u4255bm ATMEL Corporation, u4255bm Datasheet - Page 4

• Manufacturer Part Number: u4255bm
• Description: Am/fm Receiver
• Manufacturer: ATMEL Corporation

Electrical Characteristics (continued)
Test conditions (unless otherwise specified): V
For AC parameters: fi
U4255BM
2nd IF Amplifier
Input resistance
IF preamplifier gain
Preamplifier control range
Oscillator (Pin 15, GND, connected to external oscillator components)
Oscillator range
Frequency range
Harmonics
Output resistance
FM Mixer
Third order intercept point
Conversion transconductance
Noise figure
Input resistance
Input capacitance
Input 1 resistance to ground
Input 1 capacitance to ground f = 100 MHz
Input 2 resistance to ground
Input 2 capacitance to ground f = 100 MHz
Output capacitance to GND
1st IF FM Amplifier
Digitally adjustable gain
Input resistance
Output resistance
Temperature coefficient of
the gain at G
Temperature coefficient of
the gain at G
FM Demodulator
Output voltage
Total distortion
4 (12)
Parameters
min
max
RF
(450 kHz)
= 100 MHz, Rg = 50 W , f
(Pin 11)
Rg (Pin 13) = 220 W,
Q of Losc = 70,
RL1 = 520 W
Load impedance:
R
f = 100 MHz
f = 100 MHz
Pins 43, 44
3 bit, 10.7 MHz
G
G
v
f = 450 kHz
Deviation = ± 22.5kHz,
f
Bandwidth 2nd IF filter
= 120 kHz,
deviation = 75 kHz
MOD
iPin 23, 24
L43, 44
min
max
Test Conditions / Pins
, Bit 66 = 0
, Bit 66 = 1
= 1 kHz
= 200 W
= 40 mV
Pins 28 to 20
Pins 1 to 2
Pins 1 to 2
S
= 8.5 V, T
MOD
Pin 28
Pin16
Pin 16
Pin 1
Pin 1
Pin 2
Pin 2
Pin 38
Pin 30
= 0.4 kHz, ∆f = " 75 kHz, f
amb
= 25°C
C
VLObuf
Symbol
VLOB
TK
VLOE
TK
NF
o 43, o44
R
C
v
G
G
f
R
R
R
IP3
OSC
R
C
R
C
MPX
R
g
i 1, 2
i 1, 2
G
max
min
o30
LO
i38
max
i1
i1
i2
i2
c
dsb
min
i
Min.
70
70
IF
= 450 kHz, reference point Pin 4
0.044
0.039
Typ.
160
100
120
330
330
140
1.6
1.2
1.6
0.3
43
37
90
70
10
19
30
3
7
5
9
7
5
Rev. A1, 26-Jun-00
Max.
220
160
–15
dBmV
mA/v
dB/K
dB/K
MHz
Unit
dBc
mV
mV
mV
mV
kW
kW
kW
kW
dB
dB
dB
dB
dB
pF
pF
pF
pF
%
W
W
W