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High Speed Oversampling CMOS ADC with
16-Bit Resolution at a 2.5 MHz Output Word Rate
AD9260
FEATURES
Monolithic 16-bit, oversampled A/D converter
8× oversampling mode, 20 MSPS clock
2.5 MHz output word rate
1.01 MHz signal passband with 0.004 dB ripple
Signal-to-noise ratio: 88.5 dB
Total harmonic distortion: –96 dB
Spurious-free dynamic range: 100 dB
Input referred noise: 0.6 LSB
Selectable oversampling ratio: 1×, 2×, 4×, 8×
Selectable power dissipation: 150 mW to 585 mW
85 dB stop-band attenuation
0.004 dB pass-band ripple
Linear phase
Single 5 V analog supply, 5 V/3 V digital supply
Synchronize capability for parallel ADC interface
Twos complement output data
44-lead MQFP
PRODUCT DESCRIPTION
The AD9260 is a 16-bit, high-speed oversampled analog-to-
digital converter (ADC) that offers exceptional dynamic range
over a wide bandwidth. The AD9260 is manufactured on an
advanced CMOS process. High dynamic range is achieved with
an oversampling ratio of 8× through the use of a proprietary
technique that combines the advantages of sigma-delta and
pipeline converter technologies. The AD9260 is a switched-
capacitor ADC with a nominal full-scale input range of 4 V. It
offers a differential input with 60 dB of common-mode rejec-
tion of common-mode signals. The signal range of each differ-
ential input is ±1 V centered on a 2.0 V common-mode level.
The on-chip decimation filter is configured for maximum
performance and flexibility. A series of three half-band FIR
filter stages provide 8× decimation filtering with 85 dB of stop-
band attenuation and 0.004 dB of pass-band ripple. An onboard
digital multiplexer allows the user to access data from the
various stages of the decimation filter. The on-chip
programmable reference and reference buffer amplifier are
configured for maximum accuracy and flexibility. An external
reference can also be chosen to suit the user’s specific dc
accuracy and drift requirements.
The AD9260 operates on a single +5 V supply, typically
consuming 585 mW of power. A power scaling circuit is
provided allowing the AD9260 to operate at power consump-
Rev. C
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.
FUNCTIONAL BLOCK DIAGRAM
RESET/
SYNC DVSS DVDD
VINA
VINB
REF TOP
REF
BOTTOM
COMMON
MODE
VREF
SENSE
REFCOM
MULTIBIT
SIGMA-DELTA
MODULATOR
AD9260
DIGITAL
DEMODULATOR
12-BIT:
20MHz
16-BIT:
10MHz
STAGE 1:2X
DECIMATION
FILTER
REFERENCE
BUFFER
16-BIT:
5MHz
STAGE 2:2X
DECIMATION
FILTER
16-BIT: STAGE 3:2X
2.5MHz DECIMATION
FILTER
BANDGAP
REFERENCE BIAS
CLOCK
MODE
CIRCUIT BUFFER REGISTER
OTR
BIT1–
BIT16
DAV
READ
BIAS ADJUST CLK
MODE CS
Figure 1.
tion levels as low as 150 mW at reduced clock and data rates.
The AD9260 is available in a 44-lead MQFP package and is
specified to operate over the industrial temperature range.
PRODUCT HIGHLIGHTS
The AD9260 is fabricated on a very cost effective CMOS
process. High speed, precision, mixed-signal analog circuits are
combined with high density digital filter circuits. The AD9260
offers a complete single-chip 16-bit sampling ADC with a 2.5
MHz output data rate in a 44-lead MQFP.
Selectable Internal Decimation Filtering—The AD9260
provides a high performance decimation filter with 0.004 dB
pass-band ripple and 85 dB of stop-band attenuation. The filter
is configurable with options for 1×, 2×, 4×, and 8× decimation.
Power Scaling—The AD9260 consumes a low 585 mW of
power at 16-bit resolution and 2.5 MHz output data rate. Its
power can be scaled down to as low as 150 mW at reduced
clock rates.
Single Supply—Both the analog and digital portions of the
AD9260 can operate off of a single +5 V supply, simplifying
system power supply design. The digital logic will also
accommodate a single +3 V supply for reduced power.
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 Analog Devices, Inc. All rights reserved.

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AD9260
TABLE OF CONTENTS
Specifications..................................................................................... 3
Clock Input Frequency Range .................................................... 3
DC Specifications ......................................................................... 3
AC Specifications.......................................................................... 4
Digital Filter Characteristics ....................................................... 6
Digital Filter Characteristics ....................................................... 7
Digital Specifications ................................................................... 9
Switching Specifications ............................................................ 10
Absolute Maximum Ratings.......................................................... 11
Thermal Characteristics ............................................................ 11
ESD Caution................................................................................ 11
Terminology .................................................................................... 12
Pin Configuration and Function Descriptions........................... 13
Typical Performance Characteristics ........................................... 14
Typical AC Characterization Curves
vs. Decimation Mode ................................................................. 15
Typical AC Characterization Curves for 8× Mode ................ 16
Typical AC Characterization Curves for 4× Mode ................ 17
Typical AC Characterization Curves for 2× Mode ................ 18
Typical AC Characterization Curves for 1× Mode ................ 19
Typical AC Characterization Curves ....................................... 20
Additional AC Characterization Curves ................................. 21
Theory of Operation ...................................................................... 23
Analog Input and Reference Overview ....................................... 24
Input Span ................................................................................... 24
Input Compliance Range........................................................... 24
Analog Input Operation ............................................................ 24
Driving the Input........................................................................ 25
Reference Operation ...................................................................... 28
Digital Inputs and Outputs ........................................................... 30
Digital Outputs ........................................................................... 30
Mode Operation ......................................................................... 31
Bias Pin Operation ..................................................................... 32
Power Dissipation Considerations ............................................... 33
Digital Output Driver Considerations (DRVDD) ................. 33
Grounding and Decoupling...................................................... 34
Evaluation Board General Description ....................................... 36
Features and User Controls....................................................... 36
Shipment Configuration............................................................ 37
Quick Setup................................................................................. 37
Application Information ........................................................... 38
Outline Dimensions ....................................................................... 43
Ordering Guide .......................................................................... 43
REVISION HISTORY
7/04—Changed from Rev. B to Rev. C
Changed “trimpot” to “variable resistor” ..................... Universal
Updated Format................................................................ Universal
Updated Outline Dimensions ......................................................43
Changes to Ordering Guide .........................................................43
5/00—Changed from Rev. A to Rev. B.
1/98—Changed from Rev. 0 to Rev. A.
Rev. C | Page 2 of 44

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SPECIFICATIONS
CLOCK INPUT FREQUENCY RANGE
Table 1.
Parameter—Decimation Factor (N)
CLOCK INPUT (Modulator Sample Rate, fCLOCK)
OUTPUT WORD RATE (FS = fCLOCK/N)
AD9260
AD9260 (8)
1
20
0.125
2.5
AD9260 (4)
1
20
0.250
5
AD9260 (2)
1
20
0.500
10
AD9260 (1)
1
20
1
20
Unit
kHz min
MHz max
kHz min
MHz max
DC SPECIFICATIONS
AVDD = +5 V, DVDD = +3 V, DRVDD = +3 V, fCLOCK = 20 MSPS, VREF = +2.5 V, Input CML = 2.0 V TMIN to TMAX unless otherwise noted,
RBIAS = 2 kΩ.
Table 2.
Parameter—Decimation Factor (N)
RESOLUTION
INPUT REFERRED NOISE (TYP)
1.0 V Reference
2.5 V Reference1
ACCURACY
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
No Missing Codes
Offset Error
Gain Error2
Gain Error3
TEMPERATURE DRIFT
Offset Error
Gain Error2
Gain Error3
POWER SUPPLY REJECTION
AVDD, DVDD, DRVDD (+5 V ±0.25 V)
ANALOG INPUT
Input Span
VREF= 1.0 V
VREF= 2.5 V
Input (VINA or VINB) Range
Input Capacitance
INTERNAL VOLTAGE REFERENCE
Output Voltage (1 V Mode)
Output Voltage Error (1 V Mode)
Output Voltage (2.5 V Mode)
Output Voltage Error (2.5 V Mode)
Load Regulation4
1 V REF
2.5 V REF
REFERENCE INPUT RESISTANCE
POWER SUPPLIES
Supply Voltages
AVDD
AD9260 (8)
16
AD9260 (4)
16
AD9260 (2)
16
AD9260 (1)
12
Unit
Bits min
1.40
0.68 (90.6)
2.4
1.2 (86)
6.0
3.7 (76)
1.3
1.0 (63.2)
LSB rms typ
LSB rms typ (dB typ)
± 0.75
± 0.50
16
0.9 (0.5)
2.75 (0.66)
1.35 (0.7)
± 0.75
± 0.50
16
(0.5)
(0.66)
(0.7)
± 0.75
± 0.50
16
(0.5)
(0.66)
(0.7)
± 0.3
± 0.25
12
(0.5)
(0.66)
(0.7)
LSB typ
LSB typ
Bits Guaranteed
% FSR max (typ @ +25°C)
% FSR max (typ @ +25°C)
% FSR max (typ @ +25°C)
2.5 2.5 2.5 2.5 ppm/°C typ
22 22 22 22 ppm/°C typ
7.0 7.0 7.0 7.0 ppm/°C typ
0.06 0.06 0.06 0.06 % FSR max
1.6
4.0
+0.5
+AVDD –0.5
10.2
1.6
4.0
+0.5
+AVDD –0.5
10.2
1.6
4.0
+0.5
+AVDD –0.5
10.2
1.6
4.0
+0.5
+AVDD –0.5
10.2
V p p Diff. max
V p p Diff. max
V min
V max
pF typ
1 1 1 1 V typ
± 14 ± 14 ± 14 ± 14 mV max
2.5 2.5 2.5 2.5 V typ
± 35 ± 35 ± 35 ± 35 mV max
0.5 0.5 0.5 0.5 mV max
2.0 2.0 2.0 2.0 mV max
8 8 8 8 kΩ
+5 +5 +5 +5 V (± 5%)
Rev. C | Page 3 of 44

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AD9260
Parameter—Decimation Factor (N)
DVDD and DRVDD
Supply Current
IAVDD
IDVDD
IDRVDD
POWER CONSUMPTION
AD9260 (8)
+5.5
+2.7
AD9260 (4)
+5.5
+2.7
AD9260 (2)
+5.5
+2.7
AD9260 (1)
+5.5
+2.7
Unit
V max
V min
115 115 115 115 mA typ
134 mA max
12.5 10.3 6.5 2.4 mA typ
3.5 mA max
0.450
0.850
1.7
2.6
mA typ
613 608 600 585 mW typ
630 mW max
1 VINA and VINB connect to DUT CML.
2 Including Internal 2.5 V reference.
3 Excluding Internal 2.5 V reference.
4 Load regulation with 1 mA load current (in addition to that required by AD9260).
AC SPECIFICATIONS
AVDD = +5 V, DVDD = +3 V, DRVDD = +3 V, fCLOCK = 20 MSPS, VREF = +2.5 V, Input CML = 2.0 V TMIN to TMAX unless otherwise noted,
RBIAS = 2 kΩ.
Table 3.
Parameter—Decimation Factor (N)
DYNAMIC PERFORMANCE
INPUT TEST FREQUENCY: 100 kHz (typ)
Signal-to-Noise Ratio (SNR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
SNR and Distortion (SINAD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Total Harmonic Distortion (THD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Spurious-Free Dynamic Range (SFDR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
INPUT TEST FREQUENCY: 500 kHz
Signal to Noise Ratio (SNR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
SNR and Distortion (SINAD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Total Harmonic Distortion (THD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Spurious-Free Dynamic Range (SFDR)
Input Amplitude = –0.5 dBFS
AD9260(8)
AD9260(4)
AD9260(2)
AD9260(1)
Unit
88.5 82 74 63 dB typ
82.5 78 68 58 dB typ
87.5 82 74 63 dB typ
82 77.5 69 58 dB typ
–96 –96 –97 –98 dB typ
–93 –98 –96 –98 dB typ
100 98 98 88 dB typ
94 100 94 84 dB typ
86.5 82 74 63 dB typ
80.5 dB min
82.5 77 68 58 dB typ
86.0 81 74 63 dB typ
80.0 dB min
82.0 77 68 58 dB typ
–97.0
–92
–89
–86
dB typ
–90.0
dB max
–95.5
–96
–89
–86
dB typ
99.0 92 91 88 dB typ
90.0 dB max
Rev. C | Page 4 of 44

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Parameter—Decimation Factor (N)
Input Amplitude = –6.0 dBFS
INPUT TEST FREQUENCY: 1.0 MHz (typ)
Signal-to-Noise Ratio (SNR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
SNR and Distortion (SINAD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Total Harmonic Distortion (THD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Spurious-Free Dynamic Range (SFDR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
INPUT TEST FREQUENCY: 2.0 MHz (typ)
Signal-to-Noise Ratio (SNR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
SNR and Distortion (SINAD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Total Harmonic Distortion (THD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Spurious-Free Dynamic Range (SFDR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
INPUT TEST FREQUENCY: 5.0 MHz (typ)
Signal-to-Noise Ratio (SNR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
SNR and Distortion (SINAD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Total Harmonic Distortion (THD)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
Spurious-Free Dynamic Range (SFDR)
Input Amplitude = –0.5 dBFS
Input Amplitude = –6.0 dBFS
INTERMODULATION DISTORTION
fIN1 = 475 kHz, fIN2 = 525 kHz
fIN1 = 950 kHz, fIN2 = 1.050 MHz
DYNAMIC CHARACTERISTICS
Full Power Bandwidth
Small Signal Bandwidth (AIN = –20 dBFS)
Aperture Jitter
AD9260
AD9260(8)
98
AD9260(4)
100
AD9260(2)
91
AD9260(1)
82
Unit
dB typ
85 82 74 63 dB typ
80 76 68 58 dB typ
84.5 81 74 63 dB typ
80 76 69 58 dB typ
–102
–96
–82
–79
dB typ
–96 –94 –84 –77 dB typ
105 98 83 80 dB typ
98 96 87 80 dB typ
82 74 63 dB typ
76 68 58 dB typ
81 73 62 dB typ
76 69 58 dB typ
–101
–80
–75
dB typ
–95 –80 –76 dB typ
104 80 78 dB typ
100 83 79 dB typ
59 dB typ
57 dB typ
58 dB typ
57 dB typ
–58 dB typ
–67 dB typ
59 dB typ
70 dB typ
–93 –91 –91 –83 dBFS typ
–95 –86 –85 –83 dBFS typ
75 75 75 75 MHz typ
75 75 75 75 MHz typ
2 2 2 2 ps rms typ
Rev. C | Page 5 of 44