MAX1421ECM+D Maxim Integrated Products, MAX1421ECM+D Datasheet - Page 14

• Manufacturer Part Number: MAX1421ECM+D
• Description: IC ADC 12BIT 40MSPS 48LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1421ECM+D

• Number Of Bits: 12
• Sampling Rate (per Second): 40M
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 214mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

error specification of less than 1LSB guarantees no
missing codes.
Figure 10 depicts the aperture jitter (t
sample-to-sample variation in the aperture delay.
Aperture delay (t
falling edge of the sampling clock and the instant when
an actual sample is taken (Figure 10).
For a waveform perfectly reconstructed from digital
samples, the theoretical maximum SNR is the ratio of
12-Bit, 40Msps, 3.3V, Low-Power ADC
with Internal Reference
14
Figure 7. Typical Application Circuit for Single-Ended to Differential Conversion
INPUT
______________________________________________________________________________________
300Ω
MAX4108
Dynamic Parameter Definitions
+5V
-5V
300Ω
AD
) is the time defined between the
0.1µF
0.1µF
Signal-to-Noise Ratio (SNR)
300Ω
300Ω
300Ω
300Ω
AJ
Aperture Delay
600Ω
Aperture Jitter
600Ω
), which is the
0.1µF
0.1µF
MAX4108
MAX4108
-5V
-5V
+5V
+5V
600Ω
300Ω
0.1µF
0.1µF
0.1µF
0.1µF
the full-scale analog input (RMS value) to the RMS
quantization error (residual error). The ideal theoretical
minimum analog-to-digital noise is caused by quantiza-
tion error only and results directly from the ADCs reso-
lution (N-bits):
In reality, there are other noise sources besides quanti-
zation noise e.g., thermal noise, reference noise, clock
jitter, etc. SNR is computed by taking the ratio of the
RMS signal to the RMS noise, which includes all spec-
tral components minus the fundamental, the first four
harmonics, and the DC offset.
0.1µF
0.22µF
SNR
*TWO C
ONE 44pF CAP, TO IMPROVE PERFORMANCE.
LOWPASS FILTER
LOWPASS FILTER
50Ω
R
R
50Ω
ISO
(MAX)
ISO
IN
(22pF) CAPS MAY BE REPLACED BY
= (6.02
44pF*
C
22pF
1nF
C
22pF
IN
IN
*
*
✕
N + 1.76)dB
INP
CML
INN
MAX1421