Datasheet
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
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Pin Description
PIN
MAX1304
MAX1308
MAX1312
MAX1305
MAX1309
MAX1313
MAX1306
MAX1310
MAX1314
NAME
FUNCTION
1, 15, 17 1, 15, 17 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 4 4 CH0 Channel 0 Analog Input
5 5 5 CH1 Channel 1 Analog Input
666MSV
Midscale Voltage Bypass. For the unipolar MAX1304/MAX1305/MAX1306,
connect a 2.2µF and a 0.1µF capacitor from MSV to AGND. For the bipolar
MAX1308/MAX1309/MAX1310/MAX1312/MAX1313/MAX1314, connect
MSV to AGND.
7 7 — CH2 Channel 2 Analog Input
8 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 13 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 18 18
REF
MS
Midscale Reference Bypass or Input. REF
MS
connects through a 5k_ resistor to
the internal +2.5V bandgap reference buffer.
For the MAX1304/MAX1305/MAX1306 unipolar devices, V
REFMS
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 REF
MS
with a ≥ 0.01µF
capacitor to AGND. For external reference operation, drive REF
MS
with an
external voltage from +2V to +3V.
For the MAX1308/MAX1309/MAX1310/MAX1312/MAX1313/MAX1314 bipolar
devices, connect REF
MS
to REF. For internal reference operation, bypass the
REF
MS
/REF node with a ≥ 0.01µF capacitor to AGND. For external reference
op er ati on, d r i ve the RE F
M S
/RE F nod e w i th an exter nal vol tag e fr om + 2V to + 3V .
19 19 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 ≥ 0.01µF 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 REF
MS
to REF and
drive the REF
MS
/REF node with an external voltage from +2V to +3V.