參數(shù)資料
型號： LA1784M
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝： QIP-64
文件頁數(shù)： 23/50頁
文件大?。?/td> 568K
代理商： LA1784M
Ratings
Parameter
Symbol
Conditions
min
typ
max
unit
[FM FE Mixer Input
N-AGC on input
VN-AGC
83 MHz, unmodulated.
81
88
95
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
104
110
116
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
85
110
165
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
130
195
270
mVrms
Pin 31 detector output
VO-AM31
1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 31
110
175
230
mVms
AGC F.O.M.
VAGC-FOM
1 MHz, 74 dB, referenced to the output, the input amplitude
59
64
69
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
3.5
4.4
6.1
V
Oscillator buffer output
VOSCBUFF AM1
No input, the pin 15 output
185
230
mVrms
Wide band AGC sensitivity
W-AGCsen1
1.4 MHz, the input when V46 = 0.7 V
92
98
104
dB
W-AGCsen2
1.4 MHz, the input when V46 = 0.7 V (seek mode)
83
89
95
dB
SD sensitivity
SD-sen1 AM
1 MHz, the ANT input level such that the IF counter output turns on.
24
30
36
dB
SD-sen2 AM
1 MHz, the ANT input level such that the SD pin goes to the on state.
24
30
36
dB
IF buffer output
VIFBUFF-AM
1 MHz, 74 dB, unmodulated. The pin 23 output
200
290
mVrms
No. 6039-3/50
LA1784M
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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