AD AD7946

16-Bit, 1 MSPS PulSAR ADC in MSOP/QFN
AD7980-EP
APPLICATION DIAGRAM EXAMPLE
2.5V TO 5V
16-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation: 7.0 mW @ 1 MSPS, 70 µW @ 10 kSPS
INL: ±1.5 LSB typical, ±1.25 LSB maximum
SINAD: 91.5 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
Any input range and easy to drive with the ADA4841
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V
logic interface
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
REF VDD
0 TO VREF
IN+
IN–
VIO
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-EP 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.
APPLICATIONS
Battery-powered equipment
Communications
ATE
Data acquisitions
Medical instruments
The AD7980-EP is housed in a 10-lead MSOP with operation
specified from −55°C to +125°C.
Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADC
Type
18-Bit
100 kSPS
250 kSPS
AD7691 1
400 kSPS to 500 kSPS
AD76901
1000 kSPS
AD79821
16-Bit
AD7680
AD7683
AD7684
AD7940
AD76851
AD76871
AD7694
AD79421
AD76861
AD76881
AD76931
AD79461
AD79801
14-Bit
1
ADC Driver
ADA4941
ADA4841
ADA4941
ADA4841
Pin-for-pin compatible.
Rev. 0
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.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
AD7980-EP
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
9/10 —Revision 0: Initial Version
Rev. 0 | Page 2 of 12
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 TMAX 2
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
1
+0.9
+1.5
+0.62
Rev. 0 | Page 3 of 12
V
V
V
dB
nA
Bits
LSB 1
LSB1
LSB1
LSB1
LSB1
LSB1
LSB1
ppm/°C
mV
ppm/°C
LSB1
1
MSPS
290
ns
92
87
111
91
86.5
−110
−114
91.5
87.0
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.
2
Unit
Bits
dB 3
dB3
dB3
dB3
dB3
dB3
dB3
dB3
dB3
AD7980-EP
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 Current 1, 2
Power Dissipation
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
ISINK = 500 µA
ISOURCE = −500 µA
Specified performance
–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
2.375
2.3
1.8
VDD and VIO = 2.5 V, 25°C
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
0.35
70
7.0
7.0
−55
With all digital inputs forced to VIO or GND as required.
During the acquisition phase.
Rev. 0 | Page 4 of 12
2.625
5.5
5.5
10
+125
V
V
µA
µA
µA
V
V
V
V
V
nA
µW
mW
nJ/sample
°C
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)
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
9.5
11
12
14
ns
ns
ns
ns
10
15
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tSCK
11.5
13
14
16
4.5
4.5
3
tSCKL
tSCKH
tHSDO
tDSDO
tEN
tDIS
tSSDICNV
tHSDICNV
tHSDICNV
tSSCKCNV
tHSCKCNV
tSSDISCK
tHSDISCK
tDSDOSDI
5
2
0
5
5
2
3
15
X% VIO1
tDELAY
VIH2
VIL2
1.4V
CL
20pF
VIH2
VIL2
VIO ≤ 3.0V, X = 90 AND Y = 10; FOR VIO > 3.0V X = 70, AND Y = 30.
VIH AND MAXIMUM VIL USED. SEE DIGITAL INPUTS
SPECIFICATIONS IN TABLE 3.
1FOR
09304-002
IOH
Max
710
10.5
12
13
15
tDELAY
500µA
Typ
Y% VIO1
IOL
TO SDO
Min
500
290
1000
10
2MINIMUM
Figure 2. Load Circuit for Digital Interface Timing
Figure 3. Voltage Levels for Timing
Rev. 0 | Page 5 of 12
09304-003
500µA
Symbol
tCONV
tACQ
tCYC
tCNVH
tSCK
AD7980-EP
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 above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
44°C/W
215°C
220°C
Rev. 0 | Page 6 of 12
AD7980-EP
REF 1
10
VIO
VDD 2
9
SDI
IN+ 3
IN– 4
AD7980-EP
TOP VIEW
(Not to Scale)
GND 5
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
2
3
4
5
6
7
8
9
10
Mnemonic
REF
VDD
IN+
IN−
GND
CNV
SDO
SCK
SDI
VIO
Rev. 0 | Page 7 of 12
AD7980-EP
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. 0 | Page 8 of 12
400
500
09304-058
–160
09304-038
AMPLITUDE (dB of FULL SCALE)
16384
09304-061
–0.75
–1.00
AD7980-EP
180k
60k
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
829
33
2
0
0
0
CODE IN HEX
0
0
0
16
539
502 14
0
0
7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006
CODE IN HEX
09304-059
0
8003 8004 8005 8006 8007 8008 8009 800A 800B 800C 800D 800E 800F
09304-042
0
1201
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
59691 59404
60k
94
93
92
SNR (dB)
COUNTS
50k
40k
30k
91
90
89
88
20k
87
0
2
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
–100
110
SFDR
–105
105
–110
100
–115
95
THD
13
90
2.75
3.25
3.75
4.25
4.75
12
5.25
REFERENCE VOLTAGE (V)
09304-044
–120
–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. 0 | Page 9 of 12
85
5.25
09304-047
85
SFDR (dB)
THD (dB)
14
ENOB (BITS)
15
90
80
2.25
0
–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
5428
09304-043
10k
AD7980-EP
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
1.2
1.0
1.0
CURRENT (mA)
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
45
65
5
25
TEMPERATURE (°C)
Figure 22. Operating Currents vs. Temperature
Figure 19. Operating Currents vs. Supply
Rev. 0 | Page 10 of 12
09304-053
SNR (dB)
Figure 17. SINAD vs. Frequency
85
–55
1000
100
FREQUENCY (kHz)
09304-064
–120
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. 0 | Page 11 of 12
AD7980-EP
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
Model
AD7980SRMZ-EP-RL7 1
1
Integral
Nonlinearity
±1.5 LSB max
Temperature Range
−55°C to +125°C
Ordering
Quantity
Reel, 1,000
Z = RoHS Compliant Part.
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09304-0-9/10(0)
Rev. 0 | Page 12 of 12
Package Description
10-Lead MSOP
Package
Option
RM-10
Branding
C78