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MAX1265 Fiches technique(PDF) 8 Page - Maxim Integrated Products

No de pièce MAX1265
Description  265ksps, 3V, 6-/2-Channel, 12-Bit ADCs with 2.5V Reference and Parallel Interface
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1265 Fiches technique(HTML) 8 Page - Maxim Integrated Products

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265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
8
_______________________________________________________________________________________
Pin Description (continued)
PIN
MAX1267
REF
21
25
MAX1265
NAME
Bandgap Reference Buffer Output/External Reference Input. Add a 4.7µF capacitor
to GND when using the internal reference.
FUNCTION
26
22
VDD
Analog +2.7V to +3.6V Power Supply. Bypass with a 0.1µF capacitor to GND.
27
23
D11
Tri-State Digital Output (D11)
28
24
D10
Tri-State Digital Output (D10)
________________Detailed Description
Converter Operation
The MAX1265/MAX1267 ADCs use a successive-
approximation (SAR) conversion technique and an input
track/hold (T/H) stage to convert an analog input signal
to a 12-bit digital output. This output format provides an
easy interface to standard microprocessors (µPs). Figure
2 shows the simplified internal architecture of the
MAX1265/MAX1267.
Single-Ended and
Pseudo-Differential Operation
The sampling architecture of the ADC’s analog com-
parator is illustrated in the equivalent input circuit in
Figure 3. In single-ended mode, IN+ is internally
switched to channels CH0–CH5 for the MAX1265
(Figure 3a) and to CH0–CH1 for the MAX1267 (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
T/H
TRI-STATE, BIDIRECTIONAL
I/O INTERFACE
12
17k
12
SUCCESSIVE-
APPROXIMATION
REGISTER
CHARGE REDISTRIBUTION
12-BIT DAC
CLOCK
ANALOG
INPUT
MULTIPLEXER
CONTROL LOGIC
AND
LATCHES
REF
REFADJ
1.22V
REFERENCE
D0–D11
12-BIT DATA BUS
(CH5)
(CH4)
(CH3)
(CH2)
CH1
CH0
COM
CLK
CS
WR
RD
INT
( ) ARE FOR MAX1265 ONLY.
VDD
GND
MAX1265
MAX1267
AV =
2.05
COMP
Figure 2. Simplified Functional Diagram of 6-/2-Channel MAX1265/MAX1267


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