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PDF SA1787 Data sheet ( Hoja de datos )
| Número de pieza | SA1787 | |
| Descripción | SINGLE-CHIP TUNER IC | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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SINGLE-CHIP TUNER IC FOR CAR RADIOS
SA1787
DESCRIPTION
The SA1787 is a high performance tuner circuit for AM and FM car
radio. It integrates mixer, IF amplifier, signal detection circuit and
stereo decoder for AM and FM. It achieves stereo tuning with
advanced technology and less peripheral components.
FEATURES
FM-Part
∗ RF AGC generation for RF and IF detection
∗ I/Q mixer for 1st FM IF 10.7MHz with image rejection
∗ Excellent FM signal meter linearity
∗ MPX integrated in a single chip
∗ Improve FM separation temperature characteristics
∗ Improve FM thermal characteristics
AM-Part
∗ Wide and narrow AGC generation
∗ Mixer for 1st IF 10.7MHz, AM up conversion
∗ Mixer for 2nd IF 450kHz, AM down conversion
∗ Integrated AM-demodulator
∗ AM IF and audio noise blanking
∗ Improve AM adjacent channel interference characteristics
∗ Improve AM thermal characteristics
QFP-64-14 x 14-0.8
APPLICATIONS
∗ Car Radios
ORDERING INFORMATION
www.DataSheet4U.com
Device
Package
SA1787
QFP-64-14x14-0.8
Marking
SA1787
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 1 of 19
1 page  
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
A.V 83 MHz, 80 dBµ, unmodulated. output at
The FE CF
Oscillator Buffer Output 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
SN-NC
The pulse rejection effect provided by the
noise canceller.
For a repeated 1-µs pulse, frequency =
10 kHz, 150 mV p-o. The ratio of outputs
at pin 15 in FM mode and in AM mode
(effective value)
5
[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
[AM Characteristics] AM ANT Input
10 15 20 mVrms
Practical Sensitivity
S/N-30
1 MHz, 30 dBµ, fm = 1 kHz, 30%
modulation, pin 15
20
dB
www.DataShDeeett4eUc.tcoormOutput
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
S/N-AM
Total Harmonic Distortion THD-AM
Signal Meter Output
Oscillator Buffer Output
VSM AM-1
VSM AM-2
VOSCBUFF
1 MHz, 74 dBµ, fm = 1 kHz, 30%
modulation
1 MHz, 74 dBµ, fm = 1 kHz, 80%
modulation
No input
1 MHz, 130 dBµ, unmodulated
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
Page 5 of 19
5 Page 
FUNCTION DESCRIPTION
1. FM Front End
Oscillator
Figure 1 shows the type of oscillator circuit used in this IC.
Figure 1
Figure 2 shows the type of FM first IF amplifier used in this IC.
Input impedance: 330 Ω
Output impedance: 330Ω
Gain: 20 dB
Figure 2
2. FM IF
www.DataShFeigeut4rUe.3cosmhows an overview of the FM SD and the IF count buffer.
SA1787
Figure 3
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 11 of 19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SA1787.PDF ] | |
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