LMH6629MFSLASHNOPB datasheet(32/45 Pages) TI

32 / 45 page

VIN

470, KRg

200, Rin

47, Rg

LMH6629

0.417V

Vset

Vin-

Vin+

VREF

470, KRg

1k, Rf

ADC

2.5V

GND

3Vpp

2.5V

3Vpp

2.32k

464

600 mVpp

Rin

200

Let R

;

set =

417

2 x

10 +

Vpp

diff

;

mVpp

600

Example

K =

V diff

Expression

Governing

set

K +

LMH6629

SNOSB18I – APRIL 2010 – REVISED DECEMBER 2014

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The following discussion details some of the applications that can benefit from the LMH6629’s ultra-low noise,

wide bandwidth, and single supply capability.

Note that It is essential to use a low-noise / low-distortion device to drive a high resolution ADC. This will

minimize the impact on the quantization noise and to make sure that the driver’s distortion does not dominate the

acquired data.

Equation 11 demonstrates the converter noise expression and Equation 12 shows the converter noise

expression evaluated for the example depicted in Figure 66. Figure 67 shows a high-performance low-noise

equalizer for such applications as magnetic tape channels using the LMH6629. Figure 68 shows the circuit’s

simulated frequency response.

8.2 Typical Application

Many high-resolution data converters (ADC’s) require a differential input driver. In order to preserve the ADC’s

dynamic range, the analog input driver must have a noise floor which is lower than the ADC’s noise floor.

Figure 66 shows a ground referenced bipolar input (symmetrical swing around 0V) SE to differential converter

used to drive a high resolution ADC. The combination of LMH6629’s low noise and the converter architecture

reduces the impact on the ADC noise.

Figure 66. Low-Noise Single-Ended (SE) to Differential Converter

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