LMH6552 Datasheet, PDF (25/38 Pages) Texas Instruments – 1.5-GHz Fully Differential Amplifier

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LMH6552
SNOSAX9I – APRIL 2007 – REVISED JANUARY 2015
100
95
90
85
80
75
70
65
60
55
50
0
SFDR (dBc)
SNR (dBFs)
5 10 15 20 25 30 35 40
INPUT FREQUENCY (MHz)
Figure 52. LMH6552/ADC14DS105 SFDR and SNR Performance vs. Frequency
The amplifier and ADC should be located as close as possible. Both devices require that the filter components
be in close proximity to them. The amplifier needs to have minimal parasitic loading on the output traces and the
ADC is sensitive to high frequency noise that may couple in on its input lines. Some high performance ADCs
have an input stage that has a bandwidth of several times its sample rate. The sampling process results in all
input signals presented to the input stage mixing down into the first Nyquist zone (DC to Fs/2).
The LMH6552 is capable of driving a variety of Texas Instruments Analog-to-Digital Converters. This is shown in
Table 2, which offers a list of possible signal path ADC and amplifier combinations. The use of the LMH6552 to
drive an ADC is determined by the application and the desired sampling process (Nyquist operation, sub-
sampling or over-sampling). See application note AN-236 for more details on the sampling processes and
application note AN-1393 'Using High Speed Differential Amplifiers to Drive ADCs. For more information
regarding a particular ADC, refer to the particular ADC datasheet for details.
Product Number
ADC1173
ADC1175
ADC08351
ADC1175-50
ADC08060
ADC08L060
ADC08100
ADC08200
ADC08500
ADC081000
ADC08D1000
ADC10321
ADC10D020
ADC10030
ADC10040
ADC10065
ADC10DL065
ADC10080
ADC11DL066
ADC11L066
ADC11C125
Table 2. Differential Input ADCs Compatible With LMH6552 Driver
Max Sampling Rate (MSPS)
15
20
42
50
60
60
100
200
500
1000
1000
20
20
27
40
65
65
80
66
66
125
Resolution
8
8
8
8
8
8
8
8
8
8
8
10
10
10
10
10
10
10
11
11
11
Channels
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
DUAL
SINGLE
DUAL
SINGLE
DUAL
SINGLE
DUAL
SINGLE
DUAL
SINGLE
SINGLE
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