MAX1332 Datasheet, PDF (12/25 Pages) Maxim Integrated Products – 3Msps/2Msps, 5V/3V, 2-Channel, True-Differential 12-Bit ADCs

3Msps/2Msps, 5V/3V, 2-Channel, True-
Differential 12-Bit ADCs
Pin Description
PIN
NAME
FUNCTION
1
AIN0P Positive Analog-Input Channel 0
2
AIN0N Negative Analog-Input Channel 0
3
AIN1P Positive Analog-Input Channel 1
4
AIN1N Negative Analog-Input Channel 1
5
REF
External Reference Voltage Input. V_REF = 1V to (AV_DD + 50mV). Bypass REF to AGND with a 0.1µF
and a 1µF.
6
SHDN
Shutdown Input. Pull SHDN low to enter full power-down mode. Drive SHDN high to resume normal
operation regardless of previous software entered into power-down mode.
7
BIP/UNI ^{Analog-Input-Mode Select. Drive BIP/UNI high to select bipolar-input mode. Pull BIP/UNI low to select}
unipolar-input mode.
8
AGND Analog Ground. Connect all AGNDs and EP to the same potential.
9
CHSEL Channel-Select Input. Drive CHSEL high to select channel 1. Pull CHSEL low to select channel 0.
Conversion-Start Input. The first rising edge of CNVST powers up the MAX1332/MAX1333 and begins
acquiring the analog input. A falling edge samples the analog input and starts a conversion. CNVST
10
CNVST _{also controls the power-down mode of the device (see the Partial Power-Down (PPD) and Full Power-}
Down (FPD) Mode section).
11
SCLK Serial-Clock Input. Clocks data out of the serial interface. SCLK also sets the conversion speed.
12
DOUT
Serial-Data Output. Data is clocked out on the rising edge of SCLK (see the Starting a Conversion
section).
Positive-Digital-Supply Input. DV_DD is the positive supply input for the digital section of the
13
DV_DD
MAX1332/MAX1333. Connect DV_DD to a 2.7V to 3.6V power supply. Bypass DV_DD to DGND with a
0.1µF capacitor in parallel with a 1µF capacitor. Place the bypass capacitors as close to the device
as possible.
14
DGND Digital Ground. Ensure that the potential difference between AGND and DGND is less than ±0.3V.
Positive-Analog-Supply Input. AV_DD is the positive supply input for the analog section of the
15
AV_DD
MAX1332/MAX1333. Connect AV_DD to a 4.75V to 5.25V power supply for the MAX1332. Connect
AV_DD to a 2.7V to 3.6V power supply for the MAX1333. Bypass AV_DD to AGND with a 0.1µF capacitor
in parallel with a 1µF capacitor. Place the bypass capacitors as close to the device as possible.
16
AGND Analog Ground. Connect all AGNDs and EP to the same potential.
—
EP
Exposed Paddle. Internally connected to AGND. Connect the exposed paddle to the analog ground plane.
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