uaa3515a NXP Semiconductors, uaa3515a Datasheet - Page 23

• Manufacturer Part Number: uaa3515a
• Description: 900 Mhz Analog Cordless Telephone Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.9.5
The TX and RX audio signal paths each have a programmable gain block. If a TX or RX voltage gain other than the
nominal power-up default is desired it can be programmed through the microcontroller interface. The gain blocks can be
used during final telephone testing to adjust electronically gain tolerances in the telephone system. The RX gain and the
TX gain controls have steps of 0.5 dB covering a dynamic range of 7.5 to +8.0 dB. Measured on the earpiece amplifier
output, RX gain steps are multiplied by 2 due to the expander slope. A dynamic range of 15 to +16 dB at the earpiece
amplifier supports a volume control feature that can be implemented in the telephone and compensate for gain
tolerances. Volume control can also be performed externally with hardware switches on various resistor values.
Table 11 RX and TX gain control registers
2002 Sep 09
BIT 4
900 MHz analog cordless telephone IC
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TX
BIT 3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
AND
RX
BIT 2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
GAIN CONTROL REGISTERS
BIT 1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BIT 0 GAIN CONTROL
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
1
2
3
4
5
6
7
8
9
23
RX GAIN (dB)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
EARO (dB)
10.0
11.0
12.0
13.0
14.0
15.0
16.0
15.0
14.0
13.0
12.0
11.0
10.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
Product specification
UAA3515A
TX GAIN (dB)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0