AD9235BRUZ-20 Analog Devices Inc, AD9235BRUZ-20 Datasheet
AD9235BRUZ-20
Specifications of AD9235BRUZ-20
Available stocks
Related parts for AD9235BRUZ-20
AD9235BRUZ-20 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
... ORDERING GUIDE Model Temperature Range AD9235BRU-20 –40°C to +85°C AD9235BRURL7-20 –40°C to +85°C 1 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 – ...
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 ...