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參數資料
| 型號： | AD7891AS-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System |
| 中文描述： | 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PQFP44 |
| 封裝： | PLASTIC, MO-112-AA-1, MQFP-44 |
| 文件頁數： | 7/20頁 |
| 文件大小： | 173K |
| 代理商： | AD7891AS-2 |
AD7891
–7–
REV. A
PIN FUNCTION DESCRIPTIONS
Mnemonic
Description
V
INXA
, V
INXB
Analog Input Channels. The AD7891 contains eight pairs of analog input channels. Each channel con-
tains two input pins to allow a number of different input ranges to be used with the AD7891. There are
two possible input voltage ranges on the AD7891-1. The
±
5V input range is selected by connecting the
input voltage to both V
INXA
and V
INXB
, while the
±
10V input range is selected by applying the input
voltage to V
INXA
and connecting V
INXB
to AGND. The AD7891-2 has three possible input ranges. The
0 V to +2.5V input range is selected by connecting the analog input voltage to both V
INXA
and V
INXB
; the
0 V to +5V input range is selected by applying the input voltage to V
INXA
and connecting V
INXB
to AGND
while the
±
2.5V input range is selected by connecting the analog input voltage to V
INXA
and connecting
V
INXB
to REFIN (provided this REF IN voltage comes from a low impedance source). The channel to be
converted is selected by the A2, A1 and A0 bits of the control register. In the parallel interface mode,
these bits are available as three data input lines (DB3 to DB5) in a parallel write operation while in the
serial interface mode, these three bits are accessed via the DATA IN line in a serial write operation. The
multiplexer has guaranteed break-before-make operation.
Positive supply voltage, +5 V
±
5%.
Analog Ground. Ground reference for track/hold, comparator and DAC.
Digital Ground. Ground reference for digital circuitry.
Standby Mode Input. TTL-compatible input which is used to put the device into the power save or
standby mode. The
STANDBY
input is high for normal operation and low for standby operation.
Voltage Reference Output/Input. The part can either be used with its own internal reference or with an
external reference source. The on-chip +2.5V reference voltage is provided at this pin. When using this
internal reference as the reference source for the part, REFOUT should be decoupled to REFGND with
a 0.1
μ
F disc ceramic capacitor. The output impedance of the reference source is typically 2k
. When
using an external reference source as the reference voltage for the part, the reference source should be
connected to this pin. This overdrives the internal reference and provides the reference source for the
part. The reference pin is buffered on-chip but must be able to sink or source current through this 2k
resistor to the output of the on-chip reference. The nominal reference voltage for correct operation of the
AD7891 is +2.5 V.
Reference Ground. Ground reference for the part’s on-chip reference buffer. The REF OUT pin of the
part should be decoupled with a 0.1
μ
F capacitor to this REF GND pin. If the AD7891 is used with an
external reference, the external reference should also be decoupled to this pin. The REFGND pin should
be connected to the AGND pin or the system’s AGND plane.
Convert Start. Edge-triggered logic input. A low to high transition on this input puts the track/hold into
hold and initiates conversion. When changing channels on the part, sufficient time should be given for
multiplexer settling and track/hold acquisition between the channel change and the rising edge of
CONVST
.
End-of-Conversion. Active low logic output indicating converter status. The end of conversion is signified
by a low-going pulse on this line. The duration of this
EOC
pulse is nominally 80ns.
Interface Mode. Control input which determines the interface mode for the part. With this pin at a logic
low, the AD7891 is in its serial interface mode; with this pin at a logic high, the device is in its parallel
interface mode.
No Connect. The two NC pins on the device can be left unconnected. If they are to be connected to a
voltage it should be to ground potential. To ensure correct operation of the AD7891, neither of the NC
pins should be connected to a logic high potential.
V
DD
AGND
DGND
STANDBY
REF OUT/REFIN
REF GND
CONVST
EOC
MODE
NC
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7891ASZ-1 | 功能描述:IC DAS 12BIT 8CH HI-SPD 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Data Converter Basics 標準包裝:1 系列:- 類型:電機控制 分辨率（位）:12 b 采樣率（每秒）:1M 數據接口:串行，并聯 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應商設備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
| AD7891ASZ-1 | 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7891ASZ-1REEL | 功能描述:IC DAS 12BIT 8CH 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7891ASZ-2 | 功能描述:IC DAS 12BIT 8CH 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7891ASZ-2REEL | 功能描述:IC DAS 12BIT 8CH 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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