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參數資料
型號： TPS65950ZXNT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝： 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數： 43/167頁
文件大?。?/td> 2566K
代理商： TPS65950ZXNT
C
C
O
L
ESR
R
=
1+
m
2
32KX
OC0
OC1
032-067
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Table 12-4. Crystal Electrical Characteristics (continued)
Parameter
Min(1)
Typ(2)
Max(3)
Unit
Nominal load cap on each oscillator input CXIN and CXOUT(4)
CXIN = CXOUT = Cosc*2 – (Cint +
pF
Cpin)
Pin-to-pin capacitance
1.6
1.8
pF
Crystal ESR(5)
75
k
Crystal shunt capacitance, CO
1
pF
Crystal tolerance at room temperature, 25
°C
–30
30
ppm
Crystal tolerance versus temperature range (–40
°C to 85°C)
–200
200
ppm
Maximum drive power
1
W
Operating drive level
0.5
W
(4)
Nominal load capacitor on each oscillator input defined as CXIN = CXOUT = Cosc*2 – (Cint + Cpin). Cosc is the load capacitor defined
in the crystal oscillator specification, Cint is the internal capacitor, and Cpin is the parallel input capacitor.
(5)
The crystal motional resistance Rm relates to the equivalent series resistance (ESR) by the following formula:
Measured with the load capacitance specified by the crystal manufacturer. If CXIN = CXOUT = 10 pF, then CL = 5 pF. Parasitic
capacitance from the package and board must also be considered.
When selecting a crystal, the system design must consider the temperature and aging characteristics of a
crystal versus the user environment and expected lifetime of the system.
Table 12-5 and Table 12-6 list the switching characteristics of the oscillator and the input requirements of
the 32.768-kHz input clock, respectively. Figure 12-6 shows the crystal oscillator output in normal mode.
Table 12-5. Base Oscillator Switching Characteristics
Name
Parameter Description
Min(1)
Typ(2) Max(3)
Unit
fP
Oscillation frequency
32.768
kHz
tSX
Startup time
0.5
s
LOJIT <1:0> = 00
1.8
IDDA
Active current consumption
A
LOJIT <1:0> = 11
8
Low battery mode (1.2 V)
1
IDDQ
Current consumption
A
Startup
8
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Min = Minimum value
Table 12-6. 32-kHz Crystal Input Clock Timing Requirements
Name
Parameter Description
Min(1)
Typ(2)
Max(3)
Unit
OC0
1/tC(32KHZ)
Frequency, 32 kHz
32.768
kHz
OC1
tW(32KHZ)
Pulse duration, 32 kHz low or high
0.40*tC(32KHZ)
0.60*tC(32KHZ)
s
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
Figure 12-6. 32-kHz Crystal Input
Clock Specifications
137
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