IDG-650 INVENSENSE, IDG-650 Datasheet - Page 14

• Manufacturer Part Number: IDG-650
• Description: GYRO, DUAL (X+Y) AXIS, +/-2000 DEG/S
• Manufacturer: INVENSENSE

Specifications of IDG-650

• No. Of Axes: 2
• 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

8.2.8
Auto Zero (AZ) is a function that is used to maximize the gyro‟s dynamic range when using the
X4.5OUT and Y4.5OUT outputs.
AZ works by keeping the gyro‟s Zero-Rate Output (ZRO) close to VREF, and thus allows the user to
achieve a wider usable signal range, without using external analog high pass filters.
When activated, the Auto Zero circuit internally nulls the ZRO to VREF. The typical usage of Auto
Zero is in conditions where:
The Auto Zero function is initiated on the rising edge of the AZ pin. The Auto Zero settling time is
typically 7ms. This time includes the time required for nulling the ZRO and for the settling of the
internal low pass filter (LPF). If the external LPF bandwidth is less than 200Hz, the Auto Zero settling
time will be longer than specified.
The AZ pulse width should meet the specified minimum time requirement of 2µs to start the Auto Zero
function, and should be shorter than the maximum specified time of 1,500µs. The Auto Zero pulse
should occur after the start-up period to cancel any initial calibration error.
If the AutoZero function is not used, the AZ pin ( pin 24) should be connected to ground.
8.2.9
XAGC (pin 6) and YAGC (pin 15) pins are high impedance (>1Mohm) nodes. Any coating, glue or
epoxy on these pins or on the capacitors connected to these pins, will affect part performance and
should be avoided.
8.2.10
The on-chip charge pump requires a bypass capacitor for stable operation. This capacitor should be
0.1µF and rated for 25V.
8.2.11
Proper cleaning of PCB solder pads prior to assembly is recommended. PCB surface contaminants at
XAGC (pin 6) or YAGC (pin 15) device interfaces may affect part performance.
8.2.12
The IDG-650 gyroscope is insensitive to acoustic vibration except for a narrow frequency range near
the gyro‟s resonant frequency. The typical bandwidth of the acoustic sensitivity is 200Hz. It is
recommended that products using the IDG-650 gyroscope be designed such that the acoustic noise in
the 20kHz to 31kHz range be attenuated by the product‟s enclosure.
8.2.13
The IDG-650 gyroscope can be permanently damaged by an electrostatic discharge. ESD precautions
for handling and storage are recommended.
1. The gyro‟s motion is known, such as when:
2. The DC value of the gyro output is not important, but only the AC value is. In this case, a digital
ac filter may be used to extract the gyro data, which provides a higher-quality output than is
possible with an analog R-C filter.
Auto Zero
High Impedance Nodes
Charge Pump
Proper Interface Cleaning
Acoustic Noise Sensitivity
Electrostatic Discharge Sensitivity
a. The gyro is stationary.
b. Other sensors can report angular rotation rate.
IDG-650 Dual-Axis Gyroscope
Product Specification
14 of 25
PS-IDG-0650B-00-05
Release Date: 05/20/10