Improved AM adjacent channel characteristics (Δ40kHz).
•
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.
Semiconductor Components Industries, LLC, 2013
May, 2013
92706 / 12506 MS OT B8-7095 No.A0229-1/6
LA1787NM
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
VCC1 max
VCC2 max
Allowable power dissipation
Operating temperature
Storage temperature
Pd max
Topr
Tstg
Pins 6, 40, and 61
Pins 7, 45, 54, 59, and 60
Ta
≤
55°C
Conditions
Ratings
9.0
12
950
-40 to +85
-40 to +150
Unit
V
V
mW
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Symbol
VCC
VCCST IND
Operating supply voltage range
VCC op
Conditions
Pins 6, 7, 40, 45, 54, 59, 60, and 61
Pins 26
Ratings
8.0
5
7.5 to 9.0
Unit
V
V
V
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
8
9
10
min
Ratings
typ
max
Unit
FM Characteristics - FM IF Input
Quiescent
current
Demodulated
output
Pin 31
demodulated
output
Channel
balance
Total harmonic
distortion
Signal-to-noise
ratio (IF)
AM rejection
ratio (IF)
Muting
attenuation (1)
Muting
attenuation (2)
Muting
attenuation (3)
Separation
Stereo on level
Stereo off level
Main distortion
Pilot
cancellation
SNC output
attenuation
AttSNC
Separation
ST-ON
ST-OFF
THD-Main L
PCAN
Att-3
Att-2
Att-1
AMR IF
S/N-FM IF
CB
10.7MHz, 100dBμ, 1kHz,
Pins 15, 16 ratio
THD-FMmono 10.7MHz, 100dBμ, 1kHz,
100% modulation, pin 15
10.7MHz, 100dBμ, 1kHz,
100% modulation, pin 15
10.7MHz, 100dBμ, 1kHz, fm = 1kHz,
pin 15 when 30% AM
10.7MHz, 100dBμ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V
10.7MHz, 100dBμ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V *
1
10.7MHz, 100dBμ, 1kHz,
The pin 15 attenuation when V33 is
changed from 0 to 2V *
2
10.7MHz, 100dBμ, L+R = 90%,
pilot = 10%, the pin 15 output ratio
The pilot modulation such that V26 is
less than 0.5V
The pilot modulation such that V26 is
less than 3.5V
10.7MHz, 100dBμ, L+R = 90%,
pilot = 10%, pin 15
10.7MHz, 100dBμ, pilot = 10%,
Pin 15 signal
The pilot level leakage, DIN audio
10.7MHz, 100dBμ, L-R = 90%,
pilot = 10%, V28 = 3V→0.6V, pin 15
Continued on next page.
ON
B OFF B
ON OFF OFF ON
1
5
9
dB
ON
B OFF B
ON OFF OFF OFF
/ON
20
30
dB
ON
B OFF B
ON OFF OFF ON
0.3
1.2
%
ON
B OFF B
ON OFF OFF ON
1.3
3.2
%
ON
B OFF B
ON OFF OFF ON
2.1
4.1
6.1
%
ON
B OFF B
ON OFF OFF ON
30
40
dB
ON
B OFF B
ON ON OFF ON
28
33
38
dB
ON
B OFF B
ON ON OFF ON
15
20
25
dB
ON
B OFF B
ON OFF OFF ON
5
10
15
dB
ON
B OFF B
ON OFF OFF ON
55
68
dB
ON
B OFF B
ON OFF OFF ON
75
82
dB
ON
B OFF B
ON OFF OFF ON
0.3
1
%
ON
B OFF B
ON OFF OFF ON
-1
0
+1
dB
VO-FM31
VO-FM
10.7MHz, 100dBμ, 1kHz,
100% modulation, the pin 15 output
10.7MHz, 100dBμ, 1kHz,
100% modulation, the pin 31 output
ON
B OFF B
ON OFF OFF ON
190
295
380
mVrms
ON
B OFF B
ON OFF OFF ON
205
310
415
mVrms
ICCO-FM
No input, I40+I45+I54+I59+I60+I61
ON
B OFF B
ON OFF OFF ON
60
94
110
mA
No.A0229-2/6
LA1787NM
Continued from preceding page.
Parameter
HCC output
attenuation (1)
HCC output
attenuation (2)
Input limiting
voltage
Muting
sensitivity
SD sensitivity
(1)
SD sensitivity
(2)
SD-sen2FM
SD-sen1FM
Vi-mute
Vi-lim
AttHCC-2
Symbol
AttHCC-1
Conditions
10.7MHz, 100dBμ, 10kHz,
L+R = 90%, pilot = 10%,
V29 = 3V→0.6V, pin 15
10.7MHz, 100dBμ, 10kHz,
L+R = 90%, pilot = 10%,
V29 = 3V→0.1V, pin 15
100dBμ, 10.7MHz, 30% modulation
The IF input such that the output is
-3dB down referenced to the input
The IF input level when V33 = 2V,
no modulation
The IF input such that the IF counter
buffer output goes to the on state
(100mVrms or higher)
The IF input such that the SD pin goes ON
to the on state, no modulation
ON
ON
ON
ON
ON
ON
ON
B OFF B OFF OFF OFF OFF ON
B OFF B
B OFF B
B OFF B
B OFF B
B OFF B
B OFF B
OFF OFF OFF ON
OFF OFF OFF ON
OFF OFF OFF ON
OFF OFF OFF ON
OFF OFF OFF ON
OFF OFF OFF ON
130
0.0
0.4
2.0
4.7
150
0.00
200
0.1
1.0
2.7
5.5
220
0.03
270
0.3
1.5
3.5
6.2
290
0.20
mVrms
V
V
V
V
kHz
V
B OFF B
ON OFF OFF OFF ON
54
62
70
dBμ
ON
B OFF B OFF OFF OFF OFF ON
54
62
70
dBμ
ON
B OFF B
ON OFF OFF ON
27
35
43
dBμ
ON
B OFF B
ON OFF OFF ON ON
33
40
47
dBμ
ON
B OFF B
ON OFF OFF ON
6
10
14
dB
Switch settings
1
ON
2
3
4
5
6
7
8
9
10
min
0.5
Ratings
typ
4.5
max
8.5
Unit
dB
B OFF B
ON OFF OFF ON
IF counter buffer VIFBUFF-FM 10.7MHz, 100dBμ, no modulation,
output
The pin 23 output
S-meter output
VSMFM-1
VSMFM-2
VSMFM-3
VSMFM-4
Muting
attenuation
Muting drive
output
FM Front End Mixer Input
N-AGC on input
W-AGC on
input
Conversion gain
Oscillator buffer
output
Noise Canceller Block - NC Input (pin 30)
Gate time
Noise sensitivity
Noise canceller
effect
τ
GATE
SN
SN-NC
A. V
VOSCBUFFFM
No input, the pin 24 DC output,
no modulation
50dBμ, the pin 24 DC output,
no modulation
70dBμ, the pin 24 DC output,
no modulation
100dBμ, the pin 24 DC output,
no modulation
100dBµ, the bandwidth when V33 =
2V, no modulation
100dBµ, 0dBµ, the pin 33 DC output,
no modulation
BW-mute
VMUTE-100
VNAGC
VWAGC
83MHz no modulation, the input such ON
that pin 2 becomes 2.0V or lower
83MHz no modulation, the input such ON
that pin 2 becomes 2.0V or lower
(when the keyed AGC is 4.0V)
83MHz, 80dBµ, no modulation, the
FE CF output
No input
ON
ON
A
A
ON
ON
B
B
ON OFF OFF
ON OFF OFF
81
104
88
110
95
116
dBμ
dBμ
A
A
ON
ON
B
B
ON OFF OFF
ON OFF OFF
19
85
30
110
48
165
mVrms
mVrms
f = 1kHz, 1μs, with a 100mVp-o pulse ON
input
The 1kHz 1μs pulse input level such
that noise canceller operation starts
The pulse exclusion effect due to
noise canceller operation.
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.
ON/
OFF
ON
OFF A
OFF A
OFF A
ON OFF OFF
ON OFF OFF
ON OFF OFF
5
55
40
μs
mVp-o
Multipath Rejection Circuit - MRC Input (pin 27)
MRC output
MRC operating
level
AM Characteristics - ANT IN input
Practical
sensitivity
Detection output
VO-AM
S/N-30
1MHz, 30dBµ, fm = 1kHz,
30% modulation, pin 15
1MHz, 74dBµ, fm = 1kHz,
30% modulation, pin 15
Continued on next page.
OFF
OFF B
ON ON
130
195
270
mVrms
OFF
OFF B
ON ON
20
dB
VMRC
MRC-ON
V24 = 5V
= 5V and pin 27 = 2V, f = 70kHz
ON
OFF B
OFF B
ON OFF OFF
ON OFF OFF
2.2
10
2.3
15
2.4
20
V
mVrms
The pin 32 input level such that pin 24 ON
No.A0229-3/6
LA1787NM
Continued from preceding page.
Parameter
Pin 31 detection
output
AGC-F.O.M
VAGC-FOM
Symbol
VO-AM31
Conditions
1MHz, 74dBµ, fm = 1kHz,
30% modulation, pin 31
1MHz, 74dBμ, referenced to the
output, the input width such that the
output falls by 10dB, pin 15
Signal-to-noise
ratio
Total harmonic
distortion
S-meter output
VSMAM-1
VSMAM-2
THD-AM
S/N-AM
1MHz, 74dBµ, fm = 1kHz,
30% modulation
1MHz, 74dBµ, fm = 1kHz,
80% modulation
No input
1MHz, 130dBµ, no modulation
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF B
OFF B
OFF B
OFF B
OFF B
OFF B
OFF B
OFF B
ON ON
ON ON
ON ON
ON ON
ON ON
OFF OFF
OFF OFF
OFF OFF
0.0
4.8
185
92
83
24
24
200
0.2
6.0
230
98
89
30
30
290
104
95
36
36
0.5
7.3
V
V
mVrms
dBμ
dBμ
dBμ
dBμ
mVrms
OFF
OFF B
ON ON
0.3
1
%
OFF
OFF B
ON ON
47
52
dB
OFF
OFF B
ON ON
51
56
61
dB
Switch settings
1
OFF
2
3
4
5
6
7
8
9
10
min
110
Ratings
typ
175
max
230
Unit
mVrms
OFF B
ON ON
Oscillator buffer
VOSCBUFFAM1
No input, the pin 15 output
output
Wideband AGC
sensitivity
SD sensitivity
W-AGCsen1
W-AGCsen2
SD-sen1AM
SD-sen2AM
IF buffer output
VIFBUFF-AM
1.4MHz, the input when V46 = 0.7V
1.4MHz, the input when V46 = 0.7V
(during a seek)
1MHz, the ANT input level such that
the IF counter output turns on.
1MHz, the ANT input level such that
the SD pin goes to the on state.
1MHz, 74dbμ non-mod, the pin 23
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.
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