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COMTECH TECHNOLOGY CO., LTD.
FM2350TSIMP
1. SCOPE
This specification outlines the pertinent electrical requirements of the RF output
modulator which converts the FM video and FM audio signal into the RF signal for
television standard transmission system.
2.GENERAL SPECIFICATIONS
2-1. Output frequency 2350~2420MHz (I
2-2. Supply voltage B1 9.0+/-0.5V
B2 5V Max
B3 -1.0~-1.6V
2-3. Consumption current B1 95+/-10mA
B2 500mA Max (B3-1.2V)
2-4. Operation and storage Temperature 0-50oC
2-5 Conditions for guarantee Humidity 85% or less
2
C PLL controller from outside)
3.Test Conditions
3-1. Testing ambient conditions
Defined as temperature of 25+/-2oC and humidity of 65+/-5% RH.
Note: That temperatures of 5-30oC and humidity of 45-85%RH may be regarded
as standard.
3-2. Unit setting conditions
(1). Picture --10 step wave signal 1.5Vp-p(82Ohm load)
(2). Audio -- 1.0Vp-p of sine wave 1KHz
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COMTECH TECHNOLOGY CO., LTD.
FM2350TSIMP
4. Electrical Performance
4-1. Video system characteristics
Specification
Parameter Min Typ Max Unit Remark
4-1-1 Input impedance 1.3 K Measure at 0.5-5MHz
4-1-2 Input signal level 1.0 Vp-p Load of 82Ohm connected
negative synchronous
4-1-3 Modulation Fp: 2480 MHz 2 3 4 MHz Superimposed sinuous wave.
sine wave 300 KHz 1Vp-p (3.58MHz)is 20% of the step input
4-1-4 Differential gain -8 8 % level measure under the apl of
10-90% differential gain of
demodulator unit is to be
compensated
4-1-5 Differential phase -8 8 deg -ditto 4-1-6 S/N 45 dB Measure with respect to standard
demodulator output.
4-1-7 Out level taper 4 6 dB fp 2350~2420MHz
4-2. Audio system characteristics
4-2-1 Input impedance 1.4 KOhm Measure at 0.1-10KHz
4-2-2 Modulation 35 40 45 KHz
4-2-3 Distortion factor 3 % Audoi input signal 1.0Vp-p 1KHz
modulation 50% (sine wave) video
input signal all black (sync only)
use standard demodulator of inter
-carrier system.
De-emphasis(50 usec) is on.
4-2-4 S/N 40 dB The same as 4-2-3
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COMTECH TECHNOLOGY CO., LTD.
4-3. Output system characteristics
Specification.
Parameter Min Typ Max Unit Remark
4-3-1 Video carrier frequency -50 fp +50 K H z Test at 25OC temperature and
4-3-2 Video output level 23 24 26 dBm 65%RH of humidity
(B3 -1.2V) Fp 2350~2420MHz
Fs1 6.0 MHz
4-3-3 Audio output level 22 27 32 dB Fs2 6.5 MHz
difference(p/s ratio) *output channel
4-3-4 Audio carrier frequency -8 fs +8 K H z Input signal none the measurement
is taken after 30 sec. from the
power-on.
4-3-5 Audio modulator fs1 35 50 65 KH z Measurement difference video of
fs2 35 50 65 carrier frequency output level for
FM2350TSIMP
4-3-6 Out-band spurious 45 50 dB 2350~2420MHz. except to fp. fp
4-3-7 In-band spurious 60 dB +/- fs against video carrier output
with bandwidth level
4-3-8 Output impedance 50 Oh m Unbalanced.
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COMTECH TECHNOLOGY CO., LTD.
5-1. PLL section characteristics
No Item Specification notes
5-2. IIC Bus
(1) SDA.SCL Under standard test condition
Input voltage Condition Min Ty p Max
High voltage 3 5
Low voltage 0 1.5 V
(2) Address C2 (on write date format)
(3) SDA SCL SDA/SCL are in the high impedance
Input impedance and there should be no reliablity
problem with 5V continually on the
SDA/SCL,if power supply is switched off.
(4) Data format MSB LSB
FM2350TSIMP
Address 1 1000MA1MA00AByte1
Programmable 14 13 12 11 10 9 8
Divider 0 2222222AByte2
Programmable 7 6 5 4 3 2 1 0
Divider 2 2222222AByte3
Charge pump (0) (0)
and test bits 1 cp t1 t0 1 1 1 os A Byte4
I/O port control bits p7 p6 p5 p4 p3 p2 p1 p0 A Byte5
Table 1 write data format (MSB is transmitted first)
Address 1 1000MA1MA21AByte1
Status byte POR FL I 2 I 1 I0 A2 A1 A0 A Byte2
Table 2 read date format
A: Acknowledge bit.
MA1,MA0: Voltage address bits.
CP: Charge pump current select.
T1: Test mode selection,T0:Charge pump disable
OS: V aractor drive output disable switch.
P7,P6,P5,P4,P3,P2,P1,P0: Control output states.
POR: Power on reset indicator
FL: Phase lock detect flag
I2,I1,I0: Digital information from ports P7,P5,and P4.
A2,A1,A0: 5 level adc data from P6
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COMTECH TECHNOLOGY CO., LTD.
FM2350TSIMP
level
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