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MICRF004 Datasheet(PDF) 10 Page - Micrel Semiconductor

Part # MICRF004
Description  QwikRadio??Low-Power VHF Receiver Advance Information
PDF  16 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF004 Datasheet(HTML) 10 Page - Micrel Semiconductor

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MICRF004/RF044
Micrel
MICRF004
10
February 9, 2000
SEL0, SEL1, SWEN, and SHUT Pins
to Internal
Circuits
VDDBB
VSSBB
SEL0,
SEL1,
SWEN
Q2
Q3
Q1
VSSBB
SHUT
Q4
Figure 6a. SEL0, SEL1, SWEN
to Internal
Circuits
VDDBB
VSSBB
SHUT
Q2
Q3
Q1
VSSBB
Figure 6b. SHUT
Control input circuitry is shown in Figures 6a and 6b. The
standard input is a logic inverter constructed with minimum
geometry MOSFETs (Q2, Q3). P-channel MOSFET Q1 is a
large channel length device which functions essentially as a
“weak” pullup to VDDBB. Typical pullup current is 5
µA,
leading to an impedance to the VDDBB supply of typically
1M
Ω.



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