AD7654 Datasheet, PDF (1/24 Pages) Analog Devices – Dual 2-Channel Simultaneous Sampling SAR 500 kSPS 16-Bit ADC

Dual 2-Channel Simultaneous Sampling
SAR 500 kSPS 16-Bit ADC
AD7654^*
FEATURES
Dual 16-Bit 2-Channel Simultaneous Sampling ADC
16 Bits Resolution with No Missing Codes
Throughput:
500 kSPS (Normal Mode)
444 kSPS (Impulse Mode)
INL: ؎3.5 LSB Max (؎0.0053% of Full Scale)
SNR: 89 dB Typ @ 100 kHz
THD: –100 dB @ 100 kHz
Analog Input Voltage Range: 0 V to 5 V
No Pipeline Delay
Parallel and Serial 5 V/3 V Interface
SPI™/QSPI™/MICROWIRE™/DSP Compatible
Single 5 V Supply Operation
Power Dissipation
120 mW Typical,
2.6 mW @ 10 kSPS
Package: 48-Lead Quad Flatpack (LQFP)
or 48-Lead Frame Chip Scale Package (LFCSP)
Low Cost
APPLICATIONS
AC Motor Control
3-Phase Power Control
4-Channel Data Acquisition
Uninterrupted Power Supplies
Communications
GENERAL DESCRIPTION
The AD7654 is a low cost, dual-channel, 16-bit, charge
redistribution SAR, analog-to-digital converter that operates
from a single 5 V power supply. It contains two low noise, wide
bandwidth track-and-hold amplifiers that allow simultaneous
sampling, a high speed 16-bit sampling ADC, an internal con-
version clock, error correction circuits, and both serial and parallel
system interface ports. Each track-and-hold has a multiplexer in
front to provide a 4-channel input ADC.
The part features a very high sampling rate mode (Normal) and,
for low power applications, a reduced power mode (Impulse)
where the power is scaled with the throughput. It is available in
48-lead LQFP or 48-lead LFCSP packages with operation
specified from –40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Simultaneous Sampling
The AD7654 features two sample-and-hold circuits that
allow simultaneous sampling. It provides 4-channel inputs.
*Patent pending
SPI and QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
REV. 0
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REFGND REFx
INA1
INAN
INA2
A0
INB1
INBN
INB2
PD
RESET
TRACK/HOLD
؋2
MUX
MUX ^SWITCHED
CAP DAC
MUX
CLOCK AND
CONTROL LOGIC
AD7654
IMPULSE
CNVST
DVDD DGND
SERIAL
PORT
16
PARALLEL
INTERFACE
OVDD
OGND
SER/PAR
EOC
BUSY
D[15:0]
CS
RD
A/B
BYTESWAP
PulSAR Selection
Type/kSPS
Pseudo
Differential
100–250
AD7651
AD7660/
AD7661
True Bipolar
True Differential
18 Bit
Multichannel/
Simultaneous
AD7663
AD7675
AD7678
500–570
AD7650/
AD7652
AD7664/
AD7666
AD7665
AD7676
AD7679
AD7654
800–1000
AD7653
AD7667
AD7671
AD7677
AD7674
2. Fast Throughput
The AD7654 is a very high speed (500 kSPS in Normal
Mode and 444 kSPS in Impulse Mode), charge redistribution,
16-bit SAR ADC that avoids pipeline delay.
3. Superior INL and No Missing Code
The AD7654 has a maximum integral nonlinearity of 3.5 LSB
with no missing codes at the 16-bit level.
4. Single-Supply Operation
The AD7654 operates from a single 5 V supply and dissipates
only 120 mW typical, even lower when a reduced throughput
is used with the reduced power mode (Impulse) and power-
down mode.
5. Serial or Parallel Interface
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V or 5 V logic.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
© Analog Devices, Inc., 2002