max5893egk-d Maxim Integrated Products, Inc., max5893egk-d Datasheet - Page 19

• Manufacturer Part Number: max5893egk-d
• Description: Max5893 12-bit, 500msps Interpolating And Modulating Dual Dac With Cmos Inputs
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5893 features three cascaded FIR half-band
filters. The interpolating filters are enabled or disabled
in combinations to support 1x (no interpolation), 2x, 4x,
or 8x interpolation. Bits 7 and 6 of register 01h set the
interpolation rate (see Table 2). The last interpolation fil-
Figure 5. Interpolation Filter Frequency Response, 2x
Interpolation Mode
Figure 7. Interpolation Filter Frequency Response, 8x
Interpolation Mode (FIR3 Lowpass Mode)
12-Bit, 500Msps Interpolating and Modulating
-100
-120
-100
-120
-20
-40
-60
-80
-20
-40
-60
-80
0
0
0
0
0.2
f
f
OUT
OUT
1
-0.0002
-0.0004
0.4 0.6 0.8
______________________________________________________________________________________
- NORMALIZED TO INPUT DATA RATE
- NORMALIZED TO INPUT DATA RATE
0
0
2
-0.0002
-0.0004
0.1
3
0
PASSBAND DETAIL
0
0.2
1.0 1.2 1.4 1.6 1.8 2.0
4
0.1
PASSBAND DETAIL
0.3
Interpolating Filter
5
0.2
0.4
6
0.3
7
0.4
8
Dual DAC with CMOS Inputs
ter is located after the modulator. In the 8x interpolation
mode, the last filter (FIR3) can be configured as low-
pass or highpass (bit 5, address 01h) to select the
lower or upper sideband from the modulation output.
The frequency responses of these three filters are plot-
ted in Figures 5–8.
Figure 6. Interpolation Filter Frequency Response, 4x
Interpolation Mode
Figure 8. Interpolation Filter Frequency Response, 8x
Interpolation Mode (FIR3 Highpass Mode)
-100
-120
-100
-120
-20
-40
-60
-80
-20
-40
-60
-80
0
0
0
0
f
f
0.5
OUT
OUT
1
-0.0002
-0.0004
-0.0002
-0.0004
- NORMALIZED TO INPUT DATA RATE
- NORMALIZED TO INPUT DATA RATE
1.0 1.5
0
0
2
0
3.6
3
0.1
3.8
PASSBAND DETAIL
PASSBAND DETAIL
2.0
4
0.2
4.0
2.5
5
0.3
4.2
3.0 3.5
6
4.4
0.4
7
4.0
8
19
-0.0002
-0.0004
0
0