MAX2769B中文版手册

Max2769

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MAX2769B

通用型GPS接收机

__________________________________________________________________ Maxim Integrated Products 1

原理框图

19-5875; Rev 1; 8/11

定购信息在数据资料的最后给出。

相关型号以及配合该器件使用的推荐产品，请参见：china.maxim-ic.

com/MAX2769B.related。

备有评估板

本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。

有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，

或访问Maxim的中文网站：china.maxim-ic.com。

概述

MAX2769B是下一代单芯片全球导航卫星系统(GNSS)接收

机，用于GPS、GLONASS、伽利略以及北斗导航卫星系统。

这款单转换GNSS接收机适合高性能工业和汽车应用。

MAX2769B采用Maxim先进的低功耗SiGe BiCMOS工艺，

能够以较低的成本提供业界最高的性能和集成度。单芯片

内集成了完整的接收链路，包括双输入LNA、混频器、镜

频抑制滤波器、PGA、VCO、N分频频率合成器、晶体振

荡器和多位ADC。该接收器的总噪声系数低至1.4dB。

MAX2769B集成了单芯片滤波器，无需外部IF滤波器，仅需

少量外部元件即可构建完整的低成本GPS RF接收机方案。

MAX2769B是目前设计最为灵活的一款接收机。片内

N分频合成器可以在主机系统所提供的任意参考频率或

晶振频率下，以

30Hz (f

XTAL

= 32MHz)的精度设置IF频

率。ADC可以同时为I和Q通道各输出一位或两位量化值的

CMOS逻辑电平，或者为I通道输出三位量化值的CMOS逻

辑电平。也可以提供I和Q通道的模拟输出。

MAX2769B采用带裸焊盘的5mm x 5mm、28引脚薄型

QFN封装。

应用

汽车导航系统

本地使能移动电话

PND (个人导航设备)

远程信息处理(物品跟踪、库存管理)

舰艇/航空导航系统

软件GPS

笔记本电脑和上网本

特性

S 符合AEC-Q100汽车认证

GPS/GLONASS/伽利略/北斗系统

40pF输出时钟驱动能力

无需外部IF SAW或分立式滤波器

可编程设置IF频率

集成VCO的N分频频率合成器支持宽范围的参考时钟频率

内部独立的双输入LNA分别用于无源和有源天线输入

总噪声系数1.4dB

内置晶体振荡器

内置有源天线传感器

供电电压为2.7V至3.3V

小尺寸28引脚、符合RoHS标准的薄型QFN无铅封装

(5mm x 5mm)

LNAOUT

CC_RF

MIXIN

ANTFLAG

CLKOUT

XTAL

LNA2

PGM

LNA1

CPOUT

CC_VCO

SCLK

ANTBIAS

CC_ADC

N.C.

SDATA

CC_CP

CC_IF

CCD

19 17 16

3 5

4 6

N.C.

SHDN

ADC

FILTER

PLL

LNA2

LNA1

VCO

900

3-WIRE

INTERFACE

IDLE

MAX2769B

_________________________________________________________________ Maxim Integrated Products 2

MAX2769B

通用型GPS接收机

CC_

to Ground .................................................... -0.3V to +4.2V

Other Pins Except LNA_, MIXIN, XTAL, and LNAOUT to

Ground............................. -0.3V to +(Operating V

CC_

+ 0.3V)

Maximum RF Input Power ............................................. +15dBm

Continuous Power Dissipation (T

= +70NC)

TQFN (derates 27mW/NC above +70NC) ...................2500mW

Operating Temperature Range .......................... -40NC to +85NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-

tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS

(MAX2769B EV kit, V

CC_

= 2.7V to 3.3V, T

= -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. Typical

values are at V

CC_

= 2.85V and T

= +25NC, unless otherwise noted.) (Note 1)

Idle Mode是Maxim Integrated Products, Inc.的商标。

CAUTION! ESD SENSITIVE DEVICE

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage 2.7 2.85 3.3 V

Supply Current

Default mode, LNA1 is active (Note 2) 18 27 31

mADefault mode, LNA2 is active (Note 2) 15 25 30.5

Idle ModeK, IDLE = low, SHDN = high

Shutdown mode, SHDN = low

200 FA

Voltage Drop at ANTBIAS from

CC_RF

Sourcing 20mA at ANTBIAS 0.2 V

Short-Circuit Protection Current at

ANTBIAS

ANTBIAS is shorted to ground 57 mA

Active Antenna Detection Current To assert logic-high at ANTFLAG 1.1 mA

DIGITAL INPUT AND OUTPUT

Digital Input Logic-High

Measure at the SHDN pin

1.5 V

Digital Input Logic-Low

Measure at the SHDN pin

0.4 V

本数据资料中如有与电气特性表中参数(最小值、典型值、最大值)不一致的引用，请以电气特性表中的数据为准。

_________________________________________________________________ Maxim Integrated Products 4

MAX2769B

通用型GPS接收机

AC ELECTRICAL CHARACTERISTICS* (continued)

(MAX2769B EV kit, V

CC_

= 2.7V to 3.3V, T

= -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA

input is driven from a 50I source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set

to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kI||7.5pF on each pin. Typical

values are at V

CC_

= 2.85V and T

= +25NC, unless otherwise noted.) (Note 1)

Note 1: MAX2769B is production tested at T

= +25NC and +85NC. All min/max specifications are guaranteed by design and char-

acterization from -40NC to +85NC, unless otherwise noted. Default register settings are not production tested or guaran-

teed. User must program the registers upon power-up.

Note 2: Default, low-NF mode of the IC. LNA choice is gated by the ANT_FLAG signal. In the normal mode of operation without an

active antenna, LNA1 is active. If an active antenna is connected and ANT_FLAG switches to 1, LNA1 is automatically dis-

abled and LNA2 becomes active. PLL is in an integer-N mode with f

COMP

= f

TCXO

/16 = 1.023MHz and ICP = 0.5mA. The

complex IF filter is configured as a 5th-order Butterworth filter with a center frequency of 4MHz and bandwidth of 2.5MHz.

Output data is in a 2-bit sign/magnitude format at CMOS logic levels in the I channel only.

Note 3: The LNA output connects to the mixer input without a SAW filter between them.

Note 4: Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz at -60dBm/

tone. Passive pole at the mixer output is programmed to be 13MHz.

Note 5: Measured from the LNA input to the LNA output. Two tones are located at 12MHz and 24MHz offset frequencies from the

GPS center frequency of 1575.42MHz at -60dBm per tone.

PARAMETER CONDITIONS MIN TYP MAX UNITS

LNA2 INPUT

Power Gain 13 dB

Noise Figure 1.14 dB

Input IP3 (Note 5) 1 dBm

Output Return Loss 19 dB

Input Return Loss 11 dB

FREQUENCY SYNTHESIZER

LO Frequency Range 0.2V < V

TUNE

< (V

CC_

- 0.3V) 1550 1610 MHz

LO Tuning Gain 57 MHz/V

Reference Input Frequency 8 44 MHz

Main Divider Ratio 36 32,767 —

Reference Divider Ratio 1 1023 —

Charge-Pump Current

ICP = 0 0.5

ICP = 1 1

TCXO INPUT BUFFER/OUTPUT CLOCK BUFFER

Frequency Range 8 32 MHz

Output Logic-Level High (V

) With respect to ground, I

= 10FA (DC-coupled) 2 V

Output Logic-Level Low (V

) With respect to ground, I

= 10FA (DC-coupled) 0.8 V

Capacitive Slew Current

Load = 10kW + 40pF, f

CLKOUT

= 32MHz

11 mA

Output Load 10||40 kI||pF

Reference Input Level Sine wave 0.5 V

P-P

Clock Output Multiply/Divide

Range

/4, /2, /1

(x2, max input frequency of 16MHz)

÷4 x2 —

ADC

ADC Differential Nonlinearity AGC enabled, 3-bit output Q0.1 LSB

ADC Integral Nonlinearity AGC enabled, 3-bit output Q0.1 LSB

本数据资料中如有与电气特性表中参数(最小值、典型值、最大值)不一致的引用，请以电气特性表中的数据为准。

剩余24页未读，继续阅读

zhengxinaisdn

2014-10-20

很好，终于可以对照着英文版看懂了！

daijinruisdu

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