Datasheet U2510B-M Datasheet (ATMEL)

All-Band AM/FM Receiver and Audio Amplifier

Description

The U2510B is an integrated bipolar one-chip AM/FM
radio circuit. It contains an FM front end with
preamplifier, FM IF and demodulator, a complete AM

Features

 Superior FM strong signal behavior by using RF AGC

receiver, an AF amplifier and a mode switch for AM, FM
and tape. This circuit is designed for clock radios and
portable radio-cassette recorders.

 DC mode control: AM, FM and tape

U2510B

 Soft mute and HCC for decreasing interstation noise

in FM mode

 Excellent AFC performance (level controlled, both

polarities available)

 Level indicator (LED drive) for AM and FM

Block Diagram

FM osc.

tank

87 6

AFC

FM

front end

FM

AM

front end

RFAGC

AM/FM

and

15

IF BPE

14 16

AFC

control

AM IF

amp. and

detect.

IF

AGC

AGC

21 13 20 19 1

FM ant.

FM RF

BPE

AGC

AM

ant.

AM osc.

tank

12

11

10

5

V

Ref

FM RF

tank

9

AGC

Voltage stab.
mode control

 Wide supply-voltage range and low quiescent current
 High AF output power: 1 W
 Electronic volume control
 Electronic AF bandwidth control (treble and high cut)
 Output stage for headphone and speaker drive

(Replaceable)

V

S

AM

IF

FM IF

amp.

Level
indic.

226

FM

discr.

22 18

Power

amp.

AF preamp.

Volume

Mute
HCC

28

27

3

25
23

24

4

S

AM

FM

2

Tape

V

S

AFC mode

Figure 1. Block diagram

LED

V

S

Treble Vol

13912

Rev. A3, 23-Feb-01 1 (15)

U2510B

Order Information

Extended Type Number Package Remarks

U2510B-M SDIP28

U2510B-M__T SDIP28 VS < 6 V supply voltage

Pin Description

Mute

FM-discr

Vol ctrl in

AMOsc

FM-AFC

FMOsc

V

FMtank

AMtank

FM-AGC

FMin

FE-GND

AM/FM

IFout

CF

Ref

1

2

3

4

5

6

7

8

9

10

11

12

13

14

14812

Figure 2. Pinning

Pin Symbol Function

1 Mute Mute voltage output, time constant (C23),

2 FM-discr FM discriminator filter connection, ceramic

3 CF Audio negative feedback input. Blocking

4 Vol ctrl in Input for volume control voltage

mute depth and threshold adjustable by load
resistance (R3)

resonator or equivalent LC-circuit

capacitor (C8) determines the audio amplifiers
low-end cut-off frequency

28

27

26

25

24

23

22

21

20

19

18

17

16

15

AF-GND

AFout

V

S

Ripple in

AFin

AM/FM detect

V

AGC/AFC

AFC switch

IF-GND

LED drive

V

Treble in

FM-IFin

AM-IFin

Mode ctrl
switch

Pin Symbol Function

5 AMOsc AM oscillator tank circuit input, recommended

6 FM–AFC AFC diode connection, coupling capacitor

7 FMOsc FM oscillator tank circuit input, recommended

8 V
9 FMtank FM RF tank circuit connection, recommended

10 AMtank AM RF tank circuit connection, recommended

11 FM-AGC FM AGC voltage output, time constant (C20).

12 FMin FM RF input (common-base preamplifier

13 FE-GND FM front-end ground
14 AM/FM

15 Mode ctrl

16 AM-IFin AM IF input, input impedance = 3.1 k
17 FM-IFin FM IF input, input impedance = 330 
18 V
19 LED drive Level indicator output

20 IF-GND IF ground
21 AFC switch AFC function control input:

22 V

23 AM/FM

24 AFin Audio amplifier input, input resistance

25 Ripple in Ripple filter connection. Load capacitance

26 V
27 AFout Audio amplifier output
28 AF-GND Ground of the audio power stage

IFout

switch

Treble in

AGC/AFC

detect

load impedance approximately 2.5 k

(C19) determines the AFC characteristic
(holding range and slope)

load impedance approximately 3 k
Regulated voltage output (2.4 V)

Ref

load impedance approximately 3 k

load impedance approximately 20 k

Loading this pin by a resistor (to GND) will
increase the FM AGC threshold, grounding
this pin will switch off the FM AGC function

transistor), recommended (RF) source
impedance approximately 100 

AM/FM IF output
(collector output of the IF preamplifier)

Mode control input:

Pin | Function
open | F M
Ground | AM
VS (R4 = 10 k) | Tape

Treble control voltage input

(open-collector output, LED drive)

Pin | Function
open | AFC off
Ground | f
V

S

AGC/AFC voltage, time constant adjust (C10),
input impedance approximately 42 k

AM/FM detector output, the load capacitor
(C11) in conjunction with the detector output
resistance (7.5 k) determines the (FM)
deemphasis as well as the (modulation)
frequency response of the AM detector

approximately 100 k coupling capacitor
(C9) determines the low frequency response

(C12) determines the frequency response of the
supply-voltage ripple rejection

Supply voltage input

S

| f

OSC
OSC

> f

in

< f

in

Rev. A3, 23-Feb-012 (15)

Terminal Voltages

Test circuit: Vin = 0

Pin Symbol

1 Mute voltage (R3 = 0) V
2 FM discriminator V
3 Negative feedback V
4 Volume control input (S4 = A) V
5 AM oscillator V
6 FM AFC V
7 FM oscillator V
8 V

Ref

9 FM RF tank V
10 AM input V
11 FM AGC V
12 FM input V
13 Front end ground V
14 AM/FM IF output V
15 Mode control switch V
16 AM IF input V
17 FM IF input V
18 Treble control input (S5 = A) V
19 LED V
20 IF ground V
21 AFC switch (S3 = off) V
22 AGC (AM)/AFC (FM) V
23 Detector output V
24 AF input V
25 Ripple filter V
26 Supply voltage V
27 AF output V
28 AF ground V

U2510B

Voltage/V

VS = 3 V VS = 6 V

AM FM TAPE AM FM TAPE

1
2
3
4
5
6
7

V

8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

– 1.6 – – 1.6 –
– 1.0 – – 1.0 –

1.2 1.2 1.2 2.6 2.6 2.6

2.4 2.4 2.4 2.4 2.4 2.4

2.4 – – 2.4 – –
– 1.9 – – 1.9 –
– 2.4 – – 2.4 –

2.4 2.4 2.4 2.4 2.4 2.4
– 2.4 2.4 – 2.4 –

2.4 – – – 2.4 –
– 0 – – 0 –

1.4 – – 1.4 –

– – – – – –

2.9 2.7 – 5.9 5.7 –
0 – 2.9 0 – 5.7
0 – – 0 – –
– 0.7 – – 0.7 –

2.4 2.4 2.4 2.4 2.4 2.4

0 0 0 0 0 0

1.2 1.2 1.2 1.2 1.2 1.2

1.5 1.2 – 1.5 1.2 –

1.5 1.2 – 1.5 1.2 –

1.5 1.5 1.5 1.5 1.5 1.5

2.7 2.7 2.7 5.3 5.3 5.3

3.0 3.0 3.0 6.0 6.0 6.0

1.2 1.2 1.2 2.6 2.6 2.6
0 0 0 0 0 0

Rev. A3, 23-Feb-01 3 (15)

U2510B

Absolute Maximum Ratings

Parameters Symbol Value Unit
Supply voltage V
Power dissipation P
Ambient temperature range T

Electrical Characteristics

S

tot

amb

13 V

900 mW

–20 to +75 °C

VS = 6 V, T

= 25°C, test circuit (figure 16), unless otherwise specified

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply voltage range V
Oscillator stop voltage V

S
S

2.5 9 * V

2.2 V

Operating temperature range T –20 +75 °C
Supply quiescent current Vi1 = Vi2 = V4 = 0;

AM (S2 = AM)
FM (S2 = FM)
TAPE (S2 = Tape)

Regulated voltage Pin 8 V

I
I
I

Ref

S
S
S

4.0

6.5

2.2

2.4 V

Audio amplifier Vi3 (Pin 24), test point: Vo (Pin 27) f = 1 kHz
AF measuring range: 30 Hz to 20 kHz, S2 = Tape, S4 = A, S5 = A

Input resistance Pin 24 R
Closed loop voltage gain GV

= 20 log (Vo/Vi3)

af1

Vi3 = 10 mV GV
Output voltage Vi3 = 100 mV, S4 = B V
High–end cut-off frequency fc (–3 dB)

S5 = B
Supply-voltage rejection ratio SVRR = 20 log (V

V

= 200 mV,

hum

f

= 200 Hz, S4 = B SVRR 32 dB

hum

hum/Vo

)

Noise voltage S4 = B, Vi3 = 0 V

j

af1
o

f

c

f

c

n

100 k

40 dB

0.7 3 mV
13

0.8

kHz
kHz

300 1000 V

AF output power THD = 10 %, RL = 8 

VS = 4.5 V
VS = 6.0 V
VS = 9.0 V

P

o

P

o

P

o

400

225
420

1000

mW
mW
mW

Distortion Po = 50 mW, RL = 8  d 0.6 %
FM section, Vi2 = 60 dBV, fi2 = 98 MHz, fm = 1 kHz, dev. =  22.5 kHz, f

= 10.7 MHz,

iIF

AF measuring range: 300 Hz to 20 kHz, S2 = FM, S1 = A, S6 = B, test point: VD (Pin 23)
FM front-end voltage gain GVFM = 20 log (V

S1 = B, Vi2 = 40 dbV GV
Recovered audio voltage Pin 23 VD
Detector output resistance Pin 23 R

iIF

/ Vi2)

Do

FM

30 dB

af

85 mV

7.5 k

Detector output distortion dev. =  75 kHz

Vi2 = 60 dBV

Vi2 = 105 dBV

THD
THD

0.5

0.8

* U2510B-M__T: max. 6 V

mA
mA
mA

%
%

Rev. A3, 23-Feb-014 (15)

Electrical Characteristics (continued)

U2510B

VS = 6 V, T

= 25°C, test circuit (figure 16), unless otherwise specified

amb

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
AM rejection ratio m = 30% AM
RF sensitivity (S+N)/N = 26 dB

(S+N)/N = 46 dB

Limiting threshold (-3 dB) V

RR

V

i2

V

i2
i2

Mute voltage Test point: Mute

Vi2 = 0
Vi2 = 60 dBV

V
V

mute
mute

Mute depth Referred to V0 at Vi2 = 0

S6 = A
S6 = C

AFC holding range f

> fin, S3 = A, S6 = A

OSC

V

 10 dBV

i2

Vi2 = 20 dBV

Vi2 = 80 dBV
LED current I
Oscillator voltage eZ

= 2.5 k Pin 7 V

load

AM section Vi1 = 60 dBV, fi1 = 1.6 MHz, fm = 1 kHz, m = 30%, f

MD
MD

FHR
FHR
FHR

LED

OSC

= 455 kHz,

iIF

AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD)
AM front end voltage gain GVAM = 20 log (V

iIF/Vi1

)

GV

AM

Vi1 = 20 dBV, S1 = A
Recovered audio voltage V
Detector output resistance Pin 23 R
Detector output distortion Vi1 = 60 dBV

Vi1 = 105 dBV
RF sensitivity (S+N)/N= 10 dB

(S+N)/N= 26 dB

(S+N)/N= 46 dB
AGC figure of merit referred

to V

D af

Vi1 = 105 dBV, voltage

drop (V

) = –10 dB FOM 100 dB

D af

IF input resistance Pin 16 Z
LED current I
Oscillator voltage Pin 5 V

D af1

Do

THD
THD

V

i1

V

i1

V

i1

i

LED

OSC

25 dB

9

22

3 dBV

1.8

0.4

26
20

no AFC

 180
 220

5.5 mA

180 mV

25 dB

70 mV

7.5 k
1

3
0

16
35

3.1 k

5.5 mA

160 mV

dBV
dBV

V
V

dB
dB

kHz
kHz

%
%

dBV
dBV
dBV

Rev. A3, 23-Feb-01 5 (15)

U2510B

S

I ( mA )

9510396

U

V ( dB )

95 10397

10

T

=25°C

amb

8

6

AM

4

2

0

246810

VS ( V )

Figure 3. Quiescent current

50

without

40

30

with treble control

20

Vi=5mV
VS=6V

10

RL=8
T

=25°C

amb

0

0.01 0.1 1 10
f ( kHz )

treble control

Tape

FM

12

100

10000

1000

o

P ( mW )

100

RL=4

8
16
32

10

010

9510399

VS ( V )

Figure 6. AF section: Max. output power

40

32

o

P ( mW )

24

16

246810

95 10400

VS ( V )

f=1kHz
d=10%
T

amb

V

hum

VS=6V
RL=8
T

=25°C

amb

=25°C

50

f=200Hz

f=100Hz

=200mV

12

d ( % )

95 10398

Figure 4. AF section

10

f=1kHz
T

=25°C

amb

8

6

VS=3V
RL=32

VS=6V
RL=8

4

2

0

1 10 100 1000

Po ( mW )

Figure 5. AF section: Distortion

VS=9V
RL=8

10000

Figure 7. AF section: Supply-voltage rejection ratio

o

V ( dBV )

95 10403

2.0

1.6
R3=∞

1.2

100k

0.8

68k

0.4

0

–20 0 20 40 60

Vi ( dBV )

VS=6V
T

=25°C

amb

80 100

Figure 8. FM section: Mute voltage

Rev. A3, 23-Feb-016 (15)

120

U2510B

0

S+N(m=80%)

–20

S+N(m=30%)

–40

D

V ( dBV )

–60

N

VS=6V
fi1=1.6MHz
fAF=1kHz
T

=25°C

amb

–80

d(m=80%)

–100

d(m=30%)

–20 0 20 40 60

95 10404

Vi ( dBV )

Figure 9. AM section: Demodulator output level

0

VS=6V
Vi3=10mV

–20

–40

O

V ( dBV )

–60

fAF=1MHz
fAF=10kHz
T

=25°C

amb

Treble Voltage V

8

Treble Voltage = 0

6

5

4

AM

FM

I

LED

3

LED

I ( mA )

2

1

VS=6V
T

=25°C

amb

0

120

10080

95 10407

020406080

Vi ( dBV )

100

120

Figure 11. AM/FM level indicator current

2.0

1.2

0.8

AGC

V ( V )

VS=6V

0.4

fi1=1.6MHz
T

=25°C

amb

–80

0 0.5 1 1.5 2

95 10406

V4 ( V )

Figure 10. Volume control range characteristics

2.5

0

95 10408

20 0 20 40 60

Vi ( dBV )

80 100

Figure 12. AM section: AGC voltage (at Pin 22)

120

Rev. A3, 23-Feb-01 7 (15)

U2510B

D

V ( dBV )

95 10401

68k

100k

95 10402

0

–20

–40

–60

–80

–100

–20 0 20

Figure 13. FM section: Demodulator output level

0

R3=0

–20

∞

–40

o

V ( dBV )

–60

–80

–100

–20 0 20 40 60

S+N(f=75kHz)

S+N(f=22.5kHz)

AM(m=30%)

N

40 60

80

Vi ( dBV )

AM

Vi ( dBV )

N

d

80 100

S+N

120100

120

V

= 6 V

S

f

= 98 MHz

i2

f

= 1 kHz

AF

T

= 25°C

amb

d(f=75kHz)
d(f=22.5kHz)

V

= 6 V

S

R

= 8 

L

P

= 50 mW at

o

V

= 60 dBV

i2

f

= 98 MHz

i2

f

= 1 kHz

AF

f = 22.5 kHz
m

= 30%

AM

T

= 25°C

amb

O

V ( dBV )

–100

95 10405

Figure 14. FM section: Audio output level

0

S+N

–20

–40

d

–60

–80

–20 0 20 40 60

80 100

Vi ( dBV )

Figure 15. AM section: Audio output level

N

P

= 50 mW at

o

V

= 60 dBV

i1

R

= 8 

L

f

= 98 MHz

i1

f

= 1 kHz

AF

m = 80%
T

= 25°C

amb

120

Rev. A3, 23-Feb-018 (15)

Test Circuit

V

i1

(50 Ω)

V

i2

50 Ω

AM IFT

T

R

8

455 kHz

1

CF

(50 Ω)

R

100 Ω

R

75 Ω

1

U2510B

R

5

150Ω

C

24

6

100 nF

C

25

7

10 nF

14

L

A

150 µH

13 12 11 10 9 8 7

43 pF

C

22 nF

C

C

3

2

22 pF

20

C7C

4.7 µF

L

1

L

2

22 nF

C

18 pF

2.2 kΩ

6

U2510B

T

4

2

R

4

C

19

5.6 pF

654321

C

22 pF

C

8

4.7 µF

5

C

100

B

A

S

4

T

4

25

pF

C

18 pF

B

A

S

5

R

3

Ω

150 k

C

23

68 nF

C

B

S

24

6

V

A

mute

15 16 17

CF

Tape

2

FM

AM

2

10.7 MHz

R

1

390 Ω

R

2

10 kΩ

S

BA BA

1

V

iIF

R

3 kΩ

S

9

C

21

10 nF

19 20

18

C

22

10 nF

LEDD

1

100 nF

I

LED

Figure 16. Test circuit

Application

General

The U2510B is a bipolar monolithic IC for use in radio
sets, for example, headphone receivers, radio recorders
and clock radios. The IC contains all AM, FM, AF and
switching function blocks necessary to construct these
kinds of radio receivers using only few components
around the IC. In the design, special efforts were made to
get good performance for all AM bands (short and long
wave).

The implementation of enhanced functions (options)
makes it possible to improve the radio’s performance and
to produce radios with interesting features. In this case
few (external) parts have to be changed or added. By
using all or some of the options offered by the U2510B
different types or classes of radios can be designed to the
customer ’s requirements with the same IC.

A

off

C14C

21

S

3

B

10 µF

23

22

C

9

10 nF

C

10

11

10 nF

V

D

24

C

10 µF

V

i3

25 26

12

470 µF

27

28

C

15

220µF

C

13

R

L

8Ω/
2 W

V

V

S

GND

o

One of the general advantages of using the U2510B is the
fact that all receiver functions (including the options) are
integrated and tested on a system level. Therefore, two
additional cost-savings are achieved by:

1. Shorter development time through less technical
problems and

2. Higher reproductivity and low reject level in the set
production line.
Another advantage, due to the technology of the
U2510B, is the wide operating voltage range, espe­cially the upper limit (13 V). This feature allows the
use of soft power supply for line powered radios
which can also reduce the set’s total cost.

13913

Rev. A3, 23-Feb-01 9 (15)

U2510B

Circuit Example

Figure 17 shows a circuit diagram for low end AM/AF
radios using the U2510B. Figure 18 shows a circuit
diagram of AM/AF radio for higher class designs using all
possible options of the U2510B. The layout of the PC
board, shown in figure 19, is suitable for both the circuit
example shown in figure 17 and the circuit example
shown in figure 18. The associated coil, varicon and filter
specifications are listed in the table: COIL DATA and
SPECIAL COMPONENT PARTS. The circuit diagram
(figure 18), has the following options compared to the
circuit diagram (figure 17) (the additional parts, which
have to be provided, are listed in parentheses):

a) Soft mute and high cut control in FM mode (1 cap.)
b) Electronic treble control in AM, FM and TAPE mode

(1 pot.)
c) On-chip mode control for TAPE application
d) RF AGC in FM mode (1 capacitor)
e) AFC, adjustable to the correct polarity and slope

(1 cap.)
f) Tuning indication using LED as an indicator

(1 LED, 1 cap.)
Option a) reduces the interstation noise by the two

functions: soft mute and HCC. Both are controlled by the
mute voltage (Pin 1). The soft mute reduces the loudness
only, while the HCC reduces the high-end audio cut-off
frequency of the audio preamplifier, when the signal level
falls below a given threshold. This signal level threshold
as well as the mute depth can be reduced by adding a
resistor (R3) or by increasing the FM front–end gain.

Option b) allows the treble control for all operating modes
without the need of an additional capacitor. This concept
leads to a smooth and correct treble control behavior
which is an improvement compared to the controlled RC
network normally used.

Option c) is very useful for application in radio
cassette-recorders, for instance. In TAPE mode, the
AM/FM receiver blocks are completely switched off and
the signal from the tape recorder can be fed to the audio
amplifier ’s input directly. This saves quiescent current
and makes the TAPE switching easy. However, to
minimize switching noise by the mode switch, the
following switch sequence should be chosen: AM, FM,
TAPE.

Option e) improves the tuning behavior substantially. The
special design of the on-chip AFC function means that
common disadvantages such as asymmetrical slope,
(chip-) temperature effects and unlimited holding range
are avoided. As mentioned in the “Pinning Description
Table”, the AFC slope has to be inverted when the local
oscillator (LO) frequency has to be below the receiving
frequency. This can be achieved by connecting Pin 21 to
the potential of Pin 8. In addition to the options described
above, the following proposals are implemented in the
circuit diagram (figure 18), too:

 An FM IFT is applied. This improves the channel

selectivity and minimizes substantially the spurious
responses caused by the FM ceramic filter (CF2). With
the choice of the winding ratio of this IFT, the FM
front end gain can be matched to other values if neces­sary.

 In the FM RF input section, the low cost antenna filter

(L5, C15) is replaced by a special band pass filter
(PFWE8). Such a BPF protects the FM front end
against the out-off-band interference signals (TV
channels, etc.) which could disturb the FM reception.

Design Hints

The value of the power supply blocking capacitor C
should not be below 470 F. In addition, this capacitor
should be placed near Pin 26. This will help to avoid
unacceptable noise generated by noise-radiation from the
audio amplifier via the bar-antenna. In designs, where the
supply voltage goes below 2.5 V, the value of the blocking
capacitor (C7) should be chosen as 47 F or even higher.
To achieve a high rejection of short wave reception in
medium wave operation, the LO amplitude at Pin 5
should not exceed approximately 200 mV. This LO
amplitude depends on the LO transformer’s Q and its
turns ratio. For the LO transformer type described in the
“Coil Data Table”, a resistor R4 (2.2 k for example) in
parallel to the secondary side of the AM LO transformer
T2 is recommended. To minimize feedback effects in the
RF/IF part in FM mode, the capacitor C6 should be placed
as near to Pins 8 and 20 as possible.

As shown in the application circuit diagrams (figures 17
and 18), in FM mode ceramic filter devices are used for
channel selection (CF2) while for FM, demodulation in
LC-discriminator circuit (T4, C24, C25) is used instead of
a ceramic discriminator device.

13

Option d) improves the strong signal behavior by
protecting the FM mixer against overload. This is
provided by the integrated broad-band-width RF AGC. If
necessary, the AGC threshold can be decreased by a
resistor, loading Pin 11 to GND (not shown).

Such an LC discriminator circuit can be easily matched
to the FM IF selectivity block by its alignment. The zero­crossing of the discriminator can be detected at the
demodulator output (Pin 23). The zero-crossing voltage
is equal to half of the regulated voltage at Pin 8.

Rev. A3, 23-Feb-0110 (15)

U2510B

The alignment of the LC-discriminator circuit should be

done with little or no effect on the AFC function. This can

be realized by:

– switching Pin 21 to open-circuit

– connecting Pin 1 to a voltage source of 2 V

– using a low signal level for alignment.

Application Circuits

Antenna

AMFM

C

2

3

22 pF

AM IFT

T

L

C

3

C

16

33 pF

C

C

33 pF

455 kHz

1

CF

1

17

18

33 pF

L

4

13 12 11 10 9 8 7

14

2 pF

In general, ceramic discriminator devices can be used,
too. In this case, the effect of unavoidable spreads in the
frequency characteristics of these case ceramic devices in
conjunction with the IC characteristic has to be consid­ered. For example, mismatches of the characteristics
between selectivity block and FM discriminator will lead
to an increased signal-to-noise ratio at low signal level as
well as to a higher demodulation distortion level or to an
asymmetrical AFC.

T

2

4

4.7 µF

654321

C

5

Volume

6 pF

T

4

C

25 100 pF

C

8

C

18 pF

24

P

50 kΩ

C7C

4.7 µF

C

27 pF

L

L

2

1

6

22 nF

U2510B

1

R

1

390 Ω

S

2

15 16 17

CF

2

AM

FM

10.7 MHz

19 20

18

21

C

4.7 µF

23

22

C

9

10 nF

C

10

11

10 nF

24

C

4.7 µF

25 26

12

470 µF

27

28

C

15

220 µF

100 nF

C

14

Z = 8 Ω

C

13

S

1

V

S

13915

Figure 17. Application circuit (low cost)

Rev. A3, 23-Feb-01 11 (15)

U2510B

Antenna

AMFM

L

3

2 pF

C

C

2

3

22 pF

27 pF

L

L

2

1

T

C

2

4

6 pF

C

Volume

5

P

1

50 kΩ

Treble

P

2

50 kΩ

100 pF

AM IFT

T

AM IFT

T

BPF 1

C

7C6

22 nF

4.7 µF

C

20

22 pF

14

13 12 11 10 9 8 7

455 kHz

1

CF

1

R

4

2.2 kΩ

C

5.6 pF

19

C

8

4.7 µF

18 pF

654321

T

4

C

100 pF

25

C

23

68 nF

)

(R

C

3

24

Mute

Adj.

U2510B

3

CF

2

10.7 MHz

R

15 16 17

S

Tape

FM

AM

2

C

21

10 k

10 nF

19 20

18

C

22

21

10 nF

LEDD

1

2

Ω

C

10 µF

23

22

C

9

22 nF

C

10

11

10 nF

IN Tape

24

C

4.7 µF

25 26

12

470 µF

27

28

C

15

220 µF

100 nF

C

14

C

13

S

1

V

S

13914

Figure 18. Application circuit (upgraded) R2 only if V

Figure 19. PC-board

> 8 V

S

Rev. A3, 23-Feb-0112 (15)

Coil Data and Special Component Part

U2510B

Part Stage L or C

between

T1AM IFT 180 pF

1 to 3

T2AM OSC 270 H

1 to 3

T3FM IFT

(optional)

T4FM discrimi-

nator

100 pF

1 to 3

100 pF

1 to 3

L1FM RF

air coil
4 mm diam.

L2FM OSC

air coil
4 mm diam.

L4FM antenna

air coil
4 mm diam.

Q0 between Wire diameter/mm

0

Terminal No.

Number of turns

90

1 to 3

0.07

1 to 2

111

125

1 to 3

0.06

1 to 3

107

0.09

1 to 2

3

0.09

1 to 3

10

0.62

3.75

0.62

3.75

0.62

4.75

0.07

2 to 3

35

0.06

4 to 6

29

0.09

2 to 3

7

0.07

4 to 6

7

0.09

4 to 6

2

Type

Manufacturer

7MC-7789N
Toko
21K7-H5
Mitsumi

7TRS-8441
Toko
L-5K7-H5
Mitsumi

mat.:
7P A119 AC
Toko

mat.:
7P A119 AC
Toko

L

3

AM bar antenna L: 630 H total turns : 96 tap: 19

BPF1 (optional) PFWE8 (88 to 108 MHz) Soshin Electric Co.

CF

1

CF

2

CF

C

3

1

3

2

4

(optional) CDA10.7MC1 Murata

Variable capacitor HD22124 AM/FM Toko

4 mm

4

6

Coil, bottom view Air coil AM bar antenna

SFU-455B
BFCFL-455

SFE10.7MA5
CFSK 107M1

Figure 20.

Murata
Toko

Murata
Toko

3 mm 80 mm

18 mm

1

Pin 10C

Pin 8

13931

Rev. A3, 23-Feb-01 13 (15)

U2510B

Package Information

Package SDIP28

Dimensions in mm

27.5

27.1

4.8

4.2

10.26

10.06

0.9

3.3

0.53

23.114

1

0.43

1.778

technical drawings
according to DIN
specifications

0.35

0.25

8.7

8.5

12.2

11.0

13044

Rev. A3, 23-Feb-0114 (15)

U2510B

Ozone Depleting Substances Policy Statement

It is the policy of Atmel Germany GmbH to

1. Meet all present and future national and international statutory requirements.

2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.

It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).

The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.

Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.

1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively

2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA

3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.

Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.

We reserve the right to make changes to improve technical design and may do so without further notice.

Parameters can vary in different applications. All operating parameters must be validated for each customer

application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended

or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,

costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death

associated with such unintended or unauthorized use.

Data sheets can also be retrieved from the Internet: http://www.atmel–wm.com

Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany

Telephone: [phone], Fax number: 49 (0)7131 67 2423

Rev. A3, 23-Feb-01 15 (15)