Datasheet

Electrical characteristics STM32F401xD STM32F401xE
106/135
Figure 39. USB OTG FS timings: definition of data signal rise and fall time
6.3.20 12-bit ADC characteristics
Unless otherwise specified, the parameters given in Table 66 are derived from tests
performed under the ambient temperature, f
PCLK2
frequency and V
DDA
supply voltage
conditions summarized in Table 14.
Table 65. USB OTG FS electrical characteristics
(1)
1. Guaranteed by design, not tested in production.
Driver characteristics
Symbol Parameter Conditions Min Max Unit
t
r
Rise time
(2)
2.
Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
C
L
= 50 pF 420ns
t
f
Fall time
(2)
C
L
= 50 pF 4 20 ns
t
rfm
Rise/ fall time matching t
r
/t
f
90 110 %
V
CRS
Output signal crossover voltage 1.3 2.0 V
ai14137
t
f
Differen tial
Data L ines
V
SS
V
CR S
t
r
Crossover
points
Table 66. ADC characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
DDA
Power supply
V
DDA
− V
REF+
< 1.2 V
1.7
(1)
-3.6V
V
REF+
Positive reference voltage 1.7
(1)
-V
DDA
V
f
ADC
ADC clock frequency
V
DDA
= 1.7
(1)
to 2.4 V 0.6 15 18 MHz
V
DDA
= 2.4 to 3.6 V 0.6 30 36 MHz
f
TRIG
(2)
External trigger frequency
f
ADC
= 30 MHz,
12-bit resolution
- - 1764 kHz
--171/f
ADC
V
AIN
Conversion voltage range
(3)
0 (V
SSA
or V
REF-
tied to ground)
-V
REF+
V
R
AIN
(2)
External input impedance
See Equation 1 for
details
--50kΩ
R
ADC
(2)(4)
Sampling switch resistance - - 6 kΩ
C
ADC
(2)
Internal sample and hold
capacitor
-47pF
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