Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

AD6402 Datenblatt(PDF) 7 Page - Analog Devices

Teilenummer AD6402
Bauteilbeschribung  IF Transceiver Subsystem
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD6402 Datenblatt(HTML) 7 Page - Analog Devices

  AD6402 Datasheet HTML 1Page - Analog Devices AD6402 Datasheet HTML 2Page - Analog Devices AD6402 Datasheet HTML 3Page - Analog Devices AD6402 Datasheet HTML 4Page - Analog Devices AD6402 Datasheet HTML 5Page - Analog Devices AD6402 Datasheet HTML 6Page - Analog Devices AD6402 Datasheet HTML 7Page - Analog Devices AD6402 Datasheet HTML 8Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 7 / 8 page
background image
AD6402
–7–
REV. 0
supply current levels when not allocated to an active transmit or
receive timeslot in a TDMA system.. The respective transmit
and receive blocks can be turned on only as needed thereby
reducing power consumption and extending battery life of
handheld terminals.
The component selection in Figure 5 is explained as follows:
The IF input is driven from the output of a SAW filter via an
impedance matching circuit as shown. This matching minimizes
the insertion loss of the filter and follows the filter manufactur-
ers recommendations. The tank circuit shown uses two varactor
diodes. One diode (D3) is biased by the output of the IF PLL
loop filter and ensures that the IF VCO frequency is correctly
centered. The second diode is provided to enable a modulation
signal, which is generated at the output of the on-chip op amp
(MODOUT), to be coupled into the VCO tank and thereby
implement a modulation of the VCO frequency. In the case of
DECT, the IF VCO control loop is opened while the VCO is
being modulated by the transmit bit stream. The loop is opened
by tri-stating the output of the IF VCO PLL charge pump.
The exact component values used around the modulation am-
plifier will be determined by the amount of attenuation required
for suppression of baseband transmit spurii and images. These
artifacts are usually present if the baseband FSK signal is gener-
ated by a ROMDAC. In most instances a second or third order
Bessel or Butterworth filter will be required.
A capacitor to ground is required to be connected to COFF.
This capacitor stores the demodulator charge-pump voltage
required to lock the demodulator VCO to the reference fre-
quency. The dynamic response of the demodulator loop is con-
trolled by selection of the values for C45 and R22 which are
connected in series to CFILT. These components determine the
IFVCC1
IFVCC2
DOUT
DFILP
C71
1nF
C44
100nF
VRF
CP
REG
REF
CP
/3,/5
PD
RSSI
PLLOUT
PLLVCC
PLLGND
REXT
CFILT
REFSEL
FMMOD2
FMMOD1
MODOUT
TXOUTB
TXOUT
CTL1
CTL2
CTL3
VCOGND
VCO
SLREF
VREG
VBAT
IFGND
IFIN
COFF
REFIN
C30
150pF
R16
330
C28
1nF
C29
1nF
L11
39nH
C41
8pF
C42
47pF
R26
1.2k
C50
4.7nF
C25
1nF
R21
240
D2
D3
C43
100nF
VIF
C44
1nF
VCC
12pF
C10
1nF
L7
100nH
L6
150nH
10
9
8
7
6
1
2
3
4
5
L5
150nH
C69
1nF
CP
C52
100pF
R28
330
C51
180pF
R32
330
R70
C32
100nF
C45
131nF
R22
330
C13
1nF
C31
R17
10k
C11
100pF
VRF
R10
2k
R9
1k
C14
68pF
C12
33pF
R30
2k
C58
47pF
RXBB
RSSI
C4
3.3nF
R8
4.7k
AD6402
SMV
1204-37
SMV
1204-36
TXIF–
TXIF+
IFC0
IFC1
IFC2
VREF
VTUNE
B4535
IFIN
TXBB
R35
4.7k
RCLK
Figure 5. Application Circuit for DECT GFSK Transceiver
transfer characteristic of the loop filter and hence the lock time,
settling time and bandwidth of the loop. REXT should use the
recommended value as shown.
Finally, the demodulator is followed by a voltage follower,
which is configured as a data filter. This data filter is used to
bandlimit the FM noise generated in the demodulator. It also
attenuates undesired adjacent channel interferers. The compo-
nent values chosen will be a trade-off between the amount of
band limiting required and attenuation of the in-band desired
signal.
DECT Application Circuit Notes (Figure 5)
1. Signal Description
VRF: Regulated Supply Voltage; Nominal Value 2.85 V.
VCC: Unregulated battery voltage; 3.1 V–4.5 V
VTUNE: Synthesizer Control Voltage; Range dependent on
loop filter and synth charge pump compliance.
TXBB: Baseband transmit modulation voltage; typically
SLREF
±0.7 V
RCLK: Reference clock for PLL demodulator; 13.824 MHz
(2nd IF frequency = (N/M)
× Frclk where N = 3 or 5, and
M = 2. Maximum 2nd IF = c.26 MHz)
2. Typical IF input sensitivity referred to the input of SAW
filter for the above application will be –72 dBm.
3. TxBB filter is user configurable. In the above application, the
filter is implemented to remove images generated by ROM
DAC baseband signal generators. Other implementations are
possible including passive pulse shaping circuits which elimi-
nate the need for such filtering.


Ähnliche Teilenummer - AD6402

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Analog Devices
AD6402 AD-AD6402_15 Datasheet
105Kb / 8P
   IF Transceiver Subsystem
REV. 0
More results

Ähnliche Beschreibung - AD6402

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Analog Devices
AD6402 AD-AD6402_15 Datasheet
105Kb / 8P
   IF Transceiver Subsystem
REV. 0
AD6432 AD-AD6432 Datasheet
334Kb / 20P
   GSM 3 V Transceiver IF Subsystem
REV. 0
AD9870 AD-AD9870 Datasheet
233Kb / 20P
   IF Digitizing Subsystem
REV. 0
AD9874 AD-AD9874_17 Datasheet
710Kb / 41P
   IF Digitizing Subsystem
AD6140 AD-AD6140 Datasheet
109Kb / 8P
   Bandpass IF Subsystem
REV. 0
AD9864 AD-AD9864 Datasheet
1Mb / 44P
   IF Digitizing Subsystem
REV. 0
AD9874-EB AD-AD9874-EB Datasheet
580Kb / 40P
   IF Digitizing Subsystem
REV. A
AD6140 AD-AD6140_15 Datasheet
129Kb / 8P
   Bandpass IF Subsystem
REV. 0
AD9870 AD-AD9870_15 Datasheet
226Kb / 20P
   IF Digitizing Subsystem
REV. 0
AD9864 AD-AD9864_15 Datasheet
944Kb / 44P
   IF Digitizing Subsystem
REV. 0
More results


Html Pages

1 2 3 4 5 6 7 8


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com