Datasheet

Electrical characteristics ST7540
10/44
V
OH
High logic level output
voltage
I
OH
= -2mA
V
DD
-
0.75
V
V
OL
Low logic level output
voltage
I
OL
= 2mA
GND
+ 0.4
V
Oscillator
External Clock X2 voltage swing External clock. Figure 4 5
V
pp
External Clock
X2 DC voltage level External clock. Figure 4 2.5 V
DC XTAL Clock duty cycle External clock. 40 60 %
Xtal
Crystal oscillator
frequency
fundamental 16 MHz
Xtal
ESR
External oscillator esr
resistance
40 Ω
Xtal
CL
External oscillator
stabilization
capacitance
Figure 6 16 pF
Transmitter
I
TX_OUT
Output transmitting
current on TX_OUT
1mArms
V
TX_OUT
Max carrier output AC
voltage
R
CL
= 1.4kΩ
Vsense = 0V
1.75 2.3 3.5
V
PP
V
TX_OUTDC
Output DC voltage on
TX_OUT
1.7 2.1 2.5 V
HD2
TX_OUT
Second harmonic
distortion on TX_OUT
V
TX_OUT
= 2V
PP
;
Fc = 86KHz, no load
-42
dB
c
HD3
TX_OUT
Third harmonic
distortion on TX_OUT
V
TX_OUT
= 2V
PP
;
Fc = 86KHz, no load
-49
dB
c
G accuracy
Accuracy on voltage
control loop active
R
CL
= 0Ω
-1 +1 GST
G
ST
ALC gain step control
loop gain step
0.6 1 1.4 dB
DRNG ALC dynamic range 30 dB
C
CL
Input capacitance on
CL pin
80 pF
V
senseTH
Voltage control loop
reference threshold on
V
sense
pin
Figure 17 160 180 200
mV
PK
V
senseHYST
Hysteresis on voltage
loop reference
threshold
Figure 17 ±18 mV
Table 5. Electrical characteristics (continued)
( V
DD
= +5V, V
CC
=+9 V, V
SS
= S V
SS
= GND = 0V,-40°C ≤ T
A
≤ 85°C, T
J
< 125°C,
unless otherwise specified)
Symbol Parameter Test condition Min. Typ. Max. Unit