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LA1787M
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Parameter
Symbol
Conditions
min
Ratings
typ
max
unit
[FM FE Mixer Input
N-AGC on input
W-AGC on input
Conversion gain
Oscillator buffer output
V N -AGC
V W AGC
A.V
V OSCBUFFFM
83 MHz, unmodulated.
The input such that the pin 2 voltage is 2.0 V or below
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.)
83 MHz, 80 dBμ, unmodulated. The FE CF output
No input
81
104
19
85
88
110
30
110
95
116
48
165
dBμ
dBμ
mVrms
mVrms
[NC Block] NC input (pin 30)
Gate time
Noise sensitivity
τ GATE1
SN
f = 1 kHz, for a 1-μs, 100-mV p-o pulse
The level of a 1 = kHz, 1-μs pulse input that starts
noise canceller operation. Measured at pin 30.
55
40
μs
mVp-o
The pulse rejection effect provided by the noise canceller.
NC effect
SN-NC
For a repeated 1-μs wide pulse, frequency = 10 kHz,
150 mV p-o. The ratio of the FM mode pin 15 output
5
referenced to the AM mode pin 15 output (effective value)
[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 such that
pin 24 goes to 5 V and pin 27 goes to 2 V
2.2
10
2.3
15
2.4
20
V
mVrms
[AM Characteristics] AM ANT input
Practical sensitivity
S/N-30
1 MHz, 30 dBμ, f m = 1 kHz, 30% modulation, pin 15
20
dB
Detector output
Pin 31 detector output
AGC F.O.M.
Signal-to-noise ratio
Total harmonic distortion
Signal meter output
Oscillator buffer output
Wide band AGC sensitivity
SD sensitivity
IF buffer output
V O -AM
V O -AM31
V AGC-FOM
S/N-AM
THD-AM
V SM AM-1
V SM AM-2
V OSCBUFF AM1
W-AGCsen1
W-AGCsen2
SD-sen1 AM
SD-sen2 AM
V IFBUFF-AM
1 MHz, 74 dBμ, f m = 1 kHz, 30% modulation, pin 15
1 MHz, 74 dBμ, f m = 1 kHz, 30% modulation, pin 31
1 MHz, 74 dBμ, referenced to the output, the input amplitude
such that the output falls by 10 dB. Pin 15
1 MHz, 74 dBμ, f m = 1 kHz, 30% modulation
1 MHz, 74 dBμ, f m = 1 kHz, 80% modulation
No input
1 MHz, 130 dBμ, unmodulated
No input, the pin 15 output
1.4 MHz, the input when V46 = 0.7 V
1.4 MHz, the input when V46 = 0.7 V (seek mode)
1 MHz, the ANT input level such that the IF counter output turns on.
1 MHz, the ANT input level such that the SD pin goes to the on state.
1 MHz, 74 dBμ, unmodulated. The pin 23 output
130
110
51
47
0.0
4.8
185
92
83
24
24
200
195
175
56
52
0.3
0.2
6
230
98
89
30
30
290
270
230
61
1
0.5
7.3
104
95
36
36
mVrms
mVms
dB
dB
%
V
V
mVrms
dBμ
dBμ
dBμ
dBμ
mVrms
Note: These measurements must be made using the either the IC-51-0644-824 or KS8277 IC socket (manufactured by Yamaichi Electronics).
* 1. When the resistor between pin 58 and ground is 200 k ? .
* 2. When the resistor between pin 58 and ground is 30 k ? .
No. 6655-3/54
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