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参数资料
| 型号： | LTC6946IUFD-3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/30页 |
| 文件大小： | 0K |
| 描述： | IC INTEGER-N PLL W/VCO 28-QFN |
| 软件下载： | PLLWizard™ PLLWizard™, with .NET 2.0 installer |
| 标准包装： | 73 |
| 类型： | 时钟/频率合成器（RF/IF），分数-N，整数-N， |
| PLL： | 是 |
| 输入： | 时钟 |
| 输出： | 时钟 |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 5.79GHz |
| 除法器/乘法器： | 是/是 |
| 电源电压： | 3.15 V ~ 5.25 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x5） |
| 包装： | 管件 |
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LTC6946
12
6946fa
BLOCK DIAGRAM
RF–
28
2
3
11
GND
10
MUTE
9
RF+
12
VRF
+
13
27
REF–
REFO
≤250MHz
≤100MHz
÷1 TO 1023
÷1 TO 6, 50%
÷32 TO 65535
0.373GHz TO
5.79GHz
MUTE
1
VREFO
+
REF+
26
VREF
+
R_DIV
LOCK
PFD
O_DIV
N_DIV
B_DIV
CAL, ALC
CONTROL
2.24GHz TO 3.74GHz (LTC6946-1) OR
3.08GHz TO 4.91GHz (LTC6946-2) OR
3.84GHz TO 5.79GHz (LTC6946-3)
TUNE
15
CP
VVCO
+
GND
CMA
CMB
CMC
GND
250μA TO
11.2mA
25
22
21
20
19
18
17
24
VCP
+
23
GND
16
TB
6946 BD
14
BB
SERIAL
PORT
STAT
CS
7
SDO
SDI
SCLK
8
VD
+
6
5
4
OPERATION
The LTC6946 is a high performance PLL complete with
a low noise VCO available in three different frequency
range options. The output frequency range may be further
extended by utilizing the output divider (see Available Op-
tions table, for more details). The device is able to achieve
superior integrated phase noise by the combination of
its extremely low in-band phase noise performance and
excellent VCO noise characteristics.
REFERENCE INPUT BUFFER
The PLL’s reference frequency is applied differentially on
pins REF+ and REF–. These high impedance inputs are
self-biased and must be AC-coupled with 470pF capacitors
(see Figure 1 for a simplified schematic). Alternatively, the
inputs may be used single ended by applying the refer-
ence frequency at REF+ and bypassing REF– to GND with
a 470pF capacitor.
A high quality signal must be applied to the REF± inputs as
they provide the frequency reference to the entire PLL. To
achieve the part’s in-band phase noise performance, apply
27
28
4.2k
REF+
REF–
4.2k
6946 F01
1.9V
BST
BIAS
VREF
+
VREF
+
LOWPASS
FILT[1:0]
Figure 1. Simplified REF Interface Schematic
a CW signal of at least 6dBm into 50Ω, or a square wave
of at least 0.5VP-P with slew rate of at least 40V/μs.
Additional options are available through serial port register
h08 to further refine the application. Bits FILT[1:0] control
the reference input buffer’s lowpass filter, and should be
set based upon fREF to limit the reference’s wideband
noise. The FILT[1:0] bits must be set correctly to reach
the LM(NORM) normalized in-band phase noise floor. See
Table 1 for recommended settings.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6946-x | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 20Msps Low Noise Dual ADC |
| LTC694C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC694C-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3V Microprocessor Supervisory Circuits |
| LTC694CN-3.3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor |
| LTC694CN8 | 功能描述:IC MPU SUPERVISORY CIRCUIT 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
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