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PDF AD6645 Data sheet ( Hoja de datos )
| Número de pieza | AD6645 | |
| Descripción | 80 MSPS/105 MSPS A/D Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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14-Bit, 80 MSPS/105 MSPS
A/D Converter
AD6645
FEATURES
SNR = 75 dB, fIN 15 MHz, up to 105 MSPS
SNR = 72 dB, fIN 200 MHz, up to 105 MSPS
SFDR = 89 dBc, fIN 70 MHz, up to 105 MSPS
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
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.
AVCC
DVCC
FUNCTIONAL BLOCK DIAGRAM
AIN
A1 TH1
AIN
TH2
AD6645
A2 TH3
TH4
TH5 ADC3
VREF
2.4V
ENCODE
ENCODE
INTERNAL
TIMING
ADC1
DAC1
5
ADC2
DAC2
5
DIGITAL ERROR CORRECTION LOGIC
6
GND
DMID OVR DRY D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
MSB
LSB
Figure 1.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2002–2008 Analog Devices, Inc. All rights reserved.
1 page  
AD6645
DIGITAL SPECIFICATIONS
AVCC = 5 V, DVCC = 3.3 V; TMIN and TMAX at rated speed grade, unless otherwise noted.
Table 2.
Parameter
ENCODE INPUTS (ENCODE, ENCODE)
Differential Input Voltage1
Differential Input Resistance
Differential Input Capacitance
LOGIC OUTPUTS (D13 to D0, DRY, OVR)
Logic Compatibility
Logic 1 Voltage (DVCC = 3.3 V)2
Logic 0 Voltage (DVCC = 3.3 V)2
Output Coding
DMID
Temp
Full
25°C
25°C
Full
Full
Full
Test
Level
IV
V
V
II
II
V
AD6645ASQ-80/AD6645ASV-80
Min Typ
Max
0.4
10
2.5
CMOS
2.85 DVCC − 2
0.2 0.5
Twos complement
DVCC/2
AD6645ASQ-105/AD6645ASV-105
Min Typ
Max
0.4
10
2.5
CMOS
2.85 DVCC − 2
0.2
Twos complement
DVCC/2
0.5
Unit
V p-p
kΩ
pF
V
V
V
1 All ac specifications tested by driving ENCODE and ENCODE differentially.
2 Digital output logic levels: DVCC = 3.3 V, CLOAD = 10 pF. Capacitive loads >10 pF degrades performance.
AC SPECIFICATIONS
All ac specifications tested by driving ENCODE and ENCODE differentially. AVCC = 5 V, DVCC = 3.3 V; ENCODE, ENCODE, TMIN and
TMAX at rated speed grade, unless otherwise noted.
Table 3.
Parameter
SNR
Analog Input @ −1 dBFS
SINAD
Analog Input @ −1 dBFS
WORST HARMONIC (SECOND OR THIRD)
Analog Input @ −1 dBFS
Temp
Test
Level
AD6645ASQ-80/
AD6645ASV-80
Min Typ Max
AD6645ASQ-105/
AD6645ASV-105
Min Typ Max
Unit
Conditions
25°C V
Full II
25°C I
Full II
25°C V
25°C V
75.0
72.5 74.5
72.0 73.5
73.0
72.0
75.0
72.5 74.5
72.0 73.5
73.0
72.0
dB At 15.5 MHz
dB At 30.5 MHz
dB At 37.7 MHz
dB At 70.0 MHz
dB At 150.0 MHz
dB At 200.0 MHz
25°C V
Full II
25°C I
Full V
25°C V
25°C V
75.0
72.5 74.5
73.0
68.5
62.5
75.0
72.5 74.5
73.0
67.5
62.5
dB At 15.5 MHz
dB At 30.5 MHz
dB At 37.7 MHz
dB At 70.0 MHz
dB At 150.0 MHz
dB At 200.0 MHz
25°C V
Full II
25°C I
Full V
25°C V
25°C V
93.0
85.0 93.0
89.0
70.0
63.5
93.1
85.0 93.0
87.0
70.0
63.5
dBc At 15.5 MHz
dBc At 30.5 MHz
dBc At 37.7 MHz
dBc At 70.0 MHz
dBc At 150.0 MHz
dBc At 200.0 MHz
Rev. D | Page 4 of 24
5 Page 
AD6645
75.5
75.0
T = –40°C
74.5
T = +85°C
74.0
T = +25°C
73.5
73.0
72.5
ENCODE = 80MSPS @ AIN = –1dBFS
TEMP = –40°C, +25°C, +85°C
72.0
0 10 20 30 40
FREQUENCY (MHz)
50
60
Figure 10. Signal-to-Noise Ratio (SNR) vs. Frequency
70
94
92
90 T = +25°C
88 T = –40°C, +85°C
86
84
82
ENCODE = 80MSPS @ AIN = –1dBFS
TEMP = –40°C, +25°C, +85°C
80
0 10 20 30 40
50
ANALOG INPUT FREQUENCY (MHz)
60
70
Figure 11. Worst-Case Harmonics vs. Analog Input Frequency
76
75
74
73
72
71
ENCODE = 80MSPS @ AIN = –1dBFS
TEMP = 25°C
70
0 20 40 60 80 100 120 140 160 180 200
ANALOG FREQUENCY (MHz)
Figure 12. Signal-to-Noise Ratio (SNR) vs. Analog Frequency (IF)
100
95
WORST OTHER SPUR
90
85
80
HARMONICS
75 (SECOND, THIRD)
70
65
ENCODE = 80MSPS @ AIN = –1dBFS
TEMP = 25°C
60
0 20 40 60
80 100 120 140 160 180
ANALOG FREQUENCY (MHz)
Figure 13. Harmonics vs. Analog Frequency (IF)
200
120
110
dBFS
100
90 ENCODE = 80MSPS
80 AIN = 30.5MHz
70
60 dBc
50
40
SFDR = 90dB
REFERENCE LINE
30
20
10
0
–90 –80 –70 –60 –50 –40 –30 –20 –10
ANALOG INPUT POWER LEVEL (dBFS)
Figure 14. Single-Tone SFDR @ 30.5 MHz
0
120
110
dBFS
100
90 ENCODE = 80MSPS
80 AIN = 69.1MHz
70
60 dBc
50 SFDR = 90dB
REFERENCE LINE
40
30
20
10
0
–90 –80 –70 –60 –50 –40 –30 –20 –10
ANALOG INPUT POWER LEVEL (dBFS)
Figure 15. Single-Tone SFDR @ 69.1 MHz
0
Rev. D | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD6645.PDF ] | |
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