Sanyo LA1787NM Single-chip car radio system ic Datasheet

Ordering number : ENA0229
Monolithic Linear IC
LA1787NM
Single-Chip Car Radio
System IC
Overview
The LA1787NM integrates the six circuit blocks required in a car tuner on a single chip.
Features
• Improved noise prevention and reduction.
- Excellent three-signal characteristics equivalent to the Sanyo LA1193 FM front end IC.
- Improved medium and weak field noise canceller characteristics provide superb listenability.
- Improved separation.
- Built-in anti-birdie filter.
- Improved AM and FM temperature characteristics.
- Excellent FM S-meter linearity.
- Modified noise canceller circuit achieves improved noise rejection.
• Improved AM adjacent channel characteristics (∆40kHz).
• Double conversion AM tuner (upconversion).
- Fewer external components required than earlier double conversion tuners, no crystal required (when used as a pair
with the LC72144).
• Built-in FM IF circuit sample-to-sample variations correction circuit for the FM IF circuit.
(The SD, KEYEDAGC, MUTE ON, ADJ, MUTE ATT, SNC, and HCC pins can all used fixed resistors.)
• Improved FM separation temperature characteristics.
• This product inherits the block arrangement of the LA1780M, and allows pin compatible design in end products.
• The LA1787NM adds an FM S-meter shifter function to the LA1787M.
Functions
• FM front end.
• Multiplexer.
• FM IF.
• AM upconverter.
• Noise canceller.
• FM/AM switch.
• MRC.
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
92706 / 12506 MS OT B8-7095 No.A0229-1/6
LA1787NM
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
VCC1 max
VCC2 max
Allowable power dissipation
Pd max
Conditions
Ratings
Pins 6, 40, and 61
Unit
9.0
Pins 7, 45, 54, 59, and 60
Ta ≤ 55°C
V
12
V
950
mW
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-40 to +150
°C
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
VCCST IND
Operating supply voltage range
Conditions
Ratings
Pins 6, 7, 40, 45, 54, 59, 60, and 61
Unit
8.0
V
5
V
7.5 to 9.0
V
Pins 26
VCC op
Operating Characteristics at Ta = 25°C, VCC = 8.0V, in the specified test circuit, FM IF input
* : Note that these tests are made using an IC socket, models IC-51-0644-824 and KS8277 (Yamaichi Electronics Co., Ltd.).
Parameter
Symbol
Conditions
Switch settings
1
2
3
4
5
6
7
Ratings
8
9
10
min
typ
max
Unit
FM Characteristics - FM IF Input
Quiescent
ICCO-FM
No input, I40+I45+I54+I59+I60+I61
ON
B OFF B
ON OFF OFF ON
60
94
110
mA
10.7MHz, 100dBµ, 1kHz,
ON
B OFF B
ON OFF OFF ON
205
310
415
mVrms
ON
B OFF B
ON OFF OFF ON
190
295
380
mVrms
ON
B OFF B
ON OFF OFF ON
-1
0
+1
dB
ON
B OFF B
ON OFF OFF ON
0.3
1
%
ON
B OFF B
ON OFF OFF ON
75
82
dB
ON
B OFF B
ON OFF OFF ON
55
68
dB
ON
B OFF B
ON OFF OFF ON
5
10
15
dB
ON
B OFF B
ON ON OFF ON
15
20
25
dB
ON
B OFF B
ON ON OFF ON
28
33
38
dB
ON
B OFF B
ON OFF OFF ON
30
40
ON
B OFF B
ON OFF OFF ON
2.1
4.1
ON
B OFF B
ON OFF OFF ON
1.3
3.2
ON
B OFF B
ON OFF OFF ON
ON
B OFF B
ON OFF OFF OFF
current
Demodulated
VO-FM
output
Pin 31
100% modulation, the pin 15 output
VO-FM31
demodulated
10.7MHz, 100dBµ, 1kHz,
100% modulation, the pin 31 output
output
Channel
CB
balance
Total harmonic
THD-FMmono 10.7MHz, 100dBµ, 1kHz,
distortion
Signal-to-noise
100% modulation, pin 15
S/N-FM IF
ratio (IF)
AM rejection
10.7MHz, 100dBµ, 1kHz,
100% modulation, pin 15
AMR IF
ratio (IF)
Muting
10.7MHz, 100dBµ, 1kHz,
Pins 15, 16 ratio
10.7MHz, 100dBµ, 1kHz, fm = 1kHz,
pin 15 when 30% AM
Att-1
attenuation (1)
10.7MHz, 100dBµ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V
Muting
Att-2
attenuation (2)
10.7MHz, 100dBµ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V *1
Muting
Att-3
attenuation (3)
10.7MHz, 100dBµ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V *2
Separation
Separation
10.7MHz, 100dBµ, L+R = 90%,
dB
pilot = 10%, the pin 15 output ratio
Stereo on level
ST-ON
The pilot modulation such that V26 is
6.1
%
less than 0.5V
Stereo off level
ST-OFF
The pilot modulation such that V26 is
%
less than 3.5V
Main distortion
THD-Main L
10.7MHz, 100dBµ, L+R = 90%,
0.3
1.2
%
pilot = 10%, pin 15
Pilot
PCAN
cancellation
10.7MHz, 100dBµ, pilot = 10%,
Pin 15 signal
20
30
1
5
dB
/ON
The pilot level leakage, DIN audio
SNC output
attenuation
AttSNC
10.7MHz, 100dBµ, L-R = 90%,
ON
B OFF B
ON OFF OFF ON
9
dB
pilot = 10%, V28 = 3V→0.6V, pin 15
Continued on next page.
No.A0229-2/6
LA1787NM
Continued from preceding page.
Parameter
HCC output
Symbol
Conditions
AttHCC-1
10.7MHz, 100dBµ, 10kHz,
attenuation (1)
Switch settings
1
2
3
4
5
6
7
Ratings
8
9
10
min
typ
max
Unit
ON
B OFF B
ON OFF OFF ON
0.5
4.5
8.5
dB
ON
B OFF B
ON OFF OFF ON
6
10
14
dB
ON
B OFF B
ON OFF OFF ON ON
33
40
47
dBµ
ON
B OFF B
ON OFF OFF ON
27
35
43
dBµ
ON
B OFF B OFF OFF OFF OFF ON
54
62
70
dBµ
B OFF B
ON OFF OFF OFF ON
54
62
70
dBµ
L+R = 90%, pilot = 10%,
V29 = 3V→0.6V, pin 15
HCC output
AttHCC-2
10.7MHz, 100dBµ, 10kHz,
attenuation (2)
L+R = 90%, pilot = 10%,
V29 = 3V→0.1V, pin 15
Input limiting
Vi-lim
100dBµ, 10.7MHz, 30% modulation
voltage
The IF input such that the output is
-3dB down referenced to the input
Muting
Vi-mute
The IF input level when V33 = 2V,
sensitivity
SD sensitivity
no modulation
SD-sen1FM
The IF input such that the IF counter
(1)
buffer output goes to the on state
(100mVrms or higher)
SD sensitivity
SD-sen2FM
The IF input such that the SD pin goes ON
(2)
to the on state, no modulation
IF counter buffer VIFBUFF-FM 10.7MHz, 100dBµ, no modulation,
output
The pin 23 output
ON
B OFF B OFF OFF OFF OFF ON
130
200
270
mVrms
S-meter output
ON
B OFF B
OFF OFF OFF ON
0.0
0.1
0.3
V
ON
B OFF B
OFF OFF OFF ON
0.4
1.0
1.5
V
ON
B OFF B
OFF OFF OFF ON
2.0
2.7
3.5
V
ON
B OFF B
OFF OFF OFF ON
4.7
5.5
6.2
V
ON
B OFF B
OFF OFF OFF ON
150
220
290
kHz
ON
B OFF B
OFF OFF OFF ON
0.00
0.03
0.20
V
A
ON
B
ON OFF OFF
81
88
95
dBµ
A
ON
B
ON OFF OFF
104
110
116
dBµ
ON
A
ON
B
ON OFF OFF
19
30
48
mVrms
ON
A
ON
B
ON OFF OFF
85
110
165
mVrms
VSMFM-1
No input, the pin 24 DC output,
no modulation
VSMFM-2
50dBµ, the pin 24 DC output,
no modulation
VSMFM-3
70dBµ, the pin 24 DC output,
no modulation
VSMFM-4
100dBµ, the pin 24 DC output,
no modulation
Muting
BW-mute
100dBµ, the bandwidth when V33 =
attenuation
Muting drive
2V, no modulation
VMUTE-100
100dBµ, 0dBµ, the pin 33 DC output,
output
no modulation
FM Front End Mixer Input
N-AGC on input
VNAGC
83MHz no modulation, the input such ON
that pin 2 becomes 2.0V or lower
W-AGC on
VWAGC
83MHz no modulation, the input such ON
input
that pin 2 becomes 2.0V or lower
(when the keyed AGC is 4.0V)
Conversion gain
A. V
83MHz, 80dBµ, no modulation, the
FE CF output
Oscillator buffer
No input
VOSCBUFFFM
output
Noise Canceller Block - NC Input (pin 30)
Gate time
τ GATE
OFF A
ON OFF OFF
55
µs
ON
OFF A
ON OFF OFF
40
mVp-o
The pulse exclusion effect due to
ON/
OFF A
ON OFF OFF
noise canceller operation.
OFF
f = 1kHz, 1µs, with a 100mVp-o pulse ON
input
Noise sensitivity
SN
The 1kHz 1µs pulse input level such
that noise canceller operation starts
Noise canceller
SN-NC
effect
5
Repetition frequency for a 1µs pulse.
The ratio of the FM mode pin 15
output referenced to the pin 15 output
in 10kHz 150mVp-o AM mode.
Multipath Rejection Circuit - MRC Input (pin 27)
MRC output
MRC operating
VMRC
V24 = 5V
MRC-ON
level
ON
OFF B
ON OFF OFF
2.2
2.3
2.4
V
The pin 32 input level such that pin 24 ON
OFF B
ON OFF OFF
10
15
20
mVrms
= 5V and pin 27 = 2V, f = 70kHz
AM Characteristics - ANT IN input
Practical
S/N-30
sensitivity
Detection output
1MHz, 30dBµ, fm = 1kHz,
OFF
OFF B
ON ON
20
OFF
OFF B
ON ON
130
dB
30% modulation, pin 15
VO-AM
1MHz, 74dBµ, fm = 1kHz,
195
270
mVrms
30% modulation, pin 15
Continued on next page.
No.A0229-3/6
LA1787NM
Continued from preceding page.
Parameter
Symbol
Pin 31 detection
VO-AM31
output
AGC-F.O.M
Switch settings
Conditions
1MHz, 74dBµ, fm = 1kHz,
1
2
3
4
5
6
7
Ratings
8
9
10
min
typ
max
Unit
OFF
OFF B
ON ON
110
175
230
mVrms
OFF
OFF B
ON ON
51
56
61
dB
OFF
OFF B
ON ON
47
52
OFF
OFF B
ON ON
30% modulation, pin 31
VAGC-FOM
1MHz, 74dBµ, referenced to the
output, the input width such that the
output falls by 10dB, pin 15
Signal-to-noise
S/N-AM
ratio
Total harmonic
dB
30% modulation
THD-AM
distortion
S-meter output
1MHz, 74dBµ, fm = 1kHz,
1MHz, 74dBµ, fm = 1kHz,
0.3
1
%
80% modulation
VSMAM-1
No input
OFF
OFF B
ON ON
0.0
0.2
0.5
V
VSMAM-2
1MHz, 130dBµ, no modulation
OFF
OFF B
ON ON
4.8
6.0
7.3
V
OFF
OFF B
ON ON
185
230
Oscillator buffer VOSCBUFFAM1 No input, the pin 15 output
mVrms
output
Wideband AGC
W-AGCsen1
1.4MHz, the input when V46 = 0.7V
OFF
OFF B
ON ON
92
98
104
dBµ
sensitivity
W-AGCsen2
1.4MHz, the input when V46 = 0.7V
OFF
OFF B
ON ON
83
89
95
dBµ
OFF
OFF B
OFF OFF
24
30
36
dBµ
OFF
OFF B
OFF OFF
24
30
36
dBµ
OFF
OFF B
OFF OFF
200
290
(during a seek)
SD sensitivity
SD-sen1AM
1MHz, the ANT input level such that
the IF counter output turns on.
SD-sen2AM
1MHz, the ANT input level such that
the SD pin goes to the on state.
IF buffer output
VIFBUFF-AM
1MHz, 74dbµ non-mod, the pin 23
mVrms
output
*1: When the value of the resistor between pin 58 and ground is 200kΩ.
*2: When the value of the resistor between pin 58 and ground is 30kΩ.
Package Dimensions
unit : mm
3159A
No.A0229-4/6
LA1787NM
IF limiter
amplifier
Block Diagram and Test Circuit
PCA00627
No.A0229-5/6
LA1787NM
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performance, characteristics, and functions of the described products in the independent state, and are
not guarantees of the performance, characteristics, and functions of the described products as mounted
in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an
independent device, the customer should always evaluate and test devices mounted in the customer's
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This catalog provides information as of January, 2006. Specifications and information herein are subject
to change without notice.
PS No.A0229-6/6
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