MAX1293BEEG+ Maxim Integrated Products, MAX1293BEEG+ Datasheet - Page 18

• Manufacturer Part Number: MAX1293BEEG+
• Description: IC ADC 12BIT 250KSPS 24-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1293BEEG+

• Number Of Bits: 12
• Sampling Rate (per Second): 250k
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 762mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Number Of Adc Inputs: 4
• Architecture: SAR
• Conversion Rate: 250 KSPs
• Resolution: 12 bit
• Voltage Reference: Internal 2.5 V or External
• Supply Voltage (max): 3.3 V
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
Figure 10. Timing Diagram for Fastest Conversion
Effective number of bits (ENOB) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC’s error consists of quanti-
zation noise only. With an input range equal to the full-
scale range of the ADC, calculate the effective number
of bits as follows:
Total harmonic distortion (THD) is the ratio of the RMS
sum of the first five harmonics of the input signal to the
fundamental itself. This is expressed as:
where V
V
monics.
Spurious-free dynamic range (SFDR) is the ratio of the
RMS amplitude of the fundamental (maximum signal
component) to the RMS value of the next largest distor-
tion component.
18
D7–D0
STATE
HBEN
THD
5
CLK
WR
RD
are the amplitudes of the 2nd- through 5th-order har-
______________________________________________________________________________________
CONTROL
=
BYTE
1
20
is the fundamental amplitude, and V
1
ENOB = (SINAD - 1.76) / 6.02
×
ACQUISITION
log
D7–D0 D11–D8
2
Spurious-Free Dynamic Range
LOW
BYTE



3


Total Harmonic Distortion
HIGH
BYTE
V
Effective Number of Bits
2
SAMPLING INSTANT
2
4
+
V
3
2
5
+
V
6
4
2
+
7
V
5
2
2
through


8
/
V
1
9



CONTROL BYTE
CONVERSION
10
Figure 11. Power-Supply and Grounding Connections
TRANSISTOR COUNT: 5781
SUBSTRATE CONNECTED TO GND
R* = 5Ω
11
*OPTIONAL
V
+3V
DD
12
4.7µF
0.1µF
13
MAX1291
MAX1293
14
GND
15
SUPPLIES
Chip Information
16
COM
V
LOGIC
= +2V/+3V GND
D7–D0 D11–D8
+2V/+3V
LOW
BYTE
ACQUISITION
CIRCUITRY
DIGITAL
HIGH
DGND
BYTE