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AD7949SCPZ-EP-RL7 其他数据使用手册 - ADI（亚德诺）
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ADI（亚德诺）
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AD转换器
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LFCSP-20
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ANALOG DEVICES AD7949SCPZ-EP-RL7 模数转换器, 八路, 14 bit, 250 kSPS, 单, 2.3 V, 5.5 V, LFCSP
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AD7949SCPZ-EP-RL7数据手册
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14-Bit, 8-Channel,
250 kSPS PulSAR ADC
AD7949-EP
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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 ©2011 Analog Devices, Inc. All rights reserved.
FEATURES
14-bit resolution with no missing codes
8-channel multiplexer with choice of inputs
Unipolar single-ended
Differential (GND sense)
Pseudobipolar
Throughput: 250 kSPS
INL/DNL: ±0.5/±0.25 LSB typical
SINAD: 85 dB @ 20 kHz
THD: −100 dB @ 20 kHz
Analog input range: 0 V to V
REF
with V
REF
up to VDD
Multiple reference types
Internal selectable 2.5 V or 4.096 V
External buffered (up to 4.096 V)
External (up to VDD)
Internal temperature sensor (TEMP)
Channel sequencer, selectable 1-pole filter, busy indicator
No pipeline delay, SAR architecture
Single-supply 2.3 V to 5.5 V operation with
1.8 V to 5.5 V logic interface
Serial interface compatible with SPI, MICROWIRE,
QSPI, and DSP
Power dissipation
2.9 mW @ 2.5 V/200 kSPS
10.8 mW @ 5 V/250 kSPS
Standby current: 50 nA
20-lead 4 mm × 4 mm LFCSP package
Supports defense and aerospace applications (AQEC
standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Multichannel system monitoring
Battery-powered equipment
Medical instruments: ECG/EKG
Mobile communications: GPS
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control
FUNCTIONAL BLOCK DIAGRAM
AD7949-EP
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
1.8V
TO
VDD
2.3V TO 5.5V
SEQUENCER
SPI SERIAL
INTERFACE
MUX
14-BIT SAR
ADC
BAND GAP
REF
TEMP
SENSOR
REFIN
IN0
IN1
IN4
IN5
IN6
IN7
IN3
IN2
COM
0.5V TO VDD
10µF
ONE-POLE
LPF
0.5V TO VDD – 0.5V
0.1µF
09822-001
Figure 1.
Table 1. Multichannel 14-/16-Bit PulSAR® ADCs
Type Channels 250 kSPS 500 kSPS ADC Driver
14-Bit 8 AD7949 ADA4841-x
16-Bit 4 AD7682 ADA4841-x
16-Bit 8 AD7689 AD7699 ADA4841-x
GENERAL DESCRIPTION
The AD7949-EP is an 8-channel, 14-bit, charge redistribution
successive approximation register (SAR) analog-to-digital
converter (ADC) that operates from a single power supply, VDD.
The AD7949-EP contains all components for use in a
multichannel, low power data acquisition system, including a
true 14-bit SAR ADC with no missing codes; an 8-channel, low
crosstalk multiplexer that is useful for configuring the inputs as
single-ended (with or without ground sense), differential, or
bipolar; an internal low drift reference (selectable 2.5 V or
4.096 V) and buffer; a temperature sensor; a selectable one-pole
filter; and a sequencer that is useful when channels are
continuously scanned in order.
The AD7949-EP uses a simple SPI interface for writing to the
configuration register and receiving conversion results. The SPI
interface uses a separate supply, VIO, which is set to the host
logic level. Power dissipation scales with throughput.
The AD7949-EP is housed in a tiny 20-lead LFCSP with
operation specified from −55°C to +125°C. Full details about
this enhanced product are available in the AD7949 data sheet,
which should be consulted in conjunction with this data sheet.
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