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MAX1266ACEI Datasheet(PDF) 9 Page - Maxim Integrated Products

Part # MAX1266ACEI
Description  420ksps, 5V, 6-/2-Channel, 12-Bit ADCs with 2.5V Reference and Parallel Interface
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1266ACEI Datasheet(HTML) 9 Page - Maxim Integrated Products

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420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________
9
BIT
PD1, PD0
0
D7, D6
PD1 and PD0 select the various clock and power-down modes.
Full power-down mode. Clock mode is unaffected.
D5
ACQMOD
ACQMOD = 0: Internal acquisition mode
ACQMOD = 1: External acquisition mode
NAME
FUNCTIONAL DESCRIPTION
0
1
0
Standby power-down mode. Clock mode is unaffected.
0
1
1
Normal operation mode. External clock mode selected.
1
Normal operation mode. Internal clock mode selected.
D4
SGL/DIF
SGL/DIF = 0: Pseudo-differential analog input mode
SGL/DIF = 1: Single-ended analog input mode
In single-ended mode, input signals are referred to COM. In pseudo-differential mode, the voltage
difference between two channels is measured (Tables 2 and 4).
D3
UNI/BIP
UNI/BIP = 0: Bipolar mode
UNI/BIP = 1: Unipolar mode
In unipolar mode, an analog input signal from 0V to VREF can be converted; in bipolar mode, the
signal can range from -VREF/2 to +VREF/2.
D2, D1, D0
A2, A1, A0
Address bits A2, A1, A0 select which of the 6/2 (MAX1266/MAX1268) channels is to be converted
(Tables 2 and 3).
Table 1. Control-Byte Functional Description
Single-Ended and
Pseudo-Differential Operation
The sampling architecture of the ADC’s analog com-
parator is illustrated in the equivalent input circuits of
Figure 3. In single-ended mode, IN+ is internally
switched to channels CH0–CH5 for the MAX1266
(Figure 3a) and to CH0–CH1 for the MAX1268 (Figure
3b), while IN- is switched to COM (Table 2). In differen-
tial mode, IN+ and IN- are selected from analog input
pairs (Table 3) and are internally switched to either of
the analog inputs. This configuration is pseudo-differen-
tial to the effect that only the signal at IN+ is sampled.
The return side (IN-) must remain stable within ±0.5
LSB (±0.1 LSB for best performance) with respect to
GND during a conversion. To accomplish this, connect
a 0.1µF capacitor from IN- (the selected input) to GND.
Figure 3a. MAX1266 Simplified Input Structure
Figure 3b. MAX1268 Simplified Input Structure
CH0
CH1
CH3
CH2
CH5
CH4
COM
CSWITCH
TRACK
T/H
SWITCH
RIN
800
CHOLD
12pF
HOLD
12-BIT CAPACITIVE DAC
VREF
ZERO
COMPARATOR
+
SINGLE-ENDED MODE: IN+ = CH0–CH5, IN- = COM
DIFFERENTIAL MODE: IN+ AND IN- SELECTED FROM PAIRS
CH0/CH1, CH2/CH3, AND CH4/CH5
AT THE SAMPLING INSTANT,
THE MUX INPUT SWITCHES
FROM THE SELECTED IN+
CHANNEL TO THE SELECTED
IN- CHANNEL.
INPUT
MUX
CH0
CH1
COM
CSWITCH
TRACK
T/H
SWITCH
RIN
800
HOLD
ZERO
COMPARATOR
+
SINGLE-ENDED MODE: IN+ = CH0–CH1, IN- = COM
DIFFERENTIAL MODE: IN+ AND IN- SELECTED FROM PAIR
CH0/CH1
AT THE SAMPLING INSTANT,
THE MUX INPUT SWITCHES
FROM THE SELECTED IN+
CHANNEL TO THE SELECTED
IN- CHANNEL.
INPUT
MUX
CHOLD
12pF
12-BIT CAPACITIVE DAC
VREF


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