MAX1132 Datasheet, PDF (10/19 Pages) Maxim Integrated Products – 16-Bit ADC, 200ksps, 5V Single-Supply with Reference

16-Bit ADC, 200ksps, 5V Single-Supply
with Reference
Table 1. Control Byte Format
BIT
7 (MSB)
NAME
START
DESCRIPTION
The first logic “1” bit, after CS goes low, defines the beginning of the Control Byte
6
5
4
3
2
1
0(LSB)
UNI/BIP
INT/EXT
M1
M0
P2
P1
P0
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, analog
input signals from 0 to +12V (MAX1132) or 0 to V_REF (MAX1133) can be converted. In bipolar
mode analog input signals from -12V to +12V (MAX1132) or -V_REF to +V_REF (MAX1133) can be
converted.
Selects the internal or external conversion clock. 1 = Internal, 0 = External.
M1
M0
MODE
0
0
24 External clocks per conversion (short acquisition mode)
0
1
Start Calibration. Starts internal calibration.
1
0
Software power-down mode
1
1
32 External clocks per conversion (long acquisition mode)
These three bits are stored in a port register and output to pins P2, P1, P0 for use in addressing
a mux or PGA. These three bits are updated in the port register simultaneously when a new
Control Byte is written.
Table 2. User-Programmable Outputs
OUTPUT
PIN
PROGRAMMED
THROUGH
CONTROL BYTE
POWER-ON
OR RST
DEFAULT
DESCRIPTION
P2
Bit 2
P1
Bit 1
P0
Bit 0
0
User-programmable outputs follow the state of the Control Byte’s three LSBs
0
and are updated simultaneously when a new Control Byte is written. Outputs
are push-pull. In hardware and software shutdown, these outputs are
0
unchanged and remain low-impedance.
CS
SCLK
DIN
SSTRB
t_ACQ
1
4
8
START
UNI/
BIP
INT/
EXT
M1
M0
P2
P1
P0
12
15
DOUT
A/D
IDLE
STATE
ACQUISITION
B15
MSB
B14
B13
B12 B11
B10 B9
CONVERSION
21
24
B4 B3
B2
B1
B0
LSB
FILLED WITH
ZEROS
IDLE
Figure 2. Short Acquisition Mode (24-Clock Cycles) External Clock, Bipolar Mode
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