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參數(shù)資料
| 型號： | SY89429AZC TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SYNTHESIZER FREQ PROGR 28SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | Precision Edge® |
| 類型： | 頻率合成器 |
| PLL： | 是 |
| 輸入： | PECL，晶體 |
| 輸出： | PECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 800MHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 3.135 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SY89429AZCTR SY89429AZCTR-ND |
5
Precision Edge
SY89429A
Micrel, Inc.
M,N
S_CLOCK
S_DATA
S_LOAD
P_LOAD
M[ 8 :0 ]
N[1 :0 ]
T 2 T 1 T 0 N1 N0 M8 M7 M6 M5 M4 M3 M2 M1 M0
PROGRAMMING INTERFACE
Programming the device is accomplished by properly
configuring the internal dividers to produce the desired
frequency at the outputs. The output frequency can be
represented by this formula:
Where FXTAL is the crystal frequency, M is the loop divider
modulus, and N is the output divider modulus. Note that it is
possible to select values of M such that the PLL is unable to
achieve loop lock. To avoid this, always make sure that M is
selected to be 200 M 400 for a 16MHz input reference.
M[8:0] and N[1:0] are normally specified once at power-on,
through the parallel interface, and then possibly again through
the serial interface. This approach allows the designer to
bring up the application at one frequency and then change or
fine-tune the clock, as the ability to control the serial interface
becomes available. To minimize transients in the frequency
domain, the output should be varied in the smallest step size
possible.
The TEST output provides visibility for one of several
internal nodes (as determined by the T[1:0] bits in the serial
configuration stream). It is not configurable through the
parallel interface. Although it is possible to select the node
that represents FOUT, the TTL output may not be able to
toggle fast enough for some of the higher output frequencies.
The T2, T1, T0 configuration latches are preset to 000 when
P_LOAD is low, so that the FOUT outputs are as jitter-free as
possible. The serial configuration port can be used to select
one of the alternate functions for this pin.
The Test register is loaded with the first three bits, the N
register with the next two and the M register with the final eight
bits of the data stream on the S_DATA input. For each register
the most significant bit is loaded first (T2, N1 and M8).
When T[2:0] is set to 100 the SY89429A is placed in PLL
bypass mode. In this mode the S_CLOCK input is fed directly
into the M and N dividers. The N divider drives the FOUT
differential pair and the M counter drives the TEST output
pin. In this mode the S_CLOCK input could be used for low
speed board level functional test or debug. Bypassing the
PLL and driving FOUT directly gives the user more control
on the test clocks sent through the clock tree (See detailed
Block Diagram). Because the S_CLOCK is a TTLlevel the input
frequency is limited to 250MHz or less. This means the fastest
the FOUT pin can be toggled via the S_CLOCK is 125MHz as
the minimum divide ratio of the N counter is 2. Note that the
M counter output on the TEST output will not be a 50% duty
cycle due to the way the divider is implemented.
Input S_DATA to M0 then M1, then M2, etc., as indicated above.
First
Bit
Last
Bit
T2
T1
T0
TEST
FOUT/FOUT
0
Data Out – Last Bit SR
FVCO ÷ N
0
1
HIGH
FVCO ÷ N
0
1
0
FREF
FVCO ÷ N
0
1
M Counter Output
FVCO ÷ N
1
0
FOUT
FVCO ÷ N
1
0
1
LOW
FVCO ÷ N
1
0
S_CLOCK ÷ M
S_CLOCK ÷ N
1
FOUT ÷ 4
FVCO ÷ N
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SY89429AZH | 功能描述:時鐘合成器/抖動清除器 Programmable Frequency Synthesizer (25-400MHz) (Green) RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SY89429AZH TR | 功能描述:時鐘合成器/抖動清除器 Programmable Frequency Synthesizer (25-400MHz) (Green) RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SY89429AZHTR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:PROGRAMMABLE FREQUENCY SYNTHESIZER (25MHz to 400MHz) |
| SY89429V | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:5V/3.3V PROGRAMMABLE FREQUENCY SYNTHESIZER 25MHz to 400MHz |
| SY89429V_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:5V/3.3V PROGRAMMABLE FREQUENCY SYNTHESIZER (25MHz to 400MHz) |
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