Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

SA1630 Folha de dados(PDF) 11 Page - NXP Semiconductors

Nome de Peças SA1630
Descrição Electrónicos  IF quadrature transceiver
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SA1630 Folha de dados(HTML) 11 Page - NXP Semiconductors

Back Button SA1630 Datasheet HTML 7Page - NXP Semiconductors SA1630 Datasheet HTML 8Page - NXP Semiconductors SA1630 Datasheet HTML 9Page - NXP Semiconductors SA1630 Datasheet HTML 10Page - NXP Semiconductors SA1630 Datasheet HTML 11Page - NXP Semiconductors SA1630 Datasheet HTML 12Page - NXP Semiconductors SA1630 Datasheet HTML 13Page - NXP Semiconductors SA1630 Datasheet HTML 14Page - NXP Semiconductors SA1630 Datasheet HTML 15Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 22 page
background image
Philips Semiconductors
Product specification
SA1630
IF quadrature transceiver
1998 Jul 21
11
I2
I1
I2
I1
V1
V2
CURRENT
VOLTAGE
SR00526
Figure 3.
Relative Output Current Variation
APPLICATION DESCRIPTION
General
The 1630 performs the IF modulator and demodulator functionality
for high–speed wireless data transceivers. The design is optimized
for IEEE 802.11 wireless LAN using 11 chips/symbol Direct
Sequence Spread Spectrum.
Transmitter
The IF quadrature transmitter baseband modulator input is driven
differentially by the D/A converters in the DSP chip. The baseband
signals are DC coupled for fast turn–on and turn–off and for
constant carrier testing. The typical common–mode input voltage is
VCC/2.
The open collector outputs of the mixers are biased by two
inductors, which are part of an LC tank. The LC tank matches the
output impedance of the mixers to the input impedance of the
upconverter chip (or any filter in between) and suppresses IF
harmonics.
An optional 2.5V reference is available during mode (3) and (5), the
transmit mode with Rx in standby. This reference can be enabled or
disabled via the 3 wire bus (in this mode). This voltage is provided
for use by an external current DAC if needed.
Receiver
The receiver part of the SA1630 consists of an IF Variable gain
amplifier, a quadrature demodulator and a pair of baseband
amplifiers. The IF amplifier has its gain controlled by the DSP chip.
This ensures linear operation of the receiver chain over a wide
dynamic range of input signals. Linear operation is essential for
resolving echo’s due to multipath reception.
The digital controlled AGC is meant for fast level training for the
receiver.
The high gain receiver, which is distributed between the IF and
baseband part facilitates interfacing with the RF front–end chip,
which normally have moderate gains (up to 20 dB), and SAW IF
filters, which mostly have considerable loss (up to 8 dB) without
external amplifiers.
The baseband amplifiers have a high drive capability (1 Vpp into
1k
Ω, 15 pF for VCC = 3V) that facilitates direct interfacing to the A/D
converter without active external elements.
The baseband amplifiers can interface directly to the Track/Hold
switch/capacitor combination with capacitance values up to 15 pF.
When sampled at 22MHz the output can settle to within 1/4 LSB
when swinging 1V p–p.
The chip has a unique mode in which the Rx is on standby while the
Tx is ON. In this mode the Rx Baseband circuits are idling at
reduced currents and all Rx I/O outputs retain their DC bias
unchanged from their values when the Rx was fully ON. This mode
is very essential if ac coupling through a large capacitor, such as,
10nF is used. From this mode the chip can quickly be switched to
the Rx ON mode (Tx OFF) without worrying about
charging/discharging the large AC coupling capacitor.
The VGA can be programmed in 2 ways: 1) Directly programming
external control pins. 2) programming over the serial 3–wire bus.
The former method can switch gain in less than 200 ns.
The Rx baseband section also incorporates simple low pass active
filters of the Sallen key type. The Rx bandwidth is mainly set by
these filters. The function of these filters is twofold: 1) attenuate high
frequency signals from the Rx mixers. 2) act as anti–aliasing filters
for any A to D converters following this chip.
IF synthesizer
The SA1630 has an integrated synthesizer that uses an external
VCO operating on twice the IF frequency. It is internally divided by 2
for obtaining quadrature signals. The divided VCO signal is not
externally available. This minimizes the LO feedthrough to the IF
input port and hence minimizes output dc glitches when the IF gain
is switched.
The PLL reference clock is derived from the 22 MHz DSP clock. The
available divider ratios facilitate both 1 and 2 MHz phase
comparison frequency from a 22 MHz and an optional 44 MHz clock
respectively. In essence the reference divider will have
programmable dividers ratios of 8, 11, 22 and 44.
The VCO shall be fed from a stabilized supply. Such a stabilized
supply is necessary in order to prevent oscillator jitters due to Rx/Tx
switching. The effect of oscillator jitters is further minimized when
using a high PLL loop bandwidth, which on its turn requires a high
phase comparison frequency (1 MHz, preferably 2 MHz).
If the IF Synthesizer is not used, the CLKIN pins should be
terminated to ac ground.
Serial Programming Input
The serial input is a 3–wire input (CLOCK, STROBE, DATA) to
program the counter ratios, charge pump current, status– and
DC–offset register, mode select and test register. The programming
data is structured into two 21–bit words; each word includes 4 chip
address bits and 1 subaddress bit. Figure 2 shows the timing
diagram of the serial input. When the STROBE = L, the clock driver
is enabled and on the positive edges of the CLOCK the signal on
DATA input is clocked into a shift register. When the STROBE = H,
the clock is disabled and the data in the shift register remains stable.
Depending on the value of the subaddress bit the data is latched
into different working registers. Table 3 shows the contents of each
word.
Default States
Upon power up (VCCDIG is applied) a reset signal is generated,
which sets all registers to a default state. The logic level at the


Nº de peça semelhante - SA1630

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
NXP Semiconductors
SA1638 PHILIPS-SA1638 Datasheet
271Kb / 26P
   Low voltage IF I/Q transceiver
1997 Sept 03
SA1638BE PHILIPS-SA1638BE Datasheet
271Kb / 26P
   Low voltage IF I/Q transceiver
1997 Sept 03
More results

Descrição semelhante - SA1630

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Anaren Microwave
250126 ANAREN-250126 Datasheet
178Kb / 1P
   Mixers Quadrature IF
logo
Maxim Integrated Produc...
MAX2510 MAXIM-MAX2510 Datasheet
126Kb / 12P
   Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator
19-1296; Rev 1; 1/98
MAX2510 MAXIM-MAX2510_V01 Datasheet
165Kb / 12P
   Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator
2018
logo
Intersil Corporation
HFA3765 INTERSIL-HFA3765 Datasheet
658Kb / 6P
   AGC and Quadrature IF Demodulator
HFA3724 INTERSIL-HFA3724 Datasheet
186Kb / 24P
   400MHz Quadrature IF Modulator/Demodulator
November 1999
logo
Marki Microwave
IQ-4509 MARKIMICROWAVE-IQ-4509 Datasheet
153Kb / 2P
   QUADRATURE-IF DOUBLE-BALANCED MIXERS
IQ-1545 MARKIMICROWAVE-IQ-1545 Datasheet
147Kb / 2P
   QUADRATURE-IF DOUBLE-BALANCED MIXERS
logo
Intersil Corporation
HFA3726 INTERSIL-HFA3726 Datasheet
162Kb / 21P
   400MHz Quadrature IF Modulator/Demodulator
November 1999
logo
Linear Technology
LT5502 LINER-LT5502_15 Datasheet
240Kb / 12P
   400MHz Quadrature IF Demodulator with RSSI
LT5502 LINER-LT5502 Datasheet
237Kb / 12P
   400MHz Quadrature IF Demodulator with RSSI
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com