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MAX1304–MAX1306/MAX1308–MAX1310/MAX1312–MAX1314
8-/4-/2-Channel, 12-Bit, Simultaneous-Sampling ADCs
with ±10V, ±5V, and 0 to +5V Analog Input Ranges
______________________________________________________________________________________
13
Pin Description
PIN
MAX1304
MAX1308
MAX1312
MAX1305
MAX1309
MAX1313
MAX1306
MAX1310
MAX1314
NAME
FUNCTION
1, 15, 17
AVDD
Analog Power Input. AVDD is the power input for the analog section of the
converter. Apply +5V to AVDD. Connect all AVDD pins together. See the
Layout, Grounding, and Bypassing section for additional information.
2, 3, 14,
16, 23
2, 3, 14,
16, 23
2, 3, 14,
16, 23
AGND
Analog Ground. AGND is the power return for AVDD. Connect all AGND
pins together.
4
CH0
Channel 0 Analog Input
5
CH1
Channel 1 Analog Input
66
6
MSV
Midscale Voltage Bypass. For the unipolar MAX1304/MAX1305/MAX1306,
connect a 2.2F and a 0.1F capacitor from MSV to AGND. For the bipolar
MAX1308/MAX1309/MAX1310/MAX1312/MAX1313/MAX1314, connect
MSV to AGND.
7
—
CH2
Channel 2 Analog Input
8
—
CH3
Channel 3 Analog Input
9
—
CH4
Channel 4 Analog Input
10
—
CH5
Channel 5 Analog Input
11
—
CH6
Channel 6 Analog Input
12
—
CH7
Channel 7 Analog Input
13
INTCLK/
EXTCLK
Clock-Mode Select Input. Connect INTCLK/EXTCLK to AVDD to select the
internal clock. Connect INTCLK/EXTCLK to AGND to use an external clock
connected to CLK.
18
REFMS
Midscale Reference Bypass or Input. REFMS connects through a 5k_ resistor to
the internal +2.5V bandgap reference buffer.
For the MAX1304/MAX1305/MAX1306 unipolar devices, VREFMS is the input to
the unity-gain buffer that drives MSV. MSV sets the midpoint of the input voltage
range. For internal reference operation, bypass REFMS with a ≥ 0.01F
capacitor to AGND. For external reference operation, drive REFMS with an
external voltage from +2V to +3V.
For the MAX1308/MAX1309/MAX1310/MAX1312/MAX1313/MAX1314 bipolar
devices, connect REFMS to REF. For internal reference operation, bypass the
REFMS/REF node with a ≥ 0.01F capacitor to AGND. For external reference
operation, drive the REFMS/REF node with an external voltage from +2V to +3V.
19
REF
ADC Reference Bypass or Input. REF connects through a 5k_ resistor to the
internal +2.5V bandgap reference buffer.
For internal reference operation, bypass REF with a ≥ 0.01F capacitor.
For external reference operation with the MAX1304/MAX1305/MAX1306
unipolar devices, drive REF with an external voltage from +2V to +3V.
For external reference operation with the MAX1308/MAX1309/MAX1310/
MAX1312/MAX1313/MAX1314 bipolar devices, connect REFMS to REF and
drive the REFMS/REF node with an external voltage from +2V to +3V.
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