ADC34J42 Datasheet, PDF (80/90 Pages) Texas Instruments – ADC34J4x Quad-Channel, 14-Bit, 50-MSPS to 160-MSPS, Analog-to-Digital Converter with a JESD204B Interface

ADC34J42, ADC34J43, ADC34J44, ADC34J45
SBAS664B – MAY 2014 – REVISED NOVEMBER 2014
Typical Applications (continued)
10.2.3 Driving Circuit Design: Input Frequencies Greater than 230 MHz
0.1uF
0.1uF
0.1uF
25 Ÿ
10 Ÿ
INP
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25 Ÿ
1:1
1:1
0.1uF
10 Ÿ
INM
VCM
Figure 206. Driving Circuit for High Input Frequencies (f_IN > 230 MHz)
Device
10.2.3.1 Design Requirements
See the Design Requirements section for further details.
10.2.3.2 Detailed Design Procedure
For high input frequencies (> 230 MHz), using the R-C-R or R-LC-R circuit does not show significant
improvement in performance. However, a series resistance of 10 Ω can be used as shown in Figure 206.
10.2.3.3 Application Curve
Figure 207 shows the performance obtained by using the circuit shown in Figure 206.
0
±20
±40
±60
±80
±100
±120
0
16
32
48
64
80
Frequency (MHz)
C009
f_S = 160 MSPS, SNR = 63.4 dBFS, f_IN = 450 MHz,
SFDR = 63 dBc
Figure 207. Performance FFT at 450 MHz (High Input Frequency)
11 Power-Supply Recommendations
The device requires a 1.8-V nominal supply for AVDD and DVDD. There are no specific sequence power-supply
requirements during device power-up. AVDD and DVDD can power up in any order.
80
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