AD6402ARS AD [Analog Devices], AD6402ARS Datasheet - Page 5

• Manufacturer Part Number: AD6402ARS
• Description: IF Transceiver Subsystem
• Manufacturer: AD [Analog Devices]

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