TDA8745, Elektronika, elementy
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INTEGRATED CIRCUITS
DATA SHEET
TDA8745
Satellite sound receiver with
I
2
C-bus control
1996 Mar 11
Preliminary specification
Supersedes data of 1995 Mar 08
File under Integrated Circuits, IC02
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
FEATURES
·
On-chip frequency synthesizer and mixer:
–
tuning range 4 to 9.77 MHz
–
reference oscillator 4 MHz (using a crystal or 4 MHz
frequency source)
·
IF input switches allowing selection of various IF
bandwidths (wide or narrow)
APPLICATIONS
·
Demodulation of two audio signals by wide band
Phase-Locked Loops (PLLs)
·
Satellite receivers
·
TV sets
·
Audio level control after PLL (modulation depth setting)
·
Video recorders.
·
Noise Reduction (NR) bypass for use with main audio
signals
GENERAL DESCRIPTION
·
Left, right and mono output [
1
¤
2
(l + r)] on SCART level
The TDA8745 is the successor of the TDA8740 and
TDA8741. The device contains the functionality of the
TDA8740 and TDA8741 together with a synthesizer, mixer
and I
2
C-bus control.
The pin numbers mentioned in this publication refer to the
SDIP42 package; unless otherwise indicated.
·
External audio inputs (for decoder connection)
·
Selectable de-emphasis (DEEM) 50
m
s, 75
m
s, J17 and
flat response
I
2
C-bus control of all functions
·
Two selectable addresses
·
·
Carrier presence detector with automatic mute option.
ORDERING INFORMATION
PACKAGE
TYPE
NUMBER
NAME
DESCRIPTION
VERSION
TDA8745
SDIP42
SOT270-1
plastic shrink dual in-line package; 42 leads (600 mil)
TDA8745H
QFP44
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
SOT307-2
´
10
´
1.75 mm
1996 Mar 11
2
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P1
synthesizer and mixer supply voltage
4.5
5.0
5.5
V
I
2
C-bus supply voltage
V
P2
4.5
5.0
5.5
V
V
P3
general supply voltage
8.0
12.0
13.2
V
I
P1
synthesizer and mixer supply current
-
37
48
mA
I
P2
I
2
C-bus supply current
-
0.6
-
mA
I
P3
general supply current
-
35
46
mA
S/N(A)
signal-to-noise ratio secondary channel
A-weighted;
NR = on; DEEM = 75
m
s
68
77
-
dB
V
i(rms)
input sensitivity (RMS value) baseband input
to mixer
S/N(A) = 40 dB;
NR = on; DEEM = 75
-
0.5
1.5
mV
m
s
V
i(rms)
baseband input voltage (RMS value)
THD
£
0.5%
200
mV
V
o
output voltage
-
8
-
6
-
4
dBV
P
tot
total power dissipation
-
610
800
mW
T
stg
storage temperature
-
65
-
+150
°
C
T
amb
operating ambient temperature
-
20
-
+70
°
C
1996 Mar 11
3
12 V
5 V
100
m
H
4.7
W
5 V
PRES DET L
22
nF
100
m
F
22
nF
22
nF
1000
m
F
1
m
10
m
2.2
m
470
k
10
m
F
1
m
4.7
nF
10
nF
220 nF
F
F
F
F
W
V
P1
ADD
sel
2
V
P2
V
ref
V
P3
C
DC L
RECT
L
C
ATT/REC L
C
NR D L
C
D L
C
CL L
EXT
L
SYNGND
SCL
HFGND
AFGND
SDA
I CGND
6
4
12
18
17
14
16
19
10
32
20
41
42
37
38
36
35
34
33
25
V
ref
2
I C
INTERFACE
PDL
PDR
PRESENCE
DETECTOR
PDL
OML
DC
23
XTAL
40
CRYSTAL
OSCILLATOR
DE-EMPHASIS
50
O
L
HF
LIMITER
AUDIO
LPF
NOISE
REDUCTION
PLL
flat
m
s
10
pF
4 MHz
J17
75
m
s
TUN9 to TUN0
12 to 3dB
200
4 MHz
OML
21
CHARGE
PUMP
j
IL2 to IL0
O
M
N
BB
LEV3 to LEV0
TDA8745
NR
DEM1 and DEM0
OS1 and OS0
OMR
frequency
synthesizer
30 to 40 MHz
SLF
2
VCO
12 to 3dB
DE-EMPHASIS
50
6.8
k
33
nF
HF
LIMITER
AUDIO
LPF
NOISE
REDUCTION
PLL
flat
m
s
22
W
O
R
J17
75
m
s
2
BPFN
1
m
F
DC
PE
PRESENCE
DETECTOR
OMR
IR2 to IR0
PDR
27 pF
27 pF
PRE-BPF
3
BASEBAND
IN
IL2
MIXER
47
m
H
1 k
W
IR2
(1)
15 pF
27 pF
5
9
11
13
15
7
8
39
1
27
26
28
29
30
31
24
IF OUT
C
DC R
RECT
R
C
ATT/REC R
C
NR D R
C
D R
C
CL L
EXT
MBE037
R
10 nF
1
m
10
m
10
m
F
1
m
4.7
nF
10
nF
220 nF
10.7
NARROW
(2)
470
k
F
F
F
W
330
W
330
W
PRES DET R
(2)
10.52
NARROW
330
W
330
W
10.7
WIDE
(2)
330
W
330
W
When driving more than three filters in parallel, pin 5 should be buffered.
(1)
Add 15 pF for NTSC.
(2)
Ceramic filters:
SFE10.7MJA10-A (narrow)
SFE10.52MJA10-A (narrow)
SFE10.7MS2-A (wide).
Fig.1 Block diagram (SDIP42).
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
PINNING
PIN
SYMBOL
DESCRIPTION
SDIP42
QFP44
C
DC R
1
39
DC decoupling capacitor (right channel)
SLF
2
41
synthesizer loop-filter
BASEBAND IN
3
42
baseband input to mixer
V
P1
4
43
synthesizer and mixer supply voltage (+5 V)
IF OUT
5
44
intercarrier output from mixer
SYNGND
6
1
synthesizer and mixer ground
IN-5
7
2
intercarrier input 5/port expansion output 1
IN-6
8
3
intercarrier input 6/port expansion output 2
IN-1
9
4
Intercarrier input 1
HFGND
10
5
HF ground
IN-2
11
6
intercarrier input 2
ADD
sel
12
7
I
2
C-bus address selection
IN-3
13
8
Intercarrier input 3
I
2
CGND
I
2
C-bus ground
14
9
IN-4
15
10
intercarrier input 4
V
P2
16
11
I
2
C-bus supply voltage (+5 V)
SCL
17
12
I
2
C-bus serial clock input
I
2
C-bus serial data input/output
SDA
18
13
V
ref
19
14
decoupling capacitor for reference voltage
V
P3
20
15
general supply voltage (+12 V)
O
M
21
17
mono channel output [
1
¤
2
(l + r)]
O
R
22
18
right channel output
O
L
23
19
left channel output
EXT
R
24
20
external audio input (right channel)
EXT
L
25
21
external audio input (left channel)
C
ATT/REC R
26
22
attack/recovery capacitor (right channel)
RECT
R
27
23
rectifier DC decoupling (right channel)
C
NR D R
28
24
noise reduction de-emphasis capacitor (right channel)
C
DR
29
25
de-emphasis capacitor (right channel)
DEEM OUT R
30
26
de-emphasis output (right channel)
C
CL R
31
27
audio pass-through input (right channel)
AFGND
32
28
AF ground
C
CL L
33
29
audio pass-through input (left channel)
DEEM OUT L
34
30
de-emphasis output (left channel)
C
DL
35
31
de-emphasis capacitor (left channel)
C
NR D L
36
32
noise reduction de-emphasis capacitor (left channel)
RECT
L
37
33
rectifier DC decoupling (left channel)
C
ATT/REC L
38
34
attack/recovery capacitor (left channel)
1996 Mar 11
5
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