IC ADC 14BIT 105MSPS 52-LQFP-PQ4

AD6645ASQ-105

Manufacturer Part NumberAD6645ASQ-105
DescriptionIC ADC 14BIT 105MSPS 52-LQFP-PQ4
ManufacturerAnalog Devices Inc
AD6645ASQ-105 datasheet
Product Change Notification
 

Specifications of AD6645ASQ-105

Rohs StatusRoHS non-compliantDesign ResourcesLow Jitter Sampling Clock Generator for High Performance ADCs Using AD9958/9858 and AD9515 (CN0109)
Number Of Bits14Sampling Rate (per Second)105M
Data InterfaceParallelNumber Of Converters4
Power Dissipation (max)1.75WVoltage Supply SourceAnalog and Digital
Operating Temperature-10°C ~ 85°CMounting TypeSurface Mount
Package / Case52-LQFP Exposed Pad, 52-eLQFP, 52-HLQFPFor Use WithAD6645-80/PCBZ - BOARD EVAL ADC 80MSPS AD6645AD6645-MIL/PCB - BOARD EVAL AD6645-MIL/PCB
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FEATURES
SNR = 75 dB, f
15 MHz, up to 105 MSPS
IN
SNR = 72 dB, f
200 MHz, up to 105 MSPS
IN
SFDR = 89 dBc, f
70 MHz, up to 105 MSPS
IN
100 dBFS multitone SFDR
IF sampling to 200 MHz
Sampling jitter: 0.1 ps
1.5 W power dissipation
Differential analog inputs
Pin compatible to AD6644
Twos complement digital output format
3.3 V CMOS compatible
Data-ready for output latching
APPLICATIONS
Multichannel, multimode receivers
Base station infrastructures
AMPS, IS-136, CDMA, GSM, W-CDMA
Single channel digital receivers
Antenna array processing
Communications instrumentation
Radars, infrared imaging
Instrumentation
GENERAL DESCRIPTION
The AD6645 is a high speed, high performance, monolithic 14-bit
analog-to-digital converter (ADC). All necessary functions,
including track-and-hold (T/H) and reference, are included on the
chip to provide a complete conversion solution. The AD6645
provides CMOS-compatible digital outputs. It is the fourth
AV
DV
CC
CC
AIN
A1
TH1
TH2
AIN
ADC1
VREF
2.4V
ENCODE
INTERNAL
TIMING
ENCODE
GND
DMID
OVR
Rev. D
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.
14-Bit, 80 MSPS/105 MSPS
generation in a wideband ADC family, preceded by the AD9042
(12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling),
and the AD6644 (14-bit, 40 MSPS/65 MSPS).
Designed for multichannel, multimode receivers, the AD6645 is
part of the Analog Devices, Inc., SoftCell® transceiver chipset.
The AD6645 maintains 100 dB multitone, spurious-free dynamic
range (SFDR) through the second Nyquist band. This breakthrough
performance eases the burden placed on multimode digital
receivers (software radios) that are typically limited by the ADC.
Noise performance is exceptional; typical signal-to-noise ratio
(SNR) is 74.5 dB through the first Nyquist band.
The AD6645 is built on the Analog Devices extra fast
complementary bipolar (XFCB) process and uses an innovative,
multipass circuit architecture. Units are available in thermally
enhanced 52-lead PowerQuad 4 (LQFP_PQ4) and 52-lead
exposed pad (TQFP_EP) packages specified from −40°C to
+85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.
PRODUCT HIGHLIGHTS
1.
IF Sampling. The AD6645 maintains outstanding ac
performance up to input frequencies of 200 MHz, suitable
for multicarrier 3G wideband cellular IF sampling receivers.
2.
Pin Compatibility. The ADC has the same footprint and
pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC.
3.
SFDR Performance and Oversampling. Multitone SFDR
performance of 100 dBFS can reduce the requirements of
high end RF components and allows the use of receive
signal processors, such as the AD6620, AD6624/AD6624A,
or AD6636.
FUNCTIONAL BLOCK DIAGRAM
AD6645
A2
TH3
TH4
DAC1
ADC2
5
DIGITAL ERROR CORRECTION LOGIC
DRY
D13
D12
D11
D10
D9
D8
MSB
Figure 1.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
A/D Converter
AD6645
TH5
ADC3
DAC2
5
D7
D6
D5
D4
D3
D2
D1
www.analog.com
©2002–2008 Analog Devices, Inc. All rights reserved.
6
D0
LSB

AD6645ASQ-105 Summary of contents

  • Page 1

    FEATURES SNR = 75 dB MHz 105 MSPS IN SNR = 72 dB, f 200 MHz 105 MSPS IN SFDR = 89 dBc MHz 105 MSPS IN 100 dBFS multitone ...

  • Page 2

    AD6645 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 DC Specifications ......................................................................... 3 Digital Specifications ................................................................... 4 AC Specifications ...

  • Page 3

    ... V ±0 ±1.0 V 2 1.5 II 4.75 5.0 II 3.0 3.3 II 275 1.5 AD8138, Rev Page AD6645ASQ-105/AD6645ASV-105 Max Min Typ Max 14 Guaranteed +10 −10 +1.2 +10 +10 −10 0 +10 +1.5 −1.0 ±0.5 +1.5 ±1.5 1.5 48 ±1.0 2.4 2.2 1 1.5 5.25 4.75 5.0 5.25 3 ...

  • Page 4

    ... V 70.0 25°C V 63.5 Rev Page AD6645ASQ-105/AD6645ASV-105 Max Min Typ 0.4 10 2.5 CMOS 2.85 DV − 0.5 0.2 Twos complement 3.3 V; ENCODE, ENCODE , AD6645ASQ-105/ AD6645ASV-105 Max Min Typ Max Unit 75 72.5 74.5 dB 72.0 73.5 dB 73.0 dB 72 72.5 74.5 dB 73 ...

  • Page 5

    ... Max Unit 96.0 dBc dBc 86.0 95.0 dBc 90.0 dBc 90.0 dBc 88.0 dBc 98.0 dBFS 98.0 dBFS 98.0 dBFS 90 dBc 270 MHz AD6645ASQ-105/ AD6645ASV-105 Max Min Typ 105 30 4.286 4.75 4.286 4.75 9.5 3.1 1.0 2 ENCH DR 9.4 5.7 6.75 7.0 2 ...

  • Page 6

    ... ENCH and t . ENCH ENCH ENCL t ENC E_FL E_DR N – – S_DR t DR Figure 2. Timing Diagram Rev Page AD6645ASQ-105/ AD6645ASV-105 Typ Max Min Typ 5 5 Note 5 Note 5 7.2 7.9 5.1 5 Note 5 Note 5 3.6 5.1 0.6 2.1 −500 −500 0.1 0 E_RL H_E and duty cycle. ...

  • Page 7

    ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Electrical AV Voltage CC DV Voltage CC Analog Input Voltage Analog Input Current Digital Input Voltage Digital Output Current Environmental Operating Temperature Range (Ambient) AD6645-80 AD6645-105 Maximum Junction Temperature Lead Temperature (Soldering, 10 sec) ...

  • Page 8

    AD6645 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ENCODE ENCODE NOTES 1. DNC = DO NOT CONNECT. 2. EXPOSED PAD. CONNECT THE EXPOSED PAD TO GND. Table 7. Pin Function Descriptions Pin Number Mnemonic 1, 33 10, ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS 0 ENCODE = 80MSPS –10 AIN = 2.2MHz @ –1dBFS SNR = 75.0dB –20 SFDR = 93.0dBc –30 –40 –50 –60 –70 –80 3 – –100 6 4 –110 –120 –130 ...

  • Page 10

    AD6645 75.5 75 –40°C 74 +85°C 74 +25°C 73.5 73.0 72.5 ENCODE = 80MSPS @ AIN = –1dBFS TEMP = –40°C, +25°C, +85°C 72 FREQUENCY (MHz) Figure 10. Signal-to-Noise ...

  • Page 11

    ENCODE = 80MSPS –10 AIN = 30.5MHz, 31.5MHz (–7dBFS) –20 NO DITHER –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 FREQUENCY (MHz) Figure 16. Two-Tone SFDR @ 30.5 MHz ...

  • Page 12

    AD6645 0 ENCODE = 80.0MSPS –10 AIN = 30.5MHz @ –29.5dBFS NO DITHER –20 –30 –40 –50 –60 –70 –80 2 –90 6 –100 3 –110 5 –120 –130 FREQUENCY (MHz) Figure 22. 1 ...

  • Page 13

    ENCODE = 76.8MSPS –10 AIN = 2W-CDMA @ 59.6MHz –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 FREQUENCY (MHz) Figure 28. Two W-CDMA Carriers @ 59.6 MHz, Encode = ...

  • Page 14

    AD6645 EQUIVALENT CIRCUITS AIN BUF 500Ω BUF 500Ω AIN BUF V CL Figure 32. Analog Input Stage LOADS 10kΩ ENCODE 10kΩ LOADS Figure 33. Encode Inputs ...

  • Page 15

    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 of ...

  • Page 16

    AD6645 Spurious-Free Dynamic Range (SFDR) The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component. The peak spurious component may or may not be a harmonic. May be reported in dBc (that is, ...

  • Page 17

    THEORY OF OPERATION The AD6645 ADC employs a three-stage subrange architecture. This design approach achieves the required accuracy and speed while maintaining low power and small die size. As shown in the functional block diagram (see Figure 1), the AD6645 ...

  • Page 18

    AD6645 This limits the amount of dynamic current from the A/D flowing back into the secondary of the transformer. The 50 Ω impedance matching can also be incorporated on the secondary side of the transformer, as shown in the evaluation ...

  • Page 19

    LAYOUT INFORMATION The schematic of the evaluation board (see Figure 43) represents a typical implementation of the AD6645. A multi- layer board is recommended to achieve best results highly recommended that high quality, ceramic chip capacitors be used ...

  • Page 20

    ... Samtec TSW-120-08-T-D-RA Johnson Components 142-0701-201 Coilcraft 1008CT-040X-J Panasonic ERJ-2RKF1000 Panasonic ERJ-8ENF60R4V Panasonic ERJ-6ENF4990V Panasonic ERJ-6ENF25R5V Panasonic ERJ-6ENF66R5V Panasonic ERJ-6ENF1000V Panasonic ERJ-2RKF1780X Panasonic ERJ-6ENF49R9V Panasonic EXB2HV101JV Mini-Circuits ADT4-1WT Analog Devices AD6645ASQ/ASV-80 Analog Devices AD6645ASQ/ASV-105 Fairchild 74LCX574WM Analog Devices AD8138AR Fairchild NC7SZ32 ...

  • Page 21

    Quantity Quantity 80 MSPS 105 MSPS Reference (U8 AC-coupled AIN is standard: R3, R4, R5, R8, and U3 are not installed. If dc-coupled AIN is required, ...

  • Page 22

    AD6645 ...

  • Page 23

    Figure 44. Top Signal Level Figure 45. 5.0 V Plane Layer 3 and 3.3 V Plane Layer 4 Figure 46. Ground Plane Layer 2 and Ground Plane Layer 5 Figure 47. Bottom Signal Layer Rev Page 23 of ...

  • Page 24

    ... VIEW A ROTATED 90 ° CCW ORDERING GUIDE Model Temperature Range AD6645ASQ-80 −40°C to +85°C 1 AD6645ASQZ-80 −40°C to +85°C 1 AD6645ASVZ-80 −40°C to +85°C AD6645ASQ-105 −10°C to +85°C 1 AD6645ASQZ-105 −10°C to +85°C 1 AD6645ASVZ-105 −10°C to +85°C 1 AD6645-80/PCBZ 1 AD6645-105/PCBZ RoHS Compliant Part. © ...