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參數(shù)資料
| 型號(hào)： | AD7689 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 8-Channel, 250 kSPS PulSAR㈢ ADC. |
| 中文描述： | 16位，8通道，250 kSPS的PulSAR系列㈢ADC的。 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 2041K |
| 代理商： | AD7689 |
AD7689
Preliminary Technical Data
TRANSFER FUNCTIONS
With the inputs configured for unipolar range (single ended,
COM with ground sense, or paired differentially with IN- as
ground sense), the data output is straight binary.
With the inputs configured for bipolar range (COM = V
REF
/2, or
paired differentially with IN- = V
REF
/2), the data outputs are
two’s complement.
The ideal transfer characteristic for the AD7689 is shown in
Figure 12 and Table 8 for both unipolar and bipolar ranges with
the internal 4.096V reference.
Rev. PrC | Page 12 of 20
100...000
100...001
100...010
011...101
011...110
011...111
2’s COMP STRAIGHT
BINARY
000...000
000...001
000...010
111...101
111...110
111...111
A
ANALOG INPUT
+FSR – 1.5LSB
+FSR – 1LSB
–FSR + 1LSB
–FSR
–FSR + 0.5LSB
-
Figure 12. ADC Ideal Transfer Function
Table 8. Output Codes and Ideal Input Voltages
Description
FSR 1 LSB
Midscale + 1 LSB
Midscale
Midscale 1 LSB
FSR + 1 LSB
FSR
Unipolar Analog Input
1
V
REF
= 4.096 V
4.095938 V
2.048063 V
2.048 V
2.047938 V
62.5
μ
V
0 V
Digital Output
Code (Straight
Binary Hex)
0xFFFF
3
0x8001
0x8000
0x7FFF
0x0001
0x0000
4
Bipolar Analog Input
2
V
REF
= 4.096 V
+2.047938 V
62.5
μ
V
0
-62.5
μ
V
-2.047938 V
-2.048 V
Digital Output
Code (2’s Complement
Hex)
0x7FFF
0x0001
0x0000
4
0xFFFF
3
0x8001
0x8000
1
With COM or IN- = 0 V or all INx referenced to GND.
2
With COM or IN- = V
REF
/2.
3
This is also the code for an overranged analog input ((IN+) (IN-) , or COM, above V
REF
V
GND
).
4
This is also the code for an underranged analog input ((IN+) (IN-), or COM, below V
GND
).
TYPICAL CONNECTION DIAGRAM
Figure 13 shows an example of the recommended connection
diagram for the AD7689 when multiple supplies are available.
AD7689
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
3-WIRE INTERFACE
4
100nF
100nF
5V
22μF
2
V+
V–
1.8V TO VDD
0 TO V
REF
V+
V–
ADA4841-x
3
ADA4841-x
3
1
INTERNAL REFERNCE SHOWN. SEE REFERENCE SECTION FOR REFERENCE SELECTION.
2
C
IS USUALLY A 22μF CERAMIC CAPACITOR (X5R).
3
SEE DRIVER AMPLIFIER SECTION FOR ADDITIONAL RECOMMENDED AMPLIFIERS.
4
SEE THE DIGITAL INTERFACE SECTION FOR CONFIGURING AND READING CONVERSION DATA.
-
IN0
INn
COM
REFIN
100nF
0 TO V
REF
0 V or
V /2
Figure 13. Typical Application Diagram with Multiple Supplies
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