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ISL5239
The IF converter frequency response is as shown in
Figure 7, with the folding effect shown in Figure 7A for the
x2, Fs/4 upconverter case.
IFC FILTER RESPONSE (x2 MODE)
0
-20
-40
-60
-80
-100
-120
Correction Filter (CF)
To compensate for imperfections in the analog filtering which
takes place after D/A conversion, the correction filter
provides an independent 13-tap FIR filter on each channel.
These filters may be programmed to remove differential
group delay and ripple characteristics of external analog
circuits including sin(x)/x correction and frequency response
imbalance between the I and Q channels using either
amplitude or group delay. This allows for correction of the
two physically separate I and Q analog response paths from
the DAC’s through the quadrature up-converter. It also
provides correction of the bandpass response when
operating in a complex frequency shifted IF mode. There are
two possible correction filter modes.
-140
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
NORMALIZED FREQUENCY (NYQUIST=1)
1
Real 2X
When the IF Converter is set to generate 2x sampled real
FIGURE 7. x2, IFC FREQUENCY RESPONSE
I FC  FILTER RESPONSE (x2 MODE, WITH FOLDING)
data, the Correction Filter must be reconfigured to process
this data correctly. In this mode it effectively provides one 13-
tap block-mode filter when the coefficients for the two filters
are programmed identically.
0
BYPASS
-20
-40
-60
I
Q
FROM
IFC
2
2
Z -1
I/Q FIRs
Z -1
2
2
I
Q
-80
FIGURE 9. CORRECTION FILTER IN REAL 2X MODE
-100
Complex or Real 1x
-120
When configured for operation in the complex mode, one 13-
-140
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
NORMALIZED FREQUENCY (NYQUIST=1)
1
tap filter is provided for each the I and Q channels. In Real 1x
mode, the Q channel is not used.
FIGURE 7A. x2, IFC FREQUENCY RESP. WITH FOLDING
BYPASS
Complex
The complex operating mode simply shifts the complex
baseband signal up by Fs/4 without any filtering or real
I
Q
FROM
IFC
I-CHAN
FIR
Q-CHAN
FIR
I
Q
conversion. The operation of the IF converter in this mode is
shown in Figure 8.
BYPASS
FIGURE 10. CORRECTION FILTER IN COMPLEX MODE
Output Data Conditioner (ODC)
I
Q
FROM
PD
e j(pi/2)(n)
I
Q
The Output Data Conditioner can apply I/Q balance
corrections, DC offset corrections and output format
conversions.
To compensate for gain/phase imperfections in external
FIGURE 8. IF CONVERTER IN COMPLEX MODE OPERATION
analog modulation circuits which can result in poor image
rejection and reduced dynamic range, the ODC provides an
I/Q balance corrector. The I/Q balance corrector provides
four coefficients to control the magnitude of the direct and
9
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