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AD7654
*
Dual 2-Channel Simultaneous Sampling
SAR 500 kSPS 16-Bit ADC
*Patent pending
SPI and QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
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: H115503.5 LSB Max (H115500.0053% 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
FUNCTIONAL BLOCK DIAGRAM
CLOCK AND
CONTROL LOGIC
A/B
16
D[15:0]
BUSY
CS
SER/PAR
OGND
OVDD
DGNDDVDD
SERIAL
PORT
PARALLEL
INTERFACE
BYTESWAP
RD
AVDD AGND REFxREFGND
PD
RESET
CNVST
INAN
SWITCHED
CAP DAC
AD7654
INA1
TRACK/HOLD
H115472
IMPULSE
MUX
MUX
EOC
MUX
INA2
A0
INB1
INBN
INB2
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.
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.
PulSAR Selection
Type/kSPS 100–250 500–570 800–1000
Pseudo AD7651 AD7650/ AD7653
Differential AD7660/ AD7652 AD7667
AD7661 AD7664/
AD7666
True Bipolar AD7663 AD7665 AD7671
True Differential AD7675 AD7676 AD7677
18 Bit AD7678 AD7679 AD7674
Multichannel/ AD7654
Simultaneous