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PDF AD7689 Data sheet ( Hoja de datos )
| Número de pieza | AD7689 | |
| Descripción | 16-Bit - 4-Channel/8-Channel - 250 kSPS PulSAR ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
16-bit resolution with no missing codes
4-channel (AD7682)/8-channel (AD7689) multiplexer with
choice of inputs
Unipolar single ended
Differential (GND sense)
Pseudobipolar
Throughput: 250 kSPS
INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)
Dynamic range: 93.8 dB
SINAD: 92.5 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
3.5 mW @ 2.5 V/200 kSPS
12 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
16-Bit, 4-Channwewwl/.D8at-aSChehet4aU.nconmel,
250 kSPS PulSAR ADC
AD7682/AD7689
FUNCTIONAL BLOCK DIAGRAM
0.5V TO 4.096V
0.1µF
0.5V TO VDD
22µF
2.7V TO 5V
REFIN REF VDD
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
COM
BAND GAP
REF
TEMP
SENSOR
AD7682/
AD7689
MUX
16-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® 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 AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge
redistribution successive approximation register (SAR) analog-
to-digital converters (ADCs) that operate from a single power
supply, VDD.
The AD7682/AD7689 contain all components for use in a
multichannel, low power data acquisition system, including a
true 16-bit SAR ADC with no missing codes; a 4-channel
(AD7682) or 8-channel (AD7689), low crosstalk multiplexer
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 AD7682/AD7689 use 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.
Each AD7682/AD7689 is housed in a tiny 20-lead LFCSP with
operation specified from −40°C to +85°C.
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.
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.
1 page  
wwwA.DDa7ta6Sh8e2et/4AU.Dco7m689
Parameter
POWER SUPPLIES
VDD
VIO
Standby Current11, 12
Power Dissipation
Energy per Conversion
TEMPERATURE RANGE13
Specified Performance
Conditions/Comments
AD7682B/AD7689B
Min Typ Max
Unit
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
2.3
2.3
1.8
5.5 V
VDD + 0.3 V
VDD + 0.3 V
50 nA
1.7 μW
1.75 2.1
mW
3.5 4.1
mW
12.5 15.9
mW
15.5 19.2
mW
50 nJ
TMIN to TMAX
−40 +85 °C
1 See the Analog Inputs section.
2 The bandwidth is set with the configuration register
3 LSB means least significant bit. With the 5 V input range, one LSB is 76.3 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 16-bit straight binary.
Bipolar mode: serial 16-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. 0 | Page 5 of 28
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V to 5.5 V, VREF = 2.5 V to 5 V, VIO = 2.3 V to VDD
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
0
16,384
32,768
CODES
49,152
65,536
Figure 6. Integral Nonlinearity vs. Code, VREF = VDD = 5 V
200k
180k
160k
140k
120k
135,326
124,689
σ = 0.50
VREF = VDD = 5V
100k
80k
60k
40k
20k
0 0 487
619
0
7FFA 7FFB 7FFC 7FFD 7FFE 7FFF
CODE IN HEX
0
8000
0
8001
0
8002
Figure 7. Histogram of a DC Input at Code Center
0
–20 VffSINR=E=F251=09Vk.9SDkPDHSz= 5V
–40 SNR = 92.9dB
SINAD = 92.4dB
–60
THD = –102dB
SFDR = 103dB
SECOND HARMONIC = –111dB
–80 THIRD HARMONIC = –104dB
–100
–120
–140
–160
–180
0
25 50
75 100
FREQUENCY (kHz)
Figure 8. 20 kHz FFT, VREF = VDD = 5 V
125
wwwA.DDa7ta6Sh8e2et/4AU.Dco7m689
1.5
1.0
0.5
0
–0.5
–1.0
0
16,384
32,768
CODES
49,152
65,536
Figure 9. Differential Nonlinearity vs. Code, VREF = VDD = 5 V
160k
140k
135,207
σ = 0.78
VREF = VDD = 2.5V
120k
100k
80k
63,257
60k 51,778
40k
20k 6649
1 78
0
7FFB 7FFC 7FFD 7FFE 7FFF 8000
CODE IN HEX
4090
8001
60
8002
1
8003
Figure 10. Histogram of a DC Input at Code Center
0
–20 VffsINR=E=2F01=09kV.9SDkPDHSz= 2.5V
–40 SNR = 88.0dB
SINAD = 87.0dB
–60
THD = –89dB
SFDR = 89dB
SECOND HARMONIC = –105dB
–80 THIRD HARMONIC = –90dB
–100
–120
–140
–160
–180
0
25 50 75
FREQUENCY (kHz)
Figure 11. 20 kHz FFT, VREF = VDD = 2.5 V
100
Rev. 0 | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AD7689.PDF ] | |
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