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MICRF104 Datasheet(PDF) 2 Page - Micrel Semiconductor

Part No. MICRF104
Description  1.8V, QwikRadio™ UHF ASK Transmitter
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF104 Datasheet(HTML) 2 Page - Micrel Semiconductor

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MICRF104
Micrel
MICRF104
2
November 8, 2001
Pin Description
Pin Number
Pin Name
Pin Function
1
VDDPWR
Positive power supply input for the DC/DC converter.
2, 4, 13
VSS
Ground return
3
5V
5V Output from the DC / DC converter
5
REFOSC
This is the timing reference frequency which is the transmit frequency
divided by 32. Connect a crystal (mode dependent) between this pin and
VSS, or drive the input with an AC coupled 0.5Vpp input clock. See
Refer-
ence Oscillator Section in this data sheet
6
RFSTBY
Input for transmitter standby control pin is pulled to VDDRF for transmit
operation and VSS for stand-by mode.
7
ANTM
Negative RF power output to drive the low side of the transmit loop antenna
8
ANTP
Positive RF power output to drive the high side of the transmit loop antenna
9
ASK
Amplitude Shift Key modulation data input pin.
10
VDDRF
Positive power supply input for the RF circuit. A power supply bypass
capacitor connected from VDDRF to VSS should have the shortest possible
path.
11
PC
Power Control Input. The voltage at this pin should be set between 0.3V to
0.4V for normal operation.
12
SW
DC/DC converter Switch. NPN output switch transistor collector.
14
EN
Chip Enable input. Active high
Pin Configuration
1
VDDPWR
VSS
5V
VSS
REFOSC
RFSTBY
ANTM
14 EN
VSS
SW
PC
VDDRF
ASK
ANTP
13
12
11
10
9
8
2
3
4
5
6
7
MICRF104BM


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