Datasheet
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
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Method 1 allows the direct application of an external
reference from 1.5V to V
DD
+ 50mV. The REF input
impedance is typically 10kΩ. During conversion, an
external reference at REF must deliver up to 210µA and
have an output impedance less than 10Ω. Bypass REF
with a 0.1µF capacitor to AGND to improve its output
impedance.
Method 2 utilizes the internal reference buffer to reduce
the external reference load. The REFADJ input imped-
ance is typically 20kΩ. During a conversion, an external
reference at REFADJ must deliver at least 100µA and
have an output impedance less than 100Ω. The
MAX1146/MAX1148 reference buffer has a 3.277V/V
gain and the MAX1147/MAX1149 has a gain of
2.000V/V. The external reference voltage at REFADJ
multiplied by the reference buffer gain is the SAR ADC
reference voltage. This reference appears at REF and
must be from 1.5V to V
DD
+ 50mV. Bypass REFADJ
with a 0.01µF capacitor and bypass REF with a 2.2µF
capacitor to AGND.
Transfer Function
Table 7 shows the full-scale voltage ranges for unipolar
and bipolar modes.
Output data coding for the MAX1146–MAX1149 is bina-
ry in unipolar mode and two’s complement binary in
bipolar mode with 1 LSB = (V
REF
/2
N
), where N is the
number of bits (14). Code transitions occur halfway
between successive-integer LSB values. Figure 14 and
Figure 15 show the input/output (I/O) transfer functions
for unipolar and bipolar operations, respectively.
Serial Interfaces
The MAX1146–MAX1149 feature a serial interface that
is fully compatible with SPI, QSPI, and MICROWIRE. If a
serial interface is available, establish the CPU’s serial
interface as a master, so that the CPU generates the
serial clock for the ADCs. Select a clock frequency up
to 2.1MHz.
SPI and MICROWIRE Interface
When using an SPI (Figure 16a) or MICROWIRE interface
(Figure 16b), set CPOL = CPHA = 0. Two 8-bit readings
are necessary to obtain the entire 14-bit result from the
ADC. DOUT data transitions on the serial clock’s falling
MAX1146–
MAX1149
MAX6163
1.250V
BANDGAP
REFERENCE
20kΩ
SAR
ADC
REF
REFERENCE
BUFFER
DISABLED
DGND
V
DD
0.1µF
0.1µF
+5V
OUT
IN
GND
+5V
3.000V
AGND
REFADJ
REF
Figure 12. External Reference Applied to REF
MAX1146–
MAX1149
0.047µF
510kΩ
24kΩ
100kΩ
+3.3V
REFADJ
Figure 13. Reference Adjust Circuit
UNIPOLAR MODE BIPOLAR MODE
INPUT AND OUTPUT
MODES
ZERO SCALE FULL SCALE
NEGATIVE FULL
SCALE
ZERO SCALE
POSITIVE FULL
SCALE
Single-Ended Mode V
COM
V
REF
+ V
COM
V
COM
Differential Mode V
IN-
V
REF
+ V
IN-
V
IN-
Table 7. Full Scale and Zero Scale
Note: The common mode range for the analog inputs is from AGND to V
DD
.
−
+
V
V
REF
COM
2
−
+ −
V
V
REF
IN
2
+
+
V
V
REF
COM
2
+
+
−
V
V
REF
IN
2