Philips Components
Desktop video & FM radio module
system M, N
Preliminary specification
FM1236
Video and audio characteristics (see Fig.2)
PARAMETER
TEST SIGNAL
CVBS characteristics:
video amplitude signal at pin 23
DC level sync pulse at pin 23
Video amplitude drop with respect to modulation
1 MHz at Tamb = 45 °C:
at 2 MHz
at 3 MHz
at 3.58 MHz
Sound carrier rejection
Residual 47.25 MHz signal in video channel:
level of 1.5 MHz
Residual 91.5 MHz signal in video channel
Second IF sound output level at level of 4.5 MHz
Test on 2T pulse at Tamb = 45 °C:
2T pulse/bar response
2T pulse response
CVBS S/N (unweighted)
Gain limited sensitivity at 1 dB reduction
of video output
Maximum usable single input signal
Audio characteristics:
AF output level measured via LP 200 kHz filter,
RMS detector, 75 µs de-emphasis
THD (Total Harmonic Distortion) measured
via LP 200 kHz filter, RMS detector,
75 µs de-emphasis
S/N measured via CCIR filter, peak
CCIR detector, 75 µs de-emphasis
AM suppression ratio
Aerial input level for S/N = 41 dB
A1 (peak-to-peak value)
A1
A1
A1
A1
A1 (1 MHz) + B1
A1 + B3
A1
A1 (black) + B1
A1
A1
A1 + B1
A1
A1
A1 + B2
A1 + B2
A1 (full field colour bar)
+ B1
A1 (black) + B2
A1 (black) + B2
TEST
POINT
MIN.
TYP.
MAX.
UNIT
BU4 0.75 0.95 1.15 V
BU4 −
0.35 −
V
BU4 −1.5 −
BU4 −2.5 −
BU4 −4.0 −
BU4 40 −
BU4 −
−
BU4 −
−
BU5 84 −
+1.0 dB
+1.5 dB
+2.0 dB
−
dB
68 dBµV
80 dBµV
−
dBµV
BU4 −2.5 −
BU4 − −
BU4 41 −
BU4 −
−
BU4 90 −
+2.5 %
+3.0 %
−
dB
30 dBµV
−
dBµV
BU6 0.21 0.31 0.41 V
BU6 − − 0.5 %
BU6 38 −
BU6 40 −
BU6 − −
−
dB
−
dB
45 dBµV
Digital AFC status
ADC word at I2C-bus during read operation
DIGITAL
READ-OUT
00
01
02
03
04
FREQUENCY
(kHz)
−125
−62.5
0
+62.5
+125
1997 Feb 03
12