LMH6611MK/NOPB National Semiconductor, LMH6611MK/NOPB Datasheet - Page 23

• Manufacturer Part Number: LMH6611MK/NOPB
• Description: IC AMP 345MHZ 3.2MA R-R TSOT23-6
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMH6611MK/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 460 V/µs
• Gain Bandwidth Product: 135MHz
• -3db Bandwidth: 365MHz
• Current - Input Bias: 6.5µA
• Voltage - Input Offset: 74µV
• Current - Supply: 3.3mA
• Current - Output / Channel: 120mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 11 V, ±1.35 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-6, TSOT-6
• For Use With: 551600083-001 - BOARD FOR SOT23 LMH6611/18
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMH6611MK

SINGLE-ENDED TO DIFFERENTIAL ADC DRIVER
The single-ended to differential ADC driver in Figure 3 utilizes
an LMH6612 dual op amp to buffer a single-ended source to
drive an ADC with differential inputs. One of the op amps is
configured as a unity gain buffer that drives the inverting
(IN−) input of the op amp U2 and non-inverting (IN+) input of
the ADC121S625. U2 inverts the input signal and drives the
inverting input of the ADC121S625. The ADC driver is con-
figured for a gain of +2 to reduce the noise without sacrificing
THD performance. The common mode voltage of 2.5V is set
FIGURE 6. Single-Ended to Differential ADC Driver
FIGURE 5. LMH6611 and ADC121S101 Layout
23
up at the non-inverting inputs of both op amps U1 and U2.
This configuration produces differential ±2.5 V
nals, when the single-ended input signal of 0 to V
coupled into the non-inverting terminal of the op amp and
each non-inverting terminal of the op amp is biased at the mid-
scale of 2.5V. The two output RC anti-aliasing filters are used
between both the outputs of U1 and U2 and the input of the
ADC121S625 to minimize the effect of undesired high fre-
quency noise coming from the input source. Each RC filter
has the cutoff frequency of approximately 22 MHz.
30033640
PP
www.national.com
output sig-
REF
30033680
is AC