Texas Instruments DM6467 Digital Video Evaluation Module TMDXEVM6467T TMDXEVM6467T 데이터 시트
제품 코드
TMDXEVM6467T
(
)
C C
1
2
CL
C
C
1
2
=
+
AUX_MXI/
AUX_CLKIN
AUX_MXO
C1
C2
Crystal
AUX_V
SS
24 MHz
1.8 V
AUX_DV
DD18
1.3 V
AUX_CV
DD
AUX_DV
SS
SPRS605C – JULY 2009 – REVISED JUNE 2012
Table 7-5. Input Requirements for Crystal on the 27 – 35-MHz System Oscillator
PARAMETER
MIN
NOM
MAX
UNIT
Start-Up Time (from power up until oscillating at stable frequency)
4
ms
Oscillation Frequency
27
33 or 33.3
35
MHz
27 – 31-MHz
50
Ω
ESR
32 – 35-MHz
40
Ω
Parallel Load Capacitance (C1 and C2) [Max]
12 – 20
pF
Frequency Tolerance
± 50
ppm
Aging
± 5
ppm
Thermal Stability
± 50
ppm
Oscillation Mode
Fundamental
n/a
Drive Level (Max)
0.8
mW
Shunt Capacitance (Max)
5
pF
7.4.1.2
24-MHz Auxiliary Oscillator Clock Input Option 1—Crystal
In this option, a crystal is used as the external clock input to the DM6467T auxiliary oscillator.
The 24-MHz oscillator provides the reference clock for USB and UART peripherals and the internal clock
source for the McASP peripherals. The on-chip oscillator requires an external 24-MHz crystal connected
across the AUX_MXI and AUX_MXO pins, along with two load capacitors, as shown in
source for the McASP peripherals. The on-chip oscillator requires an external 24-MHz crystal connected
across the AUX_MXI and AUX_MXO pins, along with two load capacitors, as shown in
. The
external crystal load capacitors must be connected only to the 24-MHz oscillator ground pin (AUX_V
SS
).
Do not connect to board ground (V
SS
). The AUX_DV
DD18
pin can be connected to the same 1.8 V power
supply as DV
DDR2
.
Figure 7-8. 24-MHz Auxiliary Oscillator
The load capacitors, C1 and C2, should be chosen such that the equation is satisfied (for typical values,
see
see
). C
L
in the equation is the load specified by the crystal manufacturer. All discrete
components used to implement the oscillator circuit should be placed as close as possible to the
associated oscillator pins (AUX_MXI and AUX_MXO) and to the AUX_V
associated oscillator pins (AUX_MXI and AUX_MXO) and to the AUX_V
SS
pin.
Table 7-6. Input Requirements for Crystal on the 24-MHz Auxiliary Oscillator
PARAMETER
MIN
NOM
MAX
UNIT
Start-Up Time (from power up until oscillating at stable
4
ms
frequency of 24 MHz)
Oscillation Frequency
24
MHz
ESR
60
Ω
150
Peripheral Information and Electrical Specifications
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