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MAX2745

更新时间： 2024-01-05 20:41:43
品牌 Logo 应用领域
美信 - MAXIM 全球定位系统
页数 文件大小 规格书
9页 411K
描述
Single-Chip Global Positioning System Receiver Front-End

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MAX2745 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：QFP
包装说明：HTFQFP,针数：48
Reach Compliance Code：compliantHTS代码：8542.39.00.01
风险等级：5.83商用集成电路类型：CONSUMER CIRCUIT
JESD-30 代码：S-PQFP-G48JESD-609代码：e3
长度：7 mm湿度敏感等级：3
功能数量：1端子数量：48
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：HTFQFP
封装形状：SQUARE封装形式：FLATPACK, HEAT SINK/SLUG, THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.2 mm最大供电电压 (Vsup)：3.6 V
最小供电电压 (Vsup)：2.4 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：TIN端子形式：GULL WING
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：7 mm
Base Number Matches：1

MAX2745 数据手册

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19-3425; Rev 0; 10/04  
Single-Chip Global Positioning System  
Receiver Front-End  
General Description  
Features  
The MAX2745 complete single-chip global positioning  
system (GPS) RF front-end downconverter utilizes many  
innovative and leading-edge RF CMOS design tech-  
niques. This high-performance, state-of-the-art device  
consumes extremely low power and eliminates the  
need for costly SAW and bulky discrete IF filters. The  
MAX2745 incorporates a fully integrated low-noise  
amplifier (LNA) and mixer, IF section, digital sampler,  
and local oscillator synthesizer. The MAX2745 also pro-  
vides a voltage supply for an external LNA. In addition,  
the MAX2745 features a voltage booster, which can  
extend the power-supply voltage to as low as 1.6V.  
ꢀ Complete Single-Chip GPS Radio for 16.368MHz  
and 32.736MHz Floorplans  
ꢀ Single-Ended or Differential Outputs at 4.092MHz  
ꢀ Low 3.5dB Typical Noise Figure  
ꢀ No External IF SAW or Discrete Filters Required  
ꢀ On-Chip Temperature Sensor  
ꢀ 2.4V to 3.6V Operational Supply Voltage Range  
ꢀ Power Consumption as Low as 41mW at 2.4V  
ꢀ Wide -40°C to +85°C Operational Temperature  
The MAX2745 supports both 3rd overtone crystal  
designs in 32MHz and fundamental frequency crystal  
designs in 16MHz, as well as a TCXO implementation.  
In addition, the MAX2745 incorporates an on-chip tem-  
perature sensor and crystal oscillator with trimmed  
capacitors, resulting in a very accurate frequency and  
additional system cost savings.  
Range  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
The MAX2745 is available in a space-saving 48-pin  
TQFP package and is specified for the extended (-40°C  
to +85°C) temperature range. The power consumption  
of this device is as low as 41mW at 2.4V.  
MAX2745ECM  
-40°C to +85°C  
48 TQFP-EP*  
*EP = Exposed paddle.  
Typical Operating Circuit appears at end of data sheet  
Applications  
In-Vehicle Navigation Systems (IVNSs)  
Block Diagram/  
Pin Configuration  
Location-Based Services (PDAs and  
Accessories)  
Telematics (Vehicle/Asset Tracking and  
Inventory Management)  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
BPF_CTRL  
ODS  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
RBIAS  
CBIAS  
1
2
3
4
5
6
7
8
9
TEMPERATURE  
SENSOR  
VCXO  
Recreational Handheld/Walkie Talkies  
Geographical Information Systems (GISs)  
Emergency Roadside Assistance  
Emergency Response Systems  
Digital Cameras/Camcorders  
MAX2745  
CFS  
V
V
DD  
DD  
BIAS  
COE  
PFD  
DIVIDER  
CHG  
PUMP  
V
GND  
GND  
RFIN  
GND  
DD  
SCLK  
GND  
VSPORT  
LNA/MIXER  
VCO  
Consumer Electronics  
VOUT+  
VOUT-  
V
DD  
BANDPASS FILTER  
AGC  
QUANTIZER  
IEXT_LNA 10  
V
DD  
VOLTAGE  
BOOSTER  
V
11  
12  
26 GND  
DD  
FILTER AUTOMATIC TUNING  
AGC_FIL  
V
DD  
25  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...9

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