Dual 2-Channel Simultaneous Sampling
SAR 500 kSPS 16-Bit ADC
AD7654*
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
AVDD AGND
REFGND REFx
DVDD DGND
TRACK/HOLD
OVDD
OGND
INA1
INAN
INA2
A0
MUX
SERIAL
PORT
SER/PAR
SWITCHED
CAP DAC
EOC
MUX
INB1
INBN
INB2
PD
BUSY
D[15:0]
CS
MUX
16
PARALLEL
INTERFACE
CLOCK AND
CONTROL LOGIC
RD
RESET
A/B
AD7654
BYTESWAP
IMPULSE
CNVST
120 mW Typical,
2.6 mW @ 10 kSPS
Package: 48-Lead Quad Flatpack (LQFP)
or 48-Lead Frame Chip Scale Package (LFCSP)
Low Cost
PulSAR Selection
Type/kSPS
100–250
500–570
800–1000
APPLICATIONS
AC Motor Control
3-Phase Power Control
4-Channel Data Acquisition
Uninterrupted Power Supplies
Communications
Pseudo
Differential
AD7651
AD7660/
AD7661
AD7650/
AD7652
AD7664/
AD7666
AD7653
AD7667
True Bipolar
AD7663
AD7665
AD7676
AD7679
AD7654
AD7671
AD7677
AD7674
True Differential AD7675
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.
18 Bit
AD7678
Multichannel/
Simultaneous
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 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.
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.
PRODUCT HIGHLIGHTS
1. Simultaneous Sampling
The AD7654 features two sample-and-hold circuits that
allow simultaneous sampling. It provides 4-channel inputs.
5. Serial or Parallel Interface
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V or 5 V logic.
*Patent pending
SPI and QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
REV. 0
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may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2002