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16-Bit, 500 kSPS PulSAR
®
Dual,
2-Channel, Simultaneous Sampling ADC
AD7654
FEATURES
Dual, 16-bit, 2-channel simultaneous sampling ADC
16-bit resolution with no missing codes
Throughput:
500 kSPS (normal mode)
444 kSPS (impulse mode)
INL: ±3.5 LSB max (±0.0053% of full scale)
SNR: 89 dB typ @ 100 kHz
THD: −100 dB @ +100 kHz
Analog input voltage range: 0 V to 5 V
No pipeline delay
Parallel and serial 5 V/3 V interface
SPI®/QSPI™/MICROWIRE™/DSP compatible
Single 5 V supply operation
Power dissipation:
120 mW typical
2.6 mW @ 10 kSPS
Packages:
48-lead low profile quad flat package (LQFP)
48-lead lead frame chip scale package (LFCSP)
Low cost
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND
REFGND REFx
DVDD DGND
OVDD
SERIAL
PORT 16
SWITCHED
CAP DAC
OGND
D[15:0]
SER/PAR
EOC
BUSY
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
PARALLEL
INTERFACE
CS
RD
A/B
03057-001
INA1
INAN
INA2
A0
INB1
INBN
INB2
PD
RESET
TRACK/HOLD
×2
MUX
MUX
MUX
AD7654
IMPULSE
CNVST
BYTESWAP
Figure 1.
Table 1. PulSAR Selection
Type/kSPS
Pseudo
Differential
100 to 250
AD7660/
AD7661
AD7653
AD7663
AD7675
AD7678
500 to 570
AD7650/
AD7652
AD7664/
AD7666
AD7665
AD7676
AD7679
AD7654
800 to 1000
AD7667
>1000
APPLICATIONS
AC motor control
3-phase power control
4-channel data acquisition
Uninterrupted power supplies
Communications
True Bipolar
True Differential
18-Bit
Multichannel/
Simultaneous
AD7671
AD7677
AD7674
AD7655
AD7621
AD7623
AD7641
GENERAL DESCRIPTION
The AD7654 is a low cost, simultaneous sampling, dual-
channel, 16-bit, charge redistribution SAR, analog-to-digital
converter that operates from a single 5 V power supply. It
contains two low noise, wide bandwidth, track-and-hold
amplifiers that allow simultaneous sampling, a high speed
16-bit sampling ADC, an internal conversion clock, error
correction circuits, and both serial and parallel system interface
ports. Each track-and-hold has a multiplexer in front to provide
a 4-channel input ADC. The A0 multiplexer control input
allows the choice of simultaneously sampling input pairs
INA1/INB1 (A0 = low) or INA2/INB2 (A0 = high). The part
features a very high sampling rate mode (normal) and, for low
power applications, a reduced power mode (impulse) where the
power is scaled with the throughput. Operation is specified
from −40°C to +85°C.
PRODUCT HIGHLIGHTS
1.
Simultaneous Sampling.
The AD7654 features two sample-and-hold circuits that
allow simultaneous sampling. It provides inputs for four
channels.
Fast Throughput.
The AD7654 is a 500 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
Superior INL and No Missing Codes.
The AD7654 has a maximum integral nonlinearity of
3.5 LSB with no missing 16-bit codes.
Single-Supply Operation.
The AD7654 operates from a single 5 V supply. In impulse
mode, its power dissipation decreases with throughput.
Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V and 5 V logic.
2.
3.
4.
5.
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.
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: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
AD7654
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Terminology .................................................................................... 11
Typical Performance Characteristics ........................................... 12
Application Information................................................................ 14
Circuit Information.................................................................... 14
Modes of Operation ................................................................... 14
Transfer Functions...................................................................... 14
Typical Connection Diagram ................................................... 16
Analog Inputs.............................................................................. 16
Input Channel Multiplexer........................................................ 16
Driver Amplifier Choice ........................................................... 16
Voltage Reference Input ............................................................ 17
Power Supply............................................................................... 17
Power Dissipation....................................................................... 17
Conversion Control ................................................................... 18
Digital Interface.......................................................................... 18
Parallel Interface......................................................................... 18
Serial Interface ............................................................................ 20
Master Serial Interface............................................................... 20
Slave Serial Interface .................................................................. 22
Microprocessor Interfacing....................................................... 24
SPI Interface (ADSP-219x) ....................................................... 24
Application Hints ........................................................................... 25
Layout .......................................................................................... 25
Evaluating the AD7654 Performance ...................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
REVISION HISTORY
11/05—Rev. A to Rev. B
Changes to General Description .................................................... 1
Changes to Timing Specifications .................................................. 5
Changes to Figure 16...................................................................... 13
Changes to Figure 18...................................................................... 15
Added Table 8.................................................................................. 17
Changes to Figure 24...................................................................... 19
Changes to Figure 29...................................................................... 21
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 26
11/04—Rev. 0 to Rev. A
Changes to Figure 7........................................................................ 12
Changes to Figure 18...................................................................... 15
Changes to Figure 19...................................................................... 16
Changes to Voltage Reference Input Section .............................. 17
Changes to Conversion Control Section..................................... 18
Changes to Digital Interface Section ........................................... 18
Updated Outline Dimensions...................................................... 25
11/02—Revision 0: Initial Version
Rev. B | Page 2 of 28
AD7654
SPECIFICATIONS
AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter
RESOLUTION
ANALOG INPUT
Voltage Range
Common-Mode Input Voltage
Analog Input CMRR
Input Current
Input Impedance
1
THROUGHPUT SPEED
Complete Cycle
Throughput Rate
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
2
No Missing Codes
Transition Noise
Full-Scale Error
4
Full-Scale Error Drift
4
Unipolar Zero Error
4
Unipolar Zero Error Drift
4
Power Supply Sensitivity
AC ACCURACY
Signal-to-Noise
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-Noise and Distortion
Conditions
Min
16
0
−0.1
55
45
Typ
Max
Unit
Bits
V
V
dB
μA
V
INx
– V
INxN
V
INxN
f
IN
= 100 kHz
500 kSPS throughput
2 V
REF
+0.5
In normal mode
In normal mode
In impulse mode
In impulse mode
0
0
−3.5
16
2
500
2.25
444
+3.5
0.7
±0.25
±2
±0.8
0.8
μs
kSPS
μs
kSPS
LSB
3
Bits
LSB
% of FSR
ppm/°C
% of FSR
ppm/°C
LSB
dB
5
dB
dB
dB
dB
dB
dB
dB
MHz
ns
ps
ps rms
ns
V
μA
T
MIN
to T
MAX
T
MIN
to T
MAX
AVDD = 5 V ±5%
f
IN
= 20 kHz
f
IN
= 100 kHz
f
IN
= 100 kHz
f
IN
= 100 kHz
f
IN
= 20 kHz
f
IN
= 100 kHz
f
IN
= 100 kHz, −60 dB Input
f
IN
= 100 kHz
88
±0.5
±0.25
87.5
Channel-to-Channel Isolation
−3 dB Input Bandwidth
SAMPLING DYNAMICS
Aperture Delay
Aperture Delay Matching
Aperture Jitter
Transient Response
REFERENCE
External Reference Voltage Range
External Reference Current Drain
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
90
89
105
−100
90
88.5
30
−92
10
2
30
5
Full-scale step
2.3
500 kSPS throughput
2.5
180
250
AVDD/2
−0.3
+2.0
−1
−1
+0.8
DVDD + 0.3
+1
+1
V
V
μA
μA
Rev. B | Page 3 of 28
AD7654
Parameter
DIGITAL OUTPUTS
Data Format
6
Pipeline Delay
7
V
OL
V
OH
POWER SUPPLIES
Specified Performance
AVDD
DVDD
OVDD
Operating Current
9
AVDD
DVDD
OVDD
Power Dissipation
Conditions
Min
Typ
Max
Unit
I
SINK
= 1.6 mA
I
SOURCE
= −500 μA
0.4
OVDD − 0.2
V
V
4.75
4.75
2.7
500 kSPS throughput
5
5
5.25
5.25
5.25
8
V
V
V
mA
mA
μA
mW
mW
mW
°C
500 kSPS throughput
9
10 kSPS throughput
10
444 kSPS throughput
10
T
MIN
to T
MAX
−40
15.5
8.5
100
120
2.6
114
135
125
+85
TEMPERATURE RANGE
11
Specified Performance
1
2
See the Analog Inputs section.
Linearity is tested using endpoints, not best fit.
3
LSB means least significant bit. Within the 0 V to 5 V input range, one LSB is 76.294 μV.
4
See the Terminology section. These specifications do not include the error contribution from the external reference.
5
All specifications in dB are referred to as full-scale input, FS; tested with an input signal at 0.5 dB below full scale unless otherwise specified.
6
Parallel or serial 16-bit.
7
Conversion results are available immediately after completed conversion.
8
The maximum should be the minimum of 5.25 V and DVDD + 0.3 V.
9
In normal mode; tested in parallel reading mode.
10
In impulse mode; tested in parallel reading mode.
11
Consult sales for extended temperature range.
Rev. B | Page 4 of 28
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