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AN1714 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN1714
Description  transceiver demonstration kit description
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1714 Datasheet(HTML) 22 Page - STMicroelectronics

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Demonstration board for ST7538Q
AN1714
22/46
Figure 19.
Voltage regulation and current protection components
The value of the transmitted signal is programmed using the resistors divider R12/R14 (the
capacitor C17 has a decoupling function for the DC value on the VSENSE pin).
The regulations loop changes the VCA amplifier gain until the sinusoidal signal on the
VSENSE pin reaches the values of VCLTH (see datasheet values) with a tolerance of about
±10% (VCLHYST hysteresis value).
The following simplified formula calculates the resistors divider ratio.
Equation 8
For a more precise rate in the formula, the input impedance of the VSENSE pin (~36 KΩ) and
the decoupling capacitor C17 (for values of some nanofarads this capacitor can be
neglected) have to be considered also.
Figure 20.
Voltage regulation/current protection loop logic
R
12
R
14
C
37
R
13
VSENSE
CL
ST7538
Voltage
Controlled
Signal
Feedback
Signal
VRPK
VCLTH
VCL HYST
ATOP/ATO
VCL HYST
Vout
Iout
C
17
Signal
VCLTH
VCL HYST
1.865 V
VCL HYST
Q
VR
PK
R
14
R
12
+
R
14
----------------------------
VCL
TH
VCL
HIST
±
()
VCL
TH
=190mV
VCL
HIST
=19mV
⇒
⋅
≅
Test
Current
Control
Test
Voltage
Control
Reduce
Gain
Constant
Gain
Iref < IL
Iref > IH
Vref > VH
Vref < VL
Constant
Gain
Reduce
Gain
Increase
Gain
Test
Current
Control
Test
Voltage
Control
Reduce
Gain
Constant
Gain
Iref < IL
Iref > IH
Vref > VH
Vref < VL
Constant
Gain
Reduce
Gain
Increase
Gain



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