MAX1446EHJ+ Maxim Integrated Products, MAX1446EHJ+ Datasheet - Page 16

• Manufacturer Part Number: MAX1446EHJ+
• Description: IC ADC 10BIT 60MSPS 32-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1446EHJ+

• Number Of Bits: 10
• Sampling Rate (per Second): 60M
• Data Interface: Parallel
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Conversion Rate: 60 MSPs
• Resolution: 10 bit
• Snr: 59.5 dB
• Voltage Reference: 2.048 V
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Power Dissipation: 1495.3 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Input Voltage: 3 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10-Bit, 60Msps, 3.0V, Low-Power
ADC with Internal Reference
Figure 10. Buffered External Reference Drives Up to 1000 ADCs
filter. The MAX4250 provides a low offset voltage (for
high-gain accuracy) and a low noise level. The passive
10Hz filter following the buffer attenuates noise pro-
duced in the voltage reference and buffer stages. This
filtered noise density, which decreases for higher fre-
quencies, meets the noise levels specified for precision
ADC operation.
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
divider resistors. The three voltages are buffered by the
16
3.3V
______________________________________________________________________________________
Unbuffered External Reference Drives
NOTE: ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH UP TO 1000 ADCs.
MAX6062
3
1
0.1μF
2
10Hz LOWPASS
16.2kΩ
FILTER
1μF
0.1μF
3
4
Multiple ADCs
MAX4250
5
2
1
10Hz LOWPASS
3.3V
162Ω
FILTER
100μF
0.1μF
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 3n√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
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 can
be replicated to support as many as 32 ADCs. For
applications that require more than 32 matched ADCs,
a voltage reference and divider string common to all
converters is highly recommended.
2.048V
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
N.C.
N.C.
0.1μF
0.1μF
31
32
31
32
29
29
1
2
1
2
REFOUT
REFIN
REFP
REFN
COM
REFOUT
REFIN
REFP
REFN
COM
MAX1446
MAX1446
N = 1000
N = 1
P-P
0.1μF
. The 2.0V and
2.2μF
10V