Multistandard multimedia IF-PLL
and FM radio demodulator
Preliminary specification
File under Integrated Circuits, IC02
1997 Nov 19
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
FEATURES
• 5 V supply voltage
• Gain controlled wideband Video IF (VIF) amplifier
(AC-coupled)
• True synchronous demodulation with active carrier
regeneration (very linear demodulation, good
intermodulation figures, reduced harmonics,
excellent pulse response)
• Robustness for over-modulation better than 105% due
to gated phase detector at L/L accent standard and PLL
bandwidth control for negative modulation standards
• VCO (Voltage Controlled Oscillator) frequency can be
switched between L and L accent (alignment external)
picture carrier frequency
• VIF AGC (Automatic Gain Control) detector for gain
control, operating as peak sync detector for B/G and
peak white detector for L; signal controlled reaction time
for L
• Tuner AGC with adjustable TakeOver Point (TOP)
• AFC (Automatic Frequency Control) detector without
extra reference circuit
• AC-coupled limiting amplifier for sound intercarrier
signal
TDA9816M
• Alignment-free FM PLL (Phase-Locked Loop)
demodulator with high linearity; integrated de-emphasis
resistor
• Integrated level detector
• Alignment-free FM radio AFC detector with external
resonator
• RIF (Radio IF) amplifier for 10.7 MHz
• SIF (Sound IF) input for single reference QSS (Quasi
Split Sound) mode (PLL controlled); SIF AGC detector
for gain controlled SIF amplifier; single reference QSS
mixer able to operate in high performance single
reference QSS mode
• AM demodulator without extra reference circuit
• Stabilizer circuit for ripple rejection and to achieve
constant output signals
• ESD (Electrostatic Discharge) protection for all pins.
GENERAL DESCRIPTION
The TDA9816M is an integrated circuit for multistandard
vision IF signal processing, sound AM and FM
demodulation and FM radio demodulation in multimedia
sets.
ORDERING INFORMATION
TYPE NUMBER
NAMEDESCRIPTIONVERSION
TDA9816MSSOP28 plastic shrink small outline package; 28 leads; body width 5.3 mmSOT341-1
−3 dB video bandwidth on pin 18CL< 30 pF; RL> 1.5 kΩ;
78−MHz
AC load
weighted signal-to-noise ratio for
5458−dB
video
intermodulation attenuation at ‘blue’f = 1.1 MHz5258−dB
intermodulation attenuation at ‘blue’f = 3.3 MHz5258−dB
suppression of harmonics in video
3540−dB
signal
minimum sound IF input signal
−3 dB at intercarrier output−3070µV
voltage (RMS value)
audio output signal voltage for FM
(RMS value)
B/G standard;
27 kHz modulation
0.40.50.6V
total harmonic distortion for video27 kHz modulation−0.51.0%
weighted signal-to-noise ratio for
27 kHz modulation; t = 50 µs50 55 −dB
audio
Radio mode
V
i(RIF)(rms)
V
i(FM)(rms)
/log∆Vioutput voltage slope according to
∆V
LD
minimum radio IF input signal
voltage (RMS value)
minimum FM limiter input signal
voltage (RMS value)
d3< 60 dB intermodulation;
note 1
SN+
unweighted26 dB=
-------------N
FM limiter input voltage
V
o(audio)(rms)
audio output signal voltage for radio
22.5 kHz modulation200250300mV
(peak-to-peak value)
THD
S/N
audio
W(audio)
total harmonic distortion for audio22.5 kHz modulation−0.51.0%
weighted signal-to-noise ratio for
audio
22.5 kHz modulation;
15 kHz bandwidth
Note
is the ratio of the intermodulation product at 10.3 MHz to the level of V
1. d
3
1997 Nov 193
−−20mV
−100−µV
−50−mV/dBµV
5964−dB
i(4)(max)(rms)
.
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
BLOCK DIAGRAM
video
1 V (p-p)
TRAP
SOUND
1.1 V (p-p)
18
GND
k, full pagewidth
P
V
level
AFC/RIF
n.c.
19252221752623
20
VOLTAGE
INTERNAL
STABILIZER
TV AFC
DETECTOR
VIDEO
AND AMPLIFIER
DEMODULATOR
oAF
V
10
TDA9816M
10.7 MHz
AFC
RADIO
13
12241514
AF SIGNAL PROCESSING
FM-PLL DEMODULATOR AND
LEVEL DETECTOR
iFM
V
oQSS
V
ceramic
resonator
DEC
C
de-em
C
mute
forced
5.5 MHz
TDA9816M
MHA990
10.7 MHz
PC
2 × f
adjust
L accent
PLL
T
VAGC
C
BL
C
TADJ
VCO
TWD
9
VIF
17
AGC
AGC
TUNER
16
TV/radio
tuner AGC
AND TV AFC
QSS MIXER
FPLL
AND
VIF AMPLIFIER
AGC DETECTOR
2
1
iVIF1ViVIF2ViSIF1ViSIF2
V
VIF
SAW
INTERCARRIER MIXER
SIF AMPLIFIER
27
28
SIF
SAW
AND AM DEMODULATOR
intercarrier
AND
RIF AMPLIFIER
AGC DETECTOR
LOGIC
AND
SIF AMPLIFIER
AGC DETECTOR
4
iRIF
V
mode
10.7 MHz
11
38
6
adjust
soft mute
threshold
LP2
LP1LP0
SAGC
C
Fig.1 Block diagram.
1997 Nov 194
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
PINNING
SYMBOLPINDESCRIPTION
V
iVIF1
V
iVIF2
LP03logic port 0
V
iRIF
C
VAGC
C
SAGC
T
PLL
LP18logic port 1
LADJ9L/L accent switch and adjustment
V
17black level detector
18composite video output voltage
25supply voltage
27SIF differential input signal voltage 1
28SIF differential input signal voltage 2
handbook, halfpage
V
1
iVIF1
V
2
iVIF2
LP0
3
V
4
iRIF
C
C
C
V
VAGC
SAGC
T
PLL
LP1
LADJ
V
oAF
LP2
de-em
C
DEC
oQSS
5
6
7
TDA9816M
8
9
10
11
12
13
MHA989
Fig.2 Pin configuration.
TDA9816M
V
28
iSIF2
V
27
iSIF1
TADJ
26
V
25
P
CERRES
24
GND
23
VCO2
22
VCO1
21
n.c.
20
AFC
19
V
18
o(vid)
C
17
BL
TAGC
16
V
1514
iFM
1997 Nov 195
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
FUNCTIONAL DESCRIPTION
The TDA9816M is comprised of the functional blocks
shown in Fig.1:
• Vision IF amplifier and AGC detector
• Tuner (TV/radio) and VIF AGC
• Frequency Phase Locked Loop (FPLL) detector
• VCO, Travelling Wave Divider (TWD) and TV AFC
• Video demodulator and amplifier
• SIF amplifier and AGC detector
• Single reference QSS mixer
• AM demodulator
• RIF amplifier and AGC detector
• FM-PLL demodulator, level detector and radio AFC
• AF (Audio Frequency) signal processing
• Internal voltage stabilizer
• Logic.
Vision IF amplifier and AGC detector
The vision IF amplifier contains three AC-coupled
differential amplifier stages. Each differential stage
includes a feedback network controlled by emitter
degeneration.
The AGC detector generates the required VIF gain control
voltage for constant video output by charging/discharging
the AGC capacitor. The sync level of the video signal is
therefore detected for negative video modulation, while the
peak white level is detected for positive video modulation.
In order to reduce the reaction time for positive modulation,
where a very large time constant is needed, an additional
level detector is used to increase the discharge current of
the AGC capacitor (fast mode) in the event of a decreasing
VIF amplitude step. The additional level information is
given by the black-level detector voltage.
Tuner (TV/radio) and VIF AGC
For TV operation, the AGC capacitor voltage is converted
to an internal IF control signal and then fed to the tuner
AGC to generate the tuner AGC output current at
pin TAGC (open-collector output). The tuner AGC
takeover point can be adjusted at pin TADJ. This allows
the tuner to be matched to the SAW filter in order to
achieve the optimum IF input level.
For FM radio operation, an AGC detector is provided to
obtain some adjacent channel protection.
TDA9816M
Frequency Phase-Locked Loop detector (FPLL)
The VIF amplifier output signal is fed, via a limiting
amplifier, to a frequency and phase detector. During
acquisition, the frequency detector generates a DC current
proportional to the difference in frequency between the
input signal and the VCO signal. After frequency lock-in,
the phase detector generates a DC current proportional to
the phase difference between the input signal and the
VCO signal. The DC current generated by the frequency or
phase detector is converted to a DC voltage via the loop
filter, which controls the VCO frequency. For positively
modulated signals, the phase detector is gated by
composite sync in order to avoid signal distortion with
overmodulated VIF signals.
VCO, TWD and TV AFC
The VCO operates with a resonance circuit (with L and C
in parallel), at double the Picture Carrier (PC) frequency.
The VCO is controlled by two integrated variable
capacitors. The control voltage required to tune the VCO
from its free-running frequency to double the PC frequency
is generated by the FPLL and fed via the loop filter to the
first variable capacitor. This control voltage is amplified
and converted into a current which represents the AFC
output signal.
The VCO centre frequency can be decreased (required for
L accent standard) by activating an additional internal
capacitor using logic ports LP0 and LP1. A variable
resistor connected to LADJ can be used in conjunction
with the second variable capacitor to set the VCO centre
frequency to the required L accent value. At the centre
frequency, the AFC output current is zero.
The TWD divides the oscillator signal by 2 and generates
two differential output signals with a 90° phase difference
independent of frequency.
Video demodulator and amplifier
Video demodulation is realized by a multiplier designed for
low distortion and wide bandwidth. The vision IF input
signal and the ‘in-phase’ signal of the travelling wave
divider output are multiplied together. The video signal
polarity can be switched in the demodulator stage in
accordance with the relevant TV standard.
The demodulated output signal is fed to the video amplifier
via an integrated low-pass filter used to attenuate the
carrier harmonics. This is an operational amplifier with
internal feedback and wide bandwidth. A low-pass filter is
integrated to attenuate the carrier harmonics for B/G and
L standard.
1997 Nov 196
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
The standard-dependent level shift in this stage delivers
the same sync level for positive and negative modulation.
The video output signal at V
vision IF modulation, in order to achieve 1 V (p-p) at the
sound trap output.
SIF amplifier and AGC
The sound IF amplifier consists of two AC-coupled
differential amplifier stages. Each differential stage is
comprised of a controlled feedback network provided by
emitter degeneration.
The SIF AGC detector is related to the SIF input signal
(average level of AM or FM carrier). It controls the SIF
amplifier to provide a constant SIF signal to the
AM demodulator and single reference QSS mixer.
The AGC reaction time is set to ‘slow’ for nominal video
conditions. But with a decreasing VIF amplitude step the
SIF AGC is set to ‘fast’ mode, controlled by the VIF AGC
detector. In FM mode this reaction time is also set to ‘fast’
mode according to the TV standard.
Single reference QSS mixer
The single reference QSS mixer is realized by a multiplier.
The SIF amplifier output signal is fed to the single
reference QSS mixer and converted to the intercarrier
frequency by the regenerated picture carrier (VCO).
The mixer output signal is fed, via a high-pass filter used
to attenuate the video signal components, to output pin 14.
High performance hi-fi stereo sound processing can be
achieved with this system.
For a simplified application without a sound IF SAW filter,
the single reference QSS mixer can be switched to the
intercarrier mode by connecting pin 27 and/or pin 28 to
ground. In this mode, the sound IF signal passes through
the vision IF SAW filter and the composite IF signal is then
fed to the single reference QSS mixer. Here, the IF signal
is multiplied by the 90° TWD output signal to convert the
sound IF to the intercarrier frequency. By using this
quadrature detection, the low frequency video signals are
removed.
AM demodulator
A multiplier is used for AM demodulation. The modulated
SIF amplifier output signal and the ‘in-phase’ limited
(AM is removed) SIF amplifier output signal are multiplied
together. The demodulated output signal is fed, via an
integrated low-pass filter used to attenuate the carrier
harmonics, to the AF amplifier.
is 1.1 V (p-p) for nominal
o(vid)
TDA9816M
RIF amplifier and AGC
The radio IF amplifier amplifies the 10.7 MHz radio IF
signal. This signal is supplied by the tuner and is fed to the
RIF input (pin 4) via a matching circuit and a ceramic
band-pass filter. This amplifier contains two stages.
The first stage, a conventional 0 dB differential amplifier
designed for optimal dynamic range, is followed by a
switchable differential amplifier stage with a gain of 10 dB.
Either the radio IF or to the TV IF signal can be selected at
the output (pin 14).
The RIF output signal is fed via ceramic band-pass filters
to the FM-PLL demodulator and the radio IF AGC detector.
The AGC threshold is very high and is designed to obtain
some adjacent channel protection. The AGC detector
output is fed to the tuner AGC output stage (pin 16) to
control the tuner.
FM-PLL demodulator level detector and radio AFC
The FM-PLL demodulator consists of a limiter and an FM
phase-locked loop. The 8-stage internally AC-coupled
limiter amplifies and limits the TV FM sound intercarrier or
the radio FM intermediate frequency signal prior to
demodulation. The limiter is designed for high sensitivity
and AM suppression with low DC offset and needs no
external pins for DC coupling.
Furthermore, the AF output signal can be force muted by
connecting a resistor between pin 15 and ground. The soft
mute function can be disabled by connecting a resistor
between pin 15 and the power supply. See the application
circuit in Fig.18.
The FM-PLL consists of an integrated relaxation oscillator,
an integrated loop filter and a phase detector.
The oscillator is locked to the FM intercarrier signal output
from the limiter. As a result of locking, the oscillator
frequency tracks with the modulation of the input signal
and the oscillator control voltage is superimposed on the
AF voltage. The FM-PLL operates as an FM demodulator.
The level detector detects, rectifies and amplifies the
output signals from the first 5 limiter stages. These signals
are then summed and the composite signal passed
through a low-pass filter, followed by a 6 dB output
amplifier. A DC voltage dependent on the limiter input level
is generated for controlling the behaviour of the AF soft
mute. The 6 dB output amplifier can be switched off via the
control logic and the level detector output signal fed to
pin 19. Furthermore, the steepness of the level detector
output signal tracks that of the power supply voltage.
1997 Nov 197
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
radio demodulator
The radio Automatic Frequency Control (AFC) stage is
comprised of a 10.7 MHz phase shifting network, a phase
detector (quadrature demodulator), a differential amplifier
input stage (which receives the limiting amplifier output
signal), and a current mode output stage.
A ceramic resonator is used for phase shifting. This
permits alignment-free operation.
AF signal processing
The AF signal processing stage consists of a pre-amplifier
for the FM-PLL demodulator output signal, an AF source
selector, a soft and forced mute stage with an integrated
time constant, and an AF post-amplifier.
The FM demodulator output signal is pre-amplified by an
operational amplifier (30 dB gain) with internal feedback,
high gain and high common mode rejection. The feedback
circuit, together with external capacitor C
pin 13, keeps the DC level at the pre-amplifier output
constant (2.3 V). An external resistor connected in series
with C
The low-pass filter characteristic (130 kHz bandwidth) of
the amplifier reduces the harmonics of the IF signal at the
sound signal output.
The source selector operational amplifier selects and
amplifies the appropriate AF source signal by means of the
control logic: AM from the AM demodulator in TV L/L
accent mode, FM from the FM demodulator via
de-emphasis (internal resistor, external capacitor C
pin 12) in TV B/G mode or FM direct from the FM
demodulator in radio mode.
provides a gain-reduction capability.
DEC
connected to
DEC
de-em
at
TDA9816M
Soft mute occurs when the internal level detector output
voltage is lower than the mute threshold voltage at pin 11
(provided an external resistor is not connected between
the limiter input, pin 15, and the supply voltage). The mute
stage reduces the AF signal by 25 dB, with an internal time
constant of approximately 7 ms.
If forced mute is active (see Table 2), or a resistor is
connected between pin 15 and ground, the mute stage will
reduce the AF signal level by more than 70 dB, with the
same time constant.
Otherwise, the AF signal level will not be reduced.
The AF post-amplifier, which was designed to include a
rail-to-rail output stage, provides the required AF output
level at pin 10.
Internal voltage stabilizer
The band gap circuit generates a voltage of approximately
1.25 V internally, independent of supply voltage and
temperature. A voltage regulator circuit connected to this
voltage generates a constant 3.6 V which is used as an
internal reference voltage.
Logic
The logic circuit detects the logic levels and threshold
voltages at ports LP0, LP1 and LP2 and controls the
internal functions as described in Table 2.
1997 Nov 198
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
TDA9816M
radio demodulator
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOLPARAMETERCONDITIONSMIN.MAX.UNIT
V
P
V
n
t
sc
V
TAGC
T
stg
T
amb
V
es
Notes
1. I
P
2. Machine model class B (L = 2.5 µH).
supply voltage (pin 25)maximum chip temperature
−5.5V
of 125 °C; note 1
input voltage at pins 1 to 13, 15 to 17,
0V
19 and 23 to 28
short-circuit time−10s
tuner AGC output voltage013.2V
storage temperature−25+150°C
operating ambient temperature−20+70°C
electrostatic handling voltagenote 2−300+300V
= 102 mA; T
=70°C; R
amb
th(j-a)
= 110 K/W.
P
V
THERMAL CHARACTERISTICS
SYMBOLPARAMETERCONDITIONSVALUEUNIT
R
th(j-a)
thermal resistance from junction to ambient in free air110K/W
1997 Nov 199
Philips SemiconductorsPreliminary specification
Multistandard multimedia IF-PLL and FM
TDA9816M
radio demodulator
CHARACTERISTICS
VP=5V; T
peak white level for L); V
residual carrier B/G: 10%; L = 3%; video signal in accordance with
unless otherwise specified.
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX.UNIT
Supply (pin 25)
V
P
I
P
Television mode
ISION IF AMPLIFIER (PINS 1 AND 2)
V
V
i(VIF)(rms)
∆V
o(int)
G
VIF(CR)
B
VIF(−3dB)
R
i(dif)
C
i(dif)
V
I
TRUE SYNCHRONOUS VIDEO DEMODULATOR; note 3
f
VCO(max)
∆f
/∆Toscillator drift as a
osc
V
VCO(rms)
f
cr(PC )
=25°C; see Table 1 for input frequencies; input level V
amb
i(FM)(rms)
= 10 mV; IF input from 50 Ω via broadband transformer 1 : 1; video modulation DSB;