Texas Instruments 3138 155 232931 - Manual (Page 12)

CC2420
SWRS041B Page 12 of 89
Parameter Min. Typ. Max. Unit Condition / Note
Crystal load capacitance 12 16 20 pF 16 pF recommended
Crystal ESR 60 Ω
Crystal oscillator start-up time 1.0 ms 16 pF load
Phase noise
−109
−117
−117
−117 dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
Unmodulated carrier
At ±1 MHz offset from carrier
At ±2 MHz offset from carrier
At ±3 MHz offset from carrier
At ±5 MHz offset from carrier
PLL loop bandwidth 100 kHz
PLL lock time 192 µs The startup time from the crystal
oscillator is running and RX / TX
turnaround time
6.7 Digital Inputs/Outputs
Parameter Min. Typ. Max. Unit Condition / Note
General Signal levels are referred to the
voltage level at pin DVDD3.3
Logic "0" input voltage 0 0.3*
DVDD
V
Logic "1" input voltage 0.7*
DVDD DVDD V
Logic "0" output voltage 0 0.4 V Output current −8 mA,
3.3 V supply voltage
Logic "1" output voltage 2.5 VDD V Output current 8 mA,
3.3 V supply voltage
Logic "0" input current NA −1 µA Input signal equals GND
Logic "1" input current NA 1 µA Input signal equals VDD
FIFO setup time 20 ns TX unbuffered mode, minimum
time FIFO must be ready before
the positive edge of FIFOP
FIFO hold time 10 ns TX unbuffered mode, minimum
time FIFO must be held after the
positive edge of FIFOP
Serial interface pins (SCLK, SI, SO
and CSn) timing specification See Table 4 on page 28