uaa3515a NXP Semiconductors, uaa3515a Datasheet - Page 11

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

Philips Semiconductors
7.2.1
The data comparator is an inverting hysteresis
comparator. An external bandpass filter is connected
between pins DETO and DATI (AC-coupled). The
open-collector output is current limited to control the output
signal slew rate. An external resistor of 180 k should be
connected between pin DATO and V
capacitor in parallel with this resistor will reduce the slew
rate.
2002 Sep 09
handbook, full pagewidth
900 MHz analog cordless telephone IC
D
ATA COMPARATOR
V CC
C S
L P
TXPD
TXLF
PAO
16
14
13
VB mod
CC
. An external
18
MODI
Fig.4 Transmitter block diagram.
AMPLIFIER
SUMMING
19
MODO
VB
SYNTHESIZER
FREQUENCY
DUAL PLL
XTAL
11
REGULATOR
VOLTAGE
Data TX
7.3
The transmitter architecture is of the direct modulation
type. The transmit VCO can be frequency modulated by
speech or data (see Fig.4). An amplifier sums the
modulating signal with the data TX signal before the VCO.
Frequency control is affected by integrated variable
capacitance diodes. To obtain the correct frequency,
external inductors in series with the bonding wires and
leadframe are required. The power amplifier is capable of
driving a 50
programmed with two bits via the serial bus interface.
TX
Transmitter
V CC(VTX)
21
load. The level of the output signal PAO is
TXLOX
22
TX VCO
UAA3515A
TXLOY
23
FCA296
Product specification
UAA3515A
TXO
26