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PDF MAX2742 Data sheet ( Hoja de datos )
| Número de pieza | MAX2742 | |
| Descripción | Single-Chip Global Positioning System Receiver Front-End | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3469; Rev 2; 4/08
Single-ChipEVAALVUAAILTAIOBNLEKIT Global Positioning System
Receiver Front-End
General Description
The MAX2742 complete single-chip global positioning
system (GPS) RF front-end utilizes many innovative and
leading-edge RF CMOS design techniques. This high-
performance, state-of-the-art device consumes extreme-
ly low power and eliminates the need for costly SAW
and bulky discrete IF filters. The MAX2742 incorporates
a fully integrated low-noise amplifier (LNA) and mixer, IF
section, digital sampler, and local oscillator synthesizer.
The intended input signal for the MAX2742 is the L1
GPS signal 1.57542GHz. This device supports high-
accuracy output quantization, which delivers the best
performance obtainable for the GPS receiver. The
power consumption of the MAX2742 is as low as 32mW
at a +2.4V supply.
The MAX2742 is available in a space-saving 48-pin
TQFP package and is specified for the extended (-40°C
to +85°C) temperature range.
Applications
In-Vehicle Navigation Systems (IVNS)
Location-Based Services (PDAs and
Accessories)
Recreational Handheld/Walkie Talkies
Geographical Information Systems (GISs)
Telematics (Vehicle, Asset Tracking, and
Inventory Management)
Emergency Roadside Assistance
Emergency Response Systems
Digital Cameras/Camcorders
Consumer Electronics
Features
♦ Complete Single-Chip GPS Front-End Receiver
♦ Single-Ended or Differential Outputs at 1.023MHz
♦ Low 4.5dB Typical Noise Figure
♦ No External IF SAW or Discrete Filters Required
♦ Very Low 32mW Power Consumption at +2.4V
♦ Wide +2.4V to +3.6V Operational Supply Voltage
Range
♦ Extended -40°C to +85°C Temperature Range
Ordering Information
PART
TEMP RANGE
MAX2742ECM
-40°C to +85°C
MAX2742ECM+
-40°C to +85°C
*EP = Exposed paddle.
+Denotes lead-free package.
PIN-PACKAGE
48 TQFP-EP*
48 TQFP-EP*
Block Diagram/
Pin Configuration
48 47 46 45 44 43 42 41 40 39 38 37
RBIAS 1
CBIAS 2
VDD 3
VDD 4
GND 5
GND 6
BIAS
TCXO
BUFFER
MAX2742
CP
PFD
DIV
CONTROL
BLOCK
36 I.C.
35 I.C.
34 I.C.
33 I.C.
32 VDD
31 DIN
RFIN 7
LNA
30 GND
GND 8
29 CLKOUT2
GND 9
28 DOUT
IFSEL 10
I.C. 11
VGA COMP
AGC
27 I.C.
26 CLKOUT1
VDD 12
25 VDD
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 Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Single-Chip Global Positioning System
Receiver Front-End
Pin Description
PIN
1
2
3, 4, 12, 17, 23,
25, 32, 39, 44, 46
5, 6, 8, 9, 13, 24,
30, 38, 42, 45
7
10
11, 21, 22,
27, 33–36, 40
14
15
16
18
19, 20
26
28
29
31
37
41
43
47, 48
—
NAME
RBIAS
CBIAS
VDD
FUNCTION
External Bias Resistor. Connect a 100kΩ ±1% resistor in parallel with a 0.1µF capacitor in
series with a 71kΩ resistor to GND.
External Bias Capacitor. Connect a 0.1µF capacitor to GND.
Supply Voltage. Bypass to GND with 100pF and 100nF capacitors as close to the pin as
possible with the smaller value capacitor closer to the pin.
GND
Ground. Connect to PC board ground plane.
RFIN
IFSEL
LNA Input. Requires external matching network.
IF Output Select. Selects output type. Drive high for single-ended output, drive low for
differential output.
I.C. Internally Connected. Leave unconnected.
DCLK
CLKENB2
CLKENB1
AGCFLT
OUT-, OUT+
CLKOUT1
DOUT
CLKOUT2
DIN
SHDN
VTUNE
CPOUT
XTALIN1,
XTALIN2
EP
Digital Control Clock
Clock Output Enable 2. Drive high to enable limited-swing clock output.
Clock Output Enable 1. Drive high to enable full-swing clock output.
AGC External Filter
Differential Comparator Outputs
Full-Swing Clock Output
Digital Output
Limited-Swing Clock Output
Digital-Control Data Input
Shutdown. Drive SHDN low to disable all device functions. Drive SHDN high for normal
operation.
VCO Tuning Input. Connect directly to the loop filter output.
Charge-Pump Output. Connect directly to the loop filter input.
Crystal Oscillator Input. Connect XTALIN1 and XTALIN2 together and to the TCXO output
through a coupling capacitor.
Exposed Paddle. Internally connected to GND. Connect to PC board ground plane for
optimal performance.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX2742.PDF ] | |
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