Philips TEA5759HL, TEA5757HL Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TEA5757HL; TEA5759HL

Self Tuned Radio (STR)

Product specification
File under Integrated Circuits, IC01

2000 Feb 02

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

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 (PCB)

• 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), which mimics hand tuning and
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

• FM-on/off port to control an external FM front-end

• 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 TEA5757HL; TEA5759HL is a 48-pin integrated
AM/FM stereo radio circuit including a novel tuning
concept. The radio part is based on the TEA5712.

The TEA5757HL is used in FM-standards in which the
local oscillator frequency is above the radio frequency
(e.g. european and american standards).

The TEA5759HL 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

TEA5757HL LQFP48 plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm SOT313-2
TEA5759HL LQFP48 plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm SOT313-2

2000 Feb 02 2

NAME DESCRIPTION VERSION

PACKAGE

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC1

V

CC2

V

tune

I

CC1

I

DD

I

CC2

T

amb

AM performance; note 1
V

11

V

i1

THD total harmonic distortion V
FM performance; note 2
V

11

V

i5

THD total harmonic distortion IF filter

MPX performance; note 3

α

cs

supply voltage 2.5 − 12 V
supply voltage for tuning −−12 V
tuning voltage 0.7 − V

− 0.75 V

CC2

supply current AM mode 12 15 18 mA

FM mode 13 16 19 mA

supply current AM mode 2.8 3.3 3.7 mA

FM mode 2.4 2.7 3.0 mA

supply current for tuning in

−−800 µA
preset mode
(band-end to band-end)

ambient temperature −15 − +60 °C

AF output voltage Vi1= 5 mV 36 45 70 mV
RF sensitivity input voltage (S+N)/N = 26 dB 40 55 70 µV

=1mV − 0.8 2.0 %

i1

AF output voltage Vi5= 1 mV 40 48 57 mV
RF sensitivity input voltage V11at −3 dB; V11is 0 dB

0.4 1.2 3.8 µV

at Vi5=1mV

− 0.3 0.8 %

SFE10.7MS3A20K-A

channel separation 26 30 − dB

Notes

1. V

CC1

=3V; V

CC2

= 12 V; V

=3V; fi= 1 MHz; m = 0.3; fm= 1 kHz; measured in Fig.11 with S1 in position A; S2

DDD

in position B; unless otherwise specified.

2. V

CC1

=3V; V

CC2

= 12 V; V

=3V; fi= 100 MHz; ∆fm= 22.5 kHz; fm= 1 kHz; measured in Fig.11 with S2 in

DDD

position A; S3 in position A and S5 in position A; unless otherwise specified.

3. V

CC1

=3V;V

CC2

=12V;V

DDD

=3V;V

i3(L + R)

= 155 mV; V

= 15.5 mV; fi= 1 kHz; measured in Fig.11 with S2 in

pilot

position B; S3 in position B; unless otherwise specified.

2000 Feb 02 3

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2000 Feb 02 4

FM-IFI1 FM-IFI2

FM-IFO1FM-MIXERFMOSC/COUNTI

FM
IF1

STATUS

REGISTER

SEQUENTIAL

CIRCUIT

AM

IF

AGC

up
down
level

FM
IF2

AM/FM

INDICATOR

IN-LOCK

DETECTOR

CHARGE

PUMP

hard mute

DETECTOR

IFGND FSIFMDEM

FM

DETECTOR

AFC

AM

191843 40 363836

22

TEA5757HL;

TEA5759HL

19 kHz

38 kHz

stereo

level

CONVERTER

PILOT

DETECTOR

PLL

DECODER

stereo

MATRIX

mono

SDS

MUTE

V/I

17
26

13
10

15
16

14

20
21
34

FM-RFI

RFGND2

DATA

BUS-CLOCK

WRITE-ENABLE

V

STAB(A)

V

STAB(B)

V

CC1

V

DDD

RIPPLE

FM-ON/OFF

XTAL

DGND

AM-RFI

FM-RFO

47
46

30
29
31

41
37
8
25
1

42

27
28

33

P1

32

P0

2

FM

FRONT-END

STABILIZER

PRESCALER

MULTIPLEXER

CRYSTAL

OSCILLATOR

AM

FRONT-END

OSCILLATOR

TUNER

SWITCH

OSCILLATOR

FM

SHIFT REGISTER

LAST-STATION

MEMORY

PROGRAMMABLE

COUNTER

WINDOW

DETECTOR

AM

FM

MIXER

AM

MIXER

FM

AM

PILFIL
MO/ST

LFI
VCO

AFLO
AFRO

MUTE

AFC
AFC
AFC

BLOCK DIAGRAM

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

(n)
(p)

7

AM-MIXERAMOSC

44 45

AM-IFI1

39

AM-IFI/O2

AGC

48

TUNE

923

AFO

V

CC2

11

MPXI

12

4

RFGND1

MHB606

Fig.1 Block diagram.

handbook, full pagewidth

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

PINNING

SYMBOL PIN DESCRIPTION

RIPPLE 1 ripple capacitor input
AM-RFI 2 AMRF input
FM-RFO 3 parallel tuned FMRF circuit to ground
RFGND1 4 RF ground 1 and substrate
CGND 5 counter ground
FMOSC/COUNTI 6 parallel tuned FM-oscillator circuit to ground/counter input
AMOSC 7 parallel tuned AM-oscillator circuit to ground
V

CC1

TUNE 9 tuning current output
VCO 10 voltage controlled oscillator input
AFO 11 AM/FM AF output (output impedance typical 5 kΩ)
MPXI 12 stereo decoder input (input impedance typical 150 kΩ)
LFI 13 loop filter input
MUTE 14 mute input
AFLO 15 left channel output (output impedance typical 4.3 kΩ)
AFRO 16 right channel output (output impedance typical 4.3 kΩ)
PILFIL 17 pilot detector filter input
IFGND 18 ground of IF, detector and MPX stage
FMDEM 19 ceramic discriminator input
AFC

(n)

AFC

(p)

FSI 22 field strength indicator
V

CC2

n.c. 24 not connected
V

DDD

MO/ST 26 mono/stereo and tuning indication output
XTAL 27 crystal input
DGND 28 digital ground
BUS-CLOCK 29 bus-clock input
DATA 30 bus data input/output
WRITE-ENABLE 31 bus write-enable input
P0 32 programmable output port (P0)
P1 33 programmable output port (P1)
AFC 34 450 kHz LC circuit
n.c. 35 not connected
FM-IFI2 36 FMIF input 2 (input impedance typical 330 Ω)
V

STAB(B)

FM-IFO1 38 FMIF output 1 (output impedance typical 330 Ω)
AM-IFI/O2 39 input/output to IF-Tank (IFT); output: current source
FM-IFI1 40 FMIF input 1 (input impedance typical 330 Ω)

8 supply voltage

20 AFC negative output
21 AFC positive output

23 supply voltage for tuning

25 digital supply voltage

37 internal stabilized supply voltage (B)

2000 Feb 02 5

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

SYMBOL PIN DESCRIPTION

V

STAB(A)

FM-ON/OFF 42 FM ON/OFF port
FM-MIXER 43 ceramic filter output (output impedance typical 330 Ω)
AM-MIXER 44 open-collector output to IFT
AM-IFI1 45 IFT or ceramic filter input (input impedance typical 3 kΩ)
RFGND2 46 FMRF ground 2
FM-RFI 47 FMRF aerial input (input impedance typical 40 Ω)
AGC 48 AGC capacitor input

handbook, full pagewidth

41 internal stabilized supply voltage (A)

RIPPLE

AM-RFI

FM-RFO

RFGND1

CGND

FMOSC/COUNTI

AMOSC

V

CC1

TUNE

VCO

AFO

MPXI

AGC

FM-RFI

RFGND2

AM-IFI1

AM-MIXER

FM-MIXER

48

47

46

45

44

43

1
2
3
4
5
6
7
8

9
10
11
12

13

14

15

LFI

MUTE

AFLO

TEA5757HL;

TEA5759HL

16

17

AFRO

PILFIL

18

IFGND

STAB(A)

FM-ON/OFF

V

42

41

20

19

(n)

AFC

FMDEM

FM-IFI1
40

21

(p)

AFC

AM-IFI/O2
39

22
FSI

STAB(B)

FM-IFO1

V

38

37

23

24
n.c.

CC2

V

36

FM-IFI2

35

n.c.

34

AFC

33

P1

32

P0

31

WRITE-ENABLE

30

DATA

29

BUS-CLOCK

28

DGND

27

XTAL

26

MO/ST

25

V

DDD

MHB607

Fig.2 Pin configuration.

2000 Feb 02 6

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

FUNCTIONAL DESCRIPTION

The TEA5757HL; TEA5759HL 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
anIFT combined withaceramic filter; thesecond 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.

The TEA5757HL; TEA5759HL can also be used with an
external FM front-end circuit. The external front-end is
activatedby the FM-ON/OFF signal. The AFC circuit in the
TEA5757HL; TEA5759HL provides a tuning voltage to
drive the VCOof the externalFM front-end.The frequency
of the external VCO is counted in the Self Tuned Radio
(STR) tuning system.

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

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 a shift register, a
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

Tuning

Thetuning concept of Self TunedRadio (STR) isbased 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.

2000 Feb 02 7

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.

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

Toensure that the search functionoperates correctly underall conditions thefollowing search sequencemust 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 preset step (e.g. 50 kHz) and start the search

sequence again.

TUNING CURRENTS FOR DIFFERENT CONDITIONS

handbook, full pagewidth

I

9
I

B

I

A

−I

A

−I

B

R

R

W

2

W

1

f

c

R R

f

MHB641

Fig.3 Tuning currents.

Table 1 Tuning currents

BAND

SELECT

W

1

(kHz)

W

2

(kHz)

R

(kHz)

MIN. TYP. MAX. MIN. TYP. MAX.

IA (µA) IB (µA)

FM 25 200 12.5 2 2.5 3 54 80 100

MW 3 64 1 2 2.5 3 54 80 100

LW 1 64 1 2 2.5 3 54 80 100

SW 1 64 1 0.4 0.5 0.7 12 16 20

2000 Feb 02 8

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

Description of the bus

The TEA5757HL; TEA5759HL radio has a bus which
consists of three wires, as shown in Table 2.

Table 2 Bus signals

SIGNAL DESCRIPTION PIN

BUS-CLOCK software driven clock input 29
DATA data input/output 30
WRITE-ENABLE write/read input 31

These three signals, together with the mono/stereo pin
(MO/ST; pin 26), communicate with the microcontroller.
The mono/stereo indicator has two functions, which are
controlled by the BUS-CLOCK, as shown in Table 3.

Table 4 Explanation of the shift register bits

BIT DESCRIPTION

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

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

M.22 mono/stereo 0 stereo is allowed

B0.21 band see Table 5 selects FM/MW/LW/SW band
B1.20 band see Table 5 selects FM/MW/LW/SW band
P0.19 port note 1 user programmable bits which e.g. can be used as

P1.18 port note 1 user programmable bits which e.g. can be used as

S0.17 search-level of station see Table 6 determines the locking field strength during an

S1.16 search-level of station see Table 6 determines the locking field strength during an

15 dummy − buffer
F.14 to F.0 (LSB) frequency − determine the tuning frequency of the radio;

LOGIC
STATE

1 during the search action

1 indicates if the radio has to search up

1 mono is required (radio switched to forced mono)

Table 3 Bus-clock functions

BUS-CLOCK MO/ST (PIN 26) RESULT

LOW LOW stereo

LOW HIGH mono
HIGH LOW tuned
HIGH HIGH not tuned

The TEA5757HL; TEA5759HL has a 25-bit shift register;
see Table 4 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 illustrated in Figs 4 and 5.

RESULT

band switch driver

band switch driver

automatic search, automatic store or manual search

automatic search, automatic store or manual search

see Table 7 for the bit values

Note

1. The output pins 32 and 33 can drive currents up to 5 mA; bits P0.19 and P1.18 control the output voltage of the
control pins P0 (pin 32) and P1 (pin 33):

a) Bit P0.19 LOW sets P0 (pin 32) to LOW.
b) Bit P0.19 HIGH sets P0 (pin 32) to HIGH.
c) Bit P1.18 LOW sets P1 (pin 33) to LOW.
d) Bit P1.18 HIGH sets P1 (pin 33) to HIGH.

2000 Feb 02 9

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

Table 5 Truth table for bits B0.21 and B1.20

B0.21 B1.20 BAND SELECT

00FM

(1)

01MW
10LW
11SW

Note

1. When FM is selected, the control output FM-ON/OFF
(pin 42) is pulled to ground to switch-on the external
FM front-end. Pin 42 is an open-collector pin with a
series resistor R = 500 Ω.

Table 6 Truth table for bits S1.16 and S0.17

SIGNAL RECEPTION

S1.16 S0.17

FM IF

INPUT

(µV)

FM RF

INPUT

(µV)

AM RF

INPUT

(µV)

0 0 >50 >5 >28
0 1 >100 >10 >40
1 0 >300 >30 >63
1 1 >1500 >150 >1000

Table 7 Values for bits F.14 to F.0

BIT BIT VALUEFMVALUE

(1)

(kHz)

F.14 2
F.13 2
F.12 2
F.11 2
F.10 2

F.9 2
F.8 2
F.7 2
F.6 2
F.5 2
F.4 2
F.3 2
F.2 2
F.1 2
F.0 2

14
13
12
11
10

9
8
7
6
5
4
3
2
1
0

− 16384

102400 8192

51200 4096
25600 2048
12800 1024

6400 512
3200 256
1600 128

800 64
400 32
200 16
100 8

50 4
25 2

12.5 1

Notes

1. FM value of the affected oscillators:
a) FM VALUE = FMRF + FMIF (for TEA5757HL).
b) FM VALUE = FMRF − FMIF (for TEA5759HL).

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

AM

VALUE

(kHz)

(2)

2000 Feb 02 10

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

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.4).

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

handbook, full pagewidth

WRITE-ENABLE

BUS-CLOCK

DATA

data shiftdata available after search ready

MSB is LOW

WRITING DATA
While WRITE-ENABLE is HIGH the microcontroller can

transmit data to the TEA5757HL; TEA5759HL (hard mute
is active). Ata rising edge of theBUS-CLOCK, the register
shifts and accepts one bit into LSB. At clock LOW the
microcontroller writes data (see Fig.5).

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

data read

data available

MBE817

ndbook, full pagewidth

WRITE-ENABLE

BUS-CLOCK

DATA

Fig.4 Read data.

MBE818

data changedata shift

Fig.5 Write data.

2000 Feb 02 11

Philips Semiconductors Product specification

Self Tuned Radio (STR) TEA5757HL; TEA5759HL

BUS TIMING

handbook, full pagewidth

WRITE-ENABLE

V

BUS-CLOCK

DATA

t

HIGHtLOW

IH

V

IL

t

da

MBE819

Fig.6 Bus timing.

Table 8 Digital inputs

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

Digital inputs

V

IH

V

IL

HIGH-level input voltage 1.4 − V
LOW-level input voltage − 0.6 V

Digital outputs (open-collector)

I

OL

V

OL

LOW-level output current − 1000 µA
LOW-level output voltage IOL= 600 µA − 0.6 V

Timing

f

clk

t

HIGH

t

LOW

t

da

clock input − 300 kHz
clock HIGH time 1.67 −µs
clock LOW time 1.67 −µs
shift register available after ‘search ready’ − 14 µs

2000 Feb 02 12