U4090B-P Datasheet, PDF (20/35 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit EMI Improved

Table 7-4. Specification of Logic Levels
Logic Level
0 = < (0.3V)
Z = > (1V) < (VMP – 1V) or (open input)
1 = > (VMP – 0.3V)
8. Explanation of Abbreviations
RECATT = Receive attenuation
STIS, STIL = Inputs of sidetone balancing amplifiers
ES = External supply
AFS = Acoustic feedback suppression control
AGA = Automatic gain adjustment
RA2 = Inverting receive amplifier
TXACL = Transmit anti-clipping control
Figure 8-1. Typical DC Characteristic
12
10
RDC = infinity
8
RDC = 68k
6
4
RDC = 130k
2
0
0
10
20 30
40
50 60
70 80
90 100
I_L (mA)
Figure 8-2. Typical Adjustment Range of Transmit Gain
53
51
49
47
45
43
41
39
37
35
0
5
10
15
20
25
30
35
40
RGT (kΩ)
20 U4090B-P
4741C–CORD–11/05