PEF 24470 H V1.3 Infineon Technologies, PEF 24470 H V1.3 Datasheet - Page 32
PEF 24470 H V1.3
Manufacturer Part Number
PEF 24470 H V1.3
Description
IC MTSI-XL SWITCHING MQFP100
Manufacturer
Infineon Technologies
Series
SWITIr
Datasheet
1.PEF_20450_H_V1.3.pdf
(129 pages)
Specifications of PEF 24470 H V1.3
Function
Switching IC
Interface
PCM, PLL
Number Of Circuits
1
Voltage - Supply
3.13 V ~ 3.47 V
Current - Supply
200mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
100-SQFP
Includes
Clock Shift, Data Rate Adaption, Multipoint Switching
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
Other names
PEF24470HV1.3X
SP000007617
SP000007617
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PRELIMINARY
3.4.2.1
Figure 7
The value of the output frequency depends of the programming of the n-divider. The
chosen output frequency for the SWITI is 49.152 MHz and the input frequency is
2.048 MHz.
The macro consists of a digital and an analog PLL which are working together. During
start-up only the digital one is enabled and makes a coarse adjustment, so that the
technology dependency of the circuit is compensated. Afterwards the digital PLL is
disabled again and the analog one is switched on for normal operation.
The digital PLL is of first order and consists of a frequency detector (FD), an up/down
counter, a digital-to-analog converter (DAC) and a current controlled oscillator (CCO).
The FD detects any frequency difference between the reference clock (fref: input clock
fin = 2.048 MHz) and the divided oscillator clock. The output signal controls the counter.
If the reference frequency is higher than the divided oscillator frequency the counter is
increased. The counter output drives a current steering DAC which controls the input
current of the internal oscillator. Its current rises and the output frequency increases until
both frequencies are equal.
Preliminary Data Sheet
fin
Functional Description
fref
fref
Block Diagram of APLL
frequency
frequency
detector
detector
phase/
Timer
up/down
incr
decr
UP/DOWN
Counter
Charge
pump
n-divider
23
ibias
cw
VTOI
DAC
PEF 20450 / 20470 / 24470
iprop
igrob
iint
Architectural Description
iref
reference
current
CCO
2001-11-20
fosc
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