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8. Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): V S = 8.5V, T amb = 25°C
No.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
10
2
nd
IF Amplifier (Bit 55 = 0)
10.1
Input resistance
Pin 27 AC-grounded
28
3
k Ω
D
AM/WB mode
10.2
Voltage gain
(Bit 93 = 1)
28, 20
42
45
48
dB
A
Pin 28 1 mVrms
10.3
Gain control range
AM/WB mode
(Bit 93 = 1)
47
dB
D
10.4
DC output voltage
20
3.4
3.7
4.0
V
A
Unmodulated signal,
10.5
AC output voltage
82 dBμV at pin 1
(IF AGC active)
20
150
180
230
mVrms
A
Bit 93 = 1
10.6
Output impedance
Small signal
20
70
Ω
D
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
420
480
540
mVrms
B
Deviation = ±75 kHz,
11.2
Stereo roll-off
f mod = 38 kHz
11
–2.0
dB
D
(reference: 1 kHz)
11.3
Total harmonic
distortion
Deviation = ±75 kHz,
f mod = 1 kHz
11
THD FM
0.4
0.7
%
A
Dev. = ±22.5 kHz,
11.4
Maximum
signal-to-noise ratio
f mod = 1 kHz, 50 μs de-
emphase, signal input
11
(S/N) FM
65
dB
C
at 450 kHz
12
Soft Mute, FM Mode (Bit 92 = 1, Bit 93 = 0, Bit 80 = 0)
12.1
12.2
Mute gain
Mute gain
Bit 67 = 0,
V (pin 34) = 2V
Bit 67 = 1,
V (pin 34) = 2V
11
11
–28
–24
–26
–22
–24
–20
dB
dB
A
A
13
AM Demodulator, AM Mode (Bit 92 = 0, Bit 93 = 1)
13.1
13.2
13.3
AC output voltage
Total harmonic
distortion
Maximum
signal-to-noise ratio
Modulation depth =
30%, f mod = 1 kHz
Modulation depth =
80%, f mod = 1 kHz
V(pin 35) = const.
Modulation depth =
30%, f mod = 1 kHz
74 dBμV at pin 41
11
11
11
THD AM
(S/N) AM
135
150
0.6
54
170
2
mVrms
%
dB
A
A
C
14
MPX Output
14.1
DC output voltage
Bit 7 = 1
11
2.1
2.3
2.5
V
A
Bit 7 = 1,
14.2
Mute gain
FM dev. = ±75 kHz,
11
–65
–50
dB
A
f mod = 1 kHz
14.3
Output resistance
Small signal
11
60
Ω
D
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
26
ATR4258
4838B–AUDR–05/05
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