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參數(shù)資料
| 型號： | AD7002AS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | LC2MOS GSM Baseband I/O Port |
| 中文描述： | TELECOM, CELLULAR, BASEBAND CIRCUIT, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 455K |
| 代理商： | AD7002AS |
AD7002
–5–
REV. B
GMSK Phase Trajectory Error
This is a measure of the phase error between the transmitted
phase of an ideal GMSK modulator and the actual phase trans-
mitted by the AD7002, when transmitting a random sequence
of data bits. It is specified as a peak phase error and also as an
rms phase error.
Group Delay Linearity
The group delay linearity, or differential group delay, is the
group delay over the full band relative to the group delay at one
particular frequency. The reference frequency for the AD7002 is
1 kHz.
Group Delay Between Channels
This is the difference between the group delay of the I and Q
channels and is a measure of the phase matching characteristics
of the two.
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the DAC or ADC transfer function.
Maximum Phase Effect Instance
This is the time at which a transmitted data bit will have its
maximum phase change at the ITx and QTx outputs (see fig-
ure). This time includes the delay in the GMSK modulator and
in the Analog low-pass filters. Maximum phase effect instance is
measured from the Tx CLK falling edge, which latches the data
bit, to the ITx and QTx analog outputs.
90
°
0
°
≈
9
μ
s
DATA BIT
CLOCKED IN BY TxCLK
MAXIMUM PHASE
EFFECT INSTANT
T
F
45
°
Transmit Channel Maximum Phase Effect Instance
Output Rate
This is the rate at which data words are made available at the
Rx DATA pin (Mode 0) or the IDATA and QDATA pins
(Mode 1). There are two rates, depending on whether the de-
vice is operated in RATE0 or RATE1.
Offset Error
This is the amount of offset, w.r.t. V
REF
in the transmit DACs
and the auxiliary DACs and is expressed in mVs for the Trans-
mit section and in LSBs for the Auxiliary section.
Output Impedance
This is a measure of the drive capability of the auxiliary DAC
outputs and is expressed in k
s.
Output Signal Span
This is the output signal range for the Transmit Channel section
and the Auxiliary DAC section. For the transmit channel the
span is
±
1.25 volts centered on 2.5 volts, and for the Auxiliary
DAC section it is 0 to +V
REF
.
Output Signal Full-Scale Accuracy
This is the accuracy of the full-scale output (all 1s loaded to the
DACs) on each transmit channel measured w.r.t. 25 V and is
expressed in dBs.
Phase Matching Between Channels
This is a measure of the phase matching characteristics of the I
and Q transmit channels. It is obtained by transmitting all ones
and then measuring the difference between the actual phase
shift between the I and Q outputs and the ideal phase shift of
90
°
.
Sampling Rate
This is the rate at which the modulators on the receive channels
sample the analog input.
Settling Time
This is the digital filter settling time in the AD7002 receive
section. On initial power-up, or after returning from the sleep
mode, it is necessary to wait this amount of time to obtain use-
ful data.
Signal Input Span
The input signal range for the I and Q channels is biased about
V
REF
. It can go
±
1.25 volts about this point.
Signal to (Noise + Distortion) Ratio
This is the measured ratio of signal-to-(noise + distortion) at the
output of the receive channel. The signal is the rms amplitude of
the fundamental. Noise is the rms sum of all amplitude of the
fundamental. Noise is the rms sum of all nonfundamental sig-
nals up to half the sampling frequency (f
S
/2), excluding dc. The
ratio is dependent upon the number of quantization levels in the
digitization process; the more levels, the smaller the quantiza-
tion noise. The theoretical signal-to-(noise+distortion) ratio for
a sine wave is given by:
Signal to (Noise + Distortion) = (6.02N + 1.76) dB
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