PEF 24470 H V1.3 Infineon Technologies, PEF 24470 H V1.3 Datasheet - Page 32

• Manufacturer Part Number: PEF 24470 H V1.3
• Description: IC MTSI-XL SWITCHING MQFP100
• Manufacturer: Infineon Technologies
• Series: SWITIr

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

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