TCM4400 Datasheet, PDF (25/72 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

2.12 Voice Downlink Path
2.12.1 Global Characteristics of Voice Downlink Path
PARAMETER
TEST CONDITIONS
Maximum
5% distortion and 150 Ω
output swing
(EARP_ EARN) 5% distortion and 33 Ω
Minimum output resistive load at
EARP_EARN
Output swing 3.9 Vpp
Output swing 1.5 Vpp
Maximum output capacitive load at
EARP_EARN
Earphone amplifier gain
Earphone amplifier state in power down
Maximum output swing (AUXO), 5%
distortion, maximum
Load = 1 kΩ
Minimum output resistive load at AUXO
AC coupled
Maximum output capacitive load at AUXO
Auxo amplifier gain
Auxo amplifier state in power down
VOLCTL code = 010
VOLCTL code = 110
Volume control gains
VOLCTL code = 000 (default and
reference)
VOLCTL code = 100
VOLCTL code = 011
VOLCTL code = 101 or 001 or
111 (mute)
VDLPGA code = 0000
(default)
– 6dB
VDLPGA code = 0001
VDLPGA code = 0010
– 5dB
– 4dB
VDLPGA code = 0011
VDLPGA code = 0100
– 3dB
– 2dB
PGA gain steps
VDLPGA code = 0101
VDLPGA code = 0110
(ref)
–1dB
0dB
VDLPGA code = 0111
1dB
VDLPGA code = 1000
2dB
VDLPGA code = 1001
3dB
VDLPGA code = 1010
4dB
VDLPGA code = 1011
5dB
VDLPGA code = 1100
6dB
MIN TYP
3.1 3.92
1.2 1.5
120 150
30
33
0
HiZ
1.6 1.96
1.0 1.2
– 6dB
HiZ
–1
0
–7 –6
– 12
– 19 – 18
– 25 – 24
– 6.5 – 6.0
– 5.5
– 4.5
– 3.7
– 2.3
– 1.7
– 5.0
– 4.0
– 3.2
– 1.8
– 1.2
0
0.5 1.0
1.4 1.9
2.6 3.1
3.4 3.9
4.3 4.8
5.5 6.0
MAX
UNIT
Vpp
Vpp
Ω
Ω
100 pF
dB
Vpeak
kΩ
100 pF
dB
1
–5
dB
– 17
– 23
– 40
– 5.5
– 4.5
– 3.5
– 2.7
– 1.3
– 0.7
dB
1.5
2.4
3.6
4.4
5.3
6.5
2–11