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| 型號： | AD7986BCPZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/28頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 2MSPS SAR 20LFCSP |
| 產(chǎn)品培訓(xùn)模塊： | Motor Control |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 2M |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 34mW |
| 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： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
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18-Bit, 2 MSPS PulSAR
15 mW ADC in LFCSP (QFN)
AD7986
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
2009–2011 Analog Devices, Inc. All rights reserved.
FEATURES
18-bit resolution with no missing codes
Throughput: 2 MSPS (TURBO = high), 1.5 MSPS (TURBO = low)
Low power dissipation
15 mW at 2 MSPS, with external reference
26 mW at 2 MSPS with internal reference
INL: ±1 LSB typical, ±2.5 LSB maximum
SNR
95.5 dB, with on-chip reference
97.0 dB, with external reference
4.096 V internal reference: typical drift of 10 ppm/°C
True differential analog input voltage range: ±VREF
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
Data acquisition systems
Medical instruments
Seismic data acquisition systems
APPLICATION DIAGRAM
2.7nF
15
V–
0V
TO
VREF
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
V+
2.7nF
15
V–
V+
IN–
AD7986
IN+
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
VREF
TO
0V
GND1
0
7
95
6-
0
01
Figure 1.
GENERAL DESCRIPTION
The AD7986 is an 18-bit, 2 MSPS successive approximation,
analog-to-digital converter (ADC). It contains a low power,
high speed, 18-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
AD7986 samples the voltage difference between the IN+ and
IN pins. The voltages on these pins usually swing in opposite
phases between 0 V and VREF. It 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
interface 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. It is compatible with 1.8 V, 2.5 V, and 2.7 V
using the separate VIO supply.
The AD7986 is available in a 20-lead LFCSP (QFN) with
operation specified from 40°C to +85°C.
Table 1. MSOP, LFCSP (QFN) 14-/16-/18-Bit PulSAR ADCs
Type
100 kSPS
250 kSPS
400 kSPS to 500 kSPS
≥1000 kSPS
ADC Driver
14-Bit
16-Bit
18-Bit
1 Pin-for-pin compatible.
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