AD9218BSTZ-105 Analog Devices Inc, AD9218BSTZ-105 Datasheet

IC ADC 10BIT DUAL 105MSPS 48LQFP

AD9218BSTZ-105

Manufacturer Part Number
AD9218BSTZ-105
Description
IC ADC 10BIT DUAL 105MSPS 48LQFP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD9218BSTZ-105

Data Interface
Parallel
Number Of Bits
10
Sampling Rate (per Second)
105M
Number Of Converters
2
Power Dissipation (max)
565mW
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-LQFP
Resolution (bits)
10bit
Sampling Rate
105MSPS
Input Channel Type
Differential
Supply Voltage Range - Analog
2.7V To 3.6V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
Dual 10-bit, 40 MSPS, 65 MSPS, 80 MSPS, and 105 MSPS ADC
Low power: 275 mW at 105 MSPS per channel
On-chip reference and track-and-hold
300 MHz analog bandwidth each channel
SNR = 57 dB @ 41 MHz, Encode = 80 MSPS
1 V p-p or 2 V p-p analog input range each channel
3.0 V single-supply operation (2.7 V to 3.6 V)
Power-down mode for single-channel operation
Twos complement or offset binary output mode
Output data alignment mode
Pin compatible with the 8-bit AD9288
–75 dBc crosstalk between channels
APPLICATIONS
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
I and Q communications
Ultrasound equipment
GENERAL DESCRIPTION
The AD9218 is a dual 10-bit monolithic sampling analog-to-
digital converter with on-chip track-and-hold circuits. The
product is low cost, low power, and is small and easy to use. The
AD9218 operates at a 105 MSPS conversion rate with
outstanding dynamic performance over its full operating range.
Each channel can be operated independently.
The ADC requires only a single 3.0 V (2.7 V to 3.6 V) power
supply and a clock for full operation. No external reference or
driver components are required for many applications. The
digital outputs are TTL/CMOS compatible and a separate
output power supply pin supports interfacing with 3.3 V or
2.5 V logic.
The clock input is TTL/CMOS compatible and the 10-bit digital
outputs can be operated from 3.0 V (2.5 V to 3.6 V) supplies.
User-selectable options offer a combination of power-down
modes, digital data formats, and digital data timing schemes.
In power-down mode, the digital outputs are driven to a high
impedance state.
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.
3 V Dual Analog-to-Digital Converter
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
ENCODE B
ENCODE A
REF
REF
REF
Low Power. Only 275 mW power dissipation per channel
at 105 MSPS. Other speed grades proportionally scaled
down while maintaining high ac performance.
Pin Compatibility Upgrade. Allows easy migration from 8-bit
to 10-bit devices. Pin compatible with the 8-bit AD9288
dual ADC.
Easy to Use. On-chip reference and user controls provide
flexibility in system design.
High Performance. Maintains 54 dB SNR at 105 MSPS
with a Nyquist input.
Channel Crosstalk. Very low at –75 dBc.
Fabricated on an Advanced CMOS Process. Available in a
48-lead low profile quad flat package (7 mm × 7 mm
LQFP) specified over the industrial temperature range
(−40°C to +85°C).
A
A
A
A
10-Bit, 40/65/80/105 MSPS
OUT
IN
IN
IN
IN
IN
IN
B
B
B
A
A
A
FUNCTIONAL BLOCK DIAGRAM
TIMING
TIMING
T/H
T/H
©2006 Analog Devices, Inc. All rights reserved.
Figure 1.
ADC
ADC
REF
V
D
10
10
/
/
AD9218
REGISTER
REGISTER
OUTPUT
OUTPUT
GND
V
DD
10
10
AD9218
/
/
www.analog.com
D9
USER
SELECT NO. 1
USER
SELECT NO. 2
DATA
FORMAT/
GAIN
D9
A
B
TO D0
TO D0
A
B

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AD9218BSTZ-105 Summary of contents

Page 1

FEATURES Dual 10-bit, 40 MSPS, 65 MSPS, 80 MSPS, and 105 MSPS ADC Low power: 275 mW at 105 MSPS per channel On-chip reference and track-and-hold 300 MHz analog bandwidth each channel SNR = MHz, Encode ...

Page 2

TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 DC Specifications ......................................................................... 3 Digital Specifications ................................................................... 4 AC Specifications.......................................................................... 5 Switching Specifications ...

Page 3

SPECIFICATIONS DC SPECIFICATIONS 3.0 V; external reference, unless otherwise noted Table 1. Parameter Temp RESOLUTION ACCURACY 1 No Missing Codes Full 2 Offset Error 25°C 2 Gain Error 25°C Differential Nonlinearity 25°C ...

Page 4

AD9218 DIGITAL SPECIFICATIONS 3.0 V; external reference, unless otherwise noted Table 2. Parameter Temp DIGITAL INPUTS Encode Input Common Full Mode Encode 1 Voltage Full Encode 0 Voltage Full Encode Input Resistance ...

Page 5

AC SPECIFICATIONS 3.0 V; external reference, unless otherwise noted Table 3. Parameter 1 DYNAMIC PERFORMANCE Signal-to-Noise Ratio (SNR) (Without Harmonics 10.3 MHz Nyquist 2 IN Signal-to-Noise and ...

Page 6

AD9218 SWITCHING SPECIFICATIONS 3.0 V; external reference, unless otherwise noted Table 4. Parameter ENCODE INPUT PARAMETERS Maximum Encode Rate Minimum Encode Rate Encode Pulse Width High ( Encode Pulse Width ...

Page 7

SAMPLE SAMPLE SAMPLE SAMPLE 1 ENCODE A ENCODE DATA N – 10 DATA ...

Page 8

AD9218 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Analog Inputs Digital Inputs REF Inputs IN Digital Output Current Operating Temperature Storage Temperature Maximum Junction Temperature Maximum Case Temperature θ (measured on a 4-layer board with A ...

Page 9

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 7. Pin Function Descriptions Pin Number Mnemonic Description 1, 12, 16, 27, 29, GND Ground. 32, 34 Analog Input for Channel Analog Input for Channel ...

Page 10

AD9218 TERMINOLOGY Analog Bandwidth The analog input frequency at which the spectral power of the fundamental frequency (as determined by the FFT analysis) is reduced by 3 dB. Aperture Delay The delay between the 50% point of the rising edge ...

Page 11

Signal-to-Noise and Distortion (SINAD) The ratio of the rms signal amplitude (set 1 dB below full scale) to the rms value of the sum of all other spectral components, including harmonics but excluding dc. Signal-to-Noise Ratio (without Harmonics) The ratio ...

Page 12

AD9218 EQUIVALENT CIRCUITS 30kΩ 30kΩ 40kΩ 15kΩ 15kΩ Figure 6. Analog Input Stage 2.6kΩ 600kΩ ENCODE 2.6kΩ Figure 7. Encode Inputs V D OUT Figure 8. Reference Output Stage V 40kΩ DX Figure 9. Digital Output Stage V ...

Page 13

TYPICAL PERFORMANCE CHARACTERISTICS 0 ENCODE = 105MSPS – 50.1MHz AT –0.5dBFS IN SNR = 53.8dB –20 SINAD = 53.4dB H2 = –69dB – –65.8dB –40 –50 –60 –70 –80 –90 –100 0 Figure 14. FFT: FS ...

Page 14

AD9218 0 ENCODE = 31MSPS – 8MHz AT –0.5dBFS IN SNR = 59.23dB –20 SINAD = 59.1dB H2 = –87dB – –81dB –40 –50 –60 –70 –80 –90 –100 0 Figure 20. FFT ...

Page 15

DIFFERENTIAL DRIVE SFDR SFDR SINGLE-ENDED DRIVE 100 120 A FREQUENCY (MHz) IN Figure 26. ...

Page 16

AD9218 75 70 SFDR SINAD ENCODE POSITIVE PULSEWIDTH (ns) Figure 32. SINAD and SFDR vs. Encode Pulse Width High, A Single-Ended p-p Analog Input ...

Page 17

I (mA) LOAD Figure 38. V vs. I REF LOAD 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 0 CODES Figure 39. ...

Page 18

AD9218 THEORY OF OPERATION The AD9218 ADC architecture is a bit-per-stage pipeline-type converter utilizing switch capacitor techniques. These stages determine the 7 MSBs and drive a 3-bit flash. Each stage provides sufficient overlap and error correction, allowing optimization of comparator ...

Page 19

VOLTAGE REFERENCE A stable and accurate 1.25 V voltage reference is built into the AD9218 (VREF OUT). Typically, the internal reference is used by strapping Pin 5 (REF A) and Pin 7 (REF IN (REF ). The input range for ...

Page 20

AD9218 AD9218/AD9288 CUSTOMER PCB BOM Table 8. Bill of Materials No. Qty Reference Designator C15, C20, C21, C24, C25, C27, C30 to C35, C39 to C42 2 2 C2, C36 3 7 C16–C19, C26, C37, ...

Page 21

EVALUATION BOARD The AD9218/AD9288 customer evaluation board offers an easy way to test the AD9218 or the AD9288. The compatible pinout of the two parts facilitates the use of one PCB for testing either part. The PCB requires power supplies, ...

Page 22

AD9218 ...

Page 23

Figure 46. PCB Schematic (Continued) Rev Page AD9218 02001-046 ...

Page 24

AD9218 Figure 47. Top Silkscreen Figure 48. Top Routing Figure 49. Ground Plane Figure 50. Split Power Plane Figure 51. Bottom Routing Figure 52. Bottom Silkscreen Rev Page ...

Page 25

... AD9218BSTZ-80 1 –40°C to +85°C 1 AD9218BSTZ-RL80 –40°C to +85°C AD9218BST-105 –40°C to +85°C AD9218BST-RL105 –40°C to +85°C 1 AD9218BSTZ-105 –40°C to +85°C 1 AD9218BSTZ-RL105 −40°C to +85°C AD9218-65PCB AD9218-105PCB Pb-free part. 9.20 9.00 SQ 0.75 1 ...

Page 26

AD9218 NOTES Rev Page ...

Page 27

NOTES Rev Page AD9218 ...

Page 28

AD9218 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02001-0-12/06(C) Rev Page ...

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