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XRD87L94AID Datasheet

  • XRD87L94AID

  • Analog-to-Digital Converter， 12-Bit

  • 16頁

  • ETC

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XRD87L94
...the analog plus company
TM
CMOS, 1 MSPS, 12-Bit
Analog-to-Digital Converter
with Parallel Logic Interface Port
March 1996-3
FEATURES












12-Bit ADC with DNL = +1 LSB, INL = +2.5 LSB
SNR > 60 dB
Sampling Frequency < 1 MHz
Single 3.3 V Supply
Rail-to-Rail Input Range
V
REF
Range: 1.5 V to V
DD
CMOS Low Power: 30 mW (typ)
1/4, 1/2 and 3/4 Scale Reference Resistor Taps
Three-State Outputs
Binary and Two鈥檚 Complement Digital Output Mode
Latch-Up Proof
ESD: 2000 V Minimum Protection
APPLICATIONS






Scanners
Digital Cameras
Instrumentation
Medical Imaging
Digital Oscilloscopes
Spectrum Analysis
GENERAL DESCRIPTION
The XRD87L94 is a 1 MSPS 12-bit subranging
Analog-to-Digital Converter with DNL = +1 LSB and INL = +2.5
LSB. The XRD87L94 contains an internal track and hold and an
analog input bandwidth of 10 MHz.
The XRD87L94 operates with a single 3.3 V supply while
consuming 30 mW of power (typical). Separate pins for
reference ladder terminals and power supplies allow flexibility
for various A
IN
, V
REF
, and power supply ranges.
Data is presented at the parallel output port every clock cycle
after a 2.5 cycle pipeline delay from sample edge. The digital
output port is also equipped with a 3-state function. MINV
enables binary and 2鈥檚 complement data formatting. Through
pins R1-R3, transfer function adjustment can be
accommodated.
SIMPLIFIED BLOCK DIAGRAM
MINV
A
IN
V
RT
3
R1-R3
n
n1
Fine
Comp.
n1
L
A
T
C
H
m
R
O
M
1
11
L
A
T
C
H
12
12
DB0-DB11
S/H
n2
Coarse
Comp.
n2
V
RB
Aperture
CLK
3
AV
DD
3
AGND
Clock Logic
OE
Rev. 1.00
E1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017

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