Specifications

DTT 7685x
SBU Technology – Tuners ATSC half NIM with Ch 3 / 4 modulator
20 Apr 2007
Preliminary Specification Page 10 / 29
No Parameters Unit Min Typ Max Remarks
20.
LO Voltage at the
Antenna
5 -- 54MHz
54 -- 864MHz
864 -- 1810MHz
dBuV
10
33
51
21. Tuning Response Time ms 30 100
22. Differential D-IF out Pin 20 & 21 Vp-p 1.0
23. IF AGC Voltage V 0.5 3.3
24. IF AGC Range dB 43 48
25. LO Level at IF Output dBuV 88
26. Overall Tuner Gain dB 72 80
See Appendix 12.5
For testing condition
7.2 Ch 3/ 4 modulator performance
No Parameters Unit Min Typ. Max Remarks
1. Video carrier frequency accuracy KHz -25 25
2. Video carrier output level dBuV 70 73 No signal
3. Video carrier frequency stability KHz -25 25 Ta = 25°C ±10
4. Audio carrier output ratio dB 13.0 15.5 18.0
5. Audio 2
nd
harmonic distortion dB 50 65 fpc+2x4.5MHz
6. Audio 3
rd
harmonic distortion dB 45 55 fpc+3x4.5MHz
7. Video harmonic distortion dB 45 72
8. Video modulation depth % 75 80 85
10 step grey scale @1Vp-p
input,75Ω loaded
9. Video S/N dB 50
Un-weighted @1Vp-p input,
50% white
10. Video frequency response dB -1.1 0.3 0.75 ~3.75MHz
11. Differential gain % -5 5
12. Differential phase °C -5 5
13. Audio modulation depth % 90 100 110
Sound I/P = 1KHz @ 1vp-p,
100% equals to 25kHz dev
14. Audio distortion % 1 2 Sound I/P = 1KHz;
15. Audio S/N dB 45 50
Sound I/P = 1KHz;
Video Color bar