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AD9236BRUZ-80 ,12-Bit, 80 MSPS, 3V A/D ConverterSPECIFICATIONS Table 1. AVDD = 3 V, DRVDD = 2.5 V, Sample Rate = 80 MSPS, 2 V p-p Differential Inpu ..
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AD9236BCPZ80-AD9236BCPZ-80-AD9236BCPZRL7-80-AD9236BRU-80-AD9236BRUZ-80-AD9236BRUZRL7-80
12-Bit, 80 MSPS, 3V A/D Converter
12-Bit, 80 MSPS, 3 V A/D ConverterFEATURES
Single 3 V supply operation (2.7 V to 3.6 V)
SNR = 70.4 dBc to Nyquist
SFDR = 87.8 dBc to Nyquist
Low power: 366 mW
Differential input with 500 MHz bandwidth
On-chip reference and sample-and-hold
DNL = ± 0.4 LSB
Flexible analog input: 1 V p-p to 2 V p-p range
Offset binary or twos complement data format
Clock duty cycle stabilizer
APPLICATIONS
High end medical imaging equipment
IF sampling in communications receivers:
WCDMA, CDMA-One, CDMA-2000
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
DTV subsystems
GENERAL DESCRIPTION The AD9236 is a monolithic, single 3 V supply, 12-bit, 80 MSPS
analog-to-digital converter featuring a high performance sam-
ple-and-hold amplifier (SHA) and voltage reference. The
AD9236 uses a multistage differential pipelined architecture
with output error correction logic to provide 12-bit accuracy at
80 MSPS and guarantee no missing codes over the full operat-
ing temperature range.
The wide bandwidth, truly differential SHA allows a variety of
user-selectable input ranges and common modes, including
single-ended applications. It is suitable for multiplexed systems
that switch full-scale voltage levels in successive channels and
for sampling single-channel inputs at frequencies well beyond
the Nyquist rate. Combined with power and cost savings over
previously available analog-to-digital converters, the AD9236 is
suitable for applications in communications, imaging, and
medical ultrasound.
A single-ended clock input is used to control all internal con-
version cycles. A duty cycle stabilizer (DCS) compensates for
wide variations in the clock duty cycle while maintaining excel-
lent overall ADC performance. The digital output data is
FUNCTIONAL BLOCK DIAGRAM DRVDDAVDD
AGND
CLKPDWNMODEDGND
OTR
VIN+
VIN–
REFT
REFB
VREF
SENSE
D11 (MSB)
D0 (LSB)
Figure 1. Functional Block Diagram
presented in straight binary or twos complement formats. An
out-of-range (OTR) signal indicates an overflow condition that
can be used with the most significant bit to determine low or
high overflow. Fabricated on an advanced CMOS process, the
AD9236 is available in a 28-lead TSSOP and a 32-lead LFCSP
and is specified over the industrial temperature range
(–40°C to +85°C).
PRODUCT HIGHLIGHTS 1. The AD9236 operates from a single 3 V power supply and
features a separate digital output driver supply to accommo-
date 2.5 V and 3.3 V logic families.
2. Operating at 80 MSPS, the AD9236 consumes a low 366 mW.
3. The patented SHA input maintains excellent performance for
input frequencies up to 100 MHz, and can be configured for
single-ended or differential operation.
4. The AD9236 is pin compatible with the AD9215, AD9235,
and AD9245. This allows a simplified migration from 10 bits
to 14 bits and 20 MSPS to 80 MSPS.
5. The DCS maintains overall ADC performance over a wide
range of clock pulsewidths.
6. The OTR output bit indicates when the signal is beyond the
selected input range.
Rev.A
TABLE OF CONTENTS AD9236–DC Specifications............................................................3
AD9236–AC Specifications.............................................................4
AD9236–Digital Specifications.......................................................5
AD9236–Switching Specifications.................................................6
Explanation of Test Levels...........................................................6
Absolute Maximum Ratings............................................................7
Thermal Resistance......................................................................7
ESD Caution..................................................................................7
Definitions of Specifications...........................................................8
Pin Configurations and Functional Descriptions........................9
Equivalent Circuits.........................................................................10
Typical Performance Characteristics...........................................11
Theory of Operation......................................................................14
Analog Input and Reference Overview...................................14
Clock Input Considerations......................................................15
Jitter Considerations..................................................................16
Power Dissipation and Standby Mode....................................16
Digital Outputs...........................................................................16
Timing.........................................................................................17
Voltage Reference.......................................................................17
Internal Reference Connection................................................17
External Reference Operation..................................................18
Operational Mode Selection.....................................................18
Evaluation Board........................................................................18
Outline Dimensions.......................................................................33
Ordering Guide..........................................................................33
REVISION HISTORY Revision A
10/03—Data Sheet Changed from REV. 0 to REV. A
Changes to Figure 30 .....................................................................15
Changes to Figure 33 .....................................................................17
Changes to Figure 40......................................................................22
Changes to Figure 49......................................................................28
Changes to Figure 50......................................................................29
Changes to Table 11........................................................................32
Changes to ORDERING GUIDE ................................................33
AD9236–DC SPECIFICATIONS
Table 1. AVDD = 3 V, DRVDD = 2.5 V, Sample Rate = 80 MSPS, 2 V p-p Differential Input, 1.0 V External Reference, unless
otherwise noted With a 1.0 V internal reference.
2 Measured at fIN = 2.4 MHz, full-scale sine wave, with approximately 5 pF loading on each output bit.
AD9236–AC SPECIFICATIONS
Table 2. AVDD = 3 V, DRVDD = 2.5 V, Sample Rate = 80 MSPS, 2 V p-p Differential Input, 1.0 V External Reference,
AIN = –0.5 dBFS, DCS Off, unless otherwise noted AD9236–DIGITAL SPECIFICATIONS
Table 3. AVDD = 3 V, DRVDD = 2.5 V, 1.0 V External Reference, unless otherwise noted Output voltage levels measured with 5 pF load on each output.
