Ratings

Parameter

Symbol

Conditions

min

typ

max

unit

[FM FE Mixer Input

N-AGC on input

83 MHz, unmodulated.

81

88

95

dBµ

The input such that the pin 2 voltage is 2.0 V or below

W-AGC on input

83 MHz, unmodulated. The input such that the pin 2

104

110

116

dBµ

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

19

30

48

mVrms

Oscillator buffer output

No input

85

110

165

mVrms

[NC Block] NC input (pin 30)

Gate time

τGATE1

f = 1 kHz, for a 1-µs, 100-mV p-o pulse

55

µs

Noise sensitivity

SN

The level of a 1 = kHz, 1-µs 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-µs 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

20

dB

Detector output

130

195

270

mVrms

Pin 31 detector output

110

175

230

mVms

AGC F.O.M.

1 MHz, 74 dBµ, referenced to the output, the input amplitude

51

56

61

dB

such that the output falls by 10 dB. Pin 15

Signal-to-noise ratio

S/N-AM

47

52

dB

Total harmonic distortion

THD-AM

0.3

1

%

Signal meter output

No input

0.0

0.2

0.5

V

1 MHz, 130 dBµ, unmodulated

4.8

6

7.3

V

Oscillator buffer output

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

dBµ

W-AGCsen2

1.4 MHz, the input when V46 = 0.7 V (seek mode)

83

89

95

dBµ

SD sensitivity

SD-sen1 AM

1 MHz, the ANT input level such that the IF counter output turns on.

24

30

36

dBµ

SD-sen2 AM

1 MHz, the ANT input level such that the SD pin goes to the on state.

24

30

36

dBµ

IF buffer output

1 MHz, 74 dBµ, unmodulated. The pin 23 output

200

290

mVrms

No. 6655-3/54

LA1787M

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

Ω.

* 2. When the resistor between pin 58 and ground is 30 k

Ω.

Continued from preceding page.