MAX1444EHJ/V+T Maxim Integrated, MAX1444EHJ/V+T Datasheet - Page 17

• Manufacturer Part Number: MAX1444EHJ/V+T
• Description: Analog to Digital Converters - ADC 10-Bit 40Msps 3.0V Low-Power ADC with Internal Reference
• Manufacturer: Maxim Integrated

Specifications of MAX1444EHJ/V+T

• Number Of Channels: 1
• Architecture: Pipeline
• Conversion Rate: 40 MSPs
• Resolution: 10 bit
• Input Type: Differential
• Snr: 59.5 dB
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Power Dissipation: 1495.3 mW
• Number Of Converters: 1
• Voltage Reference: 1.024 V

Connecting each REFIN to analog ground disables the
internal reference of each device, allowing the internal
reference ladders to be driven directly by a set of exter-
nal reference sources. Followed by a 10Hz lowpass fil-
ter and precision voltage-divider (Figure 11), the
MAX6066 generates a DC level of 2.500V. The buffered
outputs of this divider are set to 2.0V, 1.5V, and 1.0V,
with an accuracy that depends on the tolerance of the
Figure 11. Unbuffered External Reference Drives Up to 32 ADCs
3.3V
NOTE: ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH UP TO 32 ADCs.
MAX4254 POWER-SUPPLY BYPASSING.
PLACE CAPACITOR AS CLOSE AS
POSSIBLE TO THE OP AMP.
Unbuffered External Reference Drives
MAX6066
0.1μF
3
1
0.1μF
3.3V
2
______________________________________________________________________________________
21.5kΩ
1μF
21.5kΩ
21.5kΩ
21.5kΩ
21.5kΩ
2.0V
1.5V
1.0V
10
3
2
5
6
9
1/4 MAX4252
1/4 MAX4252
1/4 MAX4252
10-Bit, 40Msps, 3.0V, Low-Power
Multiple ADCs
4
4
11
4
11
11
1
7
8
ADC with Internal Reference
10μF
6V
10μF
6V
10μF
6V
1.47kΩ
3.3V
1.47kΩ
3.3V
3.3V
1.47kΩ
47Ω
47Ω
47Ω
1.0V AT -8mA
2.0V AT 8mA
1.5V AT 0mA
330μF
6V
330μF
330μF
divider resistors. The three voltages are buffered by the
MAX4252, which provides low noise and low DC offset.
The individual voltage followers are connected to 10Hz
lowpass filters, which filter both the reference voltage
and amplifier noise to a level of 3nV/√Hz. The 2.0V and
1.0V reference voltages set the differential full-scale
range of the associated ADCs at 2V
1.0V buffers drive the ADC’s internal ladder resistances
between them. Note that the common power supply for
all active components removes any concern regarding
6V
6V
0.1μF
0.1μF
0.1μF
0.1μF
N.C.
N.C.
0.1μF
0.1μF
29
31
32
29
31
32
1
2
1
2
REFOUT
REFIN
REFP
REFN
COM
REFOUT
REFIN
REFP
REFN
COM
MAX1444
MAX1444
N = 32
N = 1
P-P
. The 2.0V and
0.1μF
2.2μF
10V
17