LA1781M_09 Datasheet, PDF (3/48 Pages) Sanyo Semicon Device – For Car Radios Single-Chip Tuner IC

LA1781M
Continued from preceding page.
Parameter
Symbol
Conditions
Ratings
Unit
min typ max
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 dBμ
W-AGC on input
VWAGC
83MHz, unmodulated. The input such that the pin 2
104 110 116 dBμ
voltage is 2.0V or below. (When the keyed AGC is set to 4.0V.)
Conversion gain
A. V
83MHz, 80dBμ, unmodulated. The FE CF output
19
30
48 mVrms
Oscillator buffer output
NC Block NC input (pin 30)
VOSCBUFF-FM No input
85 110 165 mVrms
Gate time
Noise sensitivity
TGATE
SN
f = 1kHz, for a 1μs, 100-mVp-o pulse
The level of a 1kHz, 1μs pulse input that starts
noise canceller operation. Measured at pin 30.
55
μs
40
mVp-o
NC effect
SN-NC
The pulse rejection effect provided by the noise canceller.
5
For a repeated 1μs 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)
Multipath rejection circuit MRC input (pin 27)
MRC output
MRC operating level
VMRC
MRC-ON
V24 = 5V
The pin 32 input level at f = 70kHz such that
pin 24 goes to 5V and pin 27 goes to 2V
2.2
2.3
2.4
V
10
15
20 mVrms
AM characteristics AM ANT input
Practical sensitivity
S/N-30
1MHz, 30dBμ, fm = 1kHz, 30% modulation, pin 15
20
dB
Detector output
Pin 31 detector output
AGC F.O.M.
VO-AM
VO-AM31
VAGC-FOM
1MHz, 74dBμ, fm = 1kHz, 30% modulation, pin 15
1MHz, 74dBμ, fm = 1kHz, 30% modulation, pin 31
1MHz, 74dBμ, referenced to the output, the input amplitude
such that the output falls by 10dB. Pin 15
130 195 270 mVrms
110 175 230 mVrms
59
64
69 dB
Signal-to-noise ratio
S/N-AM
1MHz, 74dBμ, fm = 1kHz, 30% modulation
47
52
dB
Total harmonic distortion
THD-AM
1MHz, 74dBμ, fm = 1kHz, 80% modulation
0.3
1%
Signal meter output
Oscillator buffer output
Wide band AGC sensitivity
VSMAM-1
No input
VSMAM-2
1MHz, 130dBμ, unmodulated
VOSCBUFF-AM1 No input, the pin 15 output
W-AGCsen1 1.4MHz, the input when V46 = 0.7V
0.0
0.2
0.5
V
3.5
4.4
6.1
V
185 230
mVrms
92
98 104 dBμ
W-AGCsen2 1.4MHz, the input when V46 = 0.7V (seek mode)
83
89
95 dBμ
SD sensitivity
IF buffer output
SD-sen1AM
1MHz, the ANT input level such that the IF counter output turns
24
30
on.
SD-sen2AM
1MHz, the ANT input level such that the SD pin goes to the on
24
30
state.
VIFBUFF-AM 1MHz, 74dBμ, unmodulated. The pin 23 output
200 290
36 dBμ
36 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 200kΩ.
*2. When the resistor between pin 58 and ground is 30kΩ.
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