3 mW, 100 kSPS,
16-Bit ADC in 6-Lead SOT-23
AD7680
FEATURES
Fast throughput rate: 100 kSPS
Specified for V
DD
of 2.5 V to 5.5 V
Low power
3 mW typ at 100 kSPS with 2.5 V supply
3.9 mW typ at 100 kSPS with 3 V supply
16.7 mW typ at 100 kSPS with 5 V supply
Wide input bandwidth
86 dB SNR at 10 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI®/QSPI™/μWire/DSP compatible
Standby mode: 0.5 μA max
6-Lead SOT-23 and 8-Lead MSOP packages
FUNCTIONAL BLOCK DIAGRAM
V
DD
V
IN
T/H
16-BIT SUCCESSIVE
APPROXIMATION
ADC
SCLK
AD7680
CONTROL
LOGIC
SDATA
CS
03643-0-001
GND
Figure 1.
Table 1. MSOP/SOT-23 16-Bit PulSAR ADC
Type/kSPS
True Differential
Pseudo Differential
Unipolar
100 kSPS
AD7684
AD7683
AD7680
250 kSPS
AD7687
AD7685
500 kSPS
AD7688
AD7686
APPLICATIONS
Battery-powered systems:
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Remote data acquisition systems
High speed modems
Optical sensors
GENERAL DESCRIPTION
The AD7680 is a 16-bit, fast, low power, successive
approximation ADC. The part operates from a single 2.5 V to
5.5 V power supply and features throughput rates up to 100 kSPS.
The part contains a low noise, wide bandwidth track-and-hold
amplifier that can handle input frequencies in excess of 7 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of CS and the conversion is also initiated at this
point. There are no pipeline delays associated with the part.
The AD7680 uses advanced design techniques to achieve very
low power dissipation at fast throughput rates. The reference for
the part is taken internally from V
DD
, which allows the widest
dynamic input range to the ADC. Thus, the analog input range
for this part is 0 V to V
DD
. The conversion rate is determined by
the SCLK frequency.
PRODUCT HIGHLIGHTS
1.
2.
3.
First 16-bit ADC in a SOT-23 package.
High throughput with low power consumption.
Flexible power/serial clock speed management. The
conversion rate is determined by the serial clock, allowing
the conversion time to be reduced through the serial clock
speed increase. This allows the average power consumption
to be reduced when a power-down mode is used while not
converting. The part also features a shutdown mode to
maximize power efficiency at lower throughput rates.
Power consumption is 0.5 μA max when in shutdown.
Reference derived from the power supply.
No pipeline delays.
4.
5.
This part features a standard successive approximation ADC
with accurate control of the sampling instant via a CS input and
once-off conversion control.
Rev. A
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© 2004-2011 Analog Devices, Inc. All rights reserved.
AD7680* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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DESIGN RESOURCES
•
AD7680 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DOCUMENTATION
Application Notes
•
AN-214: Ground Rules for High Speed Circuits
•
AN-931: Understanding PulSAR ADC Support Circuitry
•
AN-932: Power Supply Sequencing
Data Sheet
•
AD7680: 3 mW, 100 kSPS,16-Bit ADC in 6-Lead SOT-23
Data Sheet
Product Highlight
•
[NO TITLE FOUND] Product Highlight
•
8- to 18-Bit SAR ADCs ... From the Leader in High
Performance Analog
•
Lowest-Power 16-Bit ADC Optimizes Portable Designs
(eeProductCenter, 10/4/2006)
DISCUSSIONS
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SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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REFERENCE MATERIALS
Technical Articles
•
MS-2210: Designing Power Supplies for High Speed ADC
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AD7680
TABLE OF CONTENTS
Specifications..................................................................................... 2
Specifications..................................................................................... 4
Timing Specifications....................................................................... 6
Absolute Maximum Ratings............................................................ 7
ESD Caution .................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Terminology ...................................................................................... 9
Typical Performance Characteristics ........................................... 10
Circuit Information ........................................................................ 12
Converter Operation .................................................................. 12
Analog Input ............................................................................... 12
ADC Transfer Function ................................................................. 13
Typical Connection Diagram ................................................... 13
Digital Inputs .......................................................................... 13
Modes of Operation ....................................................................... 14
Normal Mode.............................................................................. 14
Power-Down Mode .................................................................... 15
Power vs. Throughput Rate ........................................................... 16
Serial Interface ................................................................................ 17
AD7680 to ADSP-218x .............................................................. 18
Application Hints ........................................................................... 19
Grounding and Layout .............................................................. 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 21
REVISION HISTORY
5/11—Rev. 0 to Rev. A
Deleted the Evaluating the AD7680 Performance Section ...... 19
Changes to Ordering Guide .......................................................... 21
1/04—Revision 0: Initial Version
Rev. A | Page 2 of 24
AD7680
SPECIFICATIONS
1
Table 2. V
DD
= 4.5 V to 5.5 V, f
SCLK
= 2.5 MHz, f
SAMPLE
= 100 kSPS, unless otherwise noted; T
A
= T
MIN
to T
MAX
, unless otherwise noted
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise + Distortion (SINAD)
2
Signal-to-Noise Ratio (SNR)
2
Total Harmonic Distortion (THD)
2
Peak Harmonic or Spurious Noise (SFDR)
2
Intermodulation Distortion (IMD)
2
Second-Order Terms
Third-Order Terms
Aperture Delay
Aperture Jitter
Full Power Bandwidth
DC ACCURACY
No Missing Codes
Integral Nonlinearity
2
Offset Error
2
Gain Error
2
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN2, 3
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Floating-State Leakage Current
Floating-State Output Capacitance
2, 3
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
V
DD
I
DD
Normal Mode (Static)
Normal Mode (Operational)
Full Power-Down Mode
Power Dissipation
4
Normal Mode (Operational)
Full Power-Down
1
2
A, B Versions
1
83
85
84
86
−97
−95
−94
−100
20
30
8
2.2
15
±4
±1.68
±0.038
0 to V
DD
±0.3
30
2.8
0.4
±0.3
10
Unit
dB min
dB typ
dB min
dB typ
dB typ
dB typ
dB typ
dB typ
ns max
ps typ
MHz typ
MHz typ
Bits typ
LSB typ
mV max
% FS max
V
μA max
pF typ
V min
V max
μA max
pF max
Test Conditions/Comments
f
IN
= 10 kHz sine wave
@ −3 dB
@ −0.1 dB
Typically 10 nA, V
IN
= 0 V or V
DD
V
DD
− 0.2
V min
0.4
V max
±0.3
μA max
10
pF max
Straight (Natural) Binary
8
9.6
1.5
400
100
4.5/5.5
5.2
4.8
0.5
26.4
2.75
μs max
μs max
μs max
ns max
kSPS
V min/V max
mA max
mA max
μA max
mW max
μW max
I
SOURCE
= 200 μA
I
SINK
= 200 μA
20 SCLK cycles with SCLK at 2.5 MHz
24 SCLK cycles with SCLK at 2.5 MHz
Sine wave input ≤ 10 kHz
See the Serial Interface section
Digital I/P
S
= 0 V or V
DD
SCLK on or off. V
DD
= 5.5 V
f
SAMPLE
= 100 kSPS. V
DD
= 5.5 V; 3.3 mA typ
SCLK on or off. V
DD
= 5.5 V
V
DD
= 5.5 V
f
SAMPLE
= 100 kSPS
Temperature range as follows: B Version: −40°C to +85°C.
See the Terminology section.
3
Sample tested during initial release to ensure compliance.
4
See the Power vs. Throughput Rate section.
Rev. A | Page 3 of 24
AD7680
SPECIFICATIONS
1
Table 3. V
DD
= 2.5 V to 4.096 V, f
SCLK
= 2.5 MHz, f
SAMPLE
= 100 kSPS, unless otherwise noted; T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise + Distortion (SINAD)
2
A Version
1
83
82
86
84
83
86
−98
−95
−94
−100
20
30
7
5
2
1.6
14
±3.5
±3
±1.25
±1.098
±0.038
0 to V
DD
±0.3
30
2.4
0.4
±0.3
10
B Version
1
83
82
86
84
83
86
−98
−99
−94
−100
10
30
7
5
2
1.6
15
±3.5
±3
±1.25
±1.098
±0.038
0 to V
DD
±0.3
30
2.4
0.4
±0.3
10
Unit
dB min
dB min
dB typ
dB min
dB min
dB typ
dB typ
dB typ
dB typ
dB typ
ns max
ps typ
MHz typ
MHz typ
MHz typ
MHz typ
Bits min
LSB max
LSB max
mV max
mV max
% FS max
V
μA max
pF typ
V min
V max
μA max
pF max
V min
V max
μA max
pF max
Test Conditions/Comments
f
IN
= 10 kHz sine wave
V
DD
= 4.096 V
V
DD
= 2.5 V to 3.6 V
V
DD
= 4.096 V
V
DD
= 2.5 V to 3.6 V
Signal-to-Noise Ratio (SNR)
2
Total Harmonic Distortion (THD)
2
Peak Harmonic or Spurious Noise (SFDR)
2
Intermodulation Distortion (IMD)
2
Second-Order Terms
Third-Order Terms
Aperture Delay
Aperture Jitter
Full Power Bandwidth
@ −3 dB; V
DD
= 4.096 V
@ −3 dB; V
DD
= 2.5 V to 3.6 V
@ −0.1 dB; V
DD
= 4.096 V
@ −0.1 dB; V
DD
= 2.5 V to 3.6 V
DC ACCURACY
No Missing Codes
Integral Nonlinearity
2
Offset Error
2
Gain Error
2
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN2, 3
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Floating-State Leakage Current
Floating-State Output Capacitance
2, 3
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
V
DD
= 4.096 V
V
DD
= 2.5 V to 3.6 V
V
DD
= 4.096 V
V
DD
= 2.5 V to 3.6 V
Typically 10 nA, V
IN
= 0 V or V
DD
V
DD
− 0.2
V
DD
− 0.2
0.4
0.4
±0.3
±0.3
10
10
Straight (Natural) Binary
8
9.6
1.5
400
100
8
9.6
1.5
400
100
I
SOURCE
= 200 μA
I
SINK
= 200 μA
μs max
μs max
μs max
ns max
kSPS
20 SCLK cycles with SCLK at 2.5 MHz
24 SCLK cycles with SCLK at 2.5 MHz
Full-scale step input
Sine wave input ≤ 10 kHz
See the Serial Interface section
Rev. A | Page 4 of 24
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