LMH6552 Datasheet, PDF (26/38 Pages) Texas Instruments – 1.5-GHz Fully Differential Amplifier

LMH6552
SNOSAX9I – APRIL 2007 – REVISED JANUARY 2015
www.ti.com
Table 2. Differential Input ADCs Compatible With LMH6552 Driver (continued)
Product Number
ADC11C170
ADC12010
ADC12020
ADC12040
ADC12D040
ADC12DL040
ADC12DL065
ADC12DL066
ADC12L063
ADC12C080
ADC12DS080
ADC12L080
ADC12C105
ADC12DS105
ADC12C170
ADC14L020
ADC14L040
ADC14C080
ADC14DS080
ADC14C105
ADC14DS105
ADC14155
Max Sampling Rate (MSPS)
170
10
20
40
40
40
65
66
63
80
80
80
105
105
170
20
40
80
80
105
105
155
Resolution
11
12
12
12
12
12
12
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
Channels
SINGLE
SINGLE
SINGLE
SINGLE
DUAL
DUAL
DUAL
DUAL
SINGLE
SINGLE
DUAL
SINGLE
SINGLE
DUAL
SINGLE
SINGLE
SINGLE
SINGLE
DUAL
SINGLE
DUAL
SINGLE
10 Power Supply Recommendations
The LMH6552 can be used with any combination of positive and negative power supplies as long as the
combined supply voltage is between 4.5 V and 12 V. The LMH6552 will provide best performance when the
output voltage is set at the mid supply voltage, and when the total supply voltage is between 9 V and 12 V.
When selecting a supply voltage that is less than 9 V, it is important to consider both the input common mode
voltage range as well as the output voltage range.
Power supply bypassing as shown in Power Supply Bypassing is important and power supply regulation should
be within 5% or better using a supply voltage near the edges of the operating range.
10.1 Power Supply Bypassing
The LMH6552 requires supply bypassing capacitors as shown in Figure 53 and Figure 54. The 0.01-µF and 0.1-
µF capacitors should be leadless SMT ceramic capacitors and should be no more than 3 mm from the supply
pins. These capacitors should be star routed with a dedicated ground return plane or trace for best harmonic
distortion performance. A small capacitor, ~0.01 µF, placed across the supply rails, and as close to the chip's
supply pins as possible, can further improve HD2 performance. Thin traces or small vias will reduce the
effectiveness of bypass capacitors. Also shown in both figures is a capacitor from the V_CM and ENABLE pins to
ground. These inputs are high impedance and can provide a coupling path into the amplifier for external noise
sources, possibly resulting in loss of dynamic range, degraded CMRR, degraded balance and higher distortion.
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