PI5A100W Pericom Semiconductor, PI5A100W Datasheet - Page 10

• Manufacturer Part Number: PI5A100W
• Description: IC SWITCH QUAD SPDT 16SOIC
• Manufacturer: Pericom Semiconductor

Specifications of PI5A100W

• Function: Switch
• Circuit: 4 x SPDT
• On-state Resistance: 10 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 2 V ~ 6 V
• Current - Supply: 1µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Applications
Audio Muting Function
Figure 8 shows the PI5A100 in an audio card muting application.
The original problem was one of excessive popping/clicking noise
appearing when connecting disconnecting external loads, and at
power on/off. The PI5A100 performs a muting function by grounding
the outputs at power on/off and during the transition time. The
32Ω headset impedance demands a very low and very flat switch-
on resistance to reduce THD and signal loss.
Figure 10: The PI5A100 momentarily mutes the stereo outputs by connecting them to ground during transition times.
Stereo Audio
From DAC
Input
Enable
Select
J1
2.5V
2.5V
Z3
Z4
-3V
22k!
Precision, Wide-Bandwidth, Quad SPDT Analog Switch
GND
10
Vcc
Paralleling two sections of the PI5A100 produces a Ron of 2.5Ω
with an unsurpassed ±0.5Ω flatness.
To handle AC signals it was necessary to power the device with
±3V provided by two Zener diodes: Z1 and Z2. The select and
Enable control signals are shifted by using twpo 2.5V Zener diodes
Z3,Z4 and pull down resistors connected to -3V.
Z1
Z1/Z2 - Dual SMT 3.0V Zener
-3V
Stereo Audio
Z2
Output
J2
-5V
+5V
10kΩ
32!
PS7012H
PI5A100
08/30/04