MAX1192ETI+ Maxim Integrated Products, MAX1192ETI+ Datasheet - Page 23

• Manufacturer Part Number: MAX1192ETI+
• Description: IC ADC 8BIT 22MSPS DUAL 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1192ETI+

• Number Of Bits: 8
• Sampling Rate (per Second): 22M
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN Exposed Pad
• Number Of Adc Inputs: 2
• Conversion Rate: 22 MSPs
• Resolution: 8 bit
• Input Type: Differential
• Interface Type: Parallel
• Voltage Reference: Internal 2.048 V or External
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Power Dissipation: 1667 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure
erence used as a common reference for multiple con-
verters. The 2.500V output of the MAX6066 is followed
by a 10Hz lowpass filter and precision voltage-divider.
The MAX4254 buffers the taps of this divider to provide
the 1.75V, 1.5V, and 1.25V sources to drive REFP,
REFN, and COM. The MAX4254 provides a low offset
voltage and low noise level. The individual voltage fol-
lowers are connected to 10Hz lowpass filters, which fil-
ter both the reference-voltage and amplifier noise to a
level of 3nV/√Hz. The 1.75V and 1.25V reference volt-
Figure 11. External Unbuffered Reference Driving 160 ADCs with MAX4254 and MAX6066
NOTE: ONE FRONT-END
REFERENCE CIRCUIT
SUPPORTS UP TO 160 MAX1192s
3V
11 shows the MAX6066 precision bandgap ref-
1MΩ
1MΩ
3V
0.1μF
12
13
MAX6066
Ultra-Low-Power, 22Msps, Dual 8-Bit ADC
MAX4254
______________________________________________________________________________________
1
3
1/4
4
11
2
UNCOMMITTED
0.1μF
14
2.500V
1μF
1%
30.1kΩ
1%
10.0kΩ
1%
10.0kΩ
1%
49.9kΩ
10
3
5
2
6
9
MAX4254
MAX4254
MAX4254
1/4
1/4
1/4
10μF
10μF
10μF
6V
6V
6V
1
7
8
1.47kΩ
1.47kΩ
1.47kΩ
47Ω
47Ω
47Ω
ages set the differential full-scale range of the associat-
ed ADCs at ±0.5V.
The common power supply for all active components
removes any concern regarding power-supply
sequencing when powering up or down.
With the outputs of the MAX4252 matching better than
0.1%, the buffers and subsequent lowpass filters sup-
port as many as 160 MAX1192s.
1.748V
1.498V
1.248V
330μF
6V
330μF
6V
330μF
6V
0.33μF
0.33μF
0.33μF
0.33μF
0.33μF
0.33μF
27
26
25
27
26
25
REFP
REFN
COM
REFP
REFN
COM
MAX1192
MAX1192
N = 160
N = 1
GND
GND
V
V
DD
DD
REFIN
REFIN
0.1μF
24
24
2.2μF
23