TCM4400 Datasheet, PDF (26/72 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

2.12.1 Global Characteristics of Voice Downlink Path (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
VDLST code = 1101 – 23dB – 24.6 – 24.1 – 23.6
VDLST code = 1100 – 20dB – 21.1 – 20.6 – 20.1
VDLST code = 0110 –17dB – 18.3 – 17.8 – 17.3
VDLST code = 0010 –14dB – 14.8 – 14.3 – 13.8
Sidetone gain steps
VDLST code = 0111
VDLST code = 0011
–11dB – 12.3 – 11.8 – 11.3
– 8dB – 8.8 – 8.3 – 7.8
VDLST code = 0000
(ref)
– 5dB – 5.3 – 4.8 – 4.3
VDLST code = 0100 – 2dB – 2.1 – 1.6 – 1.1
VDLST code = 0001
1dB 0.7 1.2 1.7
VDLST code = 1000 Mute
– 60 – 55
Power supply rejection, 0 Hz – 100 kHz
In the band
48
UNIT
dB
dB
2.12.2 Frequency Response of the Voice Band Downlink Path
PARAMETER
TEST CONDITIONS MIN TYP
100 Hz
– 5.8
150 Hz
– 3.6
200 Hz
– 2.5
300 Hz
– 3 –1.4
1000 Hz
Reference point
0
Frequency response (gain relative to
reference gain at 1 kHz)
2000 Hz
3000 Hz
–1 – 0.6
–1 – 0.15
3400 Hz
– 3 – 0.35
3600 Hz
– 9.0
3800 Hz
– 21.0
4000 Hz
– 32.0
> 4600 Hz
– 60.0
MAX
–5
–2
1
1
1
1
1
–6
–15
– 28
UNIT
dB
2.12.3 Psophometric SNR vs Signal Level Downlink Path
PARAMETER
TEST CONDITIONS
– 45 dBm0
– 40 dBm0
– 30 dBm0
Signal level
– 20 dBm0
– 10 dBm0
– 3 dBm0
0 dBm0
Idle channel noise, 0 Hz – 30 kHz
Crosstalk with the uplink path
MIN TYP MAX UNIT
25
30
40
42
dB
45
42
35
– 71 dBm
– 66 dB
2–12