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參數(shù)資料
| 型號： | STB4395 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CT2 Receiver/Transmitter(CT2接收器/發(fā)送器) |
| 中文描述： | 第二代無線電話接收器/發(fā)送器（第二代無線電話接收器/發(fā)送器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 153K |
| 代理商： | STB4395 |
5 - POWERSUPPLIES
5.1 - Supplies
The chip operates from a power supply of 3.0 to
5.5 Volts. All interface circuits to the baseband
chipsare operatedbetweenthese supplies.
Six on-chip regulators are included on-chip which
provide to all partsof the circuit separateregulated
voltagesuppliesof -2.85
±
0.15 Voltsrelative to the
top railfortheRF circuitry, theIFcircuitry,thedigital
circuitry and for the three VCO’s.
The chipcanbe operatedin 3modes,powerdown,
receiveand transmit.Power down is activated tak-
ing the Pin EN to V
N
. To transfer to the receive
mode, NTXEN is taken to V
P
.
The built-in regulators can be by-passed ,if so
required.
5.2 - Ground Plane Connections
The chiphasbeendesignedto bedecoupledtothe
positive supply, V
P
,at manypoints. Thereforeit is
strongly recommended that the chip be mounted
on a boardwith a groundplane connectedto V
P
.
Becausethe baseband chip is specifiedrelativeto
a negative ground, it is further recommended that
the board used is a 4 layer board with both a
positive,V
P
, and negative ground plane V
N
. This
has the additional advantage of providing good
high frequencydecoupling between supplies.
The questionas to whetherto call V
P
or V
N
ground
depends on which external equipment is con-
nected. For testing the baseband section, this is
V
N
; for testing the radio chip, this is V
P
. In a
product, thiswill depend on the application.
For clarity all voltages specified in this document
will be specified with respect to the supply, V
P
or
V
N
,that the voltage normally tracks with whenthe
supply is varied.
6 - ELECTRICAL CHARACTERISTICS
Symbol
V
N
V
REG
IRX
ITX
IQ
Parameter
Min.
-3
-2.7
Typ.
Max.
-5.5
-3
40
80
20
Unit
V
V
mA
mA
μ
A
Power Supply Voltage (unregulated)
Power Supply bypassing Internal Regulators (this is also interface supply)
Receive Mode
Transmit Mode
Standby/Power Down
32
68
7 - TIMING INFORMATION
7.1 - Turn on-off Times
Timesare relativeto the NTXEN transition(high to low for receiveto transmitand low to high for transmit
to receive).
Symbol
t
ON
t
RAMPON
t
TXRX
Parameter
Min.
Typ.
Max.
10
27.78
27.78
Unit
μ
s
μ
s
μ
s
Turn-on Time From standby to receive
PA Power Ramp up to reach -3dB of final power
Switchover Time Transmit to Receive (LNA/first mixer active)
7.2 - Channel SelectTiming
PRGCLK must be high beforeNPRGEN goes low to programmethe synthesizer.
Figure 2 :
Timingof Serial Programming Data
NPRGEN
PRGCLK
PRGD
PROGRAM
CODE
Order of NPRGEN &PRGD unimportant
Code changes on Rising Edge ofNPRGEN
4
Note thatalthoughanewprogramcodeis implementedon the rising edgeofthe NPRGEN, thetransmitted
power levelis delayeduntil at the start of the nextburst of transmission.In orderto changetransmitpower
during a conversation,the required powercode mustbe seriallyloadedwith the power change instruction.
STB4395
9/16
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