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PDF XRD64L44 Data sheet ( Hoja de datos )
| Número de pieza | XRD64L44 | |
| Descripción | Dual 10-Bit 50MSPS CMOS ADC | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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Preliminary
FEATURES
• 10-Bit Resolution
• Two Monolithic Complete 10-Bit ADCs
• 50 MSPS Conversion Rate
• On-Chip Track-and-Hold
• On-Chip Voltage Reference
• Low 5 pF Input Capacitance
• TTL/CMOS Outputs
• Tri-State Output Buffers
• Single +3V or +5V Power Supply Operation
• Low Power Dissipation: 250mW-typ @ 3.0V
• -40°C to +85°C Operation Temperature Range
XRD64L44
Dual 10-Bit 50MSPS CMOS ADC
APPLICATIONS
• Medical Ultrasound Imaging
• I & Q Modems
March 2000-1
BENEFITS
• Reduction of Components
• Reduction of System Cost
• High Performance @ Low Power Dissipation
• Long Term Time and Temperature Stability
GENERAL DESCRIPTION
The XRD64L44 is two 10-bit, monolithic, 50 MSPS
ADCs. Manufactured using a standard CMOS pro-
cess, the XRD64L44 offers low power, low cost and
excellent performance. The on-chip track-and-hold
amplifier(T/H) and voltage reference (VREF) eliminate
the need for external active components, requiring only
an external ADC conversion clock for the application.
The XRD64L44 analog input can be driven with ease
due to the high input impedance of RIN = 25KOhms
and CIN = 5pF.
The design architecture uses 17 time- interleaved 10-
bit SAR ADCs in each converter to achieve high
conversion rate of 50 MSPS minimum. In order to
insure and maintain accurate 10-bit operation with
respect to time and temperature, XRD64L44 incorpo-
rates an auto-calibration circuit which continuously
adjusts and matches the offset and linearity of each
ADC. This auto-calibration circuit is transparent to the
user after the initial 3.4ms calibration (168,000 initial
clock cycles).
The power dissipation is only 250mW at 50 MSPS and
225mW at 40 MSPS with +3.0V power supply.
The digital output data is straight binary format, and
the tri-state disable function is provided for common
bus interface.
The XRD64L44 internal reference provides cost sav-
ings and simplifies the design/development. The out-
put voltage of the internal reference is set by two
external resistors. The internal reference can be dis-
abled if an external reference is used for a power
savings of 50mW.
ORDERING INFORMATION
Part Number
XRD64L44AIV
Package Type
64-LeadTQFP
TemperatureRange
-40°C to +85°C
Rev. P1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017
1 page  
Preliminary
PIN DESCRIPTION (CONT'D)
Pin #
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Symbol
DGND
DA5
DA6
DA7
DA8
DA9
OTRA
VCMO
DGND
AGND
AVDD
AGND
AGND
VINB-
VINB+
AGND
VINA+
VINA-
AGND
AVDD
AVDD
AGND
AGND
Description
Digital Ground
Digital Output Bit 5 ADC A
Digital Output Bit 6 ADC A
Digital Output Bit 7 ADC A
Digital Output Bit 8 ADC A
Digital Output Bit 9 ADC A
Over Range Digital Output Bit ADC A
Differential Common Mode Voltage Output
Digital Ground
Analog Ground
Analog Supply Voltage
Analog Ground
Analog Ground
Analog Input B(-)
Analog Input B(+)
Analog Ground
Analog Input A(+)
Analog Input A(-)
Analog Ground
Analog Supply Voltage
Analog Supply Voltage
Analog Ground
Analog Ground
XRD64L44
Rev. P1.00
5
5 Page 
Preliminary
XRD64L44
65
60
55
50
2.8V
3.0V
2.90M Hz
3.2V
6.90M Hz
3.4V
9.90M Hz
Figure 2 - SINAD vs. Fin and Vdd @Fc =
40.0MHz, DIFFERENTIAL INPUT MODE
3.6V
0.00
-20.00
-40.00
Single Tone 8192 Point FFT
SFDR -72.66
SINAD -57.97
-60.00
-80.00
-100.00
-120.00
DC
4.0 8.1 12.1 16.1
Frequency in MHz
Figure 4 - FFT Spectrum @Fclock = 40.0MHz,
Fin = 4.0MHz, DIFFERENTIAL INPUT MODE
60
55
50
45
40
2.8V
3.0V
2.90M Hz
3.2V
6.90M Hz
3.4V
9.90M Hz
Figure 6 - SINAD vs. Fin and Vdd @Fc =
40.0MHz, SINGLE-ENDED INPUT MODE
3.6V
60.00
55.00
50.00
45.00
40.00
3.0V
Fclk = 50.0MHz
Fclk = 56.7MHz
3.2V
3.4V
3.6V
Fclk = 53.3MHz
Fclk = 60.0MHz
Figure 3 - SINAD vs. Fclock and Vdd DIFFEREN-
TIAL INPUT MODE
0.00
-20.00
-40.00
Single Tone 8192 Point FFT
SFDR -69.77
SINAD -57.11
-60.00
-80.00
-100.00
-120.00
DC 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0
Frequency in MHz
Figure 5 - FFT Spectrum @Fclock = 40.0MHz,
Fin = 10.0MHz, DIFFERENTIAL INPUT MODE
0.00
-20.00
-40.00
-60.00
-80.00
-100.00
-120.00
DC
Single Tone 8192 Point FFT
SFDR -62.57
SINAD -55.25
4.0 8.1 12.1 16.1
Frequency in MHz
Figure 7 - FFT Spectrum @Fclock = 40.0MHz,
Fin = 4.0MHz, Single-ended INPUT MODE
Rev. P1.00
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet XRD64L44.PDF ] | |
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