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PDF AD7656A Data sheet ( Hoja de datos )
| Número de pieza | AD7656A | |
| Descripción | Simultaneous Sampling Bipolar 16-Bit ADC | |
| Fabricantes | Analog Devices | |
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Data Sheet
250 kSPS, 6-Channel, Simultaneous
Sampling, Bipolar 16-Bit ADC
AD7656A
FEATURES
6 independent analog-to-digital converters (ADCs)
True bipolar analog inputs
Pin-/software-selectable ranges: ±10 V or ±5 V
Fast throughput rate: 250 kSPS
iCMOS® process technology
Low power: 140 mW at 250 kSPS with 5 V supplies
Wide input bandwidth
86.5 dB SNR at 50 kHz input frequency
On-chip reference and reference buffers
Parallel, serial, and daisy-chain interface modes
High speed serial interface
Serial peripheral interface (SPI)/QSPI™/MICROWIRE®/DSP
compatible
Power-down mode: 100 mW maximum
64-lead LQFP
Improved power supply sequencing (PSS) robustness
APPLICATIONS
Power line monitoring systems
Instrumentation and control systems
Multi-axis positioning systems
FUNCTIONAL BLOCK DIAGRAM
VDD CONVST A CONVST B CONVST C AVCC DVCC
REF
V1 T/H
BUF
CLK
OSC
CONTROL
LOGIC
16-BIT SAR
OUTPUT
DRIVERS
V2 T/H
V3 T/H
BUF
16-BIT SAR
16-BIT SAR
V4 T/H
V5 T/H
BUF
16-BIT SAR
16-BIT SAR
OUTPUT
DRIVERS
OUTPUT
DRIVERS
OUTPUT
DRIVERS
V6 T/H
VSS
16-BIT SAR
AD7656A
AGND DGND
Figure 1.
CS
SER/PAR/SEL
VDRIVE
STBY
DB8/DOUT A
SCLK
DB9/DOUT B
DB10/DOUT C
DATA/
CONTROL
LINES
RD
WR/REFEN/DIS
GENERAL DESCRIPTION
The AD7656A1 contains six 16-bit, fast, low power, successive
approximation analog-to-digital converters (ADCs) all in the
one package that is designed on the iCMOS® process (industrial
CMOS). iCMOS is a process combining high voltage silicon
with submicron CMOS and complementary bipolar technologies.
It enables the development of a wide range of high performance
analog ICs, capable of 33 V operation in a footprint that no
previous generation of high voltage devices could achieve. Unlike
analog ICs using conventional CMOS processes, iCMOS
components can accept bipolar input signals while providing
increased performance, which dramatically reduces power
consumption and package size.
The AD7656A features throughput rates of up to 250 kSPS. It
contains wide bandwidth (12 MHz), track-and-hold amplifiers
that can handle input frequencies up to 12 MHz.
The conversion process and data acquisition are controlled
using CONVST x signals and an internal oscillator. Three
CONVST x pins (CONVST A, CONVST B, and CONVST C)
allow independent, simultaneous sampling of the three ADC
pairs. The AD7656A has a high speed parallel and serial interface,
allowing the device to interface with microprocessors or digital
signal processors (DSPs). In serial interface mode, the AD7656A
has a daisy-chain feature that allows multiple ADCs to connect
to a single serial interface. The AD7656A can accommodate
true bipolar input signals in the ±4 × VREF range and ±2 × VREF
range. The AD7656A also contains an on-chip 2.5 V reference.
Multifunction pin names may be referenced by their relevant
function only.
PRODUCT HIGHLIGHTS
1. Six 16-bit, 250 kSPS ADCs on board.
2. Six true bipolar, high impedance analog inputs.
3. Parallel and high speed serial interfaces.
1 Protected by U.S. Patent No. 6,731,232.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD7656A
Parameter
LOGIC INPUTS
Input High Voltage (VINH)
Input Low Voltage (VINL)
Input Current (IIN)
Input Capacitance (CIN)2
LOGIC OUTPUTS
Output High Voltage (VOH)
Output Low Voltage (VOL)
Floating State Leakage Current
Floating State Output Capacitance2
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time1, 2
Throughput Rate
POWER REQUIREMENTS
VDD Range
VSS Range
AVCC
DVCC
VDRIVE
ITOTAL4
Normal Mode (Static)
Min Typ
0.7 × VDRIVE
VDRIVE − 0.2
6
−6
4.75
4.75
2.7
Normal Mode (Operational)
ISS (Operational)
IDD (Operational)
Partial Power-Down Mode
Full Power-Down Mode (STBY Pin)
Power Dissipation
Normal Mode (Static)
Normal Mode (Operational)
Partial Power-Down Mode
Full Power-Down Mode (STBY Pin)
1 See the Terminology section.
2 Sample tested during initial release to ensure compliance.
3 Multifunction pin names may be referenced by their relevant function only.
4 Includes IAVCC, IVDD, IVSS, IVDRIVE, and IDVCC.
Data Sheet
Max Unit
0.3 × VDRIVE
±1
10
V
V
µA
pF
V
0.2 V
±1 µA
10 pF
Test Conditions/Comments
Typically 10 nA, VIN = 0 V or VDRIVE
ISOURCE = 200 µA
ISINK = 200 µA
3.1
550
250
16.5
−16.5
5.25
5.25
5.25
28
26
0.25
0.25
7
80
143
140
35
100
µs
ns
kSPS
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mW
mW
mW
mW
Parallel interface mode only
For the 4 × VREF range, VDD = 11 V to 16.5 V
For the 4 × VREF range, VSS = −11 V to −16.5 V
Digital inputs = 0 V or VDRIVE
AVCC = DVCC = VDRIVE = 5.25 V,
VDD = 16.5 V, VSS = −16.5 V
fSAMPLE = 250 kSPS, AVCC = DVCC = VDRIVE =
5.25 V, VDD = 16.5 V, VSS = −16.5 V
VSS = −16.5 V, fSAMPLE = 250 kSPS
VDD = 16.5 V, fSAMPLE = 250 kSPS
AVCC = DVCC = VDRIVE = 5.25 V, VDD = 16.5 V,
VSS = −16.5 V
SCLK on or off, AVCC = DVCC = VDRIVE =
5.25 V, VDD = 16.5 V, VSS = −16.5 V
AVCC = DVCC = VDRIVE = 5.25 V, VDD = 16.5 V,
VSS = −16.5 V
fSAMPLE = 250 kSPS
Rev. 0 | Page 4 of 28
5 Page 
AD7656A
TYPICAL PERFORMANCE CHARACTERISTICS
0
VDD/VSS = ±15V
–20
AVCC/DVCC/VDRIVE = +5V
INTERNAL REFERENCE
±10V RANGE
–40 TA = 25°C
fS = 250kSPS
fIN = 50kHz
–60 SNR = +87.33dB
SINAD = +87.251dB
–80 THD = –104.32dB
SFDR = –104.13dB
–100
–120
–140
–160
0
25 50 75
FREQUENCY (kHz)
Figure 4. FFT for ±10 V Range
100
125
0
–20
–40
–60
–80
–100
–120
–140
–160
0
VDD/VSS = ±12V
AVCC/DVCC/VDRIVE = +5V
INTERNAL REFERENCE
±5V RANGE
TA = 25°C
fS = 250kSPS
fIN = 50kHz
SNR = +86.252dB
SINAD = +86.196dB
THD = –105.11dB
SFDR = –98.189dB
25 50 75
FREQUENCY (kHz)
Figure 5. FFT for ±5 V Range
100
125
2.0
AVCC/DVCC/VDRIVE = +5V
1.5
VDD/VSS = ±12V
fSAMPLE = 250kSPS
2 × VREF RANGE
1.0 INL WCP = 0.64LSB
INL WCN = –0.76LSB
0.5
0
–0.5
–1.0
–1.5
–2.0
0
10k 20k 30k 40k 50k 60k 65535
CODE
Figure 6. Typical INL
Data Sheet
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
AVCC/DVCC/VDRIVE = +5V
VDD/VSS = ±12V
fSAMPLE = 250kSPS
2 × VREF RANGE
DNL WCP = 0.81LSB
DNL WCN = –0.57LSB
–2.0
0 10k 20k 30k 40k 50k 60k 65535
CODE
Figure 7. Typical DNL
90
AVCC/DVCC/VDRIVE = +5.25V
VDD/VSS = ±16.5V
±10V RANGE
85
AVCC/DVCC/
VDRIVE = +5V
80
AVCC/DVCC/
VDRIVE = +4.75 V
VDD/VSS = ±12V
±5V RANGE
VDD/VSS = ±10V
±10V RANGE
75
AVCC/DVCC/
70
VDRIVE = +5V
VDD/VSS = ±5.25V
±5V RANGE
65 fSAMPLE = 250kSPS
INTERNAL REFERENCE
TA = 25°C
60
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 8. SINAD vs. Analog Input Frequency
1000
–60
–70
–80
–90
–100
–110
fSAMPLE = 250kSPS
INTERNAL REFERENCE
TA = 25°C
AVCC/DVCC/VDRIVE = +5V
VDD/VSS = ±5.25V
±5V RANGE
AVCC/DVCC/
VDRIVE = +4.75V
VDD/VSS = ±10V
±10V RANGE
AVCC/DVCC/
VDRIVE = +5V
VDD/VSS = ±12V
±5V RANGE
AVCC/DVCC/
VDRIVE = +5.25V
VDD/VSS = ±16.5V
±10V RANGE
–120
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 9. THD vs. Analog Input Frequency
1000
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AD7656A.PDF ] | |
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