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부품번호 | AD7949 기능 |
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기능 | 250 kSPS PulSAR ADC | ||
제조업체 | Analog Devices | ||
로고 | |||
전체 30 페이지수
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 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 (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
APPLICATIONS
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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
14-Bit, 8-Channel,
250 kSPS PulSAR ADC
AD7949
FUNCTIONAL BLOCK DIAGRAM
0.5V TO VDD – 0.5V 0.5V TO VDD
0.1µF
10µF
2.3V TO 5.5V
REFIN
REF
VDD
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
COM
BAND GAP
REF
TEMP
SENSOR
AD7949
MUX
14-BIT SAR SPI SERIAL
ADC
INTERFACE
ONE-POLE
LPF
SEQUENCER
GND
1.8V
VIO TO
VDD
CNV
SCK
SDO
DIN
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 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
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 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.
Rev. B
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.
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 ©2008–2009 Analog Devices, Inc. All rights reserved.
AD7949
Parameter
INTERNAL REFERENCE
REF Output Voltage
REFIN Output Voltage7
REF Output Current
Temperature Drift
Line Regulation
Long-Term Drift
Turn-On Settling Time
EXTERNAL REFERENCE
Voltage Range
Current Drain
TEMPERATURE SENSOR
Output Voltage8
Temperature Sensitivity
DIGITAL INPUTS
Logic Levels
VIL
VIH
IIL
IIH
DIGITAL OUTPUTS
Data Format9
Pipeline Delay10
VOL
VOH
POWER SUPPLIES
VDD
VIO
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Standby Current11, 12
Power Dissipation
Energy per Conversion
TEMPERATURE RANGE13
Specified Performance
Conditions/Comments
2.5 V, @ 25°C
4.096 V, @ 25°C
2.5 V, @ 25°C
4.096 V, @ 25°C
VDD = 5 V ± 5%
1000 hours
CREF = 10 μF
REF input
REFIN input (buffered)
250 kSPS, REF = 5 V
@ 25°C
Min
2.490
4.086
0.5
0.5
Typ
2.500
4.096
1.2
2.3
±300
±10
±15
50
5
50
283
1
Max Unit
2.510
4.106
V
V
V
V
μA
ppm/°C
ppm/V
ppm
ms
VDD + 0.3
VDD − 0.5
V
V
μA
mV
mV/°C
−0.3
0.7 × VIO
−1
−1
+0.3 × VIO
VIO + 0.3
+1
+1
V
V
μA
μA
ISINK = +500 μA
ISOURCE = −500 μA
Specified performance
Specified performance
Operating range
VDD and VIO = 5 V, @ 25°C
VDD = 2.5 V, 100 SPS throughput
VDD = 2.5 V, 100 kSPS throughput
VDD = 2.5 V, 200 kSPS throughput
VDD = 5 V, 250 kSPS throughput
VDD = 5 V, 250 kSPS throughput with internal
reference
TMIN to TMAX
VIO − 0.3
2.3
2.3
1.8
−40
50
1.5
1.45
2.9
10.8
13.5
50
0.4 V
V
5.5
VDD + 0.3
VDD + 0.3
2.0
4.0
12.5
15.5
V
V
V
nA
μW
mW
mW
mW
mW
nJ
+85 °C
1 See the Analog Inputs section.
2 The bandwidth is set in the configuration register.
3 LSB means least significant bit. With the 5 V input range, one LSB = 305 μV.
4 See the Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.
5 With VDD = 5 V, unless otherwise noted.
6 All specifications expressed in decibels are referred to a full-scale input FSR and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
7 This is the output from the internal band gap.
8 The output voltage is internal and present on a dedicated multiplexer input.
9 Unipolar mode: serial 14-bit straight binary.
Bipolar mode: serial 14-bit twos complement.
10 Conversion results available immediately after completed conversion.
11 With all digital inputs forced to VIO or GND as required.
12 During acquisition phase.
13 Contact an Analog Devices, Inc., sales representative for the extended temperature range.
Rev. B | Page 4 of 32
4페이지 ABSOLUTE MAXIMUM RATINGS
Table 5.
Parameter
Analog Inputs
INx,1 COM1
REF, REFIN
Supply Voltages
VDD, VIO to GND
VIO to VDD
DIN, CNV, SCK to GND
SDO to GND
Storage Temperature Range
Junction Temperature
θJA Thermal Impedance (LFCSP)
θJC Thermal Impedance (LFCSP)
Rating
GND − 0.3 V to VDD + 0.3 V
or VDD ± 130 mA
GND − 0.3 V to VDD + 0.3 V
−0.3 V to +7 V
−0.3 V to VDD + 0.3 V
−0.3 V to VIO + 0.3 V
−0.3 V to VIO + 0.3 V
−65°C to +150°C
150°C
47.6°C/W
4.4°C/W
1 See the Analog Inputs section.
AD7949
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
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Rev. B | Page 7 of 32
7페이지 | |||
구 성 | 총 30 페이지수 | ||
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