AD6402 Просмотр технического описания (PDF) - Analog Devices
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AD6402 Datasheet PDF : 8 Pages
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AD6402
Table I. Power Management Functionality
PLL
PLL
PLL
TL1
CTL2 CTL3 BIAS LOCK DMOD REF
REG
RX
VCO
MODE
0
0
0
–
–
–
OFF
OFF
–
–
SLEEP
0
0
1
–
–
–
OFF
ON
–
–
STANDBY
0
1
0
ON
ON
OFF
ON
ON
OFF
ON
RXLOCK
1
X
0
ON
OFF
ON
ON
ON
ON
ON
RXDMOD
1
0
1
OFF
OFF
OFF
ON
ON
OFF
ON
TRANSMIT
1
1
1
ON
ON
OFF
ON
ON
ON
ON
RXLOCKP
OBSOLETE The AD6402 has six operating modes: SLEEP, STANDBY,
RXLOCK, RXDMOD, TRANSMIT and RXLOCKP. These
are summarized in Table I. The blocks referred to in Table I are
shown also in Figure 4. These modes are described as follows:
SLEEP:
The entire device is shut down.
STANDBY: All functions except the regulator are shut down.
RXLOCK:
The device locks to a local reference clock using
the lock PLL. The lock charge pump and divid-
ers are powered up. The VCO is also powered up.
RXDMOD: In this mode the lock charge pump and loop
dividers are shut down. The receive mixer, IF strip,
reference and demodulator are powered up.
TRANSMIT: This mode enables the VCO and transmit op
amp. The reference and regulator are also enabled.
RXLOCKP: This mode may be used in a “prior to” timeslot,
i.e., the slot before the actual active receive
IFIN
IFGND
VBAT
VREG
SLREF
VCO
VCOGND
CTL3
CTL2
CTL1
IFVCC1
IFVCC2
RX
RSSI
DOUT
PLL DMOD
DFLIP
REG
REG
REF
REF
PLL BIAS
PLLOUT
PLLVCC
PLLGND
REXT
CP
CFILT
COFF
PLL LOCK
/3,/5
CP
PD
/2
REFIN
REFSEL
timeslot. In this mode, after lock has been
VCO
FMMOD2
achieved in the RXLOCK mode, the receive
TXOUT
mixer, VCO and IF strip may then be indepen-
FMMOD1
TXOUTB
dently powered up from the demodulator loop.
This can result is power savings, since the de-
MODOUT
modulator may be powered down during the
IF VCO lock acquisition time.
Figure 2. Power Management Scheme
REV. 0
–5–
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