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Электронный компонент: T4258-ILQ

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T4258
Rev. A1, 10-Jan-01
1 (17)
AM/FM Receiver IC
Description
The T4258 is an integrated AM/FM frontend circuit in
BICMOS technology. It contains a double conversion
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
can be built together with the PLL U4256BM. This ICs
are designed for high performance car radio applications.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D Receiving condition analyzer
D Integrated band filter for 2nd IF;
with software controlled bandwidth
D Pin compatible with U4255BM
D FM-double conversion system
D World tuner, US Weatherband, J-band
D Completely integrated FM demodulator
D Soft mute and multipath noise cancellation
D AM up-/down conversion system
D AM stereo capability
D Stop signal generation for AM and FM
D Automatic alignment possible
D 3-wire bus controlled
Block Diagram
AGC
AM
FM
OSC
AGC
Bandgap
Bus
INT
Stop
Soft
Mute
Dev.
Ana.
AM
Dem.
AGC
FM
Dem.
Adj.
Chan.
Divider
Automatic
Adjustment
AM
FM
Multi
path
7
3
6
1
2
4
5
8
9
10
MPX
12
13
14
15
16
17
18
19
21
IF2OUT
22
23
24
25
26
27
28
29
30
31
MULTIP
33
34
IFAGCH
IFAGCL
FILADJ
38
39
OPLPF
41
42
43
44
AMAGC
MX1AMA
GNDMX
MX1FMA
MX1FMB
OSCOUT
GNDOSC
OSCE
OSCB
FMAGC
EN
CLK
DATA
V57
GND
VS
METER
MX2LO ADJAC
INT
SMUTE
DEV
V3P
IF2IN
MX2OA
MX2OB
MX2IN
V3
IF1OUT
IF1AMI
IF1REF
IF1FMI
MX1OB
MX1OA
AMPLPF
V3
V3
MX1AMB
AMVREG
Divider
2...10
Offset
Noise
blanker
32
36
35
20
37
40
11
Figure 1. Block diagram
Ordering Information
Extended Type Number
Package
Remarks
T4258-ILQ
SSO44
Taped and reeled
T4258-ILS
SSO44
Tube
T4258
Rev. A1, 10-Jan-01
2 (17)
Pin Description
Pin
Symbol
Function
1
MX1FMA
1st mixer FM input A
2
MX1FMB
1st mixer FM input B
3
MX1AMB
1st mixer AM input B
4
GNDMX
Ground 1st mixer
5
FMAGC
FM preamplifier AGC
6
AMVREG
AM control voltage
7
AMAGC
AM preamplifier AGC
8
AMPLPF
AM AGC LP filter
9
METER
Fieldstrength output
10
ADJAC
Adjacent channel detection output
11
MPX
Multiplex signal
12
V57
5.7 V reference voltage
13
OSCB
Oscillator basis
14
OSCE
Oscillator emitter
15
GNDOSC
Oscillator ground
16
OSCOUT
Oscillator output
17
EN
3-wire bus enable
18
CLK
3-wire bus clock
19
DATA
3-wire bus data
20
IF2OUT
2nd IF amplifier output
21
INT
Interrupt, stop signal, test out
22
MX2LO
10.25 MHz input for 2nd mixer
23
MX2OB
2nd mixer output B
24
MX2OA
2nd mixer output A
25
GND
Ground
26
MX2IN
2nd mixer input
27
V3P
3 V ref. for AMPIN, AMIFAGC, Control, IF2IN
28
IF2IN
2nd IF amplifier input
29
V3
3 V reference for IF1OUT, MX2IN
30
IF1OUT
1st IF amplifier output
31
DEV
Deviation detect output
32
OPLPF
Operating point LPF
33
IF1AMI
1st IF AM amplifier input
34
SMUTE
Soft MUTE control input
35
IFAGCH
IF AGC LP filter high time constant constant
36
IFAGCL
IF AGC LP filter low time constant
37
FILADJ
Filter adjust
38
IF1FMI
1st IF FM amplifier input
39
IF1REF
1st IF & MX1OUT ref., MX1AMA, MX1AMB
40
MULTIP
Multipath detection output
41
MX1AMA
1st mixer AM input A
42
VS
Supply voltage
43
MX1OA
1st mixer output A
44
MX1OB
1st mixer output B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
AMVREG
AMAGC
AMPLPF
METER
ADJAC
MPX
GNDMX
FMAGC
V57
MX1AMB
MX1FMB
MX1FMA
IF1REF
IF1FMI
FILADJ
IFAGCL
IFAGCH
SMUTE
MX1AMA
MULTIP
IF1AMI
VS
MX1OA
MX1OB
OSCB
OSCE
GNDOSC
OSCOUT
EN
CLK
DATA
IF2OUT
INT
MX2LO
OPLPF
DEV
IF1OUT
V3
IF2IN
V3P
MX2IN
GND
MX2OA
MX2OB
Figure 2. Pinning SSO44
T4258
Rev. A1, 10-Jan-01
3 (17)
Absolute Maximum Ratings
All voltages are referred to GND (Pin 25)
Parameter
Symbol
Value
Unit
Supply voltage
Pin 42
V
S
10
V
Power dissipation
P
tot
1,0
W
Junction temperature
T
j
150
C
Ambient temperature range
T
amb
40 to +85
C
Storage temperature range
T
stg
50 to +150
C
Operating Range
All voltages are referred to GND (Pin 25)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage range
Pin 42
V
S
8
8.5
10
V
Ambient temperature
T
amb
40
85
C
Thermal Resistance
Parameter
Symbol
Value
Unit
Junction ambient
soldered to PCB
R
thJA
t.b.d.
K/W
Electrical Characteristics
Test conditions (unless otherwise specified): V
S
= +8.5 V, T
amb
= +25
C
for AC parameters: fi
RF
= 1 MHz, Rg = 50
W, f
MOD
= 0.4 kHz, m = 0.3, f
IF
= 450 kHz, reference point Pin 4
Parameter
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
Pin 42
V
S
8.5
10
V
Supply current
Pin 42
I
S
100
mA
AM RF AGC
AGC threshold Mixer Input
(2 bit)
91
94
97
100
db
V
db
V
db
V
db
V
AM LO divider
Programmable divider
(3 bit)
N
2
10
AM Mixer (10.7 MHz)
DC supply current
Pin 43 + 44
17
mA
Conversion conductance
io
if
/vi
rf
S
m1
4.1
mA/V
Maximum IF output
Pins 43, 44
Vo
IF
8
V
pp
Input intercept point 3rd
order
IP3
133
dB
V
Input resistance
10 MHz
Pin 41
13
k
W
T4258
Rev. A1, 10-Jan-01
4 (17)
Electrical Characteristics (continued)
Test conditions (unless otherwise specified): V
S
= +8.5 V, T
amb
= +25
C
for AC parameters: fi
RF
= 1 MHz, Rg = 50
W, f
MOD
= 0.4 kHz, m = 0.3, f
IF
= 450 kHz, reference point Pin 4
Unit
Max.
Typ.
Min.
Symbol
Test Conditions / Pins
Parameter
AM-1st IF Amplifier (10.7 MHz)
Input resistance
Pin 33
Ri
100
k
W
IF preamplifier gain
R
L
= 330
W Pins 33 to 30
G
15
dB
Preamplifier control range
26
dB
Output intercept point 3rd
order
IP3
137
dB
V
Noise figure
F
10
dB
Mixer 2 (450 kHz)
DC supply current
Pin 23 + 24
10
mA
Conversion conductance
io
if2
/vi
if1
S
m2
2
mA/V
Maximum IF output
Pins 23, 24
Vo
IF
8
V
pp
Output impedance
Pin 23 GND
Pin 24 GND
R
o
C
o
1
3
M
W
pF
Input intercept point 3rd
order
IP3
133
dB
V
Input resistance
R
i
330
W
2nd IF Amplifier (450 kHz)
Input resistance
Pin 28
R
i
3
k
W
IF preamplifier gain
Pin 28 to 20
G
53
dB
Preamplifier control range
47
dB
IF2 Output (Pin 20)
Output level
200
mV
Oscillator
Oscillator amplitude
R
g
(Pin 13) = 220
W,
Q of L
osc
= 70
V
LOB
V
LOE
V
LObuf
70
160
100
90
220
mV
mV
mV
Frequency range
f
OSC
70
260
MHz
Harmonics
Pin 16
15
dBc
Output resistance
Pin 16
R
LObuf
70
W
Programmable oscillator
divider
Range
FM Europe
FM Japan
AM
WB
Nosc
1
2
3
2
1.5
3
T4258
Rev. A1, 10-Jan-01
5 (17)
Electrical Characteristics
Test conditions (unless otherwise specified): V
S
= +8.5 V, T
amb
= +25
C, for AC parameters: fi
RF
= 100 MHz,
Rg = 50
W, f
MOD
= 0.4 kHz,
Df =
75 kHz, f
IF
= 450 kHz, reference point Pin 4
Parameter
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
FM AGC
AGC threshold mixer input
(2 bit)
Vmixin
85
90
95
103
dB
V
dB
V
dB
V
dB
V
AGC threshold mixer output
Vmix-
out
t.b.d.
dB
V
AGC threshold IF amp. out
Vif1out
t.b.d.
dB
V
FM Mixer
Conversion transconductance
g
c
7
mA/V
3rd order intercept point
Load impedance:
R
L43, 44
= 200
IP3
125
dB
V
Noise figure
NF
dsb
10
dB
Input resistance
Pin 1 to 2
R
i 1, 2
k
Input capacitance
Pin 1 to 2
C
i 1, 2
5
pF
Input 1 resistance to ground
f = 100 MHz
Pin 1
R
i1
k
Input 1 capacitance to
ground
f = 100 MHz
Pin 1
C
i1
9
pF
Input 2 resistance to ground
f = 100 MHz
Pin 2
R
i2
k
Input 2 capacitance to
ground
f = 100 MHz
Pin 2
C
i2
7
pF
Output capacitance to GND
Pins 43, 44
C
o 43,
C
o 44
5
pF
1st IF FM Amplifier
Digitally adjustable gain
3 bit, 10.7 MHz
G
min
G
max
20
30
dB
dB
Input resistance
Pin 38
R
i 38
330
Output resistance
Pin 30
R
o 30
330
Temperature coefficient of
the gain
Bit 66 = 0
TK1
dB/K
Temperature coefficient of
the gain
Bit 66 = 1
TK2
dB/K
Noise figure
F
t.b.d.
dB
Output intercept point 3rd
order
IP3
130
dB
V