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參數資料
型號: AD7886KD
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
中文描述: 1-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP28
封裝: SIDE BRAZED, CERAMIC, DIP-28
文件頁數: 6/16頁
文件大小: 400K
代理商: AD7886KD
AD7886
–6–
REV. B
this amplifier typically by 20 MHz which is much greater than
the Nyquist limit of the ADC; as a result, it can be used for
undersampling applications. The track-and-hold amplifier ac-
quires the input signal to 12-bit accuracy in less than 333 ns.
The overall throughput time is equal to the conversion time
plus the track/ hold amplifier acquisition time, which is 1.333
μ
s
for the AD7886.
The operation of the track/hold amplifier is essentially transpar-
ent to the user. The track-to-hold transition occurs at the start
of conversion on the falling edge of
CONVST
. The conversion
procedure does not start until the rising edge of
CONVST
. The
width of the
CONVST
pulse low time determines the track-to
hold settling time. The track/hold reverts back to the track
mode at the end of conversion when
BUSY
has returned high.
+
TO
COMPARATORS
VIN1
VIN2
0 TO 5V
0 TO 5V ANALOG INPUT RANGE
3.5k
10k
10k
0 TO 10V ANALOG INPUT RANGE
+
TO
COMPARATORS
VIN1
VIN2
0 TO 10V
3.5k
10k
10k
+5V
±
5V ANALOG INPUT RANGE
±
5V
+
TO
COMPARATORS
VIN1
VIN2
3.5k
10k
10k
Figure 3. Analog Input Range Configurations
ANALOG INPUT RANGES
The AD7886 has three user selectable analog input ranges: 0 V
to 5 V, 0 V to 10 V and
±
5 V. Figure 3 shows how to configure
the two analog inputs (VIN1 and VIN2) for these ranges.
UNIPOLAR OPERATION
Figure 4 shows a typical unipolar circuit for the AD7886. The
ideal input/output characteristic is shown in Figure 5. The
designed code transitions occur on integer multiples of 1 LSB.
The output code is natural binary with 1 LSB = FS/4096. FS is
either +5 V or +10 V, depending on how the analog inputs are
configured.
AD7886*
SUM
+
AD586
V
OUT
+V
IN
GND
+V
C1
10
μ
F
C2
0.1
μ
F
AD707
VIN1
VIN2**
AGND
V
SS
V
DD
AIN
0 TO 5V
OR
0 TO 10V
5V
+
5REF
+
5V
+
V
REF
3.5V
5V
*ADDITIONAL PINS OMITTED FOR CLARITY
**0 TO 5V RANGE: CONNECT VIN2 TO VIN1
0 TO 10V RANGE: CONNECT VIN2 TO AGND
Figure 4. Unipolar Operation
00...000
00...001
00...010
00...011
11...111
11...110
11...101
11...100
1
2
3
FS
OUTPUT
CODE
VIN, INPUT VOLTAGE (LSBS)
FS – 1LSB
1LSB =4FS
Figure 5. Ideal Input/Output Transfer Characteristic for
Unipolar Operation
相關PDF資料
PDF描述
AD7886KP LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
AD7886TD LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
AD7886JD LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
AD7887 +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
AD7887AR +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
相關代理商/技術參數
參數描述
AD7886KP-REEL 制造商:Analog Devices 功能描述:
AD7887AR 功能描述:IC ADC 12BIT 2CH SRL 8-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:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7887ARM 功能描述:IC ADC 12BIT 2CH SRL 8-MSOP 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:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7887ARM-REEL 制造商:Analog Devices 功能描述:ADC Single SAR 125ksps 12-bit Serial 8-Pin MSOP T/R
AD7887ARM-REEL7 功能描述:IC ADC 12BIT 2CH SRL 8-MSOP 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:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
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