LMX5252_15 Datasheet, PDF (7/41 Pages) Texas Instruments – Bluetooth™ Radio

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LMX5252
SNOSCW4A – DECEMBER 2004 – REVISED APRIL 2013
TRANSMITTER PERFORMANCE CHARACTERISTICS
PARAMETER
CONDITION
P_OUTRF ⁽²⁾
Power Density⁽³⁾
Transmit output power
Power density
2.402 GHz
2.441 GHz
2.480 GHz
MOD ∆F1_AVG
MOD ∆F2_MAX(4)
∆F2_AVG/∆F1_AVG ⁽⁵⁾
Modulation characteristics
20 dB Bandwidth
Data = 00001111
Data = 10101010
ACP ⁽³⁾
Adjacent channel power (In-band spurious)
|M-N|=2
|M-N|≥3
P_OUT2×f_o ⁽⁶⁾
PA 2^nd Harmonic suppression
PO_UT3×f_o ⁽³⁾
Z_RFOUT ⁽⁷⁾
Return Loss⁽³⁾⁽⁸⁾
PA 3^rd Harmonic suppression
RF Output/Input Impedance of RF Port
(RF_inout)
Return Loss
Maximum gain setting:
f₀ = 2402 MHz,
P_out = 4804 MHz
Maximum gain setting:
f₀ = 2402 MHz,
P_out = 7206 MHz
P_out at 2.4 GHz
(1) Typical operating conditions are at V_CC = 2.75V.
(2) The output power is measure at the device interface.
(3) Not tested in production.
(4) ΔF2max > 115 kHz for at least 99.9% of all ΔF2max.
(5) Modulation index set between 0.28 and 0.35.
(6) Out-of-Band spurs only exist at 2^nd and 3^rd harmonics of the CW frequency for each channel.
(7) Reference Table 1.
(8) Reference Table 4.
MIN TYP⁽¹⁾ MAX
–3
+1
+3
–3
+1
+3
–3
+1
+3
–4
1
2
140
165 175
115
125
0.8
1000
–48 –20
–51 –40
–30
UNIT
dBm
dBm
dBm
dBm
kHz
kHz
kHz
dBm
dBm
dBm
–30 dBm
47
Ω
–14
dB
SYNTHESIZER PERFORMANCE CHARACTERISTICS
PARAMETER
CONDITION
f_VCO
t_LOCK
∆f₀offset ^{(1) (2)}
∆f₀drift ^{(1) (2)}
VCO Frequency range
Lock time
Initial carrier frequency tolerance
Initial carrier frequency drift
f₀ ± 50 kHz
During preamble
DH1 data packet
DH3 data packet
DH5 data packet
Drift Rate
t_D -Tx
Transmitter delay time
From Tx data to antenna
MIN TYP MAX
UNIT
5000
MHz
120
µs
–75
0
75
kHz
–25
0
25
kHz
–40
0
40
kHz
–40
0
40
kHz
–20
0
20 kHz/50µs
4
µs
(1) Frequency accuracy is dependent on crystal oscillator chosen. The crystal must have a cumulative accuracy of < ±20ppm to meet
Bluetooth specifications.
(2) Not tested in production.
CRYSTAL REQUIREMENTS
The LMX5252 contains a crystal driver circuit. This circuit operates with an external crystal and capacitors to
form an oscillator. Figure 1 shows the recommended crystal circuit. Figure 3 specifies system clock
requirements.
The RF local oscillator and internal digital clocks for the LMX5252 is derived from the reference clock at the
CLK+ input. This reference may either come from an external clock or a dedicated crystal oscillator. The crystal
oscillator connections require an Xtal and two grounded capacitors.Ÿ
Copyright © 2004–2013, Texas Instruments Incorporated
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