SA1787 Datasheet, PDF (5/19 Pages) Silan Microelectronics Joint-stock – SINGLE-CHIP TUNER IC FOR CAR RADIOS

SA1787
Characteristics
Symbol
Test conditions
Min. Typ. Max. Unit
W-AGC on Input
VWAGC
83 MHz, unmodulated. The input such
that the pin 2 voltage is 2.0 V or below.
(When the keyed AGC is set to 4.0 V.)
104 110 116 dBµ
Conversion Gain
Oscillator Buffer Output
83 MHz, 80 dBµ, unmodulated. output at
A.V
The FE CF
VOSCBUFFF No input
[NC Block] NC Input (Pin 30)
Gate Time
　τGATE1 f = 1 kHz, for a 1-µs, 100-mV p-o pulse
19 30 48 mVrms
85 110 165 mVrms
55
µs
Noise Sensitivity
The level of a 1 kHz, 1-µs pulse input that
SN
starts noise canceller operation.
Measured at pin 30.
40
mVp-o
NC Effect
The pulse rejection effect provided by the
noise canceller.
For a repeated 1-µs pulse, frequency =
SN-NC
5
10 kHz, 150 mV p-o. The ratio of outputs
at pin 15 in FM mode and in AM mode
(effective value)
[Multipath Rejection Circuit] MRC Input (Pin 27)
MRC Output
VMRC V24 = 5 V
2.2 2.3 2.4 V
MRC Operating Level
The pin 32 input level at f = 70 kHz,
MRC-ON
voltage at pin 24 is 5V and pin 27 is 2V
10 15 20 mVrms
[AM Characteristics] AM ANT Input
1 MHz, 30 dBµ, fm = 1 kHz, 30%
Practical Sensitivity
S/N-30
20
dB
modulation, pin 15
Detector Output
VO-AM
1 MHz, 74 dBµ, fm = 1 kHz, 30%
modulation, pin 15
130 195 270 mVrms
Pin 31 Detector Output
1 MHz, 74 dBµ, fm = 1 kHz, 30%
VO-AM31
modulation, pin 31
110 175 230 mVms
Agc F.O.M.
1 MHz, 74 dBµ, referenced to the output,
the input amplitude such that the output
VAGC-FOM
falls by 10 dB. Pin 15
51 56 61 dB
Signal-To-Noise Ratio
1 MHz, 74 dBµ, fm = 1 kHz, 30%
S/N-AM
modulation
1 MHz, 74 dBµ, fm = 1 kHz, 80%
Total Harmonic Distortion THD-AM
modulation
Signal Meter Output
VSM AM-1 No input
VSM AM-2 1 MHz, 130 dBµ, unmodulated
Oscillator Buffer Output VOSCBUFF No input
47 52
dB
0.3 1
%
0.0 0.4 0.7 V
4.8 6 7.3 V
185 230
mVrms
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
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