CMOS
6 MSPS, 10-Bit, High Speed
Analog-to-Digital Converter
FEATURES
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10-Bit Resolution
Sampling Rate to 6 MSPS
DNL = +1 LSB, INL = +2 LSB
Internal S/H Function
Single 5V Power Supply
V
IN
DC Range: 0V to V
DD
V
REF
DC Range: 1V to V
DD
Low Power: 65mW
Three-State Digital Outputs
Latch-Up Free
Pin Compatible With: MP8784
APPLICATIONS
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Digital Color Copiers
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Precision CCDs and Scanners
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Digital Radio
BENEFITS
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Simplified Analog Design
Rugged
Few External Components, no S/H Needed
Reduced Board Space
June 1998-2
XRD6406
GENERAL DESCRIPTION
The XRD6406 is a 10-bit, 6 MSPS, Analog-to-Digital
Converter 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 XRD6406 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 XRD6406
includes an on-chip S/H function that allows this part to
digitize analog input signals between AGND and AV
DD
.
The designer can choose the internally generated
reference voltages, or provide external reference
voltages to the V
RB
and V
RT
pins. The internal reference
generates 1.0V at V
RB
and 4V at V
RT
. Providing external
reference voltages allows easy interface to any input
signal range between GND and V
DD
. This also allows the
system to cancel zero scale and full scale errors. The
Reference Ladder taps (R1 to R3) can be used to
externally trim any INL errors.
This device operates from a single 5V supply. Power
consumption from a 5V supply is typically 65mW at
F
S
=6MHz.
SIMPLIFIED BLOCK DIAGRAM
AV
DD
V
DD
V
RTS
V
RT
R1-R3
V
RB
V
RBS
S/H
V
IN
Clock
Logic
CLK
OE
DV
DD
DGND
3
MSB
Comparators
Latch
Encoder
LSB
Comparators
Latch
F/F
DB0 (LSB)
DB9 (MSB)
AGND
Rev. 1.00
E1998
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
(510) 668-7017
EXAR [ EXAR CORPORATION ]
