參數(shù)資料
型號(hào)： MAX1333
廠商： Maxim Integrated Products, Inc.
英文描述： 18-Bit Bus-Interface D-Type Latches With 3-State Outputs 56-SSOP -40 to 85
中文描述： 3Msps/2Msps、5V/3V、雙通道、真差分12位ADC
文件頁數(shù)： 18/25頁
文件大小： 379K
代理商： MAX1333
M
Determine the differential analog input voltage as a
function of V
REF
and the digital output code with the fol-
lowing equation:
where:
CODE
10
= the decimal equivalent of the digital output
code (see Tables 1 and 2).
±0.5 x LSB represents the quantization error that is
inherent to any ADC.
When using a 4.096V reference, 1 LSB equals 1.0mV.
When using a 2.5V reference, 1 LSB equals 0.61mV.
Applications Information
External Reference
The MAX1332/MAX1333 use an external reference
between 1V and (AV
DD
+ 50mV). Bypass REF with
a 1μF capacitor in parallel with a 0.1μF capacitor
to AGND for best performance (see the
Typical
Operating Circuit
).
Connection to Standard Interfaces
The MAX1332/MAX1333 serial interface is fully compat-
ible with SPI, QSPI and MICROWIRE (see
Figure 11). If
a serial interface is available, set the μC’s serial inter-
face in master mode so the μC generates the serial
clock. Choose a clock frequency based on the AV
DD
and DV
DD
amplitudes.
SPI and MICROWIRE
When using SPI or MICROWIRE, the MAX1332/
MAX1333 are compatible with all four modes pro-
grammed with the CPHA and CPOL bits in the SPI or
MICROWIRE control register. (This control register is in
V
V
V
V
LSB
V
4096
AIN
AIN P
AIN N
REF
212
REF
=
=
=
_
_
V
LSB CODE
LSB
AIN
=
±
×
10
0 5
3Msps/2Msps, 5V/3V, 2-Channel, True-
Differential 12-Bit ADCs
18
______________________________________________________________________________________
BINARY DIGITAL OUTPUT
CODE D11–D0
HEXADECIMAL EQUIVALENT
OF D11–D0
DECIMAL EQUIVALENT OF
D11–D0 (CODE
10
)
4095
4094
2049
2048
2047
1
0
DIFFERENTIAL INPUT
VOLTAGE (V) (V
REF
= 4.096V
)
+4.095 ±0.5 LSB
+4.094 ±0.5 LSB
+2.049 ±0.5 LSB
+2.048 ±0.5 LSB
+2.047 ±0.5 LSB
+0.001 ±0.5 LSB
+0.000 ±0.5 LSB
1111 1111 1111
1111 1111 1110
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
0xFFF
0xFFE
0x801
0x800
0x7FF
0x001
0x000
Table 1. Unipolar Code Table (MAX1332)
TWO’s-COMPLEMENT
DIGITAL OUTPUT CODE
D11–D0
HEXADECIMAL EQUIVALENT
OF D11–D0
DECIMAL EQUIVALENT OF
D11–D0 (CODE
10
)
DIFFERENTIAL INPUT
VOLTAGE (V) (V
REF
= 4.096V)
0111 1111 1111
0111 1111 1110
0000 0000 0001
0000 0000 0000
1111 1111 1111
1000 0000 0001
1000 0000 0000
0x7FF
0x7FE
0x001
0x000
0xFFF
0x801
0x800
+2047
+2046
+1
0
-1
-2047
-2048
+2.047 ±0.5 LSB
+2.046 ±0.5 LSB
+0.001 ±0.5 LSB
0.000 ±0.5 LSB
-0.001 ±0.5 LSB
-2.047 ±0.5 LSB
-2.048 ±0.5 LSB
Table 2. Bipolar Code Table (MAX1332)
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