Philips TEA5757H-V1 Datasheet

DATA SH EET

Product specification
Supersedes data of 1996 Jan 09
File under Integrated Circuits, IC01

1999 Aug 26

INTEGRATED CIRCUITS

TEA5757; TEA5759

Self Tuned Radio (STR)

1999 Aug 26 2

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

FEATURES

• The tuningsystem has an optimized IC partitioning both
from application (omitting interferences) and flexibility
(removable front panel option) point of view: the tuning
synthesizer is on-chip with the radio

• Thetuning quality issuperior and requiresno IF-counter
for stop-detection; it is insensitive to ceramic filter
tolerances

• In combination with the microcontroller, fast, low-power
operation of preset mode, manual-search, auto-search
and auto-store are possible

• Thelocal (internal) controller functionfacilitatesreduced
and simplified microcontroller software

• The high integration level (radio and tuning synthesizer
on one chip) means fewer external components with
regard to the communication between the radio and the
microcontroller (90% less components compared to the
digital tuning application of a radio IC with external PLL
tuning function) and a simple and small printed-circuit
board

• Therewill be no applicationconsiderationsfor the tuning
system, with regards to quality and high integration
level, since there will be no external 110 MHz buffers,
loop filter or false lock elimination

• The inherent FUZZY LOGIC behaviour of the Self
Tuned Radio (STR), whichmimics hand tuning, yields a
potentially fast yet reliable tuning operation

• The level of the incoming signal at which the radio must
lock is software programmable

• Two programmable ports

• High selectivity with distributed IF gain

• Soft mute

• Signal dependent stereo-blend

• High impedance MOSFET input on AM

• Wide supply voltage range of 2.5 to 12 V

• Low current consumption 18 mA at AM and FM

(including tuning synthesizer)

• High input sensitivity

• Low output distortion

• Due to the new tuning concept, the tuning is

independent of the channel spacing.

GENERAL DESCRIPTION

The TEA5757; TEA5759 is a 44-pin integrated AM/FM
stereo radio circuit including a novel tuning concept.
The radio part is based on the TEA5712.

The TEA5757 is used in FM-standards in which the local
oscillator frequency is above the radio frequency
(e.g. European and American standards).

The TEA5759 is the version in which the oscillator
frequency is below the radio frequency
(e.g. Japanese standard).

Thenew tuning conceptcombinesthe advantages ofhand
tuning with electronic facilities and features. User
‘intelligence’ is incorporated into the tuning algorithm and
animprovementofthe analog signal processing isusedfor
the AFC function.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TEA5757H QFP44 plastic quad flat package;44 leads (lead length 1.3 mm); body

10 × 10 × 1.75 mm

SOT307-2

TEA5759H

1999 Aug 26 3

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

QUICK REFERENCE DATA

Notes

1. V

CC1

=3V;V

CC2

=12V;V

DDD

=3V;fi= 1 MHz; m = 0.3; fm= 1 kHz; measured in Fig.9 with S1 in position A andS2

in position B; Vn refers to pin voltages; V

i(n)

refers to test circuit (see Fig.9).

2. V

CC1

=3V; V

CC2

= 12 V; V

DDD

=3V; fi= 100 MHz; ∆fm= 22.5 kHz; fm= 1 kHz; measured in Fig.9 with S2, S3

and S5 in position A; Vn refers to pin voltages; V

i(n)

refers to test circuit (see Fig.9).

3. V

CC1

=3V; V

CC2

= 12 V; V

DDD

=3V; V

i3(L + R)

= 155 mV; V

pilot

= 15.5 mV; fi= 1 kHz; measured in Fig.9 with S2

and S3 in position B.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC1

supply voltage 2.5 − 12 V

V

CC2

supply voltage for tuning −−12 V

V

tune

tuning voltage 0.7 − V

CC2

− 0.75 V

I

CC1

supply current AM mode 12 15 18 mA

FM mode 13 16 19 mA

I

DD

supply current AM mode − 3.3 − mA

FM mode − 2.7 − mA

I

CC2

supply current for tuning in preset
mode (band-end to band-end)

−−800 µA

T

amb

ambient temperature −15 − +60 °C
AM performance; note 1
V

10

AF output voltage Vi1=5mV 364570 mV
V

i1

RF sensitivity input voltage (S+N)/N = 26 dB 40 55 70 µV
THD total harmonic distortion V

i1

=1mV − 0.8 2.0 %
FM performance; note 2
V

10

AF output voltage Vi5=1mV 404857 mV

V

i5

RF limiting sensitivity V10at −3 dB;

V10is 0 dB at Vi5=1mV

0.4 1.2 3.8 µV

THD total harmonic distortion IF filter

SFE10.7MS3A20K-A

− 0.3 0.8 %

MPX performance; note 3

α

cs

channel separation 26 30 − dB

1999 Aug 26 4

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

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BLOCK DIAGRAM

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PRESCALER

PROGRAMMABLE

COUNTER

STABILIZER

WINDOW

DETECTOR

LAST-STATION

MEMORY

AM/FM

INDICATOR

IN-LOCK

DETECTOR

FM

DETECTOR

PILOT

DETECTOR

CHARGE

PUMP

MULTIPLEXER

CRYSTAL

OSCILLATOR

SHIFT REGISTER

FM

FRONT-END

FM

OSCILLATOR

FM
IF2

FM
IF1

FM

MIXER

SEQUENTIAL

CIRCUIT

STATUS

REGISTER

AM

FRONT-END

AM

OSCILLATOR

AM

DETECTOR

V/I

CONVERTER

AM

MIXER

AM

IF

AGC

AFC

hard mute

level

PLL

DECODER

MATRIX

SDS

MUTE

up

down

level

RFGND

DATA

BUS-CLOCK

WRITE-ENABLE

FM-RFI

V

STAB(A)

V

STAB(B)

AM-RFI

XTAL

RIPPLE

25

23
1

26

30

31

2

AGC

AM-IFI/O2

AM-MIXERAMOSC

AM-IFI1

6

40 41

36 44

822

32

20

19

13

15

14

9

12

24

16

181739 37 333535

38

43
42

28
27
29

34
7

21

10

11

4

MO/ST

AFRO

MUTE

AFC

(n)

AFC

(p)

AFC

VCO

LFI

PILFIL

AFLO

stereo

stereo

mono

38 kHz

19 kHz

FM-IFI1 FM-IFI2

FM-IFO1

FM-MIXER

FMOSC

FM-RFO

V

CC1

V

DDD

TEA5757;

TEA5759

FM

AM

DGND

P1
P0

TUNE

RFGND

MPXI

AFO

V

CC2

IFGND FSIFMDEM

MHA111

Fig.1 Block diagram.

1999 Aug 26 5

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

PINNING

SYMBOL PIN DESCRIPTION

RIPPLE 1 ripple capacitor input
AM-RFI 2 AMRF input
FM-RFO 3 parallel tuned FMRF circuit to ground
RFGND 4 RF ground and substrate
FMOSC 5 parallel tuned FM-oscillator circuit to ground
AMOSC 6 parallel tuned AM-oscillator circuit to ground
V

CC1

7 supply voltage
TUNE 8 tuning current output
VCO 9 voltage controlled oscillator input
AFO 10 AM/FM AF output (output impedance typical 5 kΩ)
MPXI 11 stereo decoder input (input impedance typical 150 kΩ)
LFI 12 loop-filter input
MUTE 13 mute input
AFLO 14 left channel output (output impedance typical 4.3 kΩ)
AFRO 15 right channel output (output impedance typical 4.3 kΩ)
PILFIL 16 pilot detector filter input
IFGND 17 ground of IF, detector and MPX stage
FMDEM 18 ceramic discriminator input
AFC

(n)

19 AFC negative output

AFC

(p)

20 AFC positive output
FSI 21 field-strength indicator
V

CC2

22 supply voltage for tuning
V

DDD

23 digital supply voltage
MO/ST 24 mono/stereo and tuning indication output
XTAL 25 crystal input
DGND 26 digital ground
BUS-CLOCK 27 bus-clock input
DATA 28 bus data input/output
WRITE-ENABLE 29 bus write-enable input
P0 30 programmable output port (P0)
P1 31 programmable output port (P1)
AFC 32 450 kHz LC-circuit
FM-IFI2 33 FMIF input 2 (input impedance typical 330 Ω)
V

STAB(B)

34 internal stabilized supply voltage (B)
FM-IFO1 35 FMIF output 1 (output impedance typical 330 Ω)
AM-IFI/O2 36 input/output to IF-Tank (IFT); output: current source
FM-IFI1 37 FMIF input 1 (input impedance typical 330 Ω)
V

STAB(A)

38 internal stabilized supply voltage (A)
FM-MIXER 39 ceramic filter output (output impedance typical 330 Ω)
AM-MIXER 40 open-collector output to IFT

1999 Aug 26 6

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

AM-IFI1 41 IFT or ceramic filter input (input impedance typical 3 kΩ)
RFGND 42 FMRF ground
FM-RFI 43 FMRF aerial input (input impedance typical 40 Ω)
AGC 44 AGC capacitor input

SYMBOL PIN DESCRIPTION

Fig.2 Pin configuration.

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TEA5757H
TEA5759H

MHA112

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

RIPPLE

AM-RFI

FM-RFO

RFGND
FMOSC

AMOSC

V

CC1

TUNE

VCO

AFO

MPXI

FM-IFI2
AFC
P1
P0
WRITE-ENABLE
DATA

BUS-CLOCK

DGND
XTAL
MO/ST
V

DDD

LFI

MUTE

AFLO

AFRO

PILFIL

IFGND

FMDEM

AFC

(n)

AFC

(p)

FSI

V

CC2

AGC

FM-RFI

RFGND

AM-IFI1

AM-MIXER

FM-MIXER

V

STAB(A)

FM-IFI1

AM-IFI/O2

FM-IFO1

V

STAB(B)

1999 Aug 26 7

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

FUNCTIONAL DESCRIPTION

The TEA5757; TEA5759 is an integrated AM/FM stereo
radio circuit including digital tuning and control functions.

The radio

The AM circuit incorporates a double balanced mixer,
a one-pin low-voltage oscillator (up to 30 MHz) and is
designed for distributed selectivity.

The AM input is designed to be connected to the top of
a tuned circuit. AGC controls the IF amplification and for
large signals it lowers the input impedance of the
AM front-end.

The first AM selectivity can be an IF-Tank (IFT) as well as
an IFT combined with a ceramic filter; the second one is
an IFT.

The FM circuit incorporates a tuned RF stage, a double
balanced mixer, a one-pin oscillator and is designed for
distributed IF ceramic filters. The FM quadrature detector
uses a ceramic resonator (or LC).

The PLL stereo decoder incorporates a signal dependent
stereo-blend circuit and a soft-mute circuit.

Tuning

The tuning concept of the Self Tuned Radio (STR) is
based on FUZZY LOGIC: it mimics hand tuning (hand
tuning is a combination of coarse and fine tuning to the
qualitatively best frequency position). As a consequence
the tuning system is very fast.

The tuning algorithm, which is controlled by the sequential
circuit (see Fig.1), is completely integrated; so there are
only a few external components needed.

The bus and the microcontroller can be kept very simple.
The bus only consists of three wires (BUS-CLOCK, DATA
and WRITE-ENABLE). The microcontroller must basically
give two instructions:

• Preset operation

• Search operation.

PRESET OPERATION
Inpreset mode, themicrocontroller has toload information

suchas frequency band,frequency and mono/stereo.This
information has to be sent via the bus to the STR.
The internal algorithm controls the tuning sequence as
follows:

1. The information is loaded into the shift register, the
last-station memory and the counter.

2. The Automatic Frequency Control (AFC) is
switched off.

3. The counter starts counting the frequency and the
tuning voltage is varied until the desired frequency
roughly equals the real frequency.

4. The AFC is then switched on and the counter is
switched off.

5. The real frequency is more precisely tuned to the
desired frequency.

After the AFC has tuned the real frequency to the desired
frequency an in-lock signal can be generated. In order to
get a reliable in-lock signal, there are two parameters
measured: the field strength and the S-curve. The field
strength indicates the strength of the station and by
looking at the S-curve the system can distinguish false
in-locks from real in-locks (false in-locks occur on the
wrong slope of the S-curve).

In the event of fading orpulling thein-lock signal becomes
logic 0 and the synthesizer will be switched on again and
the algorithm will be repeated.

SEARCH OPERATION
During a search operation, the only action the

microcontroller has to take is: sending the desired band
plus the direction and the search sensitivity level to the
STR. The search operation is performed by the charge
pump until an in-lock signal is generated (combination of
measuring the field strength and the S-curve). The AFC
then fine tunes to the station. The frequency belonging to
thefound station willbecounted by the counterand written
into the last-station memory and the shift register of the
counter. At this time the frequency is available in the shift
register and can be read by the microcontroller.
The microcontroller decides whether the frequency is
withinthedesired frequency band. Ifso,thisfrequency can
be stored under a preset and if not, a new search action
should be started.

To ensure that the search function operates correctly
under all conditions the following search sequence must
be applied:

• Store the current frequency in the memory

• Issue the search command

• Wait for data valid and read the new frequency

• If the new frequency is the same as the stored

frequency, issue a pre-set step (e.g. 50 kHz) and start
the search sequence again.

1999 Aug 26 8

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

Description of the bus

The TEA5757; TEA5759radio has abus whichconsists of
three wires, as shown in Table 1.

Table 1 Bus signals

These three signals, together with the mono/stereo pin
(MO/ST; pin 24), communicate with the microcontroller.
The mono/stereo indicator has two functions, which are
controlled by the BUS-CLOCK, as shown in Table 2.

Table 2 Bus-clock functions

The TEA5757; TEA5759 has a 25-bit shift register;
see Table 3 for an explanation of the shift register bits.

If in search mode no transmitter can be found, all
frequency bits of the shift register are set to logic 0.

The bus protocol is depicted in Figs 3 and 4.

SIGNAL DESCRIPTION PIN

BUS-CLOCK software driven clock input 27
DATA data input/output 28
WRITE-ENABLE write/read input 29

BUS-CLOCK MO/ST (PIN 24) RESULT

LOW LOW stereo
LOW HIGH mono
HIGH LOW tuned
HIGH HIGH not tuned

Table 3 Explanation of the shift register bits

Note

1. The output pins 30 and 31 can drive currents up to 5 mA; bits P0.19 and P1.18 control the output voltage of the
control pins P0 (pin 30) and P1 (pin 31):

a) Bit P0.19 LOW sets P0 (pin 30) to LOW.
b) Bit P0.19 HIGH sets P0 (pin 30) to HIGH.
c) Bit P1.18 LOW sets P1 (pin 31) to LOW.
d) Bit P1.18 HIGH sets P1 (pin 31) to HIGH.

BIT DESCRIPTION

LOGIC
STATE

RESULT

S.24 (MSB) search start/end 0 after a search when a station is found or after a preset

1 during the search action

D.23 search up/down 0 indicates if the radio has to search down

1 indicates if the radio has to search up

M.22 mono/stereo 0 stereo is allowed

1 mono is required (radio switched to forced mono)
B0.21 band see Table 4 selects FM/MW/LW/SW band
B1.20
P0.19 port note 1 userprogrammable bits which e.g. can be used as band

switch driver

P1.18
S0.17 search-level of station see Table 5 determines the locking field strength during an

automatic search, automatic store or manual search

S1.16
15 dummy − buffer
F.14 to F.0 (LSB) frequency − determine the tuning frequency of the radio; see Table 6

for the bit values

1999 Aug 26 9

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

Table 4 Truth table for bits B0.21 and B1.20

Table 5 Truth table for bits S1.16 and S0.17

Table 6 Values for bits F.14 to F.0

Notes

1. FM value of the affected oscillators:
a) FM VALUE = FMRF + FMIF (for TEA5757).
b) FM VALUE = FMRF − FMIF (for TEA5759).

2. AM value of the affected oscillators:
AM VALUE = AMRF + AMIF.

B0.21 B1.20 BAND SELECT

00FM
01MW
10LW
11SW

S1.16 S0.17

SIGNAL RECEPTION
FM

(µV)

AM

(µV)

0 0 >5 >28
0 1 >10 >40
1 0 >30 >63
1 1 >150 >1000

BIT BIT VALUEFMVALUE

(1)

(kHz)

AM

VALUE

(2)

(kHz)

F.14 2

14

− 16384

F.13 2

13

102400 8192

F.12 2

12

51200 4096

F.11 2

11

25600 2048

F.10 2

10

12800 1024

F.9 2

9

6400 512

F.8 2

8

3200 256

F.7 2

7

1600 128

F.6 2

6

800 64

F.5 2

5

400 32

F.4 2

4

200 16

F.3 2

3

100 8

F.2 2

2

50 4

F.1 2

1

25 2

F.0 2

0

12.5 1

1999 Aug 26 10

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757; TEA5759

READING DATA
While WRITE-ENABLE is LOW data can be read by the

microcontroller. At a rising edge of the BUS-CLOCK, data
is shifted out of the register. This data is available from the
point where the BUS-CLOCK is HIGH until the next rising
edge of the BUS-CLOCK occurs (see Fig.3).

To read the entire shift register 24 clock pulses are
necessary.

WRITING DATA
While WRITE-ENABLE is HIGH the microcontroller can

transmit data to the TEA5757; TEA5759 (hard mute is
active). At a rising edge of the BUS-CLOCK, the register
shifts and accepts one bit into LSB. At clock LOW the
microcontroller writes data (see Fig.4).

To write the entire shift register 25 clock pulses are
necessary.

Fig.3 Read data.

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WRITE-ENABLE

BUS-CLOCK

DATA

data read

data available

data shiftdata available after search ready

MSB is LOW

MBE817

Fig.4 Write data.

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data changedata shift

MBE818

WRITE-ENABLE

BUS-CLOCK

DATA