
ST70136
16/24
5.4 - Transmit Path Specifications
TA = 0 to 70°C unless otherwise specified. The following specifications are guaranteed only when the
Digital Control Interface is not active.
Notes: a. This will represents the 0dBr for the other specifications in the present table. The level is mesured for the frequency of 30KHz
which will correspond to the reference frequency. Variations include process, temperature and power variations.
b. This gain is given relatively to the 0dBr previously defined. Variations include process, temperature and power variations.
c. Ratio between max peak amplitude of one of the 2 single tones to any spurious. Measure performed for a dual tone signal (each
tone with an amplitude equal to -6dBr), in range 30KHz to 1MHz (couple (f1,f2) are (70KHz, 80KHz), (120KHz, 130KHz)).
d. Ration between max peak amplitude of one of the 2 single tones to any spurious. Measure performed for a (250KHz, 260KHz) dual
tone signal (each tone with an amplitude equal to -6dBr), in range 30KHz to 1MHz.
Table 10 :
Transmit Path Specifications
Typical specifications apply for VCC = 5.0V, temperature = 27°C, nominal process and bias current. Maximum and
minimum performance is with VCC ±5%, 0°C < T
ambient
< 70°C, and worst case process and bias current.
Description
Min.
Typ.
Max.
Unit
Comments
Input word rate
8.832
MHz
Input word resolution
16
bits
PGAP/PGAN OUTPUT
Common mode voltage
2.4
2.5
2.6
V
Measured on each output
Load resistance
500
Single ended
Load capacitance
10
pF
Single ended
Output Impedance
1
5
Single ended
Reference Output signal
a
-5%
2.4
+5%
Vp
Hz
Differential output @0dB gain for TxPGA
Output noise
45
See also mask diagram below ("Final
PGAP/N noise mask")
Cutoff frequency
4
MHz
@-3dB
Gain,0
≤
D
≤
15
step size 1dB
b
-D-0.5
-D
-D+0.5
dB
Programmable attenuator.
Step size
0.8
1
1.2
dB
TXP/TXN OUTPUT
Common mode voltage
2.4
2.5
2.6
V
Measured on each output
Load resistance
500
Single ended
Load capacitance
10
pF
Single ended
Output Impedance
1
5
Single ended
Output SDR
2 tones ADSL/POTS
2 tones ADSL/ISDN
c
d
79
71
dB
For TxPGA gain = 0dB
--nV