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PDF AD7656A-1 Data sheet ( Hoja de datos )
| Número de pieza | AD7656A-1 | |
| Descripción | 16-Bit ADC | |
| Fabricantes | Analog Devices | |
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Data Sheet
250 kSPS, 6-Channel, Simultaneous
Sampling, Bipolar, 16-Bit ADC
AD7656A-1
FEATURES
Pin and software compatible with the AD7656A featuring
reduced decoupling requirements
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
High noise performance with wide bandwidth
88 dB SNR at 10 kHz input frequency
On-chip reference and reference buffers
High speed parallel, serial, and daisy-chain interface modes
High speed serial interface
Serial peripheral interface (SPI)/QSPI™/MICROWIRE®/DSP
compatible
Power-down mode: 315 µW maximum
64-lead LQFP
Built-in power supply sequencing (PSS) robustness solution
APPLICATIONS
Power line monitoring and measuring systems
Instrumentation and control systems
Multiaxis positioning systems
FUNCTIONAL BLOCK DIAGRAM
VDD CONVST A CONVST B CONVST C AVCC DVCC
REF
CLK
OSC
CONTROL
LOGIC
V1 T/H
BUF
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-1
AGND DGND
Figure 1.
CS
SER/PAR SEL
VDRIVE
STBY
DB8/DOUT A
DB6/SCLK
DB9/DOUT B
DB10/DOUT C
DATA/
CONTROL
LINES
RD
WR/REFEN/DIS
GENERAL DESCRIPTION
The AD7656A-11 is a reduced decoupling pin- and software-
compatible version of AD7656A. The AD7656A-1 contains six
16-bit, fast, low power successive approximation ADCs in a
package 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-1 features throughput rates of to 250 kSPS. It
contains wide bandwidth (4.5 MHz), track-and-hold amplifiers
that can handle input frequencies up to 4.5 MHz.
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.
The conversion process and data acquisition are controlled
using the 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-1 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-1 has a daisy-chain feature that allows multiple
ADCs to connect to a single serial interface. The AD7656A-1
can accommodate true bipolar input signals in the ±4 × VREF
range and the ±2 × VREF range. The AD7656A-1 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. High speed parallel and serial interfaces.
4. Reduced decoupling requirements and reduced bill of
materials cost compared with the AD7656A.
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-1
Data Sheet
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
Max Unit
0.7 × VDRIVE
0.3 × VDRIVE
±10
10
V
V
µA
pF
VDRIVE − 0.2
0.2
±10
10
Twos complement
V
V
µA
pF
3.1 µs
550 ns
250 kSPS
6 16.5 V
−6
−16.5
V
4.75 5.25 V
4.75 5.25 V
2.7 5.25 V
18 mA
Normal Mode (Operational)
26 mA
ISS (Operational)
IDD (Operational)
Partial Power-Down Mode
0.25 mA
0.25 mA
7 mA
Full Power-Down Mode (STBY Pin)
60 µA
Power Dissipation
Normal Mode (Static)
Normal Mode (Operational)
Partial Power-Down Mode
Full Power-Down Mode (STBY Pin)
94 mW
140 mW
40 mW
315 µW
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.
Test Conditions/Comments
Typically 10 nA, VIN = 0 V or VDRIVE
ISOURCE = 200 µA
ISINK = 200 µA
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-1
TYPICAL PERFORMANCE CHARACTERISTICS
0
–20
–40
–60
–80
–100
VDD/VSS = ±15V
AVCC/DVCC/VDRIVE = 5V
±10V RANGE
INTERNAL REFERENCE
TA = 25°C
fSAMPLE = 250kSPS
fIN = 10kHz
SNR = 88.44dB
SINAD = 88.43dB
THD = –111.66dB
–120
–140
–160
–180
0
20 40 60 80 100
FREQUENCY (kHz)
Figure 4. FFT for ±10 V Range (VDD/VSS = ±15 V)
120
0
–20
–40
–60
–80
–100
VDD/VSS = ±12V
AVCC/DVCC/VDRIVE = 5V
±5V RANGE
INTERNAL REFERENCE
TA = 25°C
fSAMPLE = 250kSPS
fIN = 10kHz
SNR = 88.25dB
SINAD = 88.24dB
THD = –112.46dB
–120
–140
–160
–180
0
20 40 60 80 100
FREQUENCY (kHz)
Figure 5. FFT for ±5 V Range (VDD/VSS = ±12 V)
120
2.0
VDD/VSS = ±12V
TA = –40°C
AVCC/DVCC/VDRIVE = 5V INL WCP = 0.97LSB
1.5 fSAMPLE = 250kSPS
INL WCN = –0.72LSB
2 × VREF RANGE
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
10k 20k 30k 40k 50k
CODE
Figure 6. Typical INL
60k 65535
Data Sheet
2.0
VDD/VSS = ±12V
TA = –40°C
1.5
AVCC/DVCC/VDRIVE = 5V
fSAMPLE = 250kSPS
DNL WCP = 0.61LSB
DNL WCN = –0.82LSB
2 × VREF RANGE
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
10k 20k 30k 40k 50k
CODE
Figure 7. Typical DNL
60k 65535
90
fSAMPLE = 250kSPS
TA = 25°C
89 INTERNAL REFERENCE
88
±10V RANGE
VDD/VSS = ±12V
AVCC/DVCC/VDRIVE = 5V
87 ±5V RANGE
VDD/VSS = ±12V
86 AVCC/DVCC/VDRIVE = 5V
85
84
83
10
ANALOG INPUT FREQUENCY (kHz)
Figure 8. SINAD vs. Analog Input Frequency
100
–80
fSAMPLE = 250kSPS
TA = 25°C
–85 INTERNAL REFERENCE
–90
–95
–100
–105
±10V RANGE
VDD/VSS = ±12V
AVCC/DVCC/VDRIVE = 5V
–110
–115
10
±5V RANGE
VDD/VSS = ±12V
AVCC/DVCC/VDRIVE = 5V
100
ANALOG INPUT FREQUENCY (kHz)
Figure 9. THD vs. Analog Input Frequency
Rev. 0 | Page 10 of 28
11 Page | ||
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