HFA3783 Datasheet, PDF (16/34 Pages) Intersil Corporation – I/Q Modulator/Demodulator and Synthesizer

HFA3783
BUFFER
LPF
CM
VOLTAGE
Bit C<11>
RXI+
PIN 38
RXI-
PIN 37
IDAC
IDAC
8
COMP
SAR
8
CONTROL
COMP
AUTO BAL.
LPF
BUFFER
CAL CLK
CM
VOLTAGE
BIT C<11>
CAL_EN
PIN 42
BITS C<0:6>
CAL
COUNTER
REF_IN
PIN 14
FIGURE 2. DC OFFSET CALIBRATION BLOCK DIAGRAM
RXQ+
PIN 36
RXQ-
PIN 35
CAL_EN
(CAL CLK)
REF/C
REF/2C
CALIBRATION STARTS AT NEXT RISE TIME OF (REF/COUNTER) SETTING FROM THE SERIAL INTERFACE
ALLOCATED SETTLING TIME
AGC AMP ON-BASEBAND NATURAL
OFFSET IF CAL_EN IS LOW
CALIBRATE COMPARATORS
1
2
3
5
4
AGC AMP TURNED OFF IN RX MODE
AGC AMP ON
CALIBRATED OFFSET AT BASEBAND
67
8
FIGURE 3. DC OFFSET CALIBRATION TIMING DIAGRAM
16