SA1787
SINGLE-CHIP TUNER IC FOR CAR RADIOS
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
QFP-64-14 x 14-0.8
APPLICATIONS
∗
Car Radios
∗
Improve AM thermal characteristics
ORDERING INFORMATION
Device
SA1787
Package
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
SA1787
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics
Maximum Supply Voltage
Allowable Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
CC1
max
V
CC2
max
Pd max
T
opr
T
stg
Conditions
Pins 6, 40, and 61
Pins 7, 45, 54, 59, and 60
Ta
≤
55°C
Ratings
9
12
950
–40 to +85
–40 to +150
Unit
V
V
mW
°C
°C
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 2 of 19
SA1787
OPERATING CONDITIONS
Characteristics
Recommended Supply Voltage
Operating Supply Voltage Range
Symbol
V
CC
V
CC
ST IND
V
CC
op
Conditions
Pins 6, 7, 40, 45, 54, 59,
60, and 61
(Pin 26)
Ratings
8
5
7.5 to 9.0
Unit
V
V
V
ELECTRICAL CHARACTERISTICS
(Special for FM IF input test, Ta = 25°C, V
CC
= 8.0V)
Characteristics
Symbol
Test conditions
Min.
Typ.
Max.
Unit
[FM Characteristics] At The FM IF Input
Current Drain
Demodulation Output
Pin 31 Demodulation
Output
Channel Balance
Total Harmonic Distortion
I
CCO
-FM
V
O-
FM
No input, I40 + I45 + I54 + I59 + I60 + I61
10.7 MHz, 100dBµ, 1 kHz, 100%mod,
output at pin 15
10.7 MHz, 100dBµ, 1 kHz, 100%mod,
output at pin 31
The ratio of pins 15 and 16 at 10.7 MHz,
100 dBµ, 1 kHz
10.7 MHz, 100 dBµ, 1 kHz, 100% mod,
pin 15
10.7 MHz, 100 dBµ, 1 kHz, 100% mod,
pin 15
10.7 MHz, 100 dBµ, 1 kHz, fm = 1 kHz,
30% AM, pin 15
10.7 MHz, 100 dBµ, 1 kHz. Attenuation at
pin 15 when V33 changes from 0 to 2 V
77
57
70
230
105
340
120
mA
420 mVrms
V
O
-FM31
190
305
390 mVrms
CB
THD-FM
mono
–1
0
0.3
84
66
+1
1
dB
%
dB
dB
Signal-To-Noise Ratio: IF S/N-FM IF
AM Suppression Ratio:
IF
AMR IF
Att-1
5
11
15
dB
Muting Attenuation
Att-2
10.7 MHz, 100 dBµ, 1 kHz. Attenuation at
pin 15 when V33 changes from 0 to 2 V*1
10.7 MHz, 100 dBµ, 1 kHz. Attenuation at
15
22
25
dB
Att-3
pin 15 when V33 changes from 0 to 2
V*2
28
32
38
dB
Separation
Separation
10.7 MHz, 100 dBµ, L+R = 90%, pilot =
10%. The pin 15 output ratio
The pilot modulation, V26<0.5V
The pilot modulation, V26>3.5V
30
40
dB
Stereo on Level
Stereo off Level
ST-ON
ST-OFF
1.2
0.6
2.4
1.7
4.4
%
%
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 3 of 19
SA1787
Characteristics
Main Total Harmonic
Distortion
Symbol
THD-Main L
Test conditions
10.7 MHz, 100 dBµ, L+R = 90%, pilot =
10%. Signal at pin 15
10.7 MHz, 100 dBµ, pilot = 10%.
Pilot Cancellation
PCAN
The pin 15 signal/the pilot level leakage.
DIN audio
10.7 MHz, 100 dBµ, L-R = 90%, pilot =
SNC Output Attenuation
AttSNC
10%.
V28 = 3 V
pilot = 10%.
V29 = 3 V
AttHCC-2
0.6 V, pin 15
6
10
14
dB
0.6 V, pin 15
10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%,
AttHCC-1
HCC Output Attenuation
0.5
4.5
8.5
dB
1
6
9
dB
20
30
dB
Min.
Typ.
0.2
Max.
1.2
Unit
%
10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%,
pilot = 10%. V29 = 3 V 0.1 V, pin 15
100 dBµ, 10.7 MHz, 30% modulation.
The IF input, output voltage reduces by
3 dB
The IF input level (unmodulated) when
V33 = 2 V
The IF input level (unmodulated) (over
Input Limiting Voltage
Vi-lim
33
40
47
dBµ
Muting Sensitivity
Vi-mute
27
35
43
dBµ
SD Sensitivity
SD-sen1 FM 100 mV rms) , the IF counter buffer
output is turned on
SD-sen2 FM
54
54
63
62
170
0.2
1.3
2.7
5.0
220
0.10
70
70
dBµ
dBµ
IF Counter Buffer Output V
IFBUFF-FM
V
SM
FM-1
V
SM
FM-2
Signal Meter Output
V
SM
FM-3
V
SM
FM-4
Muting Bandwidth
Mute Drive Output
[FM FE Mixer Input]
BW-mute
V
MUTE-100
10.7 MHz, 100 dBµ, unmodulated. Output
at pin 23
No input. DC output at pin 24,
unmodulated
50 dBµ. DC output at pin 24,
unmodulated
70 dBµ. DC output at pin 24,
unmodulated
100 dBµ. DC output at pin 24,
unmodulated
100 dBµ. The bandwidth when V33 = 2 V,
unmodulated
100 dBµ, 0 dBµ. DC output at pin 33,
unmodulated
83 MHz, unmodulated.
120
0.0
0.4
2.0
4.7
150
0.00
250 mVrms
0.4
1.6
3.5
5.5
290
0.20
V
V
V
V
kHz
V
N-AGC on Input
V
N
-AGC
The input such that the pin 2 voltage is
2.0 V or below
79
88
99
dBµ
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 4 of 19
SA1787
Characteristics
Symbol
Test conditions
83 MHz, unmodulated. The input such
W-AGC on Input
V
W
AGC
that the pin 2 voltage is 2.0 V or below.
(When the keyed AGC is set to 4.0 V.)
Conversion Gain
Oscillator Buffer Output
Gate Time
A.V
83 MHz, 80 dBµ, unmodulated. output at
The FE CF
19
85
30
110
55
48
mVrms
104
110
116
dBµ
Min.
Typ.
Max.
Unit
V
OSCBUFFF
No input
τGATE1
f = 1 kHz, for a 1-µs, 100-mV p-o pulse
The level of a 1 kHz, 1-µs pulse input that
165 mVrms
µs
[NC Block] NC Input (Pin 30)
Noise Sensitivity
SN
starts noise canceller operation.
Measured at pin 30.
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)
40
mVp-o
NC Effect
SN-NC
5
[Multipath Rejection Circuit] MRC Input (Pin 27)
MRC Output
MRC Operating Level
VMRC
MRC-ON
V24 = 5 V
The pin 32 input level at f = 70 kHz,
voltage at pin 24 is 5V and pin 27 is 2V
1 MHz, 30 dBµ, fm = 1 kHz, 30%
modulation, pin 15
1 MHz, 74 dBµ, fm = 1 kHz, 30%
modulation, pin 15
1 MHz, 74 dBµ, fm = 1 kHz, 30%
modulation, pin 31
1 MHz, 74 dBµ, referenced to the output,
Agc F.O.M.
V
AGC-FOM
the input amplitude such that the output
falls by 10 dB. Pin 15
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
0.0
4.8
185
51
56
61
dB
2.2
10
2.3
15
2.4
20
V
mVrms
[AM Characteristics] AM ANT Input
Practical Sensitivity
Detector Output
Pin 31 Detector Output
S/N-30
V
O
-AM
V
O
-AM31
20
130
110
195
175
dB
270 mVrms
230
mVms
Signal-To-Noise Ratio
S/N-AM
47
52
0.3
0.4
6
230
1
0.7
7.3
dB
%
V
V
mVrms
Total Harmonic Distortion THD-AM
Signal Meter Output
Oscillator Buffer Output
V
SM
AM-1
V
SM
AM-2
V
OSCBUFF
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.08.29
Page 5 of 19
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