MAX1185 Maxim, MAX1185 Datasheet - Page 18

• Manufacturer Part Number: MAX1185
• Description: Dual 10-Bit / 20Msps / +3V / Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs
• Manufacturer: Maxim

Dual 10-Bit, 20Msps, +3V, Low-Power ADC with
Internal Reference and Multiplexed Parallel Outputs
Figure 8. Typical QAM Application, Using the MAX1185
Figure 9. T/H Aperture Timing
18
______________________________________________________________________________________
DATA (T/H)
SAMPLED
ANALOG
INPUT
CLK
T/H
t
AD
TRACK
t
AJ
HOLD
DOWNCONVERTER
TRACK
MAX2451
THD is typically the ratio of the RMS sum of the first four
harmonics of the input signal to the fundamental itself.
This is expressed as:
where V
V
harmonics.
SFDR is the ratio expressed in decibels of the RMS
amplitude of the fundamental (maximum signal compo-
nent) to the RMS value of the next largest spurious
component, excluding DC offset.
The two-tone IMD is the ratio expressed in decibels of
either input tone to the worst 3rd-order (or higher) inter-
modulation products. The individual input tone levels
are at -6.5dB full scale and their envelope is at -0.5dB
full scale.
TRANSISTOR COUNT: 10,811
PROCESS: CMOS
5
are the amplitudes of the 2nd- through 5th-order
THD
÷ 8
Spurious-Free Dynamic Range (SFDR)
1
=
0°
is the fundamental amplitude, and V
90°
20
Intermodulation Distortion (IMD)
Total Harmonic Distortion (THD)
×
log
10




V
INA+
INA-
INB+
INB-
2
2
MAX1185
Chip Information
+
V
3
2
V
A/B
1
+
V
4
CHA AND CHB DATA
ALTERNATINGLY
AVAILABLE ON 10-BIT,
MULTIPLEXED
OUTPUT BUS
2
+
PROCESSING
V
5
POST
DSP
2
2




through