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PDF AD7651 Data sheet ( Hoja de datos )
| Número de pieza | AD7651 | |
| Descripción | Unipolar ADC | |
| Fabricantes | Analog Devices | |
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FEATURES
Throughput: 100 kSPS
16-bit resolution
Analog input voltage range: 0 V to 2.5 V
No pipeline delay
Parallel and serial 5 V/3 V interface
SPI®/QSPITM/MICROWIRETM/DSP compatible
Single 5 V supply operation
Power dissipation
16 mW typ, 160 µW @ 1 kSPS without REF
38 mW typ with REF
48-lead LQFP and 48-lead LFCSP packages
Pin-to-pin compatible with PulSAR ADCs
APPLICATIONS
Data acquisition
Instrumentation
Digital signal processing
Spectrum analysis
Medical instruments
Battery-powered systems
Process control
GENERAL DESCRIPTION
The AD7651 is a 16-bit, 100 kSPS, charge redistribution SAR
analog-to-digital converter that operates from a single 5 V
power supply. The part contains a high speed 16-bit sampling
ADC, an internal conversion clock, internal reference, error
correction circuits, and both serial and parallel system inter-
face ports.
The AD7651 is fabricated using Analog Devices’ high perform-
ance, 0.6 micron CMOS process, with correspondingly low cost,
and is available in a 48-lead LQFP and a tiny 48-lead LFCSP
with operation specified from –40°C to +85°C.
16-Bit 100 kSPS PulSARTM
Unipolar ADC with Reference
AD7651
FUNCTIONAL BLOCK DIAGRAM
REFBUFIN REF REFGND
DVDD DGND
AGND
AVDD
IN
INGND
PDREF
PDBUF
PD
RESET
AD7651
REF
SWITCHED
CAP DAC
SERIAL
PORT
16
CLOCK
PARALLEL
INTERFACE
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CNVST
OVDD
OGND
DATA[15:0]
BUSY
RD
CS
SER/P A R
OB/2 C
BYTESWAP
02964-0-001
Figure 1. Functional Block Diagram
Table 1. PulSAR Selection
Type/kSPS
Pseudo-
Differential
True Bipolar
True
Differential
18-Bit
Multichannel/
Simultaneous
100–250
AD7651
AD7660/AD7661
AD7663
AD7675
AD7678
500–570
AD7650/AD7652
AD7664/AD7666
AD7665
AD7676
AD7679
AD7654
AD7655
800–
1000
AD7653
AD7667
AD7671
AD7677
AD7674
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD7651 is a 100 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
2. Internal Reference.
The AD7651 has an internal reference with a typical
temperature drift of 7 ppm/°C.
3. Single-Supply Operation.
The AD7651 operates from a single 5 V supply. Its power
dissipation decreases with throughput.
4. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V and 5 V logic.
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: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
AD7651
Parameter
DIGITAL INPUTS
Logic Levels
VIL
VIH
IIL
IIH
DIGITAL OUTPUTS
Data Format5
Pipeline Delay6
VOL
VOH
POWER SUPPLIES
Specified Performance
AVDD
DVDD
OVDD
Operating Current
AVDD8
AVDD9
DVDD10
OVDD10
Power Dissipation without REF10
Power Dissipation with REF10
TEMPERATURE RANGE11
Specified Performance
Conditions
ISINK = 1.6 mA
ISOURCE = –500 µA
100 kSPS Throughput
With Reference and Buffer
Reference and Buffer Alone
100 kSPS Throughput
1 kSPS Throughput
100 kSPS Throughput
TMIN to TMAX
Min Typ Max
Unit
–0.3 +0.8 V
2.0 DVDD + 0.3 V
–1 +1 µA
–1 +1 µA
OVDD – 0.6
0.4
4.75 5 5.25
4.75 5 5.25
2.7 5.257
6.2
3
1.5
18
16 25
160
38 45
–40 +85
V
V
V
V
V
mA
mA
mA
µA
mW
µW
mW
°C
1See Analog Input section.
2LSB means least significant bit. With the 0 V to 2.5 V input range, 1 LSB is 38.15 µV.
3See Definitions of Specifications section. These specifications do not include the error contribution from the external reference.
4All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
5Parallel or Serial 16-Bit.
6Conversion results are available immediately after completed conversion.
7 The max should be the minimum of 5.25 V and DVDD + 0.3 V.
8 With REF, PDREF and PDBUF are LOW; without REF, PDREF and PDBUF are HIGH.
9 With PDREF, PDBUF LOW and PD HIGH.
10 Tested in Parallel Reading Mode
11Consult factory for extended temperature range.
Rev. 0 | Page 4 of 28
5 Page 
AD7651
Pin No.
43
45
46
47
Mnemonic
IN
TEMP
REFBUFIN
PDREF
48 PDBUF
Type1
AI
AO
AI/O
DI
DI
Description
Primary Analog Input with a Range of 0 V to 2.5 V.
Temperature Sensor Voltage Output.
Reference Input Voltage. The reference output and the reference buffer input.
This pin allows the choice of internal or external voltage references. When LOW, the on-chip
reference is turned on. When HIGH, the internal reference is switched off and an external reference
must be used.
This pin allows the choice of buffering an internal or external reference with the internal buffer.
When LOW, the buffer is selected. When HIGH, the buffer is switched off.
1AI = Analog Input; AI/O = Bidirectional Analog; AO = Analog Output; DI = Digital Input; DI/O = Bidirectional Digital; DO = Digital Output; P = Power.
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AD7651.PDF ] | |
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