, SINGLE (Z) AXIS, +/-2000 DEG/S
Manufacturer
INVENSENSE
Datasheet
1.ISZ-650.pdf
(24 pages)
Specifications of ISZ-650
No. Of Axes
1
Sensor Case Style
QFN
No. Of Pins
28
Supply Voltage Range
2.7V To 3.3V
Operating Temperature Range
-20°C To +85°C
Sensitivity Per Axis
0.5mV / ° / S
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ISZ-650
Manufacturer:
INVENSENSE
Quantity:
7 600
8.2
CONFIDENTIAL & PROPRIETARY
8.2.1
The gyro is most susceptible to power supply noise (ripple) at frequencies less than 100Hz. At less
than 100Hz, the PSRR is determined by the overall internal gain of the gyroscope. Above 100Hz, the
PSRR is determined by the characteristics of the on-chip low-pass filter. Above 1kHz, the PSRR is
relatively constant except for a narrow frequency range corresponding to the resonant frequency of the
Z-gyroscope.
8.2.2
The Power Supply Voltage (VDD) rise time (10% - 90%) must be less than 20ms at VDD (Pins 9 and
19) for proper device operation.
The ISZ-650 gyroscope should be isolated from system power supply noise by a combination of an RC
filter that attenuates high frequency noise and a Low Drop Out linear regulator (LDO) that attenuates
low frequency noise. Figure 4 shows a typical configuration.
The low-pass RC filter should be chosen such that it provides significant attenuation of system noise at
high frequencies. The LDO should be a low noise regulator (<100V/rtHz) that exhibits good noise
rejection at low frequencies.
8.2.3
The scale factor of the gyroscope depends on the amplitude of the mechanical motion and the trim
setting of the internal programmable gain stages.
amplitude to maintain constant sensitivity over the specified temperature range. The capacitor
connected to Pin 15 (ZAGC) is a compensation capacitor for the amplitude control loop.
8.2.4
A built-in Proportional-To-Absolute-Temperature (PTAT) sensor provides temperature information on
Pin 23 (PTATS). The temperature sensor output signal is analog, and has a bias of approximately
1.25V at room temperature, and increases at a rate of 4mV/ºC. The output impedance is nominally
12kΩ and is therefore not designed to drive low impedance loads. If necessary, the output can be
externally buffered with a low offset-drift buffer, and optionally a low-pass filter to minimize noise.
8.2.5
After the demodulation stage, there is a low-pass filter. This filter limits noise and high frequency
artifacts from the demodulator before final amplification. The following graph shows the typical gain
and phase response. The low-pass filter has been designed for a nominally flat gain up to the cutoff
frequency while still achieving a low phase delay at 10Hz and 30Hz.
Design Considerations
Power Supply Rejection Ratio
Power Supply Filtering
Amplitude Control
Temperature Sensor
Internal Low-Pass Filter
ISZ-650 Single-Axis Z-Gyroscope
Product Specification
12 of 24
Figure 4
The oscillation circuit precisely controls the
PS-ISZ-0650B-00-02
Release Date: 07/08/09