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参数资料
| 型号： | AD7851KRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT SRL 333KSPS 24-SOIC |
| 标准包装： | 31 |
| 位数： | 14 |
| 采样率（每秒）： | 333k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 1 个伪差分，单极；1 个伪差分，双极 |
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–17–
REV. B
AD7851
Transfer Functions
For the unipolar range, the designed code transitions occur mid-
way between successive integer LSB values (i.e., 1/2 LSB,
3/2 LSBs, 5/2 LSBs . . . FS –3/2 LSBs). The output coding is
straight binary for the unipolar range with 1 LSB = FS/16384 =
4.096 V/16384 = 0.25 mV when VREF = 4.096 V. The ideal
input/output transfer characteristic for the unipolar range is
shown in Figure 16.
+FS – 1LSB
OUTPUT
CODE
0V
111...111
111...110
111...101
111...100
000...011
000...001
000...000
000...010
VIN = (AIN(+) – AIN(–)), INPUT VOLTAGE
1LSB
1LSB =
FS
16384
Figure 16. AD7851 Unipolar Transfer Characteristic
Figure 15 shows the AD7851’s
±V
REF/2 bipolar analog input con-
figuration (where AIN(+) cannot go below 0 V, so for the full bipo-
lar range the AIN(–) pin should be biased to +VREF/2). Once again
the designed code transitions occur midway between successive
integer LSB values. The output coding is twos complement with
1 LSB = 16384 = 4.096 V/16384 = 0.25 mV. The ideal input/
output transfer characteristic is shown in Figure 17.
FS = VREFV
1LSB =
FS
16384
OUTPUT
CODE
VREF/2
011...111
011...110
000...001
000...000
100...001
100...000
100...010
VIN = (AIN(+) – AIN(–)), INPUT VOLTAGE
0V
+ FS – 1 LSB
111...111
(VREF/2) – 1 LSB
(VREF/2) + 1 LSB
Figure 17. AD7851 Bipolar Transfer Characteristic
Input Ranges
The analog input range for the AD7851 is 0 V to VREF in both
the unipolar and bipolar ranges.
The only difference between the unipolar range and the bipolar
range is that in the bipolar range the AIN(–) has to be biased up
to +VREF/2 and the output coding is twos complement (see
Table V and Figures 14 and 15). The unipolar or bipolar mode
is selected by the AMODE pin (0 for the unipolar range and 1
for the bipolar range).
Table V. Analog Input Connections
Analog Input
Input Connections Connection
Range
AIN(+)
AIN(–)
Diagram
AMODE
0 V to VREF
1
VIN
AGND
Figure 8
DGND
±V
REF/2
2
VIN
VREF/2
Figure 9
DVDD
NOTES
1Output code format is straight binary.
2Range is
± V
REF/2 biased about VREF/2. Output code format is twos complement.
Note that the AIN(–) pin on the AD7851 can be biased up above
AGND in the unipolar mode also, if required. The advantage of
biasing the lower end of the analog input range away from
AGND is that the user does not have to have the analog input
swing all the way down to AGND. This has the advantage in
true single-supply applications that the input amplifier does not
have to swing all the way down to AGND. The upper end of the
analog input range is shifted up by the same amount. Care must
be taken so that the bias applied does not shift the upper end of
the analog input above the AVDD supply. In the case where the
reference is the supply, AVDD, the AIN(–) must be tied to
AGND in unipolar mode.
AIN(+)
AIN(–)
AMODE
AD7851
UNIPOLAR
ANALOG
INPUT RANGE
SELECTED
DOUT
STRAIGHT
BINARY
FORMAT
VIN = 0 TO VREF
TRACK AND HOLD
AMPLIFIER
Figure 14. 0 V to VREF Unipolar Input Configuration
TWOS
COMPLEMENT
FORMAT
VREF/2
DVDD
AIN(+)
AIN(–)
AMODE
AD7851
UNIPOLAR
ANALOG
INPUT RANGE
SELECTED
DOUT
VIN = 0 TO VREF
TRACK AND HOLD
AMPLIFIER
Figure 15.
±VREF/2 about VREF/2 Bipolar Input Configuration
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