參數(shù)資料
型號: AD9516-5BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 37/76頁
文件大?。?/td> 0K
描述: IC CLOCK GEN W/PLL 64-LFCSP
標準包裝: 1
類型: 時鐘發(fā)生器,扇出配送
PLL:
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:14
差分 - 輸入:輸出: 是/是
頻率 - 最大: 2.4GHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
AD9516-5
Rev. A | Page 42 of 76
A sync operation brings all outputs that have not been excluded (by
the nosync bit) to a preset condition before allowing the outputs to
begin clocking in synchronicity. The preset condition takes into
account the settings in each of the channel’s start high bit and its
phase offset. These settings govern both the static state of each
output when the sync operation is happening and the state and
relative phase of the outputs when they begin clocking again upon
completion of the sync operation. Between outputs and after
synchronization, this allows for the setting of phase offsets.
The AD9516 outputs are in pairs, sharing a channel divider per
pair (two pairs of pairs, four outputs, in the case of CMOS). The
synchronization conditions apply to both outputs of a pair.
Each channel (a divider and its outputs) can be excluded from
any sync operation by setting the nosync bit of the channel.
Channels that are set to ignore SYNC (excluded channels) do
not set their outputs static during a sync operation, and their
outputs are not synchronized with those of the nonexcluded
channels.
Clock Outputs
The AD9516 offers three output level choices: LVPECL, LVDS,
and CMOS. OUT0 to OUT5 are LVPECL differential outputs;
and OUT6 to OUT9 are LVDS/CMOS outputs. These outputs
can be configured as either LVDS differential or as pairs of
single-ended CMOS outputs.
LVPECL Outputs—OUT0 to OUT5
The LVPECL differential voltage (VOD) is selectable from 400 mV
to 960 mV (see Register 0x0F0[3:2] to Register 0x0F5[3:2]). The
LVPECL outputs have dedicated pins for power supply
(VS_LVPECL), allowing a separate power supply to be used.
VS_LVPECL can range from 2.5 V to 3.3 V.
GND
3.3V
OUT
0
7972
-033
Figure 47. LVPECL Output, Simplified Equivalent Circuit
The LVPECL output polarity can be set as noninverting or
inverting, which allows for the adjustment of the relative
polarity of outputs within an application without requiring a
board layout change. Each LVPECL output can be powered
down or powered up as needed. Because of the architecture of
the LVPECL output stages, there is the possibility of electrical
overstress and breakdown under certain power-down conditions.
For this reason, the LVPECL outputs have several power-down
modes. This includes a safe power-down mode that continues
to protect the output devices while powered down, although it
consumes somewhat more power than a total power-down. If
the LVPECL output pins are terminated, it is best to select the
safe power-down mode. If the pins are not connected (unused),
it is acceptable to use the total power-down mode.
LVDS/CMOS Outputs—OUT6 to OUT9
OUT6 to OUT9 can be configured as either an LVDS differential
output or as a pair of CMOS single-ended outputs. The LVDS
outputs allow for selectable output current from ~1.75 mA to ~7 mA.
OUT
3.5mA
079
72-
034
Figure 48. LVDS Output, Simplified Equivalent Circuit with
3.5 mA Typical Current Source
The LVDS output polarity can be set as noninverting or inverting,
which allows for the adjustment of the relative polarity of outputs
within an application without requiring a board layout change. Each
LVDS output can be powered down, if not needed, to save power.
OUT6 to OUT9 can also be CMOS outputs. Each LVDS output can
be configured to be two CMOS outputs. This provides for up to
eight CMOS outputs: OUT6A, OUT6B, OUT7A, OUT7B,
OUT8A, OUT8B, OUT9A, and OUT9B. When an output is
configured as CMOS, the CMOS Output A is automatically turned
on. The CMOS Output B can be turned on or off independently.
The relative polarity of the CMOS outputs can also be selected for
any combination of inverting and noninverting. See Table 52:
Register 0x140[7:5], Register 0x141[7:5], Register 0x142[7:5], and
Register 0x143[7:5].
Each LVDS/CMOS output can be powered down, as needed, to
save power. The CMOS output power-down is controlled by the
same bit that controls the LVDS power-down for that output.
This power-down control affects both CMOS Output A and
CMOS Output B. However, when CMOS Output A is powered up,
CMOS Output B output can be powered on or off separately.
OUT1/
OUT1
VS
07
97
2-
0
35
Figure 49. CMOS Equivalent Output Circuit
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