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Reconstruction
filters
RECDCI
IIN
IINBER
LPO
LPBW
TXON
QIN
QINBAR
RECDCQ
VCCIFLO
GNDIFLO
VCCIFVCO
GNDIFVCO
IFLO
IFLOBAR
VTUNEIF
GNDTUIF
PHDIFOUT
IFLOON
IC800 VHI3981D28N-1R (LP3981ILD): 2.8 V REGULATOR
Pin No.
Terminal name
1
VOUT
2
VIN
3
VOUT-SENSE
4
GND
5
BYPASS
6
VEN
CONFIDENTIAL
IQ-modulator
TXON
IQGAIN
TXON
VGAGAIN
QVGAGAIN
TXON
IF PLL
RFRDIV
TBIFS1
RFNDIV
TBIFS0
DIV
TBIFVCO
PHD
RFIPHO
TBRFS1
TBRFS0
TBRFVCO
Input/Output
Output
Output Voltage of the LDO
Input
Input Voltage of the LDO
Output
Output. Voltage Sense Pin
–
Common Earth
–
Optional bypass capacitor for noise reduction
Input
Enable Input Logic, Enable High
VIN
2
Vreference
Fast Turn
VEN
6
1.23 V
On Circuit
BYPASS
5
VGA
IF BP
RF-mixer and RF buffer
Filter
TXON
BUFFGAIN
BUFFGAIN2
GAINMETH
RF PLL
DIV
RFLOON
LOINTEXT
PHD
SERIAL BUS
Description of terminal
1
VOUT
3
VOUT-SENSE
R2
Over Current &
Thermal Protection
4
GND
6 – 9
TXON
RFBIAS
OUT
OUTBAR
GNDRFLO
RFLOON
LOINTEXT
RFLO
RFLOBAR
VTUNERF
RFVCOC
GNDTURF
VCCRFVCO
GNDRFVCO
VCCRFPLL
GNDRFPLL
CLK
DATA
Serial
STROBE
Bus
Logic
802SH
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