LA1780 View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LA1780 Datasheet PDF : 38 Pages
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LA1780M
Continued from preceding page.
Parameter
Symbol
Conditions
[FM FE Mixer Input
N-AGC on input
VN-AGC
83 MHz, unmodulated.
The input such that the pin 2 voltage is 2.0 V or below
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.)
Conversion gain
A.V
83 MHz, 80 dBµ, unmodulated. The FE CF output
Oscillator buffer output
[NC Block] NC input (pin 30)
VOSCBUFFFM
No input
Gate time
τGATE1
f = 1 kHz, for a 1-µs, 100-mV p-o pulse
Noise sensitivity
SN
The level of a 1 = kHz, 1-µs pulse input that starts
noise canceller operation. Measured at pin 30.
NC effect
SN-NC
The pulse rejection effect provided by the noise canceller.
For a repeated 1-µs wide pulse, frequency = 10 kHz,
150 mV p-o. The ratio of the FM mode pin 15 output
referenced to the AM mode pin 15 output (effective value)
[Multipath Rejection Circuit] MRC input (pin 27)
MRC output
VMRC
V24 = 5 V
MRC operating level
MRC-ON
The pin 32 input level at f = 70 kHz such that
pin 24 goes to 5 V and pin 27 goes to 2 V
[AM Characteristics] AM ANT input
Practical sensitivity
Detector output
Pin 31 detector output
AGC F.O.M.
S/N-30
VO-AM
VO-AM31
VAGC-FOM
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, the input amplitude
such that the output falls by 10 dB. Pin 15
Signal-to-noise ratio
Total harmonic distortion
Signal meter output
Oscillator buffer output
Wide band AGC sensitivity
S/N-AM
THD-AM
VSM AM-1
VSM AM-2
VOSCBUFF AM1
W-AGCsen1
W-AGCsen2
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, the pin 5 output
1.4 MHz, the input when V46 = 0.7 V
1.4 MHz, the input when V46 = 0.7 V (seek mode)
SD sensitivity
SD-sen1 AM 1 MHz, the ANT input level such that the IF counter output turns on.
SD-sen2 AM 1 MHz, the ANT input level such that the SD pin goes to the on state.
IF buffer output
VIFBUFF-AM 1 MHz, 74 dBµ, unmodulated. The pin 23 output
Ratings
min
typ
max
80
87
94
100
106
112
19
30
48
260
370
480
55
40
5
2.2
2.3
2.4
10
15
20
20
85
120
170
75
110
150
56
61
66
47
52
0.3
1
0.0
0.2
0.5
3.8
4.8
6.2
185
230
83
89
95
74
80
86
26
32
38
26
32
38
200
290
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 kΩ.
* 2. When the resistor between pin 58 and ground is 30 kΩ.
unit
dBµ
dBµ
mVrms
mVrms
µs
mVp-o
V
mVrms
dB
mVrms
mVms
dB
dB
%
V
V
mVrms
dBµ
dBµ
dBµ
dBµ
mVrms
No. 5724-3/38
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