U2514B [TEMIC]
AM/FM Receiver for Digital Tuning with FM-Stereo Decoder; 对于数字调谐AM / FM接收器，调频立体声解码器
| 型号： | U2514B |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | AM/FM Receiver for Digital Tuning with FM-Stereo Decoder |
| 文件： | 总15页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U2514B
AM/FM Receiver for Digital Tuning with FM-Stereo Decoder
Description
The U2514B is an integrated bipolar radio suitable for generation is implemented for FM and AM mode. This
digital tuning systems. It contains a FM front end with circuit is designed for use in small radios, power packs
pre-amplifier and FM-stereo decoder as well as a and multimedia applications
complete AM receiver and demodulator. Stop-signal
Features
FM wideband AGC
High cut
LO-buffer for digital tuning
Mute function
Integrated stop signal generation with true
AM/ FM discriminators
Pilot canceller
Supply voltage range 3 to 12 V
Package: SSO28
Adjustable stop signal sensitivity
Automatic stereo-mono-blend
Block Diagram
FMOSCE
AFSM
11
FMOSCB
FMRF
FMDET
15
MPXOUT
25
MPXIN
24
6
5
3
18
19
28
2
Matrix
decoder
+ HCC
FMIN
OUTR
OUTL
FM IF +
demodulator
FM front end
FMAGC
21
20
23
LPF
8
4
OSCOUT
GNDRF
AM FM stop
signal detect
Pilot PLL
CERES
CTRLB
27
16
VS
1
AM IF +
demodulator
Control
unit
VRef
AM front end
AMIN
GND
7
10
12
FMIFIN
13
17
9
22
26
AMFM
14
VREF
METER
AMOSC
CTRLA
AMSADJ
IFOUT
AMIFIN
12305
Figure 1.
TELEFUNKEN Semiconductors
1 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Pin Description
Pin
1
Symbol
AMIN
Function
AM antenna input
1
FMIN
28
AMIN
2
3
4
5
6
7
8
FMAGC FM-AGC time constant
FMRF FM RF tank
GNDRF Ground RF
FMOSCE FM oscillator emitter
FMOSCB FM oscillator basis
AMOSC AM oscillator
OSCOUT Buffered AM/FM oscillator
output
FMAGC
FMRF
2
3
4
5
6
7
8
9
VS
27
26
AMFM
MPXOUT
MPXIN
25
24
GNDRF
FMOSCE
FMOSCB
AMOSC
9
AMSADJ Current-input for AM stop signal
adjust
IFOUT AM/FM IF output
23
22
21
CTRLB
CTRLA
LPF
10
11
12
13
14
15
16
17
18
19
20
21
22
AFSM
AF smoothing voltage
FMIFIN FM IF amplifier input
AMIFIN AM IF amplifier input
OSCOUT
AMSADJ
IFOUT
VREF
FMDET FM discriminator output
GND Ground
METER Fieldstrength voltage output
Reference voltage
20
19
CERES
OUTL
10
11
12
OUTR
OUTL
AF output right
AF output left
18
17
16
15
AFSM
OUTR
CERES Resonator 456 kHz
LPF
Low pass filter for Pilot-PLL
FMIFIN
METER
GND
CTRLA Control input for mute, search
mode and search sensitivity
CTRLB Control input for forced mono,
control output for stop function
and stereo information
MPXIN Stereo decoder MPX input
MPXOUT AM/FM MPX output
AMFM AM/FM switch and pilot
canceller time constant
AMIFIN 13
14
23
VREF
FMDET
10547
24
25
26
Figure 2. Pinning
27
28
VS
FMIN
Supply voltage
FM antenna input
Ordering and Package Information
Extended Type Number
U2514B-AFN
Package
SSO28
SSO28
Remarks
U2514B-AFNG3
Taping according to ICE-286-3
2 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Pin Description
FMIN, FMAGC, FMRF
FMOSCE, FMOSCB
FMOSCB
3
FMRF
6
1.2 k
FMOSCE
VREF
MIXER
FM
ON
5
FMAGC
2
GNDRF
12415
T
T
2
1
Figure 4.
I
The FM local oscillator consists of a transistor in
grounded collector configuration. The negative
resistance at the base of the transistor is generated by an
external capacitor connected between emitter FMOSCE
(Pin 5) and GNDRF (Pin 4) An other external capacitor
is connected between base FMOSCB (Pin 6) and emitter
FMOSCE (Pin 5) which increases the resistance at the
emitter and leads to a higher oscillator swing. The
AGC
1.5 k
FMIN
28
FM
ON
GNDRF
12414
negative resistance at FMOSCB is approximately 250
.
Therefore, the resonant LO tank resistance of
approximately 5 k (depends on Q-factor of the coil) is
transformed to this magnitude via a capacitor.
Figure 3.
OSCOUT
8
OSCOUT
The FM pre-amplifier input FMIN (Pin 28) consists of a
transistor grounded base circuit (T ) which provides
2
excellent noise performance and large signal behavior. It
is recommended to connect a source impedance of 100
in order to achieve optimal performance. The dc current
through the amplifying transitor is reduced by the internal
AGC. This means in the case of large input signals, the
input ac current is bypassed via the wideband AGC
FM
AM
12416
Figure 5.
transistor T . A capacitor is connected between FMAGC
1
(Pin 2) and GNDRF (Pin 4). It shortens the transistor base A resistor is connected between OSCOUT (Pin 8) and
to GNDRF and it also serves for smoothing of the AGC VREF (Pin 14). It determines the amplitude of oscillator
voltage. A tuned RF circuit is connected between FMRF voltage which is fed to the PLL circuit. The TEMIC PLL
(Pin 3) and VS (Pin 27). The amplified RF signal is fed familiy U428xBM is recommended because it offers high
internally to the mixer input.
signal to noise ratio and low current consumption.
TELEFUNKEN Semiconductors
3 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
AMIN
AMSADJ
VREF
12418
9
AMSADJ
AMIN
1
GND
IAGC
Figure 8.
GNDRF
12417
Figure 6.
The ceramic resonator of the stereo decoder PLL circuit
is used as a stop signal detector for AM signals. For this
purpose, the parallel resonance frequency of the
resonator, which is unloaded about 456 kHz, is reduced
by an internal load capacitor down to 455 kHz. Therefore,
the AM IF must be 455 kHz. The internal loading
capacitor is defined by the current through AMSADJ
(Pin 9) to GND. An external resistor is connected
between AMSADJ (Pin 9) and GND. It allows the
alignment of the stop signal center frequency. The width
of the stop window is typicaly 800 Hz. If AM search-
mode is not activated, the pin is internally pulled to
ground.
The AM antenna coil is connected between AMIN (Pin 1)
and VREF (Pin 14). In order to ensure that the AGC
operates correctly, a coil impedance of approximately 25
k
is necessary.
AMOSC
7
AMOSC
VREF
IFOUT
10
IFOUT
6 k
AM
ON
FM
AM
12419
GNDRF
12420
Figure 7.
Figure 9.
The AM oscillator has to be loaded by an external tank The IF output (IFOUT Pin 10) of both the FM and the AM
referred to VREF (Pin 14). If reduction of the oscillator mixer has to be loaded into external IF-tank circuits
voltage is necessary, this may be achieved by a parallel refered to VREF (Pin 14). Q-factor of IF coils must not be
resistor.
lower than 50.
4 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
AMIFIN
FMDET
VREF
VREF
3.3 k
15
13
AMIFIN
FMDET
12421
150 A
12422
Figure 10.
Figure 12.
The discriminator allows the connection of a ceramic
resonator or LC tank. A minimization of THD and
adjustment of center frequency versus temperature can
only be achieved by using a LC tank. This performs a
temperature independent stop signal.
The input impedance of the AM IF amplifier is 3.3 k
according to the required impedance of most ceramic
filters. The input refers to VREF (Pin 14).
AFSM
FMIFIN
25
MPXOUT
100 k
11
AFSM
40 A
12
FMIFIN
12423
12424
GND
Figure 13.
Figure 11.
A capacitor is connected between AFSM (Pin 11) and
GND for smoothing of the FM-AF. This is necessary to
generate a modulation independent stop signal. (Because
the deviation of the FM signal (75 kHz) can be greater
than the stop signal window (25 kHz)). In the
The input impedance of the FM IF amplifier is 330
according to the required impedance of most FM ceramic AM-search-mode, the external capacitor smoothes the
filters. The input referes to GND (Pin 16).
demodulated AM-IF-signal.
TELEFUNKEN Semiconductors
5 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
METER
CTRLB
VS
12425
VREF
30 k
23
CTRLB
1.2 V
FM
AM
12447
GND
METER
17
Figure 16.
The signal at the output CTRLB (Pin 23) shows stereo or
mono reception. The stereo reception is indicated if the
voltage is higher than 1.2 V, otherwise it is mono.
Furthermore there is the possibility to force the receiver
circuit to mono by applying an external control voltage
<0.8 V at CTRLB. If the search mode is selected, the low
active stop signal appears at CTRLB. If the output
CTRLB is connected directly to the I/O-port of the micro-
controller, the high level of CTRLB has to be adapted by
connecting a resistor between CTRLB and GND.
Figure 14.
This pin is driven by a current corresponding to the level
of the FM or AM-IF-signal. The required external load
consists of a resistor (100 to 150 k ) in parallel with an
external capacitor (e.g., 10 F necessary to achieve a
good THD in AM mode and to supress AF influence in
FM mode). The voltage at this pin controls the high cut
and mono/ stereo blend function in the case of reception
mode. These functions can be affected by the designer by
choosing different values of the load resistor.
VREF
A internal voltage regulator generates a stable reference
voltage of 2.4 V which is needed for all function blocks
of the IC. An external capacitor has to be connected to
GND in order to achieve stability and noise suppression.
CTRLA
AMFM
22
CTRLA
26
GND
12448
AMFM
Figure 15.
12454
The reception mode, search mode, as well as mute
function and search sensitivity can be selected by
Figure 17.
applying a control voltage at CTRLA (Pin 22). If the By applying a low voltage (<1.1 V) at AMFM (Pin 26),
control voltage is higher than 0.8 V, the receiver circuit the receiver circuit is switched to AM mode. If Pin
is in the reception mode, otherwise it is in search mode. AMFM is open, the FM mode is selected. This switching
When reducing the control voltage between 1.3 and 0.8 V, function can easily be performed by a microcontroller
the AF level output at OUTR, OUTL (Pin 18, 19) is with “open drain” I/O-ports. A capacitor has to be
reduced (mute function). In the search mode (0.7 to 0 V), connected between AMFM and GND for FM mode
the voltage size determines the degree of the search operation. It serves for smoothing the control voltage of
sensitivity.
the pilot canceller.
6 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
CERES
MPXIN
10 k
24
VREF
MPXIN
20
60 k
12452
CERES
50 k
Figure 20.
The MPX signal is applied to MPXIN (Pin 24). It is fed
to the stereo decoder. The input resistance into Pin 24 is
approximately 10 k . It is recommended to align the
channel separation by an RC network between MPXIN
and MPXOUT (Pin 25) due to the tolerances in group
delay of the IF filter.
GND
12449
MPXOUT
Figure 18.
VREF
A ceramic resonator of 456 kHz parallel resonance
frequency (at 30 pF chip internal load capacitance) is
connected between CRES (Pin 20) and GND (necessary
for the pilot regeneration). It should be mounted very
close to Pin 20 in order to avoid spurios radiation. In the
AM (V26 < 1.1 V) search (V22 < 0.8 V) mode, the
resonator is used for stop signal generation. The parallel
resonance frequency is then reduced down to 455 kHz by
adjusting the current into Pin 9 AMSADJ.
25
MPXOUT
GND
12451
Figure 21.
LPF
In order to drive both the compensation network to
MPXIN (Pin 24) and an optional RDS decoder, the
MPXOUT (Pin 25) has a low output impedance. The dc
level is 1.2 V in FM mode (depending on the
discriminator coil alignment) and 0.7 to 1.5 V in AM
mode (depending on the signal level).
VREF
25 k
OUTR/OUTL
21
VREF
LPF
18,19
12450
OUTL
OUTR
12453
Figure 19.
Figure 22.
The open collector output of OUTR/OUTL (Pin 18/19)
A PLL circuit is used for the pilot regeneration of the requires an external resistor of about 4.7 k to ground.
stereo decoder. Therefore, a loopfilter consisting of an RC The de-emphasis may be achieved by an additional
network is connected between LPF (Pin 21) and GND.
parallel capacitor.
TELEFUNKEN Semiconductors
7 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Search Mode
Functional Description
FM
The search-mode is selected by applying a control voltage
less than 0.7 V at pin CTRLA.
The antenna signal is fed via a tuned RF-circuit to the
integrated pre-stage which consists of a transistor
grounded base circuit. To protect the prestage against
overload, an automatic gain control (AGC) is included on
the chip. Additional there is the possibility to extend the
AGC control range by use of an external pin diode. For
economic applications a hybrid-band pass filter can be
used instead of a tuned RF-circuit.
50
40
30
20
10
0
A tuned RF circuit on the collector is necessary for
amplifying and filtering of the FM signal which is fed
internally to the mixer. It consists of a double balanced
Gilbert Cell.
The LO signal is generated by an integrated oscillator.
The buffered LO signal is used to drive a PLL. The
IF-signal (10.7 MHz) is coupled out at the mixers output
and fed via a ceramic filter to the demodulator. The
demodulated AF signal is available at MPXOUT.
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
( V )
12591
V
CTRLA
AM
Figure 24.
The antenna signal is fed directly to the mixer. In order to
ensure the level control which is necessary in the case of
large signals, the generator resistance has to be higher
than 25 k . The LO signal is generated by an integrated
oscillator. The buffered LO signal is used to drive the
PLL. If the AM-search mode is required, the IF must be
455 kHz. The IF output signal is fed via a ceramic filter
to the demodulator. The demodulated AF signal is
available at MPXOUT.
The search sensitivity can be chosen by varying of the
control voltage in the range of 0 to 0.7 V. If the control
voltage is 0 V, the highest sensitivity is achieved.
Reception Mode
In the reception-mode there is a possibility for muting by
varying the control voltage in the range of 1.3 to 0.8 V. If
the control voltage is 0.8 V, the highest mute depth is
achieved.
CTRLA
By applying a control voltage at pin CTRLA the mode of
the receiver can be selected.
10
0
Mode
–10
–20
–30
–40
–50
Reception
Mute
Search
0
0.4
0.8
1.2
1.6
2.0
V
CTRLA
12690
V
( V )
CTRLA
1.3 V
V
Ref
0.8 V
Figure 23.
Figure 25.
8 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
CTRLB
The output CTRLB indicates whether the receiver is If a control voltage less than 0.8 V is applied at CTRLB,
working in mono or stereo mode.
the receiver is forced to mono.
Mode
V
CTRLB
V
S
Stereo
Mono
t
STOP
Figure 27.
V
CTRLB
In the search mode (V
< 0.7 V), the internally
CTRLA
V
1.2 V
S
generated stop signal is available at CTRLB as low active
signal.
Figure 26.
Absolute Maximum Values
Reference point Pin 16 and 4, unless otherwise specified
Parameters
Supply voltage
Symbol
Value
Unit
V
V
S
Power dissipation
External reference current to GND
Junction temperature
P
I
Load
750
3
125
mW
mA
°C
T
j
Storage temperature
Ambient temperature
Electrostatic handling
T
25 to 125
30 to 85
2000
°C
°C
V
stg
T
amb
±V
ESD
Thermal Resistance
Parameters
Junction ambient when soldered to PCB
Symbol
R
thJA
Value
tbd.
Unit
K/W
TELEFUNKEN Semiconductors
9 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Electrical Characteristics
V = 9 V, T
= 25°C; reference point Pins 4 or 16, unless otherwise specified
S
amb
Parameters
DC supply
Supply voltage range
Supply current
Reference voltage
CTRLA
Test Conditions / Pins
Symbol
Min.
3.0
Typ.
Max.
12.0
2.5
Unit
Pin 27
Pin 27
Pin 14
V
S
V
mA
V
I
8
2.4
S
V
Ref
2.3
Input voltage
Search mode
Reception mode
Mute function
Pin 22
V
CTRLA
0
0.8
0.8
0.7
V
V
V
V
Ref
1.3
CTRLB
Output voltage
Mono
Stereo
Stop signal
High
Low
Reception mode
V
V
CTRLB
V
CTRLA
> 0.8 V Pin 23
0
1.2
1.2
V
V
V
S
Search mode
< 0.8 V
CTRLB
V
CTRLA
1.5
0
V
S
V
V
kHz
kHz
0.6
0.8
1.1
Stop window (FM)
Stop window (AM)
f
f
20
1
f
= 455 kHz adjusted
center
at AMSADJ
Input voltage
Forced mono
AMFM
Input voltage
AM
FM
V
CTRLB
0
0
V
V
Pin 26
Pin 8
V
AMFM
open
OSCOUT
Output voltage
V
OSCOUT
AM
FM
120
150
mVrms
mVrms
f
= 110 MHz, unloaded
LO
DC-current (FM)
I
0.7
mA
OSCOUT
METER
Starting point meter (FM)
Slope of meter (FM)
Usable meter range (FM)
DC-output voltage (AM)
Pin 17
Pin 17
Pin 17
v
5
0.04
48
V
V/dB
dB
start
R
17
= 150 k
v
slope
See AM test circuit, Pin 17
V
METER
V
RF
V
RF
V
RF
= 0 dB V
= 40 dB V
= 100 dB V
0.05
0.7
1.8
V
V
V
10 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Parameters
MPXOUT
Output voltage (AM)
Test Conditions / Pins
See AM test circuit
Symbol
Min.
Typ.
Max.
Unit
f
=1 MHz, m = 0.3,f
= 1 kHz, R = 25 k , V
= 1.7 V, Pin 25
RF
mod
gen
CTRLA
V
RF
V
RF
V
RF
= 20 dB V
= 40 dB V
= 100 dB V
V
35
54
66
mV
mV
mV
MPXOUT
rms
rms
rms
Total distortion
V
RF
= 100 dB V
d
0.7
%
Signal plus noise-to-noise
V
RF
V
RF
= 40 dB V
= 100 dB V
(S+N)/N
27
47
dB
dB
Sensitivity (AM)
Sensitivity (FM)
(S+N)/N = 26 dB
f = 98 MHz,
0
38
4
dB V
V
deviation = ±75 kHz,
without de-emphasis
(S+N)/N = 26 dB
MPXIN
Input resistance
Input voltage
Pin 24
R
MPXIN
V
MPXIN
10
k
mV
900
pp
OUTL, OUTR
AF output voltage
f = ±75 kHz,
= 1 kHz,
V
OUT
110
mV
rms
f
mod
V
FMIN
= 1 mV,
f
= 97 MHz
FMIN
Pin 18/19
Output current
I
15
40
26
28
A
out
M
Muting attenuation
Channel separation
Pilot signal suppression
dB
dB
dB
19kHz
CERES
PLL oscillator frequency
f = ±75 kHz,
= 1 kHz,
f
456
kHz
CERES
f
mod
Pilot f = ±6.7 kHz
= 1 mV,
V
FMIN
f
= 97 MHz
FMIN
Pin 20
FMRF
DC-current
Voltage gain preamplifier
Pin 3
I
g
1
16
mA
dB
FMRF
See FM test circuit
20 log (v /v )
FMRF
FMRF
0
AGC threshold
IFOUT
3 dB compression at Pin 3
v
5
mV
0AGC
DC-current
Conversion gain
FMIFIN
Pin 10
I
0.4
20
mA
dB
IFOUT
20 log (v
/v
)
g
c
IFOUT FMRF
Input resistance
Pin 12
r
330
FMIFIN
TELEFUNKEN Semiconductors
11 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
OSCOUT
VREF
METER
OUTR
OUTL
GND
CTRLA
CTRLB
MPXOUT
AM/FM
VS
GND
ANT
VTUNE FM
VTUNE AM
GND
Figure 28. Application circuit
12 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
OSCOUT
VREF
METER
OUTR
OUTL
GND
CTRLA
CTRLB
MPXOUT
AM/FM
VS
GND
ANT
VTUNE FM
VTUNE AM
GND
Figure 29. Application circuit (upgraded)
TELEFUNKEN Semiconductors
13 (15)
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Dimensions in mm
Package: SSO28
9.25
8.75
7.5
7.3
12.7
12.9
2.35
0.25
0.30
0.80
0.25
0.10
10.50
10.20
10.4
technical drawings
according to DIN
specifications
1
14 (15)
TELEFUNKEN Semiconductors
Rev. A2, 04-Nov-96
Preliminary Information
U2514B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic 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.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division 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.
TEMIC 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 TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC 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.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
TELEFUNKEN Semiconductors
15 (15)
Rev. A2, 04-Nov-96
Preliminary Information
相关型号：
©2020 ICPDF网 联系我们和版权申明