參數資料
| 型號： | AD7944BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/28頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 2.5MSPS 20LFCSP |
| 標準包裝： | 1 |
| 系列： | PulSAR® |
| 位數： | 14 |
| 采樣率（每秒）： | 2.5M |
| 數據接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 33mW |
| 電壓電源： | 模擬和數字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 20-LFCSP-VQ |
| 包裝： | 托盤 |
| 輸入數目和類型： | 1 個偽差分，單極 |
| 產品目錄頁面： | 780 (CN2011-ZH PDF) |
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14-Bit, 2.5 MSPS, PulSAR
15.5 mW ADC in LFCSP
AD7944
Rev. A
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rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
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Tel: 781.329.4700
Fax: 781.461.3113
2009-2010 Analog Devices, Inc. All rights reserved.
FEATURES
14-bit resolution with no missing codes
Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
Low power dissipation
15.5 mW at 2.5 MSPS, with external reference
28 mW at 2.5 MSPS, with internal reference
INL: ±0.25 LSB typical, ±1.0 LSB maximum
SNR
84 dB, with on-chip reference
84.5 dB, with external reference
4.096 V internal reference: typical drift of ±10 ppm/°C
Pseudo differential analog input voltage range
0 V to VREF with VREF up to 5.0 V
Allows use of any input range
No pipeline delay
Logic interface: 1.8 V/2.5 V/2.7 V
Serial interface: SPI-/QSPI-/MICROWIRE-/DSP-compatible
Ability to daisy-chain multiple ADCs with busy indicator
20-lead, 4 mm × 4 mm LFCSP (QFN)
APPLICATIONS
Battery-powered equipment
Communications
ATE
Data acquisition systems
Medical instruments
APPLICATION DIAGRAM
0V
TO
VREF
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
AD7944
GND
REF
AVDD,
DVDD
VIO
BVDD
5V
2.5V
1.8V
TO
2.7V
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE
INTERFACE:
SPI, CS,
DAISY CHAIN
(TURBO = LOW)
TURBO
10F
IN+
IN–
04658-
001
Figure 1.
GENERAL DESCRIPTION
The AD7944 is a 14-bit, 2.5 MSPS successive approximation
analog-to-digital converter (SAR ADC). It contains a low power,
high speed, 14-bit sampling ADC, an internal conversion clock,
an internal reference (and buffer), error correction circuits, and
a versatile serial interface port. On the rising edge of CNV, the
AD7944 samples an analog input, IN+, between 0 V and VREF
with respect to a ground sense, IN. The AD7944 features a
very high sampling rate turbo mode (TURBO high) and a
reduced power normal mode (TURBO low) for low power
applications where the power is scaled with the throughput.
In normal mode (TURBO low), the SPI-compatible serial inter-
face also features the ability, using the SDI input, to daisy-chain
several ADCs on a single 3-wire bus and provide an optional busy
indicator. The serial interface is compatible with 1.8 V, 2.5 V,
and 2.7 V supplies using the separate VIO supply.
The AD7944 is available in a 20-lead LFCSP with operation
specified from 40°C to +85°C.
Table 1. MSOP, LFCSP, 14-/16-/18-Bit PulSAR ADCs1
Type
100 kSPS
250 kSPS
400 kSPS to 500 kSPS
≥1000 kSPS
ADC Driver
14-Bit
AD79443
16-Bit
18-Bit
1
See www.analog.com for the latest selection of PulSAR ADCs and ADC drivers.
2
Pin-for-pin compatible with all other parts marked with this endnote.
3
The AD7944, AD7985, and AD7986 are pin-for-pin compatible.
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| AD7944BCPZ-RL7 | 功能描述:IC ADC 14B 2.5MSPS PULSR 20LFCSP 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 |
| AD7945 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+3.3 V/+5 V Multiplying 12-Bit DACs |
| AD7945AN-B | 功能描述:IC DAC 12BIT MULT PARALL 20-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數:18 數據接口:串行 轉換器數目:3 電壓電源:模擬和數字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數目和類型:* 采樣率（每秒）:* |
| AD7945ANZ-B | 功能描述:IC DAC 12BIT MULT PARALL 20DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:47 系列:- 設置時間:2µs 位數:14 數據接口:并聯 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
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