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Exar Corporation

XRD8799 Datasheet Preview

XRD8799 Datasheet

A/D CONVERTER

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XRD8799
FEBRUARY 2001
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.00
FEATURES
10-Bit Resolution
8-Channel Mux
Sampling Rate - < 1kHz - 2MHz
Low Power CMOS - 35 mW (typ)
Power Down; Lower Consumption - 0.8 mW (typ)
Input Range between GND and VDD
No S/H Required for Analog Signals less than
100kHz
No S/H Required for CCD Signals less than 2MHz
Single Power Supply (4.5 to 5.5V)
Latch-Up Free
ESD Protection: 2000 Volts Minimum
APPLICATIONS
µP/DSP Interface and Control Application
High Resolution Imaging - Scanners & Copiers
Wireless Digital Communications
Multiplexed Data Acquisition
BENEFITS
Reduced Board Space (Small Package)
Reduced External Parts, No Sample/Hold Needed
Suitable for Battery & Power Critical Applications
Designer can Adapt Input Range & Scaling
GENERAL DESCRIPTION
The XRD8799 is a flexible, easy to use, precision 10-
bit analog-to-digital converter with 8-channel mux that
operates over a wide range of input and sampling
conditions. The XRD8799 can operate with pulsed
"on demand" conversion operation or continuous
"pipeline" operation for sampling rates up to 2MHz.
The elimination of the S/H requirements, very low
power, and small package size offer the designer a
low cost solution. No sample and hold is required for
CCD applications up to 2MHz, or multiplexed input
applications when the signal source bandwidth is lim-
ited to 100kHz. The input architecture of the
XRD8799 allows direct interface to any analog input
range between AGND and AVDD (0 to 1V, 1 to 4V, 0 to
5V, etc.). The user simply sets VREF(+) and VREF(-) to
encompass the desired input range.
Scaled reference resistor taps @ 1/4 R, 1/2 R and 3/4
R allow for customizing the transfer curve as well as
providing a 1/2 span reference voltage. Digital out-
puts are CMOS and TTL compatible.
The XRD8799 uses a two-step flash technique. The
first segment converts the 5 MSBs and consists of
autobalanced comparators, latches, an encoder, and
buffer storage registers. The second segment con-
verts the remaining 5 LSBs.
When the power down input is "high", the data out-
puts DB9 to DB0 hold the current values and VREF(-) is
disconnected from VREF1(-). The power consumption
during the power down mode is 0.1mW.
ORDERING INFORMATION
PART NUMBER
XRD8799AIQ
PACKAGE
PQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRD8799 Datasheet Preview

XRD8799 Datasheet

A/D CONVERTER

No Preview Available !

XRD8799
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.00
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM AND TIMING
xr
AVDD
AVDD DVDD
VREF(+)
R3
R2
R1
VREF(-)
PD
VREF1(-)
AIN1
AIN8
Coarse
Comparators
φB
5
Adder
6
Fine
Resolution
Comparators
5
DFF
10
Ladder
1 or 8
MUX
φS
8
3 to 8
Decoder
Latch
AGND
DGND
FIGURE 2. PIN OUT OF THE XRD8799
OFW
DB9-DB0
OE
φS φB
CLK
N
DB9-DB0
OFW
N-1
N-1
CLK
CLR
WR
A2
A1
A0
N
N
PIN CONFIGURATIONS
See Packaging Section for
Package Dimensions
34
33
23
22
Index
44
12
1 11
44-Pin PQFP (10mm x 10mm)
2


Part Number XRD8799
Description A/D CONVERTER
Maker Exar Corporation
Total Page 23 Pages
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