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SX1781 Datasheet Preview

SX1781 Datasheet

PLL Frequency Synthesizer

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SX1781
PLL Frequency Synthesizer with Integrated VCO
ADVANCED COMMUNICATIONS & SENSING
FINAL
DATASHEET
GENERAL DESCRIPTION
The SX1781 is a high-performance low phase noise
integer-N frequency synthesizer for wireless
communications applications. The circuit embeds a
fully integrated PLL (including VCO tank and loop
filter), complementary output buffers The divider and
power-down settings are programmable via an SPI
interface. A Lock Detector pin linked to a squelch
function have been designed to ease the software
development.
PIN DIAGRAM
FEATURES
Frequency range:1200 to 1400 MHz
Frequency step: 250 kHz min.
Phase noise: -85 dBc/Hz @ 10 kHz offset
Reference spurs: -67 dBc
Hopping time: 350 µs max.
Operating voltage: 3.0 - 3.6V
Programmable Output Power: up to +5 dBm
Integrated VCO and loop filter
SPI-bus interface
Lock Detect output and squelch
Ultra-low power sleep mode
Complementary RF outputs
Temperature range: -40 to +85°C
4 x 4 mm MLPQ16 package
Pb-free and RoHS compliant
ORDERING INFORMATION
Part Number Delivery Quantity
SX1781IMLTRT Tape & Reel 3000 pces
BLOCK DIAGRAM
CSB SCK MOSI MISO
VDDA VDDD VDDF
CLK
÷[RDiv+1]
PFD
Loop
Filter
VCO
÷2
SLEEPB
Rev 1 - November 2008
©2008 Semtech Corp.
÷ [N Div+4800]
VSSA VSSD VSSF
Page 1
Out_P
Out_N
LD
www.semtech.com




Semtech

SX1781 Datasheet Preview

SX1781 Datasheet

PLL Frequency Synthesizer

No Preview Available !

SX1781
PLL Frequency Synthesizer with integrated VCO
ADVANCED COMMUNICATIONS & SENSING
FINAL
DATASHEET
1. Pin Description
Table 1 Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
VDDD
CLK
NC
VSSD
CSB
MOSI
MISO
SCK
VSSA
Out_N
Out_P
VDDA
VSSF
VDDF
SLEEPB
LD
Pin Type
I
I
I
O
I
O
O
I
O
Description
Power Supply
PLL Reference Signal
Do not Connect
Ground
SPI Line Select
SPI Data Input
SPI Data Output (High Z when unused)
SPI Clock
Ground
RF Complementary Output
RF Output
Power Supply, Output Buffers
Ground
Power Supply
When low, the circuit is in deep sleep mode
PLL Lock Detect Output (active high)
Note: the thermal pad under the SX1781 should be connected to ground for an optimal thermal dissipation.
Rev 1 - November 2008
©2008 Semtech Corp.
Page 2
www.semtech.com


Part Number SX1781
Description PLL Frequency Synthesizer
Maker Semtech
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