參數(shù)資料
型號(hào)： EVAL-AD7731EB
廠商： Analog Devices, Inc.
英文描述： Low Noise, High Throughput 24-Bit Sigma-Delta ADC
中文描述： 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 411K
代理商： EVAL-AD7731EB
AD7731
–17–
REV. 0
Bit
Location
Bit
Mnemonic
Description
MR12
B
/U
Bipolar/Unipolar Bit. A 0 in this bit selects bipolar operation and the output coding is
00...000 for negative full-scale input, 10...000 for zero input and 11...111 for positive full-
scale input. A 1 in this bit selects unipolar operation and the output coding is 00...000 for
zero input and 11...111 for positive full-scale input.
Digital Output Enable Bit. With this bit at 1, the AIN3/D1 and AIN4/D0 pins assume their
digital output functions and the output drivers connected to these pins are enabled. In this
mode, the user effectively has two port bits which can be programmed over the serial interface.
Digital Output Bits. T hese bits determine the digital outputs on the AIN3/D1 and AIN4/D0
pins respectively when the DEN bit is a 1. For example, a 1 written to the D1 bit of the
Mode Register (with the DEN bit also a 1) will put a logic 1 on the AIN3/D1 pin. T his logic
1 will remain on this pin until a 0 is written to the D1 bit (in which case, the AIN3/D1 pin
goes to a logic 0) or the digital output function is disabled by writing a 0 to the DEN bit.
Data Word Length Bit. T his bit determines the word length of the Data Register. A 0 in this
bit selects 16-bit word length when reading from the data register (i.e.,
RDY
returns high
after 16 serial clock cycles in the read operation). A 1 in this bit selects 24-bit word length for
the Data Register.
High Reference Bit. T his bit should be set in accordance with the reference voltage which is
being used on the part. If the reference voltage is 2.5 V, the HIREF bit should be set to 0. If
the reference voltage is 5 V, the HIREF bit should be set to a 1. With the HIREF bit set
correctly for the appropriate applied reference voltage, the input ranges are 0 mV to +20 mV,
+40 mV, +80 mV, +160 mV, +320 mV, +640 mV and +1.28 V for unipolar operation and
±
20 mV,
±
40 mV,
±
80 mV,
±
160 mV,
±
320 mV,
±
640 mV and
±
1.28 V for bipolar operation.
It is possible for a user with a 2.5 V reference to set the HIREF bit to a 1. In this case, the
part is operating with a 2.5 V reference but assumes it has a 5 V reference. As a result, the
input ranges on the part become 0 mV to +10 mV through 0 mV to +640 mV for unipolar
operation and
±
10 mV through
±
640 mV for bipolar operation. However, the output noise
from the part (in nV) will remain unchanged so the resolution of the part (in LSBs) will re-
duce by 1.
Input Range Bits. T hese bits determine the analog input range for the selected analog input.
T he different input ranges are outlined in T able X II. T he table is valid for a reference voltage
of 2.5 V with the HIREF bit at 0 or for a reference voltage of 5 V with the HIREF bit at a
logic 1.
MR11
DEN
MR10–MR9
D1–D0
MR8
WL
MR7
HIREF
MR6–MR4
RN2–RN0
T able X II. Input Range Selection
Input Range
RN2
RN1
RN0
B
/U Bit = 0
B
/U Bit = 1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
–20 mV to +20 mV
–20 mV to +20 mV
–40 mV to +40 mV
–80 mV to +80 mV
–160 mV to +160 mV
–320 mV to +320 mV
–640 mV to +640 mV
–1.28 V to +1.28 V
0 mV to +20 mV
0 mV to +20 mV
0 mV to +40 mV
0 mV to +80 mV
0 mV to +160 mV
0 mV to +320 mV
0 mV to +640 mV
0 mV to +1.28 V
Power-On/Reset Default
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