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參數(shù)資料
| 型號(hào)： | DE6003-002 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 315K |
| 代理商： | DE6003-002 |
DE6003
9
Dynamic Characteristics – Notes to Table 7
1. Transmitter Power Output
Selectable by control line, to high or low output power
setting. Power levels are for any channel into 50
and
measured at ANT1. Output ripple is measured over
5 channels.
2. Transmitter Power Amplifier Control, PAOFF
(t
1
,t
2
and
t
6
–
see Fig. 3)
This control is used in conjunction with the RX/TX. PAOFF is
included to allow the power amplifier to be turned on after
RX/TX has been set low to transmit (
t
6
,
rising to 90% in
t
1
)
and off before being set high to receive (
t
2
). The power am-
plifier has been designed to switch on and off in this control-
led way to avoid generating unwanted emissions which would
be caused by simply turning the transmit power on and off.
3. Transmit Times
When in transmit mode, the transmit (700 MHz) PLL is
opened, preventing the PLL tracking the low frequency
components of the transmitted data. This puts a limit on the
maximum length of the data block which can be transmitted
and places a requirement of a delay between
switching to receive mode and transmit mode, in order for
the PLL to gain lock.
4. Transmit Delay
This is the time to convert the TXD data to the specified
frequency (FSK) for transmission. It is specified as the delay
from the 50% point of TXD to the output frequency reaching
50% of its deviation.
5. Receive Mode to Valid Transmit Data
(t
7
– see Fig. 3)
This is the cumulative minimum time taken to:
a.
switch from receive to transmit mode,
b.
Transmit to PA
on delay (RX/TX to PA switch-on delay that must be
allowed between switching from receive to transmit and
turning on the PA in order for sufficient energy to be built
up in the transmit chain before the PA is switched on),
c.
Switch on PA and
d.
Transmit delay
6. Transmitter Modulation (Data onto Carrier)
Spectrally shaped Continuous Phase Frequency Shift
Keying, spectrum-compliant with FCC 15.247. The DE6003
uses Spread Spectrum communication employing Frequency
Hopping with spectrally shaped CPFSK as the modulation
format. Spectral shaping is achieved with a Gaussian
approximation pre-modulation filter. 90% of the power is within
1MHz bandwidth.
7. Power On to Transmit Time
This is the time from V
being applied to the start of
transmission of valid data at the antenna port. This value
is very dependent on the power supply used, as all the
decoupling capacitors on the DE6003 have to be
charged and this energy must be supplied by the power
supply.
8. Standby to Transmit
(t
9
)
This is the time from standby to the start of transmission of
valid data at the antenna port.
9. Transmitter/Receiver Frequency Agility
(t
10
– see Figs.
4,5,6 and 7)
The DE6003 is designed to be used in a Frequency Hopping
Spread Spectrum Radio System. This requires fast channel
switching, which is defined as the time taken from the rising
edge of LOADB to the required channel being within 40kHz
of the frequency required.The operating channel should not
be switched until the output power has fallen to less than
10% after the power amplifier has been switched off when in
transmit mode.
10.Transmit/Receive Frequency Select
(t
13
,
t
14
and
t
15
–
see Fig. 4)
The DE6003 transceiver will operate over 101 channels
spaced at 1MHz intervals within the frequency band 2·400
to 2·500GHz. This is selected by setting SD (6:0) to the
desired channel number and strobing in the data by pulsing
LOADB low. When LOADB is low data ripples through a
transparent latch, and is loaded into synthesiser data hold
register on the rising edge of LOADB.
11.Receiver Sensitivity
A modulated signal of amplitude greater than or equal to the
value specified in Table 7 injected at either antenna port will
exhibit a Bit Error Rate of no more than 10
5
at 625 kb/s.
GPS measure this by applying a signal modulated with a
pseudo random DATA stream (2
15
1)and modulated with an
Anritsu MD6420A Transmission analyser , together with a
Marconi Instruments 2031 signal source for TXD and a
signal shaping filter with the characteristics of the DE6003
transmitter filter. The receive data clock used is the transmit
data clock delayed by 400ns to enable centre-bit sampling
(optimum sampling).
12.Receiver Max. Input Signal
This is defined for all channels as the maximum receiver
input signal level for a 10
5
bit error rate.
13. Receiver Data Bit Period
(t
16
– see Fig. 8)
Data bit period (
t
16
) is the nominal time between each
successive data bit.This period is subject to jitter on
receive and will be continually changing within the bit
period specification.
The DE6003 is configured for 625 kb/s and data run length
of contiguous ‘0’s or ‘1’s limited to 16 or less; any deviation
from this may result in a lowering of sensitivity. The
received RXD data stream will meet the bit width
restrictions for ‘1’s and ‘0’s as defined in Table 7. This is
referenced to the nominal centre of a bit period. Two bit
width measurements are used to determine the correct
operation of the demodulation circuitry, the first for pseudo-
random data and the second to measure the effects of
continuous patterns of 16 ‘1’s followed by a single ‘0’ and
of 16 ‘0’s followed by a single ‘1’.
NOTE: Received data (RXD) is considered valid when
these specifications have been met.
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