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LT8900 Datasheet

Low Cost 2.4GHz Radio Transceiver


LT8900 Datasheet Preview


LT8900 Datasheet Revision 1.2
LT8900
Low Cost 2.4GHz Radio Transceiver
FEATURES
GENERAL DESCRIPTION
z Complete 2.4 GHz radio transceiver includes
fully integrated RF PLL and channel filtering
z Supports Frequency-Hopping Spread
Spectrum
z Supports SPI and I2C bus interface
z Built-in smart auto-acknowledge Tx/Rx
protocol simplifies usage
z Packet data rate 1 Mbps over-the-air
z FIFO flag signal permits continuous streaming
data at 1 Mbps over-the-air
z Power management for minimizing current
consumption
z Digital readout of RSSI and temperature
z Lead-free 4x4mm QFN Package & SOP16
for best RF performance
Application
z Remote controls
z Wireless keyboards and mice
z Proprietary Wireless Networks
z Home automation
z Commercial and industrial short-range
wireless
z Wireless voice, VoIP, Cordless headsets
z Robotics and machine connectivity
The LT8900 is a low-cost, fully
integrated CMOS RF transceiver, GFSK data
modem, and packet framer, optimized for use in the 2.4
GHz ISM band. It contains transmit, receive, RF
synthesizer, and digital modem functions, with few
external components. The transmitter supports digital
power control. The receiver utilizes extensive digital
processing for excellent overall performance, even in
the presence of interference and transmitter
impairments.
The LT8900 transmits GFSK data at approximately 1
dBm output power. The low-IF receiver architecture
produces good selectivity, with sensitivity down to
approx. -87 dBm. Digital RSSI values are available to
monitor channel quality.
On-chip transmit and receive FIFO registers are
available to buffer the data transfer with MCU.
Over-the-air data rate is always 1 Mbps even
when connected to a slow, low-cost MCU.
Built-in CRC, FEC, data whitening, and automatic
retry/acknowledge are all available to simplify and
optimize performance for individual applications.
The digital baseband interface can be either 4-wire SPI
or 2-wire I2C-bus. Three additional pins are available
for optional reset and buffer control.
For extended battery life, power consumption is
minimized all key areas. A sleep mode is available to
reduce standby current consumption to just 1 uA
typ. while preserving register settings.
This product is available in RoHS compliant 24-lead
4x4 mm JEDEC standard QFN package, featuring an
exposed pad on the bottom for best RF characteristics.
Also available in bare die form.
Free Datasheet http://www.datasheet4u.com/
Page 1

1. Block Diagram
LT8900 Datasheet Revision 1.2
Page 2
December
2010
Free Datasheet http://www.datasheet4u.com/
Page 2

2. Absolute Maximum Ratings
LT8900 Datasheet Revision 1.2
Table 1. Absolute Maximum Rating
Parameter
Operating Temp.
Storage Temp.
LDO_VDD, VDD_IO Voltage
VDD pins
Applied Voltages to
Other Pins
Input RF Level
Output Load mismatch (Z0=50)
Symbol
TOP
TSTORAGE
VIN_MAX
VDD_MAX
VOTHER
PIN
VSWROUT
MIN TYP MAX
-40 +85
-55 +125
+3.7
+2.5
-0.3 +3.7
+10
10:1
Unit
ºC
ºC
VDC
VDC
dBm
VSWR
Notes:
1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Recommended operating conditions
indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For
guaranteed specifications and test conditions, see the Electrical Characteristics section below.
2. These devices are electro-static sensitive. Devices should be transported and stored in anti-static containers. Equipment and
personnel contacting the devices need to be properly grounded. Cover workbenches with grounded conductive mats.
Page 3
December
2010
Free Datasheet http://www.datasheet4u.com/
Page 3

3. Electrical Characteristics
LT8900 Datasheet Revision 1.2
Table 2. Electrical Characteristics
The following specifications are guaranteed for TA = 25 C, LDO_VDD= VDD_IO = 3.3 VDC, unless otherwise noted.
Parameter
Symbol
MIN
TYP MAX
Units
Test Condition and Notes
Supply Voltage
DC power supply voltage range
Current Consumption
Current Consumption - TX
Current Consumption - RX
Current Consumption –IDLE
Current Consumption - SLEEP
Digital Inputs
Logic input high
Logic input low
Input Capacitance
Input Leakage Current
Digital Outputs
Logic output high
Logic output low
Output Capacitance
Output Leakage Current
Rise/Fall Time (SPI)
Clock Signals
CLK rise, fall time (SPI)
CLK frequency range (SPI)
Overall Transceiver
Operating Frequency Range
Antenna port mismatch
(Z0=50)
IDD_TXH
IDD_TXL
IDD_RX
IDD_IDLE1
IDD_IDLE2
IDD_SLP
VIH
VIL
C_IN
I_LEAK_IN
VOH
VOL
C_OUT
I_LEAK_OUT
T_RISE_OUT
Tr_spi
FSPI
F_OP
VSWR_I
VSWR_O
1.9
0.8
VDD_IN
0
0.8
VDD_IN
0
2400
18
12
17
1.4
1.1
1
12
<2:1
<2:1
3.6
VDC`
Input to VDD_IO and LDO_VDD
pins.
mA POUT = high power setting
mA POUT = low power setting
mA
mA
Configured for BRCLK output
running.
mA Configured for BRCLK output OFF.
uA
1.2
VDD_IN
0.8
10
10
V
V
pF
uA
VDD_IN V
0.4 V
10 pF
10 uA
5 nS
25
nS
Requirement for error-free register
reading, writing.
MHz
2482
MHz
VSWR
VSWR
Receive mode.
Transmit mode.
Page 4
December
2010
Free Datasheet http://www.datasheet4u.com/
Page 4
Part Number LT8900
Manufactur ETC
Description Low Cost 2.4GHz Radio Transceiver
Total Page 43 Pages
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