MAX1206 Datasheet, PDF (28/29 Pages) Maxim Integrated Products – 40Msps, 12-Bit ADC

40Msps, 12-Bit ADC
Two-Tone Spurious-Free
Dynamic Range (SFDR_TT)
SFDR_TT represents the ratio, expressed in decibels,
of the RMS amplitude of either input tone to the RMS
amplitude of the next-largest spurious component in
the spectrum, excluding DC offset. This spurious
component can occur anywhere in the spectrum up
to Nyquist and is usually an intermodulation product
or a harmonic.
Intermodulation Distortion (IMD)
IMD is the ratio of the RMS sum of the intermodulation
products to the RMS sum of the two fundamental input
tones. This is expressed as:

IMD = 20 x log _{}
V_IMP12
+
V_IMP2 ² + • • •
V₁₂ + V₂²
•+
V_IMPn ²


The fundamental input tone amplitudes (V₁ and V₂) are
at -7dBFS. Fourteen intermodulation products (V_{IMP_})
are used in the MAX1206 calculation. The intermodula-
tion products are the amplitudes of the output spectrum
at the following frequencies:
• 2nd-order intermodulation products: f1 + f2, f2 - f1
• 3rd-order intermodulation products: 2 x f1 - f2, 2 x f2
- f1, 2 x f1 + f2, 2 x f2 + f1
• 4th-order intermodulation products: 3 x f1 - f2, 3 x f2
- f1, 3 x f1 + f2, 3 x f2 + f1
• 5th-order intermodulation products: 3 x f1 - 2 x f2, 3
x f2 - 2 x f1, 3 x f1 + 2 x f2, 3 x f2 + 2 x f1
3rd-Order Intermodulation (IM3)
IM3 is the total power of the 3rd-order intermodulation
products to the Nyquist frequency relative to the total
input power of the two input tones f1 and f2. The indi-
vidual input tone levels are at -7dBFS. The 3rd-order
TOP VIEW
Pin Configuration
REFP 1
REFN 2
COM 3
GND 4
INP 5
INN 6
GND 7
DCE 8
CLKN 9
CLKP 10
MAX1206
EXPOSED PADDLE (GND)
30 D0
29 D1
28 D2
27 D3
26 D4
25 D5
24 D6
23 D7
22 D8
21 D9
THIN QFN
6mm × 6mm × 0.8mm
intermodulation products are 2 x f1 - f2, 2 x f2 - f1, 2 x
f1 + f2, 2 x f2 + f1.
Chip Information
TRANSISTOR COUNT: 18,700
PROCESS: CMOS
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