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AD7949BCPZRL7 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD7949BCPZRL7
Szczegółowy opis  14-Bit, 8-Channel, 250 kSPS PulSAR ADC
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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14-Bit, 8-Channel,
250 kSPS PulSAR ADC
AD7949
Rev. A
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
©2008 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 LSB typical
SINAD: 85 dB @ 20 kHz
THD: 100 dB @ 20 kHz
Analog input range: 0 V to VREF with VREF 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
Channel sequencer, selectable 1-pole filter, busy indicator
No pipeline delay, SAR architecture
Single-supply 2.7 V to 5.5 V operation with
1.8 V to 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
APPLICATIONS
Battery-powered equipment
Medical instruments: ECG/EKG
Mobile communications: GPS
Personal digital assistants
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control
FUNCTIONAL BLOCK DIAGRAM
AD7949
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
1.8V
TO
VDD
2.7V TO 5V
SEQUENCER
SPI SERIAL
INTERFACE
MUX
16-BIT SAR
ADC
BAND GAP
REF
TEMP
SENSOR
REFIN
IN0
IN1
IN4
IN5
IN6
IN7
IN3
IN2
COM
0.5V TO VDD
22µF
0.5V TO 4.096V
0.1µF
ONE-POLE
LPF
Figure 1.
Table 1. Multichannel 14-/16-Bit PulSAR® ADC
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 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 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 multi-
plexer 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 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 is housed in a tiny 20-lead LFCSP with operation
specified from −40°C to +85°C.


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