16-Bit, 1 MSPS PulSAR ADC in MSOP
AD7980-EP
Enhanced Product
APPLICATION DIAGRAM EXAMPLE
16-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
4 mW at 1 MSPS (VDD only)
7 mW at 1 MSPS (total)
70 μW at 10 kSPS
INL: ±0.6 LSB typical, ±1.5 LSB maximum
SINAD: 91 dB @ 10 kHz
THD: −114 dB @ 10 kHz
Pseudo differential analog input range
0 V to VREF with VREF between 2.5 V to 5.5 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V
logic interface
Proprietary serial interface
SPI/QSPI/MICROWIRE™/DSP compatible
Daisy-chain multiple ADCs and busy indicator
Supports defense and aerospace applications (AQEC)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
10-lead MSOP
Military temperature range: −55°C to +125°C
2.5V TO 5V
2.5V
VIO
REF VDD
0 TO VREF
IN+
IN–
1.8V TO 5.0V
SDI
AD7980-EP
SCK
SDO
GND
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
CNV
09304-001
FEATURES
Figure 1.
GENERAL DESCRIPTION
The AD7980-EP1 is a 16-bit, successive approximation, analogto-digital converter (ADC) that operates from a single power
supply, VDD. It contains a low power, high speed, 16-bit
sampling ADC and a versatile serial interface port. On the CNV
rising edge, it samples an analog input IN+ between 0 V to REF
with respect to a ground sense IN−. The reference voltage, REF,
is applied externally and can be set independent of the supply
voltage, VDD. Its power scales linearly with throughput.
The SPI-compatible serial interface also features the ability,
using the SDI input, to daisy-chain several ADCs on a single,
3-wire bus and provides an optional busy indicator. It is
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
supply VIO.
The AD7980-EP is housed in a 10-lead MSOP with operation
specified from −55°C to +125°C.
APPLICATIONS
Battery-powered equipment
Communications
ATE
Data acquisitions
Medical instruments
1
Protected by U.S. Patent 6,703,961.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADC
Type
18-Bit
100 kSPS
AD7989-11
250 kSPS
AD76911
16-Bit
AD7680
AD7683
AD7684
AD7988-11
AD7940
AD76851
AD76871
AD7694
14-Bit
1
AD79421
400 kSPS to 500 kSPS
AD76901
AD7989-51
AD76861
AD76881
AD76931
AD7988-51
AD79461
≥1000 kSPS
AD79821
AD79841
AD79801
AD79831
Pin-for-pin compatible.
Rev. A
Document Feedback
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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 ©2010–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
AD7980-EP
Enhanced Product
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................6
Applications ....................................................................................... 1
ESD Caution...................................................................................6
Application Diagram Example........................................................ 1
Pin Configurations and Function Descriptions ............................7
General Description ......................................................................... 1
Typical Performance Characteristics ..............................................8
Revision History ............................................................................... 2
Outline Dimensions ....................................................................... 12
Specifications..................................................................................... 3
Ordering Guide .......................................................................... 12
Timing Specifications....................................................................... 5
REVISION HISTORY
7/15—Rev. 0 to Rev. A
Changes to Product Title, Features Section, and Table 1 ............ 1
Added Patent Note, Note 1 .............................................................. 1
Changes to Table 2 ............................................................................ 3
Changes to Table 3 ............................................................................ 4
Changes to Table 6 ............................................................................ 7
Changes to Figure 11, Figure 12, Figure 14, Figure 15 ................ 9
Changes to Figure 17, Figure 20, Figure 21 ................................. 10
Changes to Ordering Guide .......................................................... 12
9/10—Revision 0: Initial Version
Rev. A | Page 2 of 12
Enhanced Product
AD7980-EP
SPECIFICATIONS
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, VREF = 5 V, TA = –55°C to +125°C, unless otherwise noted.
Table 2.
Parameter
RESOLUTION
ANALOG INPUT
Voltage Range
Absolute Input Voltage
Analog Input CMRR
Leakage Current @ 25°C
ACCURACY
No Missing Codes
Differential Linearity Error
Integral Linearity Error
Transition Noise
Gain Error, TMIN to TMAX2
Gain Error Temperature Drift
Zero Error, TMIN to TMAX2
Zero Temperature Drift
Power Supply Sensitivity
THROUGHPUT
Conversion Rate
Transient Response
AC ACCURACY
Dynamic Range
Oversampled Dynamic Range
Signal-to-Noise Ratio, SNR
Spurious-Free Dynamic Range, SFDR
Total Harmonic Distortion, THD
Signal-to-(Noise + Distortion), SINAD
Conditions
Min
16
IN+ − IN−
IN+
IN−
fIN = 100 kHz
Acquisition phase
0
−0.1
−0.1
Typ
Max
VREF
VREF + 0.1
+0.1
60
1
16
−0.9
REF = 5 V
REF = 2.5 V
REF = 5 V
REF = 2.5 V
REF = 5 V
REF = 2.5 V
−1.5
−0.62
VDD = 2.5 V ± 5%
VIO ≥ 2.3 V up to 85°C, VIO ≥
3.3 V above 85°C up to 125°C
Full-scale step
±0.4
±0.55
±0.6
±0.65
0.6
1.0
±2
±0.35
±0.08
0.54
±0.1
0
VREF = 5 V
VREF = 2.5 V
fO = 10 kSPS
fIN = 10 kHz, VREF = 5 V
fIN = 10 kHz, VREF = 2.5 V
fIN = 10 kHz
fIN = 10 kHz
fIN = 10 kHz, VREF = 5 V
fIN = 10 kHz, VREF = 2.5 V
+0.9
+1.5
+0.62
2
Rev. A | Page 3 of 12
V
V
V
dB
nA
Bits
LSB1
LSB1
LSB1
LSB1
LSB1
LSB1
LSB1
ppm/°C
mV
ppm/°C
LSB1
1
MSPS
290
ns
92
87
111
91.5
87
−110
−114
91
86.5
LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV.
These specifications include full temperature range variation, but not the error contribution from the external reference.
3
All specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
1
Unit
Bits
dB3
dB3
dB3
dB3
dB3
dB3
dB3
dB3
dB3
AD7980-EP
Enhanced Product
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, VREF = 5 V, TA = –55°C to +125°C, unless otherwise noted.
Table 3.
Parameter
REFERENCE
Voltage Range
Load Current
SAMPLING DYNAMICS
−3 dB Input Bandwidth
Aperture Delay
DIGITAL INPUTS
Logic Levels
VIL
VIH
VIL
VIH
IIL
IIH
DIGITAL OUTPUTS
Data Format
Pipeline Delay
VOL
VOH
POWER SUPPLIES
VDD
VIO
VIO Range
Standby Current1, 2
Power Dissipation
Total
VDD Only
REF Only
VIO Only
Energy per Conversion
TEMPERATURE RANGE
Specified Performance
1
2
Conditions
Min
Typ
2.4
Max
Unit
5.1
1 MSPS, REF = 5 V
330
V
µA
VDD = 2.5 V
10
2.0
MHz
ns
VIO > 3V
VIO > 3V
VIO ≤ 3V
VIO ≤ 3V
–0.3
0.7 × VIO
–0.3
0.9 × VIO
−1
−1
Serial 16 bits straight binary
Conversion results available immediately
after completed conversion
0.4
VIO − 0.3
ISINK = 500 µA
ISOURCE = −500 µA
2.375
2.3
1.8
Specified performance
VDD and VIO = 2.5 V, 25°C
VDD = 2.625 V, VREF = 5 V, VIO = 3 V
10 kSPS throughput
1 MSPS throughput
TMIN to TMAX
0.3 × VIO
VIO + 0.3
0.1 × VIO
VIO + 0.3
+1
+1
2.5
2.625
5.5
5.5
0.35
70
7.0
4
1.7
1.3
7.0
−55
With all digital inputs forced to VIO or GND as required.
During the acquisition phase.
Rev. A | Page 4 of 12
10
+125
V
V
µA
µA
µA
V
V
V
V
V
μA
µW
mW
mW
mW
mW
nJ/sample
°C
Enhanced Product
AD7980-EP
TIMING SPECIFICATIONS
−55°C to +125°C, VDD = 2.37 V to 2.63 V, VIO = 3.3 V to 5.5 V, unless otherwise stated. See Figure 2 and Figure 3 for load conditions.
Table 4.
Parameter
Conversion Time: CNV Rising Edge to Data Available
Acquisition Time
Time Between Conversions
CNV Pulse Width (CS Mode)
SCK Period (CS Mode)
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
SCK Period (Chain Mode)
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
SCK Low Time
SCK High Time
SCK Falling Edge to Data Remains Valid
SCK Falling Edge to Data Valid Delay
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
CNV or SDI Low to SDO D15 MSB Valid (CS Mode)
VIO Above 3 V
VIO Above 2.3 V
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
SDI Valid Setup Time from CNV Rising Edge
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
SDI Valid Hold Time from CNV Rising Edge (Chain Mode)
SCK Valid Setup Time from CNV Rising Edge (Chain Mode)
SCK Valid Hold Time from CNV Rising Edge (Chain Mode)
SDI Valid Setup Time from SCK Falling Edge (Chain Mode)
SDI Valid Hold Time from SCK Falling Edge (Chain Mode)
SDI High to SDO High (Chain Mode with Busy Indicator)
IOL
IOH
tSCKL
tSCKH
tHSDO
tDSDO
9.5
11
12
14
ns
ns
ns
ns
10
15
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tEN
tDIS
tSSDICNV
tHSDICNV
tHSDICNV
tSSCKCNV
tHSCKCNV
tSSDISCK
tHSDISCK
tDSDOSDI
5
2
0
5
5
2
3
15
Y% VIO1
tDELAY
VIH2
VIL2
1FOR VIO ≤ 3.0V, X = 90 AND Y = 10; FOR VIO > 3.0V X = 70, AND Y = 30.
2MINIMUM V AND MAXIMUM V USED. SEE DIGITAL INPUTS
IH
IL
09304-002
500µA
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
11.5
13
14
16
4.5
4.5
3
VIH2
VIL2
1.4V
Max
710
tSCK
X% VIO1
CL
20pF
Typ
10.5
12
13
15
tDELAY
TO SDO
Min
500
290
1000
10
SPECIFICATIONS IN TABLE 3.
Figure 2. Load Circuit for Digital Interface Timing
Figure 3. Voltage Levels for Timing
Rev. A | Page 5 of 12
09304-003
500µA
Symbol
tCONV
tACQ
tCYC
tCNVH
tSCK
AD7980-EP
Enhanced Product
ABSOLUTE MAXIMUM RATINGS
Table 5.
Parameter
Analog Inputs
IN+, IN− to GND
Supply Voltage
REF, VIO to GND
VDD to GND
VDD to VIO
Digital Inputs to GND
Digital Outputs to GND
Storage Temperature Range
Junction Temperature
θJA Thermal Impedance
(10-Lead MSOP)
θJC Thermal Impedance
(10-Lead MSOP)
Lead Temperature
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
−0.3 V to VREF + 0.3 V or ±130 mA
−0.3 V to +6 V
−0.3 V to +3 V
+3 V to −6 V
−0.3 V to VIO + 0.3 V
−0.3 V to VIO + 0.3 V
−65°C to +150°C
150°C
200°C/W
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
ESD CAUTION
44°C/W
215°C
220°C
Rev. A | Page 6 of 12
Enhanced Product
AD7980-EP
REF 1
VDD 2
IN+ 3
IN– 4
GND 5
AD7980-EP
TOP VIEW
(Not to Scale)
10
VIO
9
SDI
8
SCK
7
SDO
6
CNV
09304-004
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 4. 10-Lead MSOP Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
1
Mnemonic
REF
Type1
AI
2
3
VDD
IN+
P
AI
4
5
6
IN−
GND
CNV
AI
P
DI
7
8
9
SDO
SCK
SDI
DO
DI
DI
10
VIO
P
Description
Reference Input Voltage. The REF range is from 2.4 V to 5.1 V. It is referred to the GND pin. This pin should
be decoupled closely to the pin with a 10 µF capacitor.
Power Supply.
Analog Input. It is referred to IN−. The voltage range, for example, the difference between IN+ and IN−, is
0 V to VREF.
Analog Input Ground Sense. To be connected to the analog ground plane or to a remote sense ground.
Power Supply Ground.
Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and
selects the interface mode of the part, chain, or CS mode. In CS mode, it enables the SDO pin when low.
In chain mode, the data should be read when CNV is high.
Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.
Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this clock.
Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as
follows.
Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data
input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital
data level on SDI is output on SDO with a delay of 16 SCK cycles.
CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can
enable the serial output signals when low; if SDI or CNV is low when the conversion is complete,
the busy indicator feature is enabled.
Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V, 2.5 V,
3 V, or 5 V).
AI = analog input, DI = digital input, DO = digital output, and P = power.
1
Rev. A | Page 7 of 12
AD7980-EP
Enhanced Product
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V, VREF = 5.0 V, VIO = 3.3 V, unless otherwise noted.
1.25
1.00
POSITIVE INL: +0.33 LSB
NEGATIVE INL: –0.39 LSB
1.00
POSITIVE INL: +0.18 LSB
NEGATIVE INL: –0.21 LSB
0.75
0.75
0.50
0.25
DNL (LSB)
INL (LSB)
0.50
0
–0.25
0.25
0
–0.25
–0.50
–0.50
–0.75
0
16384
32768
65536
49152
CODE
–1.00
09304-036
–1.25
0
65536
49152
Figure 8. Differential Nonlinearity vs. Code, REF = 5 V
1.00
POSITIVE INL: +0.47 LSB
NEGATIVE INL: –0.26 LSB
1.00
32768
CODE
Figure 5. Integral Nonlinearity vs. Code, REF = 5 V
1.25
16384
09304-039
–0.75
–1.00
POSITIVE INL: +0.25 LSB
NEGATIVE INL: –0.22 LSB
0.75
0.75
0.50
0.25
DNL (LSB)
INL (LSB)
0.50
0
–0.25
0.25
0
–0.25
–0.50
–0.50
–0.75
0
16384
32768
65536
49152
CODE
–1.00
09304-060
–1.25
0
32768
65536
49152
CODE
Figure 6. Integral Nonlinearity vs. Code, REF = 2.5 V
Figure 9. Differential Nonlinearity vs. Code, REF = 2.5 V
0
0
fS = 1 MSPS
fIN = 10kHz
–20
AMPLITUDE (dB of FULL SCALE)
SNR = 91.27dB
THD = –114.63dB
SFDR = 110.10dB
SINAD = 91.25dB
–40
fS = 1 MSPS
fIN = 10kHz
–20
–60
–80
–100
–120
–140
SNR = 86.8dB
THD = –111.4dB
SFDR = 105.9dB
SINAD = 86.8dB
–40
–60
–80
–100
–120
–140
–160
–180
0
100
200
300
FREQUENCY (kHz)
400
500
Figure 7. FFT Plot, REF = 5 V
–180
0
100
200
300
FREQUENCY (kHz)
Figure 10. FFT Plot, REF = 2.5 V
Rev. A | Page 8 of 12
400
500
09304-058
–160
09304-038
AMPLITUDE (dB of FULL SCALE)
16384
09304-061
–0.75
–1.00
Enhanced Product
AD7980-EP
60k
180k
168591
52212
160k
50k
140k
40k
COUNTS
COUNTS
120k
100k
80k
60k
32417
31340
30k
20k
52710
38751
40k
10k
7225
6807
20k
27
0
1201
829
33
2
0
0
0
8003 8004 8005 8006 8007 8008 8009 800A 800B 800C 800D 800E 800F
CODE IN HEX
0
0
0
16
502 14
0
0
7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
CODE IN HEX
09304-059
0
09304-042
0
539
Figure 14. Histogram of a DC Input at the Code Center, REF = 2.5 V
Figure 11. Histogram of a DC Input at the Code Center, REF = 5 V
95
70k
94
59691 59404
60k
93
92
SNR (dB)
COUNTS
50k
40k
30k
91
90
89
88
20k
87
5428
2
0
150
86
93
0
3
7FFF 8000 8001 8002 8003 8004 8005 8006 8007 8008
CODE IN HEX
85
–10
–9
–5
–4
–3
–2
0
–100
110
SFDR
105
–110
100
–115
95
THD
90
3.25
3.75
4.25
4.75
12
5.25
REFERENCE VOLTAGE (V)
09304-044
–120
2.75
–125
2.25
2.75
3.25
3.75
4.25
4.75
REFERENCE VOLTAGE (V)
Figure 16. THD, SFDR vs. Reference Voltage
Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage
Rev. A | Page 9 of 12
SFDR (dB)
13
–105
85
5.25
09304-047
85
THD (dB)
14
ENOB (BITS)
15
90
80
2.25
–1
115
–95
16
95
–6
Figure 15. SNR vs. Input Level
SNR
SINAD
ENOB
SNR, SINAD (dB)
–7
INPUT LEVEL (dB OF FULL SCALE)
Figure 12. Histogram of a DC Input at the Code Transition, REF = 5 V
100
–8
09304-046
0
6295
09304-043
10k
AD7980-EP
Enhanced Product
100
–85
–90
–95
–100
THD (dB)
SINAD (dB)
95
90
–105
–110
85
–115
1000
100
FREQUENCY (kHz)
–125
10
09304-063
80
10
Figure 20. THD vs. Frequency
95
–110
93
–112
91
–114
THD (dB)
89
87
–116
–15
5
25
45
65
85
105
125
TEMPERATURE (°C)
–120
–55
09304-049
–35
–35
–15
105
125
85
105
125
1.4
1.4
IVDD
IVDD
1.0
1.0
CURRENT (mA)
1.2
1.2
0.8
0.6
IREF
0.8
0.6
IREF
0.4
0.4
IVIO
IVIO
0.2
0.2
2.425
2.475
2.525
VDD VOLTAGE (V)
2.575
2.625
09304-050
CURRENT (mA)
85
Figure 21. THD vs. Temperature
Figure 18. SNR vs. Temperature
0
2.375
5
25
45
65
TEMPERATURE (°C)
09304-052
–118
0
–55
–35
–15
5
25
45
65
TEMPERATURE (°C)
Figure 22. Operating Currents vs. Temperature
Figure 19. Operating Currents vs. Supply
Rev. A | Page 10 of 12
09304-053
SNR (dB)
Figure 17. SINAD vs. Frequency
85
–55
1000
100
FREQUENCY (kHz)
09304-064
–120
Enhanced Product
AD7980-EP
8
7
5
4
3
IVDD + IVIO
2
1
0
–55
–35
–15
5
25
45
65
TEMPERATURE (°C)
85
105
125
09304-054
CURRENT (µA)
6
Figure 23. Power-Down Currents vs. Temperature
Rev. A | Page 11 of 12
AD7980-EP
Enhanced Product
OUTLINE DIMENSIONS
3.10
3.00
2.90
10
3.10
3.00
2.90
1
5.15
4.90
4.65
6
5
PIN 1
IDENTIFIER
0.50 BSC
0.95
0.85
0.75
15° MAX
1.10 MAX
0.30
0.15
6°
0°
0.70
0.55
0.40
0.23
0.13
COMPLIANT TO JEDEC STANDARDS MO-187-BA
091709-A
0.15
0.05
COPLANARITY
0.10
Figure 24.10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
AD7980SRMZ-EP-RL7
AD7980SRMZ-EP
1
Integral
Nonlinearity
±1.5 LSB max
±1.5 LSB max
Temperature Range
−55°C to +125°C
−55°C to +125°C
Ordering
Quantity
Reel, 1,000
Z = RoHS Compliant Part.
©2010–2015 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09304-0-7/15(A)
Rev. A | Page 12 of 12
Package Description
10-Lead MSOP
10-Lead MSOP
Package
Option
RM-10
RM-10
Branding
C78
C78