AD9260 Datasheet, PDF (1/36 Pages) Analog Devices – High-Speed Oversampling CMOS ADC with 16-Bit Resolution at a 2.5 MHz Output Word Rate

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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 w/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 Stopband Attenuation
0.004 dB Passband 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
High-Speed Oversampling CMOS
ADC with 16-Bit Resolution
at a 2.5 MHz Output Word Rate
AD9260
FUNCTIONAL BLOCK DIAGRAM
VINA
VINB
REF TOP
REF
BOTTOM
COMMON
MODE
VREF
SENSE
REFCOM
RESET/
SYNC
DVSS DVDD
MULTIBIT
SIGMA-DELTA
MODULATOR
DIGITAL
DEMODULATOR
12-BIT: 20MHz
AD9260
STAGE 1:2X
16-BIT: 10MHz DECIMATION
FILTER
REFERENCE
BUFFER
STAGE 2:2X
16-BIT: 5MHz DECIMATION
FILTER
STAGE 3:2X
16-BIT: 2.5MHz DECIMATION
FILTER
BANDGAP
REFERENCE
BIAS
CIRCUIT
CLOCK
BUFFER
MODE
REGISTER
OTR
BIT1–BIT16
DAV
READ
BIAS ADJUST CLK
MODE CS
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 rejection of common-mode signals. The sig-
nal range of each differential input is ± 1 V centered on a 2.0 V
common-mode level.
The on-chip decimation filter is configured for maximum per-
formance and flexibility. A series of three half-band FIR filter
stages provide 8× decimation filtering with 85 dB of stopband
attenuation and 0.004 dB of passband ripple. An onboard digi-
tal multiplexer allows the user to access data from the various
stages of the decimation filter.
The on-chip programmable reference and reference buffer am-
plifier 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 con-
suming 585 mW of power. A power scaling circuit is provided
allowing the AD9260 to operate at power consumption 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
passband ripple and 85 dB of stopband 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 of 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 accom-
modate a single +3 V supply for reduced power.
REV. B
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