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參數(shù)資料
| 型號： | AD7651ASTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 100KSPS 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 100k |
| 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）： | 45mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 2 個偽差分，單極 |
| 產(chǎn)品目錄頁面： | 778 (CN2011-ZH PDF) |
| 配用： | EVAL-AD7651CBZ-ND - BOARD EVALUATION FOR AD7651 |
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AD7651
CIRCUIT INFORMATION
SWA
COMP
SWB
IN
REF
REFGND
LSB
MSB
32,768C
INGND
16,384C
4C
2C
C
65,536C
CONTROL
LOGIC
SWITCHES
CONTROL
BUSY
OUTPUT
CODE
02964-0-005
CNVST
Figure 20. ADC Simplified Schematic
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 SWA. 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, SWA and SWB 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
(VREF/2, VREF/4, …VREF/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
shows a simplified sche-
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.
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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)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 |
| AD7652ACP | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:16-BIT 500KSPS SAR UNIPOLAR ADC W/ REF - Bulk 制造商:Analog Devices 功能描述:16BIT SAR ADC REF 7652 LFSCP-48 |
| AD7652ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R |
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