- Silicon Laboratories, Inc. Radio User Manual

Si4734/35-B20
14 Rev. 1.0
Table 10. 64–75.9 MHz Input Frequency FM Receiver Characteristics
1
(V
DD
= 2.7 to 5.5 V, V
IO
= 1.5 to 3.6 V, T
A
= –20 to 85 °C)
Parameter Symbol Test Condition Min Typ Max Unit
Input Frequency f
RF
64 — 75.9 MHz
Sensitivity with Headphone
Network
2,3,4,5
(S+N)/N = 26 dB — 4.0 — µV EMF
LNA Input Resistance
5,6
345kΩ
LNA Input Capacitance
5,6
456pF
Input IP3
5,7
100 105 — dBµV EMF
AM Suppression
2,3,5,6
m = 0.3 40 50 — dB
Adjacent Channel Selectivity
5
±200 kHz — 50 — dB
Alternate Channel Selectivity
5
±400 kHz — 70 — dB
Audio Output Voltage
2,3,5,6
72 80 90 mV
RMS
Audio Output L/R Imbalance
2,6,8
—— 1 dB
Audio Frequency Response Low
5
–3 dB — — 30 Hz
Audio Frequency Response High
5
–3 dB 15 — — kHz
Audio Mono S/N
2,3,4,5,6,9
55 63 — dB
Audio THD
2,5,6,8
—0.10.5 %
De-emphasis Time Constant FM_DEEMPHASIS = 2 70 75 80 µs
FM_DEEMPHASIS = 1 45 50 54 µs
Audio Common Mode Voltage
9
0.7 0.8 0.9 V
Audio Output Load Resistance
5,9
R
L
Single-ended 10 — — kΩ
Audio Output Load Capacitance
5,9
C
L
Single-ended — — 50 pF
Seek/Tune Time
5
RCLK tolerance
=100ppm
— — 80 ms/channel
Powerup Time From powerdown — — 110 ms
RSSI Offset
10
Input levels of 8 and
60 dBµV EMF
–3 — 3 dB
Notes:
1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal
Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers. Tested at
RF = 98.1 MHz.
2. F
MOD
= 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.
3. Δf = 22.5 kHz.
4. B
AF
= 300 Hz to 15 kHz, A-weighted.
5. Guaranteed by characterization.
6. V
EMF
= 1 mV.
7. |f
2
– f
1
| > 2 MHz, f
0
= 2 x f
1
– f
2
. AGC is disabled. Refer to "6. Pin Descriptions: Si4734/35-GM" on page 30.
8. Δf = 75 kHz.
9. At LOUT and ROUT pins.
10. At temperature 25 °C.