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U3550BM Datasheet, PDF (9/25 Pages) TEMIC Semiconductors – Low-Power FM Transmitter / Synthesizer System 26 to 50 MHz
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U3550BM
Absolute Maximum Ratings
Parameters
Supply voltage
Junction temperature
Ambient temperature
Storage temperature
Power dissipation Tamb = 60°C
SO28
Symbol
Min.
Max.
Unit
VS
5.5
V
Tj
+125
°C
Tamb
–25
+75
°C
Tstg
–50
+125
°C
Ptot
520
mW
Thermal Resistance
Junction ambient
Parameters
SO28
Symbol
RthJA
Value
120
Unit
K/W
Electrical Characteristics
Tamb = +25°C; VS = VBAT = MIXVB = RFOVB = DELVB = VCC = OSCVDD; VS = 3.6 V; fMIXIN = 26.40 MHz, fdev = ±2.5 kHz;
VMIXIN = 2.24 mVrms; fRFO = 41.4 MHz; (Fh8) fMODIN = 1.0 kHz; VMODIN = 0.5 Vrms; Voffset = 1.5 V; VMCKA = VCC;
all blocks disabled (ETXO = EVCO1 = EVCO2 = EVCO3 = 0); unless otherwise specified. Test circuit see figure 8.
Parameters
Power supply
Operating voltage range
Operating current
in active mode (1)
Operating current
in standby mode,
oscillator off (1)
Operating current
in standby mode,
oscillator on
Operating current in RX mode
Operating current in active mode
without TX output
Operating current in active mode
RF transmitter
MODIN input impedance
RFO output impedance
RFO output-voltage level
Lowest operating frequency
Highest operation frequency
TX conversion gain
RFO – MODIN
Demodulated distortion THD
Residual modulation (4) on
demodulated signal
Test Conditions / Pins
VBAT = MIXVB = RFOVB = DELVB =
2.9 V
OSCVDD = VCC = 0 V
VBAT = MIXVB = RFOVB = DELVB =
VCC = OSCVDD = 3.6 V,
VMCKA = 0 V, EOSC = 0
VBAT = MIXVB = RFOVB = DELVB =
VCC = OSCVDD = 3.6 V,
VMCKA = 3.6 V, EOSC = 1
EVCO3 = 1
EVCO1 = EVCO2 = 1
ETXO = 1, no load at RFO
Load = 200
ETXO = 0; no load
France base channel 1 (Fb1) (2)
USA base channel 9 (US1b9) (2)
Eb1: fRFO = 31.025 MHz
US1h9: fRFO = 49.99 MHz
Fh6: fRFO = 41.4375 MHz
for VS = 3.1 to 5.2 V
Eb1: Df = 5.0 kHz
Fh9: Df = 1.5 kHz
for VS = 3.1 to 5.2 V
THD measurement with psophometric
filter
Symbol
Min.
Typ.
Max.
3.1
3.6
5.2
5
200
700
5
6
12
14
16
70
100
130
300
390
0.3
26.3125
49.9900
5.7
3.42
2.85
2
Unit
V
mA
mA
mA
mA
mA
mA
kW
W
V
MHz
MHz
kHz/V
kHz/V
kHz/V
%
dB
Rev. A2, 10-Sep-98
9 (25)
Preliminary Information
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