TUNERS
DATA SHEET
FM1246
Desktop video & FM radio module
system CCIR I
Preliminary specification
File under Tuners, DC03
1997 May 14
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
FEATURES
• System I and FM radio broadcast
• True 5 V device (low power dissipation)
• Full TV frequency range from channel A (45.75 MHz) to
channel 69 (855.25 MHz)
• FM radio band coverage from 87.50 to 108.00 MHz
In the FM radio mode, the level detector and AFT functions
are provide for the auto-search routines. The level detector
and AFT status can be read from the A/D bits in the
status-byte. The mute function is also provided to
suppress the audio output signal, if required.
• PLL controlled tuning
• Programmable PLL step size (31.25, 50 or 62.5 kHz)
• True-synchronous vision IF demodulator (PLL)
• Ultra-linear FM PLL demodulator for FM radio broadcast
The tuner AGC for both TV and FM radio operation, is
generated with a novel AGC detector which measures the
IF signal level directly at the tuner IF output pins. As
opposed to the conventional AGC detector, this new circuit
allows a higher take-over level and offers superior
immunity against tuner overload.
• Demodulated video output, AF sound output, second
sound IF output
• I2C-bus control of tuning, address selection, AFC status
information
• Complies with European regulations on radiation, signal
handling and immunity “CENELEC 55020, 55013’’
The demodulation of the TV sound and FM radio IF
(10.70 MHz) is done with a PLL demodulation circuit
contained in the IF IC. In the FM radio mode, the
multiplexed AF signal is then channelled to a stereo
decoder IC which extracts the left/right analog signals.
The multiplexed audio signal is also available at pin 25 to
support RDS implementations. The 2nd IF TV sound output
is provided to connect external (analog 2 carrier or digital)
stereo processing.
• Small horizontally mounted metal housing.
DESCRIPTION
The FM1246 front-end is designed to receive both TV and
FM stereo signals in the PC Multimedia environment. The
units are available with separate 75 Ω inputs for TV and
FM broadcast reception. The input connectors available
are either standard phono or IEC type (female for TV, male
for FM radio). The tuning, bandswitching and antenna
selection are made through the I2C-bus.
ORDERING INFORMATION
The front-end covers the TV bands from 45.75 MHz to
855.25 MHz. The FM band covers the standard
87.50 MHz to 108.00 MHz. An RDS decoder can be
connected to the AF-MPX output. The FM1246 meets the
input immunity and radiation requirements of CENELEC.
TYPE
The FM1246 consists of a TV tuner, an FM radio tuner and
an IF section, all on a single PCB. The front-end is
assembled in a metal housing made of a rectangular
tin-plated steel frame, with front and rear covers, which
have soldered contacts to the frame. The two phono or
IEC antenna connectors (female for TV, male for FM
radio) are mounted on one side of the frame for the TV/FM
signal inputs. All other connections are made via pins at
the bottom.
CATALOGUE
NUMBERS
FM1246/HM/PH
standard phono
3139 147 13901
FM1246/HM/I
IEC connector
3139 147 13911
MARKING
The following items of information are printed on a sticker
that is on the top cover of the tuner:
• Type number
• Code number
• Origin letter of factory
• Change code
• Year and week code.
The TV IF section uses an intercarrier SAW filter, followed
by a true-synchronous vision IF demodulator (PLL) IC. The
analog AFC voltage is fed to the 5-level A/D converter in
the PLL tuning IC, so that the AFC status can be read via
the I2C-bus.
1997 May 14
DESCRIPTION
2
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
INTERMEDIATE FREQUENCIES
SYSTEM
Picture carrier
Colour
Sound
NICAM
FM
CHANNEL COVERAGE
FREQUENCY
(MHz)
FREQUENCY
(MHz)
BAND
38.90
34.47
32.90
32.348
10.70
FM radio band
Low band
Mid band
High band
87.50 to 108.00
45.75 to 170.00
170.00 to 450.00
450.00 to 855.25
PINNING
SYMBOL
PIN
DESCRIPTION
VT
11
tuning voltage (monitor)
VS(tuner)
12
supply voltage tuner section +5 V
SCL
13
I2C-bus serial clock
SDA
14
I2C-bus serial data
AS
15
I2C-bus address select
AF O/P right
20
FM radio right channel
AF O/P left
21
FM radio left channel
2nd IF O/P
22
second IF TV sound output
CVBS
23
Composite Video Baseband Signal (CVBS) output
VS(IF)
24
supply voltage IF section +5 V
AF O/P
25
AF sound output
−
1997 May 14
TH1, TH2, TH3 and TH4
mounting tags (ground)
3
1997 May 14
4
FM
antenna
TV
antenna
CCA505
LOW BAND
MID BAND
HIGH BAND
DC-DC
VT
handbook, full pagewidth
12
13
14 15
AFT
IF
FM-IF
10.7 MHz
FILTER
SAW
AGC
DETECTOR
AF-R AF-L
21
2nd IF
sound
output
22
FM
DEMODULATOR
VIF PLL
DEMODULATOR
STEREO
DECODER
20
VIF
FILTER
10.7 MHz
FILTER
24
25
CVBS +5 V AF
VS(IF) (TV)
23
DISCRIMINATOR
10.7 MHz
TRAP
VCO
2nd IF
Desktop video & FM radio module
system CCIR I
Fig.1 Electrical block diagram.
VT
+5 V SCL SDA AS
monitor VS( tuner)
11
PLL
LOW
OSC.
MID
OSC.
HIGH
OSC.
MIXER - OSCILLATOR IC
Philips Components
Preliminary specification
FM1246
BLOCK DIAGRAM
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
LIMITING VALUES
Limiting values under operational conditions
The tuner can be guaranteed to function properly under the following conditions.
SYMBOL
PARAMETER
VS
supply voltage
VS(ripple)
peak-to-peak ripple voltage susceptibility
(at 5 V ±5%); note 1
PIN
12
20 Hz to 100 kHz
>100 kHz to 500 kHz
IS(tuner)
supply current
VSCL
SCL bus input voltage
VSDA
SDA bus input voltage
ISDA
SDA bus current (open collector)
VAS
address select voltage; note 2
VAFright(FM)
FM right channel DC voltage
ZAFright(FM)
FM right channel load impedance parallel connected:
13
14
15
resistive value
20
capacitive value
VAFleft(FM)
FM left channel DC voltage
ZAFleft(FM)
FM left channel load impedance:
21
resistive value
capacitive value
ZIF
2nd
ZCVBS
Composite Video Baseband Signal load impedance
tL
CVBS load time constant
VS(IF)
IF supply voltage
IS(IF)
IF supply current
ZAF
AF sound output load impedance parallel connected:
IF sound output load impedance
22
23
24
resistive value
25
capacitive value
MIN.
TYP.
MAX.
UNIT
4.75
5.00
5.25
V
−
−
5
mV
−
−
10
mV
−
−
120
mA
−0.3
−
+5.25
V
−0.3
−
+5.25
V
−1
−
+5
mA
−
−
+5.25
V
−
1.0
−
V
−
50
−
kΩ
−
9
−
pF
−
1.0
−
V
−
50
−
kΩ
−
9
−
pF
0.5
−
−
kΩ
−
75
−
Ω
−
−
100
ns
4.75
5.0
5.25
V
−
−
150
mA
5.0
−
−
kΩ
−
−
4
nF
Notes
1. Sinusoidal ripple voltage superimposed on the 5 V supply voltage in the frequency range of 20 Hz to 500 kHz.
Criteria for TV interference >57 dB.
2. For detailed information about the address decoding, refer to Chapter “Application information”.
1997 May 14
5
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Environmental conditions
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Non-operational conditions
−25
−
+85
°C
−
−
100
%
−
−
245
m/s2
50 g
−
−
490
m/s2
10 to 55 Hz
−
0.35
−
mm
Tamb
ambient temperature
RH
relative humidity
gB
bump acceleration
25 g
gS
shock acceleration
vibration amplitude
Operational conditions
Tamb
ambient temperature
−10
−
+60
°C
RH
relative humidity
−
−
95
%
OVERALL PERFORMANCE
Conditional data
Unless otherwise specified, all electrical values for Chapter “Overall performance” apply at the following conditions.
SYMBOL
PARAMETER
VALUE
UNIT
Tamb
ambient temperature
25 ±5
°C
RH
relative humidity
60 ±15
%
VS
supply voltage (tuner and IF section)
5 ±0.125
V
ZCVBS
video output load impedance (DC)
75
Ω
ZIF
2nd IF sound output load impedance (DC)
0.5
kΩ
ZAF
AF sound output load impedance
100
kΩ
tpr
pre-heating time (+5 V at pin 24)
10
minutes
ZS(AE)
aerial source impedance (asymmetrical)
75
Ω
1997 May 14
6
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
TUNER CHARACTERISTICS
For detailed information about the PLL programming, refer to Chapter “Application information”.
The desktop video tuner is guaranteed to function properly within the specified operational conditions, but a certain
deterioration of performance parameters may occur at the limits of the operational conditions.
Required data for test equipment to be used
EQUIPMENT
PARAMETER
DC voltmeter
input impedance
Oscilloscope
input impedance:
VALUE
UNIT
>1
MΩ
resistance
>1
MΩ
capacitance
<15
pF
Spectrum analyzer
input impedance
50
Ω
FET probe
input impedance:
resistance
1
MΩ
capacitance
3.5
pF
output impedance
50
Ω
voltage gain
0
dB
input impedance
>100
kΩ
AC millivoltmeter
1997 May 14
7
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
handbook, full pagewidth
FM1246
aerial
connector
TP2
9
TP3
10 11 12 13 14 15
20 21 22 23 24 25
IF
PROBE
OUT
IF
output
5V
VT
VS
BU2
220
nF
22
Ω
220
nF
SCL
+
39
kΩ
SDA
1/
2
TDA1308
240
kΩ
6
−
4
7
+
39
kΩ
5
+
2
−
TEST JIG
3
kΩ
47
kΩ
33
µF
10
nF
1
µF
47
kΩ
8
240
kΩ
1
+
47
µF
22
Ω
220
kΩ
+
3
+
47
µF
1
nF
1/
2
TDA1308
47
µF
22
Ω
220
kΩ
BU7
BU8
BU5
CCA650
P
BU4
BU2
video
out
BU6
+5 V
S1
5
kΩ
10
nF
15 kHz
LOW-PASS
FILTER
(2)
(1)
SA
DA
(1) BU4 loaded with 75 Ω.
(2) 50 µs de-emphasis.
SA = Spectrum Analyzer.
P = FET probe.
DA = Distortion Analyzer.
VAC = dual channel AC voltmeter (Zi = 600 Ω).
The minimum load impedance required at the CVBS output (pin 23) is 75 Ω (both AC and DC).
Fig.2 Typical test set up.
1997 May 14
8
DA
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Definitions of test signals (see Fig.2)
FREQ.
(MHz)
TEST SIGNAL
MODULATION
AMPLITUDE
VIDEO
A0: unmodulated vision
carrier
480.25
60 dBµV
A1: CCIR I standard signal
with video modulation
480.25
60 dBµV
(top sync)
B1: unmodulated sound
carrier I system
486.25
−7 dB w.r.t. A1
B2: FM modulated sound
carrier I system
486.25
−7 dB w.r.t. A1
B3: unmodulated sound
carrier I system
478.25
−15 dB w.r.t. A1
AUDIO
100% (rest carrier 10%)
2T pulse and bar
1 kHz; modulation frequency
deviation ±27 kHz;
50 µs pre-emphasis
C1: FM modulated sound
carrier
87.5
60 dBµV
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
C2: FM modulated sound
carrier
98.0
60 dBµV
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
C3: FM modulated sound
carrier
108.0
60 dBµV
1 kHz; modulation frequency
deviation ±75 kHz;
10% pilot carrier (L = R)
C4: FM modulated sound
carrier
98.0
60 dBµV
1 kHz; modulation frequency
deviation ±22.5 kHz
C5: unmodulated sound
carrier
98.0
60 to 100 dBµV
Aerial input characteristics
SYMBOL
VSWR
PARAMETER
reflection coefficient
CONDITIONS
FM (centre of channel)
surge protection voltage
Vant
antenna connection disturbance
voltage
1997 May 14
MAX.
UNIT
referred to 75 Ω impedance
(worst case on or between picture
and sound carrier at maximum gain):
all channels in TV mode
VPSM
MIN.
<1.75 GHz
9
−
5
−
4
5
−
kV
−
46
dBµV
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
General characteristics
SYMBOL
fb
∆fb
αi
αIF
ZIF
mx
Vosc
tli
αvs
VESD
PARAMETER
frequency range:
FM band
low band
mid band
high band
margin:
for FM band
for low band
for mid/high band
image rejection (nominal gain to
10 dB gain reduction):
low band
mid band
mid band
high band (channel 14 to 69)
IF rejection (picture)
1⁄ IF susceptibility:
2
low, mid band
high band
cross modulation:
in-channel
in-band
low band (n ±2)
mid band (n ±3)
high band (n ±5)
out of band
breakthrough susceptibility:
channel A to 69
oscillator voltage at all pins
oscillators lock-in time
the video signal-to-sound
interference ratio with the tuner
exposed to sound signals in the
audio frequency range
100 Hz to 10 kHz and sound
pressure levels up to 105 dB
(20 µPa)
audio S/N ratio
electrostatic discharge (ESD)
on all pins
1997 May 14
CONDITIONS
MIN.
TYP.
MAX.
UNIT
87.50
45.75
175.25
455.25
−
−
−
−
108.00
168.25
447.25
855.25
MHz
MHz
MHz
MHz
3
1.5
3
−
−
−
−
−
−
MHz
MHz
MHz
68
66
60
50
60
−
−
−
−
−
−
−
−
−
−
dB
dB
dB
dB
dB
75
60
−
−
−
−
dBµV
dBµV
65
−
−
dBµV
78
78
84
−
−
−
−
100
−
−
−
−
dBµV
dBµV
dBµV
dBµV
60
−
charge pump set logic HIGH −
40
−
−
−
−
−
70
150
−
dBµV
dBµV
ms
dB
40
2
−
−
−
−
dB
kV
<300 MHz
>300 MHz
note 1
10
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
SYMBOL
PARAMETER
FM1246
CONDITIONS
MIN.
TYP.
MAX.
UNIT
FM radio characteristics
α26
α50
αi(FM)
THD
limiting sensitivity for (S+N)/N
S/N ratio:
mono at f = 22.5 kHz
mono at f = 75 kHz
stereo
FM image rejection
effective selectivity S300
frequency response:
lower −3 dB point
upper −3 dB point
AM suppression
FM AF output level at
terminal 20/21 (RMS value):
mono
stereo
stereo separation
total harmonic distortion:
stereo at 1 kHz
during overmodulation at
f = ±100 kHz
test signal C1
test signal C3
test signal C1
test signal C3
test signal C1
test signal C1 + C2
test signal C3; −3 dB points
test signal C1
test signal C1
test signal C3
test signal C3; 1 kHz
test signal C3
−
−
7
30
30
40
dBµV
dBµV
55
65
55
53
50
58
68
63
65
−
−
−
−
−
−
dB
dB
dB
dB
dB
−
14
38
20
18
−
40
−
−
Hz
kHz
dB
40
120
28
57
175
35
74
230
−
mV
mV
dB
−
−
0.8
1.5
1.5
3
%
%
Note
1. All the pins of the desktop video tuner are protected against electrostatic discharge (ESD) up to 2 kV. The product is
classified in category B (‘‘MIL-STD-883C”).
1997 May 14
11
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Video and audio characteristics (see Fig.2)
PARAMETER
TEST SIGNAL
TEST
POINT
MIN. TYP. MAX.
UNIT
CVBS characteristics:
video amplitude signal at pin 23
A1 (peak-to-peak value)
BU4
0.75
0.95
1.15
V
DC level sync pulse at pin 23
A1
BU4
−
0.7
−
V
A1
BU4
−1.5
−
+1.5
dB
Video amplitude drop with respect to modulation
1 MHz at Tamb = 45 °C:
at 2 MHz
at 3 MHz
A1
BU4
−2.5
−
+1.5
dB
at 4 MHz
A1
BU4
−4.0
−
+2.0
dB
at 4.43 MHz
A1
BU4
−4.0
−
+2.0
dB
Sound carrier rejection
A1 (1 MHz) + B1
BU4
40
−
−
dB
Residual 40.40 MHz signal in video channel:
level of 1.5 MHz
A1 + B3
BU4
−
−
68
dBµV
Residual 77.8 MHz signal in video channel
A1
BU4
−
−
80
dBµV
Second IF sound output level at level of 6.0 MHz
A1 (black) + B1
BU5
84
−
−
dBµV
2T pulse/bar response
A1
BU4
−2.8
−
+2.8
%
2T pulse response
Test on 2T pulse at Tamb = 45 °C:
A1
BU4
−
−
+3.5
%
CVBS S/N (unweighted)
A1 + B1
BU4
41
−
−
dB
Gain limited sensitivity at 1 dB reduction
of video output
A1
BU4
−
−
30
dBµV
Maximum usable single input signal
A1
BU4
90
−
−
dBµV
AF output level measured via LP 200 kHz filter,
RMS detector, 50 µs de-emphasis
A1 + B2
BU6
250
350
450
mV
THD (Total Harmonic Distortion) measured
via LP 200 kHz filter, RMS detector,
50 µs de-emphasis
A1 + B2
BU6
−
−
0.5
%
S/N measured via CCIR filter, peak
CCIR detector, 50 µs de-emphasis
A1 (full field colour bar)
+ B1
BU6
38
−
−
dB
AM suppression ratio
A1 (black) + B2
BU6
40
−
−
dB
Aerial input level for S/N = 41 dB
A1 (black) + B2
BU6
−
−
45
dBµV
Audio characteristics:
Digital AFC status
ADC word at I2C-bus during read operation
DIGITAL
READ-OUT
FREQUENCY
(kHz)
−125
00
01
−62.5
02
0
03
+62.5
+125
04
1997 May 14
12
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
APPLICATION INFORMATION
A detailed description of the I2C-bus specification, with applications, is given in brochure ‘‘The I2C-bus and how to
use it’’. This brochure may be ordered using the code number 9398 393 40011.
WRITE mode
BITS
BYTE
7
MSB
6
5
4
3
2
1
0
LSB
A(1)
1
0
n7
1
P7
1
n14
n6
CP
P6
0
n13
n5
T2
P5
0
n12
n4
T1
P4
0
n11
n3
T0
P3
MA1
n10
n2
RSA
P2
MA0
n9
n1
RSB
P1
0
n8
n0
OS
P0
A
A
A
A
A
Address byte
Program divider byte 1
Program divider byte 2
Control information byte 1
Control information byte 2
Note
1. A = Acknowledge.
ADDRESS SELECTION
VS = +5 V (PLL supply voltage).
MA1
MA0
ADDRESS
0
0
1
1
0
1
0
1
C0
C2
C4
C6
VOLTAGE AT PIN 15 (see note 1)
0.0VS to 0.1VS
0.2VS to 0.3VS
0.4VS to 0.6VS
0.9VS to 1.0VS
Note
1. If the AS pin is left floating, the internal bias will automatically set the address to C2.
PROGRAMMABLE DIVIDER SETTINGS (BYTES 1 AND 2)
Divider ratio:
N = 16 × {fRF(pc) + fIF(pc)}, where (pc) is picture carrier and fRF and fIF are expressed in MHz.
fosc = N⁄16 (MHz).
N = (8192 × n13) + (4096 × n12) + (2048 × n11) + (1024 × n10) + (512 × n9) + (256 × n8) + (128 × n7) + (64 × n6) +
(32 × n5) + (16 × n4) + (8 × n3) + (4 × n2) + (2 × n1) + n0
For FM radio, fIF(fm) = 10.70 MHz
N = (fRF + fIF(fm))/step size = (fRF + fIF(fm))/50 kHz = 20 × (fRF + fIF(fm))
1997 May 14
13
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
CONTROL BYTE
Charge pump settings:
CP = 1, for fast tuning
CP = 0, for moderate speed tuning with slightly better residual oscillator FM.
It is recommended to set CP = 1 at all times in the TV mode. In the FM radio mode, set CP = 1 only during the search
tuning. Once the wanted channel is obtained, set CP = 0 to get the best signal-to-noise ratio.
Test mode settings:
T2 = T1 = 0; T0 = 1, for normal operation.
PLL disabling:
OS = 0, for normal operation
OS = 1, for switching the charge pump to the high impedance state. IDC output voltage is LOW.
Ratio select bits
RSA
RSB
X
0
1
0
1
1
STEP SIZE
50 kHz (for FM band)
31.25 kHz (for slow picture search)
62.5 kHz (for normal picture search)
PORTS BYTE
FUNCTION
BIT
P7
P6
P5
P4
1
1
1
0
0
0
0
0
1
1
0
1
0
0
1
1
P3
P2
P1
P0
TV/FM bandswitching
FM band
Low band
Mid band
High band
1
0
0
0
TV mode
Power down mode; see note 1
System I negative mode
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
1
0
0
1
0
1
0
0
0
FM radio mode
AFC; see note 2
RIF; see note 3
Mono
Mute
Notes
1. If the TV function is not required, the tuner can be switched to power-down mode. In this mode the tuner reduces the
current consumption by up to 100 mA.
2. By this setting the FM radio AFC status can be read from the A/D bits in the status byte.
3. By this setting the RF input level can be read from the A/D bits in the status byte.
1997 May 14
14
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
TELEGRAM EXAMPLES (WRITE MODE)
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Pb - Ack - Stop.
Start - Adb - Ack - Cb - Ack - Pb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Where:
Start = start condition
Adb = address byte
Ack = acknowledge
Db1 = divider byte 1
Db2 = divider byte 2
Cb = control byte
Pb = ports byte
Stop = stop condition.
READ mode
The in-lock can be read by setting the R/W bit to 1.
BITS
BYTE
Address byte
Status byte
7
MSB
6
5
4
3
2
1
0
LSB
A(5)
1
1
0
0
0
MA1
MA0
1
A
POR(1)
FL(2)
I2(3)
I1(3)
I0(3)
A2(4)
A1(4)
A0(4)
A
Notes
1. POR = Power On Reset. POR is internally set to 1 in case VS drops below 3 V. The POR bit is reset when an end of
data is detected by the PLL IC.
2. FL = In-lock flag; FL = 1: loop is phase-locked. The loop must be phase-locked during at least 8 periods of the internal
reference frequency (either 7.8125 kHz, 3.90625 kHz or 6.25 kHz) before the FL flag is internally set to 1.
3. I2, I1 and I0 = digital information for I/O ports P2, P1 and P0 respectively.
4. A2, A1 and A0 = built-in 5-level A/D converter on the internal I/O port P6 (see Table “Digital AFC status”).
5. A = Acknowledge.
TELEGRAM EXAMPLES (READ MODE)
Start - Adb - Ack - STB - Ack - STB - - Stop (no Ack from processor = End-of-data).
Start - Adb - Ack - STB - - Stop (no Ack from processor = End-of-data).
Where:
STB = Status byte.
1997 May 14
15
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Video buffer
A video buffer is built into the video module to enable the
unit to drive a 75 Ω load directly.
handbook, halfpage
VCC
I2C-bus load
R1
R3
100 Ω
R2
R4
15
C1
56 pF
C2
22 pF 14
100 Ω
R5
100 Ω
PLL IC
The FM1246 contains a series resistor (R = 100 Ω) in the
SCL and SDA lines. Both lines also have a capacitive load
of typical 22 pF (see Fig.3).
AS
13
SDA
SCL
C3
22 pF
CCA507
Fig.3 I2C-bus load.
CCA651
70
handbook, full pagewidth
video S/N
(dB)
50
30
10
20
40
60
80
100
RF input level (dBµV)
Fig.4 Typical video signal-to-noise ratio versus RF input level.
1997 May 14
16
120
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
MECHANICAL DATA
handbook, full pagewidth
8.1
±0.3
(1)
(1)
∅8.35
STANDARD PHONO CONNECTOR
14.4
±0.2
78.4
2.5
2
∅11
0.5
5.1
(2)
7.9
∅9.5
4
14.7
59.2
IEC CONNECTOR TYPE
13.5 max
TH 1
TH2
34.7
34.7
29.2
TH4
TH3
11
12 13 14 15
20 21 22
0.64 × 0.64
23 24 25
4.445
89.2
Dimensions in mm.
(1) Standard phono socket female 75 Ω.
(2) Alternative IEC connectors (female for TV/male for FM radio).
Fig.5 Mechanical outline FM-versions.
1997 May 14
2.6
10.85
17
CCA649
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Aerial connections
Mass
Standard-phono socket female 75 Ω or IEC (female for TV,
male for FM radio).
Approximately 50 g.
Robustness of pins
Solderability
The pins will not be damaged when tested in accordance
with ‘‘IEC 68-2-21’’ :
The solderability of pins and mounting tags when tested
initially and after 16 hours steam ageing in accordance
with ‘‘IEC 68-2-20’’, test Ta, method 1 (solder bath
235 ±5 °C for 2 ±5 s), results in a wetted area of 95%.
No de-wetting will occur when soldered at
260 ±5 ° C for 5 ±0.5 s.
• Test Ua1, tensile of 20 N in axial direction
• Test Ua2, thrust of 4 N in axial direction
• Test Ua2, thrust of 2 N in axial direction.
Punching pattern of chassis PCB
Resistance to soldering heat
Field rejects are often related to broken tag joints.
Therefore, the following punching pattern is recommended
(see Fig.6).
The product will not be damaged when tested in
accordance with ‘‘IEC 68-2-20’’, test Tb, method 1A
(solder bath 260 ±5 °C for 5 ±1 s).
78.4
handbook, full pagewidth
0.9 +0.1
0
4.6
3.5
2
34.7
unit
contour
∅ 2.1
∅ 1.1
2.6
CCA509
14.7
4.445
59.2
Dimensions in mm.
Fig.6 Punching pattern seen from solder side.
1997 May 14
18
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
TV CHANNEL FREQUENCIES (MHz)
South Africa
Ireland
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
A
45.75
51.75
4
175.25
181.25
B
53.75
59.75
5
183.25
189.25
C
61.75
67.75
6
191.25
197.25
D
175.25
181.25
7
199.25
205.25
E
183.25
189.25
8
207.25
213.25
F
191.25
197.25
9
215.25
221.25
G
199.25
205.25
10
223.25
229.25
H
207.25
213.25
11
231.25
237.25
J
215.25
221.25
13
247.43
253.43
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
1
43.25
49.25
2
52.25
58.25
Angola
3
60.25
66.25
4
175.25
181.25
5
183.25
189.25
6
191.25
197.25
7
199.25
205.25
8
207.25
213.25
9
215.25
221.25
10
223.25
229.25
1997 May 14
19
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
DEFINITIONS
Data sheet status
Objective specification
This data sheet contains target or goal specifications for product development.
Preliminary specification
This data sheet contains preliminary data; supplementary data may be published later.
Product specification
This data sheet contains final product specifications.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
PURCHASE OF PHILIPS I2C COMPONENTS
Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
1997 May 14
20
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
1997 May 14
21
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
1997 May 14
22
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
1997 May 14
23
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COD11
© Philips Electronics N.V. 1997
All rights are reserved. Reproduction in whole or in part is prohibited without the
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