uaa3515a NXP Semiconductors, uaa3515a Datasheet - Page 8

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

Philips Semiconductors
7
7.1
7.1.1
The UAA3515A is used in a cordless telephone handset
and in a base unit. The handset unit is battery powered
and operates on three NiCd cells. The minimum supply
voltage (V
7.1.2
When the UAA3515A is used in a handset, it is important
to minimize current consumption. The main operating
modes are:
Table 1 Power operating modes
Table 2 Powered circuit blocks
Notes
1. In RX and active mode, the crystal oscillator is activated automatically. An external frequency can be forced at the
2. In RX and active mode, the voltage reference is enabled automatically (whether bit V
3. If the voltage doubler is enabled, the crystal oscillator is activated automatically.
4. In inactive mode the amplifier is disabled automatically.
2002 Sep 09
Voltage reference adjustment
RF receiver
RX PLL
RX and TX audio paths
RF TX (and PA, when enabled)
Crystal oscillator; note 1
Clock output buffer
Voltage reference enable; note 2
Power amplifier (PA2 = 1)
Voltage doubler enable; note 3
Hard limiter and ALC not disabled
Earpiece amplifier (earpiece enable = 1); note 4
Active mode (talk): all blocks are powered
RX mode: all circuits in the receiver part are powered
900 MHz analog cordless telephone IC
crystal pins XTALI and XTALO.
FUNCTIONAL DESCRIPTION
Power supply and power management
P
P
CC
OWER SUPPLY
OWER SAVING
) is 2.9 V.
CIRCUIT BLOCK
CIRCUIT BLOCK
8
Latch memory is maintained in all modes. Blocks that are
powered are shown in Table 1 per operating mode.
The crystal oscillator, the clock output buffer, the voltage
reference adjustment, the power amplifier, the voltage
doubler, the earpiece, the hard limiter and the ALC can be
activated separately. Blocks that can be activated in each
mode are shown in Table 2.
ACTIVE MODE
ACTIVE MODE
Inactive mode: with the exception of the microcontroller
interface, all circuits are powered-down. The crystal
reference oscillator, the output clock buffer, the voltage
regulator and the voltage doubler can be disabled
separately. To reduce microcontroller current
consumption, the crystal frequency to the clock output
can be divided by 128. A low current consumption mode
for the crystal oscillator can be programmed.
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
RX MODE
power OFF
power OFF
power OFF
power OFF
RX MODE
power ON
power ON
power ON
power ON
power ON
power ON
power ON
power ON
REG
enable is logic 0 or 1).
Product specification
UAA3515A
INACTIVE MODE
INACTIVE MODE
power OFF
power OFF
power OFF
power OFF
power OFF
power OFF
power OFF
power OFF
power ON
power ON
power ON
power ON