Datasheet

Electrical characteristics STM32F401xB STM32F401xC
104/139 DS9716 Rev 11
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 6 6 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.
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
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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)
-3.6
VV
REF+
Positive reference voltage 1.7
(1)
-V
DDA
V
REF-
Negative reference voltage - - 0 -
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
--50κΩ
R
ADC
(2)(4)
Sampling switch resistance - - - 6 κΩ
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