AD9235BRUZ-40 Analog Devices Inc, AD9235BRUZ-40 Datasheet

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AD9235BRUZ-40

Manufacturer Part Number
AD9235BRUZ-40
Description
IC ADC 12BIT 40MSPS 28-TSSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD9235BRUZ-40

Data Interface
Parallel
Number Of Bits
12
Sampling Rate (per Second)
40M
Number Of Converters
3
Power Dissipation (max)
165mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-TSSOP (0.173", 4.40mm Width)
Resolution (bits)
12bit
Sampling Rate
40MSPS
Input Channel Type
Differential, Single Ended
Supply Voltage Range - Analog
2.7V To 3.6V
Supply Current
55mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AD9235BCP-65EBZ - BOARD EVAL FOR AD9235BCP-65AD9235BCP-40EBZ - BOARD EVAL FOR AD9235BCP-40AD9235BCP-20EBZ - BOARD EVAL FOR AD9235BCP-20AD9235-65PCB - BOARD EVAL FOR AD9235-65AD9235-40PCB - BOARD EVAL FOR AD9235-40AD9235-20PCB - BOARD EVAL FOR AD9235-20
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD9235BRUZ-40
Manufacturer:
AD
Quantity:
6 500
Part Number:
AD9235BRUZ-40
Manufacturer:
ADI/亚德诺
Quantity:
20 000
FEATURES
Single 3 V supply operation (2.7 V to 3.6 V)
SNR = 70 dBc to Nyquist at 65 MSPS
SFDR = 85 dBc to Nyquist at 65 MSPS
Low power: 300 mW at 65 MSPS
Differential input with 500 MHz bandwidth
On-chip reference and SHA
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
Ultrasound equipment
IF sampling in communications receivers
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
GENERAL DESCRIPTION
The AD9235 is a family of monolithic, single 3 V supply, 12-bit,
20/40/65 MSPS analog-to-digital converters (ADCs). This
family features a high performance sample-and-hold amplifier
(SHA) and voltage reference. The AD9235 uses a multistage
differential pipelined architecture with output error correction
logic to provide 12-bit accuracy at 20/40/65 MSPS data rates
and guarantee no missing codes over the full operating
temperature range.
The wide bandwidth, truly differential SHA allows a variety of
user-selectable input ranges and offsets 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 ADCs, the AD9235 is suitable for applications in
communications, imaging, and medical ultrasound.
A single-ended clock input is used to control all internal
conversion cycles. A duty cycle stabilizer (DCS) compensates
for wide variations in the clock duty cycle while maintaining
excellent overall ADC performance. The digital output data is
presented in straight binary or twos complement formats. An
out-of-range (OTR) signal indicates an overflow condition that
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.
IS-95, CDMA-One, IMT-2000
can be used with the most significant bit to determine low or
high overflow.
Fabricated on an advanced CMOS process, the AD9235 is avail-
able 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 AD9235 operates from a single 3 V power supply and
2. Operating at 65 MSPS, the AD9235 consumes a low 300 mW.
3. The patented SHA input maintains excellent performance for
4. The AD9235 pinout is similar to the AD9214-65, a 10-bit,
5. The clock DCS maintains overall ADC performance over a
6. The OTR output bit indicates when the signal is beyond the
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
SENSE
REFB
VREF
REFT
VIN+
VIN–
features a separate digital output driver supply to accommo-
date 2.5 V and 3.3 V logic families.
input frequencies up to 100 MHz and can be configured for
single-ended or differential operation.
65 MSPS ADC. This allows a simplified upgrade path from
10 bits to 12 bits for 65 MSPS systems.
wide range of clock pulse widths.
selected input range.
SHA
SELECT
REF
FUNCTIONAL BLOCK DIAGRAM
12-Bit, 20/40/65 MSPS
AGND
AVDD
A/D
© 2004 Analog Devices, Inc. All rights reserved.
0.5V
MDAC1
DUTY CYCLE
STABILIZER
AD9235
CLOCK
4
CLK
3 V A/D Converter
Figure 1.
CORRECTION LOGIC
OUTPUT BUFFERS
PIPELINE
PDWN
8-STAGE
1 1/2-BIT
16
12
DRVDD
SELECT
MODE
MODE
www.analog.com
AD9235
A/D
DGND
3
OTR
D11
D0

Related parts for AD9235BRUZ-40

AD9235BRUZ-40 Summary of contents

Page 1

FEATURES Single 3 V supply operation (2 3.6 V) SNR = 70 dBc to Nyquist at 65 MSPS SFDR = 85 dBc to Nyquist at 65 MSPS Low power: 300 MSPS Differential input with 500 ...

Page 2

AD9235 TABLE OF CONTENTS Specifications..................................................................................... 3 DC Specifications ......................................................................... 3 Digital Specifications ................................................................... 4 Switching Specifications .............................................................. 4 AC Specifications.......................................................................... 5 Absolute Maximum Ratings............................................................ 7 Explanation of Test Levels........................................................... 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 ...

Page 3

SPECIFICATIONS DC SPECIFICATIONS AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate p-p differential input, 1.0 V internal reference, T unless otherwise noted. Table 1. Parameter Temp RESOLUTION Full ACCURACY No Missing Codes Guaranteed Full Offset ...

Page 4

AD9235 DIGITAL SPECIFICATIONS Table 2. Parameter Temp LOGIC INPUTS High Level Input Voltage Full Low Level Input Voltage Full High Level Input Current Full Low Level Input Current Full Input Capacitance Full 1 LOGIC OUTPUTS DRVDD = 3.3 V High-Level ...

Page 5

ANALOG INPUT CLK DATA OUT AC SPECIFICATIONS AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate p-p differential input, A unless otherwise noted. Table 4. Parameter Temp SIGNAL-TO-NOISE RATIO f = 2.4 MHz 25°C INPUT f ...

Page 6

AD9235 Parameter Temp SPURIOUS-FREE DYNAMIC RANGE f = 2.4 MHz 25°C INPUT f = 9.7 MHz Full INPUT 25° 19.6 MHz Full INPUT 25° 32.5 MHz Full INPUT 25° 100 MHz 25°C INPUT AD9235BRU/BCP-20 ...

Page 7

ABSOLUTE MAXIMUM RATINGS Table 5. With Pin Name Respect to Min ELECTRICAL AVDD AGND –0.3 DRVDD DGND –0.3 AGND DGND –0.3 AVDD DRVDD –3.9 Digital DGND –0.3 Outputs CLK, MODE AGND –0.3 VIN+, VIN– AGND –0.3 VREF AGND –0.3 SENSE ...

Page 8

AD9235 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS OTR 1 28 D11 (MSB) MODE 2 D10 27 SENSE VREF AD9235 REFB DRVDD 5 24 TOP VIEW REFT DGND 6 23 (Not to Scale) AVDD 7 22 ...

Page 9

DEFINITIONS OF SPECIFICATIONS Analog Bandwidth (Full Power 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 ...

Page 10

AD9235 EQUIVALENT CIRCUITS AVDD VIN+, VIN– Figure 5. Equivalent Analog Input Circuit AVDD MODE 20kΩ Figure 6. Equivalent MODE Input Circuit DRVDD Figure 7. Equivalent Digital Output Circuit AVDD CLK, PDWN Figure 8. Equivalent Digital Input Circuit Rev ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS AVDD = 3.0 V, DRVDD = 2 SAMPLE unless otherwise noted. 0 –20 –40 –60 –80 –100 –120 0 6.5 13.0 19.5 FREQUENCY (MHz) Figure 9. Single Tone 8K FFT with f 0 –20 –40 ...

Page 12

AD9235 100 SFDR SINGLE-ENDED (dBFS) 90 SFDR DIFFERENTIAL (dBc) SNR 80 DIFFERENTIAL (dBFS) 70 SNR SINGLE-ENDED (dBFS) 60 SFDR SINGLE-ENDED (dBc) 50 SNR DIFFERENTIAL (dBc) 40 –30 –25 –20 –15 A (dBFS) IN Figure 15. AD9235-65: Single Tone SNR/SFDR vs. ...

Page 13

SNR = 64.6dBFS SFDR = 81.6dBFS –20 –40 –60 –80 –100 –120 32.5 39.0 45.5 52.0 FREQUENCY (MHz) Figure 21. Dual Tone 8K FFT with MHz and f IN1 0 SNR = 64.3dBFS SFDR = 81.1dBFS ...

Page 14

AD9235 75 AD9235-40: AD9235-20 SINAD 2V SINAD 69 AD9235-20: AD9235-40: 1V SINAD 1V SINAD 66 AD9235-65: 1V SINAD SAMPLE RATE (MSPS) Figure 27. SINAD vs. f with f CLK 90 SFDR: ...

Page 15

APPLYING THE AD9235 THEORY OF OPERATION The AD9235 architecture consists of a front end SHA followed by a pipelined switched capacitor ADC. The pipelined ADC is divided into three sections, consisting of a 4-bit first stage followed by eight 1.5-bit ...

Page 16

AD9235 The internal voltage reference can be pin-strapped to fixed values adjusted within the same range as discussed in the Internal Reference Connection section. Maxi- mum SNR performance is achieved with the AD9235 ...

Page 17

High speed, high resolution ADCs are sensitive to the quality of the clock input. The degradation in SNR at a given full-scale input frequency (f ) due only to aperture jitter (t INPUT calculated by SNR Degradation = −20 × ...

Page 18

AD9235 Table 7. Reference Configuration Summary Selected Mode SENSE Voltage External Reference AVDD Internal Fixed Reference VREF Programmable Reference 0 VREF Internal Fixed Reference AGND to 0.2 V DIGITAL OUTPUTS The AD9235 output drivers can be configured to ...

Page 19

External Reference Operation The use of an external reference may be necessary to enhance the gain accuracy of the ADC or to improve thermal drift characteristics. When multiple ADCs track one another, a single reference (internal or external) may be ...

Page 20

AD9235 LFCSP EVALUATION BOARD The typical bench setup used to evaluate the ac performance of the AD9235 is similar to the TSSOP Evaluation Board connections (refer to the schematics for connection details). The AD9235 can be driven single-ended or differentially ...

Page 21

FBEAD FBEAD FBEAD FBEAD Figure 44. TSSOP Evaluation ...

Page 22

AD9235 AUXCLK T1– R11 4 3 49.9Ω T2 MC100LVEL33D 8 U3 AVDD VCC NC 7 OUT INA 6 REF INB 5 VEE INCOM AVDD AVDD AVDD R12 R13 C27 U8 DECOUPLING 113Ω 113Ω ...

Page 23

C15 10µF AVDD 10V 1 2 C69 0.1µF C2 VAL R37 499Ω R34 VCC 3 –IN 523Ω VO+ AD8138 R35 2 AMP INPUT VOC U2 499Ω VO– 2 +IN R31 6 VEE 49.9Ω C18 ...

Page 24

AD9235 Figure 48. TSSOP Evaluation Board Layout, Primary Side Rev Page ...

Page 25

Figure 49. TSSOP Evaluation Board Layout, Secondary Side Rev Page AD9235 ...

Page 26

AD9235 Figure 50. TSSOP Evaluation Board Layout, Ground Plane Rev Page ...

Page 27

Figure 51. TSSOP Evaluation Board Power Plane Rev Page AD9235 ...

Page 28

AD9235 Figure 52. TSSOP Evaluation Board Layout, Primary Silkscreen Rev Page ...

Page 29

Figure 53. TSSOP Evaluation Board Layout, Secondary Silkscreen Rev Page AD9235 ...

Page 30

AD9235 R1 10kΩ C12 10kΩ 0.1µF GND GND C6 0.1µF AMPIN X OUT T1 C15 ADT 1–1 WT R10 J1 0.1µF 36Ω XFRIN1 10nH 3 4 C16 AMP ...

Page 31

2CLK 2OE CLKAT/DAC GND 26 23 2DB 2QB MSB DRX 27 22 2D7 2Q7 D13X 28 21 GND GND GND 29 20 GND 2D6 2Q6 D12X 30 19 2D5 2Q5 D11X DRVDD ...

Page 32

AD9235 Figure 56. LFCSP Evaluation Board Schematic, Clock Input Rev Page ...

Page 33

Figure 57. LFCSP Evaluation Board Layout, Primary Side Figure 58. LFCSP Evaluation Board Layout, Secondary Side Figure 59. LFCSP Evaluation Board Layout, Ground Plane Figure 60. LFCSP Evaluation Board Layout, Power Plane Rev Page AD9235 ...

Page 34

AD9235 Figure 61. LFCSP Evaluation Board Layout, Primary Silkscreen Figure 62. LFCSP Evaluation Board Layout, Secondary Silkscreen Rev Page ...

Page 35

Table 9. LFCSP Evaluation Board Bill of Materials (BOM) 1 Item Qty. Omit Reference Designator 1 18 C1, C5, C7, C8, C9, C11, C12, C13, C15, C16, C31, C33, C34, C36, C37, C41, C43, C47 8 C6, C18, C27, C17, ...

Page 36

AD9235 OUTLINE DIMENSIONS PIN 1 INDICATOR 12° MAX 1.00 0.85 0.80 SEATING PLANE 9.80 9.70 9. 4.50 4.40 4. PIN 1 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.20 SEATING COPLANARITY 0.19 0.09 ...

Page 37

... AD9235BRUZ-20 –40°C to +85°C 1 AD9235BRUZRL7-20 –40°C to +85°C AD9235BRU-40 –40°C to +85°C AD9235BRURL7-40 –40°C to +85°C 1 AD9235BRUZ-40 –40°C to +85°C AD9235BRUZRL7-40 1 –40°C to +85°C AD9235BRU-65 –40°C to +85°C AD9235BRURL7-65 –40°C to +85°C 1 AD9235BRUZ-65 – ...

Page 38

AD9235 NOTES Rev Page ...

Page 39

NOTES Rev Page AD9235 ...

Page 40

AD9235 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02461–0–10/04(C) Rev Page ...

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