AD9778ABSVZ Analog Devices Inc, AD9778ABSVZ Datasheet - Page 32

• Manufacturer Part Number: AD9778ABSVZ
• Description: IC,D/A CONVERTER,DUAL,14-BIT,CMOS,TQFP,100PIN
• Manufacturer: Analog Devices Inc

Specifications of AD9778ABSVZ

• Number Of Bits: 14
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 300mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP Exposed Pad, 100-eTQFP, 100-HTQFP, 100-VQFP
• Package: 100TQFP EP
• Resolution: 14 Bit
• Conversion Rate: 1 GSPS
• Architecture: Interpolation Filter
• Digital Interface Type: Parallel
• Number Of Outputs Per Chip: 2
• Output Type: Current
• Full Scale Error: ±2(Typ) %FSR
• Integral Nonlinearity Error: ±1.5(Typ) LSB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AD9778A-EBZ - BOARD EVALUATION AD9778A
• Settling Time: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD9776A/AD9778A/AD9779A
With the interpolation filter and modulator combined, the
incoming signal can be placed anywhere within the Nyquist
region of the DAC output sample rate. When the input signal
is complex, this architecture allows modulation of the input
signal to positive or negative Nyquist regions (see Table 19).
The Nyquist regions of up to 4× the input data rate can be seen
in Figure 60.
Figure 57, Figure 58, and Figure 59 show the low-pass response
of the digital filters with no modulation. By turning on the modu-
lation feature, the response of the digital filters can be tuned to
anywhere within the DAC bandwidth. As an example, Figure 61
to Figure 67 show the nonshifted mode filter responses (refer to
Table 19 for shifted/nonshifted mode filter responses).
Figure 58. 4× Interpolation, Low-Pass Response to ±4× Input Data Rate
Figure 59. 8× Interpolation, Low-Pass Response to ±4× Input Data Rate
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
–4×
10
10
0
0
–8
–4
–4
–7
–3×
–6
–3
–3
(Dotted Lines Indicate 1 dB Roll-Off)
(Dotted Lines Indicate 1 dB Roll-Off)
–5
–2×
–4
–2
–2
Figure 60. Nyquist Zones
–3
–1×
f
f
OUT
OUT
–2
–1
–1
–1
(× Input Data Rate)
(× Input Data Rate)
DC
1
0
0
2
1×
3
1
1
4
2×
5
2
2
6
3×
7
8
3
3
4×
4
4
Rev. A | Page 32 of 60
Figure 62. Interpolation/Modulation Combination of −3f
Figure 63. Interpolation/Modulation Combination of −2f
Figure 61. Interpolation/Modulation Combination of 4f
–100
–100
–100
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–40
–50
–60
–70
–80
–90
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–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
10
10
0
0
0
–4
–4
–4
–3
–3
–3
–2
–2
–2
f
f
f
OUT
OUT
OUT
–1
–1
–1
(× Input Data Rate)
(× Input Data Rate)
(× Input Data Rate)
0
0
0
1
1
1
2
2
2
DAC
3
3
DAC
3
DAC
/8 Filter
/8 Filter
/8 Filter
4
4
4