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| 型号： | EV-ADF4153SD1Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADF4153SD1Z |
| 标准包装： | 1 |
| 系列： | * |
Data Sheet
ADF4153
Rev. F | Page 17 of 24
When a power-down is activated, the following events occur:
1. All active dc current paths are removed.
2. The synthesizer counters are forced to their load state
conditions.
3. The charge pump is forced into three-state mode.
4. The digital lock detect circuitry is reset.
5. The RFIN input is debiased.
6. The input register remains active and capable of loading
and latching data.
Lock Detect Precision (LDP)
When DB5 is programmed to 0, 24 consecutive PFD cycles of
15 ns must occur before digital lock detect is set. When this bit
is programmed to 1, 40 consecutive reference cycles of 15 ns
must occur before digital lock detect is set.
Phase Detector Polarity
DB6 in the ADF4153 sets the phase detector polarity. When the
VCO characteristics are positive, this should be set to 1. When
they are negative, it should be set to 0.
Charge Pump Current Setting
DB7, DB8, DB9, and DB10 set the charge pump current setting.
This should be set to the charge pump current that the loop
filter is designed with (see Table 9).
REFIN Doubler
Setting DB11 to 0 feeds the REFIN signal directly to the 4-bit RF
R counter, disabling the doubler. Setting this bit to 1 multiplies
the REFIN frequency by a factor of 2 before feeding into the 4-bit
R counter. When the doubler is disabled, the REFIN falling edge
is the active edge at the PFD input to the fractional synthesizer.
When the doubler is enabled, both the rising and falling edges
of REFIN become active edges at the PFD input.
When the doubler is enabled and the lowest spur mode is chosen,
the in-band phase noise performance is sensitive to the REFIN
duty cycle. The phase noise degradation can be as much as 5 dB
for the REFIN duty cycles outside a 45% to 55% range. The phase
noise is insensitive to the REFIN duty cycle in the lowest noise
mode and in the lowest noise and spur mode. The phase noise
is insensitive to REFIN duty cycle when the doubler is disabled.
The maximum allowed REFIN frequency when the doubler is
enabled is 30 MHz.
NOISE AND SPUR REGISTER, R3
With R3[1, 0] set to [1, 1], the on-chip noise and spur register
is programmed. Table 10 shows the input data format for
programming this register.
Noise and Spur Mode
Noise and spur mode allows the user to optimize a design either
for improved spurious performance or for improved phase
noise performance. When the low spur setting is chosen, dither
is enabled. This randomizes the fractional quantization noise so
that it resembles white noise rather than spurious noise. As a
result, the part is optimized for improved spurious
performance. This operation would normally be used when the
PLL closed-loop bandwidth is wide, for fast-locking applica-
tions. (Wide-loop bandwidth is seen as a loop bandwidth
greater than 1/10 of the RFOUT channel step resolution (fRES).) A
wide-loop filter does not attenuate the spurs to the same level as
a narrow-loop bandwidth.
When the low noise and spur setting is enabled, dither is
disabled. This optimizes the synthesizer to operate with
improved noise performance. However, the spurious
performance is degraded in this mode compared to the low
spur setting.
To further improve noise performance, the lowest noise setting
option can be used, which reduces the phase noise. As well as
disabling the dither, it also ensures that the charge pump is
operating in an optimum region for noise performance. This
setting is extremely useful where a narrow-loop filter band-
width is available. The synthesizer ensures extremely low noise
and the filter attenuates the spurs. The typical performance
characteristics give the user an idea of the trade-off in a typical
W-CDMA setup for the different noise and spur settings.
RESERVED BITS
These bits should be set to 0 for normal operation.
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