SA58646 Datasheet, PDF (30/42 Pages) NXP Semiconductors – UHF 900 MHz transceiver IC

NXP Semiconductors
SA58646
UHF 900 MHz transceiver IC
Table 27. Transmitter part …continued
V_CC = 3.3 V; T_amb = 25 °C; unless otherwise specified.
Symbol
Parameter
Conditions
ϕ_n
phase noise
VCO TX plus PA; output power at
0 dB
Q_min
minimum quality factor
Power amplifier
f_offset = 20 MHz
f_offset = 10 kHz
f_offset = 1 kHz
external inductor quality factor at
902 MHz to 928 MHz; L_ext = 3.9 nH
P_o
output power
subtract duplexer insertion loss to
get power on antenna; see Table 20
∆P_o
N_{step(G_adj)}
output power variation
number of gain adjustment
steps
see Table 20
software control
Transmit system
THD
total harmonic distortion
measured after demodulation;
V_MODO for demodulated
∆f = ±60 kHz; measured with ITU-T
filter
P_sp
spurious output power
RX VCO spurious emission on PA
output versus output power
Min
[2]
−139
-
-
30
[3] _-
[3] _-
-
-
[1] _-
Typ
−150
−85
−60
-
3
2
4
1
−45
Max
-
-
-
-
-
-
-
2
-
Unit
dBc/Hz
dBc/Hz
dBc/Hz
dBm
dB
%
dBc
[1] This specification will be measured and guaranteed only on the NXP Semiconductors SA58646 board.
[2] TX-to-RX duplexer isolation = 35 dB; carrier = 925.6 MHz; L_ext = 3.9 nH (for both base and handset); loop filter: C1 = 470 nF,
R2 = 1.8 kΩ and C2 = 4.7 µF (see application note).
[3] Load: R = 50 Ω; L_p = 22 nH; C_s = 1.6 pF.
Table 28. Synthesizer
V_CC = 3.3 V; T_amb = 25 °C; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ
Crystal oscillator; external capacitors on pins XTALO = 8.2 pF and XTALI = 5.6 pF (indicative)
f_xtal
C_i(XTALI)
crystal frequency
input capacitance on pin
XTALI
reference input frequency
indicative; XTAL_TUN[3:0] = 8
4
10.24
-
4
C_i(XTALO)
input capacitance on pin
XTALO
indicative
-
1.5
C_tune(xtal)
N_{step(C_tune)}
crystal tuning capacitance on pin XTALI
number of tuning capacitance XTAL_TUN[3:0]
steps
-
4.5
-
16
Clock divider
D/D_clk
t_sw
clock divider ratio
switching time
CLK_DIV[2:0]
from one frequency f1 to frequency
f2
1
-
-
2 / f2
Output: pin CLKO
C_L
load capacitance
external load
-
-
Max
20
-
-
-
-
128
-
20
Unit
MHz
pF
pF
pF
s
pF
SA58646_1
Product data sheet
Rev. 01 — 8 February 2007
© NXP B.V. 2007. All rights reserved.
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