參數(shù)資料
型號： LA1780M
元件分類： 調(diào)諧器
英文描述： 2-BAND, AUDIO TUNER, PQFP64
封裝： QFP-64
文件頁數(shù)： 23/38頁
文件大?。?/td> 764K
代理商： LA1780M
Ratings
Parameter
Symbol
Conditions
min
typ
max
unit
[FM FE Mixer Input
N-AGC on input
VN-AGC
83 MHz, unmodulated.
80
87
94
dB
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
100
106
112
dB
voltage is 2.0 V or below. (When the keyed AGC is set to 4.0 V.)
Conversion gain
A.V
83 MHz, 80 dB, unmodulated. The FE CF output
19
30
48
mVrms
Oscillator buffer output
VOSCBUFFFM
No input
260
370
480
mVrms
[NC Block] NC input (pin 30)
Gate time
τGATE1
f = 1 kHz, for a 1-s, 100-mV p-o pulse
55
s
Noise sensitivity
SN
The level of a 1 = kHz, 1-s pulse input that starts
40
mVp-o
noise canceller operation. Measured at pin 30.
The pulse rejection effect provided by the noise canceller.
NC effect
SN-NC
For a repeated 1-s wide pulse, frequency = 10 kHz,
5
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
2.2
2.3
2.4
V
MRC operating level
MRC-ON
The pin 32 input level at f = 70 kHz such that
10
15
20
mVrms
pin 24 goes to 5 V and pin 27 goes to 2 V
[AM Characteristics] AM ANT input
Practical sensitivity
S/N-30
1 MHz, 30 dB, fm = 1 kHz, 30% modulation, pin 15
20
dB
Detector output
VO-AM
1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 15
85
120
170
mVrms
Pin 31 detector output
VO-AM31
1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 31
75
110
150
mVms
AGC F.O.M.
VAGC-FOM
1 MHz, 74 dB, referenced to the output, the input amplitude
56
61
66
dB
such that the output falls by 10 dB. Pin 15
Signal-to-noise ratio
S/N-AM
1 MHz, 74 dB, fm = 1 kHz, 30% modulation
47
52
dB
Total harmonic distortion
THD-AM
1 MHz, 74 dB, fm = 1 kHz, 80% modulation
0.3
1
%
Signal meter output
VSM AM-1
No input
0.0
0.2
0.5
V
VSM AM-2
1 MHz, 130 dB, unmodulated
3.8
4.8
6.2
V
Oscillator buffer output
VOSCBUFF AM1
No input, the pin 5 output
185
230
mVrms
Wide band AGC sensitivity
W-AGCsen1
1.4 MHz, the input when V46 = 0.7 V
83
89
95
dB
W-AGCsen2
1.4 MHz, the input when V46 = 0.7 V (seek mode)
74
80
86
dB
SD sensitivity
SD-sen1 AM
1 MHz, the ANT input level such that the IF counter output turns on.
26
32
38
dB
SD-sen2 AM
1 MHz, the ANT input level such that the SD pin goes to the on state.
26
32
38
dB
IF buffer output
VIFBUFF-AM
1 MHz, 74 dB, unmodulated. The pin 23 output
200
290
mVrms
No. 5724-3/38
LA1780M
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
.
Continued from preceding page.
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