adns-5700 Avago Technologies, adns-5700 Datasheet - Page 3

• Manufacturer Part Number: adns-5700
• Description: Pcb Design Guidelines For Adns-5700 One Chip Usb Led Sensor
• Manufacturer: Avago Technologies

4. Capacitors
5. 1.5KΩ pull up resistor
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Data subject to change. Copyright © 2005-2009 Avago Technologies. All rights reserved.
AV02-1737EN - January 15, 2009
• MUST have a 3.3uF and 1nF capacitor each on pin
• All caps MUST be as close to VDD5, VDD3, REG0
• Ceramic non-polarity caps and tantalum polarity
• Caps should have less than 5nH of self inductance.
• The 1.5kΩ pullup resistor should be ± 1% tolerance
9 and 10. The capacitors return path to ground for
REG0 pin 9 to 8 and for VDD3 pin 10 to 13.
sensor pins as possible and ground at their respective
sensor GND pins with trace length less than 5mm.
caps are recommended.
and can be placed near to either ADNS-5700 chip or
USB connection point.
Figure 5. VDD5 and REG0 bypass circuit
Figure 6. VDD3 bypass circuit
V
D
D
5
G
N
D
G
N
D
VDD3 bypass
caps
VDD5 bypass
caps
REG0 bypass
caps
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6. Resonator
7. USB Cable
8. Jumpers
• The traces from sensor to resonator MUST be equal
• The PCB area around the resonator MUST be guarded
• It is recommended to use a ground shielded oscillator
• MUST use a shielded USB cable to provide better
• It is recommended not use jumper on GND, D+
Figure 7. Oscillator Layout
and symmetrical in length.
with ground plane.
with 3 pins where the middle pin is ground.
EMI immunity.
and D– lines but jumper is allowed on digital lines:
Buttons (B1, B2, B3, B4 & B5), Z-wheel (ZA & ZB) and
Tilt-wheel (TW1 & TW2).
OSC
Pin 1 OSC_IN
Pin 2 GND
Pin 3 OSC_OUT
Guard GND