參數(shù)資料
型號： SAA8200HL
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Ensation Base integrated wireless audio baseband
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100
文件頁數(shù)： 50/71頁
文件大?。?/td> 298K
代理商： SAA8200HL
SAA8200HL_2
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 02 — 17 October 2005
50 of 71
Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
The digital part of the controller consists of a state machine that enables the controller to
switch modes. A decision to jump to a different state is taken on the basis of the outputs of
the analog part. As a result of some of the jumps, the duration of the first phase of the
cycle is increased or decreased, see
Figure 20
.
7.21.2
Linear regulators
The linear regulators will be implemented as Low Drop voltage Output (LDO) regulators
for a fixed output voltage, see
Figure 21
. One LDO has to handle input signals in the order
of 5.0 V so a special construction with thick gate oxide is needed. The other LDO handles
an input signal of 3.3 V thus a normal construction with thick gate oxide is sufficient. For
the loop stability the choice is made that the dominant pole lies externally. The series
resistance of Cext (ESR) gives a zero and degrades the stability and thus limited to a
maximum value. For an accurate output voltage a reference voltage is needed. This
voltage can be made with a band gap circuit. A fraction of the output voltage is fed back to
the operation amplifier. In Stop mode the LDOs should be stable to deliver only small
currents.
The controller will be in discontinuous mode if adjusted DCDC_OUT1V8
≤
V
BAT(DCDC)
.
No forward diode from V
BAT(DCDC)
to DCDC_OUT1V8 allowed.
Fig 20. Digital part of the controller
001aac008
sample
VTH
dec. t1
VTH
DISCONTINUOUS
MODE
VTH
sample
VTL AND VTH
CONTINUOUS
MODE
VTL
VTL
sample
VTL
inc. t1
RAMP-UP
MODE
inc. t1
The on terminal is connected to VUSB_PRESENT.
Fig 21. Principle of LDO
001aac009
self-biased
operational amplifier
Cext
capacitor
V
SS
V
SS(clean)
DCDC_OUT
PCB
star ground
ESR
VIN
ON
EF
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