AD9857AST Analog Devices Inc, AD9857AST Datasheet - Page 11

• Manufacturer Part Number: AD9857AST
• Description: IC QUADRATURE DGTL UPCONV 80LQFP
• Manufacturer: Analog Devices Inc
• Series: AD9857r

Specifications of AD9857AST

• Rohs Status: RoHS non-compliant
• Function: Upconverter
• Frequency: 5MHz ~ 200MHz
• Rf Type: HFC Cable Network
• Package / Case: 80-LQFP

TYPICAL PERFORMANCE CHARACTERISTICS
MODULATED OUTPUT SPECTRAL PLOTS
Figure 3. QPSK at 42 MHz and 2.56 MS/s; 10.24 MHz External Clock
–100
Figure 4. 64-QAM at 28 MHz and 6 MS/s; 36 MHz External Clock
–10
–20
–30
–40
–50
–60
–70
–80
–90
–16
–24
–32
–40
–48
–56
–64
–72
–80
–8
0
0
with REFCLK Multiplier = 12, CIC Interpolation Rate = 3,
START 0Hz
START 0Hz
with REFCLK Multiplier = 4, CIC Interpolation Rate = 2,
4× Oversampled Data
3× Oversampled Data
4MHz/
5MHz/
STOP 50MHz
STOP 40MHz
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Figure 5. 16-QAM at 65 MHz and 1.28 MS/s; 10.24 MHz External Clock
Figure 6. 256-QAM at 38 MHz and 6 MS/s; 48 MHz External Clock
–100
–16
–24
–32
–40
–48
–56
–64
–72
–80
–10
–20
–30
–40
–50
–60
–70
–80
–90
–8
0
0
with REFCLK Multiplier = 18, CIC Interpolation Rate = 9,
START 0Hz
START 0Hz
START 0Hz
with REFCLK Multiplier = 4, CIC Interpolation Rate = 2,
4× Oversampled Data
4× Oversampled Data
8MHz/
5MHz/
STOP 80MHz
STOP 50MHz
AD9857