Datasheet

ST7540 Functional description
29/44
Note: Notes: The rate of R2 takes in account the input resistance on the V
SENSE
pin (36K Ω ). 10nF
capacitor effect has been neglected.
Figure 18. Typical output current vs RCL
● Integrated Power Line Interface (PLI)
The Power Amplifier (PA) is a CMOS AB Class Power Amplifier. The PA requires, to
ensure a proper
operation, a regulated and well filtered Supply Voltage. Vcc Voltage and PA_OUT
Voltage must fulfil
the following formulas to work without clipping phenomena:
Table 11. V
OUT
Vs. R1 & R2 resistors value
Vout (Vrms) Vout (dBµV) (R1+R2)/R2 R2 (KΩ) R1 (KΩ)
0.150 103.5 1.1 7.5 1.0
0.250 108.0 1.9 5.1 3.9
0.350 110.9 2.7 3.6 5.6
0.500 114.0 3.7 3.3 8.2
0.625 115.9 4.7 3.3 11.0
0.750 117.5 5.8 2.7 12.0
0.875 118.8 6.6 2.0 11.0
1.000 120.0 7.6 1.6 10.0
1.250 121.9 9.5 1.6 13.0
1.500 123.5 10.8 1.6 15.0
Irms
(mA)
Rcl(kΩ)
D01IN1311
120
220
320
420
520
620
720
820
920
1020
1120
1220
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1
V
CC
VPAOUT AC()
2
---------------------------------------- VPOUT DC()3V++≥
VPOUT DC()
VPAOUT AC()
2
----------------------------------------
1.5V≥–