收藏本站
SY87729/39L
Micrel, Inc.
EVALUATION BOARD SCHEMATICS
Figure 19 is the schematic for the SY87729/39L evaluation
board. U1 is the device being highlighted. The LVPECL
input is DC coupled and terminated via R3, R4, R5 and C6.
This network biases R5 at about 1.3V. Thus, the LVPECL
source driving J3 and J4 sees 50 ? (AC via C6) to about
V CC – 2.0V. The output is AC coupled. R12 and R13 provide
a DC path to ground for the CLKOUT+ and CLKOUT –
LVPELC outputs, while C4 and C5 form the DC block. U3 is
a crystal oscillator that provides differential LVPECL outputs
directly. To use this frequency source, connect J7 to J3 and
J8 to J4.
Evaluation Board
U2, a 5V tolerant buffer, interfaces the SY87729/39L
evaluation board to the printer port. When not plugged in,
R9 disables the outputs of U2A, allowing R6, R7, and R8 to
pull down and disable U1 ’ s programming interface. When
J9 pin 4 is low, U2A is enabled, U1 pin 6 is set active high,
and the software on the PC can toggle PROGDI and
PROGSK to effect a configuration download.
The interface always sees the state of U1 ’ s LOCKED
pin. Also, one bit from the output, bit 4 (pin 5), is inverted
and sent back to an input on the Centronics interface (pin
11). This is how the applications software determines
whether or not an SY87729/39L evaluation board is attached
to the parallel port.
V CC
Note:
J3
SMA
Note:
Ground relief,
no need for 50 ? ,
keep near device
C2
100nF
R1
2k ?
R2
2k ?
C3
100nF
Ferrite Bead
C7 C1
0.1 μ F 22 μ F
L1 In-Line
J1
1
VCC
J2
1
GND
REFCLK+
J4
SMA
REFCLK —
C8
0.1 μ F
V CC
32 31 30 29 28 27 26 25
V CC
C4
100nF
R14
DNI
J5
SMA
CLKOUT+
SY87729/39L
Note:
C6
0.1 μ F
R3
51.1 ?
R4
51.1 ?
1
2
3
4
5
6
7
VCCA VCCA
NC NC
REFCLK+ CLKOUT+
REFCLK — U1 CLKOUT —
NC NC
PROGCS NC
PROGDI VCCO
24
23
22
21
20
19
18
C5
100nF
R15
DNI
J6
SMA
CLKOUT —
These four
8
PROGSK
VCC
17
components
in fly-by
configuration
R5
51.1 ?
R6
10k ?
R7
10k ?
R8
10k ?
9 10 11 12 13 14 15 16
C10
0.1 μ F
C11
0.1 μ F
C12
0.1 μ F
R12
121 ?
R13
121 ?
C9
0.1 μ F
V CC
19
20
21
22
23
1
2
3
4
5
V CC
R9
2.21k ?
2
4
6
8
U2A
74LCX240
A1 Y1
A2 Y2
A3 Y3
A4 Y4
18
16
14
12
PROGSK
PROGDI
PROGCS
Note:
R12 and R13 near U1
U3
Saronix SEL2431C
J7
SMA
XTAL —
24
25
26
27
28
29
30
6
7
8
9
10
11
12
1
G
U2B
Note:
Insert for SY87729L only
V CC
1
7
/CK
GND
VCC
CK
14
8
J8
SMA
XTAL+
31
32
33
34
35
36
13
14
15
16
17
18
V CC
V CC
9
7
5
3
74LCX240
Y1 A1
Y2 A2
Y3 A3
Y4 A4
G
11
13
15
17
19
R10
2.21k ?
R11
475 ?
J9
Connector Cent36
C13
0.1 μ F
C14
0.1 μ F
Note:
Note:
R14 and R15 in-line
Insert for SY87739L only
Figure 19. SY87729/39L Evaluation Board Schematic
for back termination
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
11
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
T10C360BF THYRISTOR TVS 360V 100A 3PIN RDL
T12-211SNR-1 CIRCUIT BRKR THERMAL 1A 1POLE
T13-212R-0.5 CIRCUIT BRKR THERMAL 500MA 1POLE
T21-A230X SURGE ARRESTER 230V GASTUBE 3PIN
T23-A230X SURGE ARRESTER 230V GASTUBE 3PIN
T23-A350X SURGE ARRESTER 350V GASTUBE 3PIN
T26-2-7.00A-27720-1 CIRCUIT BREAKER 3P 7A 50V CUSTOM
T63-C650X SURGE ARRESTER 550-800V GASTUBE
相关代理商/技术参数
SY87729LHITR 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER
SY87729LHY 功能描述:时钟合成器/抖动清除器 3.3V Fractional N Synthesizer (10MHz to 365MHz) (Lead Free/I Temp/32 pin TQFP) RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel
SY87729LHY TR 功能描述:时钟合成器/抖动清除器 3.3V Fractional N Synthesizer (10MHz to 365MHz) (Lead Free/I Temp/32 pin TQFP) RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel
SY87729LHYTR 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V AnyClock (10MHz to 365MHz) FRACTIONAL N SYNTHESIZER
SY87739L 制造商:未知厂家 制造商全称:未知厂家 功能描述:Protocol Transparent 3.3V 10MHz to 729MHz Fractional-N Synthesizer
SY87739L_07 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:PROTOCOL TRANSPARENT 3.3V 10MHz to 729MHz FRACTIONAL-N SYNTHESIZER
SY87739L_11 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Protocol Transparent, 3.3V, 10MHz to 729MHz, Fractional-N Synthesizer
SY87739LHG 功能描述:IC SYNTHESIZER FRACT 3.3V 32TQFP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:AnyClock® 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT