Datasheet

Block diagram ST7540
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1 Block diagram
Figure 1. Block diagram
SERIAL
INTERFACE
CARRIER
DETECTION
PLL
CD/PD
RxD
CLR/T
REG/DATA
RxTx
TxD
Vdc
V
CC
PA_OUT
TX_OUT
Vsense
CL
RX_IN
TEST2
UART/SPI
TEST1 BU/THERM
X1 WD
RSTO MCLK
X2
DIGITAL
FILTER
FSK
DEMOD
IF
FILTER
TX
FILTER
FILTER
FILTER
BU
DAC
OSC
AGC
AMPL
TEST
ALC
PA
VREG
CURRENT
CONTROL
VOLTAGE
CONTROL
FSK
MODULATOR
TIME BASE
CONTROL
REGISTER
D03IN1407A
PA_IN-
+
-
PA_IN+
V
SS
VREG
V DD
SV SS GND