AD7655_15 Datasheet, PDF (1/27 Pages) Analog Devices – Low Cost, 4-Channel, 16-Bit, 1 MSPS PulSAR ADC

Data Sheet
FEATURES
4-channel, 16-bit resolution ADC
2 track-and-hold amplifiers
Throughput
1 MSPS (normal mode)
888 kSPS (impulse mode)
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 at 10 kSPS
Package
48-lead quad flat package (LQFP)
48-lead frame chip scale package (LFCSP)
Pin-to-pin compatible with the AD7654
Low cost
APPLICATIONS
AC motor control
3-phase power control
4-channel data acquisition
Uninterrupted power supplies
Communications
GENERAL DESCRIPTION
The AD7655 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.
Low Cost, 4-Channel,
16-Bit, 1 MSPS PulSAR ADC
AD7655
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REFGND REFx
DVDD DGND
INA1
INAN
INA2
A0
INB1
INBN
INB2
PD
RESET
TRACK/HOLD
×2
MUX
MUX ^SWITCHED
CAP DAC
MUX
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
AD7655
SERIAL
PORT ₁₆
PARALLEL
INTERFACE
OVDD
OGND
D[15:0]
SER/PAR
EOC
BUSY
CS
RD
A/B
BYTESWAP
IMPULSE
CNVST
Figure 1.
Table 1. PulSAR® Selection
Type/kSPS
Pseudo Differential
100 to 250
AD7660/
AD7661
True Bipolar
True Differential
18 Bit
Multichannel/
Simultaneous
AD7663
AD7675
AD7678
500 to 570
AD7650/
AD7652
AD7664/
AD7666
AD7665
AD7676
AD7679
AD7654
800 to
1000
AD7653
AD7667
AD7671
AD7677
AD7674
AD7655
>1000
AD7621
AD7623
AD7641
PRODUCT HIGHLIGHTS
1. Multichannel ADC.
The AD7655 features 4-channel inputs with two
sample-and-hold circuits that allow simultaneous sampling.
2. Fast Throughput.
The AD7655 is a 1 MSPS, charge redistribution, 16-bit SAR
ADC with internal error correction circuitry.
3. Single-Supply Operation.
The AD7655 operates from a single 5 V supply. In impulse
mode, its power dissipation decreases with throughput.
4. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangements
are compatible with both 3 V and 5 V logic.
Rev. C
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