ATR4258 Datasheet, PDF (26/38 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
9.11 LO input resistance
22
1
kΩ
9.12 LO input bias voltage
10 2^nd IF Amplifier (Bit 55 = 0)
22
2.8
3.0
3.2
V
10.1 Input resistance
Pin 27 AC-grounded
28
3
kΩ
10.2 Voltage gain
AM/WB mode
(Bit 93 = 1)
Pin 28 1 mVrms
28, 20
42
45
48
dB
10.3 Gain control range
AM/WB mode
(Bit 93 = 1)
47
dB
10.4 DC output voltage
20
3.4
3.7
4.0
V
Unmodulated signal,
10.5 AC output voltage
82 dBµV at pin 1
(IF AGC active)
20
Bit 93 = 1
150
180
230 mVrms
10.6 Output impedance
Small signal
20
70
Ω
11 FM Demodulator Integrated Band-filter, FM Mode (Bit 92 = 1, Bit 93 = 0), BW Setting 2^nd IF Filter = 120 kHz
11.1 AC output voltage
Deviation = ±75 kHz,
f_mod = 1 kHz
11
Deviation = ±75 kHz,
11.2 Stereo roll-off
f_mod = 38 kHz
11
(reference: 1 kHz)
420
480
540 mVrms
-2.0
dB
11.3
Total harmonic
distortion
Deviation = ±75 kHz,
f_mod = 1 kHz
11
THD_FM
Dev. = ±22.5 kHz,
11.4
Maximum signal-to-
noise ratio
f_mod = 1 kHz, 50 µs
de-emphase, signal
11
(S/N)_FM
input at 450 kHz
0.4
0.7
%
65
dB
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
-28
-26
-24
dB
12.2 Mute gain
Bit 67 = 1,
V (pin 34) = 2 V
11
-24
-22
-20
dB
13 AM Demodulator, AM Mode (Bit 92 = 0, Bit 93 = 1)
13.1 AC output voltage
13.2
Total harmonic
distortion
Modulation depth =
30%, f_mod = 1 kHz
Modulation depth =
80%, f_mod = 1 kHz
V(pin 35) = const.
11
135
150
170 mVrms
11
THD_AM
0.6
2
%
13.3
Maximum
signal-to-noise ratio
Modulation depth =
30%, f_mod = 1 kHz
74 dBµV at pin 41
11
(S/N)_AM
54
dB
14 MPX Output
14.1 DC output voltage
Bit 7 = 1
11
2.1
2.3
2.5
V
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Type*
D
A
D
A
D
A
A
D
B
D
A
C
A
A
A
A
C
A
26 ATR4258
4838A–AUDR–10/04