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參數(shù)資料
| 型號： | AD7942BCPZRL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 250KSPS 10-LFCSP |
| 標準包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 1.25mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤，CSP |
| 供應商設備封裝： | 10-LFCSP-WD（3x3） |
| 包裝： | 標準包裝 |
| 輸入數(shù)目和類型： | 1 個偽差分，單極 |
| 配用： | EVAL-AD7942CB-ND - BOARD EVALUATION FOR AD7942 |
| 其它名稱： | AD7942BCPZRL7DKR |
AD7942
Rev. B | Page 13 of
24
THEORY OF OPERATION
SW+
MSB
4096C
IN+
LSB
COMP
CONTROL
LOGIC
SWITCHES CONTROL
BUSY
OUTPUT CODE
CNV
REF
GND
IN–
4C
2C
C
8192C
SW–
MSB
4096C
LSB
4C
2C
C
8192C
04
65
7-
0
21
Figure 21. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7942 is a fast, low power, single-supply, precise 14-bit
ADC using successive approximation architecture.
The AD7942 is capable of converting 250,000 samples per
second (250 kSPS) and powers down between conversions.
When operating at 100 SPS, for example, it consumes typically
1.25 μW with a 2.5 V power supply, which is ideal for battery-
powered applications.
The AD7942 provides the user with an on-chip track-and-hold
and does not exhibit any pipeline delay or latency, making it
ideal for multiple, multiplexed channel applications.
The AD7942 is specified from 2.3 V to 5.5 V and can be inter-
faced to a 1.8 V, 2.5 V, 3.3 V, or 5 V digital logic. It is housed in
a 10-lead MSOP or a tiny 10-lead QFN (LFCSP) that is space
saving, yet allows flexible configurations. It is pin-for-pin-
compatible with the 16-bit ADC AD7685.
CONVERTER OPERATION
The AD7942 is a successive approximation ADC based on a
charge redistribution DAC. Figure 21 shows the simplified
schematic of the ADC. The capacitive DAC consists of two
identical arrays of 14 binary weighted capacitors, which are
connected to the two comparator inputs.
During the acquisition phase, terminals of the array tied to the
input of the comparator are connected to GND via SW+ and
SW. All independent switches are connected to the analog
inputs. Thus, the capacitor arrays are used as sampling
capacitors and acquire the analog signal on the IN+ and IN
inputs. When the acquisition phase is complete and the CNV
input goes high, a conversion phase is initiated. When the
conversion phase starts, SW+ and SW are opened first. The
two capacitor arrays are then disconnected from the inputs and
connected to the GND input. Therefore, the differential voltage
between the inputs (IN+ and IN) 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 GND and REF, the
comparator input varies by binary weighted voltage steps
(VREF/2, VREF/4 ... VREF/16,384). The control logic toggles these
switches, starting with the MSB, to bring the comparator back
into a balanced condition. After the completion of this process,
the part returns to the acquisition phase and the control logic
generates the ADC output code and a busy signal indicator.
Because the AD7942 has an on-board conversion clock, the
serial clock is not required for the conversion process.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD7942BCPZRL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 250 kSPS PulSAR, Pseudo Differential ADC in MSOP/QFN |
| AD7942BRM | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 14-bit Serial 10-Pin MSOP Tube 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
| AD7942BRMRL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 250 kSPS PulSAR ADC in MSOP/QFN |
| AD7942BRM-RL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 14-bit Serial 10-Pin MSOP T/R |
| AD7942BRMZ | 功能描述:IC ADC 14BIT 250KSPS 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)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(shù)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 |
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