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參數資料
| 型號： | AD7854 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit Sampling ADC(單電源,200kSPS 12位采樣A/D轉換器) |
| 中文描述： | 12位采樣ADC（單電源，速度高達200ksps的12位采樣的A / D轉換器） |
| 文件頁數： | 7/28頁 |
| 文件大小： | 268K |
| 代理商： | AD7854 |
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AD7854/AD7854L
REV. 0
–7–
PIN FUNCT ION DE SCRIPT ION
Pin
Mnemonic
Description
1
CONVST
Convert Start. Logic input. A low to high transition on this input puts the track/hold into its hold
mode and starts conversion. When this input is not used, it should be tied to DV
DD
.
2
RD
Read Input. Active low logic input. Used in conjunction with
CS
and HBEN to read from internal
registers.
3
WR
Write Input. Active low logic input. Used in conjunction with
CS
and HBEN to write to internal registers.
4
CS
Chip Select Input. Active low logic input. T he device is selected when this input is active.
5
REF
IN
/
REF
OUT
Reference Input/Output. T his pin is connected to the internal reference through a series resistor and is the
reference source for the analog-to-digital converter. T he nominal reference voltage is 2.5 V and this appears
at the pin. T his pin can be overdriven by an external reference and can be taken as high as AV
DD
. When
this pin is tied to AV
DD
, then the C
REF1
pin should also be tied to AV
DD
.
6
7
8
AV
DD
AGND
C
REF1
Analog Positive Supply Voltage, +3.0 V to +5.5 V.
Analog Ground. Ground reference for track/hold, reference and DAC.
Reference Capacitor (0.1
μ
F multilayer ceramic). T his external capacitor is used as a charge source for the
internal DAC. T he capacitor should be tied between the pin and AGND.
Reference Capacitor (0.01
μ
F ceramic disc). T his external capacitor is used in conjunction with the on-chip
reference. T he capacitor should be tied between the pin and AGND.
Analog Input. Positive input of the pseudo-differential analog input. Cannot go below AGND or above
AV
DD
at any time, and cannot go below AIN(–) when the unipolar input range is selected.
Analog Input. Negative input of the pseudo-differential analog input. Cannot go below AGND or above
AV
DD
at any time.
High Byte Enable Input. T he AD7854 operates in byte mode only but outputs 12 bits of data during a
read cycle with HBEN low. When HBEN is high, then the high byte of data that is written to or read from
the part is on DB0 to DB7. When HBEN is low, then the lowest byte of data being written to the part is on
DB0 to DB7. If reading from the part with HBEN low, then the lowest 12 bits of data appear on pins DB0
to DB11. T his allows a single read from the ADC or from the control register in a 16-bit bus system.
However, two reads are needed to access the calibration registers. Also, two writes are necessary to write to
any of the registers.
9
C
REF2
10
AIN(+)
11
AIN(–)
12
HBEN
13–21
DB0–DB8
Data Bits 0 to 8. T hree state data I/O pins that are controlled by
CS
,
RD
,
WR
and HBEN. Data output is
straight binary (unipolar mode) or twos complement (bipolar mode).
Digital Supply Voltage, +3.0 V to +5.5 V.
Digital Ground. Ground reference point for digital circuitry.
Data Bits 9 to 11. T hree state data output pins that are controlled by
CS
,
RD
and HBEN. Data output is
straight binary (unipolar mode) or twos complement (bipolar mode). T hese output pins should be tied to
DV
DD
via 100 k
resistors when the AD7854/AD7854L is being interfaced to an 8-bit data bus.
Master Clock Signal for the device (4 MHz for AD7854, 1.8 MHz for AD7854L). Sets the conversion and
calibration times.
Busy Output. T he busy output is triggered high by the falling edge of
CONVST
and remains high until
conversion is completed. BUSY is also used to indicate when the AD7854/AD7854L has completed its on-
chip calibration sequence.
22
23
24–26
DV
DD
DGND
DB9–DB11
27
CLK IN
28
BUSY
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7854AD | 制造商:Analog Devices 功能描述: |
| AD7854AQ | 功能描述:IC ADC 12BIT PARALLEL LP 28-CDIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7854AR | 功能描述:IC ADC 12BIT PARALLEL LP 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7854AR-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT PARALLEL 28SOIC W - Tape and Reel |
| AD7854ARS | 功能描述:IC ADC 12BIT PARALLEL LP 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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