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| 型號： | EVAL-AD7687SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7687 |
| 標準包裝： | 1 |
| 系列： | PulSAR® |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±VREF |
| 在以下條件下的電源（標準）： | 4mW @ 5V，100kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7687 |
| 已供物品： | 板 |
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16-Bit, 1.5 LSB INL, 250 kSPS PulSAR
Differential ADC in MSOP/QFN
Data Sheet
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
2005–2011 Analog Devices, Inc. All rights reserved.
FEATURES
16-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
Dynamic range: 96.5 dB
S/(N + D): 95.5 dB @ 20 kHz
THD: 118 dB @ 20 kHz
True differential analog input range
±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 2.3 V to 5.5 V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI/QSPI/MICROWIRE/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS, and
1.4 μW @ 2.5 V/100 SPS
Standby current: 1 nA
10-lead MSOP (MSOP-8 size) and
3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
Pin-for-pin compatible with AD7685, AD7686, and AD7688
APPLICATIONS
Battery-powered equipment
Data acquisitions
Instrumentation
Medical instruments
Process controls
CODE
INL
(
L
SB)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
0
16384
32768
49152
65535
02972-001
POSITIVE INL = +0.32LSB
NEGATIVE INL = –0.41LSB
Figure 1. Integral Nonlinearity vs. Code
APPLICATION DIAGRAM
AD7687
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
1.8V TO VDD
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
0.5V TO 5V
2.5 TO 5V
VREF
0
02972-002
VREF
0
Figure 2.
Table 1. MSOP, QFN (LFCSP)/SOT-23 16-Bit PulSAR ADC
Type
100 kSPS
250 kSPS
500 kSPS
True Differential
Pseudo
Differential/Unipolar
Unipolar
GENERAL DESCRIPTION
The AD7687 is a 16-bit, charge redistribution, successive
approximation, analog-to-digital converter (ADC) that operates
from a single power supply, VDD, between 2.3 V to 5.5 V. It
contains a low power, high speed, 16-bit sampling ADC with no
missing codes, an internal conversion clock, and a versatile
serial interface port. The part also contains a low noise, wide
bandwidth, short aperture delay track-and-hold circuit. On the
CNV rising edge, it samples the voltage difference between IN+
and IN pins. The voltages on these pins usually swing in
opposite phase between 0 V to REF. The reference voltage, REF,
is applied externally and can be set up to the supply voltage.
Its power scales linearly with throughput.
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 provides an optional BUSY indicator. It is
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
supply VIO.
The AD7687 is housed in a 10-lead MSOP or a 10-lead QFN
(LFCSP) with operation specified from 40°C to +85°C.
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