Datasheet TDA8745-N2, TDA8745H-N2 Datasheet (Philips)

DATA SH EET

Preliminary specification
Supersedes data of 1995 Mar 08
File under Integrated Circuits, IC02

1996 Mar 11

INTEGRATED CIRCUITS

TDA8745

Satellite sound receiver with
I

2

C-bus control

1996 Mar 11 2

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-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)

• Demodulation of two audio signals by wide band
Phase-Locked Loops (PLLs)

• Audio level control after PLL (modulation depth setting)

• Noise Reduction (NR) bypass for use with main audio

signals

• Left, right and mono output [1⁄2(l + r)] on SCART level

• External audio inputs (for decoder connection)

• Selectable de-emphasis (DEEM) 50 µs, 75 µs, J17 and

flat response

• I2C-bus control of all functions

• Two selectable addresses

• Carrier presence detector with automatic mute option.

APPLICATIONS

• Satellite receivers

• TV sets

• Video recorders.

GENERAL DESCRIPTION

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.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8745 SDIP42

plastic shrink dual in-line package; 42 leads (600 mil)

SOT270-1

TDA8745H QFP44

plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10 × 10 × 1.75 mm

SOT307-2

1996 Mar 11 3

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-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

V

P2

I2C-bus supply voltage 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

I2C-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 µs

68 77 − dB

V

i(rms)

input sensitivity (RMS value) baseband input
to mixer

S/N(A) = 40 dB;
NR = on; DEEM = 75 µs

− 0.5 1.5 mV

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 4

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

BLOCK DIAGRAM

handbook, full pagewidth

ϕ

MBE037

330 Ω

330 Ω

330

Ω

330 Ω

330 Ω

1 kΩ

470

kΩ

1

µF

HF

LIMITER

PLL

HF

LIMITER

PLL

IL2 to IL0

IR2 to IR0

PRESENCE

DETECTOR

AUDIO

LPF

NOISE

REDUCTION

OMR

12 to 3dB

LEV3 to LEV0

OML

PRESENCE

DETECTOR

BB

DC

DC

PDR

IL2

IR2

PRES DET R

C

DC R

RECT

R

C

NR D R

C

D R

DEEM OUT LDEEM OUT R

C

ATT/REC R

PDL

9

PE

11 13 15 7 8

10.7
NARROW

5

330

Ω

10 nF

10

µF

DE-EMPHASIS

50 µs

J17

10

µF

1

µF

4.7

nF

10

nF

75 µs

220 nF

AUDIO

LPF

NOISE

REDUCTION

DE-EMPHASIS

50

flat

flat µs

J17

75 µs

DEM1 and DEM0 OS1 and OS0NR

OML

OMR

O

L

O

M

O

R

23

21

22

29

30 31

24

27

26 2839 1

35 34 33 2537 38 36

EXT

L

C

D L

C

CL L

C

CL L

C

NR D L

C

DC L

V

ref

V

P3

V

P2

V

P1 AFGNDHFGND

PRES DET L

C

ATT/REC L

RECT

L

EXT

470

kΩ

1

µF

12 to 3dB

10

µF

4241

10

µF

1

µF

4.7

nF

10

nF

220 nF

203210

2.2

µF

19

V

ref

1614171812

2

PDL

PDR

I C

INTERFACE

2

VCO

frequency

synthesizer

30 to 40 MHz

N

2

CHARGE

PUMP

200

CRYSTAL

OSCILLATOR

PRE-BPF

4 MHz

MIXER

BPFN

TUN9 to TUN0

SDA

5 V

SCL

ADD

sel

I CGND

46

SYNGND

XTAL

2

40

BASEBAND

IN

IF OUT

6.8

kΩ

33

nF

3

27 pF

27 pF

27 pF

15 pF

1 µF

1000 µF

10

pF

4 MHz

10.52
NARROW

10.7

WIDE

SLF

IN-1

IN-2

IN-3

IN-4

IN-5

IN-6

R

TDA8745

(2)

(1)

(2)

(2)

47 µH

100 µH

4.7 Ω

22

nF

12 V

100 µF

22

nF

5 V

22

nF

Fig.1 Block diagram (SDIP42).

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).

1996 Mar 11 5

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

PINNING

SYMBOL

PIN

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 I2C-bus address selection
IN-3 13 8 Intercarrier input 3
I

2

CGND 14 9 I2C-bus ground
IN-4 15 10 intercarrier input 4
V

P2

16 11 I2C-bus supply voltage (+5 V)

SCL 17 12 I

2

C-bus serial clock input

SDA 18 13 I

2

C-bus serial data input/output

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/RECR

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/RECL

38 34 attack/recovery capacitor (left channel)

1996 Mar 11 6

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

PRES DET R 39 35 presence detector timing (right channel)
XTAL 40 36 crystal input for 4 MHz oscillator
PRES DET L 41 37 presence detector timing (left channel)
C

DC L

42 38 DC decoupling capacitor (left channel)
n.c. − 16 not connected
n.c. − 40 not connected

SYMBOL

PIN

DESCRIPTION

SDIP42 QFP44

handbook, halfpage

1
2
3
4
5
6
7
8

9
10
11
12
13

40
39
38
37
36
35

34
33

32
31
30
29
28
27

14
15

16
17
18
19
20

22

23

24

25

26

21

42
41

O

O

EXT

EXT

ATT/REC R

DEEM OUT R

AFGND

RECT

PRES DET R

XTAL

DC L

DC R

ATT/REC L

PRES DET LSLF

BASEBAND IN

IF OUT

SYNGND

IN-5
IN-6
IN-1

HFGND

IN-2

ADD

IN-3

I CGND

IN-4

SCL

SDA

V

P3

V

P2

V

P1

V

M

O

DEEM OUT L

RECT

TDA8745

2

ref

MBE035

C

C

L

C

NR D L

C

D L

C

CL L

C

CL R

C

D R

C

C

NR D R

R

L
R

L
R

sel

C

Fig.2 Pin configuration (SDIP42).

1996 Mar 11 7

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Fig.3 Pin configuration (QFP44).

handbook, full pagewidth

1
2
3
4
5
6
7
8
9

10
11

33
32
31
30
29
28
27
26
25
24
23

12

13

14

15

16

17

18

19

20

21

22

44

43

42

41

40

39

38

37

36

35

34

RECT

NR D L

DEEM OUT L

AFGND

DEEM OUT R
C

C
RECT

IF OUTVBASEBAND IN

SLF

n.c.

DC L

C

DC R

P1

C

XTAL

PRES DET R

PRES DET L

ATT/REC L

C

TDA8745H

SYNGND

IN-5
IN-6
IN-1

HFGND

IN-2

ADD

IN-3

IN-4

V

2

I CGND

SCL

SDA

V

O

M

O

R

O

R

C

L

n.c.

EXTLEXT

ATT/REC R

ref

V

P3

MBE034

L

C

CL L

C

CL R

D R

R

NR D R

C

D L

C

sel

P2

1996 Mar 11 8

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

FUNCTIONAL DESCRIPTION
Satellite sound

The baseband signal coming from a satellite tuner
comprises the demodulated video signal plus a number of
sound carriers in the event of reception of a PAL, NTSC or
SECAM satellite signal.

Nearest to the video signal is the main sound carrier which
carries the mono sound related to the video. This is an FM
modulated carrier with a fixed pre-emphasis. The carrier
frequency can be in the range of 5.8 to 6.8 MHz.

Additionally, a number of optional secondary sound
carriers may be present. These can be used for stereo or
multi-language sound related to the video signal, or for
unrelated radio sound. These carriers are also FM
modulated, and for better sound quality (improved
signal-to-noise performance) broadcast satellites
(e.g. ‘ASTRA’) use a noise reduction system (adaptive
pre-emphasis circuit, combined with a fixed
pre-emphasis). These secondary carrier frequencies can
be in the range of 6.30 to 8.28 MHz.

For accurate tuning to the many sound carriers, an internal
frequency synthesizer and mixer are used to transfer the
sound carriers to intermediate frequencies of

10.7 and 10.52 MHz.
The TDA8745 contains all circuitry for the processing of

the main channel and secondary channels, from baseband
signal to line (SCART) output drivers. By means of
external band-pass filters the desired frequencies coming
from the synthesizer/mixer are routed to the IF
limiter/demodulator inputs.

Band-pass filter and mixer

Before the incoming baseband signal is applied to the
mixer, the signal is filtered. Related to the sound carriers,
the level of the video part of the baseband signal can be
much higher, so to avoid overload it is desirable to
attenuate the latter, this is also to avoid interference
(additional unwanted mix of signals after mixing).

The internal band-pass filter (pass band from
approximately 4 to 10 MHz) is completed by a simple
external notch filter. The external filter provides substantial
attenuation of the video colour carrier. The notch filter is
chosen to be external because the required notch
frequency is TV standard dependent and also because an
accurate on-chip notch filter requires a tuning mechanism
(consuming additional chip area).

The mixer is a double-balanced mixer with degeneration,
this to accommodate the level of the filter output signal.

The mixer transfers the different sound carrier frequencies
to fixed intermediate frequencies of 10.7 and 10.52 MHz.
These frequencies are fed via an internal buffer stage to
external ceramic band-pass filters before they are routed
to the two demodulator inputs. The buffer stage can drive
up to three external ceramic band-pass filters (assuming
330 Ω filter terminations) but this can be increased to four
or more by adding an external buffer.

Synthesizer

The synthesizer consists of the following parts:

• Reference oscillator

• Reference divider

• A 10-bit programmable divider

• Phase detector

• Charge pump

• Voltage Controlled Oscillator (VCO)

• Divide-by-two circuit.

The reference frequency circuit consists of a 4 MHz crystal
oscillator and a divider (by 200). The resulting reference
frequency of 20 kHz is fed to the phase detector.
The programmable divider consists of a series of cells
(divide by 2 or 3) connected as a ripple counter.
The minimum division ratio is 2

n

and the maximum division

ratio is 2

n+1

−1.

The programmable divider output signal is also fed to the
phase detector. The charge pump provides output current
pulses in accordance with the signals from the phase
detector. The final tuning voltage for the VCO is provided
by the loop filter and a buffer amplifier.

The oscillator frequency range is from

29.04 to 40.94 MHz, depending on the setting of the
programmable divider (by the TUN signal). The tuning
voltage is clipped to limit the VCO frequency range.
The frequency of the oscillator is divided-by-two before it
is applied to the mixer (to obtain the desired 10 kHz
resolution).

Left and right channel inputs

A maximum of six inputs are available (pins 9, 11, 13, 15,
7 and 8). External ceramic band-pass filters, which are
tuned to the desired intermediate frequencies, route the
signals to the inputs.

For stereo purposes the TDA8745 contains two identical
secondary sound processing channels (secondary
channel 1 will also be referred to as ‘left’ or ‘language 1’
and secondary channel 2 as ‘right’ or ‘language 2’).

1996 Mar 11 9

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

With the input selection every input pin of the left and/or
right channel can be independently selected. Input
selection for the left channel is controlled by the IL signal
and for the right channel by the IR signal.

From the inputs, the signals are coupled to the
limiter/amplifier and to the PLL demodulator of each
channel. The output signal from the PLL is routed to both
the presence detector and audio level control.

The inputs of pins 7 and 8 can be changed into digital
outputs for external switching purposes, set by the so
called Port Extension bit (PE). Not used inputs should be
connected to ground. Note that the inputs of pins 7 and 8
are also floating when not in Port Extension mode.

Presence detector

The presence detector is used to determine if a carrier is
present on the channel of interest. It does so by measuring
the amount of high frequency noise (>20 kHz) in the audio
signal, which is directly related to the C/N (carrier-to-noise
ratio) at the IF input. If a carrier is present, these high
frequencies are fairly moderate, if no carrier is present,
strong noise components are present.

The audio signal, first high-pass filtered and then rectified,
is filtered by the components at pins 41 and 39
(PRES DET L and PRES DET R). The DC level at this pin
is then compared with an internal reference voltage. If the
level at pins 41 and 39 exceeds this voltage level, the
presence detector output goes HIGH (no carrier).

This output signal can be used to drive the output mute (if
bit PDM = 1; see Section “Output selection”) and can be
monitored by reading bits PDL and PDR. The detection
level can be modified by changing the leakage resistor at
pins 41 and 39, a higher resistor value gives a ‘no carrier’
response ant C/N levels detected as ‘carrier present’ with
a lower resistor value.

Audio level control

Each demodulator output signal is amplified in a buffer
amplifier and DC decoupled by means of electrolytic
capacitors connected to pin 42 (left) and pin 1 (right).

The output level of all channels is −6 dBV typical at a
frequency deviation of the FM signal of 54% of the
maximum deviation (i.e 0.54 × 85 kHz = 46 kHz for the
main channel and 0.54 × 50 kHz = 27 kHz for the
secondary channels) at 1 kHz modulation frequency
(reference level).

To adjust for different (main channel) modulation depths
used at some satellites the audio level is made adjustable,
the signal can be controlled in steps of 1 dB from

−12 dB to +3 dB by the LEV signal.

Noise Reduction (NR)

To improve the quality of the secondary channels, the
audio signal is processed at the transmitter side before
modulation. For an overall flat audio response the inverse
processing must take place after demodulation. This is
achieved in the NR.

The NR can be regarded as an input level dependent
Low-Pass Filter (LPF) [adaptive de-emphasis system]
followed by a fixed de-emphasis. Figure 3 shows the
transfer characteristics as function of the input level
(normalized to input level, and without the fixed
de-emphasis).

At maximum input level (50 kHz frequency deviation,
referred to as 0 dB) the frequency response of the first part
(i.e. without fixed de-emphasis) is nearly flat (note the
small dip around 3 kHz in Fig.3; this is a system attribute).
As the input level is X dB lowered, the higher output
frequencies will be reduced an extra X dB with respect to
the lower frequencies (1 : 2 expansion).

If a main carrier signal is received, the NR can be
bypassed at which the signal is fed directly to the
de-emphasis circuit. The noise reduction is active when
the NR signal (via I

2

C-bus) is logic 1.

De-emphasis

De-emphasis is realized by means of several internal
resistors and an external capacitor to ground. Via the
I

2

C-bus, the DEM signal can be switched between 50 µs,
75 µs, J17 and no de-emphasis. Figure 4 shows these
four different possibilities.

Output selection

With the output selector the output pins 23 and 22 can be
switched to the left and right satellite channels
(pins 33 and 31) or to the external inputs (pins 25 and 24)
for an other signal source or for connection of a decoder
box. the OS1 and OS0 bits determine this selection.

Pin 21 is a separate output which delivers the mono
channel. The mono signal is the sum of pin 23 (left) and
pin 22 (right) output signal [

1

⁄2(l + r)].

1996 Mar 11 10

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Output pins 23 and 22 can be muted by setting the
OML and OMR signals to logic 1. In addition, automatic
muting is also possible, the presence detector (as
described in Section “Presence detector”) sets the PDL bit
(PDR for other channel). Absence of a carrier at the
selected frequency results in automatic muting. This
mechanism is enabled or inhibited by the PDM bit
(Presence Detector auto Mute).

All outputs (pins 21, 22 and 23) are line drivers with
SCART level capability and are short-circuit protected by
means of 125 Ω output resistors. Pins 34 and 30 are also
line drivers at SCART level and can be used as signal
outputs before the IC’s output selection (i.e. for decoder
box use).

ABBREVIATIONS

BPF = Band-Pass Filter.
f

mod

= modulating frequency.

∆fM= frequency deviation of the main Channel.
∆fS1= frequency deviation of secondary Channel 1 (left).
∆fS2= frequency deviation of secondary Channel 2 (right).

f

OM

= carrier frequency of main Channel.

f

OS1

= carrier frequency of secondary Channel 1.

f

OS2

= carrier frequency of secondary Channel 2.
IF = Intermediate Frequency.
IL = Input Left.
IR = Input Right.
LPF = Low-Pass Filter.
NR = Noise Reduction.
OML = Output Mute Left.
OMR = Output Mute Right.
OS = Output Select.
PDM = Presence Detector auto Mute.
PE = Port Extension.
PLL = Phase-Locked Loop.
POR = Power-On Reset.
S/N = Signal-to-Noise ratio.
VCO = Voltage Controlled Oscillator.

handbook, halfpage

10

5

MBE284

10

4

10

3

10

2

10

4

0

8

12

16

20

24

transfer

(dB)

f (Hz)

20 dB

0 dB

Fig.4 Noise reduction transfer as function of

input level.

handbook, halfpage

10

5

MBE285

10

4

10

3

10

2

10

4

0

4

8

8

12

16

transfer

(dB)

f (Hz)

50 µs

75 µs

flat

J17

Fig.5 LF de-emphasis curves.

1996 Mar 11 11

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

I2C-BUS PROTOCOL
Table 1 Slave receiver/transmitter address: D4 or D6 (HEX)

Notes

1. AS bit defined by level at address select (pin 12); 0 V = logic 0; 5 V = logic 1.

2. R/W = 0; TDA8745 is receiver (microcontroller is master transmitter).
R/W = 1; TDA8745 is transmitter (microcontroller is master receiver).

TDA8745 receiver use

In the receiver mode the device has four subaddresses with auto-increment, as shown in Tables 2 to 5.

Table 2 Input byte SA: 00; situation after POR

Table 3 Tuning byte SA: 01; situation after POR

Table 4 Select byte SA: 02; situation after POR

Table 5 Audio byte SA: 03; situation after POR

TDA8745 transmitter use

No subaddress.

Table 6 Read byte

BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

110101AS

(1)

R/W

(2)

IL2

i7

IL1

i6

IL0

i5

IR2

i4

IR1

i3

IR0

i2

TUN9

i1

TUN8

i0

00000110

TUN7

t7

TUN6

t6

TUN5

t5

TUN4

t4

TUN3

t3

TUN2

t2

TUN1

t1

TUN0

t0

11101100

TEST

s7

BB

s6

OS1

s5

OS0

s4

PDM

s3

PE

s2

OML

s1

OMR

s0

00000011

LEV3

a7

LEV2

a6

LEV1

a5

LEV0

a4

NR

a3

DEM1

a2

DEM0

a1

BPFN

a0

11001110

PDL

r7

PDR

r6

−

r5

−

r4

−

r3

−

r2

−

r1

POR

r0

0 or 10 or 1111110 or 1

1996 Mar 11 12

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Slave receiver mode (bits transmitted from microcontroller to TDA8745)

Different IF inputs can be selected for the PLLs, for switching between different external BPFs and/or channels;
see Tables 7 and 8.

Table 7 IL2 to IL0; Input Left; note 1

Notes

1. X = don’t care.

2. Bit PE (s2) can be set to logic 1 to change IF input 5 into digital output for external switching purposes.

IL2

i7

IL1

i6

IL0

i5

PE

(2)

s2

MODE

0000IF input IN-1 selected for left PLL (after POR)
0010IF input IN-2 selected for left PLL
0100IF input IN-3 selected for left PLL
0110IF input IN-4 selected for left PLL
1000IF input IN-5 selected for left PLL
1010IF input IN-6 selected for left PLL
1100no selection
1110no selection
X 0 0 1 IF input IN-1 selected for left PLL
X 0 1 1 IF input IN-2 selected for left PLL
X 1 0 1 IF input IN-3 selected for left PLL
X 1 1 1 IF input IN-4 selected for left PLL
0 X X 1 IF input IN-5 used as output; 0 = 0 V
1 X X 1 IF input IN-5 used as output; 1 = 5 V

1996 Mar 11 13

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 8 IR2 to IR0; input right; note 1

Notes

1. X = don’t care.

2. Bit PE (s2) can be set to logic 1 to change IF input 6 into digital output for external switching purposes.

IR2

i4

IR1

i3

IR0

i2

PE

(2)

s2

MODE

0000IF input IN-1 selected for right PLL
0010IF input IN-2 selected for right PLL (after POR)
0100IF input IN-3 selected for right PLL.
0110IF input IN-4 selected for right PLL
1000IF input IN-5 selected for right PLL
1010IF input IN-6 selected for right PLL
1100no selection
1110no selection
X 0 0 1 IF input IN-1 selected for right PLL
X 0 1 1 IF input IN-2 selected for right PLL
X 1 0 1 IF input IN-3 selected for right PLL
X 1 1 1 IF input IN-4 selected for right PLL
0 X X 1 IF input IN-6 used as output; 0 = 0 V
1 X X 1 IF input IN-6 used as output; 1 = 5 V

1996 Mar 11 14

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 9 TUN9 to TUN0; tuning

Note

1. This is the situation after POR.

The frequency range of synthesizer is shown in Table 10.

Table 10 Frequency range of synthesizer

Notes

1. Tuning the synthesizer below 29.04 MHz may be possible, but is not guaranteed.

2. The mixing frequency (f

mix

) can be calculated with equation:

f

mix

= (1024 + 512[TUN9] + 256[TUN8] + 128[TUN7] + 64[TUN6] + 32[TUN5] + 16[TUN4] + 8[TUN3] + 4[TUN2] +

2[TUN1] + [TUN0]) × 10 kHz.

3. Tuning frequency = mixer input frequency − 10.7 MHz.

TUN9i1TUN8i0TUN7t7TUN6t6TUN5t5TUN4t4TUN3t3TUN2t2TUN1t1TUN0

t0

10.7 IF
(MHz)

10.52 IF
(MHz)

0110101100 3.82 4.00
0110101101 3.83 4.01
0110101110 3.84 4.02

0110101111 to 1001010011 3.85 to 5.49 4.03 to 5.67

1001010100 5.50 5.68

1001010101 to 1010000101 5.51 to 5.99 5.69 to 6.17

1010000110 6.00 6.18

1010000111 to 1010110111 6.01 to 6.49 6.19 to 6.67

1010111000 6.50 6.68

1010111001 to 1011101011 6.51 to 7.01 6.69 to 7.19

10111011007.02

(1)

7.20

(1)

1011101101 to 1100001111 7.03 to 7.37 7.21 to 7.55

1100010000 7.38 7.56

1100010001 to 1100110011 7.39 to 7.73 7.57 to 7.91

1100110100 7.74 7.92

1100110101 to 1111111100 7.75 to 9.74 7.93 to 9.92
1111111101 9.75 9.93
1111111110 9.76 9.94
1111111111 9.77 9.95

PARAMETER

RANGE

(MHz)

Synthesizer frequency range 29.04 to 40.94 (in 20 kHz grid); note 1
Mixer input frequency range 14.52 to 20.47 (in 10 kHz grid); note 2
Tuning range 3.82 to 9.77 (in 10 kHz grid; 10.7 MHz IF); note 3

1996 Mar 11 15

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 11 Bit TEST

Table 12 Bit BB; baseband; note 1

Note

1. The PLL demodulators can also be used for demodulating FM carriers (e.g. terrestrial TV sound) at baseband
frequencies, by changing the lock range of the PLLs.

Table 13 Bits OS1 and OS0; output select; note 1

Note

1. The signal at both line outputs O

L

and OR (pins 23 and 22) can be selected with bits OS1 and OS0.

Table 14 Bit PDM; Presence Detector auto Mute; note 1

Note

1. In both situations the status of the presence detector can be monitored by reading the bits PDL (r7) and PDR (r6)
back from the IC. Appropriate action (e.g. muting, channel selection or tuning) can then be taken by the
microcontroller. Note that this function also mutes the signal from the external inputs (pins 25 and 24). This may be
desirable when using these inputs for connecting a satellite descrambler box. If not, reset PDM (s3) to logic 0 when
selecting external [e.g. together with bits OS1 (s5) and OS0 (s4)].

TEST

s7

MODE DESCRIPTION

0 − (POR) in applications this bit should always be logic 0, to avoid conflicts with other settings
1 test setting TEST enables some special modes used for factory testing

BB

s6

MODE DESCRIPTION

0 synthesizer synthesizer use (PLLs central frequency approximately 10.7 MHz) (after POR)
1 baseband baseband use (PLLs central frequency approximately 6 MHz)

OS1

s5

OS0

s4

MODE DESCRIPTION

0 0 stereo (POR) Left channel audio (pin 33) at O

L

; right channel audio (pin 31) at O

R

0 1 left Left channel audio (pin 33) at both OLand O

R

1 0 right Right channel audio (pin 31) at both OLand O

R

1 1 external External left at (pin 25) at OL; external right (pin 24) at O

R

PDM

s3

MODE DESCRIPTION

0 − (POR) −
1 PDM if this bit is set to logic 1, a channel for which no incoming carrier is found will be muted

1996 Mar 11 16

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 15 Bit PE; Port Extension; note 1

Note

1. Two IF inputs (IN-5 and IN-6; pins 7 and 8) can be used as digital output instead. If no more than four IF inputs are
needed, two external functions can be controlled via the I2C-bus this way. The level at these pins is controlled by
bits IL2 (i7) and IR2 (i4); see Tables 7 and 8.

Table 16 Bits OML and OMR; Output Mute Left and Output Mute Right; note 1

Note

1. Left and right audio can be muted independently. Note that also the external input signals (pins 25 and 24) can be
muted this way.

PE

s2

DESCRIPTION

0 6 IF inputs; no digital output (after POR)
1 4 IF inputs; 2 digital outputs

BIT LEVEL MODE DESCRIPTION

OML (s1) 0 −−

1 mute Left audio channel is muted

OMR (s0) 0 −−

1 mute Right audio channel is muted

1996 Mar 11 17

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 17 Bits LEV3 to LEV0; level adjust; note 1

Notes

1. The audio level can be adjusted in steps of 1 dB, to adjust for different FM deviations used in main channel audio
carriers and/or spread in PLL output amplitude. With secondary carriers the Noise Reduction (NR) is to be used with
the 0 dB setting (note that the NR audio frequency response is level dependent, therefore another setting than 0 dB
is only to be used when making a fine-adjustment (+2 dB/−2 dB) for PLL spread. Typical setting for main channel
carriers is in most cases 85 kHz (0 dB) or 76 kHz (+1 dB).

2. Maximum deviation.

3. Situation after POR.

Table 18 Bit NR; Noise Reduction; note 1

Note

1. For reception of main channel carriers the NR circuit can be bypassed.

LEV3

a7

LEV2

a6

LEV1

a5

LEV0

a4

MODE

SECONDARY

CHANNELS

(2)

(kHz)

MAIN CHANNEL

(2)

(kHz)

0000−12 dB 199 338
0001−11 dB 177 302
0010−10 dB 158 269
0011−9 dB 141 240
0100−8 dB 126 214
0101−7 dB 112 190
0110−6 dB 100 170
0111−5 dB 89 151
1000−4 dB 79 135
1001−3 dB 71 120
1010−2 dB 63 107
1011−1dB 56 95
1100 0dB 50

(3)

85

(3)

1101+1dB 45 76
1110+2dB 40 68
1111+3dB 35 60

NR

a3

MODE DESCRIPTION

0 NR bypassed Noise Reduction bypassed (main channel)
1 NR active Noise Reduction active (secondary channels) (after POR)

1996 Mar 11 18

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Table 19 Bits DEM1 and DEM0; De-emphasis; note 1;

see Fig.5

Notes

1. Different de-emphasis characteristics can be selected,
to adjust for different main channel audio carriers.

2. In most cases the de-emphasis needed for main
channel carriers is 50 µs.

3. The NR is to be used with the 75 µs setting for
standard secondary channels.

Table 20 Bit BPFN; Band-Pass Filter Not; note 1

Note

1. To avoid interference by the video signal, the incoming
baseband signal is filtered. If this filtering is not
required the filter can be switched off.

DEM1

a2

DEM0

a1

DE-EMPHASIS

0 0 no de-emphasis (flat)
0 1 J17
1050µs

(2)

1175µs [por]

(3)

BPFN

a0

DESCRIPTION

0 mixer input signal filtered by BPF

(after POR)

1 mixer input signal is not filtered

Slave transmitter mode (bits transmitted from
TDA8745 to microcontroller)

Table 21 Bit PDL; Presence Detector Left; note 1

Note

1. Bit PDL (r7) transmits the current status of the left
channel presence detector. When PDL = 1, no carrier
is found at the currently selected frequency. If bit
PDM (s3) = 0 the left channel audio is muted.

Table 22 Bit PDR; Presence Detector Right; note 1

Note

1. Bit PDR (r6) transmits the current status of the right
channel presence detector. When PDR = 1, no carrier
is found at the currently selected frequency. If bit
PDM (s3) = 0 the right channel audio is muted.

PDL

r7

DESCRIPTION

0 carrier detected at left channel
1 no carrier detected at left channel

PDR

r6

DESCRIPTION

0 carrier detected at right channel
1 no carrier detected at right channel

Table 23 Bit POR; Power-On Reset; note 1

Note

1. At switching on, or after a power dip on the I2C-bus supply voltage (VP2), an internal signal is generated which resets
the I2C-bus registers to a pre-defined state. If bit POR (r0) = 1, such a situation has occurred since the last time the
read byte was read. After reading, the bit is reset to logic 0.

Table 24 Bits r5 to r1

POR

r0

DESCRIPTION

0 normal operation
1 POR generated; power dip detected since last read of POR bit

−

r5

−

r4

−

r3

−

r2

−

r1

DESCRIPTION

11111These bits have no function. Although their state is fixed, the microcontroller

should not rely on this because of eventual future use.

1996 Mar 11 19

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Notes

1. All voltages referenced to ground at pins 6, 10, 14 and 32.

2. Port Extension enabled (PE = 1; see Table 15).

3. IN-5 and IN-6 (pins 7 and 8) not being in the Port Extension mode.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P1

synthesizer and mixer supply voltage note 1 0 5.5 V

V

P2

I2C-bus supply voltage note 1 0 5.5 V

V

P3

general supply voltage note 1 0 13.2 V

V

n

voltage on pins 2, 3, 5 and 40 note 1 0 5.5 V
voltage on pins 7 and 8 note 2 0 V

P2

V

voltage on pins 1 and 42 note 1 0 7.7 V

V

i

input voltage on pins 7, 8, 9, 11,13 and 15 notes 1 and 3 0 1 V

T

stg

storage temperature −65 +150 °C

T

amb

operating ambient temperature −20 +70 °C

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air

SDIP42 50 K/W
QFP44 60 K/W

1996 Mar 11 20

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

DC CHARACTERISTICS

All voltages referenced to ground (pins 6, 10, 14 and 32). In accordance with the block diagram (see Fig.1);
VP1=VP2=5V; VP3=12V; T

amb

=25°C; f

OS1

= 10.7 MHz; f

OS2

= 10.52 MHz (no modulation; see note 1); unless

otherwise specified.

Notes

1. Presence of both carriers is required to achieve lock of the PLLs; otherwise not all pins will have a stable DC voltage.

2. Pin 7 and 8 functioning as normal inputs (bit PE = 0).

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P1

synthesizer and mixer supply voltage 4.5 5.0 5.5 V

V

P2

I2C-bus supply voltage 4.5 5.0 5.5 V

V

P3

general supply voltage 8.0 12 13.2 V

I

P1

synthesizer and mixer supply current − 37 48 mA

I

P2

I2C-bus supply current − 0.6 − mA

I

P3

general supply current − 35 46 mA

P

tot

total power dissipation − 610 800 mW

Pins

V

21,22,23

voltage on pins 21, 22 and 23 − 3.8 − V

V

24,25,31,33

voltage on pins 24, 25, 31 and 33 − 3.8 − V

V

31,33

voltage on pins 31 and 33 − 3.8 − V

V

30,34

voltage on pins 30 and 34 − 3.8 − V

V

27,37

voltage on pins 27 and 37 − 3.8 − V

V

19

voltage on pin 19 3.7 3.8 3.9 V

V

9,11,13,15

voltage on pins 9, 11, 13 and 15 note 2 − 0 − V

V

42,1

voltage on pins 42 and 1 − 3.4 − V

V

41,39

voltage on pins 41 and 39 − 2.6 − V

V

5

voltage on pin 5 − 1.8 − V

V

3

voltage on pin 3 − 2.4 − V

V

2

voltage on pin 2 − 2.6 − V

V

40

voltage on pin 40 − 1.3 − V

Port extensions (pins 7 and 8; bit PE = 1)

V

OH

HIGH level output voltage IOH= 0.5 mA 4.5 − 5V

V

OL

LOW level output voltage IOL= −0.5 mA 0 − 0.5 V

1996 Mar 11 21

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

AC CHARACTERISTICS

All voltages referenced to ground (pins 6, 10, 14 and 32); in accordance with the block diagram (see Fig.1);
VP1=VP2=5V; VP3=12V; T

amb

=25°C; f

mod

= 1 kHz; ∆fM= 46 kHz; ∆fS1= ∆fS2= 27 kHz (reference levels);

fOM= 10.7 MHz; f

OS1

= 10.7 MHz; f

OS2

= 10.52 MHz; IF level at pins 9, 11,13, 15, 7 and8=20mV (RMS value) and

SFE 10.7MJA (narrow), SFE 10.52MJA (narrow) and SFE 10.7MS3 (wide) ceramic filters; unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Band-pass filter, mixer and buffer

R

i

input resistance 10 12.5 15 kΩ

V

i(rms)

baseband input voltage (RMS value) note 1 −−200 mV

V

3

1 dB compression point (RMS value) ∆V3−∆V5= 1 dB; note 2 − 180 − mV

H

l/Hh

filter transfer at 200 kHz
with respect to 7.3 MHz

−−−60 dB

H

lm/Hh

filter transfer at 2 MHz
with respect to 7.3 MHz

−−28 −20 dB

H

mh/Hh

filter transfer at 5.3 MHz
with respect to 7.3 MHz

−2+2+4dB

H

h

*A filter transfer at 7.3 MHz and

mixer amplification

15 17 19 dB

H

h

*C filter transfer at 7.3 MHz and

mixer conversion gain

note 3 10 12 14 dB

I

o(p)

mixer output current (peak) 5 7 − mA

R

o

mixer output resistance f = 10.7 MHz; note 4 − 12 30 Ω

Charge pump, buffer amplifier and VCO

t repetition time of charge pump pulses − 50 −µs
S

VCO

VCO sensitivity note 5 −−9−MHz/V

f

VCO

VCO frequency V

loopf

= 2.6 V − 35.4 − MHz

Crystal oscillator (4 MHz)

f

xtal

crystal oscillator frequency − 4 − MHz

R

xtal

resonance resistance of crystal −−60 Ω

C

xtal

parallel capacitance of crystal − 4.5 10 pF

I

i(p)

input current from external 4 MHz
source (peak)

note 6 50 −−µA

IF inputs (pins 9, 11, 13, 15, 7 and 8) and limiters

V

IN-1 to IN-6(rms)

input sensitivity (RMS value) S/N(A) = 40 dB;

∆fS= 27 kHz; NR = on;
de-emphasis = 75 µs

− 0.3 1 mV

S/N(A) = 40 dB;
∆f

M

= 46 kHz; NR = off;

de-emphasis = 50 µs

− 0.8 2 mV

V

i1

to V

i6

input signal THD ≤ 0.5% −−200 mV

1996 Mar 11 22

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

PLL FM demodulators

f

CCO

free-running frequency PLL left; BB = 0 − 10.6 − MHz

PLL right; BB = 0 − 10.6 − MHz
PLL left; BB = 1 − 6.9 − MHz
PLL right; BB = 1 − 6.9 − MHz

∆f

CCO

lock range of PLLs BB= 0; note 7 10 − 11.5 MHz

BB = 1; note 7 5.50 − 8.50 MHz

V

OL

; V

OR

PLL output voltage (pins 23 and 22) NR = off; DEEM = flat;

BB = 0

−−5.6 − dBV

NR = off; DEEM = flat;
BB = 1; note 8

−−7.3 − dBV

∆VOL; ∆V

OR

spread of PLL output voltage over
lock range (pins 23 and 22)

NR = off; DEEM = flat;
BB = 1; note 8

−−±1.5 dB

Noise reduction

low-pass filter 50 kHz response
with respect to 1 kHz

note 9 −21 −16 −11 dB

V

o 23,22

output voltage (pins 23 and 22) at 0 dB NR input level;

∆fS1= ∆fS2= 50 kHz;
DEEM = flat; note 10

−1+1+3dBV

at −20 dB NR input level;
∆f

S1

= ∆fS2= 5 kHz;

DEEM = flat

−29 −26 −23 dBV

15 kHz frequency response
with respect to 1 kHz

at 0 dB NR input level;
∆f

S1

= ∆fS2= 50 kHz;

DEEM = flat

−2 0 +2 dB

at −20 dB NR input level;
∆f

S1

= ∆fS2= 5 kHz;

DEEM = flat

−13 −11.5 −10 dB

V

offset(DC)

DC offset voltage on attack/recovery
capacitors (pins 38 and 26)

∆f = 0 kHz; all PLLs locked 14 − 22 mV

De-emphasis

15 kHz frequency response
with respect to 1 kHz flat

NR = off; DEEM = flat −0.5 0.0 +0.5 dB
NR = off; DEEM = J17;

note 11

−13.9 −12.4 −10.9 dB

NR = off; DEEM = 50 µs −15.2 −13.7 −12.2 dB
NR = off; DEEM = 75 µs −18.6 −17.1 −15.6 dB

R

o

output resistance (pins 34 and 30) 100 125 150 Ω

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

37,27 (50 kHz)

V

37,27 (1 kHz)

---------------------------------

V

23,22 (15 kHz)

V

23,22 (1 kHz)

--------------------------------- -

V

23,22 (15 kHz)

V

23,22 (1 kHz)

--------------------------------- -

1996 Mar 11 23

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Overall performance

V

i 3(rms)

baseband input sensitivity main
sound carrier (RMS value)

S/N(A) = 40 dB;
∆fS= 27 kHz; NR = on;
DEEM = 75 µs

− 0.5 1.5 mV

S/N(A) = 40 dB;
∆f

M

= 46 kHz; NR = off;

DEEM = 50 µs

− 1.5 3 mV

V

o 23,22

output voltage secondary channels;

∆fS= 27 kHz; NR = on;
DEEM = 75 µs

−8 −6 −4 dBV

main channel;
∆f

S

= 46 kHz; NR = off;

DEEM = 50 µs

−8 −6 −4 dBV

UBS unbalance output voltage secondary channels;

NR = on; DEEM = 75 µs

−1 − +1 dBV

main channel; NR = off;
DEEM = 50 µs

−1 − +1 dBV

THD total harmonic distortion secondary channels;

NR = on; DEEM = 75 µs;
note 12

− 0.1 0.5 %

main channel; NR = off;
DEEM = 50 µs; note 12

− 0.1 0.5 %

S/N(A) signal-to-noise ratio A-weighted; secondary

channels (synthesizer
included); NR = on;
DEEM = 75 µs; note 12

69 77 − dB

A-weighted; secondary
channels (synthesizer
excluded); NR = on;
DEEM = 75 µs; note 12

72 80 − dB

A-weighted; main channel
(synthesizer included);
NR = off; DEEM = 50 µs;
note 12

54 62 − dB

A-weighted; main channel
(synthesizer excluded);
NR = off; DEEM = 50 µs;
note 12

62 70 − dB

MUTE

att

mute attenuation output select left and right

muted

74 90 − dB

α

ct S/S

crosstalk attenuation between
secondary channels

− 74 − dB

SVRR

P3

supply voltage ripple rejection VRR= 100 mV; fi= 70 Hz;

NR = on; DEEM = 75 µs

− 14.3 − dB

V

RR

= 100 mV; fi= 1 kHz;

NR = on; DEEM = 75 µs

− 15.6 − dB

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1996 Mar 11 24

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

Notes

1. Maximum of 0.5% THD at LF outputs.

2. When the increase of the output signal (pin 5 at 10.7 MHz) lags 1 dB behind the increase of the input signal
(pin 3; 7.02 MHz carrier), the so called 1 dB compression point is reached. For complex signals (more than one
sound carrier), this point will shift to a higher value.

3. The mixer performs both a mixing and amplifying action (normal operation). The synthesizer is tuned to the 7.3 MHz
incoming carrier.

4. The buffer output is sensitive to capacitive loading, therefore (capacitive) loads other than those present in the block
diagram (see Fig.1) should be avoided.

5. As present at the mixer output (pin 5) in ‘BPFTILT’ test mode the actual VCO sensitivity is two times the given value
because of the divide-by-two circuit between VCO output and mixer.

6. The required 4 MHz crystal can be omitted if this frequency is already available in the application. This signal source
should be connected to pin 40, via a capacitor in series with a resistor R

ext

. The minimum required AC current is

50 µA, determined by the resistors R

int

and R

ext

and the level of the 4 MHz AC voltage. The value of R

int

is 700 Ω

and the signal shape of the signal is not important.

SVRR

P1-P2

supply voltage ripple rejection VRR= 100 mV; fi= 70 Hz;

NR = on; DEEM = 75 µs

− 25 − dB

V

RR

= 100 mV; fi= 1 kHz;

NR = on; DEEM = 75 µs

− 4 − dB

Output select

V

i 25,24

input voltage (pins 25 and 24) −−8 dBV

R

i 25,24,33,31

input resistance at
pins 25, 24, 33 and 31

100 150 200 kΩ

V

o 23,22

output voltage at pins 23 and 22 V

24,25

= −6 dBV;

OS = external

−6.5 −6 −5.5 dBV

R

o 23,22,21

output resistance at
pins 23, 22 and 21

100 125 150 Ω

THD total harmonic distortion V

24,25

= −6 dBV;

OS = external; f=1kHz

− 0.01 0.3 %

S/N(A) signal-to-noise ratio A-weighted;

V

24,25

= −6 dBV;

OS = external

80 −−dB

α

ct L/R

; α

ct R/L

crosstalk between channels f = 1 kHz − 80 − dB

I

2

C-bus

C

i

input capacitance − 4 − pF

I

sink

SDA sink current 3 −−mA

V

IH

HIGH level input voltage 3 − 5V

V

IL

LOW level input voltage 0 − 1.5 V

I

IH

HIGH level input current −−10 µA

I

IL

LOW level input current −−10 µA

Address D4H address D4H ADD

sel

= LOW 0 − 1V

Address D6H address D6H ADD

sel

= HIGH 3 − 5V

f

SCL

SCL frequency −−100 kHz

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1996 Mar 11 25

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

7. Maximum THD of 0.5%; 8 V < VP3< 13.2 V; 0 °C<T

amb

<70°C. Measured at pins 34 and 30; NR = off;

DEEM = flat.

8. Correction of output voltage is possible by correcting the volume level.

9. Measured at pins 37 and 27 with no electrolytic capacitors connected to these pins.

10. Input level of 0 dB; signal level in accordance with ∆fS1= ∆fS2= 50 kHz. At this input level, the NR response is equal
for high and low frequencies (see Fig.4).

11. J17 de-emphasis includes +6 dB amplification (see Fig.5).

12. Both PLLs locked.

INTERNAL CIRCUITRY

For description see Chapter “Pinning”.

SYMBOL PIN EQUIVALENT CIRCUIT

C

DC R

1

SLF 2

MLD094

1

1640 Ω

20 Ω

1640 Ω

20 Ω

MLD095

2

2 kΩ

2 kΩ 1 kΩ

2 kΩ

275 Ω

1996 Mar 11 26

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

BASEBAND IN 3

V

P1

4

IF OUT 5

SYNGND 6

IN-5 7

SYMBOL PIN EQUIVALENT CIRCUIT

3

MLD096

12.5 kΩ

2.5 V

4V

MLD060

P1

5

MLD061

MLD062

6

SYNGND

MLD063

7

275 Ω

1996 Mar 11 27

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

IN-6 8

IN-1 9

HFGND 10

IN-2 11

ADD

sel

12

SYMBOL PIN EQUIVALENT CIRCUIT

MLD097

8

275 Ω

MLD064

9

275 Ω

MLD065

10

HFGND

MLD066

11

275 Ω

MLD067

12

275 Ω

1996 Mar 11 28

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

IN-3 13

I2CGND 14

IN-4 15

V

P2

16

SCL 17

SDA 18

SYMBOL PIN EQUIVALENT CIRCUIT

MLD114

13

275 Ω

MLD068

14

I CGND

2

MLD098

15

275 Ω

MLD069

16

V

P2

MLD070

17

275 Ω

MLD071

18

275 Ω

1996 Mar 11 29

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

V

ref

19

V

P3

20

O

M

21

O

R

22

SYMBOL PIN EQUIVALENT CIRCUIT

MLD072

19

15.2 kΩ

40 kΩ

125 Ω

275 Ω

25 Ω

MLD073

20

V

P3

MLD074

125 Ω

21

3.8 V

MLD075

125 Ω

22

3.8 V

1996 Mar 11 30

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

O

L

23

EXT

R

24

EXT

L

25

C

ATT/RECR

26

SYMBOL PIN EQUIVALENT CIRCUIT

MLD076

125 Ω

23

3.8 V

MLD077

20 Ω 103 kΩ

3.8 V 3.8 V

24

I

O

I

O

transfer gate

transfer gate

47 kΩ

MLD078

20 Ω 103 kΩ

3.8 V 3.8 V

25

I

O

I

O

transfer gate

transfer gate

47 kΩ

26

MLD079

100 Ω

100 Ω

3.8 V

1996 Mar 11 31

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

RECT

R

27

C

NR D R

28

C

DR

29

DEEM OUT R 30

C

CL R

31

SYMBOL PIN EQUIVALENT CIRCUIT

MLD080

4.7 kΩ

27

28

MLD081

7.5 kΩ

275 Ω

AC signal current

MLD082

3.8 V

I

O

I

O

transfer gate

transfer gate

125 Ω

29

30

MLD083

20 Ω 103 kΩ

3.8 V 3.8 V

31

I

O

I

O

transfer gate

transfer gate

47 kΩ

1996 Mar 11 32

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

AFGND 32

C

CL L

33

DEEM OUT L 34
C

DL

35

C

NR D L

36

SYMBOL PIN EQUIVALENT CIRCUIT

MLD084

32

AFGND

substrate

MLD085

20 Ω 103 kΩ

3.8 V 3.8 V

33

I

O

I

O

transfer gate

transfer gate

47 kΩ

MLD086

3.8 V

I

O

I

O

transfer gate

transfer gate

125 Ω

35

34

36

MLD224

7.5 kΩ

275 Ω

AC signal current

1996 Mar 11 33

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

RECT

L

37

C

ATT/RECL

38

PRES DET R 39

XTAL 40

SYMBOL PIN EQUIVALENT CIRCUIT

MLD088

4.7 kΩ

37

38

MLD089

100 Ω

100 Ω

3.8 V

MLD090

39

100 Ω

100 Ω

40

MLD091

1996 Mar 11 34

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

PRES DET L 41

C

DC L

42

SYMBOL PIN EQUIVALENT CIRCUIT

MLD092

41

100 Ω

100 Ω

MLD093

42

1640 Ω

20 Ω

1640 Ω

20 Ω

1996 Mar 11 35

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

PACKAGE OUTLINES

UNIT b

1

cEe M

H

L

REFERENCES

OUTLINE
VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

DIMENSIONS (mm are the original dimensions)

SOT270-1

90-02-13
95-02-04

b

max.

w

M

E

e

1

1.3

0.8

0.53

0.40

0.32

0.23

38.9

38.4

14.0

13.7

3.2

2.9

0.181.778 15.24

15.80

15.24

17.15

15.90

1.73

5.08 0.51 4.0

M

H

c

(e )

1

M

E

A

L

seating plane

A

1

w M

b

1

e

D

A

2

Z

42

1

22

21

b

E

pin 1 index

0 5 10 mm

scale

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

(1) (1)

D

(1)

Z

A

max.

12

A

min.

A

max.

SDIP42: plastic shrink dual in-line package; 42 leads (600 mil)

SOT270-1

1996 Mar 11 36

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

UNIT A1A2A3b

p

cE

(1)

eH

E

LL

p

Zywv θ

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

0.25

0.05

1.85

1.65

0.25

0.40

0.20

0.25

0.14

10.1

9.9

0.8 1.3

12.9

12.3

1.2

0.8

10

0

o

o

0.15 0.10.15

DIMENSIONS (mm are the original dimensions)

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

0.95

0.55

SOT307-2

95-02-04
97-08-01

D

(1) (1)(1)

10.1

9.9

H

D

12.9

12.3

E

Z

1.2

0.8

D

e

E

B

11

c

E

H

D

Z

D

A

Z

E

e

v M

A

X

1

44

34

33 23

22

12

y

θ

A

1

A

L

p

detail X

L

(A )

3

A

2

pin 1 index

D

H

v M

B

b

p

b

p

w M

w M

0 2.5 5 mm

scale

QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm

SOT307-2

A

max.

2.10

1996 Mar 11 37

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

SOLDERING
Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

“IC Package Databook”

(order code 9398 652 90011).

SDIP

SOLDERING BY DIPPING OR BY WA VE
The maximum permissible temperature of the solder is

260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.

The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T

stg max

). If the
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.

R

EPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.

QFP

REFLOW SOLDERING
Reflow soldering techniques are suitable for all QFP

packages.
The choice of heating method may be influenced by larger

plastic QFP packages (44 leads, or more). If infrared or
vapour phase heating is used and the large packages are
not absolutely dry (less than 0.1% moisture content by
weight), vaporization of the small amount of moisture in
them can cause cracking of the plastic body. For more
information, refer to the Drypack chapter in our

“Quality

Reference Handbook”

(order code 9397 750 00192).

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary from
50 to 300 seconds depending on heating method. Typical
reflow temperatures range from 215 to 250 °C.

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheat for 45 minutes at 45 °C.

W

AVE SOLDERING

Wave soldering is not recommended for QFP packages.
This is because of the likelihood of solder bridging due to
closely-spaced leads and the possibility of incomplete
solder penetration in multi-lead devices.

If wave soldering cannot be avoided, the following
conditions must be observed:

• A double-wave (a turbulent wave with high upward

pressure followed by a smooth laminar wave)
soldering technique should be used.

• The footprint must be at an angle of 45° to the board

direction and must incorporate solder thieves
downstream and at the side corners.

Even with these conditions, do not consider wave
soldering the following packages: QFP52 (SOT379-1),
QFP100 (SOT317-1), QFP100 (SOT317-2),
QFP100 (SOT382-1) or QFP160 (SOT322-1).

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured. Maximum permissible solder
temperature is 260 °C, and maximum duration of package
immersion in solder is 10 seconds, if cooled to less than
150 °C within 6 seconds. Typical dwell time is 4 seconds
at 250 °C.

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

R

EPAIRING SOLDERED JOINTS

Fix the component by first soldering two diagonally­opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.

1996 Mar 11 38

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

PURCHASE OF PHILIPS I

2

C COMPONENTS

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

Purchase of Philips I

2

C components conveys a license under the Philips’ I2C patent to use the
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.

1996 Mar 11 39

Philips Semiconductors Preliminary specification

Satellite sound receiver with I2C-bus control

TDA8745

NOTES

Philips Semiconductors – a worldwide company

Argentina: IEROD, Av. Juramento 1992 - 14.b, (1428)

BUENOS AIRES, Tel. [phone], Fax. [phone]

Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,

Tel. [phone], Fax. [phone]

Austria: Triester Str. 64, A-1101 WIEN, P.O. Box 213,

Tel. [phone], Fax. [phone]

Belgium: Postbus 90050, 5600 PB EINDHOVEN, The Netherlands,

Tel. [phone], Fax. [phone]

Brazil: Rua do Rocio 220 - 5

th

floor, Suite 51,
CEP: 04552-903-SÃO PAULO-SP, Brazil,
P.O. Box 7383 (01064-970),
Tel. [phone], Fax. [phone]

Canada: PHILIPS SEMICONDUCTORS/COMPONENTS:

Tel. [phone], Fax. [phone]

Chile: Av. Santa Maria 0760, SANTIAGO,

Tel. [phone], Fax. [phone]

China/Hong Kong: 501 Hong Kong Industrial Technology Centre,

72 Tat Chee Avenue, Kowloon Tong, HONG KONG,
Tel. [phone], Fax. [phone]

Colombia: IPRELENSO LTDA, Carrera 21 No. 56-17,

77621 BOGOTA, Tel. [phone],
Fax. [phone]

Denmark: Prags Boulevard 80, PB 1919, DK-2300

COPENHAGEN S, Tel. [phone], Fax. [phone]

Finland: Sinikalliontie 3, FIN-02630 ESPOO,

Tel. [phone], Fax. [phone]

France: 4 Rue du Port-aux-Vins, BP317,

92156 SURESNES Cedex,
Tel. [phone], Fax. [phone]

Germany: P.O. Box 10 51 40, 20035 HAMBURG,

Tel. [phone], Fax. [phone]

Greece: No. 15, 25th March Street, GR 17778 TAVROS,

Tel. [phone] 911, Fax. [phone]

India: Philips INDIA Ltd, Shivsagar Estate, A Block,

Dr. Annie Besant Rd. Worli, Bombay 400 018
Tel. [phone], Fax. [phone]

Indonesia: Philips House, Jalan H.R. Rasuna Said Kav. 3-4,

P.O. Box 4252, JAKARTA 12950,
Tel. [phone], Fax. [phone]

Ireland: Newstead, Clonskeagh, DUBLIN 14,

Tel. [phone], Fax. [phone]

Italy: PHILIPS SEMICONDUCTORS S.r.l.,

Piazza IV Novembre 3, 20124 MILANO,
Tel. [phone], Fax. [phone]

Japan: Philips Bldg13-37, Kohnan 2-chome, Minato-ku, TOKYO 108,

Tel. [phone], Fax. [phone]

Korea: Philips House, 260-199 Itaewon-dong,

Yongsan-ku, SEOUL, Tel. [phone], Fax. [phone]

Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA,

SELANGOR, Tel. [phone], Fax. [phone]

Mexico: 5900 Gateway East, Suite 200, EL PASO, TX 79905,

Tel. [phone], Fax. [phone]

Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB,

Tel. [phone], Fax. [phone]

New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND,

Tel. [phone], Fax. [phone]

Norway: Box 1, Manglerud 0612, OSLO,

Tel. [phone], Fax. [phone]

Pakistan: Philips Electrical Industries of Pakistan Ltd.,

Exchange Bldg. ST-2/A, Block 9, KDA Scheme 5, Clifton,
KARACHI 75600, Tel. [phone],
Fax. [phone]

Philippines: PHILIPS SEMICONDUCTORS PHILIPPINES Inc.,

106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI,
Metro MANILA, Tel. [phone], Fax. [phone]

Portugal: PHILIPS PORTUGUESA, S.A.,

Rua dr. António Loureiro Borges 5, Arquiparque - Miraflores,
Apartado 300, 2795 LINDA-A-VELHA,
Tel. [phone], Fax. [phone]

Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231,

Tel. [phone], Fax. [phone]

South Africa: S.A. PHILIPS Pty Ltd.,

195-215 Main Road Martindale, 2092 JOHANNESBURG,
P.O. Box 7430, Johannesburg 2000,
Tel. [phone], Fax. [phone]

Spain: Balmes 22, 08007 BARCELONA,

Tel. [phone], Fax. [phone]

Sweden: Kottbygatan 7, Akalla. S-164 85 STOCKHOLM,

Tel. [phone], Fax. [phone]

Switzerland: Allmendstrasse 140, CH-8027 ZÜRICH,

Tel. [phone], Fax. [phone]

Taiwan: PHILIPS TAIWAN Ltd., 23-30F, 66, Chung Hsiao West

Road, Sec. 1. Taipeh, Taiwan ROC, P.O. Box 22978,
TAIPEI 100, Tel. [phone], Fax. [phone]

Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd.,

209/2 Sanpavuth-Bangna Road Prakanong,
Bangkok 10260, THAILAND,
Tel. [phone], Fax. [phone]

Turkey:Talatpasa Cad. No. 5, 80640 GÜLTEPE/ISTANBUL,

Tel. [phone], Fax. [phone]

Ukraine: Philips UKRAINE, 2A Akademika Koroleva str., Office 165,

252148 KIEV, Tel.[phone], Fax. [phone]

United Kingdom: Philips Semiconductors LTD.,

276 Bath Road, Hayes, MIDDLESEX UB3 5BX,
Tel. [phone], Fax. [phone]

United States:811 East Arques Avenue, SUNNYVALE,

CA 94088-3409, Tel. [phone], Fax. [phone]

Uruguay: Coronel Mora 433, MONTEVIDEO,

Tel. [phone], Fax. [phone]

Internet: http://www.semiconductors.philips.com/ps/
For all other countries apply to: Philips Semiconductors,

International Marketing and Sales, Building BE-p,
P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands,
Telex 35000 phtcnl, Fax. [phone]

SCDS47 © Philips Electronics N.V. 1996

All rights are reserved. Reproduction in whole or in part is prohibited without the
prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation
or contract, is believed to be accurate and reliable and may be changed without
notice. No liability will be accepted by the publisher for any consequence of its
use. Publication thereof does not convey nor imply any license under patent- or
other industrial or intellectual property rights.

Printed in The Netherlands

537021/1100/02/pp40 Date of release: 1996 Mar 11
Document order number: 9397 750 00723