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| 型号： | EVAL-AD7944EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7944 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 2.5M |
| 数据接口： | SPI?、QSPI?、MICROWIRE? 和 DSP |
| 输入范围： | 0 ~ 5 V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7944 |
| 已供物品： | 板 |
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14-Bit, 2.5 MSPS, PulSAR
15.5 mW ADC in LFCSP
AD7944
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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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