TDK5101XT Infineon Technologies, TDK5101XT Datasheet - Page 14

• Manufacturer Part Number: TDK5101XT
• Manufacturer: Infineon Technologies

Specifications of TDK5101XT

• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Depth (mm): 4.4mm
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Lead Free Status / Rohs Status: Compliant

Wireless Components
3.4 Functional Blocks
3.4.1 PLL Synthesizer
The Phase Locked Loop synthesizer consists of a Voltage Controlled Oscillator
(VCO), an asynchronous divider chain, a phase detector, a charge pump and a
loop filter. It is fully implemented on chip. The tuning circuit of the VCO consist-
ing of spiral inductors and varactor diodes is on chip, too. Therefore no addi-
tional external components are necessary. The nominal center frequency of the
VCO is 630 MHz. The oscillator signal is fed both, to the synthesizer divider
chain and to the power amplifier. The overall division ratio of the asynchronous
divider chain is 64. The phase detector is a Type IV PD with charge pump. The
passive loop filter is realized on chip. In all 315 MHz applications, the FSEL pin
is shorted to ground (logic low) and the CSEL pin is not connected (logic high).
3.4.2 Crystal Oscillator
The crystal oscillator operates at 9.84 MHz. Frequencies of 615 kHz or 2.46
MHz are available at the clock output CLKOUT (pin 8) to drive the clock input
of a micro controller.
The frequency at CLKOUT (pin 8) is controlled by the signal at CLKDIV (pin 9)
To achieve FSK transmission, the oscillator frequency can be detuned by a
fixed amount by switching an external capacitor via FSKOUT (pin 11).
The condition of the switch is controlled by the signal at FSKDTA (pin 7).
Table 3-3
Table 3-4
1) Low:
2) Open:
1) Low:
2) Open:
3) High:
CLKDIV (pin 9)
FSKDTA (pin7)
Open
Open
Low
Low
Voltage at pin < 0.2 V
Pin open
Voltage at pin < 0.5 V
Pin open
Voltage at pin > 1.5 V
2)
, High
1)
1)
2)
3 - 8
3)
CLKOUT Frequency
FSK Switch
Specification, October 2002
Functional Description
2.46 MHz
CLOSED
615 kHz
OPEN
TDK 5101