MAX44206AUA+

The sample rate for 

Figure 9

 is 1Msps and the sample 

rate for 

Figure 10

 is 1.6Msps, the MAX11905’s maximum 

sample rate. As measured at the MAX11905 output, the 

signal-to-noise ratio is > 97dB for both sample rates, with 

total harmonic distortion > 112.9dB.
Figures 11 to 13 detail the DC performance of the 

MAX44206 and MAX11905. These three figures detail 

the results of shorting the inputs together to GND at the 

V

SIG

 sources and measuring the noise histogram at the 

output of the ADC. All data was measured at 1Msps, with 

65,536 samples taken. 

Figure 11

 shows the results at a 

20-bit code level with no averaging. Effective number of 

bits (ENOB) is 17.9 bits.

One technique to improve a system’s ENOB is to aver-

age multiple samples. The tradeoff is a reduced effective 

sample rate. The theoretical expected results of averag-

ing are a 0.5 improvement in ENOB for every average 

factor of 2. Therefore, averaging by 16x should improve 

ENOB by 2 bits. 

Figure 12

 details this example, and the 

ENOB is improved nearly 2 bits, from 17.9 bits to 19.8 

bits. This shows that the noise from the ADC and the op 

amp are not limiting the ENOB.

Figure 13

 shows the results of averaging by 64x, which 

will limit the effective sample rate to 15.6ksps (1Msps/64). 

ENOB is 20.8 bits in this mode, making the MAX11905 a 

lower power alternative to high-speed 24-bit delta-sigma 

ADCs.

Figure 9. MAX11905 FFT (fSAMPLE = 1Msps, fIN = 10kHz)

MAX44206

180MHz, Low-Noise, Low-Distortion, Fully 

Differential Op Amp/ADC Driver

www.maximintegrated.com

Maxim Integrated  │

  24

MAX44206AUA+ Information:
Part No.
MAX44206AUA+

RFQ

Description
IC OPERATIONAL AMP UMAX
File Size
1576689 bytes
Page Size
612 x 792 pts (letter)
All Pages
29
Manufacturer
Maxim Integrated
Homepage
http://www.maximintegrated.com/en.html
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