參數(shù)資料
型號(hào)： AD7675ASTZRL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT DIFF INP 48LQFP
標(biāo)準(zhǔn)包裝： 2,000
系列： PulSAR®
位數(shù)： 16
采樣率（每秒）： 100k
數(shù)據(jù)接口： 串行，并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 25mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分，雙極
配用： EVAL-AD7675CBZ-ND - BOARD EVALUATION FOR AD7675
REV. A
AD7675
–6–
PIN FUNCTION DESCRIPTIONS (continued)
Pin No.
Mnemonic
Type
Description
21
DATA[8]
DO
When SER/
PAR is LOW, this output is used as the Bit 8 of the Parallel Port Data Output Bus.
or SDOUT
When SER/
PAR is HIGH, this output, part of the serial port, is used as a serial data output
synchronized to SCLK. Conversion results are stored in an on-chip register. The AD7675
provides the conversion result, MSB first, from its internal shift register. The DATA
format is determined by the logic level of OB/
2C. In serial mode, when EXT/INT is LOW,
SDOUT is valid on both edges of SCLK. In serial mode, when EXT/
INT is HIGH: If
INVSCLK is LOW, SDOUT is updated on SCLK rising edge and valid on the next falling
edge. If INVSCLK is HIGH, SDOUT is updated on SCLK falling edge and valid on the next
rising edge.
22
DATA[9]
DI/O
When SER/
PAR is LOW, this output is used as the Bit 9 of the Parallel Port Data Output Bus.
or SCLK
When SER/
PAR is HIGH, this pin, part of the serial port, is used as a serial data clock input
or output, dependent upon the logic state of the EXT/
INT Pin. The active edge where the
data SDOUT is updated depends upon the logic state of the INVSCLK Pin.
23
DATA[10]
DO
When SER/
PAR is LOW, this output is used as the Bit 10 of the Parallel Port Data Output Bus.
or SYNC
When SER/
PAR is HIGH, this output, part of the serial port, is used as a digital output frame
synchronization for use with the internal data clock (EXT/
INT = Logic LOW). When a read
sequence is initiated and INVSYNC is LOW, SYNC is driven HIGH and remains HIGH
while SDOUT output is valid. When a read sequence is initiated and INVSYNC is HIGH,
SYNC is driven LOW and remains LOW while SDOUT output is valid.
24
DATA[11]
DO
When SER/
PAR is LOW, this output is used as the Bit 11 of the Parallel Port Data Output Bus.
or RDERROR
When SER/
PAR is HIGH and EXT/INT is HIGH, this output, part of the serial port, is used
as an incomplete read error flag. In slave mode, when a data read is started and not complete
when the following conversion is complete, the current data is lost and RDERROR is pulsed high.
25–28
DATA[12:15]
DO
Bit 12 to Bit 15 of the Parallel Port Data output bus. These pins are always outputs regardless
of the state of SER/
PAR.
29
BUSY
DO
Busy Output. Transitions HIGH when a conversion is started, and remains HIGH until the
conversion is complete and the data is latched into the on-chip shift register. The falling edge
of BUSY could be used as a data ready clock signal.
30
DGND
P
Must Be Tied to Digital Ground
31
RD
DI
Read Data. When
CS and RD are both LOW, the interface parallel or serial output bus is enabled.
32
CS
DI
Chip Select. When
CS and RD are both LOW, the interface parallel or serial output bus is
enabled.
CS is also used to gate the external serial clock.
33
RESET
DI
Reset Input. When set to a logic HIGH, reset the AD7675. Current conversion if any is aborted.
34
PD
DI
Power-Down Input. When set to a logic HIGH, power consumption is reduced and conver-
sions are inhibited after the current one is completed.
35
CNVST
DI
Start Conversion. If
CNVST is HIGH when the acquisition phase (t
8) is complete, the next
falling edge on
CNVST puts the internal sample/hold into the hold state and initiates a
conversion. This mode is the most appropriate if low sampling jitter is desired. If
CNVST is
LOW when the acquisition phase (t8) is complete, the internal sample/hold is put into the hold
state and a conversion is immediately started.
36
AGND
P
Must Be Tied to Analog Ground
37
REF
AI
Reference Input Voltage
38
REFGND
AI
Reference Input Analog Ground
39
IN–
AI
Differential Negative Analog Input
43
IN+
AI
Differential Positive Analog Input
NOTES
AI = Analog Input
DI = Digital Input
DI/O = Bidirectional Digital
DO = Digital Output
P = Power
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