SA58646 Datasheet, PDF (32/42 Pages) NXP Semiconductors – UHF 900 MHz transceiver IC

NXP Semiconductors
SA58646
UHF 900 MHz transceiver IC
Table 29. RX baseband …continued
V_CC = 3.3 V; T_amb = 25 °C; see Figure 6.
V_VB = 1.5 V; f_i = 1 kHz; RX gain set for 0 dB gain at −20 dBV on pin RXAI; earpiece volume at +4.7 dB; 560 pF between pins
EARI and EARO; 150 Ω in series with 10 µF on pin EARO; all measured with a ITU-T filter except THD; unless otherwise
specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
∆G_expdr
expander gain change
referenced to V_RXAI = −20 dBV with ^[2]
RX baseband audio noise tuning
t_att(expdr)
expander attack time
t_rel(expdr)
expander release time
α_{ct(compr-expdr)} compressor to expander
crosstalk attenuation
V_o(max)
maximum output voltage
Earpiece amplifier
V_RXAI = −30 dBV
V_RXAI = −35 dBV
V_RXAI = −45 dBV
C_ECAP = 0.47 µF
C_ECAP = 0.47 µF
from pins CMPI to EARO;
V_CMPI = −20 dBV;
V_RXAI = 0 V (RMS)
indicative value; THD < 4 %
−24 −20 −18
dB
−37 −30 −26
dB
-
−47 −45
dB
-
2.0 -
ms
-
5.0 -
ms
-
80
-
dB
-
−7
-
dBV
G_ctrl(dyn)
G_ctrl
dynamic gain control
gain control
no external resistor or capacitor
used
13
14
15
dB
EARP_VOL[1:0] = 00
−1
0
+1
dB
EARP_VOL[1:0] = 01
3.7 4.7 5.7
dB
EARP_VOL[1:0] = 10
8.3 9.3 10.3 dB
EARP_VOL[1:0] = 11
13
14
15
dB
Output: pin EARO
V_o(p-p)
R_L
peak-to-peak output voltage
load resistance
THD < 4 %
to keep amplifier stability; R_L in
series with 10 µF
-
2.2 -
V
-
150 100000 Ω
[1] Pin RXAI level will be higher in RX mode than in TX mode.
[2] With expander output noise level control tuned for −65 dBV (max) and maximum gain tolerance of −4 dB at −35 dBV. With a larger gain
tolerance at −35 dBV, the typical output noise can be reduced by 10 dB. See application note.
Table 30. TX baseband
V_CC = 3.3 V; T_amb = 25 °C; see Figure 8.
V_VB = 1.5 V; f_i = 1 kHz; TX gain set for +10 dB gain at −30 dBV on pin CMPI; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
Microphone amplifier
G
gain
0
-
34
dB
Output: pin MICO
V_o(max)
maximum output voltage
Input: pin CMPI
R_L = 10 kΩ; THD < 0.2 %
−12 -
-
dBV
Z_i
input impedance
Compressor
-
15
-
kΩ
G
gain
V_CMPI = −30 dBV; ALC off;
hard limiter enabled
9
10
11
dB
SA58646_1
Product data sheet
Rev. 01 — 8 February 2007
© NXP B.V. 2007. All rights reserved.
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