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參數(shù)資料
| 型號(hào)： | ADF4002BCPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 7/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC PLL FREQUENCY SYNTH 20-LFCSP |
| 設(shè)計(jì)資源： | Very Low Jitter Encode (Sampling) Clocks for High Speed Analog-to-Digital Converters Using ADF4002 (CN0003) |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 類(lèi)型： | 時(shí)鐘/頻率合成器（RF），相位檢測(cè)器 |
| PLL： | 是 |
| 輸入： | CMOS，TTL |
| 輸出： | 時(shí)鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:1 |
| 差分 - 輸入:輸出： | 是/無(wú) |
| 頻率 - 最大： | 400MHz |
| 除法器/乘法器： | 是/無(wú) |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤(pán)，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-ADF4002EBZ1-ND - BOARD EVAL FOR ADF4002 |
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Data Sheet
ADF4002
Rev. C | Page 15 of 20
FUNCTION LATCH
With C2, C1 set to 1, 0, the on-chip function latch is
programmed. Figure 18 shows the input data format for
programming the function latch.
Counter Reset
DB2 (F1) is the counter reset bit. When this bit is set to 1, the
R counter and the N counter are reset. For normal operation,
set this bit to 0. Upon powering up, the F1 bit needs to be
disabled (set to 0). Then, the N counter resumes counting in
close alignment with the R counter (the maximum error is one
prescaler cycle).
Power-Down
DB3 (PD1) and DB21 (PD2) provide programmable power-
down modes. These bits are enabled by the CE pin.
When the CE pin is low, the device is immediately disabled
regardless of the states of the PD2, PD1 bits.
In the programmed asynchronous power-down, the device
powers down immediately after latching a 1 into Bit PD1, with
the condition that Bit PD2 has been loaded with a 0.
In the programmed synchronous power-down, the device
power-down is gated by the charge pump to prevent unwanted
frequency jumps. Once the power-down is enabled by writing
a 1 into Bit PD1 (on condition that a 1 has also been loaded to
Bit PD2), then the device enters power-down on the occurrence
of the next charge pump event.
When a power-down is activated (either in synchronous or
asynchronous mode, including a CE pin activated power-
down), the following events occur:
All active dc current paths are removed.
The R, N, and timeout counters are forced to their load
state conditions.
The charge pump is forced into three-state mode.
The digital lock detect circuitry is reset.
The RFIN input is debiased.
The reference input buffer circuitry is disabled.
The input register remains active and capable of loading
and latching data.
MUXOUT Control
The on-chip multiplexer is controlled by M3, M2, and M1 on
the ADF4002. Figure 18 shows the truth table.
Fastlock Enable Bit
DB9 of the function latch is the fastlock enable bit. Only when
this is 1 is fastlock enabled.
Fastlock Mode Bit
DB10 of the function latch is the fastlock mode bit. When
fastlock is enabled, this bit determines the fastlock mode to be
used. If the fastlock mode bit is 0, then Fastlock Mode 1 is
selected, and if the fastlock mode bit is 1, then Fastlock Mode 2
is selected.
Fastlock Mode 1
In this mode, the charge pump current is switched to the
contents of Current Setting 2. The device enters fastlock by
having a 1 written to the CP gain bit in the N counter latch. The
device exits fastlock by having a 0 written to the CP gain bit in
the AB counter latch.
Fastlock Mode 2
In this mode, the charge pump current is switched to the
contents of Current Setting 2. The device enters fastlock by
having a 1 written to the CP gain bit in the N counter latch. The
device exits fastlock under the control of the timer counter.
After the timeout period determined by the value in TC4 to
TC1, the CP gain bit in the N counter latch is automatically
reset to 0 and the device reverts to normal mode instead of
fastlock. See Figure 18 for the timeout periods.
Timer Counter Control
The user has the option of programming two charge pump
currents. The intent is to use the Current Setting 1 when the
RF output is stable and the system is in a static state. Current
Setting 2 is meant to be used when the system is dynamic and
in a state of change, that is, when a new output frequency is
programmed.
The normal sequence of events is as follows:
The user initially decides the referred charge pump currents.
For example, the choice can be 2.5 mA as Current Setting 1 and
5 mA as Current Setting 2.
At the same time, the decision must be made as to how long the
secondary current is to stay active before reverting to the
primary current. This is controlled by Timer Counter Control
Bit DB14 to Timer Counter Control Bit DB11 (TC4 to TC1) in
the function latch. See Figure 18 for the truth table.
To program a new output frequency, simply program the N
counter latch with a new value for N. At the same time, the CP
gain bit can be set to 1. This sets the charge pump with the
value in CPI6 to CPI4 for a period of time determined by TC4
to TC1. When this time is up, the charge pump current reverts
to the value set by CPI3 to CPI1. At the same time, the CP gain
bit in the N counter latch is reset to 0 and is ready for the next
time that the user wishes to change the frequency.
Note that there is an enable feature on the timer counter. It is
enabled when Fastlock Mode 2 is chosen by setting the Fastlock
Mode Bit DB10 in the function latch to 1.
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