Si4770/77-A20
Signal Generator
50 ?
FMXIP
FMXIN
Si477x
Figure 5. FM Test Circuit for Mixer Input IP3 and Sensitivity Measurement
Table 8. AM Receiver Characteristics
(T AMB = –40 to 85 °C, V A = 4.5 to 5.5 V, V D = 2.7 to 3.6 V, V IO1 = 1.7 to 3.6 V, V IO2 = 1.2 to 3.6 V. Typical values measured at
T AMB = 25 °C, AM modulation = 30%, F MOD = 1 kHz, RF level = 74 dBμV, and F RF = 1 MHz unless otherwise specified)
Parameter
Input Frequency
Frequency Step
Test Condition
Min
520
1
Typ
Max
1710
10
Unit
kHz
kHz
Resolution
Powerup Time 1,2
RCLK or Crystal = 36.4 MHz, 37.8 MHz,
100
ms
37.209375 MHz
Tune Time 1
15
ms
Seek Time/Channel 1
Maximum RF Input
Voltage 1,2
Image Rejection 1,3
Adjacent Channel
Rejection 1,3
Alternate Channel
Rejection 1,3
IP3 1,3
At LOUT and ROUT pins
Mod = 90%, Fmod = 1 kHz, SINAD = 57 dB
SINAD = 20 dB
Desired = 40 dBμV, F MOD = 1 kHz, MOD = 30%
Undesired at ±9 kHz offset, F MOD = 400 Hz,
MOD = 30%
SINAD = 20 dB
Desired = 40dBμV, F MOD = 1 kHz, MOD = 30%
Undesired at ±18 kHz offset, F MOD = 400 Hz,
MOD = 30%
Blockers at 40/80 kHz, AGC disabled (Max gain)
68
57
59
110
55
93
72
62
62
120
ms
dBμV
dB
dB
dB
dBμV
Notes:
1. Guaranteed by characterization.
2. Measured at T AMB = 25 °C.
3. No A-weighting. Noise integrated from 30 Hz to 15 kHz for audio SINAD and SNR measurements.
4. Guaranteed by design.
Rev. 0.9
17
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