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| 型號(hào)： | AD7691BRMZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | LEAD FREE, MO-187BA, MSOP-10 |
| 文件頁(yè)數(shù)： | 8/28頁(yè) |
| 文件大?。?/td> | 682K |
| 代理商： | AD7691BRMZ |
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AD7691
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Rev. 0 | Page 8 of 28
REF
1
VDD
2
IN+
3
IN–
4
GND
5
VIO
10
SDI
9
SCK
8
SDO
7
CNV
6
AD7691
TOP VIEW
(Not to Scale)
0
Figure 5. 10-Lead MSOP Pin Configuration
1
REF
2
VDD
3
IN+
4
IN–
5
GND
10 VIO
NOTES
1. QFN PACKAGE IN DEVELOPMENT. CONTACT
SALES FOR SAMPLES AND AVAILABILITY.
Figure 6. 10-Lead QFN (LFCSP) Pin Configuration
9
SDI
8
SCK
7
SDO
6
CNV
TOP VIEW
(Not to Scale)
AD7691
0
Table 7. Pin Function Descriptions
Pin No.
Mnemonic
1
REF
Type
1
AI
Description
Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin. This
pin should be decoupled closely to the pin with a 10 μF capacitor.
Power Supply.
Differential Positive Analog Input.
Differential Negative Analog Input.
Power Supply Ground.
Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions
and selects the interface mode of the part, either chain or CS mode. In CS mode, it enables the
SDO pin when low. In chain mode, the data should be read when CNV is high.
Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.
Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this
clock.
Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC
as follows:
Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a
data input to daisy-chain the conversion results of two or more ADCs onto a single SDO line.
The digital data level on SDI is output on SDO with a delay of 18 SCK cycles.
CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV
can enable the serial output signals when low, and if SDI or CNV is low when the conversion is
complete, the busy indicator feature is enabled.
Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V,
2.5 V, 3 V, or 5 V).
2
3
4
5
6
VDD
IN+
IN
GND
CNV
P
AI
AI
P
DI
7
8
SDO
SCK
DO
DI
9
SDI
DI
10
VIO
P
1
AI = analog input, DI = digital input, DO = digital output, and P = power.
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