AD9231 Analog Devices, Inc., AD9231 Datasheet

AD9231

Manufacturer Part Number

AD9231

Description

12-bit, 20/40/65/80 Msps, 1.8v Dual Analog-to-digital Converter

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD9231.pdf (4 pages)

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Preliminary Technical Data

FEATURES

1.8 V analog supply operation

1.8 V to 3.3 V output supply

SNR = 70 dBFs up to 170 MHz input

SFDR = 85 dBc up to 70 MHz input

Low ADC Core power:

Differential input with 650 MHz bandwidth

On-chip voltage reference and sample-and-hold amplifier

DNL = ±0.5 LSB

Flexible analog input: 1 V p-p or 2 V p-p differential

Offset binary, Gray code, or twos complement data format

Clock duty cycle stabilizer

Programmable Clock Divider

Data output clock

Serial port control

APPLICATIONS

IF sampling and direct conversion in communications

Test and measurement portable instruments

Hand-held scope meters

Automotive Radar

GENERAL DESCRIPTION

The AD9231 is a monolithic, dual channel 1.8 V supply, 12-bit,

20/40/65/80 MSPS analog-to-digital converter (ADC), featuring

a high performance sample-and-hold circuit and on-chip

voltage reference. The product uses a multi-stage differential

pipeline architecture with output error correction logic to

provide 12-bit accuracy at 80 MSPS data rates and guarantees

no missing codes over the full operating temperature range.

The ADC contains several features designed to maximize

flexibility and minimize system cost, such as programmable

clock and data alignment and programmable digital test pattern

generation. The available digital test patterns include built-in

deterministic and pseudorandom patterns, along with custom

user-defined test patterns entered via the serial port interface (SPI).

A differential clock input controls all internal conversion cycles. A

duty cycle stabilizer (DCS) compensates for wide variations in the

clock duty cycle while maintaining excellent overall ADC

performance.

Rev. PrC

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.

Programmable clock and data alignment

receivers: 3G, 4G, TDS-CDMA, CDMA2000, LTE, Wimax

Built-in selectable digital test pattern generation

33 mW/ch @ 20MSPS

73 mW/ch @ 80MSPS

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The digital output data is available in Offset Binary, Gray Code, or

Twos Complement formats. A data output clock (DCO) is

provided for each ADC channel to ensure proper latch timing

with receiving logic.

The AD9231 is available in a 64-lead Pb-free LFCSP and is

specified over the industrial temperature range (−40°C to

+85°C).

PRODUCT HIGHLIGHTS

Dual Analog-to-Digital Converter

12-Bit, 20/40/65/80 MSPS, 1.8V

The AD9231 operates from a single 1.8 V power supply

and features a separate digital output driver supply to

accommodate 1.8 V to 3.3 V logic families.

The patented sample and hold circuit maintains excellent

performance for input frequencies up to 200 MHz and is

designed for low cost, low power and ease of use.

The clock Duty Cycle Stabilizer (DCS) maintains overall

ADC performance over a wide range of clock pulse widths.

A standard serial port interface (SPI) supports various

product features and functions, such as data formatting

(offset binary, twos complement, or Gray coding), enabling

the clock DCS, power-down, and voltage reference mode.

The AD9231 is pin compatible with the 10bit AD9204 and

14bit AD9251, allowing for a simple migration between 10

bits and 14 bits.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

AD9231

www.analog.com

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AD9231 Summary of contents

Page 1

... Test and measurement portable instruments Hand-held scope meters Automotive Radar GENERAL DESCRIPTION The AD9231 is a monolithic, dual channel 1.8 V supply, 12-bit, 20/40/65/80 MSPS analog-to-digital converter (ADC), featuring a high performance sample-and-hold circuit and on-chip voltage reference. The product uses a multi-stage differential pipeline architecture with output error correction logic to provide 12-bit accuracy at 80 MSPS data rates and guarantees no missing codes over the full operating temperature range ...

Page 2

... AD9231 CLK+ 1 CLK- 2 SYNC D0B (LSB) 8 D1B 9 DRVDD 10 D2B 11 12 D3B D4B 13 D5B 14 D6B 15 D7B Top View (not to scale Figure 2. Device Pin Map Rev. PrC | Page Preliminary Technical Data ...

Page 3

... Digital input. Powerdown chip if “high”. 50Kohm internal pulldown. Channel B digital outputs. D11B = MSB Channel A digital outputs. D11A = MSB Channel B Out-of-Range digital output. Channel A Out-of-Range digital output. Channel B Data Clock digital output. Channel A Data Clock digital output. Do Not Connect Rev. PrC | Page AD9231 ...

Page 4

... AD9231BCPZRL7–40 –40°C to +85°C AD9231BCPZ-20 1,2 –40°C to +85°C 1,2 AD9231BCPZRL7–20 –40°C to +85°C 1 AD9231Z-80EB 1 AD9231Z-65EB 1 AD9231Z-40EB 1 AD9231Z-20EB Pb-free part. 2 The exposed paddle is the only GND connection on the chip and must be connected to the PCB AGND. ...

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