MICRF004 Просмотр технического описания (PDF) - Micrel

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производитель

MICRF004

QwikRadio™ Low-Power VHF Receiver

Micrel 

MICRF004/RF044

SEL0, SEL1, SWEN, and SHUT Pins

VDDBB

Q1

VSSBB

SHUT

Q4

Q2

to Internal

Circuits

SEL0,

SEL1,

Q3

SWEN

VSSBB

Figure 6a. SEL0, SEL1, SWEN

VDDBB

Q1

VSSBB

SHUT

Q2

to Internal

Circuits

Q3

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 5µA,

leading to an impedance to the VDDBB supply of typically

1MΩ.

Micrel

MICRF004

10

February 9, 2000

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