T4258-ILQ [ATMEL]

AM/FM Receiver IC; AM / FM接收器IC
T4258-ILQ
型号: T4258-ILQ
厂家: ATMEL    ATMEL
描述:

AM/FM Receiver IC
AM / FM接收器IC

消费电路 商用集成电路 接收器集成电路 光电二极管 信息通信管理
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T4258  
AM/FM Receiver IC  
Description  
The T4258 is an integrated AM/FM frontend circuit in can be built together with the PLL U4256BM. This ICs  
BICMOS technology. It contains a double conversion are designed for high performance car radio applications.  
system for FM and an up-/down conversion circuit for  
AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete  
automatically aligned high performance AM/FM tuner  
Electrostatic sensitive device.  
Observe precautions for handling.  
FD eRaetcueirveinsg condition analyzer  
D Soft mute and multipath noise cancellation  
D AM up-/down conversion system  
D AM stereo capability  
D Integrated band filter for 2nd IF;  
with software controlled bandwidth  
D Pin compatible with U4255BM  
D FM-double conversion system  
D Stop signal generation for AM and FM  
D Automatic alignment possible  
D 3-wire bus controlled  
D World tuner, US Weatherband, J-band  
D Completely integrated FM demodulator  
Block Diagram  
V3  
IF1OUT MX2IN  
IF1FMI  
38  
IF1AMI  
33  
MX2OB  
IF1REF  
39  
MX1OA MX1OB  
MX2OA IF2IN V3P  
44  
43  
29  
24  
28  
27  
30  
26  
23  
AM  
AM  
Dem.  
OPLPF  
32  
FM  
41  
IFAGCL  
IFAGCH  
AGC  
MX1AMA  
MX1AMB  
36  
35  
AM  
3
7
V3  
AMAGC  
AMVREG  
AMPLPF  
AGC  
IF2OUT  
FILADJ  
6
8
Noise–  
blanker  
20  
37  
Automatic  
Adjustment  
AGC  
MX1FMA  
MX1FMB  
GNDMX  
1
FM  
Multi–  
path  
MULTIP  
MPX  
2
4
40  
Divider  
2...10  
OSCOUT  
Offset  
FM  
Dem.  
Soft  
Mute  
16  
Adj.  
Chan.  
Stop  
11  
Divider  
OSC  
GNDOSC  
OSCE  
15  
14  
13  
V3  
Bandgap  
Dev.  
Ana.  
Bus  
INT  
21  
INT  
OSCB  
22  
10  
34  
31  
DEV  
19  
DATA METER  
12 25 42  
5
17 18  
EN  
9
V57  
VS  
MX2LO ADJAC  
SMUTE  
GND  
FMAGC  
CLK  
Figure 1. Block diagram  
Ordering Information  
Extended Type Number  
Package  
Remarks  
T4258-ILQ  
SSO44  
SSO44  
Taped and reeled  
Tube  
T4258-ILS  
Rev. A1, 10-Jan-01  
1 (17)  
T4258  
Pin Description  
Pin  
Symbol  
Function  
1
2
MX1OB  
43 MX1OA  
44  
MX1FMA  
MX1FMB  
MX1AMB  
GNDMX  
FMAGC  
1
MX1FMA 1st mixer FM input A  
MX1FMB 1st mixer FM input B  
MX1AMB 1st mixer AM input B  
GNDMX Ground 1st mixer  
2
3
4
3
VS  
42  
41  
40  
39  
38  
37  
5
FMAGC  
FM preamplifier AGC  
6
AMVREG AM control voltage  
AMAGC AM preamplifier AGC  
AMPLPF AM AGC LP filter  
4
MX1AMA  
MULTIP  
IF1REF  
IF1FMI  
FILADJ  
IFAGCL  
IFAGCH  
SMUTE  
IF1AMI  
OPLPF  
DEV  
7
8
5
9
METER  
ADJAC  
MPX  
Fieldstrength output  
Adjacent channel detection output  
Multiplex signal  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
6
AMVREG  
AMAGC  
V57  
5.7 V reference voltage  
Oscillator basis  
7
OSCB  
OSCE  
Oscillator emitter  
8
AMPLPF  
METER  
ADJAC  
MPX  
GNDOSC Oscillator ground  
OSCOUT Oscillator output  
9
36  
35  
34  
33  
32  
31  
30  
29  
EN  
3-wire bus enable  
CLK  
3-wire bus clock  
10  
11  
12  
13  
14  
DATA  
IF2OUT  
INT  
3-wire bus data  
2nd IF amplifier output  
Interrupt, stop signal, test out  
10.25 MHz input for 2nd mixer  
2nd mixer output B  
MX2LO  
MX2OB  
MX2OA  
GND  
V57  
2nd mixer output A  
OSCB  
OSCE  
Ground  
MX2IN  
V3P  
2nd mixer input  
3 V ref. for AMPIN, AMIFAGC, Control, IF2IN  
2nd IF amplifier input  
3 V reference for IF1OUT, MX2IN  
1st IF amplifier output  
Deviation detect output  
Operating point LPF  
IF2IN  
IF1OUT  
V3  
GNDOSC 15  
V3  
IF1OUT  
DEV  
16  
OSCOUT  
EN  
28 IF2IN  
OPLPF  
IF1AMI  
SMUTE  
17  
18  
19  
20  
1st IF AM amplifier input  
Soft MUTE control input  
27  
26  
25  
V3P  
CLK  
IFAGCH IF AGC LP filter high time constant constant  
MX2IN  
GND  
DATA  
IF2OUT  
IFAGCL  
FILADJ  
IF1FMI  
IF1REF  
IF AGC LP filter low time constant  
Filter adjust  
1st IF FM amplifier input  
1st IF & MX1OUT ref., MX1AMA, MX1AMB  
INT 21  
22  
24 MX2OA  
MULTIP Multipath detection output  
41 MX1AMA 1st mixer AM input A  
23  
MX2OB  
MX2LO  
42  
43  
44  
VS  
Supply voltage  
MX1OA  
MX1OB  
1st mixer output A  
1st mixer output B  
Figure 2. Pinning SSO44  
2 (17)  
Rev. A1, 10-Jan-01  
T4258  
Absolute Maximum Ratings  
All voltages are referred to GND (Pin 25)  
Parameter  
Symbol  
Value  
10  
Unit  
V
Supply voltage  
Pin 42  
V
S
Power dissipation  
P
tot  
1,0  
W
Junction temperature  
T
150  
°C  
°C  
°C  
j
Ambient temperature range  
Storage temperature range  
T
amb  
–40 to +85  
–50 to +150  
T
stg  
Operating Range  
All voltages are referred to GND (Pin 25)  
Parameter  
Symbol  
Min.  
8
Typ.  
Max.  
Unit  
V
Supply voltage range  
Pin 42  
V
S
8.5  
10  
85  
Ambient temperature  
T
amb  
–40  
°C  
Thermal Resistance  
Parameter  
Symbol  
Value  
Unit  
K/W  
Junction ambient  
soldered to PCB  
R
t.b.d.  
thJA  
Electrical Characteristics  
Test conditions (unless otherwise specified): V = +8.5 V, T  
= +25°C  
S
amb  
for AC parameters: fi = 1 MHz, Rg = 50 W, f  
= 0.4 kHz, m = 0.3, f = 450 kHz, reference point Pin 4  
RF  
MOD  
IF  
Parameter  
Supply voltage  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
10  
Unit  
V
Pin 42  
Pin 42  
V
S
8.5  
Supply current  
I
100  
mA  
S
AM RF AGC  
AGC threshold Mixer Input  
(2 bit)  
91  
94  
97  
dbµV  
dbµV  
dbµV  
dbµV  
100  
AM LO divider  
Programmable divider  
AM Mixer (10.7 MHz)  
DC supply current  
(3 bit)  
N
2
10  
Pin 43 + 44  
Pins 43, 44  
Pin 41  
17  
mA  
Conversion conductance  
io /vi  
if rf  
S
m1  
4.1  
mA/V  
Maximum IF output  
Vo  
8
V
pp  
IF  
Input intercept point 3rd  
order  
IP3  
133  
dBµV  
Input resistance  
10 MHz  
13  
kW  
Rev. A1, 10-Jan-01  
3 (17)  
T4258  
Electrical Characteristics (continued)  
Test conditions (unless otherwise specified): V = +8.5 V, T  
= +25°C  
S
amb  
for AC parameters: fi = 1 MHz, Rg = 50 W, f  
= 0.4 kHz, m = 0.3, f = 450 kHz, reference point Pin 4  
RF  
MOD  
IF  
Parameter  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
Unit  
AM-1st IF Amplifier (10.7 MHz)  
Input resistance  
Pin 33  
Ri  
G
100  
15  
kW  
dB  
IF preamplifier gain  
R = 330 W  
L
Pins 33 to 30  
Preamplifier control range  
26  
dB  
Output intercept point 3rd  
order  
IP3  
F
137  
dBµV  
Noise figure  
10  
dB  
Mixer 2 (450 kHz)  
DC supply current  
Conversion conductance  
Pin 23 + 24  
Pins 23, 24  
10  
2
mA  
S
mA/V  
m2  
io /vi  
if2 if1  
Maximum IF output  
Output impedance  
Vo  
8
V
pp  
IF  
Pin 23 – GND  
Pin 24 – GND  
R
C
1
3
MW  
pF  
o
o
Input intercept point 3rd  
order  
IP3  
133  
dBµV  
Input resistance  
R
330  
W
i
2nd IF Amplifier (450 kHz)  
Input resistance  
Pin 28  
R
3
kW  
dB  
dB  
i
IF preamplifier gain  
Preamplifier control range  
IF2 Output (Pin 20)  
Output level  
Pin 28 to 20  
G
53  
47  
200  
mV  
Oscillator  
Oscillator amplitude  
R (Pin 13) = 220 W,  
V
V
160  
100  
90  
mV  
mV  
mV  
g
LOB  
LOE  
Q of L = 70  
osc  
V
LObuf  
70  
70  
220  
260  
–15  
Frequency range  
Harmonics  
f
MHz  
dBc  
W
OSC  
Pin 16  
Pin 16  
Output resistance  
R
70  
LObuf  
Programmable oscillator  
divider  
Range  
Nosc  
1
3
FM Europe  
FM Japan  
AM  
2
3
2
WB  
1.5  
4 (17)  
Rev. A1, 10-Jan-01  
T4258  
Electrical Characteristics  
Test conditions (unless otherwise specified): V = +8.5 V, T  
= +25°C, for AC parameters: fi = 100 MHz,  
RF  
S
amb  
Rg = 50 W, f  
= 0.4 kHz, Df = ±75 kHz, f = 450 kHz, reference point Pin 4  
MOD  
IF  
Parameter  
FM AGC  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
Unit  
AGC threshold mixer input  
(2 bit)  
Vmixin  
85  
90  
95  
dBµV  
dBµV  
dBµV  
dBµV  
103  
AGC threshold mixer output  
Vmix-  
out  
t.b.d.  
t.b.d.  
dBµV  
AGC threshold IF amp. out  
FM Mixer  
Vif1out  
dBµV  
Conversion transconductance  
3rd order intercept point  
g
7
mA/V  
c
Load impedance:  
= 200 Ω  
IP3  
125  
dBµV  
R
L43, 44  
Noise figure  
NF  
10  
dB  
dsb  
Input resistance  
Pin 1 to 2  
Pin 1 to 2  
Pin 1  
R
C
kΩ  
pF  
i 1, 2  
i 1, 2  
Input capacitance  
5
9
Input 1 resistance to ground  
f = 100 MHz  
f = 100 MHz  
R
kΩ  
pF  
i1  
i1  
Input 1 capacitance to  
ground  
Pin 1  
C
Input 2 resistance to ground  
f = 100 MHz  
f = 100 MHz  
Pin 2  
Pin 2  
R
C
kΩ  
i2  
i2  
Input 2 capacitance to  
ground  
7
5
pF  
Output capacitance to GND  
Pins 43, 44  
C
pF  
o 43,  
C
o 44  
1st IF FM Amplifier  
Digitally adjustable gain  
3 bit, 10.7 MHz  
G
20  
30  
dB  
dB  
min  
G
max  
Input resistance  
Pin 38  
Pin 30  
R
330  
330  
i 38  
Output resistance  
R
o 30  
Temperature coefficient of  
the gain  
Bit 66 = 0  
Bit 66 = 1  
TK1  
dB/K  
Temperature coefficient of  
the gain  
TK2  
dB/K  
Noise figure  
F
t.b.d.  
130  
dB  
Output intercept point 3rd  
order  
IP3  
dBµV  
Rev. A1, 10-Jan-01  
5 (17)  
T4258  
Electrical Characteristics (continued)  
Test conditions (unless otherwise specified): V = +8.5 V, T  
= +25°C, for AC parameters: fi = 100 MHz,  
RF  
S
amb  
Rg = 50 W, f  
= 0.4 kHz, Df = ±75 kHz, f = 450 kHz, reference point Pin 4  
MOD  
IF  
Parameter  
FM Demodulator (Pin 11)  
Output voltage  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
Unit  
V
= 40 mV  
V
MPX  
,
150  
mV  
iPin 23, 24  
f = 450 kHz  
Pin 11  
Deviation = ± 22.5kHz,  
f
= 1 kHz  
MOD  
Signal-to-noise related to  
22.5 kHz dev.  
Bandwidth = 30 Hz .. 20 kHz  
Deemphasis 50 µs  
S/N  
60  
dB  
%
Total distortion  
Bandwidth 2nd IF filter =  
120 kHz  
0.3  
WB Demodulator (Pin 11)  
Output voltage  
Bit 71 = 0, Bit 72 = 1  
V
Pin 11  
,
165  
3.5  
mV  
%
MPX  
V
= 40 mV  
iPin 23, 24  
f = 450 kHz  
Deviation = ± 2.5 kHz,  
f
= 1 kHz  
MOD  
Total distortion  
Bandwidth 2nd IF filter =  
30 kHz  
Fieldstrength Output (Pin 10) (Bit 80 = 0)  
Range  
85  
5
dB  
V
Max. output voltage  
Steepness  
50  
mV/dB  
Integrated IF filter  
Bandwidth  
FM (4 bit)  
WB (4 bit)  
50  
20  
200  
100  
kHz  
kHz  
Centerfrequency adjust  
MPX Lowpass  
Bandwidth  
–43  
+43  
kHz  
Bit 79 = 0  
Bit 79 = 1  
90  
180  
kHz  
kHz  
Stopsignal Generator  
Stop Window  
± 0.5  
± 80  
kHz  
6 (17)  
Rev. A1, 10-Jan-01  
T4258  
Electrical Characteristics (continued)  
Parameter  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
Unit  
3–wire bus, ENABLE, Clock, DATA  
Pins 17, 18, 19  
Input voltage  
High  
LOW  
V
BUS  
V
BUS  
2.0  
V
V
1.0  
1.0  
Clock frequency  
MHz  
Period of CLK  
High  
Low  
t
t
250  
250  
ns  
ns  
H
L
Rise time EN, DA, CLK  
Fall time EN, DA, CLK  
Set-up time  
t
400  
100  
ns  
ns  
ns  
ns  
ns  
R
t
t
F
S
100  
250  
0
Hold time EN  
t
HEN  
HDA  
Hold time DA  
t
Bus Timing  
t
R
t
F
Enable  
Data  
t
t
HEN  
S
t
F
t
R
tHDA  
t
S
t
R
t
F
Clock  
t
H
t
L
96 11826  
Figure 3. Bus timing  
Rev. A1, 10-Jan-01  
7 (17)  
T4258  
Data Transfer  
A24_100  
MSB  
BYTE3  
LSB MSB  
BYTE2  
LSB MSB  
BYTE1  
LSB  
ADDR. Demodulator  
Gain FM –  
IF1  
Pin21 Search stop window/  
Local OSC AM divider/ Multipath  
sensitivity  
Pin9  
Meter  
Pin11  
MPX  
LPF  
Stop signal gate time  
INT  
Noiseblanker AM  
sensitivity  
1
0
0
1=  
1=  
1=  
1=  
0=  
AM  
FM  
stop  
nband 90kHz  
B93  
B92 B91 B90 B89  
B88  
B87  
B86 B85 B84  
B83  
B82  
B81  
B80  
B79  
B78 B77 B76  
B75  
B74  
B73  
A24_101  
MSB  
BYTE3  
LSB MSB  
LSB MSB  
BYTE1  
LSB  
BYTE  
2
ADDR. WB demodu-  
lator gain  
Soft mute  
threshold  
Soft  
mute  
depth IF1  
TK  
FM  
AGC  
threshold  
AM/FM  
1st IF  
ampl.  
AM/FM +AGC  
1st  
Mixer  
Pin23/  
Pin24  
MX2O  
Int. IF2 reference shift  
Pin 20  
Pin28  
Demo-  
Gain  
local  
OSC  
IFOUT IF2IN dulator  
control  
ampl.  
AM/FM band-  
width  
1
0
1
1=  
26dB  
1=AM  
B65 B64 B63  
1=AM  
0=  
IF2out  
0=  
open  
0=  
active  
0=  
low  
B72  
B71 B70 B69 B68  
B67  
B66  
B62  
B61  
B60  
B59  
B58  
B57 B56 B55  
B54  
B53  
B52  
A24_111  
MSB  
LSB MSB  
LSB MSB  
LSB  
BYTE  
3
BYTE  
2
BYTE  
1
ADDR. Local  
OSC  
Do not  
change  
Pin 9 offset  
Bandpath filter center  
frequency  
Pin 9  
Meter  
Local OSC AGC  
prescaler (VCO(Buffer)  
AGC  
1
1
1
0
0
0
0
0
0
0
0
0
1=  
+multi  
B30  
B29 B28 B27 B26  
B25  
B24  
B23 B22 B21  
B20  
B19  
B18  
B17  
B16  
B15 B14 B13  
B12  
B11  
B10  
A8_100  
MSB  
BYTE 1  
LSB  
ADDR.  
Test–  
mode  
Multipath  
noise  
cancellation  
Pin 11  
MPX  
OUT  
Pin 40/10  
Reset  
Noise  
blanker  
AM  
1
0
0
0
0=on  
B8  
1=Mute  
B7  
0
1=on  
B5  
B9  
B6  
A8_101  
MSB  
BYTE 1  
Bandpath filter Band width  
LSB  
ADDR.  
Pin 21 INT  
1
0
1
1= ON  
B4  
B3  
B2  
B1  
B0  
8 (17)  
Rev. A1, 10-Jan-01  
T4258  
Pulse Diagram  
8-bit command  
EN  
DATA  
CLK  
LSB  
BYTE 1  
MSB  
16-bit command  
EN  
DATA  
CLK  
LSB  
BYTE 1  
MSB LSB  
BYTE 2  
MSB  
24-bit command  
EN  
DATA  
CLK  
LSB  
MSB  
LSB  
BYTE 1  
BYTE 2  
MSB LSB  
BYTE 3  
MSB  
Figure 4. Pulse diagram  
Bus Control  
The operating mode is set by the bits 92 and 93  
Bit 88 switches the search mode on/off  
Station search  
Receive  
Bit 88  
AM/ FM/ Weather Channel  
Bit 93  
Bit 92  
0
1
Standby  
FM  
0
0
1
1
0
1
0
1
Search  
AM  
Weather band  
Bits 85 to 87 select the the search-stop deviation from the  
center frequency ans AM noiseblanker sensitivity  
The bits 89 to 91 control the gain of the FM IF amplifier  
AM Noise-  
blanker  
Sensitivity window +  
Search-  
stop  
Bit 87 Bit 86 Bit 85  
Gain FM-IF  
19 dB  
Bit 91 Bit 90 Bit 89  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Low  
0.5 kHz  
1.1 kHz  
2.3 kHz  
4.8 kHz  
10 kHz  
20 kHz  
40 kHz  
80 kHz  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
21 dB  
23 dB  
25 dB  
Normal  
27 dB  
28 dB  
29 dB  
30 dB  
High  
Rev. A1, 10-Jan-01  
9 (17)  
T4258  
In AM mode (Bits 92, 93), Bits 81 to 84 set the divide Bit 80 and Bit 13 switches between narrow band field  
factor of the AM divider  
strength information and wide band field strength  
information  
Divider  
AM Mixer 1  
Bit Bit Bit Bit Bit Bit  
Field strength  
narrow band / wide band  
Bit  
80  
Bit  
13  
93  
1
1
1
1
1
1
1
1
1
92  
0
0
0
0
0
0
0
0
0
84  
1
0
0
0
0
0
0
0
0
83  
X
1
82  
X
1
81  
X
1
Divide by 10  
Divide by 9  
Divide by 8  
Divide by 7  
Divide by 6  
Divide by 5  
Divide by 4  
Divide by 3  
Divide by 2  
FM field strength (wide band)  
0
0
1
1
0
1
Wide Band + Multipath fieldstrength  
1
1
0
AM field strength from AGC  
(narrow band)  
1
0
1
1
0
0
Narrow band + Multipath fieldstrength  
1
0
0
1
1
0
1
0
0
0
1
Bit 79 controls the band width of the low pass filter of the  
MPX output  
0
0
0
Band Width MPX Low Pass Filter  
Bit 79  
90 kHz  
0
1
180 kHz  
In FM mode and in weather band mode (Bit 92, 93), the  
Bits 81 to 84 set the multipath sensitivity  
Sensitivity  
Multipath  
Bit Bit Bit Bit Bit Bit  
The stop counter calculates an average center frequency  
during the time which is set by the bits 73 to 78  
93  
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
92  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
84  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
83  
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
82  
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
81  
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Off  
Time Window  
Bit Bit Bit Bit Bit Bit  
Low  
for Stop Signal 78 77 76 75 74 73  
3.1969 ms  
1 x 3.1969 ms  
...  
0
0
0
0
0
0
0
0
0
0
0
1
63 x 3.1969 ms  
1
1
1
1
1
1
Normal  
The demodulator gain for the weather band mode is set by  
the bits 71 and 72  
Demodulator Gain in  
Weather Band Mode  
Bit 72  
Bit 71  
5 x  
7.5 x  
10 x  
15 x  
0
0
1
1
0
1
0
1
High  
10 (17)  
Rev. A1, 10-Jan-01  
T4258  
For soft mute, the MPX signal level will be reduced Bits 60 and 61 controls the band width of the 2nd-mixer  
depending on the input signal strength. Bits 68 to 70 set output tank, in FM mode  
the input signal field strength, at which the MPX signal  
will be reduced by 3 dB (for soft mute). The setting of  
fieldstrength offsett (Bit 18 ... 21) has also influence of the  
soft start.  
FM Band Width Mixer 2  
150 kHz  
Bit 61  
Bit 60  
0
0
1
1
0
1
0
1
200 kHz  
Start Soft Mute  
0 dB  
Bit 70  
Bit 69  
Bit 68  
250 kHz  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
450 kHz  
1 dB  
2 dB  
Bit 62 select which 1st mixer and AGC stage in active  
3 dB  
4 dB  
Bit 62  
5 dB  
FM mixer + FM AGC active  
AM mixer + AM AGC active  
0
1
6 dB  
7 dB  
Bit 63 controls which 1st IF amplifier is active  
Bit 67 sets the maximum reduction of the MPX signal  
level  
Bit 63  
Max. Value of Soft Mute  
Bit 67  
1st FM – IF amplifier active  
1st AM – IF amplifier active  
0
1
30 dB  
26 dB  
0
1
Setting of the internal second IF reference shift  
Bit 59 Bit 58 Bit 57 Bit 56  
Temperature coefficient setting of FM IF–amplifier  
Temperature Coefficient (TC)  
of the IF Amplifier  
Bit 66  
IF Offset  
+ 0.00 kHz  
+ 6.25 kHz  
+ 12.50 kHz  
+ 18.75 kHz  
+ 25.00 kHz  
+ 31.25 kHz  
+ 37.50 kHz  
+ 43.75 kHz  
– 0.00 kHz  
– 6.25 kHz  
– 12.50 kHz  
– 18.75 kHz  
– 25.00 kHz  
– 31.25 kHz  
– 37.50 kHz  
– 43.75 kHz  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
TK 1  
TK 2  
0
1
Level control of the FM / WB – AGC threshold  
FM AGC Threshold  
103 dBµV  
Bit 65 Bit 64 Bit 62  
0
0
1
1
0
1
0
1
0
0
0
0
97 dBµV  
92 dBµV  
85 dBµV  
Level control of AM-AGC threshold  
AM Control Start  
91dBµV  
Bit 65  
Bit 64  
Bit 62  
0
0
1
1
0
1
0
1
1
1
1
1
94 dBµV  
97 dBµV  
100 dBµV  
Rev. A1, 10-Jan-01  
11 (17)  
T4258  
Function of Pin 20 setting is done by Bit 55  
Setting of the fieldstrenght offset (Output Pin 9)  
Offset Field- Bit 21 Bit 20  
strenght  
Bit 19 Bit 18  
Pin 20: IF out / Field Strength  
for Multipath  
Bit 55  
0.0 dB  
0.5 dB  
1.0 dB  
1.5 dB  
2.0 dB  
2.5 dB  
3.0 dB  
3.5 dB  
4.0 dB  
4.5 dB  
5.0 dB  
5.5 dB  
6.0 dB  
6.5 dB  
7.0 dB  
7.5 dB  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2nd IF output  
0
1
Multipath field strength  
Band filter, in FM mode  
2nd IF Filter  
Internal filter  
Bit 54  
0
1
External + internal filter  
Setting Bit 53 controls the demodulator in FM/ WB mode.  
Demodulator Control  
FM fine tuning OFF (default)  
WB fine tuning  
Bit 53  
1
0
Setting Bit 52 controls the gain of the local oscillator.  
Local Oscillator  
Low gain  
Bit 52  
0
1
Setting Bit 17 controls the center frequency OFFSET of  
the integrated bandpath filter’s center frequency.  
High gain  
Offset Center Frequency  
Offset +  
Bit 17  
Bit 30 controls the oscillator AGC  
0
1
Offset –  
Oscillator AGC  
AGC of (default)  
AGC on  
Bit 30  
0
1
Setting the OFFSET of the integrated bandpath filter  
center frequency.  
Offset Center  
Frequency  
Bit 17 Bit 16 Bit 15 Bit 14  
0.00 kHz  
6.25 kHz  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
12.50 kHz  
18.75 kHz  
25.00 kHz  
31.25 kHz  
37.50 kHz  
43.75 kHz  
12 (17)  
Rev. A1, 10-Jan-01  
T4258  
Setting the local oscillator prescaler (VCO/ Buffer)  
Bit 6 = 1 resets the Multipath sensor and the adjacent  
channel sensor  
Prescaler Prescaler Bit 12  
Bit 11  
Bit 10  
Sensor out (Pin 10, 40)  
Normal  
Bit 6  
VCO  
Buffer  
0
1
1
1
3
X
0
0
0
0
1
1
0
1
1
0
1
To ground  
1.5  
1.5  
2
1.5  
2
1
Bit 5 switches the AM noiseblanker ON/OFF  
X
X
AM Noiseblanker  
Bit 5  
3
3
OFF  
ON  
0
1
Setting Bit 9 (expert mode) activates test mode (B18 –  
B23 active)  
Bits 0 to 3 set the band width of the integrated 2nd IF band  
filter  
Mode  
Bit 9  
IF Bandwidth  
200 kHz  
190 kHz  
180 kHz  
170 kHz  
160 kHz  
150 kHz  
140 kHz  
130 kHz  
120 kHz  
110 kHz  
100 kHz  
90 kHz  
Bit 3 Bit 2 Bit 1 Bit 0  
Normal mode  
Test mode  
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Bit 8 = 0 activates the multipath noise canceller  
Multipath Noise  
Canceller  
Bit 8  
Active  
0
1
Not active  
Bit 7 = 1 mutes the MPX output  
Mute of MPX Output  
MPX out, Pin 11  
Mute MPX  
Bit 7  
80 kHz  
0
1
70 kHz  
60 kHz  
50 kHz  
Rev. A1, 10-Jan-01  
13 (17)  
T4258  
Test Circuit  
Figure 5. Test circuit  
14 (17)  
Rev. A1, 10-Jan-01  
T4258  
Application Board Schematic  
Figure 6. Application board schematic  
Rev. A1, 10-Jan-01  
15 (17)  
T4258  
Package Dimensions  
9.15  
8.65  
Package SSO44  
Dimensions in mm  
18.05  
17.80  
7.50  
7.30  
2.35  
0.3  
0.8  
0.25  
0.10  
0.25  
10.50  
10.20  
16.8  
44  
23  
technical drawings  
according to DIN  
specifications  
1
22  
16 (17)  
Rev. A1, 10-Jan-01  
T4258  
Ozone Depleting Substances Policy Statement  
It is the policy of Atmel Germany GmbH to  
1. Meet all present and future national and international statutory requirements.  
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems  
with respect to their impact on the health and safety of our employees and the public, as well as their impact on  
the environment.  
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as  
ozone depleting substances (ODSs).  
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid  
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these  
substances.  
Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed  
in the following documents.  
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively  
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental  
Protection Agency (EPA) in the USA  
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.  
Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances  
and do not contain such substances.  
We reserve the right to make changes to improve technical design and may do so without further notice.  
Parameters can vary in different applications. All operating parameters must be validated for each customer  
application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended  
or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,  
costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death  
associated with such unintended or unauthorized use.  
Data sheets can also be retrieved from the Internet:  
http://www.atmel–wm.com  
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany  
Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423  
Rev. A1, 10-Jan-01  
17 (17)  

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