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| 型號： | LA1781M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | 14 X 14 MM, QIP-64 |
| 文件頁數(shù)： | 23/48頁 |
| 文件大?。?/td> | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-3/48
Continued from preceding page.
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
FM FE Mixer input
N-AGC on input
VNAGC
83MHz, unmodulated.
The input such that the pin 2 voltage is 2.0V or below
81
88
95
dB
μ
W-AGC on input
VWAGC
83MHz, unmodulated. The input such that the pin 2
voltage is 2.0V or below. (When the keyed AGC is set to 4.0V.)
104
110
116
dB
μ
Conversion gain
A. V
83MHz, 80dB
μ, unmodulated. The FE CF output
19
30
48
mVrms
Oscillator buffer output
VOSCBUFF-FM No input
85
110
165
mVrms
NC Block NC input (pin 30)
Gate time
TGATE
f = 1kHz, for a 1
μs, 100-mVp-o pulse
55
μs
Noise sensitivity
SN
The level of a 1kHz, 1
μs pulse input that starts
noise canceller operation. Measured at pin 30.
40
mVp-o
NC effect
SN-NC
The pulse rejection effect provided by the noise canceller.
For a repeated 1
μs wide pulse, frequency = 10kHz,
150mVp-o. The ratio of the FM mode pin 15 output
referenced to the AM mode pin 15 output (effective value)
5
Multipath rejection circuit MRC input (pin 27)
MRC output
VMRC
V24 = 5V
2.2
2.3
2.4
V
MRC operating level
MRC-ON
The pin 32 input level at f = 70kHz such that
pin 24 goes to 5V and pin 27 goes to 2V
10
15
20
mVrms
AM characteristics AM ANT input
Practical sensitivity
S/N-30
1MHz, 30dB
μ, fm = 1kHz, 30% modulation, pin 15
20
dB
Detector output
VO-AM
1MHz, 74dB
μ, fm = 1kHz, 30% modulation, pin 15
130
195
270
mVrms
Pin 31 detector output
VO-AM31
1MHz, 74dB
μ, fm = 1kHz, 30% modulation, pin 31
110
175
230
mVrms
AGC F.O.M.
VAGC-FOM
1MHz, 74dB
μ, referenced to the output, the input amplitude
such that the output falls by 10dB. Pin 15
59
64
69
dB
Signal-to-noise ratio
S/N-AM
1MHz, 74dB
μ, fm = 1kHz, 30% modulation
47
52
dB
Total harmonic distortion
THD-AM
1MHz, 74dB
μ, fm = 1kHz, 80% modulation
0.3
1
%
VSMAM-1
No input
0.0
0.2
0.5
V
Signal meter output
VSMAM-2
1MHz, 130dB
μ, unmodulated
3.5
4.4
6.1
V
Oscillator buffer output
VOSCBUFF-AM1 No input, the pin 15 output
185
230
mVrms
W-AGCsen1
1.4MHz, the input when V46 = 0.7V
92
98
104
dB
μ
Wide band AGC sensitivity
W-AGCsen2
1.4MHz, the input when V46 = 0.7V (seek mode)
83
89
95
dB
μ
SD-sen1AM
1MHz, the ANT input level such that the IF counter output turns
on.
24
30
36
dB
μ
SD sensitivity
SD-sen2AM
1MHz, the ANT input level such that the SD pin goes to the on
state.
24
30
36
dB
μ
IF buffer output
VIFBUFF-AM
1MHz, 74dB
μ, unmodulated. The pin 23 output
200
290
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 200k
Ω.
*2. When the resistor between pin 58 and ground is 30k
Ω.
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