参数资料
型号: AD9557BCPZ
厂商: Analog Devices Inc
文件页数: 10/92页
文件大小: 0K
描述: IC CLOCK TRANSLATOR 40LFCSP
产品变化通告: Minor Mask Change 11/Apr/2012
标准包装: 1
类型: 时钟/频率转换器
PLL:
主要目的: 以太网,SONET/SDH
输入: CMOS,LVDS,LVPECL
输出: CMOS,HSTL,LVDS
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 是/是
频率 - 最大: 1.25GHz
电源电压: 1.71 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-VFQFN 裸露焊盘,CSP
供应商设备封装: 40-LFCSP-VQ(6x6)
包装: 托盘
AD9557
Data Sheet
Rev. B | Page 18 of 92
Pin No.
Mnemonic
Input/
Output
Pin Type
Description
15
A
OUT0
E
O
HSTL, LVDS,
1.8 V CMOS,
3.3 V CMOS
Complementary Output 0. This output can be configured as HSTL, LVDS, or
single-ended 1.8 V or 3.3 V CMOS.
16
OUT0
O
HSTL, LVDS,
1.8 V CMOS,
3.3 V CMOS
Output 0. This output can be configured as HSTL, LVDS, or single-ended 1.8 V
or 3.3 V CMOS. LVPECL levels can be achieved by ac coupling and using the
Thevenin-equivalent termination as described in the Input/Output Termination
20
LDO_VCO2
I
LDO bypass
Output PLL Loop Filter Voltage Regulator. Connect a 0.47 μF capacitor from this
pin to ground. This pin is also the ac ground reference for the integrated output
PLL external loop filter.
21
LF_VCO2
I/O
Loop filter
Loop Filter Node for the Output PLL. Connect an external 6.8 nF capacitor from
this pin to Pin 20 (LDO_VCO2).
25
A
RESETE
I
3.3 V CMOS
Chip Reset. When this active low pin is asserted, the chip goes into reset.
This pin has an internal 50 k pull-up resistor.
26
PINCONTROL
I
3.3 V CMOS
Pin Program Mode Enable Pin. When pulled high during startup, this pin enables
pin programming of the AD9557 configuration during startup. If this pin is low
during startup, the user must program the part via the serial port or use values
that are stored in the EEPROM.
27
A
SYNCE
I
3.3 V CMOS
Clock Distribution Synchronization Pin. When this pin is activated, output drivers
are held static and then synchronized on a low-to-high transition of this pin. This
pin has an internal 60 k pull-up resistor.
28
REFA
I
Differential
input
Reference A Input. This internally biased input is typically ac-coupled and, when
configured as such, can accept any differential signal with single-ended swing up
to 3.3 V. If dc-coupled, input can be LVPECL, LVDS, or single-ended CMOS.
29
A
REFAE
I
Differential
input
Complementary Reference A Input. This pin is the complementary input to Pin
28.
30, 31, 40
DVDD3
I
Power
3.3 V Digital Power Supply.
32
REFB
I
Differential
input
Reference B Input. This internally biased input is typically ac-coupled and, when
configured as such, can accept any differential signal with single-ended swing up
to 3.3 V. If dc-coupled, input can be LVPECL, LVDS, or single-ended CMOS.
33
A
REFB
E
I
Differential
input
Complementary Reference B Input. This pin is the complementary input to Pin 32.
36, 37, 38,
39
M0, M1, M2,
M3
I/O
3.3 V CMOS
(3-level logic
at startup)
Configurable I/O Pins. These pins are 3-level logic at startup and are used for pin
strapping the input and output frequency configuration at startup. Setting
Register 0x0200[0] = 1 changes these pins to 2-level logic and allows these pins
to be used for status and control of the AD9557. These pins have both a 30 k
pull-up resistor and a 30 k pull-down resistor.
EP
VSS
O
Exposed pad
The exposed pad must be connected to ground (VSS).
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