3848 datasheet(2/3 Pages) ALLEGRO

Part #	3848

Description	DUAL-CONVERSION AM RECEIVER

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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3848

DUAL-CONVERSION AM RECEIVER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

Limits

Characteristic

Symbol

Test Conditions

Min

Typ

Max

Units

Supply Current

ICC

I2, Vin = 0

—

50

65

mA

I2, Vin = 0, V27 = 0 (Muted)

—

1.0

6.0

mA

Sensitivity

Vin

Vout = 50 mV

—

6.0

10

µV

Usable Sensitivity

Vin

S + N/N = 20 dB

—

14

21

µV

Recovered Audio

Vout

165

215

265

mV

Total Harmonic Dist.

THD

Mod = 90%

—

0.4

2.0

%

Oscillator Output

Vo

V17

80

120

—

mV

Stop Output Voltage

VSTP

V8, Vin = 0

4.7

5.0

—

V

V8, Mod = 0%

—

0.10

0.16

V

Stop Sensitivity

Vstp

V12 = 2.5 V, Mod = 0%

30

45

60

µV

Stop Bandwidth

BWSTP

V8 = 2.5 V, = 0%

5.0

6.5

8.0

kHz

Wide-Band AGC

VAGC

Vin = 0

5.0

6.7

8.0

V

Vin = 11 mV, Mod = 0%

3.7

5.0

—

V

Vin = 26 mV, Mod = 0%

—

1.0

V

VFSI

Vin = 0

—

0.1

0.4

V

Vin = 30 µV, Mod = 0%

0.25

0.60

1.05

V

Vin = 100 µV, Mod = 0%

1.1

1.6

2.2

V

Vin = 1 mV, Mod = 0%

1.8

2.5

3.2

V

Vin = 10 mV, Mod = 0%

3.1

3.7

4.4

V

VFSI

Vin = 0

—

0.5

V

Vin = 30 µV, Mod = 0%

0.9

1.1

1.5

V

Vin = 100 µV, Mod 0%

1.3

1.6

2.0

V

Vin = 1 mV, Mod = 0%

2.3

2.9

3.5

V

Vin = 10 mV, Mod = 0%

2.5

3.7

4.0

V

Overload

Vin

Vout = 3% THD, Mod = 90%

60

100

—

mV

First Mixer (Note 2)

350

450

—

mV

-3dB Limiting

Vin

Mod = 3 kHz peak deviation

—

12

—

µV

IF Output Voltage

Vout

Vin = 1 mV

200

250

320

mV

FM Recovered Audio

Vout

V7, Mod = 3 kHz peak deviation

—

380

—

mV

Signal to Noise Ratio

S+N/N

Vin = 1 mV

50

53

—

dB

Vin = 10 mV

53

56

—

dB

AGC Figure of Merit

FOM

Ref. at Vin = 10 mV, Vin for Vout = -10 dB

7.0

10

14

µV

ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 10 V, fo = 1 MHz, fif1 = 10.7 MHz,

fif2 = 450 kHz, Vin = 10 mV; fm = 1 kHz , Mod = 30% (except as noted).

Field-Strength

Indicator

Output Voltage

(unmodulated,

AGC Reset Low)

Field-Strength

Indicator

Output Voltage

(unmodulated,

AGC Reset High)

Continued next page...

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