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參數資料
| 型號： | AD7651AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit 100 kSPS PulSAR Unipolar ADC with Reference |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | MS-026BBC, LQFP-48 |
| 文件頁數： | 15/28頁 |
| 文件大小： | 709K |
| 代理商： | AD7651AST |
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AD7651
CIRCUIT INFORMATION
SW
A
COMP
SW
B
IN
REF
REFGND
LSB
MSB
32,768C
INGND
16,384C
4C
2C
C
C
65,536C
CONTROL
LOGIC
SWITCHES
CONTROL
BUSY
OUTPUT
CODE
02964-0-005
CNVST
Figure 20. ADC Simplified Schematic
igure 20
The AD7651 is a very fast, low power, single supply, precise
16-bit analog-to-digital converter (ADC).
During the acquisition phase, the common terminal of the array
tied to the comparator's positive input is connected to AGND
via SW
A
. All independent switches are connected to the analog
input IN. Thus, the capacitor array is used as a sampling
capacitor and acquires the analog signal on IN. Similarly, the
dummy capacitor acquires the analog signal on INGND.
The AD7651 provides the user with an on-chip track/hold,
successive approximation ADC that does not exhibit any
pipeline or latency, making it ideal for multiple multiplexed
channel applications.
When CNVST goes LOW, a conversion phase is initiated. When
the conversion phase begins, SW
A
and SW
B
are opened. The
capacitor array and dummy capacitor are then disconnected
from the inputs and connected to REFGND. Therefore, the
differential voltage between IN and INGND captured at the end
of the acquisition phase is applied to the comparator inputs,
causing the comparator to become unbalanced. By switching
each element of the capacitor array between REFGND and REF,
the comparator input varies by binary weighted voltage steps
(V
REF
/2, V
REF
/4, …V
REF
/65536). The control logic toggles these
switches, starting with the MSB, to bring the comparator back
into a balanced condition.
The AD7651 can be operated from a single 5 V supply and can
be interfaced to either 5 V or 3 V digital logic. It is housed in
either a 48-lead LQFP or a 48-lead LFCSP that saves space and
allows flexible configurations as either a serial or parallel inter-
face. The AD7651 is pin-to-pin compatible with PulSAR ADCs.
CONVERTER OPERATION
The AD7651 is a successive-approximation ADC based on a
charge redistribution DAC. F
matic of the ADC. The capacitive DAC consists of an array of 16
binary weighted capacitors and an additional LSB capacitor. The
comparator’s negative input is connected to a dummy capacitor
of the same value as the capacitive DAC array.
shows a simplified sche-
After this process is completed, the control logic generates the
ADC output code and brings the BUSY output LOW.
Rev. 0 | Page 15 of 28
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7651ASTRL | 制造商:Analog Devices 功能描述: |
| AD7651ASTZ | 功能描述:IC ADC 16BIT 100KSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7651ASTZ | 制造商:Analog Devices 功能描述:16BIT SAR ADC REF 7651 LQFP48 |
| AD7651ASTZRL | 功能描述:IC ADC 16BIT UNIPOLAR 48LFCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 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 |
| AD7652 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit 1 MSPS SAR Unipolar ADC with Ref |
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