U4255BM-M Datasheet, PDF (22/32 Pages) ATMEL Corporation – AM / FM RECEIVER IC

Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): V_S = 8.5 V, T_amb = 25°C.
No. Parameters
Test Conditions
Pin
Symbol Min.
Typ.
Max.
Unit
9.8 Maximum differential
output voltage FM
23, 24
1
Vpp
9.9 Input resistance
26
270
330
400
W
9.10 LO input voltage
22
80
500
mVpp
9.11 LO input resistance
22
1
kW
9.12 LO input bias voltage
22
2.8
3.0
3.2
V
10 2^nd IF Amplifier (Bit 55 = 0)
10.1 Input resistance
Pin 27 AC-grounded
28
3
kW
10.2 Maximum voltage
gain
AM/WB mode
(Bit 93 = 1)
28, 20
44
47
50
dB
10.3 Gain control range
AM/WB mode
(Bit 93 = 1)
44
dB
10.4 Maximum voltage
gain
FM mode (Bit 92 = 1,
Bit 93 = 0, Bit 54 = 0)
23, 24
20
37
dB
10.5 DC output voltage
20
3.1
3.4
3.7
V
10.6 AC output voltage
Unmodulated signal,
82 dBµV at Pin 1
20
(IF AGC active)
145
175
200 mVrms
10.7 Output impedance
Small signal
20
70
W
11 FM Demodulator Integrated Bandfilter, FM Mode (Bit 92 = 1, Bit 93 = 0), BW Setting 2^nd IF Filter = 120 kHz
11.1 AC output voltage
11.2 Stereo roll-off
Deviation = ± 75 kHz,
f_mod = 1 kHz
11
Deviation = ± 75 kHz,
f_mod = 38 kHz
11
(reference: 1 kHz)
420
480
540 mVrms
-2.3
-2.0
-1.7
dB
11.3 Total harmonic
distortion
Deviation = ± 75 kHz,
f_mod = 1 kHz
11
THD_FM
0.4
0.7
%
11.4 Maximum signal-to- Dev. = ± 22.5 kHz,
noise ratio
f_mod = 1 kHz, 50 µs
de-emphase, signal
11
(S/N)_FM
62
65
dB
input at 450 kHz
12 Soft Mute, FM Mode (Bit 92 = 1, Bit 93 = 0, Bit 80 = 0)
12.1 Mute gain
Bit 67 = 0,
V (Pin 34) = 2 V
11
-31
-28
-26
dB
12.2 Mute gain
Bit 67 = 1,
V (Pin 34) = 2 V
11
-26
-24
-22
dB
12.3 Soft mute threshold
Bits 89-91 = 0,
Bits 68-70 = 1
1
50
53
56
dBµV
13 AM Demodulator, AM Mode (Bit 92 = 0, Bit 93 = 1)
13.1 AC output voltage
13.2 Total harmonic
distortion
Modulation depth =
80%, f_mod = 1 kHz
Modulation depth =
80%, f_mod = 1 kHz,
V(Pin 35) = const.
11
350
400
450 mVrms
11
THD_AM
0.6
2
%
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Type*
D
D
D
D
A
D
A
D
D
A
A
D
A
A
A
A
A
A
B
A
A
22 U4255BM-M
4519C–AUDR–07/02