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PDF XRD6414 Data sheet ( Hoja de datos )
| Número de pieza | XRD6414 | |
| Descripción | CMOS 10-Bit/ 20 MSPS/ High Speed Analog-to-Digital Converter with 4:1 Input Analog Multiplexer | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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XRD6414
CMOS 10-Bit, 20 MSPS, High Speed
Analog-to-Digital Converter
...the analog plus companyTM with 4:1 Input Analog Multiplexer
FEATURES
D 10-Bit Resolution
D 20MHz Sampling Rate
D 4:1 Analog Input Multiplexer
D Internal S/H Function
D Single 5.0V Power Supply
D VIN DC Range: 0V to VDD
D VREF DC Range: 1V to VDD
D Low Power: 120mW (typ)
D Three-State Digital Outputs
D Power Down: 1.5mW (typ) Power Dissipation
D ESD Protection: 2000V Minimum
D For 3V Operation Refer to XRD64L14
APPLICATIONS
D Multiplexed Data Acquisition
D Precision Scanners
D Digital Color Copiers
D Test and Scientific Instruments
D Digital Cameras
D Medical Imaging
D IR Imaging
March 1997–3
BENEFITS
D Complete Analog-to-Digital Converter (ADC) that
Requires no External Active Components
D Small Outline Package to Reduce Board Space
D Low Power Dissipation
D Easy to Use Rugged Design
GENERAL DESCRIPTION
The XRD6414 is a 10-bit, 20 MSPS, Analog-to-Digital
Converter (ADC) with a 4:1 Analog Input Multiplexer for
applications that require high speed and high accuracy.
Designed using an advanced CMOS process, this part
offers excellent performance, low power consumption
and latch-up free operation.
The XRD6414 uses a subranging architecture to maintain
low power consumption at high conversion rates. Our
proprietary comparator design achieves a low analog
input capacitance. The input circuitry of the XRD6414
includes an on-chip S/H function that allows the product to
digitize analog input signals between AGND and AVDD.
The XRD6414 can be placed into power down (stand-by)
mode, reducing the power dissipation to 1.5mW (typical)
by a digitally controlled pin.
Providing external reference voltages allows easy
interface to any input signal range between AGND and
AVDD. This also allows the system to calibrate out zero
scale and full scale errors by adjusting VRT and VRB. A
separate power supply pin, DVDD, sets the output logic
levels for 3V or 5V interface.
This device operates from a single 5.0V supply. Power
consumption from a 5.0V supply is typically 120mW at
FS=15MHz. For 3.3V power supply operation refer to
XRD64L14.
ORDERING INFORMATION
Part No.
XRD6414AIQ
Package
32 Lead TQFP (7 x 7 x 1.4 mm)
Operating
Temperature Range
–40°C to +85°C
Rev. 1.00
E1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1 page  
XRD6414
ELECTRICAL CHARACTERISTICS (CONT’D)
Symbol
Parameter
Digital Inputs
VIH Digital Input High Voltage
VIL Digital Input Low Voltage
IIN DC Leakage Currents6
CLK, OE, PD, A0, A1
Input Capacitance
Digital Outputs
VOH
VOL
IOZ
tDL
tDEN
tDHZ
Output High Voltage
Output Low Voltage
High-Z Leakage
Data Valid Delay2
Data Enable Delay
Data High-Z Delay
Pipeline Delay (Latency)
Power Supplies
IDD(PD) Power Down (IDD)
AVDD
DVDD
IDD
Operating Voltage7,8
Logic Power Supply9
Supply Current (IDD)
Min. Typ. Max. Unit
Conditions
3.5 V
1.5 V
5 mA Between AGND and AVDD
5 pF
4.5 V
0.4 V
–10 10 mA OE = high, or PD = high
10 12 14
ns
10 12 14
ns
7 8 9 ns
3 cycles Time delay between CLK and data
output
0.3 0.5 mA PD = high, excluding current
through reference ladder
4.5 5.0 5.5
V
2.7 5.5 V
24 32 mA PD = low
Notes
1 Tester measures code transitions by dithering the voltage of the analog input (VIN). The difference between the measured and the
ideal code width (VREF/1024) is the DNL error. The INL error is the maximum distance (in LSBs) from the best fit line to
any transition voltage. Accuracy is a function of the sampling rate (FS).
2 Specified values guarantee functionality. Refer to other parameters for accuracy.
3 Guaranteed. Not tested.
4 –1 dB bandwidth is a measure of performance of the A/D input stage (S/H + amplifier). Refer to other parameters for accuracy
within the specified bandwidth.
5 See VIN equivalent circuit. Switched capacitor analog input requires driver with low output resistance.
6 All inputs have diodes to AVDD and AGND. Input DC currents will not exceed specified limits for any input voltage between AGND
and AVDD.
7 The GND pins are connected through the silicon substrate. Connect all GND pins together at the package and to the analog
ground plane. DGND and GND are connected through junction diodes. See logic output interface section.
8 The VDD pins should be tied together at the package.
9 See logic output interface section.
Specifications are subject to change without notice
Rev. 1.00
5
5 Page 
XRD6414
A1 A0
00
01
10
11
Selected Analog Input
AIN1
AIN2
AIN3
AIN4
Table 2. Truth Table for Analog Input Selection
PD Device Status
1 Off (Not Operating)
0 On (Operating)
Table 3. Power Down
AVDD (5 V)
5V or
3V
26pF
10MW
AGND
JP15
(2,3)
AIN1
AIN2
A1
A0
AOUT
VIN
XRD6414
50Ω
Figure 13. MUX Switching Time Test Circuit
–78
–80
–82
–84
–86
–88
–90
–92
–94
–96
–98
–100
–102
–104
–106
–108
–110
–112
–114
0.00
2.00 4.00
FIN(MHz)
6.00
Figure 14. XRD6414 Crosstalk,
AVDD = 5V and VIN = 8dBm
Rev. 1.00
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet XRD6414.PDF ] | |
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