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參數(shù)資料
| 型號(hào)： | AD7886JP |
| 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, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 400K |
| 代理商： | AD7886JP |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7886JP-REEL | 功能描述:IC ADC 12BIT SAMPLING HS 28-PLCC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 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）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
| 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(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)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(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)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 |
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