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Analog Devices Semiconductor Electronic Components Datasheet

AD7482 Datasheet

3MSPS/ 12-Bit SAR ADC

No Preview Available !

AD7482 pdf
7/5/01 5 PM
PRELIMINARY TECHNICAL DATA
=
3MSPS,
12-Bit SAR ADC
Preliminary Technical Data
AD7482
FEATURES
Fast Throughput Rate: 3MSPS
Wide Input Bandwidth: 50MHz
No Pipeline Delays with SAR ADC
Excellent DC Accuracy Performance
Two Parallel Interface Modes
Low Power:
90mW (Full-Power) and 5mW (NAP Mode)
Standby Mode: 1µA max
Single +5V Supply Operation
Internal +2.5V Reference
Full-Scale Overrange Mode (using 13th bit)
System Offset Removal via User Access Offset Register
Nominal 0 to +2.5V Input with Shifted Range Capability
14-Bit Pin Compatible Upgrade (AD7484)
GENERAL DESCRIPTION
The AD7482 is a 12-bit, high speed, low power, succes-
sive-approximation ADC. The part features a parallel
interface with throughput rates of up to 3MSPS. The part
contains a low-noise, wide bandwidth track/hold amplifier
which can handle input frequencies in excess of 50MHz.
The conversion process is a proprietary algorithmic suc-
cessive-approximation technique which results in no
pipeline delays. The input signal is sampled and a conver-
sion is initiated on the falling edge of a CONVST signal.
The conversion process is controlled via an internally
trimmed oscillator. Interfacing is via standard parallel
signal lines making the part directly compatible with
microcontrollers and DSPs.
The AD7482 provides excellent ac and dc performance
specifications. Factory trimming ensures high dc accuracy
resulting in very low INL, offset and gain errors.
The part uses advanced design techniques to achieve very
low power dissipation at high throughput rates. Power
consumption in normal mode of operation is 90mW.
There are two power-saving modes: a NAP mode, which
keeps the reference circuitry alive for a quick power up
while consuming 5mW and a STANDBY mode which
reduces power consumption to a mere 5µW.
FUNCTIONAL BLOCK DIAGRAM
VREF3
AVDD AGND CBIAS DVDD DGND
BUF
2.5V
REFERENCE
VREF1
VREF2
VIN T/H
12-Bit Error
Correcting SAR
AD7482
MODE1
MODE2
CLIP
NAP
STBY
RESET
CONVST
VDRIVE
CONTROL
LOGIC AND I/O
REGISTERS
D12
D11
D10
D9
D8
D7
The AD7482 features an on-board +2.5V reference but
the part can also accomodate an externally provided
+2.5V reference source. The nominal analog input range
is 0 to +2.5V but an offset shift capability allows this
nominal range to be offset by +/-200mV. This allows the
user considerable flexibility in setting the bottom end
reference point of the signal range, a useful feature when
using single-supply op-amps.
The AD7482 also provides the user with an 8% overrange
capability via a 13th bit. Thus, if the analog input range
strays outside the nominal by up to 8%, the user can still
accurately resolve the signal by using the 13th bit.
The AD7482 is powered from a +4.75V to +5.25V sup-
ply. The part also provides a VDRIVE pin which allows the
user to set the voltage levels for the digital interface lines.
The range for this VDRIVE pin is from +2.7V to +5.25V.
The part is housed in a 48-pin LQFP package and is
specified over a -40°C to +85°C temperature range.
REV. PrC
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001


Analog Devices Semiconductor Electronic Components Datasheet

AD7482 Datasheet

3MSPS/ 12-Bit SAR ADC

No Preview Available !

AD7482 pdf
7/5/01 5 PM
PRELIMINARY TECHNICAL DATA
AD7482–SPECIFICATIONS
(TA = 25؇C, VDD = 4.75 V to 5.25 V, VDRIVE = 2.7 V to 5.25 V,
fSAMPLE = 3MSPS)
Parameter
DYNAMIC PERFORMANCE
Signal to Noise + Distortion (SINAD)2
Signal to Noise Ratio (SNR)2
Total Harmonic Distortion (THD)2
Peak Harmonic or Spurious Noise (SFDR)2
Intermodulation Distortion (IMD)2
Second Order Terms
Third Order Terms
Aperture Delay
Aperture Jitter
Full Power Bandwidth
DC ACCURACY
Resolution
Integral Nonlinearity2
Differential Nonlinearity2
Offset Error2
Gain Error2
ANALOG INPUT
Input Voltage
DC Leakage Current
Input Capacitance
REFERENCE INPUT/OUTPUT
VREF Input Voltage
VREF Input DC Leakage Current
VREF Input Capacitance
VREF Output Voltage
VREF Error @ 25°C
VREF Error TMIN to TMAX
VREF Output Impedance
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN2
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output Capacitance2,3
Output Coding
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
VDD
VDRIVE
IDD Normal Mode (Static)
Normal Mode (Operational)
NAP Mode
Standby Mode
REV. PrC
Specification
74
74
-85
TBD
TBD
TBD
10
10
50
TBD
Units
dB min
dB min
dB max
dB max
Test Conditions/Comments
FIN = 100kHz Sine Wave
dB typ
dB typ
ns typ
ps typ
MHz typ
MHz typ
@ 3 dB
@0.1 dB
12
TBD
±1
TBD
±1
±1.5
±1.5
Bits
LSB max
LSB typ
LSB max
LSB typ
LSB max
LSB max
Guaranteed No Missed Codes to 12 bits
-200
+2.7
TBD
10
mV min
Volts max
µA max
pF typ
+2.5
±1
TBD
+2.5
TBD
TBD
TBD
Volts
µA max
pF max
V nom
mV max
mV max
ktyp
±1% for specified performance
TBD
0.4
TBD
TBD
V min
V max
µA max
pF max
VDRIVE - 0.2
0.4
V min
V max
TBD
µA max
TBD
pF max
Straight (Natural) Binary
TBD
TBD
TBD
3
ns max
ns max Sine Wave Input
ns max Full-Scale Step Input
MSPS max
+5
+2.7
+5.25
TBD
18
1
1
–2–
Volts
V min
V max
mA typ
mA typ
mA typ
µA max
±5%


Part Number AD7482
Description 3MSPS/ 12-Bit SAR ADC
Maker Analog Devices
Total Page 12 Pages
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