uaa2062 NXP Semiconductors, uaa2062 Datasheet - Page 8

• Manufacturer Part Number: uaa2062
• Description: Analog Cordless Telephone Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
D
The data comparator is an inverting hysteresis
comparator. An external filter is connected between
pins DETO and DATI (AC-coupled). The open-collector
output is current limited to control the output signal slew
rate. The external resistor at pin DATO, connected to V
should be 220 k . An external capacitor in parallel with
this resistor will reduce the slew rate.
The transmit part
The transmitter architecture is of the direct modulation
type. The transmit VCO can be frequency modulated
either by speech or data (see Fig.4).
2000 Aug 10
handbook, full pagewidth
ATA COMPARATOR
Analog cordless telephone IC
LPF
data TX
TXPD
TXLF
TXO
2
3
6
VBMOD
MODI
10.24 MHz
Fig.4 Transmit schematic diagram.
SYNTHESIZER
FREQUENCY
summing
amplifier
DUAL PLL
5
MODO
CC
4
,
8
T
Before the VCO, an amplifier sums the modulating signal
and the data TX signal. The Colpitts type transmit VCO
includes integrated varicaps. Fixed external capacitors are
used to extend the tuning range for all countries.
The internal capacitors are programmed via the serial bus
interface. The power amplifier is capable of driving
50
via the serial bus interface. An internal regulator supplies
the TX VCO.
REG 3 V
RANSMIT
VB
TX VCO
AC. The output level is also programmed with 2 bits
V CC(AUTX)
15
VCO
PA
FCA122
10
9 LO3I
7 PAO
V REFTX
Product specification
UAA2062