16-Bit, 500 kSPS PulSAR® Dual,
2-Channel, Simultaneous Sampling ADC
AD7654
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Dual, 16-bit, 2-channel simultaneous sampling ADC
16-bit resolution with no missing codes
AVDD AGND
REFGND REFx
DVDD DGND
TRACK/HOLD
×2
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
OVDD
OGND
D[15:0]
INA1
INAN
INA2
A0
SERIAL
PORT
MUX
MUX
16
SWITCHED
CAP DAC
MUX
SER/PAR
EOC
INB1
INBN
INB2
PD
BUSY
CS
CLOCK
PARALLEL
INTERFACE
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
RD
RESET
A/B
AD7654
BYTESWAP
IMPULSE
CNVST
Power dissipation:
120 mW typical
Figure 1.
2.6 mW @ 10 kSPS
Packages:
Table 1. PulSAR Selection
48-lead low profile quad flat package (LQFP)
48-lead lead frame chip scale package (LFCSP)
Low cost
Type/kSPS
100 to 250
500 to 570 800 to 1000 >1000
Pseudo
Differential
AD7660/
AD7661
AD7653
AD7650/
AD7652
AD7664/
AD7666
AD7667
True Bipolar
AD7663
AD7675
AD7665
AD7676
AD7671
AD7677
APPLICATIONS
AC motor control
True Differential
AD7621
AD7623
AD7641
3-phase power control
4-channel data acquisition
Uninterrupted power supplies
Communications
18-Bit
AD7678
AD7679
AD7654
AD7674
AD7655
Multichannel/
Simultaneous
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD7654 is a low cost, simultaneous sampling, 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 conversion 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 A0 multiplexer control input
allows the choice of simultaneously sampling input pairs
INA1/INB1 (A0 = low) or INA2/INB2 (A0 = high). 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. Operation is specified
from −40°C to +85°C.
1. Simultaneous Sampling.
The AD7654 features two sample-and-hold circuits that
allow simultaneous sampling. It provides inputs for four
channels.
2. Fast Throughput.
The AD7654 is a 500 kSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
3. Superior INL and No Missing Codes.
The AD7654 has a maximum integral nonlinearity of
3.5 LSB with no missing 16-bit codes.
4. Single-Supply Operation.
The AD7654 operates from a single 5 V supply. In impulse
mode, its power dissipation decreases with throughput.
5. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangement is
compatible with both 3 V and 5 V logic.
Rev. B
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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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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