LMH6552SDEVAL National Semiconductor, LMH6552SDEVAL Datasheet - Page 17

• Manufacturer Part Number: LMH6552SDEVAL
• Description: BOARD EVALUATION FOR LMH6552
• Manufacturer: National Semiconductor
• Series: LMH®, PowerWise®r

Specifications of LMH6552SDEVAL

• Channels Per Ic: 1 - Single
• Amplifier Type: Differential
• Output Type: Differential
• Slew Rate: 3800 V/µs
• -3db Bandwidth: 1.5GHz
• Current - Output / Channel: 80mA
• Operating Temperature: -40°C ~ 85°C
• Current - Supply (main Ic): 22.5mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 12 V, ±2.25 V ~ 6 V
• Board Type: Fully Populated
• Utilized Ic / Part: LMH6552
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The amplifier is configured to provide a gain of 2 V/V in a sin-
gle-to-differential mode. The LMH6552 common mode volt-
age is set by the ADC14DS105. Circuit testing is the same as
described for the LMH6552 and ADC12DL080 combination
circuit. The 0.1 µF capacitor, in series with the 49.9Ω resistor,
is inserted to ground across the 68.1Ω resistor to balance the
amplifier inputs.
The amplifier and ADC should be located as close as possi-
ble. Both devices require that the filter components be in close
proximity to them. The amplifier needs to have minimal par-
asitic 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 National Semi-
conductor Analog-to-Digital Converters. This is shown in Ta-
ble 3, 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 sam-
pling process (Nyquist operation, sub-sampling or over-sam-
pling). 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.
FIGURE 10. LMH6552/ADC14DS105 SFDR and SNR
FIGURE 9. Driving a 14-bit ADC
Performance vs. Frequency
30003568
30003566
17
TABLE 3. DIFFERENTIAL INPUT ADC's COMPATIBLE
WITH LMH6552 DRIVER
Product Number
ADC1173
ADC1175
ADC08351
ADC1175-50
ADC08060
ADC08L060
ADC08100
ADC08200
ADC08500
ADC081000
ADC08D1000
ADC10321
ADC10D020
ADC10030
ADC10040
ADC10065
ADC10DL065
ADC10080
ADC11DL066
ADC11L066
ADC11C125
ADC11C170
ADC12010
ADC12020
ADC12040
ADC12D040
ADC12DL040
ADC12DL065
ADC12DL066
ADC12L063
ADC12C080
ADC12DS080
ADC12L080
ADC12C105
ADC12DS105
ADC12C170
ADC14L020
ADC14L040
ADC14C080
ADC14DS080
ADC14C105
ADC14DS105
ADC14155
Sampling
(MSPS)
1000
1000
Rate
Max
100
200
500
125
170
105
105
170
105
105
155
15
20
42
50
60
60
20
20
27
40
65
65
80
66
66
10
20
40
40
40
65
66
63
80
80
80
20
40
80
80
Resolution
10
10
10
10
10
10
10
11
11
11
11
12
12
12
12
12
12
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
8
8
8
8
8
8
8
8
8
8
8
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Channels
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
SINGLE
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL